Ceramic-metallic composite cladding layer top head for tube inserting machine and method for producing the same

Abstract

The invention discloses a plug of a cladding layer which is made of ceramic-metal composite materials and used for pipe lining machines and a process for preparation. The invention belongs to the application field of metal pipe rolling mills. The cladding layer which is made of the ceramic-metal composite materials and has thickness of 2.5-5mm is clad on the working conical surface of the plug and nasal portion end face through using a cladding method of plasma arcs. The cladding layer and matrix materials are bonded metallurgically with a process that die steel and structural steel are taken as the matrix materials, the matrix materials are processed into a designed size of the plug, the cladding method of plasma arcs is used to enable powder-cored wires to be clad on the working conical surface of the plug and the nasal portion end face under high-temperature effects of the plasma arcs, the cladding layer which is made of the ceramic-metal composite materials and has the thickness of 2.5-5mm is obtained through single-layer claddings and lapping claddings. The geometry size of a nasal portion of the plug can reach a designed size through turning and grinding to the cladding layer. The invention has the advantages of long service life, non-molybdenum and low cost, and the invention increases pipe lining quality.

Description

technical field [0001] The invention belongs to the application field of metal pipe rolling mills, and in particular relates to a cladding layer plug of ceramic-metal composite material for a pipe threading machine and a preparation method thereof. Background technique [0002] The pipe threading machine head is an important thermal processing die in the production of seamless steel pipes. Because the plug needs to withstand high temperature thermal shock and cyclic extrusion force during work, its service life is relatively short. Generally, a special heat treatment process is adopted for the plug, so that the plug undergoes controllable oxidation treatment to form a three-layer structure of surface oxide layer, intermediate layer and transition layer. Under the repeated action of cyclic high temperature and extrusion force, the main failure forms on the surface of the plug are the peeling of the surface oxide skin, flat nose, longitudinal cracking of the plug due to fatig...

AI Technical Summary

Problems solved by technology

Under the repeated action of cyclic high temperature and extrusion force, the main failure forms on the surface of the plug are the peeling of the surface oxide skin, flat nose, longitudinal cracking of the plug due to fatigue, and bonding of steel pipes, etc., which directly affect the life of the plug and the product qualification rate.

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