Dynamic pre-tightening force measurement method of main shaft bearing of machine tool

A technology of machine tool spindle and measurement method, which is applied in the direction of mechanical bearing testing, force/torque/work measuring instrument, measuring device, etc. Accurate results

Active Publication Date: 2012-07-11
XI AN JIAOTONG UNIV
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Problems solved by technology

[0005] The purpose of the invention is to propose a method for measuring the dynamic preload of machine tool spindle bearings in view of the current situation that the dynamic preload of the machine tool spindle bearing is difficult to measure and the measurement results are inaccurate

Method used

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  • Dynamic pre-tightening force measurement method of main shaft bearing of machine tool
  • Dynamic pre-tightening force measurement method of main shaft bearing of machine tool
  • Dynamic pre-tightening force measurement method of main shaft bearing of machine tool

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Embodiment Construction

[0013] Attached below Figure 1 to Figure 4 The method for measuring the dynamic preload force of the main shaft bearing of the machine tool of the present invention is introduced in detail:

[0014] 1. Establish a mechanical model of the main shaft. According to the actual structure of the main shaft, it can be divided into a two-bearing support-rotor system and a three-bearing support-rotor system, such as figure 2 As shown, according to the force and moment balance equation, the force of each bearing is calculated by numerical calculation method. for figure 2 For the two bearing support-rotor system shown in (a), the bearing support reaction force can be obtained according to the force and moment balance equation:

[0015] F - F y 1 - F y ...

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Abstract

The invention discloses a dynamic pre-tightening force measurement method of a main shaft bearing of a machine tool. The dynamic pre-tightening force measurement method comprises the following steps of: firstly, carrying out load analysis on a main shaft support bearing and calculating a load borne by the main shaft bearing; secondly, establishing a five-degree-of-freedom nonlinear finite element model of the main shaft bearing of the machine tool, and establishing a fitting relation between a dynamic rigidity of the main shaft bearing and a pre-tightening force of the main shaft bearing; and then, establishing a five-degree-of-freedom finite element model of a main shaft of the machine tool and establishing a relation between the dynamic rigidity of the main shaft bearing and the dynamic rigidity of the main shaft; and then, calculating the dynamic rigidity of the main shaft under different bearing pre-tightening forces and rotating speeds, and establishing a fitting relation database among the dynamic rigidity of the main shaft, the pre-tightening force of the bearing and the rotating speed of the bearing; and finally, measuring the dynamic rigidity of the front end of the main shaft by a main shaft dynamic rigidity measurement test; and inquiring the dynamic rigidity of the main shaft in the fitting relation database among the dynamic rigidity of the main shaft, the pre-tightening force of the bearing and the rotating speed of the bearing to obtain a dynamic pre-tightening force of the main shaft bearing of the machine tool.

Description

technical field [0001] The invention belongs to the application field of performance testing of main shaft bearings of machine tools, and relates to a method for measuring the dynamic pre-tightening force of main shaft bearings of machine tools. Background technique [0002] Preloading the rolling bearing of the machine tool spindle, on the one hand, can eliminate the clearance of the rolling bearing during the manufacturing and assembly process, increase the rigidity of the bearing, and improve the rotation accuracy of the spindle. , to eliminate the gyroscopic effect, thereby improving the heating condition of the bearing and prolonging the service life of the bearing. [0003] The preloading method commonly used for machine tool spindles is constant pressure preloading, which is characterized by constant preloading force, and its size is comprehensively determined according to the requirements of low-speed heavy cutting and high-speed light cutting for preloading force, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M13/04G01L5/00
Inventor 朱永生洪军田久良郭俊康王梦茜李纯洁
Owner XI AN JIAOTONG UNIV
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