Compact electric spindle

Abstract

The invention provides a compact electric spindle. The compact electric spindle comprises a core shaft, a front bearing assembly, a spindle motor, a rear bearing assembly, a sleeve and a cutter; the front bearing assembly comprises a front bearing seat, a sealing cover, a front bearing and a front bearing gland; the spindle motor comprises a stator, a rotor and a motor water jacket; the rear bearing assembly comprises a rear bearing, a rear bearing seat and a rear bearing gland; the compact electric spindle further comprises a coolant flow channel, the coolant flow channel comprises a first cooling flow channel, a second cooling runner, a third cooling runner and a fourth cooling runner. According to the compact electric spindle, the coolant flow channel is arranged around the front bearing assembly and is combined with front bearing cooling grooves and cooling spiral grooves in the peripheries of the rotor and the stator, so that the fact that whole front bearing assembly and the coreshaft are cooled is realized, the problems that an electric spindle system is cold outside and hot inside, thermal deformation is generated in the axial direction of the shaft core and the like are avoided; and the machining precision of a machine tool is further improved.

Description

technical field [0001] The invention relates to the field of machine tool processing, in particular to a compact electric spindle. Background technique [0002] A large number of research and production practices have shown that in modern mechanical manufacturing errors, the error caused by thermal deformation reaches 50%, and in high-speed and high-precision machining, the proportion is as high as 60% to 80%. As a key component of high-speed and high-precision CNC machine tools, the electric spindle's performance directly affects the machining accuracy of the machine tool. Because the electric spindle motor is built-in and the shell is closed, the heat generated by the power loss of the motor and the heat generated by the friction of the front and rear bearings cannot be exported in a timely and effective manner, and a large amount of heat is accumulated at the shaft core rotor, causing the shaft core bearing rotor to expand due to heat, resulting in serious damage. Therma...

AI Technical Summary

Problems solved by technology

However, the cooling water jacket only cools the stator of the built-in motor and the shell of the electric spindle, but has no cooling effect on the rotor and the shaft core of the electric spindle, so that a large amount of heat accumulates here and cannot be discharged, and the temperature of the shaft core continues to increase. Increase

Finally, the electric spindle system is "cooled outside and heated inside", and the shaft core is thermally deformed in the axial direction, which seriously affects the machining accuracy of the machine tool

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