Method for smoothing speed of high speed numerical control processing track corner

A technology for processing trajectory and corners, applied in the direction of digital control, electrical program control, etc., can solve the problems of large contour error, speed response, unsatisfactory processing efficiency, and cannot well meet the requirements of high-speed processing, etc., to achieve speed, The effect of ensuring machining accuracy

Inactive Publication Date: 2009-07-22
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method avoids the repeated start and stop of the machine tool to a certain extent, improves the processing efficiency and reduces the impact of the machine tool. Due to the insertion of an extra small arc, the speed response and processing efficiency are still not very ideal when the corner is transitioned, and cannot be very good. Fully meet the requirements of high-speed machining; when the corner is small, the inserted tiny arc cannot well approach the contour at the corner, resulting in a large contour error

Method used

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  • Method for smoothing speed of high speed numerical control processing track corner
  • Method for smoothing speed of high speed numerical control processing track corner
  • Method for smoothing speed of high speed numerical control processing track corner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The two straight-line processing sections S1 and S2 are shown in Fig. 4, since the two processing sections are not on a straight line, an inflection point is formed, and σ is the supplementary angle of the corner of the two processing sections. Assume is the unit vector at the end of the first processing segment S1, is the unit vector at the beginning of the second processing segment S2, then: σ = v 1 → · v 2 → , Therefore: corner 2θ=π-σ. After a deceleration motion with a distance of d, the speed of the processing section S1 drops to zero; assuming that the shortest distance (contour error) from the corner vertex to the transition curve is δ, we can get: d = 2 δ cos θ ...

Embodiment 2

[0024] Straight line processing section S1 and arc processing section S2 such as figure 2 As shown, since the two processing sections are not on a straight line, an inflection point is formed, and σ is the supplementary angle of the corner of the two processing sections. Assume is the unit vector at the end of the first processing segment S1, is the unit vector of the tangent line at the starting point of the second processing segment S2, then: σ = v 1 → · v 2 → , Therefore: corner 2θ=π-σ. After a deceleration motion with a distance of d, the speed of the processing section S1 drops to zero; assuming that the shortest distance (contour error) from the corner vertex to the transition curve is δ, it can be obtained as follows: d = 2 δ ...

Embodiment 3

[0027] Arc processing segment S1 and arc processing segment S2 are as image 3 As shown, since the two processing sections are not on a straight line, an inflection point is formed, and σ is the supplementary angle of the corner of the two processing sections. Assume is the unit vector of the tangent line at the end point of the first processing segment S1, is the unit vector of the tangent line at the starting point of the second processing segment S2, then: σ = v 1 → · v 2 → , Therefore: corner 2θ=π-σ. After a deceleration motion with a distance of d, the speed of the processing section S1 drops to zero; assuming that the shortest distance (contour error) from the corner vertex to the transition curve is δ, it can be obtained as follows: d = 2 ...

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Abstract

The invention relates to a method for smoothing the speed of a high speed numerical control processing track corner in the numerical control processing field wherein, initial speed of a transition curve generation place of the corner is determined according to processing errors of the corner, acceleration and profile; interpolation motions are performed simultaneously through adjacent processing sections under the condition of corner transition according to a space vector theory; a transition curve of the corner transition is synthesized by addition of displacement vectors which are obtained according to interpolations of the adjacent processing sections, thereby speed smoothing transition is realized. The invention simultaneously performs the interpolation motions in the adjacent processing sections under the condition of corner transition; a transition track obtained is continuous and derivable, and speed in the corner transits smoothly and can not be reduced to zero, thereby the speed during the manufacturing process can not start and stop frequently. Simultaneously, transitional initial speed is related to preset allowable processing profile errors, thereby processing precision of the transition track can be guaranteed, and speed smooth transition on the high speed numerical control processing corner is realized.

Description

technical field [0001] The invention relates to a speed control method in the technical field of machine tools, in particular to a speed smoothing method for high-speed numerical control machining track corners. Background technique [0002] High-speed and high-precision machining is an important means for CNC machine tools to improve machining quality and efficiency. In the high-speed operation of the machine tool, the CNC system is required to ensure the stability of the machine tool movement, prevent the large impact load from affecting the processing quality of the parts, and protect the feed system of the machine tool. When the corners formed by adjacent processing sections are large, the motion velocity vector will change too much, which will easily cause a large impact on the machine tool, especially in the case of high-speed processing. At present, the processing of the speed at the corner by the numerical control system is mostly to reduce the feed speed to zero fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/19
Inventor 胡俊何波罗磊
Owner SHANGHAI JIAOTONG UNIV
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