Curved speed planning method, device and data processing method for NC machining path

A processing path and processing method technology, applied in the direction of digital control, program control, electrical program control, etc., can solve the problems of unusable, forward interpolation speed and position uncontrollable, etc., to achieve real-time guarantee and light calculation Effect
CN104678899BActive Publication Date: 2017-12-15BEIJING A&E TECH
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING A&E TECH
Publication Date
2017-12-15

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Abstract

Curve speed planning method, device and data processing method of numerical control machining path. The present invention provides a curve speed planning method and device based on NURBS curve interpolation, and a numerical control machining path data processing method using NURBS curve interpolation speed planning. Acceleration ai within the parameter step size Ξ”ui on the NURBS curve; compare each acceleration with the maximum allowable acceleration to determine the acceleration sensitive point and sensitive range; determine the middle point of the acceleration sensitive range as the demarcation point for acceleration and deceleration; calculate the speed value of the middle point as the target Speed: Accelerate and decelerate the acceleration sensitive area according to the target speed, so as to obtain the NC machining path data of the planned NURBS curve. The present invention can pre-calculate the interpolation point at which the acceleration exceeds the limit in the deceleration stage, so as to avoid the acceleration exceeding the limit caused by the excessive speed at the end of the acceleration stage.
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Description

technical field

[0001] The invention relates to the technical field of numerical control machining, in particular to a curve speed planning method and device based on NURBS curve interpolation and a numerical control machining path data processing method using NURBS curve interpolation speed planning. Background technique

[0002] In the CNC machining system, CAM (computer Aided Manufacturing, computer-aided manufacturing) software often decomposes complex curves into fine and small line segments, which are used as the interpolation trajectory of the CNC system. In recent years, CAM has gradually used the form of NURBS (non-uniform B-spline) curves to fit complex curves, and sent the parameters of NURBS to the CNC machining system as interpolation data. This can greatly reduce the submission of transmission files, and because frequent acceleration and deceleration are avoided, the processing efficiency is much higher than that of small line segment processing, so NURBS inter...

Claims

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