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A Method to Eliminate the Five-Axis Singularity Problem in the Path Planning Stage

A path planning, singular technology, applied in the direction of electrical program control, digital control, etc.

Inactive Publication Date: 2017-02-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems that may exist in the prior art when eliminating five-axis singularities and improve the accuracy and efficiency of five-axis machining, the present invention provides a method for eliminating five-axis singularities in the path planning stage

Method used

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Embodiment

[0082] A typical implementation example of the present invention is as follows:

[0083] 1. The surface of the part to be processed selected in this example is a 3-degree B-spline surface, such as Figure 8 shown. The surface size is about 100×100mm 2 , which is special in that it is raised around and sunken in the middle. When the tool runs from the depression 801 (convex) to the projection 802 (concave) along the tool path on the curved surface, there is a high probability of encountering singularity problems. The parameters of the selected ring knife are: bottom surface radius R 1 =2mm, fillet radius R 2 =1mm, the handle length L=15mm.

[0084] 2. The conventional tool path generation method selected is the equal parameter method. First, 200 isoparametric curves are selected on the above surface as path curves, and 200 tool contacts are sequentially selected on each path curve to calculate the corresponding tool position points, and the local coordinate system informa...

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Abstract

The invention discloses a method for eliminating a five-axis singular problem in a route planning stage. The method includes the steps of inputting curved surface information, cutter parameter information and technique information of a part to be machined; generating cutter paths on a curved surface and meanwhile storing local coordinate system information; converting cutter axis vectors of all cutter location points of any path into C space to obtain a direction curve; judging whether the current direction curve intersects with a taper circle, continuing to detect the next path if the current direction curve does not intersect with the taper circle and otherwise horizontally moving the current direction curve to avoid the taper circle; carrying out back calculation on new cutter location points according to a new direction curve and the correspondingly stored local coordinate system information and continuing to detect the next path; carrying out traversal on all paths to ultimately output a non-singularity five-axis cutter path covering the whole curved surface. The five-axis singular problem is taken into account in the route planning stage, the singular problem can be eliminated on the premise that the cutter location points are not increased, meanwhile cutter contact positions on an original path keep unchanged, five-axis machining efficiency and precision are improved.

Description

technical field [0001] The invention belongs to the technical field of five-axis numerical control machining, and in particular relates to a method for eliminating the five-axis singularity problem in the path planning stage. Background technique [0002] Five-axis machine tools are generally developed on the basis of three-axis machine tools by adding two rotation axes. On the one hand, these two additional rotation axes increase the freedom of movement of the tool relative to the workpiece, expanding the technological range of five-axis machining, making it possible to complete multiple processes with one clamping of the workpiece; on the other hand, the tool can Arranging at any angle relative to the workpiece makes it possible to use non-point cutting tools such as ring knives and flat bottom knives, which improves the precision and efficiency of five-axis curved surface machining. Five-axis machine tools are generally considered to be the only means of processing compl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/19
Inventor 傅建中林志伟贺永沈洪垚
Owner ZHEJIANG UNIV
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