WJ-800 Horizontal Machining Center | B-Axis Rotation, Table Load, and Deep Pocket Milling

WJ-800 is equipped with 0.001° high-precision B-axis, supporting multi-face continuous processing. Its worktable load reaches 2000kg, stability is strong.

Aimed at deep pocket milling, suggest adopting center water outlet forced chip removal, and coordinating with long-neck clearance tools layered feed, can effectively suppress chatter and ensure deep processing precision.

B-Axis Rotation

B-axis Definition

The WJ-800 worktable center deep part embedded a set of high-precision rotation structure, its physical axis and machine tool Y-axis completely parallel. This set of mechanism relies on a set of transmission ratio 1:180 large reduction ratio precision worm gear pair drive, transforming servo motor power into 5000Nm rotation torque. Every time instruction is issued, worktable will carry over ton weight workpiece, at per minute 20 revolutions speed in horizontal plane find preset angle.

CNC system divides one circle circumference equally into 360,000 parts, corresponding every minimum movement unit only 0.001 degrees. To ensure micro displacement can accurately land, machine tool internal equipped resolution 4 million pulses per revolution circular grating encoder. Full closed-loop feedback mechanism makes worktable at 500mm rotation radius edge, repeat positioning error controlled within 0.005mm.

Bearing capacity originates from worktable below combined thrust angular contact ball bearings, supporting up to 2500kg static load. Even if workpiece center deviates from rotation center 150mm, B-axis still can at 2.5rad/s2 acceleration smoothly start and stop. To prevent heat accumulation triggering precision decline, cooling oil liquid at per minute 15L speed in bearing seat around circulates, forcedly locking temperature difference within 2 degrees Celsius range.

When B-axis rotates to predetermined position, a set of diameter 400mm curvic coupling mechanism will rapidly intervene. This set of mechanism consists of two pieces carrying 72 precision ground helical teeth metal plates, under 8MPa hydraulic thrust tightly meshes. Physical level tooth mesh locking force far exceeds friction force, providing over 10000Nm anti-torsion rigidity, enough to handle 63mm face milling cutter with 5mm cutting depth during rough processing vibration.

· Tooth plate mesh precision maintains at plus/minus 3 arc seconds, effect equivalent to aiming at a coin 100 meters away.

· Hydraulic release and locking action cycle within 0.8 seconds completed, reducing non-cutting time loss.

· Worktable maximum rotation diameter locked at 1100mm, ensuring rotation when will not collide machine tool sheet metal guards.

· Sealing structure adopts four-layer labyrinth exhaust design, preventing high pressure cutting fluid penetrating precision worm gear chamber.

In processing depth reaching 250mm complex box cavity, B-axis rotation ability changed tool and part relative posture. If maintain vertical processing, length-diameter ratio exceeding 8:1 tool will produce serious tool deflection phenomenon, cutting speed forcedly limited at per minute 30 cubic centimeters. Through B-axis rotating 30 degrees, tool overhang length shortened by half, cutting rigidity subsequently increases, metal removal rate soars to per minute 100 cubic centimeters.

Originally easy at deep hole bottom accumulating iron chips, under gravity action follow inclined wall surface discharge, reducing tool chipping probability. For surface roughness requirement reaching Ra 0.8 micron mirror processing, stable inclined cutting angle is machine tool long time high load operation under a guarantee.

Environmental temperature every point fluctuation all will make B-axis rotation center happen displacement. Machine tool operating 4 hours later, Z-axis direction might produce 15 micron thermal displacement, this enough to affect high precision coaxial hole quality. Technicians usually call diameter 50mm ceramic standard ball, through machine tool own probe perform multi-point sampling, automatically calculate and update system internal coordinate compensation parameters.

· Calibration program through measuring 0 degree, 90 degree, 180 degree, 270 degree four positions, constructs real rotation trajectory model.

· System automatically corrects due to center of gravity imbalance produced eccentric torque, optimizes servo drive gain parameters.

· In 24 hours continuous processing, this compensation technology controls irregular hole position tolerance within 0.01mm.

· Built-in lubrication pump every 30 minutes automatically towards worm gear pair injects specified dosage extreme pressure grease.

B-axis physical stability determines WJ-800 in polyhedron part processing status. For needing from five faces perform processing gearbox housing, through B-axis precise rotation, single setup can complete all processes.

When worktable on workpiece exists mass imbalance, system will automatically limit maximum speed, and prompt operator adjust fixture center of gravity. Protection mechanism ensures precision worm gear in several years high frequency use, tooth side clearance always maintains at 0.008mm initial precision range.

