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Design method of key geometric parameters of end mill based on machining vibration

A technology of geometric parameters and design methods, applied in the fields of calculation, electrical digital data processing, special data processing applications, etc., can solve the problems of unclear processing environment and processing objects, and it is difficult to exert the vibration isolation performance of milling cutters with different pitches.

Active Publication Date: 2018-07-03
SHANGHAI JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

Some existing commercial milling cutters also adopt variable pitch design to improve processing stability, but the specific processing environment and processing objects are not clear before commercial milling cutters are designed, so it is difficult to use unequal pitch milling cutters The anti-vibration performance is maximized

Method used

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  • Design method of key geometric parameters of end mill based on machining vibration
  • Design method of key geometric parameters of end mill based on machining vibration
  • Design method of key geometric parameters of end mill based on machining vibration

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Embodiment Construction

[0106] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0107] Please also see Figure 1 to Figure 8 .

[0108] Taking the standard equidistant end mill with the same parameters such as length, diameter and material as the modal test object, the modal parameters of the tool-machine tool system were measured;

[0109] Carry out dynamic modeling on the processing system, and establish second-order differential equations with multiple time delays.

[0110]Perform state space transformation on dynamic equations to establish state space equations;

[011...

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Abstract

The invention provides a method for designing key geometric parameters of an end mill on the basis of machining vibration. The method includes the steps that modal testing is carried out on a machining system to obtain key modal parameters; dynamical modeling is carried out on the machining system, and a multi-time-lag second-order differential dynamical equation is established; a converted state-space equation is established; stability of the machining system is judged through a generalized Runge-Kutta (GRK) method, and Lobe graphs, namely stability graphs, in a machining parameter space are obtained; different Lobe graphs are obtained by changing design parameters namely values of tooth pitches and helical angles of the end mill; optimized tooth pitches and helical angles of the end mill are obtained by comparing the Lobe graphs under the condition of different design parameters with a goal of obtaining the maximum machining efficiency. Compared with traditional equal-tooth-pitch standard milling cutter machining, the method has the advantages that dynamic characteristics of the machining system are obtained through the GRK method, the optimized key geometric design parameters, namely the tooth pitches and helical angles, of the end mill are obtained, and machining efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a method for designing key geometric parameters of an end mill based on processing vibration. Background technique [0002] In the field of machining, milling is one of the most common and commonly used processing methods. With the advancement of science and technology, people have higher and higher requirements for milling processing quality, and processing vibration is one of the key factors affecting processing quality. Reducing vibration, especially eliminating the influence of severe vibration or flutter, is an inevitable requirement to ensure processing quality. The causes of chatter include regenerative effect, modal coupling, friction, force-thermal coupling, etc. Among them, regenerative effect is the most important cause of milling chatter. [0003] There are many ways to avoid the regenerative effect, among which the use of unequal pitch milling cutters...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 朱利民丁烨牛金波丁汉
Owner SHANGHAI JIAOTONG UNIV
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