Rotation necking-down device

Abstract

The invention discloses a rotation necking-down device. The rotation necking-down device comprises a power head, a base and at least two discs. The power head can be driven by an external power device to rotate around the axis of the power head and move up and down with the using direction as a benchmark. The upper end of the base is detachably fixed to the lower end of the power head, each disc is provided with an adjusting device, the upper ends of the adjusting devices are positioned and fixed at the lower end of the base, the lower ends of the adjusting devices are fixedly connected with the upper ends of the corresponding discs, the adjusting devices can adjust the discs in the axial direction and the radial direction of the power head, the discs are located on the same plane and distributed with the axis of the power head as the center, each disc is in a reverse circular platform shape with the peripheral sides concaving towards the center by certain radian, and the discs can rotate around their own axis. The rotation neck-down device can compress an opening of a pipe to neck down the opening of the pipe, the surface of the necked-down pipe is smooth, the size of the necked-down pipe is accurate, and the rotation neck-down device is suitable for necking-down fine machining of various pipes and especially suitable for machining and manufacturing cannonball type or needle tubing type pen heads in the pen manufacturing industry.

Description

technical field [0001] The invention relates to a pipe head necking device, in particular to a rotary necking device which can be used for necking pen materials in the pen making industry. Background technique [0002] The necking process is widely used, and can be used for forming parts such as bullet casings, shell casings, steel gas cylinders, bicycle frame risers, bicycle seat saddle tubes, and pen tips in the pen industry. A forming process in which the mouth of a tube or pipe blank is reduced by a shrinking die. Take the shrinking of the nib in the pen-making industry as an example. The key to writing with the nib is the ball inside the nib. How to precisely limit the ball to a certain area in the nib tube to prevent the ball from running out usually requires shrinking the nib. Usually, the traditional extrusion and necking process is used for the necking of the nib. The necking of this method will generate local stress at the mouth of the pen material, and the surfac...

AI Technical Summary

Problems solved by technology

Take the shrinking of the nib in the pen-making industry as an example. The key to writing with the nib is the ball inside the nib. How to precisely limit the ball to a certain area in the nib tube to prevent the ball from running out usually requires shrinking the nib. Usually, the traditional extrusion and necking process is used for the necking of the nib. The necking of this method will generate local stress at the mouth of the pen material, and the surface is not smooth, which will affect the writing quality of the nib. For different specifications of the nib, it is necessary to The corresponding shrinking mold will increase the cost

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