Due to B-axis rotating when workpiece swing is huge, any exceeding pressure plate or protruding oil cylinder joint all belong to safety hazard. Simulation software according to input 1100mm maximum swing diameter performs collision detection, ensuring at any rotation angle, tool holder and worktable edge all maintain over 20mm safety distance.

Three Advantages

WJ-800 worktable base inside encapsulated a set reduction ratio 1 to 180 precision double lead worm gear pair, this set mechanism amplifies servo motor torque to 5000Nm. Through 4 million pulse high resolution circular grating, B-axis divides one circle circumference physically into 360,000 discrete positions, ensuring minimum instruction unit locked at 0.001 degree. In processing radius 500mm place, this tiny indexing increment lets edge positioning deviation always wander within 2 microns.

For one weight reaching 600kg gearbox housing, traditional vertical three-axis processing needs undergo 4 times setup, 4 times calibration. Every time manual intervention all will introduce at least 0.02mm setup cumulative error. WJ-800 utilizes B-axis in 1.5 seconds complete 90 degree indexing, letting every processing face hole system coaxiality controlled within 0.01mm, overall auxiliary man-hours reduced over 70%.

When B-axis rotates in place, 8MPa hydraulic oil pressure pushes 72 precision ground helical tooth plates completely mesh, producing 10,000Nm rigid locking torque. This hard link method excludes worm gear transmission under force reverse backlash, making machine tool when using 63mm face milling cutter, cutting depth reaching 5mm, bed still cannot hear any due to rigidity insufficiency triggered cutting howl.

Processing depth exceeding 200mm part internal cavity, B-axis rotation ability breaks traditional cutting physical limit. Under vertical state, tool length-diameter ratio usually as high as 8 to 1, cutting edge tip vibration will rapidly amplify to over 0.05mm. Through B-axis rotating workpiece 30 degrees, spindle head can deeper into workpiece internal, tool overhang length shortened 45%. Short thick tool holder increased system rigidity, roughness from Ra 3.2 micron improved to Ra 0.8 micron.

· Cutting angle offset let iron chips influenced by gravity, follow inclined surface at per second 3 meters speed discharge to chip conveyor.

· Avoided tool tip in chip accumulation area secondary cutting, carbide insert effective life extended 35%.

· Spindle after avoiding interference area, allows using highest speed perform high speed milling, single part processing cycle from 8 hours shortened to 3.5 hours.

· Heat dissipation oil liquid at 15L/min flow rate circulates, ensuring large power cutting when B-axis bearing temperature rise not exceed 2 degrees Celsius.

B-axis bearing capacity reached 2000kg, and under full load state still can maintain 2.5rad/s2 start-stop acceleration. This dynamic response relies on servo driver internal load sensing algorithm, it every second performs ten thousand times current scanning. When detecting workpiece exists over 100mm eccentric moment, system will automatically adjust gain, preventing rotation inertia on worm tooth surface produce per square millimeter exceeding 150N squeezing stress.

Environmental temperature every change 1 degree Celsius, worktable rotation center will produce about 10 micron physical displacement. To offset this thermal stability deviation, WJ-800 equipped diameter 50mm ceramic reference ball, operator every shift runs once coordinate compensation program. Probe at 0 degree, 90 degree, 180 degree three reference positions samples, automatically calculates and corrects system internal center deviation value, ensuring 24 hours continuous processing size consistency maintains at 0.008mm.

In programming stage, workpiece edge to rotation center furthest distance must be strictly limited within 550mm. Once exceeding this value, B-axis rotation produced huge kinetic energy will in 0.5 seconds hit sheet metal guards. Through software establishing based on maximum swing diameter virtual protection wall, can before program running intercept all due to coordinate offset triggered interference instructions.

Worm gear pair internal filled with molybdenum disulfide component containing extreme pressure grease, oil film thickness maintains at about 0.02mm. This micron level lubrication interval through automatic pumping system every 30 minutes supplements once, preventing heavy load rotation when metal direct contact.

Table Load

Static vs Dynamic

WJ-800 Horizontal Machining Center table size 800x800mm, rated static load calibrated as 1500kg. Machine tool base selects HT300 grade Meehanite cast iron, overall weight reaches 15 tons. Foundation bolts M24 specification total 8 groups, foundation base thickness must reach over 400mm to disperse 1.5 ton heavy pressure.

Z-axis adopts 50mm diameter, 10mm lead C3 grade ground screw. When 1.5 ton workpiece static placed on 7 strips 22mm wide T-slot table, slider internal rollers bear about 120MPa compressive stress. Screw end support bearing selects P4 grade combined bearing, resisting heavy load produced 0.003mm axial elastic deformation.

