The application that 3 water chestnut communicate system of drive of servo main shaft to go up in CNC Machining center

  • Time:
  • Click:112
  • source:SHERBURNE CNC Machining
The article turns intelligence system of drive of communication servo main shaft to apply at CNC Machining center, analyse the principle of system of main shaft drive, give out capacity computation and model selection method, the signal connection between system of drive of discussion main shaft and CNC and circuit join method, study the parameter of main shaft is installed, make system of drive of high-powered main shaft gets on machining center reasonable use, in order to satisfy the craft of CNC Machining and precision requirement. System of main shaft drive is the high-power actuator of numerical control machine tool, its function is to accept numerical control system (the instruction of S code speed of CNC) and M code assist functional instruction, drive main shaft undertakes cutting is machined. CNC Machining center has higher control demand to main shaft, ask to wide range infinitely variable speeds comes true on the foundation in ability of large moment of force, strong overload above all, the implementation in asking to changing knife action automatically next decides angle to stop (stop) definitely namely, this makes system of drive of machining center main shaft compares average frequency control system or small-power communication to servo is designed in circuit and run parameter to rectify go up surely have greater difficulty. The drive of main shaft can use communication frequency conversion or communication servo controls fashion 2 kinds, main shaft of communication frequency conversion can infinitely variable speeds but cannot stop definitely, need is additional sensor of position of furnish main shaft, the logistic program that coordinates index of CNC system PMC (to accuse PLC) of the buy inside the system will finish stop speed control and fixed position stop itself of main shaft of; communication servo to be had namely definitely stop a function definitely, the axis of its oneself accuses PLC signal to be able to receive the PMC to CNC system one after another continuously, the program can finish the PMC logic that cooperates forthright to stop fixed position to control definitely, and latter control precision far outclass is former. The article is based on the principle analysis of system of drive of main shaft servo, combine system of SJ-PF of 3 water chestnut to communicate system of main shaft drive to stand in H400 and V400, horizontal the applied circumstance on 2 machining center, discuss characteristic of the tall stability that how uses contemporary intelligence to change drive system, high accuracy and convenient parameter to adjust a function, through reasonable capacity join of choice, circuit and relevant parameter are adjusted, make system of main shaft drive satisfies the craft of machining center and precision requirement. One, system of drive of main shaft of servo of communication of principle of work of system of drive of communication servo main shaft is mixed by electromotor of main shaft driving unit, main shaft detect the whirl of main shaft speed and position 3 parts comprise coder, basically finish control of closed circuit speed, but finish control of closed circuit position when main shaft stops definitely. Because the power of main shaft drive of numerical control machine tool is greater, so main shaft electromotor uses configuration of squirrel-cage induction motor, rotate coder can be installed outside main shaft, OK also with make it of main shaft electromotor a whole, operation of the closed-loop control of main shaft driving unit, vector all reachs control system implementation by processor of in-house high speed signal, its principle block diagram is shown 1 times like the graph. System of the CNC in the graph gives out speed to dictate driving unit dictates this to main shaft driving unit with rotate coder measures the effective rate look that give to compare, via operation of the speed adjuster of digitlization and linkage function generator, get the hope moment of force with current rotor and hope linkage vector part to be compared with photograph of result of operation of real moment of force, linkage again, and receive equivalent dc motivation through operation of adjuster of pitching moment, linkage (two-phase runner shaft coming back is) heft of torsion electric current and heft of excitation electric current are changed enter two-phase dormant shafting, commutation of vector of final classics 2/3 enters three-phase dormant shafting, the three-phase stator electricity that gets frequency conversion plant hopes to be worth, reach IGBT frequency conversion through controlling SPWM drive advocate loop makes laden three-phase electric current follows hope value, with respect to the speed closed-loop control that can finish main shaft. Graph driving unit of main shaft of 3 water chestnut uses the principle block diagram of driving unit of main shaft of 1 communication servo electric current vector controls fashion, it is core with DSP of processor of signal of high speed number, regard implementation as circuit with module of power of large-scale special integrated circuit, high speed, make driving unit has volume small, weight tall, position controls rate of light, operation directional time is short, easily high speed stops definitely wait for a lot of advantage. This driving unit can accept digital rate to give, also can accept imitate speed to give, had had stream, press too, overload, owe pressure, overheat, over- fast the monitoring that waits for multinomial protection and diagnostic function, have communication function, stop parameter and moving parameter setting to be able to pass a PC already definitely beforehand buy is OK also the hand uses an input, the design is compact, use convenient. Driver of this main shaft is in when parking fixed position definitely, do not accept the speed of CNC to command actually, stop definitely according to what set beforehand merely the position, accurate stop the parameter such as speed to finish control of closed circuit position. 2, the capacity choice of system of main shaft drive chooses to be with the capacity of system of drive of main shaft of H400 vertical machining center exemple, show the selection process of capacity of system of main shaft drive. 1, choice condition (1) series of SJ-PF of 3 water chestnut communicates primary election system of main shaft drive, main shaft electric machinery is highest rotate speed is 6000r/min, the biggest rotate speed that torque of main shaft constant outputs is 1500r/min. (2) cutting parameter () of condition of strength of the biggest milling, when workpiece of medium carbon steel of milling of milling cutter of end panel of use high-speed steel, cutting tool diameter is 125mm, rate of the biggest milling is 40m/min. 2, computational main shaft advocate transmission power (1) main shaft sky holds power. The average diameter of journal of bearing of around of main shaft of H400 vertical machining center is 70mm, press type is calculable give main shaft sky to hold power, namely in type: K, the biggest rotate speed that the average diameter;n that C gives priority to journal of axial around bearing for invariable;dm gives priority to axial constant torque to output. Era is worth P0=0 into number.

