Buy a cnc grinding machine | Travel, Table Load, Factory Service

Suggest investigate factory after-sales (48h response), trial grind sample piece, and confirm spindle rotation speed and cooling filtration configuration.

Travel

Definition & Parameter

We take common CNC surface grinding machine make an example, XYZ three directions' moving range entirely relies on bottom's real cast iron dimension to support up.

X-axis manages is worktable left right back forth running's distance, machine two ends' hydraulic buffer puts limit position fixed dead. Instruction manual on writes working interval is 600 millimeters, you toward worktable bottom one look, V-type guide rail's actual length at least must have 1100 to 1200 millimeters.

Make machine's person must guarantee slider runs to most edge time bottom still has enough iron supporting. Guide rail suspending at outside's part exceeds table surface total length's 15%, worktable at two ends then will toward down drop, produces 0.002 millimeters above's tiny deformation. You look X-axis's parameter, must calculate calculate base that piece iron exactly has how long.

· Saddle suspending at outside's length: cannot exceed guide rail total length's 12%

· Anti-collision block left's gap: two sides must respectively empty out 20 to 25 millimeters' hard buffer zone

· Reading position's optical linear scale: effective measuring section must compared to mechanical maximum moving distance more out 50 millimeters

· Screw rod pitch matching: 10 millimeters' pitch exactly can let X-axis run out per minute 30 meters' highest speed

Manages front back moving's Y-axis, its real physical moving distance with spindle motor's suspending length dead-dead tied at together. Set Y-axis can run 400 millimeters, column inside's saddle moving slider then must day day carrying grinding wheel motor approximately 150 to 200 kilograms' eccentric weight.

Slider full field running's time, transverse feeding's roller linear guide rail pre-loading level generally adjusted to Z3 level, specially used to top hold 0.5 micrometer level's deflection. Machine tool cutting inside processing time, Y-axis whole journey's movement straightness is by dead command pressed in 0.003 millimeters/300 millimeters' error inside.

Z-axis's parameter most easily deceives people, specification sheet on writes Z-axis travel 450 millimeters, really not represents you can stuff inside a 450 millimeters high's part. Equipped on a piece outer diameter 350 millimeters' WA white corundum grinding wheel, Z-axis's usable space immediately loses 175 millimeters.

Spindle flange plate's thickness needs to occupy away almost 45 millimeters, machine tool most bottom equipped's permanent magnet chuck again must occupy away at least 90 to 110 millimeters' height. Originally thought 450 millimeters quite spacious, deducted away these iron lumps' volume, left to part's vertical processing height at most remains 120 millimeters a little over.

· Grinding wheel maximum outer diameter consumption: eats away 100 to 200 millimeters' vertical clearance

· Diamond dresser base: fixed at table surface on needs to occupy away 60 to 80 millimeters

· Spindle flange outside's protective cover: bottom end toward down extra stretches out 40 to 50 millimeters

· Standard configured's electromagnetic worktable: thickness basically at 90 to 130 millimeters between floats

Multi-axis CNC tool grinding machine this side, travel's measuring standard from walking straight line's millimeters turned into turning circle's angle. Responsible for indexing rotation's A-axis or C-axis can 360 degrees infinitely spin, hard indicator is every time rotating's indexing error must stuck at positive negative 3 arc seconds within.

B-axis bringing grinding head does swinging angle processing, active range stuck at negative 15 degrees to positive 225 degrees between. Swinging angle motor inside equipped's absolute value encoder resolution reaches 26 bits, guarantees at whole rotating interval inside, position feedback's step angle fined down to 0.0001 degrees.

Heavy-duty machine tool's parameter extremely easily by workshop inside's temperature fluctuation brought deviated. HT300 cast iron bed body every elevates 1 degree Celsius, every meter then will expand 10 micrometers. A X-axis length reaches 2000 millimeters' heavy-duty gantry grinding machine beside, room temperature up down fluctuated 3 degrees Celsius.

Whole root bed body at X-axis direction then will forcefully pull long nearly 0.06 millimeters. High-end machine tool in order to press hold this kind deformation, instruction manual inside will clearly mark equipped hollow ball screw. Constant temperature 22 degrees Celsius' cooling oil according to per minute 15 liters' flow rate from screw rod belly inside threads past, puts long span under's thermal deformation forcefully pressed hold.

· Full closed-loop optical linear scale: can read out 0.05 micrometers even 0.01 micrometers' change

· Screw rod cooling liquid temperature control: running temperature difference fixed dead at positive negative 0.5 degrees Celsius inside

· Guide rail lubricating oil film: maintains at 2 micrometers to 5 micrometers' dynamic pressure roaming state

· Workshop allowed's temperature difference: 24 hours inside up down change cannot exceed 2 degrees Celsius

CNC system gave movement boundary put on three layers insurance. Soft limit is written at PLC control program inside's digital coordinate, generally set at leaving mechanical end still has 5 millimeters' place.

Switch by bumped into, servo motor will at 0.1 seconds within emergency brake holds dead. Most edge on's physical dead zone is a piece 30 millimeters thick's polyurethane buffer rubber block and cast iron baffle plate. Suppose worktable pulling 2000 kilograms' heavy object according to per minute 20 meters' speed loses control rushes past.

Travel Selection

A copy long 400 millimeters' shaft class part drawing, purchasing often will stare at nominal X-axis 500 millimeters' equipment looks. Puts processing piece two ends used to clamping's center calculated inside, space instantly stretches to the limit.

