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Multi-axis numerical control machining ball-end cutter-axis vector planning method for avoiding interference and flutter

A tool axis vector and interference-avoiding technology, applied in digital control, program control, electrical program control, etc., can solve problems such as inability to guarantee machining stability, achieve the effect of improving reliability and stability, and ensuring machining accuracy

Active Publication Date: 2018-09-11
NANJING UNIV OF TECH
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AI Technical Summary

Problems solved by technology

The final result of the above method can only guarantee interference avoidance, but cannot guarantee processing stability

Method used

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  • Multi-axis numerical control machining ball-end cutter-axis vector planning method for avoiding interference and flutter
  • Multi-axis numerical control machining ball-end cutter-axis vector planning method for avoiding interference and flutter
  • Multi-axis numerical control machining ball-end cutter-axis vector planning method for avoiding interference and flutter

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Such as Figure 1-8 shown.

[0023] A tool axis vector planning method for multi-axis CNC machining with ball-end cutters to avoid interference and chatter, such as figure 1 As shown, it includes the following steps:

[0024] 1) Extract the surface of the workpiece model in CAD / CAM software such as UG NX, divide the surface of the workpiece into triangular meshes, extract the coordinate information of the vertices of the mesh and import them into software such as Matlab to construct the workpiece surface represented by the point set. In the above process, the surface has undergone three conversions, and the effects of each stage are as follows: figure 2 As shown, the point cloud model is finally obtained. Use methods such as equal cross-section and equal residual height to generate machining tool paths, and extract tool contact and tool posi...

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Abstract

A multi-axis numerical control machining cutter-axis vector planning method for avoiding interference and flutter is characterized in that an interference-free cutter axis space at each cutter contactis established according to a spatial positional relationship between a cutter and surface discrete points on a workpiece. Then, a ball-end cutting edge is dispersed along the direction of each interference-free cutter axis, and a cutting stability lobe diagram is constructed. According to the cutting stability lobe diagram, it is judged whether the current interference-free cutter axis causes flutter according to the rotational speed and the cutting depth, and then the flutter cutter axis is removed from the interference-free cutter axis space, and an interference-and flutter-free cutter axis space at each cutter contact is obtained. Finally, the minimum sweeping surface of tool motion and the minimum variance of the angular velocity between adjacent cutter contacts are searched in the cutter axis space to generate a smoothing cutter axis. The method has strong versatility, can avoid interference and flutter at the same time in multi-axis machining, ensures the reliability and stability of the processing process, and improves the surface quality of the processing.

Description

technical field [0001] The present invention relates to a kind of CAD / CAM technology, especially a kind of free-form surface multi-axis numerical control machining technology, specifically a kind of multi-axis numerical control machining ball-end cutter axis vector planning method which avoids interference and chatter. Background technique [0002] Due to its outstanding appearance and hydrodynamic performance, free-form surfaces are widely used in high-tech fields such as ships, energy storage, and aerospace. At present, multi-axis CNC machining is often used to process free-form surfaces. Multi-axis CNC machining provides a variety of tool axis postures for the tool, and the ball-end milling cutter can form a good fit with the machining surface. However, the rich tool axis poses also increase the difficulty of tool axis vector planning. A tool axis vector that does not meet the geometric requirements will cause machining interference, causing overcut or undercut in the ma...

Claims

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Application Information

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IPC IPC(8): G05B19/19
CPCG05B19/19G05B2219/35349
Inventor 刘旭凌祥濮潇楠
Owner NANJING UNIV OF TECH
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