Acceleration and deceleration look-ahead control method for high-speed machining of numerical control machine tool

Abstract

The invention relates to an acceleration and deceleration look-ahead control method for the high-speed machining of a numerical control machine tool. The method comprises the following operation steps of: (1) cutting the curve data of a CAD / CAM (Computer-Aided Design / Computer-Aided Manufacturing) model into a NC (Numerical Control) curve data model according to a contour error; (2) inputting system parameters, such as interpolation cycle T, maximum speed Vmax, and the like, on the basis of a NC code; (3) carrying out microfield integral S-shaped speed planning on the basis of the system parameters and determining the corresponding speed (i is equal to 1:N, N is a look-ahead field number, that is to say, a speed value from the first field to the Nth field is determined) of all fields on a S-shaped speed curve; (4) determining a microfield adapting angle allowed passing speed (i is equal to 1:N); (5) determining a point at which the adapting angle allowed speed is smaller than planned speed; (6) outputting a machining interpolation point; and (7) executing the information and finishing the machining of parts by a motion control system. In the step (5), the reasonable speed at which the microfield machining can be carried out is determined on the basis of comparing the speed on the S-shaped speed curve with the adapting angle allowed passing speed, and thereby, the S-shaped speed curve with highest efficiency is obtained; and finally, the machining interpolation point is output to the motion control system. According to the method, the machining precision is ensured, the machining efficiency is greatly increased, the flexible impact of the machine tool is effectively prevented and the service life of the machine tool and cutters is prolonged.

Description

technical field [0001] The invention relates to an acceleration and deceleration control method for high-speed machining of a numerical control machine tool, belonging to the technical field of numerical control. Specifically, it is a method to calculate an S-shaped speed curve with the highest efficiency under the premise of ensuring the processing accuracy and the speed allowed to pass through the micro-segment junction. Background technique [0002] High-speed and high-precision is the current development trend of CNC systems, and acceleration and deceleration control is one of the core technologies of high-speed CNC systems. [0003] The traditional speed planning method takes each small path as the research object, and guarantees the machining accuracy by assuming that the starting and ending speeds of the path segment are zero. Although this method can ensure the joint point of the tool path, the processing accuracy and speed can meet the requirements for ordinary cur...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems in the prior art that there is a roundness mutation in the speed planning of the numerical control system during the acceleration and deceleration phase, which causes severe mechanical vibration when the numerical control machine tool moves, and the calculation of the acceleration and deceleration planning of the S-shaped curve is complicated, the purpose of the present invention is to provide a method that ensures Acceleration and deceleration forward-looking control method for high-speed machining of CNC machine tools, which greatly improves the processing efficiency and effectively avoids the flexible impact of the machine tool.

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