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Joint rigidity analyzing method for bi-side locking handle-main shaft under high rotating speed conditions

A joint, high-speed technology, applied in the direction of machine gear/transmission mechanism testing, etc., can solve problems such as separation of conical joint surfaces, reduction of joint stiffness, and impact on system dynamic performance

Active Publication Date: 2017-03-22
BEIJING UNIV OF TECH
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Problems solved by technology

However, when the speed is higher than a certain upper limit, the large end of the conical joint surface will still be partially separated, thereby reducing the stiffness of the joint and affecting the dynamic performance of the system
Due to the traditional interference of noise and other external environments in the experimental identification method has a great influence on the stiffness estimation results, and this method is limited to the analysis of the stiffness of the tool holder-spindle system joint under the condition of no rotation speed

Method used

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  • Joint rigidity analyzing method for bi-side locking handle-main shaft under high rotating speed conditions
  • Joint rigidity analyzing method for bi-side locking handle-main shaft under high rotating speed conditions
  • Joint rigidity analyzing method for bi-side locking handle-main shaft under high rotating speed conditions

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Embodiment Construction

[0016] The following is attached Figure 1-5 The present invention is described in further detail.

[0017] Step (1) establishes three-dimensional normal and tangential stiffness models;

[0018] Based on the M-B fractal theory, combined with the Hertz theory, and considering the elastoplastic deformation and domain expansion factor ψ, the total elastic normal load, elastoplastic normal load and The total plastic normal loads are as follows:

[0019]

[0020]

[0021]

[0022] where H G1 ,H G2 Both are coefficients related to material properties and fractal parameters of the joint surface,

[0023] H is the hardness of the softer material, H=2.8Y (Y is the yield strength value); k is a parameter related to Poisson's ratio, k=0.454+0.41ν; a' 1c ,a' 2c are the critical cross-sectional areas between elastic, elastic-plastic and plastic deformations, respectively.

[0024] Then the total normal load on the combined surface can be expressed as F=F e +F ep +F p ...

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Abstract

The invention discloses a joint rigidity analyzing method for a bi-side locking handle-main shaft under high rotating speed conditions, specifically to a joint portion rigidity modeling method taking non-uniform distribution of bi-joint-side pressure, and the system joint rigidity under high rotating speed conditions is analyzed based on the method. The method includes the steps of establishing a three-dimensional fractal normal and tangential rigidity model, analyzing to obtain pressure values of each node on a bi-joint side based on static force, calculating the equivalent rigidity value corresponding to the nodes, and obtaining the torsion and radial rigidity value through a confirmation model, and finally revealing the influence trend of broaching tool force, disk spring rigidity and disc spring pretightening force on the rigidity of the joint portion under different rotation speed and high rotation speed. The method is characterized in that the influence of elasto-plastic deformation and domain expansion factor are taken into consideration in the fractal theory, and nonuniformity of the pressure distribution on the joint surface is considered in the finite element analysis, thereby conducting accurate modeling and analyzing the joint rigidity of T40 handle-main shaft under high rotating speed conditions.

Description

technical field [0001] The invention belongs to the field of analysis of the dynamic characteristics of the tool holder-spindle system, and relates to a method for analyzing the stiffness of the joint of the double-sided locking tool handle-spindle under high-speed conditions, and more specifically a method that considers the uneven pressure of the double joint surface The combined part-form stiffness modeling method based on the distribution, and based on this method, the stiffness of the combined part of the system under the condition of high speed is analyzed. Background technique [0002] The tool holder is an important part connecting the machine tool spindle and the tool, and its spindle-tool holder joint is one of the weak links of the system, and the stiffness characteristics of the joint directly affect the machining accuracy of the system. The BT40 tool holder-spindle system is a traditional single-sided contact tool holder. Under high-speed conditions, the conical...

Claims

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Application Information

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IPC IPC(8): G01M13/02
Inventor 赵永胜许静静刘志峰蔡力钢程强
Owner BEIJING UNIV OF TECH
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