· Table Material: High hardness alloy cast iron (HRC 50-55)

· Support Guide: No. 55 heavy load roller linear guide

· Leveling Precision: Per meter 0.015mm

· Foundation Anchorage Force: Single point above 50kN

Center of gravity deviating from table center 100mm when, B-axis indexing plate suffers unilateral pressure unevenness. Guide lubrication pump needs provide 2MPa pressure oil film, preventing metal surface under 1.5 ton load happen 0.01mm dry friction scratch.

Dynamic load depends on B-axis rotation inertia. WJ-800 rotation table adopts 1:90 reduction ratio worm gear. 1200kg workpiece at 30rpm speed rotating, rotation inertia formula is one half mass times radius squared. Reversal action in 0.5 seconds completed, motor will produce rated output 3 times instantaneous current.

· B-axis Indexing: 0.001 degree resolution

· Positioning Precision: Plus/minus 3 arc seconds

· Repeat Positioning: Plus/minus 1.5 arc seconds

· Hydraulic Locking Force: 3000Nm

300kg below small parts at 5000rpm speed easy produce 40Hz high frequency resonance. 1.2 ton heavy part utilizes own mass suppress 80% of cutting amplitude. Processing depth 300mm cavity, side wall verticality deviation controlled in 0.008mm range.

BT50 spindle provides 25kW power output. Deep pocket cutting force produced lever arm length reaches 450mm, on B-axis locking mechanism applies overturning moment. Hydraulic station constant pressure 5MPa ensures indexing plate position not happen 0.002mm retreat. Spindle bearing sleeve flows in 20 liters per minute cooling oil.

· Bearing Cooling Oil Temp: 22 degrees Celsius constant

· Tool Change Time (T-T): 2.5 seconds

· Maximum Tool Weight: 25kg

· Cutting Water Pump Pressure: 2.5MPa

Continuous bearing 1200kg work 2000 hours, worm gear wear amount about 0.005mm. Laser interferometer every half year needs re-measure once axial precision. System compensation parameters subsequently adjust about 10%.

Cooling system every minute circulates 250 liters emulsion. Heavy load workpiece heat capacity large, processing temperature rise if reach 5 degrees Celsius, 800mm table will produce 0.015mm thermal expansion. Bed internal arranged 4 chip removal slopes, coordinating 0.2MPa flushing pressure take away 90% of hot chips.

· Screw Elongation Compensation: Per meter 0.01mm

· Motor Feedback Pulse: 1,048,576 pulses per revolution

· Air Curtain Sealing Pressure: 0.15MPa

· Guide Oil Consumption: Per hour 3 milliliters

1.5 ton load in X-axis 24m/min rapid move when produce huge inertia. CNC system look-ahead 500 blocks, pre-judging acceleration-deceleration curve inflection points. Servo lag amount set within 2ms, preventing deep pocket bottom produce 0.02mm overshoot marks.

Heavy fixture selects 7075-T6 high strength aluminum alloy. Base weight reduction 200kg can for workpiece make room for same amount load quota. Pressure plate bolts select 12.9 grade high strength fasteners. Torque wrench set 150Nm tightening force, preventing heavy load rotation when workpiece happen micron level offset.

· Spindle Runout: 0.002mm

· Tool Change Repeat Precision: 0.005mm

· Machine Installed Capacity: 45kVA

· Slider Preload Grade: Medium preload (ZA)

Spindle head hydraulic counterweight system dynamic response time 15ms. Z-axis descending process pressure automatically fine-tunes 0.3MPa. Offsets heavy load on Z-axis motor produced gravity load burden. This physical balance makes 1.5 ton worktable in vertical direction moving resistance maintain at 500N constant value.

Lubrication failure will lead to guide surface 0.02mm precision permanent loss. Pressure sensor real-time monitors oil path. Oil supply interval follow B-axis rotation frequency dynamically shortens. Full load operation state under, distributor oil discharge volume increases 20% to maintain 5 micron thickness rigid oil film.

· Oil Pump Start Interval: 15 minutes

· Filtration Precision: 10 micron

· System Alarm Threshold: Pressure below 0.8MPa

· Guide Friction Coefficient: 0.003-0.005

Deep pocket tool length-diameter ratio exceeding 5:1 when, cutting force fluctuation frequency close to machine tool natural frequency. WJ-800 through increasing worktable load mass to change resonance point. 1.5 ton heavy load will process system rigidity increase 30%.

Center of Gravity Position

WJ-800 Horizontal Machining Center worktable area is 800x800mm, rated static bearing limited at 1500kg. When 1.5 ton workpiece placed on table, physical center of gravity position (CoG) determines machine tool geometric precision holding time. If center of gravity deviates from worktable center 100mm, B-axis support bearing will bear extra 150Nm overturning moment, this will lead to rotation precision from 3 arc seconds drop to 8 arc seconds.

