Machining method based on Bezier curve corner smooth transition algorithm

A smooth transition and processing method technology, applied in the direction of comprehensive factory control, manufacturing computing system, electrical program control, etc., can solve the problems of large amount of data, easy impact caused by acceleration and deceleration, error-prone data transmission, etc.

Active Publication Date: 2020-04-24
TIANJIN UNIV
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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, an

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  • Machining method based on Bezier curve corner smooth transition algorithm
  • Machining method based on Bezier curve corner smooth transition algorithm
  • Machining method based on Bezier curve corner smooth transition algorithm

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Embodiment Construction

[0038] In order to further understand the content, features and effects of the present invention, the following embodiments are listed and described in detail with the accompanying drawings as follows:

[0039] See Figure 1 to Figure 10 , A processing method based on the Bezier curve corner smooth transition algorithm, which converts the original processing contour trajectory into a series of discrete data points represented by the continuous small line segment path trajectory; read in three adjacent data points in turn, and mark the middle The point is the inflection point, calculate the length of the small line segment on both sides of the inflection point, the turning angle and the unit direction vector; use Bezier curve to construct the corner arc transition curve model with G2 continuous characteristics; and determine the two corners according to the preset transition error constraint and maximum curvature constraint The coordinate position and transition curve length of the...

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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...

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Application Information

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IPC IPC(8): G05B19/19
CPCG05B19/19Y02P90/30
Inventor 王太勇韩文灯于治强冯志杰彭鹏张凌雷
Owner TIANJIN UNIV
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