As we all know, CNC lathe is a new processing equipment equipped with CNC system, servo control system and other control equipment, high-precision feed system, tool magazine and other actuators. In terms of processing form, it is different from any kind of processing machine tool so far. Generally speaking, CNC lathe is a high-precision and efficient processing equipment which integrates automatic processing and complex centralized processing. However, there are many factors that affect the final machining accuracy and efficiency. This paper briefly introduces the cause of the machining scale error of CNC lathe, which is expected to be useful to us.
The main reason of forming the scale error of workpiece processing
As we know, CNC lathe is composed of control system, servo drive equipment, servo motor, mechanical feed equipment, workbench part, reaction measuring equipment, etc. In the process of workpiece processing, after the digital operation of CNC system, the control signal is announced to the servo drive equipment, which drives the servo motor to rotate, and then passes it to the workbench through the mechanical feeding equipment, so that the relative movement between workpiece and cutter occurs. At the same time, the azimuth detection reaction equipment transforms the practical relative movement between workpiece and cutter into electrical signal and responds to CNC equipment and CNC equipment By comparing the instruction transposition with the reaction practical transposition, the workpieces that meet the requirements of processing program design can be processed.
However, in the practice of CNC lathe machining, it often appears that the relative movement between workpiece and cutter is not completely in accordance with the command value, which results in the discrepancy between the dimension of machining parts and the design. Thus, the processing scale error appears. Generally, the main reasons for this kind of fault are as follows: the practical transposition value of servo motor is consistent with the command transposition value, but the relative movement of workpiece and cutter is not up to the requirements; the practical transposition value of servo motor is not consistent with the command transposition value; the zero return orientation error of machine tool drive system; external interference or pulse loss and mechanical fault.