Machine tool base adopts HT300 Meehanite cast iron, this material anti-deformation ability is 250MPa. Workpiece center of gravity if too high, for example reaching above 500mm, X-axis at 24m/min speed rapid move and sudden stop when, will produce as high as 0.5G inertia acceleration. This impact force through No. 55 roller guide transmit to bed, making column happen about 0.005mm instantaneous elastic offset.

To avoid this deviation, WJ-800 random manual provided detailed load-CoG envelope diagram. When CoG height from 200mm rises to 800mm, allowed maximum load amount will from 1500kg linearly drop to around 750kg. If operator ignores this data density, Z-axis screw in long term asymmetric force under, return error will from 0.003mm gradually wear to 0.01mm.

· Worktable T-slot Width: 22mm (H7 precision)

· CoG Radial Allowed Deviation: Less than 150mm

· B-axis Maximum Torque Output: 3000Nm (Hydraulic locking state)

· Y-axis Drive Screw Diameter: 50mm

· Slider Preload Grade: ZA grade (Medium preload)

· Worktable Rotation Repeat Precision: Plus/minus 1.5 arc seconds

CoG deviating from center line will lead to B-axis transmission mechanism worm gear pair produce asymmetric contact. 1:90 reduction ratio under eccentric load, tooth surface contact pressure will from normal 40MPa soar to 85MPa. This local high pressure will destroy ISO VG 68 guide oil formed 5 micron thick oil film, leading to worm gear in rotation indexing produce slight crawling phenomenon.

Deep pocket processing in fixture design must consider weight reduction, selecting 7075-T6 aluminum alloy replace ordinary 45 steel, can make fixture self-weight reduce over 60%. Reduced 200kg weight if can exchange for CoG descending 100mm, spindle in performing 400mm depth milling when vibration frequency will from 45Hz move out of resonance zone. Actual measurement shows, CoG every reduction 10%, part surface roughness Ra value can improve 0.2 micron.

Below table shows WJ-800 in different CoG heights under bearing capacity limits:

Workpiece CoG eccentric also will affect APC automatic pallet changer operation smoothness. Changer arm in 15 seconds complete rotation action, if load CoG deviates to one side, changer arm shaft will bear over 5000N radial impact. Long term eccentric load operation will lead to changer system hydraulic buffer life shorten 40%, even appear exchange in place after mechanical lock alarm.

In deep pocket milling process, due to tool length-diameter ratio usually exceeds 5:1, cutting force produced lever effect will amplify CoG instability brought negative consequences. When CoG is high, cutting point produced 1000N lateral force at worktable bottom will evolve into 5000N thrust. This will lead to B-axis brake disc happen 0.002 degree micro slippage, directly on deep pocket side wall leave obvious tool marks.

· Hydraulic Station Standard Pressure: 5.0MPa

· Spindle Taper Hole Runout: Within 0.002mm

· Lubrication Pump Single Discharge: 3 milliliters

· Bed Casting Heat Aging Treatment: Greater than 72 hours

· Guide Straightness: Per meter 0.003mm

· Motor Encoder Resolution: 24-bit (16,777,216 pulses)

Due to WJ-800 adopting horizontal layout, workpiece gravity direction and Y-axis parallel. CoG closer to spindle box, Y-axis motor bears static torque more constant. If CoG towards outside overhanging exceeds 200mm, Y-axis ball screw load rate will from 25% increase to 55%. This load fluctuation will trigger servo system gain mismatch, leading to processed arc appearing 0.015mm ellipticity error.

Long term processing heavy load eccentric part machine tools, their worktable surface often will appear 0.01mm around flatness sinking. Maintenance personnel need regularly use laser interferometer perform full circle precision compensation for B-axis. Data input to system after, although can correct 80% of positioning deviation, but cannot eliminate physical stress on guide slider rollers caused 2 micron fatigue peeling.

· Foundation Concrete Strength: C30 grade

· Cutting Fluid Oil-water Separation Rate: 95%

· Spindle Constant Torque Frequency Range: 50-600Hz

· Worktable Maximum Swing Diameter: 1100mm

· Tool Change Point Z-axis Repeat Precision: 0.005mm

Workpiece if arranged too far back, chips easy accumulate in B-axis rotary table and telescopic guard gap. 0.15MPa air curtain seal although can block dust, but cannot resist heavy load pressure under penetrating fine aluminum chips. These impurities entering bearing seat after, will make rotation friction torque increase 15%, inducing motor overheat alarm.

Adjusting CoG to worktable geometric center within 20mm range, can make screw usage life extend over 2 times. For CoG height exceeding 400mm parts, suggest in process document clearly mark: Strictly forbid using G00 full speed move, must lock override knob at 50% or lower position.