Machine tool spindle chuck fixed at left side, occupies away approximately 120 millimeters' transverse space. Right side that carrying Morse No. 4 taper's tailstock, in order to provide enough top tightening force, base at least must occupy away 150 millimeters. 400 millimeters' part adds on two ends 270 millimeters' fixture, X-axis without a 800 millimeters fundamentally puts not inside.

Choosing X-axis travel still must calculate on grinding wheel two ends running empty's distance. Surface grinding time, grinding wheel must completely detach workpiece surface again changes direction, otherwise part two ends all are by cut broken's collapsed corners. Diameter 300 millimeters' grinding wheel, two sides at least respectively need to leave out 25 millimeters' safe changing direction running empty distance.

Y-axis selection hides grinding wheel dressing's hidden consumption. Many factories buy machine only look part width, forgot diamond dressing pen must fixed at worktable's one side. A standard dressing base wide 45 millimeters, equipped at table surface on with processing part side by side stays.

Grinding wheel every ground finished few tools, then must move past let diamond pen scrape away surface 0.02 millimeters' passivation layer. Y-axis if not gave this 45 millimeters leave out running distance, spindle fundamentally reaches not to dressing pen. Calculated on part widest place 200 millimeters, Y-axis travel fixed at 300 millimeters just considers passing.

· Diamond roller dresser: base width usually occupies worktable right side 65 to 80 millimeters

· Stepped shaft grinding yielding position: measuring gauge probe advance retreat needs independently pre-leave 40 millimeters' Y-axis space

· Multi-groove piece processing jumping: grinding wheel at different grooves between jumping time's avoiding empty displacement cannot lower than 15 millimeters

Z-axis selection needs to toward grinding wheel's loss heart inside has number. Just equipped on's brand new ceramic binder grinding wheel outer diameter can have 400 millimeters. Day day grinding adds on back forth dressing, this grinding wheel finally will by ground to only remaining 250 millimeters' scrap red line.

Radius shrunk 75 millimeters, spindle then must toward down extra drops 75 millimeters just can touch to table surface on's part. Buy nominal Z-axis 450 millimeters' machine, in order to adapt grinding wheel getting small, at least must pre-leave 100 millimeters' downward probing allowance, otherwise grinding wheel used to half then reaches not to workpiece.

A X-axis travel 800 millimeters' medium type machine tool, floor area approximately at 5.5 square meters. Puts travel enlarged to 1500 millimeters, machine tool base must lengthen, outside's cooling liquid water tank also must follow double enlarge.

Floor area will fiercely increase to 12 square meters up down. Workshop inside's forklift channel must leave out lowest 2.5 meters' width, large travel machine toward inside one put, surroundings' logistics moving lines all must re-arrange. Workshop floor's load bearing also must from per square meter 2 tons toward up lift, shockproof trench must dig deep to 400 millimeters.

Travel every toward up lifts one gear, buy machine's money all are jumping rising. X-axis from 800 millimeters upgraded to 1000 millimeters, inside that root ball screw's diameter must from 32 millimeters changed into 40 millimeters. Guide rail's load bearing slider must from every side two increased to three.

Cast iron bed body internal needs to extra add four paths thickness 30 millimeters' reinforcing ribs. Extra spent out's machine tool purchasing fee approximately at 15% to 20% between. Ordinarily received's works total length not exceeds 300 millimeters, in order to occasionally one two orders large piece go buy large machine, every month handed's electricity fee all collects not back cost.

Large travel machine's servo motor power all are toward up doubling selected. 800 millimeters travel's machine equipped a 1.5 kilowatts' X-axis motor then pulls moving, changed to 1500 millimeters travel, at least must up 3 kilowatts' motor. Every day open machine runs on ten hours, one month down electricity meter word number gap quite obvious.

Buy equipment time take a ordinarily often done's 250 millimeters long part go to factory actual measure. Puts part placed to table surface on clamped tight, equipped on standard configured's outer diameter 350 millimeters brand new grinding wheel. Operation panel on puts three axes shaken to two ends furthest's place, measure one measure slide plate leaves surroundings sheet metal outer shell still remains several millimeters.

Cutting liquid nozzle pipe's walking position also must stare looking. Travel walks to furthest end's time, water pipe if by pulled too straight, machine doing work half way then easily tears broken connector. Water pipe left's rich length at least must compared to each axis maximum travel more out 150 millimeters, following spindle full field running just can not receive limitation.

· Cooling liquid plastic soft pipe: must satisfy full travel moving under maintains 20%'s natural bending degree

· Cable drag chain internal space: arranged full various types cables after, upper direction needs to pre-leave at least 10 millimeters' active gap

· Sheet metal telescoping protective cover: completely pulled open after every section steel plate needs to maintain 8 to 12 millimeters' mutual overlapping amount

Chip discharging groove's metal slope must follow machine tool length together changes. A X-axis 2000 millimeters' machine, right side comes out's iron chips and grinding wheel ash need to follow water flow flushed to left side's filter paper belt on. Bottom's water sink if not has a 5 degrees' tilting angle, these sediments all must pasted at half way on.

Flushing water pump's pressure must buy high lift type. Per minute 60 liters water flow rate's pump, puts cooling liquid hit to 2 meters away's spindle head on, pipeline inside's pressure loss nearly 30%. Guarantees sprayed to grinding point on's water flow still has 2 kilograms' flushing pressure, water pump motor nameplate on must writes 1.1 kilowatts.

Technology & Cost

Originally X-axis 600 millimeters' machine, bed body uses two tons heavy's HT300 cast iron can press hold vibration. Changed into 1500 millimeters travel, base weight immediately soaringly rises to five tons half.

