Method for controlling wall thickness of hollow pipe

Abstract

The invention provides a method for controlling wall thickness of a hollow pipe. The method comprises the following steps that the outer surface and the inner surface of the hollow pipe are detected, outer concave points on the outer surface and inner concave points on the inner surface are found, pressing is carried out on the positions, corresponding to the inner concave points, of the outer surface of the hollow pipe, and turning is carried out on the outer surface of the hollow pipe. According to the control method, the uniformity of the wall thickness of the hollow pipe is guaranteed, the method is simple, operation is convenient and fast, the service life of the hollow pipe can be prolonged, deviation or bending of the hollow pipe caused by the wall thickness difference problem in the using process is reduced, and potential risks in the using process are reduced.

Description

technical field [0001] The invention relates to the technical field of uniform wall thickness control, in particular to a method for controlling the wall thickness of a hollow tube. Background technique [0002] The wall thickness of the hollow tube is kept uniform, which can prolong the service life of the hollow tube, reduce the deviation or bending of the hollow tube caused by the difference in wall thickness during use, and reduce the hidden risks during use. According to different industry standards, the specified thickness deviation standard will also be different, so it is necessary to further correct the wall thickness of the hollow tube. [0003] CN201735796U discloses a device for controlling the uniformity of the wall thickness of the powder porous pipe, including a wall thickness uniform controller that can move vertically up and down in the cold isostatic pressing molding die for the formed powder porous pipe and a drive wall thickness uniform controller vertica...

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Problems solved by technology

[0003] CN201735796U discloses a device for controlling the uniformity of the wall thickness of the powder porous pipe, including a wall thickness uniform controller that can move vertically up and down in the cold isostatic pressing molding die for the formed powder porous pipe and a drive wall thickness uniform controller vertically up and down Mobile traction device; the uniform wall thickness controller is a mobile powder leakage ring with a cavity inside and a plurality of powder leakage holes evenly arranged on it. Between the isostatic pressing mold and the mandrel, and the inner and outer diameters of the movable powder leaking ring are respectively the same as the diameter of the mandrel and the inner diameter of the cold isostatic pressing mold, the cold isostatic pressing mold, the mobile powder leaking ring and the mandrel Coaxial layout is carried out from the outside to the inside, but the wall thickness of the forming mold obtained by the device does not necessarily meet the subsequent wall thickness uniformity requirements, and further correction is required

By blowing the thinner point with high-pressure air to make its temperature lower than the thicker point, the tensile resistance of the steel pipe is enhanced, and the actual thinning of the wall thickness becomes smaller, so as to achieve the purpose of controlling the uniformity of the wall thickness of the heat-expanded steel pipe, but the device obtains The wall thickness of the forming mold does not necessarily meet the subsequent wall thickness uniformity requirements, and further correction is required

[0005] CN202162994U discloses a pipe wall thickness uniformity control system, including an information collection part, an information processing part, and an output control part. The information collection part includes a weight collection unit, a screw speed measurement unit, and a traction speed measurement unit. The information collection part and The information processing part is connected, and the collected information is input into the information processing part; the information processing part calculates the input information and compares it with the original parameters set, and is connected with the output control part, and inputs the result to the output control part. part; the output control part is connected with the screw drive part and the traction drive part, and controls the screw speed or traction speed according to the input result, but the structure of the control system is complex

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