· Every 2000 hours check B-axis reverse backlash

· Guide Lubrication Oil Consumption: Every 24 hours 0.5 liters

· Hydraulic Oil Replacement Cycle: Every 12 months

· Electrical Cabinet Heat Exchanger Power: 1500W

· System Look-ahead Block Quantity: 500 blocks

Spindle in performing gravity load under high speed cutting when, spindle box hydraulic balance system will real-time compensate Z-axis sagging amount. If CoG offset too large, balance cylinder response delay will from 10ms increase to 25ms. This micro delay in processing 300mm above length-diameter ratio hole when, will lead to hole axis line straightness error exceed 0.02mm, cannot satisfy aerospace grade part assembly requirement.

Mass Damping

WJ-800 Horizontal Machining Center 800x800mm worktable self-weight about 850kg, coordinating 1500kg maximum load, movement unit total mass close to 2.4 tons. This type mass distribution in deep pocket processing formed physical level energy trap, can effectively absorb BT50 spindle at 3000rpm speed produced excitation force. When 400mm length-diameter ratio milling cutter enters cavity deep part, cutting frequency usually at 80Hz to 120Hz fluctuation, heavy load will system damping ratio from 0.02 lift to 0.05 above.

In 1200kg load condition under, workpiece and table between T-slot connection rigidity reached 1000N/μm. This mass accumulation changed machine tool natural frequency, moving resonance point from easy occurrence zone 150Hz to 95Hz below. Actual measurement data shows, load every increase 100kg, deep pocket side wall vibration mark depth average reduces 0.5 micron. For extension reaching 350mm vibration damping tool bar, this base mass support makes Ra 0.8 grade surface finish pass rate lift 25%.

In No. 40 steel deep pocket continuous milling test, load as 500kg when, spindle box vibration acceleration as 1.2m/s2; when simulated load through pressure block lift to 1300kg when, same cutting depth acceleration drops to 0.45m/s2. Mass block produced inertia offset over 60% cutting instantaneous impact, preventing tool tip chipping.

· Spindle Rated Power: 22/26 kW

· Maximum Torque: 600 Nm

· Table Repeat Positioning Precision: 0.003mm

· B-axis Hydraulic Locking Force: 3000 Nm

· Cutting Amplitude Suppression Rate: Full load state lift 40%

· Guide Lubrication Oil Film Pressure: 2.2 MPa

WJ-800 table flatness controlled within 0.01mm/800mm, ensuring 1.5 ton workpiece bottom and cast iron surface effective contact rate exceeds 75%. If contact area lower than 50%, heavy part in high frequency cutting under will produce micro-second level "jumping" phenomenon. This will lead to Z-axis screw bearing per minute 3000 times micro reverse impact, making bearing life shorten about 1800 hours.

15 ton overall machine weight and 1.5 ton worktable load form 10:1 rigidity ratio. In performing deep pocket side wall finish milling, spindle feed speed set as 1500mm/min, back cut depth 0.2mm. At this time, worktable huge inertia guaranteed B-axis indexing plate will not due to cutting resistance produce 0.001 degree micro deflection.

Aimed at 5:1 length-diameter ratio tool mold processing, adjusting worktable counterweight to rated load 70% is optimization scheme. Through increasing 300kg dedicated counterweight base, can make processing course noise level from 85dB reduce to 72dB. Sound frequency change is mass damping changed process system stiffness direct evidence.

· B-axis Speed Limit: 25 rpm

· Worktable Positioning Pulse Number: 1,048,576

· Cold Start Thermal Deformation: < 0.01mm

· Foundation Bearing Pressure: 150 kN/m2

· Automatic Tool Changer Load: 25 kg

· System Look-ahead Lines: 500 blocks

Screw cooling system temperature control precision set at plus/minus 0.5 degrees Celsius. Heavy load operation process during, Y-axis motor output torque maintains at rated value 40% around. If load too light, motor frequent acceleration-deceleration will lead to 800mm screw produce 0.015mm thermal elongation. 1.2 ton workpiece mass played heat balancer role, its huge heat capacity slowed worktable in 8 hours continuous operation in dimension fluctuation, positioning precision fluctuation range narrowed to 5 micron.

WJ-800 CoG optimization design makes 1.5 ton load located at table center when, column static deflection deformation amount only 0.004mm. In dynamic milling, this mass damping effect suppressed column swing cycle. Comparing 200kg light load processing, heavy load state under hole position cylindricity actual value by 0.012mm optimized to 0.007mm.

Hydraulic brake system in B-axis stop moment applies 5MPa pressure. Heavy load under rotation inertia leads to brake disc friction temperature rise reach 45 degrees Celsius. To maintain mass damping stability, WJ-800 adopts oil cooling circulation dissipate B-axis heat. Per minute 15 liter cooling oil flow can take away 85% friction heat, ensuring 1.5 ton workpiece in frequent indexing processing, its rotation center axis line drift not exceed 0.005mm.

