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Multi-axis numerical control machining tool motion planning method based on process system rigidity characteristic

A technology for motion planning and processing tools, which is applied in metal processing, manufacturing tools, metal processing equipment, etc.

Active Publication Date: 2012-02-29
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, current research on tool motion planning for multi-axis machining only considers geometric constraints

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  • Multi-axis numerical control machining tool motion planning method based on process system rigidity characteristic
  • Multi-axis numerical control machining tool motion planning method based on process system rigidity characteristic
  • Multi-axis numerical control machining tool motion planning method based on process system rigidity characteristic

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Embodiment Construction

[0050] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0051] A multi-axis CNC machining tool motion planning method based on the stiffness characteristics of the process system includes the following steps:

[0052] 1) The process system of multi-axis CNC machine tools is investigated, and the main factors affecting the comprehensive stiffness field model of the process system - the weak rigidity of machine tools, workpieces and cutting tools are given, and the comprehensive stiffness field model of the overall process system is established. Since the current general-purpose multi-axis machine tool adopts the serial form, the comprehensive stiffness field model of the entire process system can be established by using the series spring model. The calculation formula of the comprehensive stiffness field model is:

[0053] K=((K 1 ) -1 +(K 2 ) -1 +(K 3 ) -1 ) -1

[0054] Among them, K is the ...

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Abstract

The invention relates to a multi-axis numerical control machining tool motion planning method based on a process system rigidity characteristic. The method comprises the following steps of: establishing a multi-axis numerical control equipment process system comprehensive rigidity model through a Jacques matrix method and a finite element method; establishing a three-dimensional space force ellipsoid according to the rigidity field model; optimizing the cutting feed direction according to the rigidity performance index of all control points by taking the force ellipsoid axial length corresponding to the cutting feed direction at any control point in a complex curved surface as the rigidity performance index; and optimizing the cutter orientationtool gesture according to the rigidity performance index of all control points by taking the shortest force ellipsoid axial length corresponding to the cutter orientationtool gesture at any control point. The invention makes up the defect that only the geometrical condition is considered in the traditional multi-axis machining motion planning, can realize the multi-axis machining tool motion planning based on the comprehensive rigidity characteristics of a multi-axis numerical control equipment process system and the geometric constraint condition, and adds a new method for the large-scale complex curved surface multi-axis numerical control machining motion planning.

Description

Technical field: [0001] The invention relates to the field of multi-axis numerical control machining, in particular to a tool motion planning method for multi-axis numerical control machining. Background technique: [0002] With the development of industries such as national defense, transportation, and energy, more and more basic equipment has put forward more demands on key functional parts such as ship propellers, water turbine impellers, and air compressor impellers. The shape and working surface of this kind of blade-based parts are composed of complex curved surfaces. It is difficult to achieve ideal precision or even impossible to process with three-axis CNC machining tools. Four-axis or five-axis CNC machine tools must be used to complete the processing. However, the role played by these equipment is only a fraction of that of foreign countries, and the low efficiency of CNC machining has become a common problem. [0003] The main reason for the low level of multi-a...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23Q15/00
Inventor 彭芳瑜闫蓉陈威杨建中陈徐兵林森杨军李斌
Owner HUAZHONG UNIV OF SCI & TECH
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