Pull rod structure and spindle

Abstract

The invention provides a pull rod structure. The structure comprises a shaft core and a pull rod, wherein the shaft core is provided with a through hole, the pull rod penetrates through the through hole, the top end of the shaft core is sleeved with a pre-tightening elastic piece, the top end of the pull rod is in threaded connection with a pre-tightening nut, the two ends of the pre-tightening elastic piece abut against the shaft core and the pre-tightening nut correspondingly, the through hole comprises a non-circular hole section, the pull rod is provided with a non-circular shaft section,the non-circular shaft section and the non-circular hole section are slidably matched, the machining quality is stabler, and the machining reject ratio is low. The invention provides a spindle. The spindle comprises a shell, a motor and the pull rod structure, wherein a bearing is arranged in the shell, the bearing supports the shaft core, the motor is used for driving the shaft core to rotate, the lower end of the pull rod is in threaded connection with a chuck, the machining quality is stabler and the machining reject ratio is low.

Description

technical field [0001] The invention relates to a pull rod structure and a main shaft. Background technique [0002] refer to figure 1 , the main shaft in the prior art includes a shaft core 2, a through hole is provided inside the shaft core 2, a tie rod 1 is pierced through the through hole, and a collet 3 is fixedly connected to the lower end of the tie rod 1. Driven by the cylinder, the pull rod 1 slides downward relative to the shaft core 2 to drive the chuck 3 to slide, thereby realizing tool change. In the prior art, combined with figure 2 , image 3 , because the size of the upper end of the pull rod 1 is larger than the aperture of the shaft core 2, the pull rod 1 needs to be inserted into the shaft core 2 from the upper end of the shaft core 2 (the end near the cylinder). After the lower end (close to the end of cutter) of pull rod 1 passes through the through hole of axle core 2, chuck 3 is fixedly loaded onto. Under the action of the elastic force of the di...

AI Technical Summary

Problems solved by technology

[0005] Although the center line of the chuck 3 seems to be collinear with the axis of rotation of the shaft core 2, in fact, there is a certain deflection angle between the center line of the chuck 3 and the rotation axis of the shaft core 2, which will cause the tool to There is a certain deviation in the processing quality

As mentioned above, during the process of rotating the shaft core 2, there is a certain relative rotation between the tie rod 1 and the shaft core 2, which causes the above-mentioned deflection angle to change irregularly, resulting in irregular changes in the machining quality deviation of the tool. The change of processing quality deviation is caused by the relative rotation between the tie rod 1 and the shaft core 2 during the processing. Correction, resulting in difficult control of product quality

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