Extra comes out's three tons half pig iron is not according to scrap iron price calculated. Casting factory needs to at base inside distribute full honeycomb shape's reinforcing ribs, every piece rib plate thickness reaches 40 millimeters. Wood mold's opening mold fee and resin sand casting's artificial fee, let machine tool leaving factory price toward up jumps 25%.

Large travel machine's guide rails all changed into heavy-load type. Short travel uses width 35 millimeters' roller linear guide rail can make do, running up 1500 millimeters' travel, must change on 55 millimeters wide's large guide rail. Slider inside's roller diameter from 6 millimeters enlarged to 10 millimeters, load bearing capability doubled three times.

· Linear guide rail purchasing unit price: 55 millimeters specification every meter selling price high out 35 millimeters specification nearly 1800 yuan

· Screw rod supporting bearing: two ends configured P4 level's double row angular contact bearing, one set expenses 4500 yuan

· Automatic lubricating system: oil tank capacity from 2 liters altered into 4 liters, hitting oil interval from 40 minutes shortened to 25 minutes

Ball screw's span becomes long, middle part at own gravity under toward down drops. A root long two meters, diameter 40 millimeters' screw rod, two ends pulled again tight, middle will have 0.015 millimeters' natural drooping. Screw rod one bends, motor turning up like flinging a root jump rope.

Assembling master at screw rod two ends' nut inside pours inside carrying pressure's lubricating oil. Two kilowatts' oil chiller at beside boom boom making sound, puts cooling oil's temperature dead-dead pressed at 22 degrees.

Screw rod hollow cooling system whole set manufacturing price nearly three tens of thousands yuan. That machine two kilowatts' oil chiller as long as machine connects electricity, one day 24 hours all are consuming electricity, one month bill on more out three hundred more degrees electricity.

Servo motor's power and price following travel water rises boat high. Pulling one ton heavy's worktable at 800 millimeters' range inside runs, equipped a 15 Newton meters' motor enough to use. Travel pulled to 1500 millimeters, motor torque changed into 30 Newton meters' model.

· Drive ampere number matching: 30 Newton meters motor needs to configure 45 amperes' large power drive

· Power cable wire diameter thickened: copper core cross-sectional area from 2.5 square millimeters enlarged to 4 square millimeters

· Electricity consumption amount data climbing: one day works full ten hours, large motor extra consumes ten more degrees electricity

Long travel processing state under, optical linear scale every second transmits back's position data multiple reaches two million times. Ordinary PLC chip processing massive data happens stuck shell, factory changes equipped carrying nanometer level interpolation function's processor.

Puts long travel's huge monster transports back factory building, logistics and foundation's bills placed at eyes front. Thirteen meters long's semi-trailer freight fee one kilometer asks price twelve yuan money. Workshop originally 15 centimeters thick's cement ground carries not hold eight tons heavy's iron lump.

Smash away old floor, toward down dig out 600 millimeters deep's big pit. Newly tie on 16 millimeters thick's threaded steel bar, pour inside eight cubic meters' C40 standard commercial concrete, hit foundation spends away two tens of thousands more yuan.

Daily maintenance's expense amount large amplitude rises. Guide rail long, dustproof accordion cover's fold number becomes many, a piece three meters long's accordion cover inside has eighty more folding blades. Every day at cooling liquid inside soaking, not reaches two years whole set six thousand yuan's protective cover faces changing new.

Table Load

Real Total Weight

A machine marked 500mm×1000mm dimension's surface grinding machine, iron sheet nameplate on engraved's load bearing upper limit calibrated as 500kg. Toward table surface puts a piece heavy 450kg's square steel plate opens machine starts, machine behind's servo motor will emit muffled's alarm sound. Machine brings not moving 450kg's load, starting cause is buy machine time less calculated electromagnetic chuck's own weight.

Used to fixing steel plate's electromagnetic chuck occupies extremely big's weight share, internal stuffed full one circle circle pure copper wire coil, copper's specific gravity reaches 8.96 g/cm³. Outer shell in order to prevent magnetic force outward leaking, wrapped on thickness exceeding 18mm's low carbon steel plate. A 500mm×1000mm's ordinary chuck, net weight maintains at 280kg to 320kg between.

Uses leaving factory marked's 500kg deducts away 320kg chuck, left to square steel plate's weight balance less than 200kg. Some small processing factories in order to dispatch goods saves freight fee, puts copper wire coil changed into specific gravity only has 2.7 g/cm³'s aluminum wire. Calculates down can at account surface on clear out 45kg's load bearing quota.

Aluminum wire coil passes electricity sucks not enough tight, spindle continuously turns 4 hours, suction power drops 15%. Grinding wheel touches on going cuts, steel plate easily appears 3 to 5 micrometers' displacement. Grinding 15 degrees to 30 degrees oblique angle's automobile mold, must toward chuck on add equip a pile auxiliary fixing tools.

· Precision sine magnetic table: net weight 45kg

· Steel made flat mouth vise: net weight 18kg

· Custom-made hydraulic mandrel: net weight 22kg

· V-type cast iron block: single piece 8kg

Measure a piece 400mm×400mm×200mm's P20 mold steel, according to iron steel specific gravity 7.85g/cm³ convert, weight reaches 251.2kg. Adds on 300kg's large chuck and 45kg's sine magnetic table, table surface bears' physical total weight climbs to 596.2kg. Exceeds machine upper limit almost 20%, whole machine's pig iron base by pressed extremely strenuous.

