Parallel time domain method for predicating milling chatter stability based on thin-wall part

A technology of stability prediction and milling chatter, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as inability to accurately predict chatter stability in milling of thin-walled parts

Inactive Publication Date: 2017-07-11
NORTHEASTERN UNIV LIAONING
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AI Technical Summary

Problems solved by technology

Current prediction methods cannot accurately predict chatter stability in milling of thin-walled parts

Method used

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  • Parallel time domain method for predicating milling chatter stability based on thin-wall part
  • Parallel time domain method for predicating milling chatter stability based on thin-wall part
  • Parallel time domain method for predicating milling chatter stability based on thin-wall part

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Embodiment Construction

[0089] Such as Figure 1-Figure 6 A parallel time-domain method for milling chatter stability prediction based on thin-walled parts is shown,

[0090] Has the following steps:

[0091] S1. Divide the machining process into several stages, and obtain the modal parameters of the tool and the modal parameters of the thin-walled parts at the beginning of each stage through modal experiments:

[0092] S11. Divide the processing process into 3 stages, stage 0, stage 1, and stage 2. The shape of the thin-walled parts in each stage is as follows figure 2 shown;

[0093] S12. Conduct modal experiments on different shapes of thin-walled parts at various stages,

[0094] Install the knife into the handle. Install the dynamometer on the machine tool platform, because the dynamometer will be installed in the follow-up experiment, so in order to maintain the consistency of the modal data, the dynamometer should also be installed when measuring the mode. Install the vise on the dynamom...

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Abstract

The invention discloses a parallel time domain method for predicating milling chatter stability based on a thin-wall part. The parallel time domain method comprises the following steps: obtaining modal parameters of a cutter and the thin-wall part; establishing a motion differential equation of a thin-wall part milling process on a time domain and discretizing the motion differential equation in one cutter tooth period; establishing a mathematical model which is obtained by discretizing the motion differential equation in one cutter tooth period, so as to obtain milling chatter stability critical axial cutting depths of the thin-wall part under different rotary speeds of a milling cutter main shaft; drawing a chatter stability lobe graph and a three-dimensional chatter stability lobe graph. According to the parallel time domain method disclosed by the invention, the time-varying property of the milling process in one cutter tooth period is considered; in a whole machining process, the time-varying property of all orders of inherent frequency, rigidity and damping ratio of the thin-wall part, and modal states of the cutter and the thin-wall part are considered, so that the milling chatter of the thin-wall part can be more accurately and really predicted; a parallel computing theory is combined, so that the computing time is double shortened along with the increase of a thread count, so that the parallel time domain method has high efficiency.

Description

technical field [0001] The invention belongs to the technical field of stability prediction for milling of thin-walled parts, and in particular relates to a parallel time-domain method based on thin-walled parts milling chatter stability prediction. Background technique [0002] Among the many factors that affect the surface quality of milling and slow down the milling speed, chatter is the most important factor. Unlike ordinary workpieces, thin-walled parts have extremely poor rigidity and are more prone to chatter. Therefore, chatter stability Prediction theory method is of great significance for milling of thin-walled parts. [0003] The milling process is constantly changing within a tooth cycle, and this time-varying nature within the tooth cycle needs to be considered. During the entire machining process, with the material removal and shape change of the thin-walled workpiece, the various stages of the workpiece The natural frequency, stiffness, and damping ratio are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/10
Inventor 敦艺超朱立达王书豪王润琼倪陈兵于嘉鹏温泉杨建宇李虎温雪龙黎柏春
Owner NORTHEASTERN UNIV LIAONING
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