Velocity look-ahead preprocessing method oriented to efficient processing of tiny line segments

Abstract

The invention discloses a velocity look-ahead preprocessing method oriented to efficient processing of tiny line segments. The velocity look-ahead preprocessing method comprises the steps of dynamically and adaptively selecting the number of look-ahead preprocessing segments, and performing optimization preprocessing on the cutting velocity of each look-ahead segment to guarantee a high feed velocity and smooth join; the velocity look-ahead preprocessing method comprises the two steps of adaptive selection of the look-ahead segments and pre-calculation of the optimal join velocity; a numerical control system adaptively selects the look-ahead preprocessing segments by determining the positions of inflection points according to the processing path change trend; according to the path change trend of the look-ahead segments, firstly, the final velocity of each look-ahead segment is roughly estimated, and then the optimal join velocity of each look-ahead segment is accurately planned according to the instruction velocity, the rough estimated value of the final velocity, the accelerated velocity and the segment length constraint of each look-ahead segment. The velocity look-ahead preprocessing method oriented to the efficient processing of the tiny line segments is high in velocity, and capable of realizing efficient and smooth join of the feed velocity to meet the velocity control requirements of high-velocity digital numerical devices.

Description

technical field [0001] The invention belongs to the technical field of numerical control, relates to a speed control technology of a numerical control system, and in particular relates to a speed forward-looking preprocessing method for high-efficiency processing of tiny line segments. Background technique [0002] Complicated surface machining is often approximated by small straight line segments generated by CAM software, the length of which is mostly no more than 1mm (minimum 0.1mm), the total program volume is as many as tens of thousands or even hundreds of thousands of program segments, and the feed rate is as high as 60m / min. Acceleration up to 9.18-2*9.18m / s 2 . The goal of speed-forward preprocessing is to ensure high-speed processing and smooth connection between small line segments, so as to improve the processing efficiency and part processing accuracy of the CNC system. It is of great significance to improve the overall performance of the CNC system to study t...

AI Technical Summary

Problems solved by technology

Some existing processing speed control methods for small line segments mostly use the reading of a fixed number of processing segments, through curve fitting and calculation of the second derivative, and then optimize the speed at high curvature points. These methods require a large amount of calculation. At the same time, the fixed number of segments is difficult to meet the high-speed and stable processing requirements of complex trajectories.

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