Machine tool sprays out's cooling water will increase real hitting real's weight. Often used's semi-synthetic cutting liquid, specific gravity maintains at 1.05g/cm³. Mold upper face has a 15 liters' concave groove, water fills full after more out 15.7kg's dead weight. Grinding carrying 40 cooling holes' deep cavity piece, holes inside accumulated water more out 8kg.

600 more kilograms' iron block connecting with storing water, at worktable on uses 18m/min's speed back forth slides. Runs to two ends needs to change direction, hydraulic valve needs at extremely short's 0.2 seconds within puts huge heavy object brakes stopping, reverse direction pushes back going.

· Servo motor instant current: exceeds 25A

· Screw rod bears pulling stretching force: exceeds 4500N

· Guide rail oil film oppressing thickness: not reaches 8μm

· Bed body casting local sinking: 0.005mm

Machine tool bottom's supplying oil pump leaving factory time pressure fixed at 1.5 MPa to 2.0 MPa between. Serious over weighting puts ten several micrometers thick's oil film thoroughly squeezed broken, turns into pig iron rubbing pig iron's dry grinding. Worktable bottom's resin plate very fast appears scratching marks, flatness tolerance runs out 0.002mm outside.

Sky on presses down comes' grinding wheel needs to calculate inside total weight inside. Diameter 400mm's grinding wheel uses 1450 rpm rotation speed toward down presses, every time eating tool 0.02mm, forcefully presses out a strand extremely big's force. Grinding hardness HRC60 above's quenched steel, toward down's pressure data fiercely increases 40%.

Machine day day carrying excess heavy object doing work, iron piece's wearing loss compensates not back coming. Every day opening machine 8 hours continuously doing half year, Z-axis screw rod's gap becomes big 0.008mm. Motor connecting piece's rigidity drops 12%, spindle inside's bearing position deviates out 0.003mm.

Worktable below's V-type guide rail wear-resisting plate, single side ground away 0.015mm above. Screen on knocks down 0.001mm's entering tool instruction, will be worn out coming's mechanical gap entirely eaten away. Uses tape measure measures good iron block dimension, uses electronic scale passes one time all screws fixtures.

Adds on concave groove inside storing's water weight, calculated on grinding wheel toward down pressing's force, all numbers added complete compose evaluating equipment's real basis. Leaves out 20%'s weight empty margin, servo motor's strength just enough to use. Motor temperature maintains at 45 degrees below, spindle walks to 0.001mm's position not will appear mechanical stuttering.

Stop vs Running

Puts 500kg's iron block stably stopped placed at grinding machine table surface on not moving, merely is toward bottom HT300 inoculated cast iron bed body conducted a match light weight level's static force test. Room temperature 22 degrees environment under, gravity vertically toward down transmits, base casting's microscopic deformation often even 0.002mm all not reaches. Machine not plugs electricity statically placed time, worktable loading's weight performs extremely docile.

Presses down green color starting button after, several hundreds kilograms' pig iron instantly turns into huge's destruction source. Worktable bringing totally 580kg's heavy object, uses 25m/min's speed at X-axis direction wildly runs. According to mechanical parameter measures kinetic energy, high speed moving brought's inertia energy fiercely rises dozens of times.

Runs to travel two ends, heavy object must at 0.15 seconds within thoroughly brakes stopping turning head. Originally law-abiding's 580kg static weight, at changing direction instant excites out exceeding 8000N's horizontal direction impact force. Bottom supporting's roller guide rail and M30 specification's ball screw, must forcefully carry down this strand huge's tearing force.

Machine stopping at original place time, guide rail surface covers a layer thickness roughly 15μm's ISO VG68 lubricating oil film. 580kg's heavy object flat presses at upper face, oil film at most by squeezed to 12μm thick. Metal parts middle separated by oil layer, sliding friction coefficient stably stays at 0.03 around.

Machine full speed runs up after, oil film's situation happens sharply deteriorating. Worktable back forth rolling pressing, superimposing grinding wheel using 2800 turns/minute high speed cutting brought's mechanical vibration, guide rail bearing's local pressure fiercely increases to 4.5 MPa above. 15μm thick's oil film by instantly rolled smashed, thickness drops breaking 3μm's critical value.

Lubricating layer breaks, worktable bottom's wear-resisting resin plate completely without blocking sticks at pig iron guide rail on dry grinds. Machine full speed doing work not reaches 20 minutes, friction area's temperature fiercely climbs to 48 degrees above. Thermal expansion cold contraction phenomenon puts length reaching 1200mm's screw rod quietly pulled long 0.012mm.

Grinding wheel contacts workpiece's instant, extra comes out a strand complex's running cutting force. Cutting depth set at 0.015mm time, diameter 350mm's white corundum grinding wheel produces out roughly 400N's toward down positive pressure. Beside extra comes out a strand 150N's horizontal toward backward pushing force, forcefully puts workpiece toward outside tears.

Spindle motor outputs 7.5kW's power confronts cutting resistance, machine tool spindle box excites out reaching high 80Hz's high frequency resonance. This strand vibration follows cast iron column transmits to loading 580kg heavy object's worktable. Pig iron block on's all metal molecules all are bearing every second 80 times' microscopic shaking.

Machine stopping machine hitting dial indicator measures out's 0.002mm flatness, at running working condition middle turns into a piece waste paper. Spindle rotating and table surface wildly running brought's mechanical shaking, puts stopping machine calibrating's precision numerical values entirely swallows.

