Strengthening method of surface of piercing plug of seamless steel tube rolling mill

Abstract

The invention relates to the field of seamless steel tube manufacturing, in particular to a strengthening method of the surface of a piercing plug of a seamless steel tube rolling mill. The strengthening method comprises the following steps that 1 flaw detection is conducted on the outer surface of the plug to detect whether the plug is damaged or not; 2 abrasive blasting processing and polishing processing are conducted on the outer surface of the plug which is confirmed not damaged through flaw detection; 3 the plug with abrasive blasting processing and polishing processing conducted is cleaned so as to remove dirt on the surface of the plug; 4 an abrasion-resistant layer is welded onto the outer surface, with the dirt removed, of the plug; 5 grinding is conducted on the welded surface of the plug. The strengthening method of the surface of the piercing plug of the seamless steel tube rolling mill has the advantages that according to the technology, welding strengthening is conducted on the surface of the plug on the basis that the comprehensive mechanical performance of a common plug is not influenced, the welding material is formed by adding hard alloy phase into a cobalt base, the surface of the plug is strengthened in a welding mode, metallurgical bonding of the super abrasion-resistant layer and a base of the plug is guaranteed, the mechanical performance of a plug body is not changed and after a strengthened part is abraded due to use, the part can be repaired multiple times.

Description

technical field [0001] The invention relates to the field of seamless steel pipe manufacturing, in particular to a method for strengthening the surface of a piercing plug in a seamless steel pipe rolling mill. Background technique [0002] The plug is a key tool in the production of seamless steel pipes. The quality and service life of the tool directly affect the output, quality and economic benefits of the steel pipe production. During the process of piercing the seamless steel pipe of the plug, the solid tube blank is made into a hollow capillary, and the deformation of the metal is mainly carried out on the plug. The working conditions of the perforated plug are quite harsh, not only to bear strong axial pressure, but also to overcome the strong deformation friction generated between the inner wall. Therefore, it can be considered that the perforated plug works under the condition of low cycle fatigue, so its wear and tear is the main reason affecting the service life. ...

AI Technical Summary

Problems solved by technology

Therefore, it can be considered that the perforated plug works under low cycle fatigue conditions, so its wear and tear is the main reason affecting the service life

Conventional plugs not only have a short service life, but also cannot be repaired after being damaged. In order to ensure the continuity of normal production, a large number of spare parts in stock are required, which is a great economic burden for the manufacturer.

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