Thin wall cold roll forming process

Abstract

The invention discloses a thin wall cold roll forming process which solves the problems that bending, scratching and low machining precision occur when a thin-walled steel plate with the thickness of 1.5-3 mm is made into a round tube with a large diameter in a cold roll forming mode. The thin wall cold roll forming process includes several steps of raw material slitting, unit feeding, unit forming, high-frequency welding, straightening and saw cutting. In the coiling procedure of the raw material slitting process, coiled parts are improved, and a separator process sleeve is additionally arranged on a separator shaft; unit feeding is completed for a steel belt jointly through devices of an uncoiler, a leveler, a roller way, a cutoff welding machine, a double-delivery machine, a lifting roller way, a forming machine and the like; straightening operation is finished through a sizing mill, and a straightener does not need to be arranged additionally. According to the cold roll forming process, the steel plate with the thickness of 1.5-3 mm is made into the round tube with the diameter of 120-140 mm, machining precision is achieved in the mode that the diameter tolerance is + / - 0.5 mm, the curvature is millesimal and the width allowance of raw materials is + / - 0.3 mm, and surface scratching and sink marks of cold forming sectional steel cannot be caused in the machining process.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a thin-wall cold bending forming process. Background technique [0002] Cold roll forming is to continuously bend metal strips such as coils and strips transversely through sequentially configured multi-pass forming rolls to make profiles with specific cross-sections. Cold roll forming is a material-saving, energy-saving and efficient new process and new technology for sheet metal forming. Using this process, not only can produce high-quality section steel products, but also can shorten the product development cycle, improve production efficiency, and thus improve the market competitiveness of enterprises. [0003] However, the following defects exist in the cold bending of 1.5-3mm thin-walled steel plates into large-diameter round pipes by using the existing cold-formation process: [0004] 1. Normal shearing is prone to problems such as flanging, sic...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of bending, scratches and low processing precision when 1.5-3mm thin-walled steel plates are cold-formed into large-diameter round pipes, and the 2mm steel plates are slitting through raw materials—machine feeding—machine forming ——High-frequency welding——straightening——sawing process, cold-formed into a round tube with a diameter of 120-140mm, and its processing accuracy reaches a diameter tolerance of ±0.5mm, a bending degree of 1 / 1,000, and a raw material width tolerance of ± 0.3mm, and will not cause scratches and dents on the surface of cold-formed steel during processing

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