Table inside's numerical values clearly show, machine runs up facing's mechanical heavy pressure far compared to stopping big much. Operator at cutting electricity stopping machine time hits indicator, reading shows surface tolerance perfectly stuck at 0.002mm inside. Grinding wheel one rotates cuts, measured out's dimension always big out 0.006mm to 0.01mm. Pig iron's microscopic deformation at opening machine doing work time by infinitely magnified.

Many old machine repairing workers early then understand static load bearing numbers rely not stable. Confronting 500 kilograms iron block using extremely fast speed moving brought's destruction, needs from mechanical hardware level makes prevention. Old hands at workshop assembling and debugging equipment time, will deliberately arrange several items hard adjustments.

· Puts guide rail injecting oil pump's hitting oil frequency, from original factory set's every 40 minutes one time forcefully altered into every 15 minutes one time.

· Gives X-axis direction's ball screw adds on 300 kilograms' pre pulling stretching strength, used to offset friction producing heat brought's metal elongating.

· Puts cutting water pump's nozzle output pressure adjusted high to 2.5 bar, uses massive cold water forcefully brings away table surface friction area's heat.

· Change uses higher label's ISO VG68 guide rail oil, increases oil film at 4.8 MPa high pressure heavy load under's anti squeezing toughness.

Stopping at original place not moving and running up high speed doing work, machine tool chassis bearing's mechanical torture completely is not one magnitude. Calculated accurate not connecting electricity time table surface on's iron lump has how heavy, only handled proper machine buying before 10%'s preparing task. Remaining 90%'s effort, all at pre-estimating these several hundreds kilograms heavy object using 20m/min speed wildly running time produced's destruction force.

75%-80% Load Bearing Redundancy

Nameplate on printed 500kg's highest bearing limit, toward table surface on piled full 490kg's iron blocks go run machine tool, is many workshop operators figure saving trouble often doing's matter. Puts machine forced to mechanical bearing's extreme value, whole set transmitting system's lifespan will use naked eye visible's speed toward down drop. Buy machine according to 75% to 80%'s load bearing upper limit go leave richness, is old repairing machine master buying equipment time thunder hits not moving's rule.

Leaves out 20% above's weight space, most first kept is servo motor's usage lifespan. 500kg load bearing's grinding machine, leaving factory standard configured torque is 15N·m's AC servo motor. Hanged full 500kg heavy object runs, motor rotor needs to release nearly 100%'s rated power, worktable just can reluctantly run to 18m/min's speed.

Motor long term full load holding strength exerting force, expressed at outside's change concentrates at machine shell exterior's temperature data on.

Full load 490kg runs 3 hours, servo motor outer shell temperature will soaringly rise to 55 degrees, internal wire coil's insulation layer starts accelerating aging.
Reducing weight to 380kg runs same's time, motor outer shell temperature stably stays at 38 degrees up down, fan dissipating heat completely follows on.

Dropping temperature can let photoelectric encoder's glass code disk maintains at 22 degrees' original benchmark state. Table surface weight stuck at 380kg within, motor outputs 12A's smooth current, easily puts worktable pushed to set's position. Screen on inputs 0.002mm's entering tool instruction, tool accurately precisely moves 0.002mm.

Following motor toward inside look, pushing pulling worktable's ball screw is second piece eating weight's big piece. Calibrated 500kg load bearing's machine, X-axis mostly configured has diameter 40mm, lead 10mm's C3 level ground screw rod. Screw rod nut inside stuffed full diameter 3.175mm's chrome steel balls, responsible puts rotating's strength altered into linear pushing force.

According to 80%'s extreme standard ruler sticks weight, these several hundreds pieces small steel balls bearing's squeezing force exactly falls at safe zone.

· Full load 500kg changing direction time, single piece ball bearing's instant shearing force exceeds 280N, steel ball surface extremely easily appears tiny's peeling pits.

· Weight drops to 375kg, shearing force suddenly drops to 190N within, screw rod runs up two years still can maintain 0.003mm within's mechanical gap.

Heavy's table surface presses at guide rail on, weight differs out 100 kilograms, bottom's lubricating oil film faces entirely different's surviving state. Machine tool base excavated V-type and rectangular mixing guide rail, surface pasting thickness as 1.5mm's wear-resisting resin plate. Gear pump uses 2.5 bar's pressure, every separating 15 minutes toward guide rail gap inside injects one time 68 number guide rail oil.

Puts iron block adds on fixture's total weight controlled at 400kg, oil pump hits inside's lubricating oil can stably support up 12μm thick's oil film. Worktable at oil film on sliding, friction coefficient extremely low. Total weight approaches nameplate on's 500kg numerical value, base casting's local pressure breaks through limit, oil film by squeezed to thinner than 4μm.

Resin plate connecting with pig iron bed body between loses oil layer protection, every day opening machine 8 hours rubbing sliding friction.

Maintains heavy load ratio at 75%'s machine, guide rail resin plate three years measures one time wear loss, thickness reducing loss not reaches 0.02mm. Day day sticking 100% full load doing work's equipment, not reaches 8 months resin plate then by rubbed away 0.08mm, table surface two ends appears downward drooping deformation.

Box body inside assembled 4 pieces P4 level's angular contact ball bearings, relying on lubricating grease at 2800 rpm's rotation speed under biting. Table surface weight more approaching limit, grinding wheel cutting time produced's reverse vibration transmits back spindle's amplitude more big.

