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Dynamic modeling method of machine tool spindle-tool holder connection structure based on ultrasonic testing

A dynamic modeling and connection structure technology, applied in computer-aided design, instrumentation, geometric CAD, etc., can solve problems such as noise sensitivity, and achieve high accuracy and good versatility

Active Publication Date: 2022-03-15
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a dynamic modeling method of the machine tool spindle-knife handle connection structure based on ultrasonic detection, which solves the problem that the existing ultrasonic contact stiffness detection method is sensitive to noise, and realizes the - Accurate construction of the dynamic Xu model of the tool handle connection structure

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  • Dynamic modeling method of machine tool spindle-tool holder connection structure based on ultrasonic testing
  • Dynamic modeling method of machine tool spindle-tool holder connection structure based on ultrasonic testing
  • Dynamic modeling method of machine tool spindle-tool holder connection structure based on ultrasonic testing

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Embodiment Construction

[0041] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0042] Tool holders with a taper of 7:24 are widely used in the spindle system of machine tools. The contact stiffness detection method of the present invention will be further described in detail in conjunction with the accompanying drawings by taking the 7:24 spindle-tool holder joint surface as an example.

[0043]Step 1. In a typical spindle-tool holder connection structure, the outer surface of the spindle taper hole is a cylindrical surface, while the spindle taper hole-tool holder joint surface is conical.

[0044] The material of the tested piece in this embodiment is alloy steel, and the contact surface is ground. Refer to attached figure 1 , since the outer surface of the tapered hole test piece is generally a cylindrical surface and the conical joint surface is not parallel, in order to achieve vertical incidence, it is necessary to adjust the tilt an...

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Abstract

The invention relates to a dynamic modeling method of the machine tool spindle-knife handle connection structure based on ultrasonic detection, which calculates the angle between the ultrasonic probe and the normal line of the outer surface of the taper hole, and uses the ultrasonic probe to obtain the reflection echo data of the joint surface and Combined surface reflection echo data under different broaching forces; then measure and calculate the ultrasonic reflectivity of the corrected specimen under different pressures; use ultrasonic data to establish a dynamic model of the spindle-tool holder connection structure in commercial finite element software. The ultrasonic method proposed by the present invention can accurately detect the contact stiffness of the main shaft-knife handle joint surface, and the dynamic model of the main shaft-knife handle connection structure established on this basis has a deviation of less than 2.2% from the experimental result of the hammering method, with high accuracy , good versatility.

Description

technical field [0001] The invention belongs to the field of structural dynamic analysis of machine tools, and relates to a dynamic modeling method for a machine tool spindle-knife handle connection structure based on ultrasonic detection. Background technique [0002] The machine tool spindle is the core component of the machine tool, and the connection surface between the spindle and the tool holder is an indispensable joint surface in the spindle. The machine tool spindle-tool holder connection structure has an important influence on the deformation of the tool tip of the machine tool and the dynamic characteristics of the spindle system. For example, 25% to 50% of the deformation of the tool end comes from the joint surface of the spindle tool holder. With the continuous improvement of the performance requirements of the machine tool and the spindle system, the analysis of the dynamic characteristics of the spindle-tool holder connection structure has become an important...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/17G06F30/23G06F119/14
CPCG06F30/17G06F2119/06G06F30/23
Inventor 杜飞徐超张园园张子涵
Owner NORTHWESTERN POLYTECHNICAL UNIV
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