Best Duplex Milling Machine for Plastic Mold Bases (P20 Steel)

For making P20 mold bases, recommend double-head CNC machine, such as TH-520NC double-head milling machine, accuracy ±0.01mm, verticality ≤0.015/300mm, double spindles 2×7.5kW.

One-time clamping can process four sides, efficiency improved about 4 times.

Use hydraulic fixture positioning, choose carbide face milling cutters, match with large flow cooling, guarantee roughness ≤Ra1.6μm.

Rigidity and Power

Structural Rigidity

Machine tool base is constructed by HT350 high-grade cast iron, this material compared with ordinary HT250 possesses higher damping ratio, absorbing P20 pre-hardened steel cutting impact. Castings after rough machining undergo 18 months natural aging, coordinated with secondary manual vibration aging, eliminating residual stress to prevent bed deformation. 1000mm stroke double-head milling machine, total weight standard configuration is above 12500kg, ensuring displacement deviation under heavy cutting is maintained at 0.005mm.

Column interior uses 45 degree cross-type honeycomb-shaped reinforcing ribs, rib plate thickness is maintained between 35mm to 45mm, enhancing anti-torsion rigidity. Two columns within 500mm span, when subjected to 8000N thrust from each side spindle, top micro opening amount is controlled at 0.003mm.

· Machine tool base floor space needs to reach 3200mm x 2800mm, dispersing unit area load-bearing capacity.

· Spindle box wall thickness is designed as 50mm, using double-layer wall casting process to reduce thermal deformation influence.

· X-axis guide rail spacing is set above 650mm, increasing cutting torque support stability.

· Foundation bolts choose M36 specification, matching with above 300mm thickness reinforced concrete foundation grouting.

Spindle system configures NN3024K series double-row cylindrical roller bearings, inner diameter 120mm, mainly bearing radial load. Front end matches 110TAC20 grade angular contact ball bearing group, preload force adjusted to 3500N, preventing axial runout of face milling cutter when cutting into P20. Spindle rotation accuracy actual measurement is controlled within 0.002mm, leaving Ra 0.8μm cutting textures on high hardness steel surface.

Power transmission path eliminates belt drive, changed to 1:6 ratio automatic shift gear transmission mechanism, gears through five-stage precision grinding, hardness HRC 58. Under 80 RPM low speed, single side spindle output torque can reach 1250Nm, supporting 200mm diameter cutter head one-time removing 6mm depth. Spindle end possesses oil cooling circulation, flow rate maintained at 22L/min, suppressing spindle bearing temperature rise within 8℃ of room temperature.

· Worktable is treated by high-frequency quenching, surface hardness reaches HRC 52, compressive strength not lower than 650MPa.

· Hydraulic clamping system pressure is set at 6MPa to 10MPa, single side clamping force output 3 tons.

· Lead screw chooses diameter 50mm, pitch 10mm C3 grade double nut preloaded ball screw.

· Y-axis servo motor torque configured as 45Nm, ensuring no step loss deviation under 500mm/min feed speed.

Rectangular hard rail sliding surface width 240mm, surface through ultra-audio quenching, depth above 3mm, wear resistance increased 40%. Slider surface pasted with 2mm thickness Turcite-B anti-friction material, through precision scraping realizing 25 points/square inch contact surface. This layout solves the crawling phenomenon existing in P20 processing, making 0.01mm micro compensation commands able to be accurately executed by the mechanical system.

Because P20 material composition contains Cr (chromium) and Mo (molybdenum), cutting heat easily accumulates at the junction of cutter tip and machine head. Double columns symmetrically installed with temperature sensors, real-time feedback thermal displacement to CNC system for automatic compensation, error controlled at 0.012mm. Machine tool cooling system pressure reaches 3kg/cm², ensuring high pressure oil mist quickly takes away above 350℃ cutting heat.

· Tool holder interface chooses BT50 powerful type, matching with 25mm pull stud, providing above 2.5 tons pull force.

· Spindle motor constant power speed range set at 200-1200 RPM, matching P20 economic cutting speed.

· Worktable parallelism calibration standard set as within 0.008mm error per 300mm range.

