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A soft measurement method and system for the displacement admittance of the tool nose point of a machining center

A technology of displacement admittance and machining center, which is used in measuring devices, measuring mechanical impedance, measuring ultrasonic/sonic/infrasonic waves, etc., and can solve the problem of difficult and accurate implementation of rotation angles.

Inactive Publication Date: 2016-05-25
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the traditional response coupling method needs to measure the frequency response function of tool holder rotation angle-bending moment, it is difficult to accurately implement the measurement of rotation angle and the application of bending moment in engineering applications.
Therefore, there is no applicable method to theoretically predict the frequency response function of the tool tip of the machining center.

Method used

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  • A soft measurement method and system for the displacement admittance of the tool nose point of a machining center
  • A soft measurement method and system for the displacement admittance of the tool nose point of a machining center
  • A soft measurement method and system for the displacement admittance of the tool nose point of a machining center

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Embodiment Construction

[0064] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0065] In this embodiment, the soft measuring system of the tool tip point displacement admittance of the machining center includes a tool, a test rod 7, an acceleration sensor 9, a force hammer 8, a data acquisition card 10 and a computer 11;

[0066] The test rod 7 or the tool is installed on the tool handle 4 of the machining center, the tool handle 4 is installed on the spindle 3 of the machining center, the acceleration sensor 9 is pasted on the end side of the test rod 7 or the end side of the tool, the signal output terminal of the force hammer 8, the acceleration The output terminals of the sensors 9 are all connected to the computer 11 through the data acquisition card 10 .

[0067] The force hammer 8 is used to excite the front end of the tool or the front end of the test rod 7 .

[0068] Test rod 7 is a standard shor...

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Abstract

The invention provides a soft measurement method and system for tool tip point displacement admittance of a machining center, which belongs to the technical field of vibration testing. It adopts a combination of experimental testing and finite element analysis to measure tools with different geometric characteristics installed in the machining center. Soft measurement of tool tip point displacement admittance. This invention avoids directly testing p2b2b and n2b2b, but solves p2b2b and n2b2b through easy-to-test quantities H11 and H12, reducing the number of experimental tests. Through several tests, the tool tips of all tools in the machining center tool magazine can be theoretically predicted after installation. Point displacement admittance greatly reduces testing costs and expenses. It does not require accurate modeling of the spindle-tool holder, avoiding errors in the modeling process and errors in the parameter identification process that lead to unreliable prediction results. In engineering It is highly operable when applied. The invention can perform multiple theoretical predictions after one test, and the obtained tool tip point displacement admittance is the basis for predicting chatter, and can predict chatter in milling processing.

Description

technical field [0001] The invention belongs to the technical field of vibration testing, and in particular relates to a soft measuring method and system for the displacement admittance of a tool tip point of a machining center. Background technique [0002] With the wide application of high-speed machining technology in aviation, automobile, and mold fields, the requirements for machining efficiency and metal removal rate in machining are getting higher and higher. However, in high-speed machining, the regenerative chatter of the machine tool will cause the vibration of the tool, seriously affect the processing quality and tool life, and limit the increase of the spindle speed. Theoretical prediction of chatter and the use of safe and reliable processing parameters for processing are of great significance. Current research shows that the occurrence of chatter is related to the frequency response function of the tool nose point and the spindle speed. [0003] The amplitude...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H15/00
Inventor 刘宇张义民李常有朱丽莎
Owner NORTHEASTERN UNIV LIAONING
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