Point vector double-enveloping method for determining tool profile in helical surface generation processing

A helical surface and quadratic enveloping technology, which is applied in the manufacture of helical surfaces and the design and manufacture of helical surface generating tools, can solve the problems of poor versatility of geometric methods, difficult interference processing, complex modeling, etc., to eliminate Overcut and interference phenomenon, easy to program, simple modeling effect

CN105867298AActive Publication Date: 2016-08-17CHONGQING UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-08-17

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Abstract

The invention relates to the field of helical surface manufacture and relates to a point vector double-enveloping method for determining a tool profile in helical surface generation processing. A profile of a gear end section is subjected to point discrete processing according to an averaging criterion, and space vectors of discrete points on a gear surface are added to constitute point vectors; meanwhile, helical motion tracks of the point vectors along the gear surface and rotation generation motion tracks along a gear axis are subjected to discrete processing, the planar point vector double-enveloping method is established, the points, having the shortest directed distance with a grinding wheel, in a two-dimensional point vector group are determined to be enveloping points, and finally, the generation tool profile is formed by all the enveloping points in a fitting manner.
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Description

technical field

[0001] The invention belongs to the field of manufacturing helical curved surfaces, in particular to the field of design and manufacturing of tools for generating and processing helical curved surfaces, and relates to a method for determining the profile of generating tools. Background technique

[0002] Spiral curved surface is the most widely used curved surface in engineering. It is mainly used in gears, worms, spiral blades and corresponding processing grinding wheels. Because the forming method is more intuitive and has the characteristics of high precision, the forming method has become the main method for processing spiral curved surfaces. one of the ways. Most of the existing forming grinding wheels use rotary grinding wheels, and there is a spatial mapping relationship between the forming section of the rotary grinding wheel and the processed spiral surface profile, so the calculated contour accuracy of the forming sand has a great influence on the a...

Examples

Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0023] Taking the standard involute helical gear grinding with worm grinding wheel as an example, the point-vector quadratic envelope method to determine the tool profile in the helical surface generation process includes the following steps:

[0024] 1) Point discretization is performed on the profile line of the end face of the helical gear, and the profile line of the gear end profile is discretized according to the discretization criterion of equal arc length, and a series of plane points evenly distributed on the profile line are obtained.

[0025] 2) According to the geometric characteristics of the spiral surface, the space normal vectors of all the discrete points on the tooth surface are calculated, then all the discrete points and their corresponding normal vectors form a series of point vectors.

[0026] 3) Establish a coor...