· Machine tool full stroke geometric accuracy offset through laser interferometer detection needs to be lower than 0.015mm.

High rigidity bed under 24 hours continuous operation can maintain position consistency of spindle centerline and worktable surface. Facing P20 mold base processing common interrupted cutting environment, high damping cast iron can suppress vibration frequency below 15Hz, extending tool blade life 25%. This equipment design logic from physical level solves the warping deformation easily produced by thin plate type mold base processing, compressing secondary grinding allowance to 0.05mm.

Gearbox interior uses forced lubrication, ensuring gear surface does not occur dry friction under 1500kg radial cutting force. Spindle bearing lubrication oil adds anti-extreme pressure additives, dynamic load life calculated value exceeds 15000 hours. Through improving metal removal rate per unit time, rough machining process originally needing 4 hours can be shortened to 110 minutes under the premise of meeting 0.02mm parallelism.

Power Configuration

P20 steel processing power matches 18.5kW AC asynchronous spindle motor, providing constant torque under rated speed. This material hardness is around HRC 30, low speed segment torque output is stable at 1200Nm, preventing speed drop from exceeding 5% at the instant tool cuts in. Double-side milling supports 250mm face milling cutter advancing with 5mm cutting depth.

Spindle transmission path gives up belt form, using 1:6 ratio gear transmission mechanism. Gears choose 20CrMnTi alloy steel, through carburizing and quenching treatment to HRC 58. Secondary ratio amplifies motor output torque, ensuring spindle possesses strong power under 60 RPM heavy cutting speed. Single tooth meshing overlap degree maintains at 1.4, reducing mechanical noise during power transmission process.

· Spindle rated current set at 65A to 80A, peak overload capacity reaches 150%.

· Shifting mechanism action pressure maintains at 4MPa, shifting time 1.5 seconds.

· Transmission bearings choose P4 grade accuracy, dynamic balance accuracy grade reaches G1.0.

· Gear oil pump flow rate 15L/min, matching with 30 micron filtering accuracy filter element.

· Motor shaft connection uses expansion sleeve structure, transmission torque upper limit is 3 times higher than key connection.

X-axis and Y-axis feed power is driven by large inertia servo motors, single axis thrust breaks through 12000N to overcome P20 cutting resistance. Feed mechanism matches diameter 63mm grinding grade ball screw, pitch 12mm, ensuring 8 meters per minute rapid traverse speed. Power reserve supports 1.5 tons heavy mold base blank performing reciprocating processing under 400mm/min feed speed.

Servo driver dynamic response frequency set at 2.0kHz, compensation time for load fluctuation controlled within 10 milliseconds. When face milling cutter encounters P20 internal hard points, driver maintains feed trajectory by increasing 30% instantaneous current. Screw bearing seat adopts back-to-back installed four-row angular contact bearings, pre-tension force adjusted to 8000N.

· Z-axis spindle head slide table counterweight uses hydraulic balance, pressure fluctuation controlled within 0.2MPa.

· Oil cooler cooling capacity needs to reach 5000kcal/h, spindle lubrication oil temperature difference controlled within ±1℃.

· Power cables choose flexible shielded wire, bending radius not less than 10 times wire diameter.

· Inverter carrier frequency set as 8kHz, balancing operation output and electromagnetic compatibility.

· Screw pair support method adopts double end fixed, eliminating axial movement under large torque.

Spindle internal lubrication path distributes 4 independent oil channels, targeting front and rear bearings for forced circulation cooling. Lubrication oil chooses ISO VG32 standard, kinematic viscosity at 40℃ is 32cSt. Power system under environment temperature 35℃ continuous full load running for 8 hours, spindle head shell temperature not higher than 45℃.

High power output matches chip removal power, machine tool two sides configure 1.5kW spiral chip conveyors. Chip removal torque 250Nm, sufficient to crush P20 produced curly blue chips and transport. Powerful water pump pressure reaches 5bar, flow rate 120L/min, through 6 circular nozzles performing all-round flushing on cutting area.

· Electrical cabinet equipped with 1.0 hp industrial air conditioner, internal temperature locked at 25℃.

