Cutter track compression method based on G2 continuous Bezier curve

A compression method and tool path technology, applied in electrical program control, digital control, etc., can solve the problems of large influence of the number of line segments, low compression ratio, large amount of recursive algorithm calculation, etc., to achieve high data compression rate, control and fitting accuracy. , good real-time effect

Active Publication Date: 2014-03-12
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

There are many defects in this way of describing the curve trajectory based on many continuous small line segments: (1) the approximation error has a great influence on the number of line segments
However, NURBS has some shortcomings: (1) The recursive algorithm has a large amount of calculation, which is difficult to

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  • Cutter track compression method based on G2 continuous Bezier curve
  • Cutter track compression method based on G2 continuous Bezier curve
  • Cutter track compression method based on G2 continuous Bezier curve

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Embodiment Construction

[0045] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0046] like figure 1 As shown, in this embodiment, the method provided according to the present invention includes the following steps:

[0047] - a continuous small line segment screening step, through which the area to be compressed is determined through the continuous small line segment screening step;

[0048] -A fitting step, by which the shape value points in each area are fitted to a 3rd order Bézier curve;

[0049] - an error estimation step, by which accuracy is controlled by said error...

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Abstract

The invention provides a gutter track compression method based on a G2 continuous Bezier curve. The method comprises the following steps of a continuous small-line-segment screening step: regions to be compressed are determined through the continuous small-line-segment screening step; a fitting step: shape value points in each region are fit into a three-order Bezier curve through the fitting step; an error estimation step: the error estimation step is adopted for controlling the precision during the fitting step execution; a transition fairing step: a G2 continuous firing processing path is generated through the transition fairing step. The gutter track compression method has the advantages that the linear cutter path in the numerical control processing code can be compressed into the G2 continuous Bezier curve, each section of Bezier curve only comprises one curvature extreme value point, the data compression rate is high, the whole algorithm does not have the iteration, the real-time performance is good, the estimated error is very similar to the real error, the fitting precision can be effectively controlled, and the method can be applied to the high-speed and high-precision numerical control processing.

Description

technical field [0001] The invention relates to the technical field of mechanical numerical control machining, in particular to a method for compressing a linear tool path in a numerical control machining code into a G2 continuous Bézier curve, in particular to a tool track compression method based on a G2 continuous Bézier curve. Background technique [0002] In the CNC machining of complex curved surfaces, the surface to be processed is converted into continuous straight line segments based on a certain approximation error through the CAD / CAM system, and then the corresponding G01 command is transmitted to the CNC system. There are many defects in this way of describing the curve trajectory based on many continuous small line segments: (1) The approximation error has a great influence on the number of line segments. If the precision requirement is high, the CAD / CAM system must use a large number of small straight line segments to approach the processing path, and the gener...

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Application Information

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IPC IPC(8): G05B19/19
Inventor 毕庆贞王宇晗朱利民丁汉
Owner SHANGHAI JIAO TONG UNIV
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