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NURBS curve direct interpolation flexible acceleration and deceleration control method

An acceleration and deceleration control, acceleration and deceleration technology, applied in the direction of digital control, program control, electrical program control, etc., can solve problems such as machine tool shock, and achieve the effect of improving machining accuracy, delaying machine tool life, and reducing shock

Inactive Publication Date: 2017-10-24
FUJIAN UNIV OF TECH
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AI Technical Summary

Problems solved by technology

[0010] The S-type acceleration and deceleration method is a flexible acceleration and deceleration method, but its jerk is a constant value, and the maximum jerk step is 2 times the maximum jerk, which will cause a greater impact on the machine tool

Method used

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  • NURBS curve direct interpolation flexible acceleration and deceleration control method
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  • NURBS curve direct interpolation flexible acceleration and deceleration control method

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Embodiment Construction

[0056] The invention is a NURBS curve direct interpolation flexible acceleration and deceleration control method. In this method, the CNC interpreter program reads the processing code file expressed by the NURBS curve input by the user, and obtains the number p of the NURBS curve and the control point P i (i=0,1,...,n), and its corresponding weight factor w i Relevant parameters such as (i=0, 1,..., n) and other related parameters are formed by the NURBS curve expression to form the processing NURBS curve; scan the curve to obtain the set of speed sensitive areas of the curve, and then process all the speed sensitive areas of the curve to obtain The speed minimum points in each speed sensitive area of ​​the curve are collected, and then the curve is divided into several curve segments by the speed minimum points; the curve segment is controlled by flexible acceleration and deceleration, and the corresponding interpolation point of each interpolation cycle is obtained, that is,...

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Abstract

The present invention provides an NURBS (Non-uniform Rationa1 B-spline) curve direct interpolation flexible acceleration and deceleration control method. The method comprises the following steps: reading a processing code file, and extracting related parameters of an NURBS curve; performing preprocessing of the NURBS curve, and obtaining the geometric features of the NURBS curve; and obtaining the interpolation points according with acceleration and deceleration features through adoption of the flexible acceleration and deceleration method. The NURBS curve direct interpolation flexible acceleration and deceleration control method reduces the impact on a machine, avoids causing motor shocking, loss of synchronism and the like, improves the processing precision and prolongs the service life of the machine.

Description

【Technical field】 [0001] The invention belongs to the technical field of numerical control machining, and in particular relates to a NURBS curve direct interpolation flexible acceleration and deceleration control method. 【Background technique】 [0002] Non-uniform rational B-spline (Non-uniform Rationa1 B-spline, NURBS) curve has good shape expression ability, and it is more and more widely used in the modeling design and manufacturing of automobile, aircraft, shipbuilding and other surface parts, and has become a STEP curve. -The only form of expressing free curved surfaces in NC. The processing file code expressed in NURBS form is concise, and there is no loss of precision, and its code volume is only that of the traditional NC code It has incomparable advantages over tiny segment straight lines. However, if the CNC system can support NURBS curve interpolation, a NURBS curve interpolator must be constructed first, and the interpolation speed and accuracy are directly af...

Claims

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Application Information

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IPC IPC(8): G05B19/416
CPCG05B19/4166G05B2219/34169
Inventor 聂明星彭晋民胡弛邵明刘石坚
Owner FUJIAN UNIV OF TECH
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