· Spindle speed sensor resolution 1024 pulse/rev, correcting output deviation.

· Hydraulic station oil cylinder chooses fluororubber sealing rings, withstanding 150℃ high temperature.

· Spindle front end labyrinth seal matches air curtain protection, positive air pressure 0.15MPa.

· Transmission gears adopt gear grinding process, contact spot area proportion exceeds 85%.

Power system output linearity within 50 RPM to 1200 RPM range deviation less than 0.5%, ensuring P20 surface without tool marks. Feed axis servo motor and lead screw directly connected through high rigidity diaphragm coupling, torsional rigidity reaches 450000Nm/rad. Increasing unit cutting edge load pressure transforms P20 pre-hardened material processing into powerful cutting.

Processing 800mm x 600mm x 200mm P20 mold base, rough milling six sides time shortened to 95 minutes. Machine tool total power consumption efficiency ratio increased to 0.85, metal removal volume ratio under unit electricity consumption is 40% higher than old model equipment. Feed servo system response lag under 0.01mm increment command is lower than 2 milliseconds.

Squareness and Parallelism

Squareness

When processing P20 mold steel mold base, verticality error directly depends on the geometric offset angle between spindle axis and worktable movement trajectory. When two 200mm diameter milling cutter heads synchronously feed within 500mm stroke, machine tool's verticality compensation value should be set within 0.005mm. If cutter head center exists 0.015mm micro tilt, processed mold base side will form diamond error, leading to uneven force on guide pillars during mold assembly, wear rate increased above 40%.

Machine tool HT300 cast iron base self-weight and damping characteristics determine the vibration absorption capacity during cutting. Processing P20 plate with 150mm thickness, spindle speed set at 650 RPM, feed per tooth taken as 0.12mm. If machine tool rigidity is insufficient, amplitude caused by cutting force exceeds 8 microns, side surface will appear wavy tool marks. At this time verticality tester measured value will jump from 0.01mm instantly to 0.03mm, even producing unrepairable out-of-tolerance.

· Double-head milling machine's automatic probe accuracy needs to reach plus or minus 0.002mm.

· Magnetic chuck's adsorption force must cover above 85% of workpiece bottom area.

· P20 plate placed on magnetic table, 0.02mm iron chips remaining on bottom surface will produce 0.05 degree tilt angle.

· When feed amount from single side 1.5mm drops to 0.3mm, cutting force reduction can make elastic retreat error shrink 60%.

· Using 45 degree entry angle face milling cutter, compared with 90 degree tool, can reduce radial cutting force interference on verticality.

Goniometer induction head fits P20 side, sliding measured verticality value is restricted by environment temperature difference. Factory environment every 1 degree Celsius increase, 600mm length P20 mold base will produce 0.007mm thermal deformation. Verticality calibrated under 22 degrees Celsius constant temperature condition, if moved to 35 degrees Celsius ordinary workshop for assembly, its diagonal length difference will offset 0.04mm. This physical change will cause slider push rod movement stuck, affecting injection cycle.

Machine tool Y-axis and Z-axis verticality geometric parameters at factory time need to be adjusted within 0.01mm/1000mm range. In actual milling P20, height error of cutting overlap area formed by two cutter heads should be less than 0.005mm. Once height difference between two spindles exceeds 0.02mm, side center junction will produce obvious step feel. Even if verticality reading is qualified, subsequent precision grinding process will also increase 2 to 3 hours grinding man-hours.

· Tool blade coating thickness about 4 to 6 microns, verticality accuracy will change drastically due to cutting resistance increase when worn to substrate exposure.

· P20 surface pre-hardened layer thickness is uneven, double-head milling machine spindle power needs to be greater than 15 kW to maintain speed stability.

· Clamping mechanism side pressure must not exceed 5 MPa, preventing thin plate mold base from occurring 0.02mm elastic rebound after unloading pressure.

· Processing large mold base with length exceeding 800mm, flatness error of middle support points should be controlled at 0.005mm.

