NURBS curve interpolation method with processing path length being known

A processing path and curve interpolation technology, applied in the direction of instruments, computer control, simulators, etc.

Inactive Publication Date: 2017-10-20
FUJIAN UNIV OF TECH
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Problems solved by technology

The traditional acceleration and deceleration method generally adopts the post-acceleration and deceleration control method. The method is to calculate the parameters of the interpolation point first, and then perform speed smoothing on the interpolation point. Due to the special structure of the NURBS curve definition, this method requires Calculate the interpolation point parameters twice, there is a certain error

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  • NURBS curve interpolation method with processing path length being known
  • NURBS curve interpolation method with processing path length being known
  • NURBS curve interpolation method with processing path length being known

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Embodiment Construction

[0098] The invention is a NURBS curve interpolation method with known processing path length. In this method, the processing code expressed by the NURBS curve entered by the user is analyzed by the CNC interpreter to interpret the NURBS curve information, and the curve is segmented according to the geometric characteristics of the curve through offline preprocessing, and the length of the NURBS curve segment, Data such as the head and tail endpoint parameter vectors. Subsequently, five-segment flexible acceleration and deceleration is used to process the speed planning of the NURBS curve, and the acceleration process and deceleration process displacement are calculated according to the five-segment acceleration and deceleration model, and then according to the length of the NURBS curve to be processed, the speed planning is divided into three categories, input After processing the length of the NURBS curve segment, enter the corresponding classification process to obtain the t...

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Abstract

The invention provides a NURBS curve interpolation method with processing path length being known. The method is characterized by calculating acceleration process displacement and deceleration process displacement through a five-phase flexible acceleration and deceleration method; carrying out classification on speed planning types according to the processing path length; calculating total interpolation point number of a NURBS curve with the processing path length being L; calculating feed speed of a current interpolation point; and obtaining interpolation point parameters and coordinate values in each interpolation period. Through acceleration and deceleration processing before interpolation, the method improves processing feed speed to be maximum degree on the basis of meeting machine tool acceleration and deceleration capability; and through acceleration and deceleration processing before interpolation, interpolation point parameters do not need to be adjusted again, such that not only machining precision can be improved, but also high-speed machining is realized.

Description

technical field [0001] The invention relates to a NURBS curve interpolation method with known processing path length. Background technique [0002] High-speed and high-precision machining not only requires the CNC system to have a real-time interpolation algorithm, but also the control accuracy must reach the sub-micron level. The real-time performance of the interpolation algorithm even determines the possibility of high-speed machining. 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. Its code volume is only 1 / 10~1 / 100 of the traditional NC code, which has incomparable advantages over small strai...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/41
CPCG05B19/41
Inventor 聂明星彭晋民胡弛邵明刘石坚
Owner FUJIAN UNIV OF TECH
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