Numerical control machining feed rate programming method based on curve smooth deformation

A technology with smooth curve and feed rate, applied in the direction of digital control, program control, electrical program control, etc., can solve problems such as excessive fluctuation of feed rate, insufficient attention to the smoothness of the feed rate curve, and no effective control. , to eliminate fluctuations, reduce machine tool vibration, improve processing efficiency and processing quality

Active Publication Date: 2015-10-28
DALIAN UNIV OF TECH
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Problems solved by technology

The existing literature does not pay enough attention to the smoothness of the feed rate curve, and the problem of excessive fluctuation of the feed rate has not been effectively controlled

Method used

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  • Numerical control machining feed rate programming method based on curve smooth deformation
  • Numerical control machining feed rate programming method based on curve smooth deformation
  • Numerical control machining feed rate programming method based on curve smooth deformation

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Embodiment Construction

[0034] The technical solutions of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0035] The process flow of the CNC machining feed rate planning method based on curve smooth deformation proposed by the present invention is as follows: figure 1 shown.

[0036]First, the surface processing path is represented by a parameter curve; along the processing path, the position of the sampling point is determined according to the size distribution of the curvature of the curve, and then the number of sampling points is determined; for the given parameter expression path, the machine tool kinematics inverse solution is used to obtain the axes of the machine tool Motion trajectory; use the maximum allowable feed rate value of the set tool nose point as the initial feed rate value at the sampling point, and construct the initial feed rate straight line; determine the feed rate value under the NI constraint ac...

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Abstract

The invention provides a numerical control machining feed rate programming method based on curve smooth deformation, and belongs to the technical field of numerical control machining. According to the programming method, feed rate constraints are divided into neighbor-independent (NI) constraints and neighbor-dependent (ND) constraints. Firstly, the maximum feed rate of the technological requirement is set to be an initial feed rate line, and then a feed rate curve of the neighbor-independent (NI) constraints is obtained through one time of curve smooth deformation. Then a feed rate curve of the neighbor-dependent (ND) constraints is obtained through multiple times of curve smooth deformation via combination of a proportional regulation algorithm. According to the feed rate programming method, a fairing item is added on the basis of curve deformation of pure geometric approximation error constraints so that the obtained feed rate curve has better fairness, fluctuation of the feed rate curve is eliminated to the largest extent and the machining process is ensured to be stable. Objectives that machine tool machining vibration is reduced, machine tool machining is ensured to be stable and component machining precision is enhanced can be achieved so as to possess substantial significance in enhancing machining efficiency and machining quality.

Description

technical field [0001] The invention relates to a numerical control machining feed rate planning method based on curve smooth deformation, belonging to the technical field of numerical control machining. Background technique [0002] CNC machine tools have been widely used in CNC machining of complex curved surface parts. As a key link in CNC machining, feed rate planning plays an important role in completing CNC machining of complex workpieces with high quality, high efficiency and low cost. Due to the non-linear relationship between the Cartesian space and the nodal space, currently available feed rate planning methods for 5-axis CNC machining are limited. The existing literature does not pay enough attention to the smoothness of the feed rate curve, and the problem of excessive fluctuation of the feed rate has not been effectively controlled. Therefore, it is still an unsolved problem to ensure the smoothness of the feed rate curve while realizing the adaptive customizat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/18
CPCG05B19/18G05B2219/35097
Inventor 孙玉文陈剑赵洋任斐徐金亭
Owner DALIAN UNIV OF TECH
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