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Fermat's spiral based path planning method and system of bulb cutter with free curved surface

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

Active Publication Date: 2018-11-13
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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  • Fermat's spiral based path planning method and system of bulb cutter with free curved surface
  • Fermat's spiral based path planning method and system of bulb cutter with free curved surface
  • Fermat's spiral based path planning method and system of bulb cutter with free curved surface

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Embodiment 1

[0055] This embodiment discloses a free-form surface ball head tool path planning method based on the 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) Extract 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 spirals are smoothed.

[0059] In described step (1), concrete steps include:

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

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

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

[0063] (1-4...

Embodiment 2

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

[0094] A free-form surface ball head tool path planning system based on a Fermat helix, comprising a memory, a processor, and a computer program stored in the memory and operable 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, which satisfies a uniform residual height constraint;

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

[0097] Smooth the resulting connected Fermat helix subject to the maximum residual height constraint.

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, and when the program is executed by a processor, the following steps are performed:

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

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

[0103] Smooth the resulting connected Fermat helix subject to the maximum residual height constraint.

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

Claims

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Application Information

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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
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