Five-shaft cradle type numerical control machine tool non-deformation cutting three-dimensional geometrical modeling method

A technology of CNC machine tools and 3D geometry, applied in simulators, program control, computer control, etc., can solve problems such as poor modeling accuracy

Active Publication Date: 2016-05-04
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0003] In order to overcome the shortcomings of poor modeling accuracy of existing methods, the present invention pr

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  • Five-shaft cradle type numerical control machine tool non-deformation cutting three-dimensional geometrical modeling method
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  • Five-shaft cradle type numerical control machine tool non-deformation cutting three-dimensional geometrical modeling method

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Embodiment Construction

[0055] refer to Figure 1-3 . The specific steps of the three-dimensional geometric modeling method of the undeformed chips of the five-axis cradle type CNC machine tool of the present invention are as follows:

[0056] 1. The solution of the movement amount of each movement axis of the five-axis cradle CNC machine tool at any instant.

[0057] Given two continuous tool poses of a cradle-type five-axis CNC machine tool, the movement amounts corresponding to each movement axis of the machine tool are [x M,1 the y M,1 z M,1 A 1 C 1 ] = [13.123mm0.833mm42.089mm-0.292rad3.145rad] and [x M,2 the y M,2 z M,2 A 2 C 2 ]=[5.297mm8.674mm42.053mm-0.955rad3.927rad]. Then use the linear interpolation method to calculate the movement amount of each movement axis of the tool at any time between two tool positions according to the following formula.

[0058] X M ...

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Abstract

The invention discloses a five-shaft cradle type numerical control machine tool non-deformation cutting three-dimensional geometrical modeling method, for solving the technical problem of poor modeling accuracy by use of a conventional method. The technical scheme is that first of all, a movement amount of each movement shaft of a five-shaft machine tool in a processing process at any instantaneous time by use of a linear interpolation method; then, performing modeling by use of a two-dimensional contour in which a group of parallel planes are intersected with a cutter and a workpiece, and through combination with a kinematic chain of the machine tool, reducing a space three-dimensional problem to a two-dimensional plane problem; establishing a mathematical expression of an instantaneous cutting edge of the cutter on a selection layer of the workpiece in a work coordinate system; solving an envelope boundary curve and an internal envelope area of the instantaneous cutting edge on each layer of a part at any time; solving a non-deformation cutting shape on the selection layer at the moment by subtracting an envelope area at the moment by use of an envelope area at last moment; and obtaining a three-dimensional non-deformation cutting geometry of the period by stacking all non-deformation cutting shapes generated on all layers of the workpiece. The modeling precision is high.

Description

technical field [0001] The invention relates to the field of five-axis numerical control machining modeling, in particular to a three-dimensional geometric modeling method for undeformed chips of a five-axis cradle type numerical control machine tool. Background technique [0002] Document "LeeSK, KoSL.DevelopmentofsimulationsystemformachiningprocessusingenhancedZmapmodel[J].Journalofmaterialsprocessingtechnology, 2002,130:608-617." discloses a super sampling method based on Z-map, the method first obtains the geometric information of parts from the NC program; then uses The super-sampling method samples the acquired geometric information, and uses the sampling information to mesh the blank; finally, uses the gridded blank and the tool envelope to perform Boolean operations. This method can quickly calculate the material removal rate in the process of processing, and evaluate the processing quality of the processed parts. However, this method does not model the 3D undeforme...

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Application Information

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IPC IPC(8): G05B19/408
CPCG05B19/408
Inventor 陈泽忠邓奇常智勇梅永钢
Owner NORTHWESTERN POLYTECHNICAL UNIV
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