Box of CNC Milling main shaft glides suddenly of breakdown eliminate
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1 machine tool holds the machine tool of electric control principle of brake in the arms to use GSK990M open loop to control numerical control system, electric machinery of Z axis servo heads unit of the apply the brake that hold brake in the arms, the working power supply that embraces brake is DC24V, be controlled through exterior contactor, relay and not be built-in control of numerical control system, hold brake in the arms to get report to open, break report to hold firmly. The weight equalizer after the main shaft box on Z axis passes chain and lathe bed is linked together and main shaft box and balance a weight to comparative, the signal that hold brake in the arms is the significant step that gravitational axle control glides, get ready servo signal to serve as a requirement that adopts brake to open normally. Theoretic, should hold brake signal and drive of servo electric machinery in the arms to make only can the sequential of signal accords with control requirement, in switch on the mobile phone, treatment process cuts off the power suddenly or encounter urgent when stopping a circumstance, although because the delay time of laden movement also won't glide substantially,hold brake signal in the arms. 1.
The CNC Milling of breakdown analysis of 2 machine tools passes use of two years, in machine respect, lever of the brake that hold brake in the arms, chain wheel, silk, slideway because mechanical wear causes attrition force decrescent, box of meeting generation main shaft and balance piece appear lopsided condition, the line that the reason that at the same time box of generation main shaft glides still has control servo electric machinery to adopt brake device designs parameter of unreasonable, system to install type selecting of unreasonable, electric machinery undeserved (brake is rated pitching moment slants small) etc cause. Because the machine tool is electric,the CNC Milling that article place alludes is circuit design is unreasonable cause a machine tool to be encountered in switch on the mobile phone or machining a process when parking position urgently, main shaft box (Z axis) occurrence instant glides downward. From the control line of the machine tool the road can see, the machine tool is in when switching on the mobile phone, hold brake in the arms to get report to be opened immediately, and servo driver from the delay time with get report to need to drive of servo electric machinery proper, appeared to hold brake in the arms to get the time of drive of electric machinery of servo of electric time lead so, because gravity glides,cause main shaft case; Encounter when the machine tool when parking position urgently, hold brake in the arms to be in so that report opens position, servo electric machinery does not have excitation, because gravity is inertial,cause main shaft case likewise glide. 2, the settlement of the improvement of circuit and breakdown 2.
1 machine tool is in when switching on the mobile phone, main shaft box (Z axis) occurrence instant glides downward the 1 NC of graph of means of settlement of breakdown and servo electrify graph of the machine tool before drive and circuit of the control that hold brake in the arms improve 3 servo of 2 servo electrify and graph of circuit of Z axis apply the brake switch on the mobile phone process, relevant circuit sees a picture 3[2] of 1 ～ graph. Working process: KA coil gets relay of → of machine tool electrify report (not have stop urgently, when exceeding Cheng and position of electric machinery overload) KA2 coil gets relay of → of the → NC that start report locks up → relay oneself KA3 coil gets coil of KM1 of electric → contactor, KM2, KM3, KM4 to get report (contactor KM2, servo driver gets report to make servo electric machinery incentive because of contactor KM3, generation moment of force prevents main shaft box to glide. But because sequential is not synchronous, electric machinery holds brake in the arms (outside accuse) report opens electric machinery of time lead servo to produce incentive time (about 1 second) , cause instant of main shaft box to glide downward. The principle that circuit improves: Adjust electric machinery to hold brake in the arms to get report and the sequential with incentive electric machinery, make hold brake in the arms to get report to open time lag electric machinery to get report 2 seconds, hold brake in the arms to get report to open delay time the regular job that 2 seconds do not affect a machine tool. Improve circuit to see a picture 4 with the graph 5, with time relay KT1 (model: WENJI-3) replace contactor KM4, set delay time 2 seconds. Switch on the mobile phone process, KA2 coil gets relay of the NC → that start report locks up → relay oneself KA3 coil gets relay of KM1 of electric → contactor, KM2, KM3, time KT1 coil gets electric machinery of axis of electric → Z to because KT1 is moved,hold brake in the arms agree contact delay time 2 seconds get report to open, servo driver gets report to make servo electric machinery incentive because of contactor KM3, generation moment of force prevents main shaft box to glide. Graph electrify of the 4 servo after improving and Z axis apply the brake pursue drive of the 5 servo after improving and of the control that hold brake in the arms 2.
2 machine tools are encountered in machining a process when parking position urgently, occurrence instant of main shaft box glides downward the machine tool before the circuit of means of settlement of breakdown is improved encounters what park position urgently to switch on the mobile phone process, see graph 1 NC and servo electrify circuit, electrify of graph 2[1] servo and circuit of Z axis apply the brake, with drive of servo of graph 3 [1] and circuit of the control that hold brake in the arms. Working process: Encounter when the machine tool when stop urgently or coming up against spacing switch, KA1 coil breaks relay KA3 coil breaks electric → relay coil of KM3 of electric → contactor breaks driver of electric → servo to break phone, servo electric machinery does not have drive, lose traction. Meanwhile, in the relay when stopping urgently because of the machine tool KA2 still gets report namely NC still is in coil of KM1 of contactor of → of the condition that start, KM2, KM4 (relay of time of the following instead KT1 coil) still maintain so that electric → electric machinery holds brake in the arms to still be in open position, the machine tool in machining a process so is encountered when stop urgently or coming up against spacing switch, electric machinery holds brake in the arms to be in open position, electric machinery loses traction without excitation again, main shaft box produces the instant to glide downward because of gravitational and inertial meeting phenomenon. The principle that circuit improves: Controlling time relay KT1 coil (former contactor KM4) relay of the series connection in circuit of KA1 move close contact, see the picture after improving 4 with the graph 5. Working process: Encounter when the machine tool when stop urgently or coming up against spacing switch, KA1 coil breaks relay KA3 coil breaks electric → relay KT1 coil breaks coil of KM3 of electric → contactor and time relay coil of KM3 of electric → contactor breaks report to cause servo driver to break phone, servo electric machinery loses traction without excitation, KT1 coil breaks time relay report causes electric machinery to hold brake in the arms to hold firmly, because gravitational and inertial generation glides downward for an instant,prevent main shaft box. 3, epilogue uses CNC Milling of open loop pilot, as a result of the machine tool electric circuit designs box of unreasonable generation main shaft (Z axis) in switch on the mobile phone and machine a process to encounter the trouble that when stopping urgently, glides suddenly, the author undertakes improvement to dominating the electric line that adopts brake, what settle main shaft case effectively is abrupt glide problem, removed safe hidden trouble, saved facility plant to ask to change for the company the high cost that controls a system.