Saltus constrained off-line planning method for numerical control machining feed rate

A technology of feed rate and curve, applied in the field of off-line planning of CNC machining feed rate, to avoid repeated interpolation and ensure quality and accuracy

Active Publication Date: 2014-04-30
DALIAN UNIV OF TECH
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Problems solved by technology

This patent invented an off-line planning method of CNC machining feed rate, which realizes feed rate planning with cutting force or machining surface error as constraints. The invention aims to shorten machining time and improve machining accuracy, and does not involve Jerk constraints. And other issues

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  • Saltus constrained off-line planning method for numerical control machining feed rate
  • Saltus constrained off-line planning method for numerical control machining feed rate
  • Saltus constrained off-line planning method for numerical control machining feed rate

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[0020] The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and technical solutions.

[0021] The flow chart of the off-line planning method of the NC machining feed rate of the jerk constraint proposed by the present invention is as follows: figure 1 shown. According to the chord height difference and the speed limit of each driving axis of the machine tool, the initial feed rate value of each sampling point is obtained. Calculate the sub-axis acceleration value and sub-axis Jerk value at each sampling point, and compare with the set sub-axis acceleration limit value and sub-axis Jerk limit value to determine whether there is an out-of-poor point. If there is an over-difference point, the feed rate value at the over-difference point will be adjusted proportionally. After the proportional adjustment is completed, the curve evolution algorithm is used to smoothly deform the feed rate curve to the ...

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Abstract

The invention belongs to the technical field of computer aided manufacturing, and relates to a saltus constrained off-line planning method for a numerical control machining feed rate. The planning method includes the steps that original feed rate values of all sampling points are obtained according to chord height differences and maximum speed limits of all shafts of a machine tool, and an original feed rate curve is obtained through spline fitting; split axle acceleration values and split axle Jerk values of all the sampling points are calculated and compared with a set split axle acceleration limit value and a set split axle Jerk limit value respectively to obtain out-of-tolerance points, and the feed rate values of all the sampling points in an out-of-tolerance area are multiplied by the same adjustment coefficient to obtain new feed rate values. After proportional adjustment each time, a curve evolution algorithm is used, so that the current feed rate curve is deformed smoothly to new adjusted positions of the sampling points, and smooth transition of an adjustment area and a non-adjustment area is represented. The Jerk constrained feed rates can be planned, and parallel requirements of machining geometric accuracy and machine tool driving characteristics can be met.

Description

technical field [0001] The invention belongs to the technical field of computer aided manufacturing, and relates to an off-line planning method of jerk-constrained numerical control machining feed rate. Background technique [0002] With the development of high-end equipment and products, the requirements for the manufacturing performance of equipment and products are getting higher and higher, and a large number of key components with high processing index requirements have emerged. Therefore, correspondingly, the efficiency and precision requirements of NC machining for these key parts, especially complex curved surface parts, are getting higher and higher. Feed rate planning, as a key link in NC machining, has also been paid more and more attention. The quality of its planning directly affects the efficiency and processing stability of NC machining. At present, adaptive feed rate planning has attracted the attention of scholars, such as: feed rate planning algorithm with...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/416
Inventor 孙玉文赵洋贾振元郭东明
Owner DALIAN UNIV OF TECH
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