PLC controls a pace to submit the method of numerical control slip of electric machinery drive

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  • source:NODIE CNC Machining
PLC controller has versatility strong, dependability system of tall, instruction simple, process designing is handy learn easily, master easily, bulk small, maintenance works installation of interface of little, spot is convenient wait for a series of advantages, because this applies extensively in industrial automata. And its pilot the pace applies at modular machine tool into orgnaization of servo of electric machinery open loop the control of numerical control slip on automatic product line, but the control system cost that this unit numerical control system makes this unit reduces leave out 70~90% . In transfer matic of modular machine tool, differ as a result of what machine precision, the setting of slip is different also, install 3 kinds of slip commonly: 1, hydraulic pressure slip, use at cutting the amount is large, 　 of 　 of the; in machining the rough machining working procedure with precision inferior requirement 2, mechanical slip, use in cutting quantity to wait, 　 of 　 of the; in having the semifinishing machining process that machines precision requirement certainly 3, numerical control slip, use at cutting the amount is small, treatment precision asks very tall finish machining working procedure is medium. PLC controller has versatility strong, dependability system of tall, instruction simple, process designing is handy learn easily, master easily, bulk small, maintenance works installation of interface of little, spot is convenient wait for a series of advantages, because this applies extensively in industrial automata. And its pilot the pace applies at modular machine tool into orgnaization of servo of electric machinery open loop the control of numerical control slip on automatic product line, but the control system cost that this unit numerical control system makes this unit reduces leave out 70~90% , the 3~5 that takes up transfer matic controls unit PLC only even the memory of I/O interface and <1KB, in large transfer matic, the cost that can make control a system drops more significantly. The numerical control slip in transfer matic of common modular machine tool uses the numerical control slip that PLC controls a pace to take electric machinery drive the orgnaization of open loop servo that the pace takes electric machinery drive. Use slip of PLC pilot numerical control by can make up alloter of pulse of Cheng controller, round, pace to enter the part such as electric machinery and servo main transfer machinery to comprise into electric machinery driver, pace, see a picture. The methodological 　 of slip of PLC control numerical control 1, journey control: The journey of numerical control slip uses digital control to come true, because the journey direct ratio of slip takes the total corner of electric machinery at the pace, the total corner that should control a pace to enter electric machinery only can, and the total corner direct ratio that the pace enters electric machinery controls pulse at what what input several; because this is OK the pulse that measures affirmatory PLC output according to the displacement of servo orgnaization several: The DL in type of 　 of N= DL/d (1) -- the displacement of servo orgnaization is measured (Mm) , d -- the pulse equivalent of servo orgnaization (Mm/ pulse) 　 　 2, feed speed control: The feed speed of servo orgnaization depends on the rotate speed that the pace takes electric machinery, and the pace depends on into the rotate speed of electric machinery the pulse frequency; of the input because the feed speed that this can ask according to this working procedure, decide the pulse frequency: that its PLC outputs? The Vf in type of 　 of  =Vf/60d (Hz) (2) -- the feed speed of servo orgnaization (Mm/min) 　 　 3, direction of feed of feed direction control is controlled namely the pace enters electric machinery turn to control. The pace enters electric machinery it is OK to change direction through changing a pace to enter electric machinery the electrify order of each winding changes his to inverting direction, the output that the way that also can export through PLC controls signal to change hardware round alloter comes true orderly. CNC Milling