Main shaft following synchronous control method for improving thread turning precision

Abstract

The invention provides a main shaft following synchronous control method for improving thread turning machining precision, and belongs to the technical field of numerical control machining thread turning, and the method comprises the following steps: obtaining thread interpolation information; respectively designing a function relationship between the rotating speed of the main shaft and the feedamount of the feed shaft for the acceleration section, the constant-speed section and the transition section between the acceleration section and the constant-speed section; the feeding shaft is synchronously controlled along with the main shaft; and calculating the feed amount of the feed shaft according to the number of turns of the main shaft encoder relative to the main shaft Z-phase signal reference so as to perform thread machining. According to the method, speed fluctuation of the main shaft in the actual process can be solved, the strong following relation between feeding displacementof the feeding shaft and feeding of the main shaft is adopted, and thread precision and surface machining quality can be achieved under the condition that threads are cut many times.

Description

technical field [0001] The invention belongs to the technical field of numerical control machining thread turning, and in particular relates to a spindle following synchronous control method for improving the machining accuracy of thread turning. Background technique [0002] The numerical control system is the core control device of lathe processing, and thread turning is one of the core applications of lathe processing. For the numerical control system, the precise machining of thread turning is the main indicator of its performance. [0003] NC file is a file used to describe the tool trajectory of CNC machining. Usually, G code is used to describe the tool trajectory. According to the input G code, the CNC system first analyzes the G code through the compiling module to obtain the tool trajectory, and then passes the tool trajectory Planning, speed planning and interpolation discretely generate interpolation points for each interpolation cycle, and finally output the int...

AI Technical Summary

Problems solved by technology

[0006] Due to the multiple machining cycles of the thread, there is a certain distance between the specified depth 1A (2A) and the workpiece in the project, and the fluctuation of the spindle speed leads to inconsistent positions where the tool touches the surface of the workpiece in multiple turning cycles. It becomes more difficult to improve the surface quality of the thread and ensure the processing accuracy of the thread, which may cause invalid teeth and patterns on the surface of the thread

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