Unloads away 120kg's bearing pressure weight, machine tool cast iron column absorbs vibration's ability extra comes out a big section. Heavy object pressing 380kg, cutting produced's continuous fast shaking follows bed body toward up transmits, at arriving spindle box before then by HT300 material's pig iron block eats away 70%. Spindle front end measures out's jumping error, continuously doing several months all honestly stay at 0.0015mm inside.

Old workshop inside uses ten years still can receive high precision mold work's old machine tool, finds not out day day full load squeezing running's days. Operator receiving order before will carefully take calculator puts iron material, flat mouth vise, big chuck's numbers one by one presses out mutually adds. Calculates down exceeds original factory load bearing upper limit 80%'s processing piece, rather extra spends effort dismantles into two times small allowance to grind.

Bumping on single piece part heavy 250 kilograms' work, equipped on 200 kilograms' big dimension chuck, adding up real hitting real has 450 kilograms heavy. Facing iron plate on marked 500kg load bearing's machine, old master even looking all will not extra look one eye. They will choose that machine calibrated load bearing at 600kg above's big dimension equipment go take hands doing this batch goods.

Factory Service

Installation & Commissioning

Machine tool sent into workshop before, ground's cement foundation early then aired 28 days. This pit dug 800 millimeters deep, filled full high strength's C50 grouting material. Pit four surroundings specially left 20 millimeters wide's gap, stuffed full polyurethane foam, beside punching machine how vibrates, this machine tool all feels not arriving.

Room roof's 15 tons crane slowly drops down, master takes four roots can bear 10 tons pulling force's soft lifting belts, stably hangs at base on. Absolutely cannot use hard stiff's steel wire rope hard tears, slightly tilted one bit, this iron lump base then will at microscopic produces deformation.

Machine stably falls ground, real's fine tuning just starts. Workshop air conditioning opened to 20°C, doors windows closed tight, lets machine tool peacefully quietly stays on 24 hours. It at road on blows wind receives cold receives heat, cast iron every one degree has 12 micrometers' expanding shrinking, must let it slowly slows over strength coming.

Engineer takes out a piece Swiss Wyler electronic level, this plaything can measure out every meter 0.001 millimeters' tilting. Machine tool below 12 pieces iron pad blocks receiving force not same, master holding torque wrench, diagonal line one by one twists screws finding flat.

Adjusting flat's requirement extremely strict:

· X-axis guide rail face's twisting degree not reaches 0.005 millimeters/meter

· Z-axis walking's straight line error smaller than 0.003 millimeters/meter

· Every piece pad iron receiving force's difference not exceeds 50 Newton·meters

· Placed half day again measures, changing amount lower than 0.002 millimeters/meter

Level's numbers stuck at ±2 micrometers within, wrench this just stores up. Connecting electricity before, gives hydraulic station pours inside 300 liters ISO VG 46 model's anti-wear oil. Water tank inside adds full 500 liters cooling liquid, master takes refractometer measures three times, guarantees concentration exactly at 8% to 10% between.

Factory inside's electrical wires connects to electric cabinet before, multimeter measures out voltage is 380V, fluctuation not reaches 2V. A root copper strip smashed into ground down 2 meters deep acts as grounding wire, measures out coming resistance only has 1.2 ohms. Those mixed seven mixed eight's electrical waves, fundamentally interferes not to CNC system's pulse signal.

Supplying gas pipe connecting on machine tool before first looked one eye gas pressure gauge. Pipe inside gas pressure stable at 0.6 Megapascals, cold dryer puts air inside's water content freezes to 3°C discharges out. Gas cylinder controls' safe door continuously opens closes 50 times, one time all not stuck shell.

First time rotating spindle must one step step comes. Rotation speed gauge first fixed at 500 turns/minute, dry turning half hour. Master holding infrared ray measuring temperature gauge toward spindle front face shines, looking at temperature slowly climbs to 32°C then stops.

Continuing accelerates to 1500 turns, finally pulled to highest's 3000 turns. Every time lifting speed all pastes on small box same's measuring vibration gauge, screen on's vibration speed continuously stable at 0.4 millimeters/second below, compared to national standard requires' 1.12 millimeters/second smooth much.

Measuring space geometry's time, worktable on placed a piece 00 level precision's Jinan Green marble flat ruler. Dial indicator's probe tops against ruler side face, worktable uses per minute 500 millimeters' speed back forth runs.

Master circling machine finding correct these details:

· X-axis and Z-axis cross intersecting's perpendicularity

· Spindle turning up time's radial jumping amount

· Tailstock center and spindle's coaxial error

· Screw rod turns one circle's error difference value

· Motor forward reverse turning time's gap data

Renishaw XL-80 laser instrument framed at tripod on, light beam hits at Z-axis center. Beside's environment box one second measures dozens times air temperature and gas pressure, puts refracting's light ray error smoothed flat. Z-axis at 1000 millimeters' distance inside set 20 pieces stopping points.

Machine walks few steps stops one time, laser measures out coming's actual position and computer wants to walk's position one one compares. Servo system's error at screen on draws out wave line. Master puts computer calculated out's compensating data, plugs on internet wire transmits into FANUC 31i-B system inside.

Compensating data writes inside after again runs one time. Laser instrument shows, Z-axis finding position's error from 12 micrometers shrunk to 2.5 micrometers, repeating positioning can stuck at 1.5 micrometers. Closely following starts gives grinding wheel does dynamic balancing test.

Diameter 400 millimeters, thick 50 millimeters' white corundum grinding wheel equipped at flange plate on, framed at SBS dynamic balancing instrument inside. Sensor staring grinding wheel rotating time's tiny deviating. Counterweight's small iron block at groove inside moves several millimeters, screen on's remaining unbalance amount numerical value then follows jumps.