Workpiece after positioning on magnetic table, infrared probe will scan 4 feature points on reference surface. If blank P20 black skin reservation amount is uneven, left side cutting depth 2mm while right side only 0.5mm, asymmetric radial component force will lead to worktable producing micro-radian offset. This offset on 300mm vertical height, will push side verticality tolerance zone towards 0.025mm range, losing qualification for precision mold base entrance.

Cutting experiment data for P20 show that when cutting linear speed increases to 220 m/min, cutting zone temperature can reach 450 degrees Celsius. At this time if not using oil mist cooling, verticality measurement error caused by local thermal expansion is 30% higher than room temperature. Professional processing flow will vertically place mold base for cooling for 300 minutes after rough milling, waiting for internal thermal stress release then machine again, using 0.1mm precision milling allowance to lock geometric dimensions.

· Servo motor feedback frequency needs to be tuned above 2 kHz, preventing crawling phenomenon during slow speed feeding.

· Guide rail lubrication oil viscosity index selected at No. 68, reducing 0.003mm vertical fluctuation during spindle box movement.

· P20 mold base 4 right angle tolerances need to perform closed-loop measurement, total error must not exceed 0.02mm cumulative value.

· When measuring verticality, marble square ruler accuracy grade must be superior to 00 grade, error band within 0.002mm.

Long-term processing 30 HRC hardness P20 steel, if bearing clearance increases to 0.01mm, tool retreating force during milling will make verticality produce 0.02mm drop between top end and bottom end. Regularly using 0.001mm grade dial indicator to check spindle end face radial jump, is basic operation to maintain mold base side 90 degree relationship, also effective means to avoid assembly error.

· Spindle working 2000 hours later needs to check verticality reference, deviation needs to be corrected within 0.01mm.

· Hot chips produced when cutting P20 are mostly around 0.5mm diameter, need timely chip removal to prevent padding up workpiece.

· Milling cutter head dynamic balance grade should reach G2.5, avoiding high frequency vibration making verticality tolerance zone diverge.

· For P20 module with thickness exceeding 200mm, feed speed needs to drop from 400mm/min to 250mm/min.

High intensity continuous processing will make double-head milling machine column produce thermal displacement. Column tilting back 0.01 degree, reflected on 500mm height workpiece is 0.087mm verticality error. Equipment possessing thermal compensation function can through 12 temperature sensors embedded in bed, real-time adjust servo axis coordinates, pressing down this error to around 0.015mm. This data-level correction, when dealing with large volume steel like P20, is more reliable than manual tool setting.

Operator before clamping needs to use whetstone to trim P20 blank support edges. Even 0.03mm micro burr, under 16000N magnetic compression, will lead to workpiece occurring invisible tilt. After processing completion, use detection rod to perform 5 point sampling in vertical direction, reading deviation should show linear distribution. If numerical value appears fluctuating large and small, usually explains spindle wedge block wear amount exceeds 0.02mm.

· Tool principal lead angle selected at 45 degree can transform vertical cutting force into axial force, protecting verticality.

· Chromium and manganese elements in P20 material are unevenly distributed, leading to cutting resistance fluctuating within 10% range.

· Magnetic table surface every three months needs to perform one 0.005mm grade precision regrinding.

· For workpiece above 400mm height, suggest adding lateral hydraulic auxiliary support to prevent vibration.

Side roughness Ra 1.6 micron is the premise for accurate verticality measurement. P20 steel under high speed cutting easily produces built-up edge, making surface form 0.02mm protruding particles, interfering with dial indicator contact sliding. Keep tool blade rake angle between 15 degree to 18 degree, matching with 20 liters per minute constant pressure cutting fluid supply, can take away above 80% cutting heat, making side at the instant of forming lock within 0.01mm tolerance range.

Parallelism

P20 mold steel under 28-32 HRC hardness shows stable cutting characteristics, but has extremely strict requirements for thickness direction parallelism tolerance. Two 160mm diameter carbide cutter heads synchronously advance on both sides of workpiece, feed per minute maintained at around 300mm. Symmetric cutting offsets above 90% transverse force, making parallelism error within 500mm length stable in 0.01mm range.

