Method of regulating bearing pretightening force using heat characteristics of metal material and its device

A technology for adjusting bearings and metal materials, applied to the rigid brackets, bearing components, shafts and bearings of bearing components, etc., can solve the problems of few applications and difficult to determine design parameters, and achieve the effect of simple and practical installation and great practical value.

Inactive Publication Date: 2007-04-18
北京机械工业学院
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  • Abstract
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Problems solved by technology

But the design parameters are difficult t...

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  • Method of regulating bearing pretightening force using heat characteristics of metal material and its device
  • Method of regulating bearing pretightening force using heat characteristics of metal material and its device
  • Method of regulating bearing pretightening force using heat characteristics of metal material and its device

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Embodiment Construction

[0047] specific implementation plan

[0048]As shown in Figure 1 to Figure 9, the main reason for the heating of the bearing is that the centrifugal force and the gyro torque acting on the bearing balls due to the increase of the rotating speed increase the friction, and at the same time, the temperature increases to cause the thermal expansion of the bearing, which increases the preload. The friction torque increases.

[0049] The first step in the automatic adjustment of the bearing preload is to determine the calculation method of the spindle heating and temperature rise.

[0050] (1) Establish a thermal analysis model to determine the heat generation and temperature rise of the main shaft. For the temperature distribution of the axisymmetric structure, the cylindrical coordinate system is used to determine the boundary conditions:

[0051] Establish a thermal analysis model: The main factors that cause the temperature rise of the spindle are the frictional moment of the r...

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Abstract

The inventive method consists in: modeling for thermal analysis of heating and temperature rise of the main shaft, using a cylindrical-coordinate system for the temperature distribution of the axially symmetric structure and determining the boundary condition; calculating friction heat and power loss of front and back bearings of main shaft in a state of different speeds and different pretightening forces; determining the relation of axial shifting of the bearing with the pretightening forces; according to the above calculated data, choosing material for making double-layer bushing and making length different double-layer bushing size of the sleeve because the extension volume of the bushing heat expansion depends on the length of the sleeve.

Description

technical field [0001] The invention relates to a method and a device for overcoming the temperature change caused by frictional heating of the main shaft of a machine tool in the process of increasing the rotating speed, which causes the change of the bearing pretightening force to limit the rotating speed and damage of the machine tool. Background technique [0002] At present, bearings and lubrication are the main factors affecting the speed range of machine tool spindles. Mechanical low-speed powerful milling heads are suitable for high-torque cutting. Usually, preloaded angular contact rolling bearings are used, and the working speed range is relatively small. In the spindle structure using contact bearings, the higher the spindle speed, the more serious the heat. Spindle heating is related to bearing preload. When the pre-tightening force is appropriate, the effect on the accuracy, stiffness, life, damping and noise reduction of the spindle bearing is more obvious. As...

Claims

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Application Information

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IPC IPC(8): F16C35/12B23C9/00
Inventor 杨庆东王科社孟玲霞
Owner 北京机械工业学院
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