Cutter location point solving method oriented to triangular mesh curved surface numerical control processing

Abstract

Provided is a cutter location point solving method oriented to triangular mesh curved surface numerical control processing and an application thereof. The cutter location point solving method is applied to a numerically-controlled machine tool and comprises the following processing steps of: (1) constructing a bias triangular mesh model in a numerical control system; (2) performing three dimensional spline curve interpolation on valid vertexes on a triangular mesh surface and fitting a profile curve; (3) enabling a section plane to intersect with the profile curve to obtain a cutter location point; (4) generating and outputting a cutter location locus for processing a curved surface workpiece; (5) placing the workpiece on a processing table and fixing the workpiece by a clamp; (6) activating a cutter from a cutter library and locating a processing starting point; (7) enabling the bulb cutter to perform processing according to the acquired cutter location locus. The cutter location point solving method oriented to triangular mesh curved surface numerical control processing is applied to the numerically-controlled machine tool, may effectively solve the cutter location point without precision loss, prevents an influence of triangular mesh model approximate errors, generates a valid cutter path, and increases the processing accuracy of the numerically-controlled machine tool.

Description

Technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a method for obtaining tool position points for numerical control processing of triangular mesh curved surfaces and its application. Background technique [0002] At present, the expression of the triangular mesh model of the curved surface is very common and is widely used in rapid prototyping manufacturing. Among them, the CL path method is one of the commonly used triangle mesh model tool path generation methods. This method is suitable for the processing of ball-end cutting tools. The main operation is to construct the offset surface of the processing surface, and then use the cross-section plane to obtain the tool position point of the offset surface, which is used in the CNC machining of the CNC machine tool. [0003] The triangular mesh model expresses the shape of the solid model through a series of connected triangular mesh faces, which is different from the comm...

AI Technical Summary

Problems solved by technology

There is a loss of accuracy in the expression of the outline of the triangular mesh model, that is, there is an approximation error a, such as Figure 4 As shown, the intersection point intercepted by the current CL path section method is on the edge of the triangular mesh, such as Figure 5 As shown, due to the influence of the approximation error of the triangular mesh model, there is an approximation error between the intersection point and the effective point, and the current CL path section method directly uses the intersection point of the section as the tool position point, which will affect the machining accuracy of the triangular mesh model

Therefore, the existing CL path method has accuracy problems, and the tool position trajectory of the tool generated by the CL path method has errors, which leads to low machining accuracy and low processing efficiency of CNC machine tools for curved surface workpieces.

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