Processing 100mm thickness P20 plate, if single side removal amount reaches 3mm, stress released inside material will lead to plate center arching up. Double-head milling machine through two sides equal amount cutting, controls thickness deviation caused by thermal deformation within 0.008mm, preventing uneven subsequent finishing allowance.

Table surface flatness tolerance per 1000mm needs to be controlled within 0.005mm. If chuck surface remains 0.03mm oil stain or fine iron chips, workpiece will produce micro deflection after strong magnetic attraction. Removing magnetic force, plate's elastic rebound will lead to parallelism measured value instantly exceeding standard by above 0.02mm.

· Double-head milling machine X-axis and Y-axis running parallelism set as 0.01mm/1000mm.

· Use 0.002mm grade dial indicator to perform 9 point array measurement on opposite surfaces.

· P20 steel thermal expansion coefficient is at 12.8 times ten to the negative six power level.

· Spindle end face jump needs to be maintained within 0.005mm, avoiding thickness periodic fluctuation.

Mold base processed in 20 degrees Celsius environment, if moved to 32 degrees Celsius assembly room, 1000mm length steel will lengthen 0.15mm. If linear expansion is unevenly distributed on two relative surfaces, parallelism on length direction will appear 0.02mm drift, inducing force offset during injection machine mold closing.

Feed system's ball screw temperature rise needs to through oil circulation cooling device. Continuous running for 8 hours, if screw temperature rise exceeds 5 degrees Celsius, positioning accuracy will produce 0.012mm displacement error. Double-head milling machine through synchronous transmission mechanism, ensures displacement error of two sides cutter heads is at 2 micron level, maintaining thickness consistency.

Cutting linear speed set at 150 meters/minute, matching with 0.15mm feed per tooth. Under this parameter P20 steel surface residual stress is at low position, can prevent parallelism from occurring 0.015mm lag deformation when stored to the next day.

Spindle horizontal synchronicity determines the final quality of parallelism. If left spindle and right spindle exist 0.01 degree deviation in horizontal plane, cut workpiece will present wedge shape thick at front and thin at back. When processing 800mm long mold base, this angle will lead to two ends thickness difference reaching 0.14mm, far exceeding 0.02mm tolerance red line.

Setup Efficiency and Automation

Setup Efficiency

P20 steel hardness maintains at HRC 28-32, this pre-hardened characteristic determines blank enters factory with internal stress. Traditional single-head processing needs person using dial indicator to repeatedly calibrate on four sides, single correcting (finding correct position) time consumption often exceeds 30 minutes. Double-head milling machine through 0.001 degree high precision indexing table rotation, matching with 4 to 8 groups of hydraulic locking units built in base, stabilizes workpiece at center position.

Hydraulic station pressure maintains at around 6.5MPa, ensuring workpiece does not occur micron-level displacement when cutting force reaches 2500N. This solution gives up traditional pressure plate physical blockage, leaving complete cutting avoidance space for double side spindles. Processing 800mm by 600mm specification P20 mold base, worktable can complete all sides processing after single clamping.

· 105 seconds: Time for wireless infrared probe to complete four-point edge finding and automatically update G54 coordinate system.

· 0.008mm: Repeat positioning accuracy error after indexing table rotates 180 degrees.

· 450kgf/square centimeter: Constant locking pressure applied by integrated hydraulic fixture to large mold base.

· 22% to 30%: Standby time consumption reduction of single machine all-day operation after matching with zero-point positioning system.

Double side spindle boxes interior configure constant temperature circulation cooling system, temperature control accuracy locked at plus or minus 0.5 degrees Celsius. Heat produced by P20 steel during cutting process will conduct to spindle through tool tip, thermal compensation function collects sensor data every 500 milliseconds. Controller according to temperature rise curve real-time compensates Z-axis elongation, preventing step textures.

Tool magazine usually presets 160mm diameter disc milling cutters, choosing coated carbide blades to deal with P20's abrasiveness. During double-head milling, power difference between left and right spindles controlled within 5%, avoiding cutting vibration producing resonance frequency. Cutting speed set as 180 meters/minute, when feed rate reaches 1200mm/minute, machine vibration value needs to be lower than 1.5mm/second.

