Li Zhijun Xing Qihui Zhuo Shicheng: Analyze the setting of the machine parameters of the synchronous axis of the numerical control machine tool SIEMENS8MC numerical control system, and discuss the processing method when the synchronous axis of the machine tool is alarmed.

The SIEMENS8MC CNC system is one of the systems with a large number of CNC machine tools. The 8MC numerical control system is mainly configured for large-scale milling and boring machines in our company. The CNC 5x12m CNC gantry milling machine uses this CNC system. The synchronous shaft beam of the machine tool often fails. The cause of the failure is mostly due to the deviation of the sliding plate from the center of the beam. When the beam moves up and down, the load between the driving shaft and the synchronous shaft is large due to the large difference between the bearing and the driven shaft. It is not easy to produce a deviation. If the difference is greater than the value specified by the machine parameters, an alarm is generated. The following is a detailed analysis of the parameters of the synchronous axis machine parameters and the elimination of the synchronous axis alarm.

The machine data of the synchronous axis in the 18MC numerical control system The machine data N274 is the zero offset between the master axis and the synchronous axis encoder. The parameter setting value varies according to the encoder coupling position between the master axis and the synchronous axis. The machine data N988 is the error value between the master axis and the synchronous axis. The machine data N288 is the set actual value of the synchronous coordinate tolerance.

2 Machine synchronous axis fault alarm When the beam is biased by the mechanical external force or other reasons, the active shaft and the synchronous shaft are deviated, and when the deviation value is greater than the actual value of the synchronous shaft tolerance, that is, the value of the machine data N908 is greater than the value of N288, When the NC526 alarm is issued, the NC526 alarm should be eliminated. First, look at the value of the machine data N288, and then look at the value of the N908. At this time, the value of N908 must be greater than the value of N288 and then the service switch is pulled to the position of 2, the value of the machine data N288 is changed to be larger than the value of N908 by the MDI method, and then the reset button is pressed to eliminate the NC526 alarm. Then slide the machine's skateboard to the side of the beam that is horizontally high. Operate the beam to clamp the release button, relax the beam, and then clamp the beam. At this point, monitor the value of N908. If the above steps are correct, the value of N908 should be zero or close to zero. Then change the value of N288 back to the original value, and pull the service switch to the position of 1, the fault is completed.

Another way to handle the synchronous axis NC526 alarm is to separate the synchronous axis of the beam from the active axis from the 8MC numerical control system using machine data. The OG is used to move the drive shaft to level the beam.

Their definition is: the value of the machine data set by the machine synchronization axis is: set the service switch of the machine tool to the position of 2, and the drive coordinate number when the 12th coordinate is driven by the MDI direction, when the 11th coordinate is driven Drive Coordinate Number Rotor Source Closed Loop Verification Analog Closed Loop B (Recommended BIT Combination) Analog Closed Loop A (Recommended BIT Combination) The pilot command values ​​for all coordinates allow synchronous operation. Tracking operations are allowed. Normal delay when error occurs. Error When it occurs, the values ​​of the above three machine data are set to: At this time, the synchronous and active axes of the machine have been disengaged, then the OG mode is selected, the active shaft is separately moved by micro-motion, and one block is placed on the beam guide. Level, monitor the level, until the level shows the level, stop the operation, then change the value set by N433, N450, N461 to the value set by the machine tool through MDI mode, and finally set the service switch back to the position of 1 The fault is processed.

3 Conclusion Through the processing and analysis of the above faults, you can have a deeper understanding of the machine data setting of the synchronous axis of SIEMENS 8MC numerical control system, and also provide a reference method for the maintenance of synchronous machine shaft faults of CNC machine tools. Similar to the numerical control system with synchronous axis coordinates, when the synchronous axis is out of sync, you can refer to this method for fault processing.

Received H: May 9, 2001 Li Zhijun: Engineer of Heavy Equipment Manufacturing Plant of Yizhong Group Co., Ltd. Xing Qihui: Engineer of the Group's Production Operations Division Shicheng: Engineer of 26 Group of Yizhong Group Corporation

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