Multi-cycle optimal corner interpolation method based on straight line segments and arc paths

Abstract

The invention relates to a multi-cycle optimal corner interpolation method based on straight line segments and arc paths. The method comprises the following operation steps: (1) discretizing arcs in amachining path into straight line segments based on a specified processing error E; (2) determining corner transition time, corner speed, corner distance and corner acceleration a of each corner according to the maximum acceleration of each driving shaft of a numerical control machine tool, the corner machining precision, the geometrical parameters of the corner of the machining path and the optimization target of realizing the maximum sum of the speed before the corner and the speed after the corner; and (3) carrying out look-ahead processing: adjusting the optimal interpolation parameter ofeach corner to enable the machining speeds of the two ends of each straight line section meet the accessibility requirement. According to the method, the maximum acceleration capacity of each drivingshaft of the numerical control machine tool is fully utilized, the arcs in the machining path are dispersed into the straight line sections meeting the error requirement, the change in the speed direction at the corners is transited by adopting a plurality of interpolation periods, and a more efficient look-ahead processing method is adopted, so that the machining speed of a product is greatly increased.

Description

technical field [0001] The invention relates to the technical field of numerical control processing technology of numerical control machine tools, in particular to a multi-period optimal corner interpolation method based on straight line segments and arc paths. Background technique [0002] At present, when CNC machine tools process complex curved surfaces, they usually discretize the processed surface into a large number of straight line segments and arc paths within the set processing accuracy range. In actual processing, the processing speed and processing accuracy of CNC machine tools are mutually restricted; frequent changes in the processing direction will cause frequent start and stop of the machine tool, limiting the processing speed; at the same time, the vibration generated during the start and stop process will also affect the processing accuracy and surface quality of the processed surface. finish. [0003] Therefore, how to increase the processing speed as much...

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Problems solved by technology

[0005] The above-mentioned existing technical solutions have the following defects: the above-mentioned patent focuses on the interpolation optimization of the corners on the processing path, and does not involve the processing method of the arc path, which is also an important part that affects the processing speed; at the same time Its forward-looking processing adopts the method of backtracking processing, which has a large amount of calculation and has a certain impact on calculation efficiency and real-time processing. At the same time, when interpolating at the corner, the corner transition interpolation time requirement is a natural number of interpolation cycles, and It is necessary to carry out the connection processing of straight line segments and corners

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