Plastic deformation method for achieving structural performance optimization of inner surface of straight pipe

Abstract

The invention belongs to the field of plastic processing, and relates to a plastic deformation method for achieving structural performance optimization of an inner surface of a straight pipe. High-speed shearing deformation is carried out on the inner surface of the metal straight pipe in a point contact mode, so that the structural performance of the inner surface of the pipe fitting is optimized. The plastic deformation method for achieving the structural performance optimization of the inner surface of the straight pipe has the following technical advantages that the point contact is introduced into the high-speed shearing plastic deformation, and effective cooling in straight pipe processing is achieved; the uniformity and the collimation degree of the wall thickness is effectively guaranteed before and after straight pipe processing; a 500-micron plastic deformation surface layer is formed on the inner surface of the straight pipe, so that the hardness and the strength of the inner surface of the straight pipe are improved by 5-20 times, and the surface quality is improved until the roughness Ra is 0.02-0.2; and the chemical activity of the inner surface of the straight pipe is greatly improved, and the temperature of chemical heat treatment such as nitrizing and carburizing is reduced by 200 DEG C or above.

Description

technical field [0001] The invention belongs to the field of plastic processing and relates to a plastic deformation method for optimizing the structural performance of the inner surface of a straight pipe. Background technique [0002] In practical industrial applications, the inner surface of a large number of pipe fittings requires modification treatment to improve wear resistance, corrosion resistance and fatigue resistance. For example, oil pump barrels, oil pipelines, chemical pipelines, automobile cylinder liners in oil fields, and naval gun barrels and torpedo tubes that are still equipped in the military field, especially naval ships. The inner walls of these pipe fittings working in harsh environments need to be optimized urgently. Another example is the severe abrasive wear of metal pipes in the coal washing industry when transporting heavy particles (such as ore, coal slag) [2], resulting in a service life of about a few months to a year, frequent pipe maintenan...

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Problems solved by technology

[0005] A number of patents on surface nanotechnology have been authorized or accepted at home and abroad. Patents with self-weight publication numbers CN2400456, CN1301873, CN1336321 (equivalent patent numbers FR2812284, WO0220463, AU8408701), patents with publication numbers CN1336444 (FR2812286, WO0210461, AU8224001) The patent, the publication number is CN1336445 (FR2812285, WO0210462, AU8224101), the research is mostly on the outer surface of the metal material plate and the rotating part (rod), but there is no systematic research on the self-nanometerization of the inner surface of the pipe

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