Welding-free circular pipe forming method

Abstract

The invention relates to a circular pipe forming method, in particular to a welding-free circular pipe forming method. The forming method includes forming a punch forming plate in one step by the aid of a punching machine; subjecting a one-step formed product to first-time punch forming by the aid of a first-time punch forming device; and then subjecting a first-time punch formed product to second-time punch forming by the aid of a second-time punch forming device. The welding-free circular pipe forming method has the advantages that the forming method is cost-saving (the circular pipe is substituted by a low carbon steel plate) and free of machining process, so that a die becomes simple in structure; welding is substituted by riveting process, so that production cost in manufacturing is lowered, sizes are kept constant, while thermal deformation in the welding is avoided; and besides, the welding-free circular pipe forming method is simple to operate and can improve efficiency.

Description

technical field [0001] The invention relates to a method for forming a round tube, in particular to a method for forming a round tube without welding. Background technique [0002] Many domestic companies now use short round tubes, and they need to punch out some shapes at various positions around the tube's circumference, such as square holes, semicircles, etc. This type of demand is very large, and it has very high requirements for various parameters. , such as the size tolerance of the bottom square hole, the position tolerance of the bottom square hole and the upper notch, the ellipticity of the round tube, etc., but the rigidity of the round tube is not high. The previous processing route is: 1. Select the round tube of the same specification for blanking (such as a length of 100mm, you can choose a sawing machine, a lathe, etc.), which is time-consuming; 2. Square holes and circles on the circumferential surface of the round tube need to be punched. , if it is not in ...

AI Technical Summary

Problems solved by technology

The previous processing route is: 1. Select the round tube of the same specification for blanking (such as a length of 100mm, you can choose a sawing machine, a lathe, etc.), which is time-consuming; 2. The square hole and circle on the circumferential surface of the round tube need to be punched. , if it is not in the same plane, there are many parts to be formed, which will cause the accumulation of errors, and may require 3-4 times of stamping and forming (resulting in time-consuming, increased mold costs, and increased labor costs)

[0003] Use round pipe as raw material, the price is higher

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