Dual shaft structured high speed precise electric main shaft capable of performing rotation, linear reciprocating movement

Abstract

The invention relates to a design of a double-spindle structure high-speed precision electric spindle which can rotate or make linear reciprocating motion. The spindle is divided into an outer spindle 8 and an inner spindle 2, and the outer spindle and the inner spindle realize rotation with a guide transmission mechanism 12 through an interlocking pin under the magnetic induction of a stator 9 and a rotor 10, or the inner spindle is guided in the outer spindle through the guide transmission mechanism to make linear reciprocating motion under the driving action of an oil cylinder. The oil cylinder comprises a cylinder seat 16, a front gland 17, a piston 18, a cylinder body 19, a high-pressure injector 20, a cylinder cap 21, a bearing 22, an oil cylinder nut 23 and a dust cap 24, and working heads 1 are connected through flat keys on the pyramidal surface and the end surface of the inner spindle and then are fixed via a pull rod 25 and a rotating connector 26. The oil cylinder does notwork when the stator is energized, and the inner spindle and the outer spindle make synchronous rotation through the interlocking pin and the guide transmission mechanism; and the stator is not energized when the oil cylinder works, the interlocking pin is disassembled, and the guide transmission mechanism is rotationally connected on the inner spindle and can make linear reciprocating motion along the guide groove of the outer spindle. The high-speed precision electric spindle has the advantages of simple structure, smooth and reliable contact and low cost.

Description

technical field [0001] The invention belongs to the technical field of electric spindles, and in particular relates to the design of a high-speed precision electric spindle with a double-axis structure capable of rotating or rectilinear reciprocating motion. Background technique [0002] At present, the electric spindle as a high-speed drive unit has been widely used in various industries and various machinery. Its structure adopts a single-axis structure, and the spindle only provides rotational motion. If the motorized spindle is required to have the function of reciprocating motion while providing selective rotation, the motorized spindle must be installed on a table that can reciprocate. This structure cannot be used when there are space or structural restrictions. The reasons are as follows: [0003] 1. When the electric spindle adopts double-point or multi-point support, there is no relative movement of the spindle support parts that are relatively static in space duri...

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Problems solved by technology

[0004] 2. The accuracy of the main shaft cannot be adjusted basically, so the dimensional accuracy and shape accuracy of various parts of the main shaft are strictly required, and the processing requirements are strict

[0005] 3. Due to the requirement of supporting rigidity, the workbench that realizes the reciprocating motion of the electric spindle itself makes the overhang length of the working end of the electric spindle installed on it limited or the overhang is too long and the rigidity is too low, which cannot meet the processing requirements such as deep holes. make it impossible to apply

[0006] 4. The internal spline can provide rotation and reciprocating motion. Due to the deep inner hole, the processing is too difficult and the processing accuracy cannot be guaranteed, which will inevitably cause vibration and noise during work; at the same time, frequent reciprocating motion will quickly cause surface wear and cause failure. And because of the large contact friction force, a large additional force is generated, which further reduces the service life of the spindle

[0007] 5. In the spindle that uses sliding bearings to realize reciprocating motion, the precision cannot be adjusted after work wear, which limits its application in the spindle working under this working condition

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