Tool path generating method for multi-axis machining complex curved surface of constraint circular tool based on motion of machine tool

Abstract

The invention discloses a tool path generating method for a multi-axis machining complex curved surface of a constraint circular tool based on the motion of a machine tool. The method explains by taking head and table five-axes numeric control machine tools as an example and comprises the following steps: firstly, establishing a relation equation between a tool position design variable and tool position data as well as a motion transformation equation between the tool position data and a rotating shaft of the machine tool, and further deducing a relation equation between the tool position design variable and the rotating shaft of the machine tool; secondly, analyzing and discussing the equations, and deducing a formula of solving another two variables by using any two variables in a known equation set, thereby obtaining a tooth position calculation formula for the multi-axis machining complex curved surface of the constraint circular tool; on the basis, giving out the basic principle and the calculation flow of a tooth path generation algorithm for the multi-axis machining complex curved surface of the constraint circular tool. The test result shows that by using the algorithm, great change of the rotating shaft of the machine tool can be avoided, the feed speed of a motion shaft of the machine tool is improved, and higher processing quality of the curved surface can be obtained; the algorithm has certain actual application value.

Description

technical field [0001] The invention relates to a method for generating tool tracks for machining complex curved surfaces by a multi-axis numerical control machine tool, in particular to a method for generating tool tracks for multi-axis machining of complex curved surfaces based on machine tool movement constraints. Background technique [0002] When five-axis machining complex surfaces, due to the poor geometric properties of the surface, such as the normal vector, main direction, curvature, etc. of the surface, it is easy to cause large fluctuations in the generated tool trajectory and sudden changes in the tool axis vector. Even if the ball-end cutter is used to process these surface areas in five axes, it will cause drastic changes in the tool axis vector, which will affect the stability of the machine tool movement, exceed the servo capability of the machine tool feed axis, and increase the nonlinear error in the processing process. Therefore, obtaining smooth tool pat...

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Problems solved by technology

[0007] The above two tool positioning methods are heavily dependent on the geometric properties of the tool contact point on the workpiece surface (such as the normal vector of the surface, the main direction, curvature, etc.), even if the tool position design variables remain unchanged in the local coordinate system, in the workpiece coordinate system Or the tool trajectory in the machine tool coordinate system may also change abruptly or not smooth, which will affect the stability of the machine tool movement, exceed the servo capability of the machine tool feed axis, and increase the nonlinear error in the machining process, etc., which will affect the machining of the workpiece surface. Quality and Processing Efficiency

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