92kW. (2) main shaft is the largest cutting power. When when main shaft power of the biggest cutting arises for force of the biggest milling, the cutting bear of main shaft. When using work of medium carbon steel of milling of milling cutter of high-speed steel end panel, force of the biggest milling can use next form calculation: Set V=40m/min of rate of the biggest milling, can seek a power of the biggest cutting (3) main shaft advocate the transmission cable length at numerical control machine tool is shorter for transmission power, advocate transmission overall efficiency takes higher numerical value 0.

85, era can get PE=2 into numerical value.

39kW. Regard drive of servo of a complete set of as the system, main shaft driving unit and capacity of main shaft electromotor already had made 3 water chestnut match, according to the design power is more than advocate the principle of transmission power, the model of electromotor of SJ-PF series main shaft that chooses for H400 vertical machining center is SJ-PF5.

5, driving unit model is MDS-A-SPJA-55, the capacity is 5.

5kW, corresponding output power is 3.

7kW, specified rate is 1500r/min, 2 electromotor all are contained inside coder Tibetan type and cooling fan. 3, system of main shaft drive and CNC connector machining center use system of numerical control of the INCON-M40F that accords with industrial PC standard open architecture to make give priority to controller, the main shaft motion that system of this numerical control communicates servo drive system to finish machining center through 1 is controlled, system of drive of 3 servo feed finishs X, y, z 3 feed linkage control of direction, expand through 2 PLC complex logic dominates action of the I/O board machine tool that finish again (include library of management of way of work of numerical control system, handwheel management, knife to change knife, duplex operation automatically to make fixed position of graduation of an exchange, workbench stop to wait for) , logistic control software uses C++ language development, achieve the harmonious administration of each subsystem by the 80586CPU of numerical control system. The machining center that is core with system of INCON-M40F numerical control is electric total construction is like control system the graph is shown 2 times. Graph 2 machining center are electric the total construction that controls a system pursues the 3 connector that give priority to axial drive system. Electrical outlet of terminal of wiring of 9 strong report and 3 signal cable is shared on driver of MDS-A-SPJA series main shaft CN1, CN2, CN3. Terminal of wiring of 9 strong report is respectively: Power source of AC 220V three-phase enters line R, s, t, hand in - straight - make frequency conversion advocate the C of terminal of wiring of resistance of apply the brake of dc side specific power consumption of loop, p, output U of dynamical line terminal to the frequency conversion of power supply of main shaft electric machinery, v, w reachs PE of terminal of screen line wiring. Signal cable CN3 is used at join CNC system and PC, among them SE1, SE2 dictates with the imitate voltage that will accept numerical control system (± 10V) , SYA, SYA, SYB, SYB3, SYC and SYC3 are from main shaft driving unit remands the line of current rate feedback of CNC (6 cent are A, b two-phase each 2, photograph of 0 pulse Z 2) , TX1, RX1, GND is respectively serial send, receive line and ground wire, use at the serial mouth of join PC, the moving parameter that makes main shaft driving unit, accurate stop parameter beforehand set and monitoring of main shaft condition, when moving normally, need not join. CN2 is the standard cable that company of 3 water chestnut offers, with will deliver main shaft coder to be opposite the speed of main shaft driving unit / positional feedback signal. CN1 cable has 40 lines, the axis that basically serves as main shaft accuses PLC signal, be joined the I/O at PMC of numerical control system is nodded, control in order to finish CNC to the condition monitoring of main shaft and movement. There is representative signal to be in CN1: FA, FC, OSSEND, INCW, INCCW, INALM sends the PMC to numerical control system by main shaft driver, deliver the current condition of main shaft driver, namely FA and FC put through state main shaft calls the police, OSSEND indicates main shaft to stop a movement to had reached the designated position definitely, INCW, INCCW, INALM indicates main shaft to be in turning, the;REDAY in invert or calling the police, SRI, SRN, OSS, EMG is sent by the PMC of numerical control system to main shaft driver, deliver CNC to command to the control of main shaft, namely REDAY is signal of be in order, SRI commands to turning, SRN commands to invert, OSS commands to allow to stop, EMG is urgent cease an order. There still are 2 lines SM0 and LM0 on CN1 cable, can join main shaft speedometer and laden list secondhand with ground wire G respectively, the face plate