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Milling chatter stability prediction method

A technology of stability prediction and milling chatter, which is applied in complex mathematical operations, instruments, design optimization/simulation, etc., can solve the problems of poor versatility and effectiveness of time-domain stability criteria, and low numerical solution efficiency, etc., to improve The effects of stability prediction accuracy, enhanced universality of criteria, and reduced truncation error

Pending Publication Date: 2021-07-09
HUNAN UNIV OF TECH
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Problems solved by technology

However, such methods generally have low numerical solution efficiency and poor versatility and effectiveness of time-domain stability criteria. Therefore, it is necessary to find a more effective flutter stability prediction method

Method used

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  • Milling chatter stability prediction method
  • Milling chatter stability prediction method
  • Milling chatter stability prediction method

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Embodiment 1

[0035] In order to realize chatter-free milling, this embodiment provides a milling chatter stability prediction method when a vertical milling machine table mills aluminum alloys, especially suitable for the stability prediction of the milling process of a cylindrical milling cutter, which specifically includes the following steps:

[0036] S1. Establish a milling process kinetic differential equation considering the regenerative effect;

[0037] S2. Using the numerical method to solve the milling dynamics differential equation to obtain time domain signals including cutting force, tool tip and workpiece vibration;

[0038] S3. An energy-based method, using Rényi entropy to apply a stability criterion to the time-domain signal obtained from the simulation in S2, to determine whether the machining system is stable under the current cutting conditions;

[0039] S4. Changing the cutting conditions, repeating S1-S3, until the stable lobe map is obtained.

[0040] Specifically, S...

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Abstract

The invention relates to the technical field of high-speed milling, and discloses a milling chatter stability prediction method, which uses Renyi entropy to judge the stability of a time domain signal obtained by simulation, and comprises the following steps: S1, establishing a milling process dynamic differential equation considering a regeneration effect; S2, solving the milling dynamics differential equation by adopting a numerical method to obtain a time domain signal; S3, applying a stability criterion to the time domain signal in the S2; and S4, changing the cutting condition, and repeating the steps S1 to S3 until a stability lobe graph is obtained. The Renyi entropy is used for carrying out stability judgment on the obtained time domain signal, so that the criterion universality is greatly enhanced; the variable-step Runge-Kutta algorithm is adopted to solve the milling dynamics differential equation, the truncation error is greatly reduced compared with the Runge-Kutta algorithm, and the stability prediction precision can be fully improved.

Description

technical field [0001] The invention relates to the technical field of high-speed milling, in particular to a method for predicting chatter stability in milling. Background technique [0002] Milling is an efficient cutting process, which is widely used in aviation, aerospace and automobile manufacturing and other industries. The quality and efficiency of milling are severely restricted by cutting chatter, which refers to a self-excited vibration phenomenon that occurs during the cutting process, which can affect the machining accuracy of the workpiece, reduce the surface roughness of the workpiece, and leave vibration marks on the surface of the workpiece , Reduce the surface quality of the machined parts, and even damage the tool teeth and burn the machine tool spindle. Therefore, the prediction of milling chatter is particularly important. [0003] At present, the commonly used chatter prediction method in the time domain is the numerical solution method, mainly Euler me...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F17/13G06F17/14
CPCG06F30/20G06F17/13G06F17/142G06F2119/14
Inventor 李忠群肖检冬张伟峰刘鸿志刘学段林升刘浪
Owner HUNAN UNIV OF TECH
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