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Mixed preloaded bearing rigidity calculation method considering main shaft-bearing coupling

A technology for preloading bearings and stiffness calculation, which is used in calculations, special data processing applications, instruments, etc., and can solve problems such as not considering the influence of mixed preloading methods.

Inactive Publication Date: 2015-11-18
BEIJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

However, this point is not considered in the usual electric spindle design analysis, nor is the influence of mixed preloading methods considered

Method used

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  • Mixed preloaded bearing rigidity calculation method considering main shaft-bearing coupling
  • Mixed preloaded bearing rigidity calculation method considering main shaft-bearing coupling
  • Mixed preloaded bearing rigidity calculation method considering main shaft-bearing coupling

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Embodiment Construction

[0020] The present invention implements a hybrid preloaded bearing stiffness calculation method considering the spindle-bearing coupling relationship. The implementation of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0021] figure 1 It is a schematic diagram of the working state of the spindle-bearing system. As shown in the figure, the front end bearing of the main shaft adopts positioning preload, and the rear end bearing adopts constant pressure preload. The dotted line represents the static state, and the solid line represents the working state. The spindle produces dynamic displacement under the action of high speed and cutting load, and the displacements of the spindle support node and the inner ring of the bearing are {qi}, {qj}, {qk}. The outer ring of the positioning preload bearing is regarded as fixed, and the outer ring of the constant pressure preload bearing can slide along the axial direction.

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Abstract

The invention provides a mixed preloaded bearing rigidity calculation method considering a main shaft-bearing coupling relation. The method comprises the steps as follows: firstly establishing iterative equations for a location preloaded bearing and a constant pressure preloaded bearing, and a main shaft kinetic equation; then coupling the main shaft and the bearing by using bearing rigidity and main shaft support node displacement (bearing inner race displacement) as coupling amount, and finally using Matlab to compile a calculation program to obtain the rigidity of the mixed preloaded bearing based on a finite iteration method. The method considers the influence of mixed preloaded and the main shaft-bearing coupling relation to the rigidity of the bearing, and could use different preloaded manners to perform accurate calculation to dynamic rigidity of the bearing under a working condition of bearing and high-speed cutting. The method provides guidance for designing and using an electric main shaft.

Description

technical field [0001] The invention belongs to the field of stiffness analysis of spindle bearings, and relates to a method for calculating the stiffness of a hybrid preloaded bearing considering the coupling relationship between the spindle and the bearing. The method uses a finite iteration method to calculate the stiffness of the bearing and considers the influence of the hybrid preload and the coupling relationship between the spindle and the bearing. . Background technique [0002] The electric spindle is one of the key components of the CNC machine tool. Its characteristic is that the machine tool spindle and the spindle motor are combined into one, the machine tool spindle is directly driven by the built-in motor, and the main transmission chain of the machine tool is shortened to zero, thus realizing the zero transmission of the machine tool. The electric spindle has the advantages of high speed, high power, fast response, simplified machine tool design, and easy s...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 赵永胜王传国张爱平刘志峰马澄宇
Owner BEIJING UNIV OF TECH
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