Curve velocity planning method and device, as well as numerical control machining path data processing method

A processing path and processing method technology, applied in digital control, program control, electrical program control, etc., can solve the problems of uncontrollable and unusable forward interpolation speed and position, and achieve light calculation and real-time guarantee Effect

Active Publication Date: 2015-06-03
BEIJING A&E TECH
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Problems solved by technology

Since the interpolation starts at the same time in both directions, if the forward interpolation needs to wait for more than one cycle of the reverse interpolation in actual processing, the speed and position of the forward interpolation will be uncontrollable, so this algorithm cannot be used in this case

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  • Curve velocity planning method and device, as well as numerical control machining path data processing method
  • Curve velocity planning method and device, as well as numerical control machining path data processing method
  • Curve velocity planning method and device, as well as numerical control machining path data processing method

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Embodiment Construction

[0028] In order to describe in detail the technical content, structural features, achieved objectives and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0029] The following will first explain the basic principles of the NURBS curve interpolation algorithm:

[0030] 1. The NURBS curve is a piecewise polynomial curve, usually written in the form of a one-variable function about the parameter u:

[0031] C → = X i = 0 n N i , n ( u ) w i P → i X i = 0 n N i , n ( u ) w i - - - ( 1 )

[0032] Among them, p is the order (the highest degree of polynomial), P i Is the control point (the Cartesian coordinates of the polygon limiting the shape of the curve), w i Is the weight (the degree to which the curve is attracted by the control points), u i Is the node (parameter ...

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Abstract

The invention discloses a curve velocity planning method and device, as well as a numerical control machining path data processing method, and provides an NURBS curve interpolation-based curve velocity planning method and device, as well as a numerical control machining path data processing method employing NURBS curve interpolation velocity planning. The processing method comprises the following steps: acquiring numerical control machining path data with an NURBS curve, and acquiring acceleration ai within a parameter step length deltaui on the NUBRS curve; comparing the acceleration with maximum allowable acceleration to determine acceleration-sensitive points and an acceleration-sensitive interval; determining a midpoint of the acceleration-sensitive interval as an acceleration and deceleration dividing point; calculating a velocity value of the midpoint as target velocity; performing acceleration and deceleration planning on the acceleration-sensitive interval according to the target velocity to obtain numerical control machining path data with a planned NURBS curve. According to the methods and the device, interpolation points at which acceleration exceeds a limit in a deceleration stage can be calculated in advance, so that the condition that acceleration exceeds the limit due to the fact that velocity at the end of an acceleration stage is excessively high is avoided.

Description

Technical field [0001] The invention relates to the technical field of numerical control processing, in particular to a curve speed planning method and device based on NURBS curve interpolation and a numerical control processing path data processing method using NURBS curve interpolation speed planning. Background technique [0002] In the CNC machining system, CAM (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 NURBS (non-uniform B-spline) curves to fit complex curves, and sent NURBS parameters to the CNC machining system as interpolation data. This can greatly reduce the submission of transmission files, and because it avoids frequent acceleration and deceleration, the processing efficiency is much higher than that of small line segment processing, so NURBS interpolation is becoming the mainstream trend of CNC proce...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/4103
CPCG05B19/4103G05B19/416G05B2219/34141G05B19/19G05B2219/37347
Inventor 庞华冲
Owner BEIJING A&E TECH
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