Automation software layer through built-in macro programs, simplifies operator interaction into three parameters: length, width, allowance. System automatically calculates tool cut-in point and retreat path, preventing double spindles from occurring physical interference at extremely narrow gap below 100mm. This parameterized logic saves expensive CAM programming link, ordinary skilled worker can complete new mold base program calling within 15 minutes.

· 0.15mm/tooth: Suggested feed per tooth when rough machining P20 steel, balancing efficiency and life.

· 10mm: Software lock-dead threshold for minimum safety distance during double spindle synchronous processing.

· 300Nm: Spindle motor stable torque quota output under low speed heavy cutting mode.

· 0.01mm: Deviation upper limit of mold base diagonal length tolerance from drawing requirement after precision milling.

Spindle adopts oil-air lubrication technology, bearings still maintain constant oil film pressure under 6000 rev/minute high speed. Aiming at giant P20 mold base up to 2000mm or above, double-head milling machine base cast iron grade usually reaches HT300 or above. This material characteristic can absorb low frequency oscillation produced during cutting process, ensuring side smoothness reaches Ra 0.8 micron.

Blank completes finding correct position at out-of-machine pre-mounting station, transported to machine tool pallet exchange position via RGV. Whole exchange process takes less than 60 seconds, realizing continuous operation without spindle stopping. When dealing with large batch standard mold base orders, this layout makes single machine monthly output increase more than 40%.

Tool monitoring system utilizes acoustic emission sensors to monitor tool breakage risk, if hard points in P20 steel lead to blade chipping, system triggers alarm and stops machine within 10 milliseconds. This closed-loop control eliminates uncertainty of manual inspection, even during nighttime unmanned stage, also can ensure high value mold base does not scrap due to tool abnormality.

· 10 milliseconds: Reaction cycle from tool breakage monitoring system identifying abnormal sound wave to stopping spindle rotation.

· 85HRC: Hardness of nano-grade AlTiN coating on blade surface, specifically against P20's hard wear.

· 3bar: Pressure of center water outlet cooling system spraying cutting fluid, ensuring smooth chip removal in deep groove processing.

· 1.2 tons: Maximum P20 workpiece weight limit that single station pallet can carry.

Maintenance manual requires every 2000 hours running to perform one laser interferometer detection on double-head alignment accuracy. This preventive maintenance ensures geometric relationship between spindles does not drift due to machine tool foundation settlement or environment temperature difference. In actual operation, this management mode lets mold factory's delivery cycle compress from traditional 5 days to within 48 hours.

CNC system interface real-time displays OEE global equipment efficiency dynamic curve, including proportion analysis of non-cutting time and effective cutting time. Management personnel through data terminal monitor real-time load rate of each double-head milling machine. When load is lower than 60%, system will automatically prompt to optimize clamping path, ensuring every second of spindle rotation is creating physical output.

Worktable surface distributes dense T-slots and precision positioning holes, supporting quick machine adjustment for P20 plates of different thicknesses. Even for non-standard size mold bases, operator can complete physical readjustment of fixture position within 5 minutes. This flexibility reduces changeover resistance brought by customized orders.

· 5 minutes: Time to complete worktable fixture position adjustment for non-standard P20 mold base.

· 24 hours: Continuous operation time upper limit of double-head milling machine under automation feeding mode.

· 18 months: Average maintenance-free cycle of high precision spindle bearings under oil-air lubrication system protection.

· 98%: Accuracy rate of top double-head milling machine control system for processing path interference identification.

Cutting fluid system equipped with magnetic separator, specifically absorbing fine iron chips produced in P20 cutting, preventing impurities from scratching already processed mirror surface. Cooling fluid concentration maintains at 8% to 12%, ensuring tool will not occur annealing phenomenon due to dry burning in continuous operation. Efficient chip removal design keeps processing area always clean, reducing downtime cleaning frequency.

Automation

During P20 steel processing, double-head milling machine through built-in industrial IoT module real-time collects spindle current fluctuation. Current collection frequency reaches 1000 times per second, when monitoring cutting load exceeds preset 15 kilowatt threshold, system will automatically lower 20% feed speed. Instantaneous response avoids tool chipping due to hard point impact, ensuring mold base side flatness maintains in 0.015mm range.

