Machining method and threaded pipe die for reverse extrusion threads of thin-walled stainless steel pipes

Abstract

The invention provides a machining method and threaded pipe die for reverse extrusion threads of thin-walled stainless steel pipes. The method includes the steps that a blank is prepared, and one section of the blank is cut out according to the length requirement to serve as a machining pipe material; and a section of round polyurethane strip is prepared according to the length of the machining pipe material, the threaded pipe die is prepared, the machining pipe material is placed in a mold cavity of the die, the round polyurethane strip is placed in the pipe material, and under the pressure, the round polyurethane strip transversely expands and extrudes outwards in the pipe material to form a thread on the pipe material. The threaded pipe die comprises an upper die body and a lower die body. A middle through hole is formed in the upper die body. Guide sleeves are arranged on the two sides of the middle through hole. The lower die body comprises a base. An outer die sleeve is arranged on the base. The inner side of the outer die sleeve is in an opening shape and has certain taper. A die core with an internal thread is arranged in the outer die sleeve in a matched manner and divided into two halves. A guide rod is arranged on the outer die sleeve and matched with the guide sleeves. The reverse extrusion thread is formed, a filter rod and a filter base which are adopted are made of thin-walled stainless steel pipe materials, and therefore product cost is low, and the machining method and the threaded pipe die for the reverse extrusion threads of the thin-walled stainless steel pipes are suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of processing methods and equipment for thin-walled stainless steel pipes, and relates to a processing method for reverse extrusion threads of thin-walled stainless steel pipes and a spiral pipe die. Background technique [0002] The traditional adjustment thread processing methods include thread rolling, thread rolling, and lathe processing thread. The material of the filter rod and filter seat of the above processing method must be solid core material or thick-walled material. The cost of the processed product is relatively high. It is difficult to accept; so how to process a processing method that is relatively low in cost and meets the product process requirements is the problem that needs to be solved this time. Contents of the invention [0003] In order to overcome the defects in the prior art, the purpose of the present invention is to provide a method for processing thin-walled stainless steel pip...

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Problems solved by technology

[0002] The traditional adjustment thread processing methods include thread rolling, thread rolling, and lathe processing thread. The material of the filter rod and filter seat of the above processing method must be solid core material or thick-walled material. The cost of the processed product is relatively high. It is difficult to accept; so how to process a processing method that is relatively low in cost and meets the product process requirements is the problem that needs to be solved this time

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