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Method for judging system stability in milling

A system stability, milling processing technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of loss of stability of the processing system, scrapping of workpieces, affecting processing accuracy and surface quality of workpieces, etc.

Inactive Publication Date: 2014-12-24
HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

Chatter during processing can cause the processing system to lose stability, affect processing accuracy and surface quality of the workpiece, reduce processing efficiency, and even cause the workpiece to be scrapped

Method used

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  • Method for judging system stability in milling
  • Method for judging system stability in milling
  • Method for judging system stability in milling

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Embodiment Construction

[0027] A method for judging system stability in milling. The method includes the following steps:

[0028] ⑴. Using the chip force experimental device, according to the design of a set of process parameter groups composed of different axial depth of cut, radial depth of cut, spindle speed and feed rate, respectively carry out orthogonal experiment schemes, and obtain a set of cutting force tangential , The experimental data of the radial and axial force components:

[0029] (2) According to the average value of the experimental data measured in the step (1), the average cutting force model and the cutting force coefficient model are established to calculate the average cutting force and the cutting force coefficient. The specific calculations are as follows:

[0030] A. Define workpiece coordinate system XYZ and tool coordinate system X T Y T Z T

[0031] B. (2) Establish the microelement cutting force model of the flat bottom knife:

[0032] ...

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Abstract

The invention discloses a method for judging system stability in milling operation. The stability of a system under a certain group of milling technological parameters is judged by calculating argument variation of a characteristic equation. The method comprises the following steps of (1) acquiring a group of experimental data of component force of tangential, radial and axial force of cutting force; (2) establishing an average cutting force model and a cutting force coefficient model according to an experimental data average measured in an experiment in the step (1), and calculating average cutting force and a cutting force coefficient, wherein C, calculating the average cutting force in a workpiece coordinate system, and D, calibrating the cutting force coefficient; (3) establishing a differential equation for describing a flutter problem of a power system in milling according to the cutting force coefficient obtained in the step (2), converting the equation into a neutral type matrix equation form, and obtaining the characteristic equation by utilizing Laplace transformation; (4) judging the system stability in milling by calculating the argument variation of the characteristic equation according to any group of technological parameters consisting of axial depth of cut, radial depth of cut, a spindle speed and a feed rate. The method has the beneficial effects that the method is simple in calculation, and a new stability judging method is provided for theoretical study of milling.

Description

Technical field [0001] The invention relates to a method for judging system stability in milling in the field of mechanical processing, in particular to a method for judging stability of chatter problems in milling. Background technique [0002] With the continuous improvement of the performance requirements of modern aircraft and spacecraft, high-speed, high-efficiency, and high-precision processing are required for the processing of various overall structural parts. Metal cutting is a complex process involving many disciplines such as elasticity, plastic mechanics, tribology, thermodynamics, material science, and mechanical dynamics. However, one of the most prominent problems in the cutting process is the machining deformation of the workpiece, and chatter is a very important factor affecting the deformation of the workpiece. Chatter during processing can cause the processing system to lose stability, affect processing accuracy and surface quality of the workpiece, reduc...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 杜红母丽华赵灿宋作忠刘玉波石端银
Owner HEILONGJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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