A Cooling System for Electric Spindle Core

Abstract

The invention discloses an electric spindle core cooling structure and system. An electric spindle core is provided with a plurality of U-shaped cooling units consisting of straight-hole channels; the inflow channel inlet and reflow channel outlet of each cooling channel unit are formed in a staggered way in the back end face of the electric spindle core; a connecting channel is formed inside the electric spindle core close to a front bearing to connect the inflow channel with the reflow channel; specific to the aim of realizing leading-in and leading-out of a cooling channel unit cooling medium, a shaft head flange type multi-channel high-speed rotary joint is tightly connected with the back end face of the conventional electric spindle core through a back bearing sleeve, an inflow channel header and a reflow channel header are provided, and an electric spindle core forced circular cooling system is constructed with an oil-water cooling system. By adopting the electric spindle core cooling structure and system, direct, rapid and efficient forced circular cooling of the electric spindle core can be realized, the problem of heat dissipation caused by long-term high-power processing of an electric spindle is solved, thermal deformation of the electric spindle core is reduced, and the heat stability of the electric spindle is enhanced.

Description

【Technical field】 [0001] The invention belongs to the technical field of electric spindle cooling, and in particular relates to an electric spindle core cooling system. 【Background technique】 [0002] As the core component of high-speed machine tools, electric spindle is the key to realize high-speed and precision machining. However, due to the built-in electric spindle motor and the closed shell, the heat generated by the power loss of the motor and the friction of the front and rear bearings cannot be discharged in time, resulting in the formation of a complex temperature field inside the electric spindle, resulting in serious thermal deformation. According to statistics, in precision machining, the proportion of machining errors caused by thermal deformation is as high as 40%-70%. [0003] For bearing friction and heating, the electric spindle adopts bearing oil-air lubrication technology, which has improved the bearing heat dissipation problem to a certain extent. For ...

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Problems solved by technology

However, the above-mentioned cooling technology has the following deficiencies in practical application: for the solution (1), although the problem of poor heat dissipation of the built-in motor has been improved, the axial dimension of the entire spindle unit is increased due to the rear placement of the motor, and the output of the electric spindle unit Reduced, thus limiting the application of electric spindles with this structure (it is only suitable for small high-speed CNC machine tools)

For solution (2), the heat pipe technology is applied to the cooling of the electric spindle. Although it can cool the electric spindle core to a certain extent, the condensation section of the heat pipe cannot be directly cooled by liquid cooling medium, but by cooling air. Heat exchange; coupled with the limited heat exchange power of the heat pipe, this cooling solution cannot effectively solve the heat dissipation problem caused by the long-term and high-power machining of the electric spindle

In addition, there are problems with the stability and reliability of its operation

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