Servo system gain parameters need follow load dynamic adjustment. Load from 100kg increase to 1500kg, system position loop gain needs compensate about 15%. If maintain low load parameters perform heavy load deep pocket milling, corner cutting force fluctuation will induce servo lag, produce 0.02mm contour overshoot.

Deep Pocket Milling

Physical Resistance

Steel part chip density is 7.8g/cm3, entering 100mm above deep pocket when, accumulated chips produce huge internal friction resistance. This resistance forces spindle load instantly increase 20% above, friction produced secondary cutting heat will tool tip temperature push up to 800 degrees Celsius.

WJ-800 horizontal structure utilizes 9.8m/s2 gravity acceleration. Spindle horizontal rotation, chips in fracture moment by centrifugal force and gravity common action, present parabola shape脫离 deep pocket bottom. 200L/min large flow flushing system coordinating 45 degree inclined bed, ensure metal residue in 5 seconds discharge processing zone, avoid heat transmit to workpiece substrate.

When L/D depth-diameter ratio from 3 lift to 10, tool bar end deflection resistance presents geometric grade growth. Selecting elastic modulus 600GPa carbide long handle tool, can offset most radial cutting force. WJ-800 BT50 spindle provides strong radial stiffness, ensuring 300mm overhang under runout lower than 0.01mm.

· B-axis Indexing Precision: 0.001 degree (High precision position compensation)

· Worktable Load: 1500kg (Heavy load cutting under dynamic stability)

· Center Water Outlet Pressure: 70 bar (Break through deep hole air pressure layer)

· Spindle Torque: 600 Nm (Low speed under large cut depth support)

· Axial Acceleration: 12m/s2 (High speed retracting prevent scratch surface)

WJ-800 70 bar center water outlet system presses cooling liquid into tool tip 0.5mm range. This high pressure jet broke through due to tool high speed rotation formed air resistance layer, lifting tool life 2 to 3 times.

Processing No. 45 steel deep pocket when, cutting speed Vc maintains at 180m/min. Chips by high pressure liquid flow squeezing, formed C-type curl length usually less than 15mm. This shape chips in 300mm depth hole internal will not produce strangling resistance, reducing machine tool spindle bearing alternating stress, making equipment operation noise control in 75 decibels below.

B-axis rotation worktable through changing processing vector to reduce physical resistance. Facing 400mm depth large box, rotating worktable 180 degrees perform two ends through processing. This process will 400mm unilateral resistance decompose into two 200mm low resistance intervals. B-axis equipped 2500 Nm locking torque ensured processing course coordinate system rigid support.

When detecting feed load exceeds rated value 10% when, controller will at millisecond speed fine-tune feed amount fz. This active feedback mechanism responded to deep pocket internal material hardness uneven produced impact resistance. Maintaining 0.15mm per tooth feed, coordinating 10% radial step ae, can maximum degree reduce long tool bar vibration frequency.

· 45# Steel: Speed 180m/min, Feed 0.12mm/t, Metal Removal Rate 180cm3/min

· 304 Stainless Steel: Speed 100m/min, Feed 0.08mm/t, Metal Removal Rate 65cm3/min

· HT250 Cast Iron: Speed 250m/min, Feed 0.20mm/t, Metal Removal Rate 240cm3/min

WJ-800 adopts 8 ton weight Meehanite cast iron bed. This material internal contains graphite flake structure can effectively suppress 200Hz around low frequency resonance. Even in deep pocket rough processing produce huge vibration resistance when, bed structure still can through internal damping characteristics digest it. Actual measurement shows, processed deep pocket side wall verticality error in full length range less than 0.015mm.

Comparing ordinary power chuck, heat shrink holder at 8000rpm under dynamic balance grade reaches G2.5 grade. Smaller rotation inertia resistance reduced spindle useless work loss. WJ-800 rapid tool changer mechanism in 2.5 seconds complete action, high frequency tool change cycle supported multi-process complex deep pocket continuous operation.

Hydraulic station pressure accurately adjust to 1.5MPa, both guaranteed cutting when not shift, and avoided retracting after rebound error. Full closed-loop grating scale real-time monitors three-axis position, its 0.003mm positioning precision ensured deep pocket bottom step face tool connecting smoothness, naked eye almost cannot observe tool marks.

Cooling liquid filtration system precision set as 20 micron. Clean medium reduced for center water outlet rotary joint wear resistance, maintaining 70 bar stable pressure output. WJ-800 this high standard fluid configuration, makes deep pocket processing from high difficulty process challenge transform into predictable, high repeatability standardized production flow.