Automatic tool change system action only needs 8 seconds, matching with double tool magazines synchronous operation, can accommodate more than 40 disc milling cutters of different specifications. System according to tool tip wear detection data automatically switches backup tools. When flank wear amount of carbide blade touches 0.3mm alarm value, machine tool automatically calls finishing program, guaranteeing P20 mold base chamfer tolerance within plus or minus 0.02mm.

Automation processing unit consists of two double-head milling machines and RGV guide rail. RGV running speed set at 40 meters per minute, repeat positioning accuracy locked at 0.05mm. When sensor detects station processing progress reaches 99%, center control system issues dispatch command. Pallet exchange system through pneumatic interface docks with machine tool, air blowing chip removal pressure constant at 0.6MPa, avoiding chips remaining at positioning pins.

In-machine probe is not only used for initial finding correct position, but also will automatically trigger after each rough processing step. System compares measured data with 3D model, if allowance still exceeds 0.5mm, will automatically add one root clearing path. Closed-loop control logic reduces labor intensity when workpiece flows to next grinding step. Due to eliminating manual intervention, operator configuration ratio of single machine drops from 1 to 1 down to 1 to 4.

Chip conveyor adopts chain plate and scraper combined structure, transporting dry chips amount up to 150 kg per hour. Cutting fluid automatic concentration replenishment system monitors refractive index every 4 hours. If concentration is lower than 10%, proportion pump automatically injects original fluid. Fluid management guarantees lubrication effect during P20 processing, making instantaneous temperature of milling zone decrease about 120 degrees Celsius.

When system detects unit energy consumption abnormally rises 10%, will push maintenance warning through mobile terminal. Data granularity supports factory accurately calculating processing cost of single mold base. Full automatic lubrication system according to screw reciprocating times accurately injects oil, oil injection amount accurate to 0.5 ml per cycle, extending service life of ball screw.

· 200 milliseconds: Time duration for system to process vibration signal from tool monitoring sensor and make reaction.

· 0.7MPa: Constant pressure of spindle center internal cooling system, used to wash away accumulated chips in P20 deep holes.

· 8500 hours: Annual average effective cutting time target value of high performance automated double-head milling machine.

· 12%: Reduction proportion of logistics loss during cross-station flow process after automation schedule optimization.

Operator does not need to open protection door, through built-in 4K camera can observe chip removal state of double-head synchronous cutting. Video stream through gigabit network cable transfers to cloud backend. When algorithm identifies iron chip color turns from silver white to deep purple, system automatically issues overheat alarm, preventing P20 steel surface from producing quenching hard layer.

Engineer even in different location can through dedicated network access machine tool PLC, reading logic status of 128 sensing points. If spindle speed abnormal fluctuation appears during P20 mold base processing, system exports original data packets 10 seconds before and after. Transparent running environment eliminates blind troubleshooting, average repair time for single fault controlled within 2 hours.

Even facing non-standard size mold bases, operator can complete fixture position adjustment within 5 minutes. Flexibility reduces changeover resistance brought by customized orders. Machine tool protection cover adopts steel telescopic structure, can withstand high speed thrown out hot chips impact, improved safety environment around station.

· 50 microns: Minimum cutting fluid impurity particle diameter that automation chip suction system can filter.

· 1.5 times: Tool durability improvement ratio after P20 steel milling under automation support.

· 0.005mm: Real-time closed-loop detection resolution of system for worktable indexing angle.

· 64-bit: Bus architecture bit width adopted by CNC system when processing multi-axis linkage commands.

Maintenance manual requires every 2000 hours running to perform one laser interferometer detection on double-head alignment accuracy. This preventive maintenance ensures geometric relationship between spindles does not offset due to machine tool foundation settlement. In actual operation, management mode lets mold factory delivery cycle compress from 5 days to within 48 hours. Every double-head milling machine undergoes 24 hours full load running test, ensuring hydraulic and electrical system running steadily.