Machining method based on Bezier curve corner smooth transition algorithm

Abstract

The invention discloses a machining method based on a Bezier curve corner smooth transition algorithm. The machining method comprises the following steps: firstly, acquiring discrete data points of the tracks of small line segments by using CAD / CAM software; secondly, reading in three data points, marking a middle point as an inflection point, and calculating the length, the rotation angle and theunit direction vector of micro line segments on the two sides of the inflection point; thirdly, constructing different corner arc transition vector models with G2 continuous characteristics accordingto the value range of the central angle; fourthly, calculating a transition error and a curvature extreme value, determining the positions of transfer points on the two sides of the corner and the length of a transition section according to a preset approximate error constraint and a maximum curvature limit, and substituting the positions and the length into the model to solve a transition curve,thus completing smooth transition of one corner; and fifthly, repeatedly reading in data points, sequentially finishing smooth transition of all corners, and outputting a processing path for realizing smooth connection between small line segments by adopting the transition curves.

Description

Technical field [0001] The invention belongs to the field of mechanical engineering and is mainly applied to CNC machining in the intelligent manufacturing industry. It relates to a path trajectory optimization method used in high-speed machining of small line segments, and in particular to a machining method based on a Bezier curve corner smooth transition algorithm. Background technique [0002] At present, in the fields of aerospace, automobile and ship, and high-end mold manufacturing, for the processing of parts with complex curve and surface modeling, the usual method is to use CAD / CAM software to characterize it as a series of path trajectories of a large number of small line segments and then perform CNC Machining, this method is simple and efficient, has a wide range of applications, a faster tool path generation speed, and is easy to realize offset processing and interpolation, so it is still widely used by most CNC systems. However, the small-line-segment CNC program h...

AI Technical Summary

Problems solved by technology

However, NC programs in the form of small line segments have a large amount of data, error-prone data transmission, frequent acceleration and deceleration can easily cause shocks, and many turning points can easily cause over-cutting and under-cutting, which seriously restricts the development of high-performance manufacturing of complex curve and surface parts.

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