G2 continuous Bezier cutter path smoothing algorithm based on tolerance zone

A smoothing algorithm and tool path technology, used in computer control, instruments, simulators, etc., can solve problems such as poor real-time and locality, and can not guarantee that the longest distance of the spline curve does not exceed the set value.

A smoothing algorithm and tool path technology, used in computer control, instruments, simulators, etc., can solve problems such as poor real-time and locality, and can not guarantee that the longest distance of the spline curve does not exceed the set value.

CN109521731AActive Publication Date: 2019-03-26SHENYANG GOLDING NC & INTELLIGENCE TECH CO LTD
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  • G2 continuous Bezier cutter path smoothing algorithm based on tolerance zone
  • G2 continuous Bezier cutter path smoothing algorithm based on tolerance zone
  • G2 continuous Bezier cutter path smoothing algorithm based on tolerance zone

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Embodiment Construction

[0082] The present invention will be further described in detail below in conjunction with examples of implementation.

[0083] The invention is a G2 continuous BĂ©zier tool trajectory smoothing algorithm based on tolerance zone, and according to the double-bow height error limit, the continuous tiny line segment processing area is identified from the processing path composed of discrete small line segments. For the continuous micro-segment processing area, firstly, local interpolation is performed on the discrete instruction points, and the broken-line processing path is converted into a G1 continuous quadratic rational BĂ©zier curve; then, the weight and connection of two adjacent quadratic rational BĂ©zier curves are adjusted The tangent direction at the point makes the machining path achieve G2 continuity; finally, by establishing a tolerance zone, the quadratic rational BĂ©zier curve that does not meet the accuracy requirements is reconstructed.

[0084] The invention provide...

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Abstract

The invention relates to a G2 continuous Bezier cutter path smoothing algorithm based on a tolerance zone. The algorithm comprises the following steps of identifying a continuous processing area; in the continuous processing area, carrying out local interpolation on discrete command points, and converting a polyline processing path into a G1 continuous quadratic rational Bezier curve; adjusting the weights of the two adjacent quadratic rational Bezier curves and a tangential direction at a connection joint so that a processing path reaches G2 continuity; and reconstructing the quadratic rational Bezier curve which does not satisfy a precision requirement through establishing the tolerance zone. By using the method, real-time performance is good, a generated processing path satisfies G2 continuity and the precision requirement, and processing efficiency can be effectively increased.

Description

technical field [0001] The invention relates to the fitting of parametric spline curves in a numerical control system and the control of fitting precision, and belongs to the technical field of numerical control processing. Background technique [0002] In the NC machining of complex workpieces, the CAM system usually converts the complex graphics generated by the CAD system design into a NC machining path composed of a large number of tiny line segments. If the CNC system directly performs interpolation according to the generated processing path, due to frequent acceleration / deceleration control, it will cause vibration of the machine tool, reducing processing efficiency and processing quality. Some high-end CNC systems such as FANUC and SIEMENS have proposed nano smoothing and compressor technology, the purpose of which is to smooth discrete small line segments to form a smooth spline curve, thereby achieving high-speed and high-precision machining, but these technologies ...

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Application Information

Patent Timeline
26 Mar 2019
Publication
CN109521731A
IPC
G05B19/4103; G05B19/4099
CPC
G05B19/4099; G05B19/4103; G05B2219/33003; G05B2219/34085
Inventors
ćŽæ–‡æ±Ÿ; 李攩