Full-hydraulic plate-edge pre-bending device and method for thick-wall metal longitudinal welded pipes

Abstract

The invention relates to the technical field of pre-bending devices for welded pipes, in particular to a full-hydraulic plate-edge pre-bending device and method for thick-wall metal longitudinal welded pipes. The full-hydraulic plate-edge pre-bending device for the thick-wall metal longitudinal welded pipes comprises rack main bodies which are symmetrically arranged left and right, wherein the rack main bodies are installed on a lower bottom plate, carrier roller mechanisms are arranged on the inlet side and the outlet side of the rack main bodies and used for conveying plates, at least two sets of alignment mechanisms are arranged on the inlet side of the rack main bodies, and the alignment mechanisms are installed on carrier roller frames and used for straightening the plates. A full-hydraulic working structure is adopted, high efficiency and precision control in the machining process are guaranteed, and it is guaranteed that the position error is smaller than 0.1 mm when all key structure parts operate; and meanwhile, by arranging mounting tables, first hydraulic motors, first rollers and the like, replacement of a lower mold and an upper mold is facilitated, and the efficiency is improved.

Description

technical field [0001] The patent of the present invention relates to the technical field of pre-bending devices for welded pipes, in particular to a full-hydraulic pre-bending device and method for thick-walled metal straight seam welded pipe edges. Background technique [0002] At present, thick-walled metal longitudinal seam welded pipes have been widely used in petrochemical, offshore engineering, oil and gas transportation, infrastructure engineering and other industries. In the production process of thick-walled pipes, the JCOE forming method is mainly adopted, and its core processing procedures are pre-bending forming→step bending forming→automatic welding→heat treatment→full circle sizing. Among them, pre-bending is to bend the two sides of the steel plate into a circular arc with the same curvature as the subsequent bending, so as to ensure that the end face of the weld seam is correct after the pipe is formed. The pre-bending effect directly affects the quality and...

AI Technical Summary

Problems solved by technology

In the actual production process, due to the unreasonable design of the equipment structure and the mismatch of the process technology, there are phenomena of "pouting" of the weld and cracking during diameter expansion.

The phase difference adjustment structure of the upper and lower molds of the traditional plate edge pre-bending device adopts the form of screw rods. Because there is a gap between the screw rods, the mold will move during the pre-bending forming process, which will affect the product quality; the traditional pre-bending hydraulic cylinder does not use pressure classification. The same pressure is used in the pre-bending process of different plate thicknesses, resulting in the thinning of the thin plate during the bending process, which affects the consistency of the pipe thickness; the symmetrical arrangement structure on both sides of the traditional plate edge pre-bending device adopts the screw type Transmission, under the production conditions of frequent changes in product specifications, the production efficiency of the screw adjustment method is slightly low, which affects the production rhythm of the entire production line

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