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A method of predicting impeller flutter

A technology of impeller and flutter, which is applied in special data processing applications, instruments, electrical digital data processing, etc. It can solve the problems of inability to predict the stability of milling processing, and does not consider the change of workpiece transfer function, so as to achieve the effect of improving accuracy

Active Publication Date: 2018-05-04
NORTHEASTERN UNIV LIAONING
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Problems solved by technology

These scholars also did not consider the continuous change of workpiece transfer function with material removal, and the resulting impact on the accuracy of milling stability prediction
Therefore, the previous prediction method cannot accurately predict the stability of the current milling process in real time during processing.

Method used

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  • A method of predicting impeller flutter
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  • A method of predicting impeller flutter

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Embodiment Construction

[0039] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] In this embodiment, the impeller of titanium alloy TC4 is taken as an example. The selected cutting conditions are: the spindle speed is 800rpm, the feed speed is 96mm / min, the cutting depth is 1mm, and the length of the clamping part of the impeller workpiece is 30mm. Choose a ball end milling cutter, semi-contact up milling method, and take 15mm as the axial length of a processing sub-stage in the axial direction of the milling cutter.

[0041] A method for predicting impeller flutter, such as figure 1 shown, including the following steps:

[0042] Step 1: Establish a solid model of the impeller, use the finite element analysis method to mesh the solid model of the impeller, and obtain the finite element model of the impeller.

[0043] In this embodiment, CAD is used for solid modeling of the impeller. Generally, for thin-walle...

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Abstract

The present invention provides a method for predicting impeller flutter. The method is as follows: using the finite element analysis method to mesh the solid model of the impeller, dividing the impeller processing process into several processing sub-stages, and using the finite element analysis method to solve the problem. The modal parameters of each machining sub-stage of the impeller are obtained, and the transfer function of each machining sub-stage of the impeller is established. The experimental modal analysis method is used to obtain the modal parameters of the tool system and the modal parameters of the impeller system, and the transfer function of the tool-impeller system is established. ; Calculate the difference between the modal parameters of each processing sub-stage of the impeller and the modal parameters of the impeller system obtained by the experimental modal analysis method, obtain the modal parameter deviation vector, and use the modal parameter iteration function to calculate the modal parameter deviation vector Through iteration, the final modal parameters of each processing sub-stage with the modal parameter deviation vector within the modal parameter tolerance range are obtained, and the milling stability lobe diagram of each processing sub-stage of the impeller is drawn.

Description

technical field [0001] The invention belongs to the technical field of impeller machining stability prediction, and in particular relates to a method for predicting impeller flutter. Background technique [0002] Chatter stability prediction method is a very important theoretical method in milling process. It can effectively avoid the deterioration of the machined surface quality caused by regenerative vibration during milling, making it possible to process parts without chatter; thus effectively improving the efficiency and surface quality of milling. [0003] Currently, the use of stability lobe maps is an effective method for predicting milling chatter. The method is based on the system transfer function to establish the relationship between different spindle speeds and the axial depth of cut, and the axial limit depth of cut is used as the stability boundary condition. Since the stiffness of the thin-walled part is similar to that of the cutting tool, its machining dyn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F2119/18
Inventor 朱立达丁洋刘长福刘宝光金慧成李兆斌史家顺于天彪巩亚东王宛山
Owner NORTHEASTERN UNIV LIAONING
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