Dynamic Design Method of High-Speed ​​Duplex Rolling Bearing Electric Spindle Rotor System

Abstract

The present invention provides a dynamic design method for a high-speed duplex rolling bearing electric spindle rotor system. The method comprises the following steps: step 1, structural configuration design of a high-speed duplex rolling bearing electric spindle rotor system; step 2, structural dynamics parameterization processing of a high-speed duplex rolling bearing electric spindle rotor; step 3, characteristics analysis of a 5-dimension rigidity matrix of a duplex rolling bearing; step 4, dynamics characteristics analysis of the high-speed duplex rolling bearing electric spindle rotor system; and step 5, dynamic design of the high-speed duplex rolling bearing electric spindle rotor system. The dynamic design method of a high-speed duplex rolling bearing electric spindle rotor system provided by the present invention greatly improves dynamic design precision of this type of electric spindle, shortens a design cycle, and provides an effective method for designing this type of high-speed motor spindle.

Description

technical field [0001] The invention relates to a dynamic design method for a high-speed double-connected rolling bearing electric spindle rotor system, which belongs to the field of high-speed cutting machine tool spindle unit design. Background technique [0002] In order to improve the radial and axial rigidity of the electric spindle, the double rolling bearing replaces the single row rolling bearing and is widely used in the electric spindle of the high-speed machining machine tool. Duplex rolling bearings are usually arranged in three ways: face-to-face, back-to-back and tandem. The bearing configuration directly affects the angular stiffness of the duplex rolling bearing, and then affects the dynamic characteristics of the electric spindle rotor system. Therefore, in the design stage, in addition to determining the parameters such as the specification of the main shaft, the specification of the bearing, the support position and the preload, it is also necessary to de...

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Problems solved by technology

It should be noted that in the design methods of the high-speed double rolling bearing electric spindle rotor system that have been formed at home and abroad, the commonly used modeling methods: (1) Simplify the double rolling bearing into a spring element that only includes radial stiffness. Taking into account the angular stiffness of the bearing, the corresponding relationship between the dynamic characteristics of the rotor system of the electric spindle and the bearing configuration cannot be obtained. Therefore, the calculation results cannot objectively reflect the real rotor dynamic behavior of the high-speed electric spindle, which in turn greatly reduces the accuracy of the dynamic design of the electric spindle. sex

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