Interpolation type automatically identified interpolation control method

A control method and self-identification technology, applied in digital control, electrical program control, etc., can solve the problems of less calculation and insufficient machining accuracy.

Active Publication Date: 2014-10-01
江苏四方包装纸业有限公司
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Problems solved by technology

[0006] In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a simple uniform B-spline method with a small amount of calculation, adopts an interpolation control method that can automatically identify the type of interpolation, and effectively solves the identification of the type of interpolation. A self-identifying interpolation control method for problems such as segmentation, start-stop, and insufficient machining accuracy

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing and embodiment the present invention is further described, with reference to accompanying drawing:

[0046] like figure 1 , an interpolation control method for self-identifying interpolation types, comprising the following steps:

[0047] The first step is to use the graphic acquisition equipment to take photos of the workpiece, and use the matlab software to process the photos to obtain the processing location point information.

[0048] The second step is to construct a uniform B-spline curve. According to the requirements of spline interpolation and the characteristics of B-spline, the value form of the node vector is:

[0049] U=[-p+1,-p+2,...,0,1,2,...,p] (1)

[0050] where p is the degree of the spline basis function. The calculation formula of the uniform B-spline basis function can be obtained from the recursive formula of the spline basis function, and the specific formula is as follows:

[0051] ...

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Abstract

The invention provides an interpolation type automatically identified interpolation control method. The method comprises the steps that graph collection equipment and matlab software are adopted for obtaining machining position spot information; a group of constant primary functions are constructed according to the B-spline theory, a control point is subjected to inverse calculation, and the curvature change of a machining path is calculated according to the B-spline equalizing parameter theory; the interpolation type of the machining path is automatically identified according to features of the curvature change; a speed limit curve of a spline interpolation section is calculated according to chord errors, a speed limit value obtained according to the chord errors and a given maximum limiting speed are judged, the minimum value is selected, and then a new speed limit curve is formed; a characteristic value of a circular interpolation section and a characteristic value of a linear interpolation section are calculated, and then corresponding interpolation calculation is conducted. According to the interpolation type automatically identified interpolation control method, the interpolation calculation is conducted according to the B-spline theory of the constant primary functions, so that the machining accuracy and efficiency are effectively improved.

Description

technical field [0001] The invention relates to the field of numerical control systems, in particular to numerical control machine tools and other fields involving path planning, and is an interpolation control method for self-identifying interpolation types. Background technique [0002] The core of the CNC system field is the CNC interpolation technology. Compared with the products of some developed countries abroad, China's CNC machine tool technology is still relatively backward, especially in terms of high speed and high precision. China is in the period of industrial transformation. The rapid growth of automobile, steel, machinery, electronics and other industries constitutes a huge demand for CNC machine tools, but there are still many problems in its core technology, that is, interpolation technology. [0003] When processing some complex curves and curved surfaces, the path trajectory of the tool may be a free-form curve, or an arc or a straight line. If only manual...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/4103
Inventor 杨亮亮许守金史伟民
Owner 江苏四方包装纸业有限公司
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