Thin-wall pipe fitting necking method and necking equipment applying method

Abstract

The invention relates to a thin-wall pipe fitting necking method and necking equipment applying the method. The necking method comprises the steps that firstly, the necking length of a pipe fitting isdetermined; secondly, the pipe fitting is clamped through a pipe clamping machine, the joint of the necking section and the non-necking section of the pipe fitting is extruded from outside to insidethrough a clamp, and meanwhile, the clamp is rotated till a concave annular groove is arranged in the pipe wall of the pipe fitting; and finally, the clamp is kept rotating, the pipe clamping machineis controlled to drive the pipe fitting to move in the axial direction till the necking section is formed, and pipe fitting necking is completed. The necking equipment mainly comprises a necking clamp, the pipe clamping machine used for clamping the pipe fitting and a first power cylinder driving the pipe clamping machine to move in the axial direction of the pipe fitting, wherein the necking clamp mainly comprises the clamp capable of achieving machining of the annular groove and a mechanism driving the clamp to form clamping and rotating. The necking forming efficiency is high, the size precision is good, the necking caliber is convenient to adjust, and the necking method and the necking equipment are particularly suitable for necking machining of thin-walled pipe fittings with the wallthickness being smaller than 0.25 mm.

Description

technical field [0001] The invention relates to the field of pipe fitting processing, and relates to a necking method for thin-walled pipe fittings and necking equipment applying the method. Background technique [0002] The shrinking process refers to a forming process in which the mouth of the pre-formed pipe fitting or tube blank is reduced to the required size through the shrinking die base. The existing shrinking process is generally suitable for pipes with a wall thickness of 0.25MM or more, but it is difficult to meet the requirements for thin-walled pipes. The main reason is that thin-walled pipes are easy to wrinkle when shrinking in the shrinking die base, resulting in unqualified quality. The prior art, such as the invention patent application publication number CN107745051A published in the Chinese patent literature, was published on March 2, 2018. The title of the invention application is "a thin-walled metal tube necking die and necking method", which includes ...

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Problems solved by technology

[0003] In order to overcome the above disadvantages, the object of the present invention is to provide the field with a thin-walled pipe necking method and the necking equipment using the method, so that it can solve the problem of the existing similar necking methods or equipment with high input costs and necking size. Difficult to adjust, difficult to meet the technical problems of mass industrial processing

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