High-speed electric spindle power-heat coupling modeling method

Abstract

The invention discloses a high-speed electric spindle power-heat coupling modeling method. The method comprises the steps as follows: respectively acquiring the engineering parameters of the to-be-combined surfaces of a bearing and a spindle; by utilizing the fractal contact theory and the hertz contact theory, calculating a mapping model between the rigidity and the heat transfer coefficient of the joint surface of the bearing and the spindle and contact pressure and contact gap; according to the structure and material parameters of the bearing, acquiring a mapping model between the load and temperature of the bearing and rigidity, outer ring thermal contact resistance of the bearing, the inner ring thermal contact resistance of the bearing and heating power by using a bearing mechanical model and a bearing thermal model; calculating the motor heat source of the spindle; calculating the heat radiation coefficient of each surface of the spindle; establishing a finite element model of the structure of the spindle and the result; reading the running parameters of the spindle; processing the running parameters by utilizing the finite element. The method disclosed by the invention can reduce errors caused by the joint surface of the conventional method and errors caused by the non-update of the model joint surface and the bearing mechanical and thermal parameters.

Description

technical field [0001] The invention belongs to the field of structural thermal and mechanical modeling analysis and design of a high-speed electric spindle, and more specifically relates to a force-thermal coupling modeling method for a high-speed electric spindle. Background technique [0002] High-speed electric spindles have been widely used in modern manufacturing. With the development of manufacturing industries such as aviation and automobiles, there is an increasing demand for processing difficult-to-machine metals such as stainless steel, titanium alloys, and aluminum alloys. The processing of this type of metal needs to provide high cutting torque at 15000rpm, which requires the spindle to have a larger diameter and a high-power built-in motor. The increase in the diameter of the spindle will significantly increase the heat generation of the spindle bearing, and at the same time intensify the force and thermal interaction of the various components in the spindle, ...

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Problems solved by technology

[0004] However, the existing models have the following problems: 1. The traditional spindle model usually treats the joint surface as a consolidation or as a gap, which will lead to a high joint surface error in the model; 2. The joint surface of the traditional spindle model Some empirical formulas are used, and sufficient accuracy must be calibrated through actual prototype experiments, and the performance prediction of the spindle cannot be realized in the spindle design stage; 3. The parameters of the joint surface and bearing in the traditional spindle model will not be updated during the simulation process, but the spindle The load of the joint surface and the bearing is changing during the operation of the model, which will lead to calculation errors

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