Process for production line of an ocean engineering structural steel pipes

Abstract

The invention discloses a process for a production line of ocean engineering structural steel pipes. The process comprises the following steps of: 1, checking steel plates; 2, typesetting and marking off; 3, cutting; 4, transporting the steel plates onto a conveying roller of an edge milling machine; 5, milling edges; 6, hoisting the steel plates on the conveying roller; 7, squeezing heads and prebending; 8, hoisting to the conveying roller; 9, rolling to form opened pipes, then sealing and carrying out positioned welding; 10, hoisting welding parts of arc ignition plates and arc quenching plates; 11, welding the arc ignition plates and the arc quenching plates at two ends of a weld pass; 12, welding longitudinal seams; 13, cutting the arc ignition plates and the arc quenching plates; 14,expanding the ends of the pipes; 15, marking off and cutting transition end bevels; 16, inspecting; 17, abutting joint circular seam groups; 18, prewelding circular seams; 19, filling and welding cover surfaces; 20, welding under the cooperation of a robot; 21, transporting to an inspection station; 22, inspecting; 23, marking off straight openings and nasal openings, and checking; 24, cutting; and 25, storing. By using the process, the work efficiency of assembly line work is greatly increased, and the quality of products is greatly improved; meanwhile, the production cost is reduced, and the ordering production of the steel pipes is ensured.

Description

technical field [0001] The invention relates to a steel pipe production line process, in particular to a marine engineering structural steel pipe production line process. Background technique [0002] At present, in the production process of industrial steel structures, there are generally two production methods for the prefabrication of commonly used steel structure pipes: press forming and roll forming. Among them, the wall thickness of the press-formed steel pipe is generally thin, not exceeding 42mm, and the outer diameter of the steel pipe is also small, generally less than 1.5m. Moreover, the opening of the tube tube after pressing is relatively large, and the tension difference in the tube blank is relatively large. The back is not a standard circle, the stress of the weld seam after welding is large, and it is easy to misalign. Therefore, the forming of steel structure pipes mainly adopts rolling units. [0003] The roll forming process includes the following steps...

AI Technical Summary

Problems solved by technology

However, in the actual engineering of the offshore engineering industry, generally due to the wide variety of steel pipe specifications and the larger thickness range, the edge rolling capacity of the plate is limited. Moreover, this forming unit is not well matched with other related processes and the automation level is low. Therefore, , there is a common phenomenon of idle work, which reduces the effective working time; and because the existing production line layout has more cross operations, more manual work, and longer inspection cycles, the labor intensity of the operators is high, which affects the production progress of steel pipes and quality

Images