Master endures temper adjusted four times, vibration amplitude drops to 0.02 micrometers. This time cuts a piece Gcr15 bearing steel tests water, surface roughness measures out coming is Ra 0.15 micrometers. Hydraulic tailstock set's top tightening force is 2.5 Megapascals, expanding shrinking action crisp neat.

Dressing grinding wheel's diamond pen tip stops at leaving surface 0.5 millimeters' place, acoustic emission sensor captures contacting instant's high frequency sound. One hears movement immediately sends signal, dressing program according to every time 0.01 millimeters entering tool amount, every turn 0.2 millimeters' speed scrapes away surface layer.

Operator & Process Training

Machine tool connects electricity measures finished precision, original factory trainer Old Li pulls workshop's operator stands to screen front. This machine equipment configured is 15 inches' FANUC 31i-B touch panel, densely densely distributed 8 pieces main menus and 45 pieces sub pages. Master requires worker forgets hand shaking big flywheel's habit, must use 0.001 millimeters as unit go think.

First hall class from loading clamping a root 300 millimeters long's 45 number steel shaft starts. Hydraulic chuck's pressure gauge pointer stays at 1.5 Megapascals, extra gives 0.5 Megapascals, part middle will bulge up 0.02 millimeters' tiny bending. Less gives one bit, spindle runs to 1000 turns/minute time, dozens catties' iron lump will fly out comes smashes through protective door.

Drawing on's high speed steel part hardness reaches HRC 62, ordinary's silicon carbide grinding wheel touches on going only will straight emit sparks. Old Li from wooden box inside moves out ceramic binder's CBN grinding wheel, puts spindle's linear speed fiercely pushes to 80 meters/second.

Grinding wheel rotation speed follows on just cuts moving hard bone, dressing parameter's setting extremely tests effort. Diamond roller's rotation speed set as grinding wheel rotation speed's 0.8 times, two sides follows same one direction turns. Rotation speed difference produced's cutting force exactly can puts CBN abrasive outer layer's binder peels off 2 to 3 micrometers.

Dressing's overlapping rate is fixed dead at 0.3 millimeters/turn. Dresser walks fast, grinding wheel surface will like thread same bumpy bumpy; walks slow, grinding wheel will by ground like mirror face same slipping. At this parameter under, grinding wheel can eat tool, can put workpiece surface roughness controlled at Ra 0.4 micrometers.

Many new hands open machine then forget's cooling liquid, at original factory actual operation inside is one door heavy head play. Old Li extends hand puts 3D printed's titanium alloy nozzle toward down presses 15 degrees, exactly aligns grinding wheel and part biting's that root line. Cooling pump's frequency converter frequency pulled high, water pressure gauge tops to 20 Bar, flow rate reaches per minute 80 liters.

Grinding area originally soaringly rising to 800°C's high temperature, at few milliseconds within by forcedly pulled low to 120°C below. Part surface easily appears' emitting yellow emitting blue burning marks, forcefully by physical water pressure suppressed.

Operator must look understand machine tool temper. Master points at screen on's spindle load gauge, empty turning time stays at 15%. When grinding wheel cuts into steel material, load jumps to 35% above stays high not drops, operator hurriedly puts feeding speed from 0.5 millimeters/minute drops down coming, or calls automatic dressing.

Gives worker builds hand feeling standard, Old Li puts grinding process dismantles into five pieces dead ruled actions:

· Fast approaching: every minute walks 10000 millimeters, at leaving part surface only remaining 1 millimeters' place suddenly brakes.

· Rough grinding removes meat: leaves out 0.1 millimeters' allowance, grinding wheel every turns one circle eats away 0.05 millimeters' iron chips.

· Semi fine grinding finds shape: allowance remains 0.02 millimeters time, feeding speed broken cliff style falls to every circle 0.005 millimeters.

· Fine grinding protects dimension: remaining 5 micrometers' meat, only can use every circle 0.001 millimeters' turtle speed one bit bit rubs away.

· Light grinding removes tool marks: feeding stays at 0, lets grinding wheel at original position dry rubs 3 to 5 circles, smooths flat high low difference.

Morning 8 o'clock opens machine, operator's first piece matter is calls out pre-heating program. Spindle uses 1500 turns/minute's speed runs on 15 minutes, lets two ends' hydrostatic bearing temperature evenly climbs stably at 35°C. Y-axis screw rod back forth running 20 times, puts lubricating oil inside's air bubbles entirely squeezes out going.

This set standardized actions can put morning first piece and afternoon last piece's dimension error, dead dead bites at 0.003 millimeters' tolerance band inside.

Old Li hand holding hand teaches worker listens sound distinguishes grinding wheel's state. Just dressed finished's CBN grinding wheel cutting steel material time, emits out is 1200 Hertz around crisp's high frequency screaming. Sound emits muffled, carries low frequency's booming sound, operator must conditioned reflex like presses down operation panel on's pause key.

Different material's workpiece at operating habit on entirely not same. Grinding powder metallurgy gear time, porous structure easily stuffs full grinding wheel pores. Operator is required every grinds 50 pieces parts, must starts one time high pressure cooling liquid flushing program, uses 30 Bar's water knife clears grinding wheel surface's iron chips.

Original factory actual operation middle extremely easily by neglected's clearing list habit must on wall:

· Every day off work before, uses non-woven cloth wipes optical linear scale reading head outer shell, prevents cutting liquid scales.

