Electric main shaft and machine tool

Abstract

The invention discloses an electric main shaft and a machine tool. The electric main shaft comprises a machine body, a shaft core assembly and a motor; the shaft core assembly comprises a first shaft core and a second shaft core; the first shaft core and the second shaft core are coaxially connected to form the shaft core assembly capable of synchronously rotating together; the first shaft core and the second shaft core can float in the axial direction at the joint so as to absorb the elongation generated when the shaft core assembly is heated; the shaft core assembly penetrates through an inner cavity of the machine body; the first shaft core is supported on a first bearing seat through a first bearing, the outer ring of the first bearing is locked on the first bearing seat in the axial direction, and the inner ring of the first bearing is locked on the first shaft core in the axial direction; the second shaft core is supported on a second bearing seat through a second bearing, the outer ring of the second bearing is locked on the second bearing seat in the axial direction, and the inner ring of the second bearing is locked on the second shaft core in the axial direction; and the motor comprises a stator and a rotor. The elongation in the shaft cores is eliminated, so that the elongation at the two ends of each shaft core is kept stable, and finally, the machining performance of the two ends of the main shaft is consistent and stable.

Description

technical field [0001] The invention is used in the field of mechanical processing, and in particular relates to an electric spindle and a machine tool. Background technique [0002] As the core component of the machine tool, the performance of the spindle directly affects the machining accuracy of the product. When the processing accuracy of the main shaft cannot meet the requirements, the processed products cannot reach higher accuracy. Therefore, only by continuously improving the machining performance of the spindle can the machining accuracy of the machine tool be continuously improved. [0003] When the spindle rotates at high speed, the shaft core is heated and the axial length changes, which affects the processing performance of the product. Therefore, how to control the change of the shaft core elongation is very important. In the existing technology, such as figure 1 As shown, the shaft core of the main shaft is a one-piece shaft core, the inner and outer rings...

AI Technical Summary

Problems solved by technology

With this design structure, when the spindle rotates at high speed, the elongation at both ends of the shaft core after heating is inconsistent, and most of the elongation will be concentrated on the floating side of the outer ring of the bearing, so the machining accuracy at both ends of the spindle will be reduced. difference

At the same time, the shaft core is designed as an integrated structure, and the elongation generated by the heat inside the shaft core cannot be eliminated, which will cause fluctuations in the elongation at both ends of the shaft core, which will eventually affect the machining accuracy of the spindle.

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