Radially-rotating heat pipe structure for cooling high-speed electric spindle inner cavity

Abstract

The invention provides a radially-rotating heat pipe structure for cooling a high-speed electric spindle inner cavity. Radially-rotating heat pipe assemblies are mounted on the positions, at the frontends and the rear ends of a motor stator and a motor rotor in an electric spindle, of a rotary shaft and used for guiding out an air gap between the motor stator and the motor rotor and heat generated by the outer circles of a front bearing set and a rear bearing set. Each radially-rotating heat pipe assembly comprises three or more uniformly-distributed radially-rotating heat pipe, all the radially-rotating heat pipes mutually communicate with one another through a communicating cavity in the center, and a mounting ring in the middle of the communicating cavity is fixed to the rotary shaft.Each radially-rotating heat pipe is composed of three parts, an evaporating section at the top, a heat insulation section in the middle and a condensing section at the bottom, and the pipeline lengthof each radially-rotating heat pipe needs to enable the corresponding evaporating section of the mounted radially-rotating heat pipe to be exactly located at the gap between the motor stator and the motor rotor. The radially-rotating heat pipe structure for cooling the high-speed electric spindle inner cavity is capable of reducing heat deformation of a spindle and improving machining accuracy andmeanwhile further has the advantages that the reliability is high, change of an original structure of the electric spindle is small, and the cost is low.

Description

technical field [0001] The invention relates to the technical field of high-speed electric spindle cooling, in particular to a radially rotating heat pipe structure used for cooling the internal cavity of a high-speed electric spindle. Background technique [0002] The thermal characteristics of the electric spindle are an important index to measure the overall performance of the spindle system. Reducing the thermal deformation of the high-speed spindle system has become one of the important factors to improve the machining accuracy of the electric spindle. Due to the limitations of the electric spindle's own structural factors, the heat generated by the motor and bearings accumulates in the motor stator-rotor gap and the outer ring of the bearing and cannot be exported in a timely and effective manner, causing the rotor and the outer ring of the bearing to expand due to heat, causing the spindle to match the dimensions. Changes will eventually affect the machining accuracy ...

AI Technical Summary

Problems solved by technology

For the outer rings and bases of the front and rear bearings, the air gap between the stator and rotor of the built-in motor, etc., where heat is easy to accumulate, there is no effective heat extraction method, resulting in the continuous accumulation of heat in the electric spindle to form a temperature of "cold outside and hot inside". The distribution pattern, which in turn leads to the generation of thermal deformation, seriously restricts the improvement of the machining accuracy of CNC machine tools

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