Cylinder sleeve and surface treatment method of inner hole of cylinder sleeve

Abstract

The invention discloses a cylinder sleeve and a surface treatment method of the inner hole of the cylinder sleeve, and belongs to the field of manufacture of an internal combustion engine and parts thereof. The cylinder sleeve is prepared from a multicomponent low-alloy cast iron material which contains Cr, Mo, Cu and Ni; the inner surface of the cylinder sleeve comprises a hardened layer and a sulfurized layer, wherein the hardened layer is positioned at an inner side, and the sulfurized layer is positioned on a surface; the hardness of the hardened layer is 46-50HRC, and the thickness of the hardened layer is 0.4-2.6 mm; the thickness of the sulfurized layer is 0.001-0.005 mm, and the friction coefficient of the surface of the hardened layer is less than or equal to 0.05. The surface treatment method comprises the following steps of: carrying out quenching treatment and finish machining on the surface of the inner hole of the cylinder sleeve, and then carrying out sulfidization treatment. According to the cylinder sleeve produced by adopting the surface treatment method, the outer layer of the inner surface of the cylinder sleeve is the sulfurized layer which has an anti-friction effect, and the inner layer is an anti-abrasion layer which comprises acicular martensite and A type graphite and has higher hardness. The cylinder sleeve produced by adopting the surface treatment method can shorten the seating time of the cylinder sleeve, prolong the service life of the cylinder sleeve and is especially suitable for medium-duty and heavy-duty diesel engines.

Description

technical field [0001] The invention relates to a surface treatment method for the inner hole of a cylinder liner, and belongs to the technical field of manufacturing internal combustion engines and parts thereof. Background technique [0002] The cylinder liner is a key component mainly used in internal combustion engines such as gasoline engines, diesel engines, construction machinery, water pumps, etc. Its quality largely determines the overhaul period of internal combustion engines. Among the many types of cylinder liners, the use of cast iron cylinder liners is still the largest. However, the working environment of domestic engineering vehicles is harsh, there is a lot of dust on the construction site, and the operating speed of the engine varies greatly, resulting in serious wear of the cylinder liner and a short life. In order to solve the above problems and improve the wear resistance of the cylinder liner, the current general method is to use high frequency, laser,...

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Problems solved by technology

However, the working environment of domestic engineering vehicles is harsh, there is a lot of dust on the construction site, and the operating speed of the engine varies greatly, resulting in serious wear of the cylinder liner and a short life.

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