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Tool path planning method and system for free-form surface ball head based on Fermat helix

A technology of tool path and helical line, which is applied in the field of free-form surface ball head tool path planning, can solve the problems of processing quality to be improved, unfavorable tool life, processing hard corners, etc., achieve uniform residual height distribution, and improve processing efficiency and quality , The effect of prolonging tool life

Active Publication Date: 2019-10-29
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the path planning algorithm of this patent is on a two-dimensional plane, and the path spacing is the same. There are hard corners in the planned path, the processing quality needs to be improved, and it is not conducive to the service life of the tool.

Method used

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  • Tool path planning method and system for free-form surface ball head based on Fermat helix
  • Tool path planning method and system for free-form surface ball head based on Fermat helix
  • Tool path planning method and system for free-form surface ball head based on Fermat helix

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment discloses a free-form surface ball nose tool path planning method based on Fermat helix, such as figure 1 shown, including the following steps:

[0056] (1) For a given connected free-form surface S, calculate a distance scalar field that satisfies the uniform residual height constraint;

[0057] (2) extracting the contours in the scalar field calculated in step 1 to generate connected Fermat spirals;

[0058] (3) Under the constraint of the maximum residual height, the generated connected Fermat spiral is smoothed.

[0059] In the step (1), the specific steps include:

[0060] (1-1) Use the method of Keenan et al. to generate the initial distance field, as figure 2 (a);

[0061] (1-2) Calculate the update field of residual height correlation from the distance field;

[0062] (1-3) Superimpose the update field into the distance field calculation as a heterogeneous description, and recalculate the distance field;

[0063] (1-4) Repeat the iterative...

Embodiment 2

[0093] The purpose of this embodiment is to provide a computing system.

[0094] A free-form ball nose tool path planning system based on Fermat helix, comprising a memory, a processor and a computer program stored in the memory and running on the processor, the processor implements the following steps when executing the program ,include:

[0095] receiving a connected free-form surface, and calculating a distance scalar field that satisfies the uniform residual height constraint;

[0096] extracting contour lines in the distance scalar field to generate connected Fermat spirals;

[0097] The resulting connected Fermat spiral is smoothed under the constraint of maximum residual height.

Embodiment 3

[0099] The purpose of this embodiment is to provide a computer-readable storage medium.

[0100] A computer-readable storage medium on which a computer program is stored, the program executes the following steps when executed by a processor:

[0101] receiving a connected free-form surface, and calculating a distance scalar field that satisfies the uniform residual height constraint;

[0102] extracting contour lines in the distance scalar field to generate connected Fermat spirals;

[0103] The resulting connected Fermat spiral is smoothed under the constraint of maximum residual height.

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Abstract

The invention discloses a Fermat's spiral based path planning method and system of a bulb cutter with a free curved surface. The method comprises the following steps that the communicated free curvedsurface is received, and a distance scaling field which satisfies the uniform residual height constraint is calculated; isopleths are extracted from the distance scaling field, and a communicated Fermat's spiral is generated; and under the constraint of the maximal residual height, the generated communicated Fermat's spiral is smoothed. On the basis of the Fermat's spiral, the communicated free curved surface of any topology can be used to generate the continuous, smooth, regional boundary related precise processing path with uniform residual height distribution for the bulb cutter, and the processing efficiency can be improved on the premise that the processing quality requirement is met.

Description

technical field [0001] The invention relates to the technical field of milling machine finishing path planning, in particular to a free-form surface ball nose tool path planning method and system based on Fermat helix, which is applied to three-axis numerical control milling machine or five-axis numerical control milling machine 3+2 working mode processing Freeform surface. Background technique [0002] Milling machine is a kind of machine tool in Numerical Control Machining that uses milling cutter to process various surfaces of workpieces, which is suitable for processing more complex curved surfaces. The machining process is usually roughing, finishing and root cleaning. [0003] Rough machining generally uses a large-sized milling cutter head to quickly remove most of the blank parts that do not belong to the target shape, and obtain an approximate shape of the target part; the approximate shape is actually an approximate equidistant offset surface of the target part. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/19
CPCG05B19/19G05B2219/35349
Inventor 陈宝权赵海森张皓辛士庆邓园旻屠长河王文平丹尼尔·科恩·奥尔
Owner SHANDONG UNIV