Method for directly generating tool path based on measured data

A tool path and measurement data technology, applied in digital control, instrument, computer control, etc., can solve problems such as scattered, achieve the effect of improving versatility, avoiding cumbersome processes, and ensuring stability

Inactive Publication Date: 2012-07-25
XI AN JIAOTONG UNIV
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Problems solved by technology

For the scattered measurement data, through the offset of the point cloud, combined with the established reference surface, the directional projection method is used to directly generate the tool trajectory of the NC machining, which avoids the complicated surface modeling process in the traditional reverse engineering and solves the problem of reverse engineering. Key Issues in Integration with CNC Machining to Improve Production Efficiency

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  • Method for directly generating tool path based on measured data
  • Method for directly generating tool path based on measured data
  • Method for directly generating tool path based on measured data

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Embodiment Construction

[0026] According to the method for directly generating the tool path of CNC machining based on measurement data in the present invention, the whole generation process is as follows: figure 1 As shown, it specifically includes the following steps:

[0027] (1) Use the method of direct offset point to offset the point cloud surface (that is, the measurement data, which is obtained by measuring the workpiece to be processed by non-contact measurement equipment such as laser interferometer);

[0028] Figure 2c The results of point cloud biasing are shown, where the inner larger points represent the original point cloud and the outer smaller points represent the biased point cloud. Because it is necessary to determine the tool position point information during tool machining during NC programming, that is, the motion track of the tool center; and the tool has a certain volume, the tool position point usually deviates from the curved surface to be processed by a certain distance, ...

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Abstract

The invention discloses a method for directly generating a tool path based on measured data. The method comprises the following steps of: biasing a point cloud curved surface by means of directly biasing points; establishing a reference curved surface according to the shape and size of biased point cloud and planning the tool path on the reference curved surface; projecting a tool path point on the reference curved surface to the biased point cloud so as to obtain initial tool location information by employing a directed projection method; fitting the projection point by using a segmented triple Bezier curve, re-sampling the projection point by employing an equal arc length method to generate a self-adaptive tool path so as to improve the machining precision; and correcting the sampling point by employing point-based local neighboring orthogonal projection to improve to precision so as to obtain the final tool location point information. The numerical control machining tool path is directly generated by the measured data, a complex process of reconstructing a curved surface model is avoided, reverse engineering and a numerical control technique are effectively integrated, the manufacturing efficiency and precision are improved, and automation is conveniently realized.

Description

technical field [0001] The invention relates to the field of mechanical manufacturing engineering, in particular to a method for performing object reverse calculation based on measurement data and a method for optimizing tool tracks in CNC machine tool processing. Background technique [0002] Reverse engineering is an important means to achieve mass production of complex products, quickly absorb foreign advanced technology and realize re-innovation and re-design. With the rapid development of measurement technology and manufacturing technology, especially the technology represented by CNC machine tools, the accuracy of measurement and manufacturing and With the continuous improvement of efficiency, the integration of reverse engineering and CNC machining has become the most potential way for the rapid manufacture of complex products. How to obtain the tool path necessary for NC machining from the original measurement data of reverse engineering has become the key issue to e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/19G05B19/4097
Inventor 张英杰高建民陈富民喻明让张定
Owner XI AN JIAOTONG UNIV
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