· Every week one empties chip discharging machine water tank bottom's depositing oil mud, thickness cannot exceed 50 millimeters.

· Every month uses feeler gauge checks one time dresser base gap, 0.02 millimeters feeler gauge inserts not inside just considers qualified.

· Changes different diameter's grinding wheel after, must enters parameter page puts dynamic balancing tolerance alters back 0.05 micrometers.

Entire 5 days' off-production training ends, worker learned puts single time dressing amount from 0.02 millimeters picks to 0.005 millimeters. That piece value 2000 US dollars' super hard grinding wheel, usage lifespan from predicted's 3 months forcefully pulled long to 8 months. Workshop's waste rate report sheet on, hardness not even causing's scrapped pieces from 5% dropped to 0.2% below.

Spare Parts & Rapid Response

Early morning two o'clock, workshop inside continuously ran 4000 hours' cylindrical grinding machine suddenly stops machine. Three color light's red light flashes not stopping, FANUC system screen on jumps out “SV0433 Frequency converter overloads” alarming code. Operator pressed three times reset key entirely without reaction, assembly line on's semi-finished gear shaft piled fully two baskets.

Stops machine one hour, factory assembly line loses reaches high 8000 yuan. Equipment factory's night shift duty mobile phone at ringing three sounds within by picked up. Engineer urged operator plugs on industry level 5G router network wire, through special line network gets to machine tool bottom layer's PLC controlling authority.

Factory engineer staring screen on real time transmits back's millisecond level servo current waveform. X-axis motor at starting instant's current peak soaringly rises to 45 amperes, equipment leaving factory set's standard numerical value highest not exceeds 18 amperes.

Troubleshooting work only used 12 minutes. Engineer intercepts machine near three days' historical temperature rising curve, finds clear X-axis screw rod end's NSK 7206 angular contact bearing already stuck dead. Carrying details' diagnosing sheet connecting with warehouse leaving warehouse instruction, at one minute within sends to distance client workshop 300 kilometers' East China spare parts center.

Original factory after sales fights is spot goods inventory depth. Floor area 2000 square meters' original factory constant temperature warehouse inside, all year round stores value exceeding 3000 tens of thousands' various types spare parts. Environment temperature all year round controlled at 22 degrees, 150 sets different specification's THK linear guide rails neatly stacked, surface's anti-rust oil warranty period by strictly controlled at 18 months within.

Spare parts warehouse's daily dispatching strictly guards time limit red line:

· A class urgent pieces (electromagnetic valve, encoder, optical linear scale reading head): inventory satisfying rate 98%, receives order after 2 hours within packs sends aviation piece.

· B class wearing pieces (scraping chip plate, filtering paper cloth, belt): constantly preparing 3 months consumption amount, same day orders same day afternoon 4 o'clock before by JD logistics sends out.

· C class large pieces (sheet metal outer shell, cast iron bed body): preparing goods amount less than 3 pieces, walks Debon heavy goods special line 48 hours within loads truck sends out.

Early morning 3 o'clock half, night shift warehouse manager from C area 14 number shelf's third layer, scans code takes out that set matched good's NSK bearing. Anti-static bubble film wrapped three layers, packed into pasting fragile label's paper box handed to door mouth waiting's special car driver.

Morning 7 o'clock, factory's repairing car stops at workshop door mouth. Trunk inside packed full dozens catties heavy's special tools, including SKF's induction heater and puller. Master wearing anti-static wristband, skillfully dismantles down machine tool right side's sheet metal protective cover.

Dial indicator measuring data shows, old bearing's ball bearing wearing peeling, clearance enlarged to 0.05 millimeters. Master uses cotton cloth dipped industry alcohol puts screw rod journal place wipes not one dust catches. New bearing set at induction heater on, sets heating temperature 110 degrees, baked entire 3 minutes smoothly inserts screw rod.

Changing precision parts strictly follows original factory standard actions:

· Torque wrench sets 12 Newton·meters, divides three times crosses twisting tight flange plate's 6 pieces M8 bolts.

· Hits on dial indicator turns moving screw rod, end face jumping error must not exceed 0.002 millimeters.

· Unseals brand new's one branch 150 grams packed Kluber NBU 15 high speed lubricating grease fills into cavity.

· X-axis empty runs half hour, infrared measuring temperature gun shows bearing seat surface temperature stays at 38 degrees within.

Coveting cheap buys in smuggled machine tool, meets on spare parts broken only can wait Europe headquarters walks DHL sends goods. Customs declaring adds on aviation transporting at least needs dry wait 14 days, workshop hands not out goods faces' breach penalty reaches high 20 tens of thousands yuan.

Machine newly runs, processed out coming's first piece gear shaft uses three coordinates measures out roundness 1.5 micrometers, tolerance completely hits standard. This trip rush repairing from stopping machine alarming to recovering production spends away not reaches 9 hours. Original factory after sales sheet on records down changing parts' SN code, machine tool automatically acquires new one round's 6 months warranty period.

Master leaves before smoothly hand uses refractometer looks one eye cutting liquid, concentration drops to 4%. He toward water tank inside supplements inside 20 liters original liquid, unplugs cooling liquid filtering machine inside used 30 days' 50 micrometers non-woven cloth filter paper changes on brand new's consumables.

Controlling cabinet's heat dissipating fan accumulates full one layer thick thick's oil dirt dust. Master unplugs 24V power line takes compressed air puts filtering cotton blows through. Electric cabinet inside's temperature from 45 degrees slowly drops back 35 degrees, equipment hidden danger at no sound middle by swept away.