Method for optimizing fixture height and machining path of double-rotary-table five-axis linkage numerical control machine tool

Abstract

The invention discloses a method for optimizing fixture height and machining path of a double-rotary-table five-axis linkage numerical control machine tool, which comprises the steps of: (1) generating a tool path file; (2) extracting the cutter location value and the cutter axis vector; (3) calculating A-axis rotation angle theta A and C-axis rotation angle theta C of double rotary tables; (4) calculating coefficients; and (5) calculating the optimal fixture height by using the coefficients; therefore, the optimization process of the fixture height and the machining path of the machine tool can be realized. The unnecessary translational motion of a cutter and a machine tool spindle used for installing the cutter on the X axis, the Y axis and the Z axis under the machine tool coordinate system can be avoided to the utmost extent, so that the processing time can be effectively shortened, and worse processing quality and tool collision accident which are caused by excessive local motion range can be avoided.

Description

technical field [0001] The invention relates to the field of multi-axis numerical control machining, and more particularly, to a method for optimizing the height of a fixture and a machining path of a double turntable five-axis linkage numerical control machine tool. Background technique [0002] Multi-axis CNC machining technology is widely used in the processing of complex curved thin-walled parts, especially in the aerospace field, which can efficiently process integral impellers and blades with free-form surfaces. During the multi-axis CNC machining process, the machining tool path can be reasonably planned according to the part geometry and process parameters, and the corresponding tool position path file can be generated. This file needs to be post-processed, that is, according to the machine tool structure, the tool position trajectory is kinematically inversely solved, so that the motion can be decomposed into each axis of the machine tool and converted into NC code ...

AI Technical Summary

Problems solved by technology

Correspondingly, the selection of the post-processing method of the tool position trajectory file directly affects the movement path of multiple axes of the machine tool in the process of CNC machining, and then affects the machining accuracy of the machine tool.

[0003] In 2008, Dein Shaw et al. studied the post-processing optimization problem of the AC table rotary machine tool, and pointed out that the placement of the workpiece has a great influence on the length of the X-axis, Y-axis, and Z-axis motion path obtained after post-processing, and The genetic algorithm is used to optimize the position of the workpiece to shorten the movement path of the machine tool, but the genetic algorithm has a large amount of calculation and can only obtain the global optimal solution with a large probability, and it cannot theoretically explain the relationship between the optimal placement position and the subsequent relationship between path lengths

Under the condition that the feed rate of the CNC machining program is set to be constant, if the height of the fixture of the machine tool is not properly designed, the overall movement of the XYZ axis of the machine tool will increase, prolong the processing time, and the local speed may exceed the response speed of the machine tool, resulting in local processing of the workpiece Deterioration of quality and threat to process safety

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