Central spindle capable of automatically centring and tapping internal screw thread

Abstract

The invention discloses a central spindle capable of automatically centring and tapping internal screw threads, which comprises a morse taper handle, an aligning sleeve, a screw tap sleeve, screws, a screw tap, joint column heads, springs, plugs and a thrust ball bearing. The upper half part of the morse taper handle is a morse taper body; the lower half part of the morse taper handle is a hollow sleeve body; four through holes which are uniformly distributed at an angle of 90 degrees are arranged on the wall of the sleeve body of the morse taper handle; the internal screw threads are tapped at the outer end ports of the through holes; the joint column heads, the springs and the plugs are sequentially arranged in the through holes from inside to outside; the thrust ball bearing and the aligning sleeve are sequentially arranged in the sleeve body of the morse taper handle from inside to outside; the screw tap sleeve and the interchangeable screw tap are sequentially arranged in the aligning sleeve from outside to inside and are fastened by the screws; and circular pits in fit with the sizes of semicircular balls of the joint column heads, which are uniformly distributed at an angle of 90 degrees, are arranged on the wall of the aligning sleeve. The central spindle has simple structure and can be automatically regulated and centred; the requirement on the coaxiality of the axis of the screw tap and the center of a screw thread bottom hole is ensured; the screw tap is avoided being broken; and a workpiece is avoided being scraped.

Description

technical field [0001] The invention relates to machining equipment for metal materials, in particular to a mandrel for automatically centering and tapping internal threads. Background technique [0002] In the process of mechanical processing, taps are often broken when tapping internal threads, especially for small-sized internal threads, the taps used are thinner and easier to break, which seriously leads to the scrapping of workpieces. This is mainly due to the fact that the axis of the tap does not coincide with the center of the bottom hole, resulting in uneven force on the tap. In order to solve this problem, considering the floating centering, using the scalability of the spring, the tap is automatically adjusted based on the center of the bottom hole to achieve the coincidence of the two centers. Based on the above reasons and ideas, a set of mandrels for automatically centering and tapping internal threads has been designed. Contents of the invention [0003] T...

AI Technical Summary

Problems solved by technology

[0002] In the process of mechanical processing, taps are often broken when tapping internal threads, especially for small-

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