Machining process of high-strength steel coil pipe

Abstract

The invention relates to a machining process of a high-strength steel coil pipe. The machining process of the high-strength steel coil pipe sequentially comprises the following steps of blanking, edgemilling and beveling, pre-bending, three-roller type plate rolling machine roller bending, straight seam welding and ring welding; before the plate rolling machine roller bending is carried out, theresilience of a steel plate is measured firstly, then the pipe coiling diameter is calculated when an actual pipe forming is carried out, the total lower displacement amount of an upper working rolleris calculated in the pipe coiling forming process, the pass displacement of the upper working roller is determined, and the pipe coiling machining is completed through a plurality of plate rolling; the pass displacement of the upper working roller is gradually decreased, and the first-pass displacement amount accounts for 50% or above of the total lower displacement amount, and the first three pass total displacement finishes 90% or above of the total lower displacement amount, and the upper working roller is basically in place when at least the antepenultimate pass is carried out. Accordingto the process, the displacement of the working roller can be effectively controlled, so that a high-strength steel plate with a proper size can prepare a dredging pipe with good straightness on a plate rolling machine, the gap of a pipe body does not exceed 3 mm at the end of the plate rolling, and welding can be carried out without circle rolling is performed, and the ovality of the pipe body isless than or equal to 2 mm.

Description

technical field [0001] The invention belongs to the technical field of steel plate cold processing, and in particular relates to a high-strength steel coil pipe processing technology. Background technique [0002] In the fields of dredging projects such as channel dredging and land reclamation, a large amount of mud and sand are transported to distant places through dredging pipelines. On the one hand, a large number of mud and sand particles in the dredging slurry cause wear and damage to the inner wall of the pipe, and at the same time, the liquid medium has a certain pH value to cause corrosion damage to the pipe body material, and the interaction between the two makes the dredged pipe serious abrasion failure . Especially in the seawater slurry dredging process, the service life of the delivery pipeline (16mm wall thickness) is generally 3-5 years, and it can be worn out even in 8 months under harsh working conditions. [0003] In order to improve the service life of d...

AI Technical Summary

Problems solved by technology

[0008] To sum up, the current three-roll tube coiling process is suitable for common carbon steel plates with a yield strength not exceeding 450MPa, and the springback of the steel plate is not considered in the coiling process; the springback amount involved in a small number of documents is mainly controlled by establishing The mathematical model is realized, the process is complicated and the precision is not high, it is difficult to apply to the actual coiled tube processing

For ultra-high-strength corrosion-resistant steel plates with a yield strength above 1250MPa, there is no effective coiling process

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