Production process and device of a fully enclosed hydraulic composite bimetallic steel pipe

Abstract

The invention relates to a production process and device for a fully enclosed hydraulic composite bimetallic steel pipe. head assembly and right test head assembly; wherein, the upper clamp device, lower clamp device, left locking device, and right locking device clamp the steel pipe, and fully seal the steel pipe to control the elastic deformation of the base pipe, so that The combined deformation of the base pipe and the liner is within the range of fixed value control; the left and right test head assemblies are symmetrically arranged, and the main cylinder pushes the exhaust valve body and the test head forward or backward to complete the compound process. The invention sets a fully enclosed structure outside the steel pipe, so that the bulge of the base pipe is limited in a relatively rigid space during hydraulic compounding, which not only ensures the fit of the composite bimetallic pipe, but also ensures the base pipe and liner original mechanical properties.

Description

technical field [0001] The invention relates to the field of hydraulic composite metal pipes, in particular to a production process and device for fully enclosed hydraulic composite bimetallic steel pipes. Background technique [0002] At present, most of the bimetallic composite pipes produced by the hydraulic bulging process adopt the hydraulic composite method, which has been adopted by many domestic and foreign manufacturers. Two processes of loading and unloading are realized. Generally, the relationship between a limit deformation value and water pressure is theoretically calculated by using hydraulic pressure expansion and bulging technology. By controlling the water pressure, the inner liner and the outer base pipe will expand and deform, and the inner liner will undergo plasticity with the increase of pressure. Deformation, the pipe diameter expands to fit closely with the inner wall of the base pipe, the pressure continues to increase, the outer base pipe undergoe...

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Problems solved by technology

[0003] However, in the process of using the hydraulic composite process in the prior art, there are the following disadvantages: 1. The water pressure is controllable, but the deformation of the base pipe is uncontrollable, and there are differences between the theoretical data and the actual situation; 2. The overall deformation of the steel pipe is not uniform , the finished product is seriously bent; 3. Due to certain differences in the performance of the base tube, local deformation often occurs, and even blasting and safety accidents occur

Uneven deformation has a certain impact on the safety of composite pipes. Due to residual stress and uneven local stress, the stress state of composite pipes is complicated and in an unknown state. In some important occasions, this situation is extremely dangerous. of

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