Local smoothing method for discrete machining path with controllable error and passing a given tool position

A technology of processing paths and tool points, which is applied in the field of high-speed and high-precision CNC machining, can solve the problems of inability to retain discrete processing path tool point information, loss of original contour feature information, and difficulty in taking into account continuity, etc., to improve kinematics performance Effect
CN107255998BActive Publication Date: 2019-06-25DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Publication Date
2019-06-25

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Abstract

The invention discloses a local smoothing method having controllable errors and capable of passing predetermined cutter location points of a scattering processing path, and belongs to the high speed high precision numerical control processing field. Every corner of the scattering processing path adopts two cubic Bezier curves to be used as transition curves for the smoothing processing, and problems of routine scattering path processing such as low precision and easy speed fluctuation are solved. The concrete position of the control point of the transition curve satisfying a maximum approximation error requirement on a line segment is determined with help of convex hull property. Under conditions of G2 continuity restriction and line segment length restriction, the inverse computation of the control point of the transition curve is carried out. According to the acquired control point, a dual-cubic Bezier curve used for the path smoothing is finally acquired. By adopting the local smoothing method, the G2 continuity of the path after the smoothing is achieved, and by comparing with other path smoothing algorithms, processing precision is guaranteed, and the method can pass the cutter location points used to form the scattering processing path.
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Description

technical field

[0001] The invention relates to a local smoothing method for a discrete machining path with controllable errors and passing through a given tool position point, belonging to the field of high-speed and high-precision numerical control machining. Background technique

[0002] In the field of NC machining, the path used for actual machining is usually a series of tool position points discretized on the theoretical curve tool path according to the given machining accuracy, so these tool position points usually contain the feature information of the original contour. However, due to the discontinuity of the tangent vector and curvature at the connection points of adjacent linear segments of the linear path composed of discrete tool positions, the fluctuation of feed rate and the decline of machined surface quality will inevitably occur. Therefore, the traditional discrete processing path is not suitable for the field of high-speed and high-precision CNC machining...

Claims

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