Processing Advantage

WJ-800 Horizontal Machining Center horizontal layout let chips influenced by 9.8m/s2 gravity. Vertical machining center in depth exceeding 100mm blind hole operation when, chip accumulation produced friction force will make spindle current load lift 20% above. Horizontal machining spindle axis and ground parallel, chips in fracture moment脫离 workpiece surface, roughness Ra value can maintain at 1.2 micron level.

Chip removal pump flow reaches 200L/min, coordinating 45 degree inclined bed, metal debris in 3 seconds slide into chain plate chip conveyor. This structure prevented 800 degrees Celsius high temperature chips in hole bottom accumulation, reducing workpiece due to local heat produced 0.01mm level thermal deformation. Processing 7075 aluminum alloy when, per minute 300 cubic centimeter chip removal volume will not cause tool chipping.

WJ-800 Performance Specification Parameters:

· Pallet Load: 1500kg (High rigidity support)

· B-axis Indexing: 0.001° (High precision rotation)

· Rapid Move: 60 m/min (Reduce non-cutting time)

· Tool Change Speed: 2.5s (T-T tool change efficiency)

· Positioning Precision: 0.003mm (Full closed-loop feedback)

· Repeat Positioning: 0.002mm (High consistency output)

0.001 degree indexing B-axis for deep pocket side provided geometric degree of freedom. Length-diameter ratio L/D reaching 8 long tool can horizontal enter hole diameter, avoided vertical machining center in long tool vertical descending formed chip removal blind zone. B-axis equipped 2500 Newton-meter locking torque, in performing 5mm depth heavy cutting when, worktable will not produce any angular displacement deviation.

Through B-axis rotating 180 degrees, originally needing 400mm length tool can decompose into two times 200mm through processing. According to physical deformation calculation, tool length halved will make rigidity lift 8 times, tool tip radial jump controlled in 0.005mm range, extended tool 50% usage life.

70 bar high pressure cooling liquid through BT50 spindle center hole spray. This pressure enough to break through high speed rotation tool produced air resistance layer, sending cooling liquid spray to 0.5mm cutting point. Processing No. 45 steel deep pocket when, internal cooling system will cutting zone temperature from 900 degrees Celsius rapidly drop to 200 degrees Celsius below, preventing cutting edge diffusion wear.

WJ-800 Deep Pocket Processing Technical Details:

· Spindle Torque: 600 Nm (Large diameter tool support)

· Cooling Pump Power: 5.5 kW (High pressure liquid power)

· Casting Weight: 8000kg (Absorb harmonic vibration)

· Screw Diameter: 50mm (High load transmission rigidity)

· Filtration Precision: 20 micron (Protect rotary joint)

· Spindle Speed: 10000 rpm (High efficiency processing)

8 ton weight base adopts Meehanite FC30 cast iron material. This cast iron contains 3.2% to 3.4% carbon, its internal damping characteristics than ordinary steel structure high out 10 times, can neutralize 150 Hertz around cutting vibration. In processing depth 300mm box part when, side wall verticality in full length range error less than 0.015mm.

Machine tool equipped Heidenhain grating scale perform full closed-loop feedback. 0.1 micron resolution real-time corrected screw in long up to 12 hours operation produced 0.01mm thermal elongation. Even in temperature difference change 5 degrees Celsius factory environment under, WJ-800 still can ensure hole center distance position degree control within 0.008mm.

Dynamic milling path let tool wrap angle constant at 30 degree. WJ-800 servo response frequency as 2000Hz, ensuring at R5 corner feed speed not drop. Processing 304 stainless steel when, cutting speed Vc set as 120m/min, side cut Ae maintains at tool diameter 10%, significantly reduced action on long tool bar bending moment.

Heat shrink holder coordinating BT50 taper hole provided 30000 Newton clamping force. At 8000rpm speed under, G2.5 grade dynamic balance precision ensured spindle operation stable. WJ-800 large diameter bearing arrangement scheme lifted 30% radial load capacity, even in processing uneven casting hard spots when, spindle load fluctuation also control within 5%.

Tool change manipulator in 2.5 seconds complete action. 40 tool positions disc-type magazine supports deep pocket processing needed all rough-finish toolings. Hydraulic tool change mechanism repeat positioning precision reaches 0.001mm, ensured every time after tool change tool tip position consistency, eliminated deep pocket wall surface tool connecting step marks.

Chip removal slope angle design as 45 degree, prevent debris retention. Flushing device with 1.5MPa pressure cover bed internal, will 150 degrees Celsius chips flow to back end time compress to 5 seconds. This rapid heat isolation protected machine tool bed structure geometric precision, making WJ-800 possess high strength continuous operation capacity.

