Forming method of 90 degree straight pier thickening and thickening bent pipe

Abstract

The invention relates to a forming method of a 90-degree straight-section upsetting thickening elbow. The forming method comprises the following steps of (1) perforation, (2) heating bending by adopting electric induction, (3) extrusion forming of the elbow, (4) increase of a straight section for electric induction heating, (5) extrusion by adopting an increasing and thickening upsetting method with a plurality of processing procedures to a required shape, (6) normalizing heat treatment after all products are formed and detection on the rigidity to be less than or equal to 197HB, (7) 100% MT (magnetic particle testing) on the surfaces of the products, and (8) detection on the final overall dimension, so as to enable the geometrical tolerance to meet the requirement of a drawing. By adopting the forming method, seamless tubes made of forging round steel are adopted to process a 90-degree straight-section high-pressure resistant tube, the tube which is processed by adopting the method has the advantages of reliable quality and high production efficiency, a large quantity of foreign exchange expenses can be saved, and economic burdens in the relevant using industry are reduced.

Description

technical field [0001] The invention relates to a method for forming a 90-degree straight section thickening and thickening bent pipe. The utility model belongs to the technical field of pipe connectors (pipe fittings). Background technique [0002] In the past, when making 90° pipe fittings with straight sections, stamping was generally used. In addition, because the diameter of the straight section is consistent with the wall thickness, the manufacturing process is relatively simple and easy to form. With the improvement of market demand, the application of seamless pipes made of forged round steel to process high-pressure pipe fittings with straight sections at 90° has gradually entered the technical field of pipe connectors. This type of pipe fittings not only has a smaller radius R at the bend (R≤190mm), and the wall thickness of the pipe wall, the wall thickness of the straight sections at both ends is different, and the diameter is also different, which cannot be rea...

AI Technical Summary

Problems solved by technology

With the improvement of market demand, the application of seamless pipes made of forged round steel to process high-pressure pipe fittings with straight sections at 90° has gradually entered the technical field of pipe connectors. This type of pipe fittings not only has a smaller radius R at the bend (R≤190mm), and the wall thickness of the pipe wall, the straight sections at both ends have different wall thicknesses and diameters, which cannot be achieved by using the previous stamping and bending forming method

Images