that is used at numerical control machine tool shows. Graph the connector of system of drive of 3 main shaft 4, the parameter of system of main shaft drive is whole decide driving unit of main shaft of series of MDS-A-SPJA of 3 water chestnut to share 384 in-house parameter from SP001-SP384, these parameter need to pass join of hardware of become enamoured condition, circuit and moving function requirement to undertake according to machinery reasonable adjust. When be being debugged actually, some parameter use initiative and acquiescent value, some parameter should fasten the exterior signal wiring of all to close suitably with main shaft, return some parameter by advocate transmission structure and performance demand are firm. Machining center main shaft is debugged in use typical parameter give a demonstration is as follows. SP001: Stop return gain definitely, use acquiescent value. SP004: Stop width of v/arc be on the throne definitely, the setting is 1/16. SP006: Stop decelerate to lead definitely, use acquiescent value. SP007: Stop positional numerical value definitely, if hope main shaft fixed position stops at X ° position, but ° of corresponding setting SP007=x / 360 ° × 4096. SP017: Top speed of main shaft electric machinery, set is 6000. SP019: Speed set is worth add / slowdown time is invariable, set is 30ms. SP025: Main shaft side ages teeth of a cogwheel is counted. SP029: Electric machinery side ages teeth of a cogwheel is counted, the scale of SP029 and SP025 should according to advocate transmission is actual transmission is 1 ∶ than setting 2. SP039, SP040, s0041: Specify model of driving unit capacity, electric machinery and type of resistor of apply the brake of specific power consumption respectively. SP098, SP099, SP100: It is the P of speed return gain respectively, i, d. SP129 ～ SP133: Press number of requirement limits buy, appoint driving unit to accept the input line that place of exterior input signal uses, if pass setting SP129=1, the 19A that can define CN1 brings a foot to regard as stop command OSS to input end definitely. SP178, SP179: Use at speed, load to express scale to adjust. SP141 ～ SP143: Press number of requirement limits buy, appoint driving unit condition to output uses output line. If pass setting SP141=0, the 7A that can define CN1 brings a foot to regard as stop the signal that finish to output end definitely: Through installing SO142=11, the condition monitoring that can define the 7B of CN1 to bring a foot to regard driving unit as be in order outputs end. Return some machines several need are positional setting, be like SP097, this parameter is pressed 2 into make share 16, arrive from the 0th F, among them the 1st combination with the 0th expresses to allow to stop direction of rotation, buy 01 choices square to stop; definitely the 3rd position 1 during expressing to allow to stop servo, main shaft lock decides; to choose coder the 5th times to detect polarity, buy of more than of short duration is buy 0; if 0, criterion SP097=0009H. If the graph is shown 4 times,parameter rectifies the curve of actual measurement of speed of machining center main shaft after deciding. Graph 4a is quickened for main shaft - firm fast (the curve of dynamic rate change to 1000r/min)- decelerate process, speed rise time is about 0.

2s, quantity exceeding tone is less than 0.

The curve of dynamic rate change when 25%; graph 4b gives priority to an axis to make calm angle stop from the stable rate of 1000r/min, the constant speed among the curve paragraph control rate for positional loop, the mark is worn main shaft controls mode to turn into from speed the position controls mode, main shaft falls in normal traversal speed from stop a command to give out to definitely stop fixed position to end to need about definitely 0.

5s, transfer the process is smooth. Function of main shaft static state achieves 3000 ∶ for timing scope 10, without static difference. Graph curve of actual measurement of speed of 4 main shaft carries out a proof, the reasonable set of parameter can develop systematic intelligence to influence harmonious ability, system of driving unit of implementation main shaft, CNC and main shaft electromotor coordinate carry to go, make advocate the static state that transmission has stability, dynamic function. 5, we are in the last word below academic calculative guidance, for vertical, horizontal 2 machining center chose capacity of main shaft system, finished the signal join between system of drive of CNC main shaft, adjusted the in-house parameter of driver of 2 main shaft respectively according to systematic requirement, machining center runs a circumstance to prove: Capacity of main shaft system designs appropriate, signal to join correct, parameter cooperates proper, play gave the intelligence of system of drive of main shaft of 3 water chestnut to change a dominant position, overall the machining performance demand that achieved place to anticipate. CNC Milling CNC Machining