Method and device for correcting outer diameter of steel pipes

Abstract

The invention discloses a method for correcting outer diameter of steel pipes. The method comprises the step of adding a drawing device for pushing a steel pipe to the prior cold-drawing machine, wherein a trolley of the cold-drawing machine grips and draws the drawing device, and the drawing device pushes the steel pipe to pass through a die-drawing seat so as to correct the outer diameter of the steel pipe. The method for correcting outer diameter of steel pipes has the advantages of improving production efficiency and reducing production cost, along with simple process and convenient operation.

Description

technical field [0001] The invention relates to a method and a device for correcting a steel pipe, in particular to a method and a device for correcting the outer diameter of a steel pipe. Background technique [0002] In the production process of steel pipes, due to process factors such as drawing (or cold rolling) die wear, solution treatment deformation, and straightening adjustment errors, it is inevitable that the outer diameter of the finished product will exceed the standard positive deviation or the ovality of the steel pipe will occur, especially for thin steel pipes. Wall pipes or high-standard contract steel pipes have particularly prominent requirements for outer diameters. For random-size contracts, once the above problems occur, the general method of correcting the outer diameter of the steel pipe is to weld the pipe head with argon arc welding first, so that the steel pipe head can pass through the drawing die seat and be cold-drawn to the specified size. How...

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Problems solved by technology

However, the correction method for the outer diameter of the steel pipe above consumes 1.0 to 3.0 cm of the head of the steel pipe. Steel pipes with positive deviation or ovality cannot be directly processed by argon arc welding welding head. After the welding head is cold-drawn and finished, the steel pipe will be short, and it will either be re-fed for production, or it will be judged as a substandard product; the existing steel pipe correction method The process is cumbersome and redundant, the production efficiency is low, and the production cost of the enterprise is increased. In addition, the existing calibration equipment for the outer diameter of the steel pipe is complex, takes up a large space, and has high production and maintenance costs. The steel pipe is easily damaged during the calibration process. Affect the appearance and quality of the steel pipe

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