Process Parameter Configuration

WJ-800 Horizontal Machining Center in executing deep pocket milling when, lateral cut ae usually set in tool diameter 8% to 12%. Taking diameter 20mm carbide milling cutter for example, ae locked in 1.6mm to 2.4mm range. This small radial cut coordinating 1.5 times diameter back cut ap, can make long overhang tool deflection moment reduce over 60%, guarantee 300mm depth under processing precision.

Processing hardness as HRC35 mold steel when, cutting speed Vc maintains at 160m/min. Spindle speed n about 2500rpm, per tooth feed fz control in 0.12mm. This parameter combination will tool tip heat transmission proportion control in 10% below, remaining 90% heat follow chips by WJ-800 chip removal system take away.

Machine tool B-axis rotation worktable positioning precision reaches 0.001 degree. Processing irregular deep pocket side wall, through B-axis compensation 0.005mm coordinate drift. In performing 500mm depth double-face through processing when, two ends tool connecting place step error less than 0.01mm. WJ-800 2500Nm locking torque prevented heavy load cutting produced angular displacement.

Per tooth feed fz fluctuation directly affects 0.015mm surface verticality. In WJ-800 panel monitoring, spindle load curve should smoothly maintain at rated power 45% place. fz from 0.1mm lift to 0.2mm will make tool tip amplitude expand 3 times. Operator needs through servo system 2ms response cycle, real-time compensate cutting force fluctuation triggered trajectory deviation.

· Rough Processing Allowance: Single side leave 0.3mm to 0.5mm

· Dynamic Milling Wrap Angle: Constant 35 degree cut-in

· Finish Processing Cut Depth: ae fixed at 0.1mm

· Feed Override Adjustment: Corner place automatically drop 20%

· Tool Tip Radius Compensation: 0.001mm grade correction

· Axial Feed Speed: Highest 60m/min rapid retract

BT50 spindle at 800rpm low speed under provide 600Nm torque. This characteristic supported diameter 50mm roughing tool perform 4mm depth slotting operation. Processing course during, 70 bar center water outlet with 45m/s initial speed injects. High pressure liquid flow broke through deep pocket internal formed air resistance layer, lifting tool life from 45 minutes to 120 minutes above.

WJ-800 adopts 50mm diameter precision large lead screw. Screw internal cooling circulation system will temperature rise control in 2 degrees Celsius. In long up to 8 hours continuous deep pocket milling, three-axis thermal elongation compensation value locked at 0.003mm. This thermal stability guaranteed deep pocket bottom positioning hole and opening place coaxiality error less than 0.012mm.

Meehanite cast iron bed weight reached 8 tons. This material 3.4% carbon content provided excellent vibration damping. Processing frequency at 200Hz when vibration amplitude absorbed by casting structure 85% above. Even in performing 180cm3/min high removal rate processing when, machine tool side level reader fluctuation still maintains within 0.02mm/m.

· 45# steel: Vc=180m/min, fz=0.15mm

· 304 stainless steel: Vc=110m/min, fz=0.08mm

· 7075 aluminum alloy: Vc=850m/min, fz=0.25mm

· QT500 cast iron: Vc=220m/min, fz=0.18mm

· titanium alloy: Vc=50m/min, fz=0.06mm

· tool steel: Vc=130m/min, fz=0.10mm

Aimed at thin wall parts, hydraulic chuck pressure should adjust to 1.2MPa to 1.8MPa. Processing thickness 5mm deep pocket side wall, adopting constant height profile milling divided into 20 layers complete. Every layer cut ap as 2mm, this segmented release stress method, avoided part after unloading produce 0.05mm above shape rebound, ensure geometric tolerance meet standard.

Heat shrink holder at 12000rpm speed under performs G2.5 grade balance. Comparing traditional spring chuck, its rotation inertia reduces 40%. WJ-800 spindle bearing group adopts 110mm large diameter design, lifted 35% axial bearing capacity. In cutting force reaching 3000N condition under, spindle temperature rise always lower than 15 degrees Celsius environment temperature difference.

Tool magazine capacity as 40 pieces, tool change time 2.5 seconds. In deep pocket processing program, every interval 15 minutes call once in-machine tool setter. 0.001mm measurement precision can real-time update tool wear compensation value. This closed-loop control logic solved 0.2mm coating wear leading to size out-of-tolerance hidden danger, making pass rate stable at 99.5% above.

Chip removal slope and horizontal plane form 45 degree angle. Base flushing flow 150L/min, will 150 degrees Celsius chips in 4 seconds push into chip conveyor. This rapid heat discharge design blocked heat towards machine tool base transmission, coordinating full closed-loop grating scale real-time feedback, limiting processing zone thermal drift error to micron level, supported high strength 24 hours continuous operation.