Open type built-in stainless steel dual-metal spiral composite pipe forming device

Abstract

The invention relates to an open type built-in stainless steel thermometal spiral composite pipe forming device mainly consisting of a forming mould (1) and a forming angle regulator (2), wherein support frames (11) and supports (19) are fixedly connected into a support structure of the forming mould (1), a rolling shaft (12) is installed between the support frames (11) through rolling shaft bearings (13), a ball support sleeve (16) of balls (12) is sleeved on the outer circumferential face of an inner support sleeve (17), balls (15) are spirally and uniformly distributed on the ball supporting sleeve (16) along the circumference and contact with the inner circumferential face of a forming pipe (30) which is made of a metal strap material (31) between the balls (15) and the balls (12) in a spiral coiling and forming mode, and the forming angle regulator (2) is used for regulating the forming angle of the forming mould (1). The invention is used for forming pipes with various wall thicknesses, and has the advantages of simple structure, low manufactured cost and simple and easy use, maintenance and repair.

Description

technical field [0001] The invention relates to a forming and manufacturing equipment for a metal spiral pipe, in particular to a forming device for a bimetallic spiral composite pipe. Background technique [0002] At present, the methods for producing bimetallic composite pipes at home and abroad mainly include mechanical expansion forming, explosive forming and hydraulic expansion forming. The mechanical expansion joint forming is to realize the plastic deformation of the inner tube and the elastic deformation of the outer tube of the composite tube through the rotary extrusion of the rolling mandrel, so that the outer tube of the composite tube generates residual stress on the inner tube to achieve the inner wall of the outer tube of the composite tube and the inner tube of the composite tube. Tight fit to the outer wall of the tube. This method has the following disadvantages: the production efficiency is not high, and the rolling pressure is uneven, so it is difficult ...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: the production efficiency is not high, and the rolling pressure is uneven, so it is difficult to carry out theoretical analysis. The quality of the expansion joint is mainly guaranteed by experience; This is easy to cause thinning, cracking or corrosion resistance of the lining

However, a technical difficulty in hydraulic bulging is how to solve the hydraulic sealing problem of the two ports; at the same time, because the hydraulic bulging method is carried out at room temperature, only a small amount of plastic deformation occurs in the inner tube, and only elastic deformation occurs in the outer tube, and the interface is bonded. For mechanical bonding, the bonding strength is not ideal

In addition, the equipment used in mechanical expansion forming, explosive forming and hydraulic expansion forming methods are relatively large, occupy a large area, and can only produce composite pipes of fixed size, and the length of the produced pipes is generally 3 to 6 meters. , continuous production cannot be carried out, which greatly limits the increase in productivity, and the materials they use are generally seamless steel pipes or steel plates, and the cost is relatively high

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