S-type acceleration and deceleration control method of numerical control machine tool

Abstract

Provided is an S-type acceleration and deceleration control method of a numerical control machine tool. Firstly, a machining program is input into a numerical control system, a numerical control device obtains necessary data, then a pentabasic nonlinear equation set referred to in S-type acceleration and deceleration control is factorized into two binary nonlinear equation sets and one unitary linear equation according to the shortest time rule and the limiting conditions of speed and accelerated speed, acceleration time and deceleration time meeting requirements are gradually solved through the Newton iteration method and the iteration correction method, then a speed curve is solved, interpolation operation is carried out finally, pulses are output, and the machining tasks of workpieces are completed. According to the method, the complex and tedious operation of existing S-type acceleration and deceleration control can be effectively avoided, and the acceleration and deceleration control method is high in precision, short in solving time, easy to understand and convenient to implement.

Description

technical field [0001] The invention relates to the field of numerical control systems, in particular to an S-type acceleration and deceleration control method for numerically controlled machine tools. Background technique [0002] With the rapid development of technology, the research of open CNC system has become a research hotspot in CNC circles all over the world. However, the current research in this field in my country is relatively backward, especially in the research of acceleration and deceleration control technology. big difference. The feed rate of the CNC machine tool is closely related to the machining accuracy, productivity and surface roughness of the workpiece. The feed rate of the CNC machine tool should be stable and the stop position should be accurate. Therefore, the CNC machine tool system must have the function of acceleration and deceleration control. Now the more popular acceleration and deceleration control is the S-type acceleration and deceleration...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the S-type acceleration and deceleration curve contains 5 unknown quantities of time, and the S-type motion curve whose initial and final speeds are not zero, the acceleration curve will have fourteen situations, and it involves multiple nonlinear equations. The calculation is cumbersome and there is no unified Formula solution method, and these five time unknowns cannot be negative in the acceleration and deceleration time planning, which makes it particularly complicated to solve the time of each stage of S-type acceleration and deceleration control

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