As we all know, CNC lathes are a new type of processing equipment equipped with CNC numerical control system, servo control system and other control equipment, high-precision feed system, tool magazine and other actuators. In terms of processing form, it is not the same as any machining machine to date. Generally speaking, CNC lathe is a high-precision and high-efficiency processing equipment integrating automatic processing and compound centralized processing. However, there are many factors that affect the final machining accuracy and processing efficiency of the workpiece. This article briefly introduces the reasons for the machining scale error of CNC lathes, and it is expected to be useful to us.
First, the main reason for the formation of workpiece processing scale error
We know that CNC lathes are composed of control system, servo drive equipment, servo motor, mechanical feed equipment, workbench part, and reaction measurement equipment. When the workpiece is processed, after the digital calculation of the CNC numerical control system, the control signal is announced to the servo drive device, the servo motor is driven to rotate, and then the mechanical feed device is handed to the work table to make the relative motion between the workpiece and the tool, and the orientation detection reaction. The device converts the actual relative movement between the workpiece and the tool into an electrical signal response to the CNC numerical control device. The numerical control device compares the commanded indexing amount with the actual transposition amount of the reaction, thereby processing the workpiece that meets the design requirements of the machining program.
However, in the practice of CNC lathes, it is often found that the relative movement between the workpiece and the tool is not completely in accordance with the command value, and the scale of the formed part does not match the design. Thus, the onset of the processing scale error phenomenon is presented. The main reasons for the formation of such problems are: the actual transposition value of the servo motor is consistent with the command transposition value, but the relative movement of the workpiece and the tool does not meet the requirements; the practice transposition value of the servo motor does not match the command transposition value; Machine tool transmission system zero return azimuth error; external interference or pulse loss and mechanical problems caused by several reasons.
