Method for manufacturing engine cylinder

Abstract

The invention relates to a method for manufacturing an engine cylinder. The method comprises the following steps of: removing oil and nickel on an aluminum alloy cylinder body; taking the cylinder body to be processed as an anode and processing the inner wall of the cylinder by using phosphoric acid solution; and taking the cylinder body to be processed as a cathode and soaking the inner wall of the cylinder by using liquid ceramic to enable the nickel and silicon carbide (SiC) in the liquid ceramic to be fixed on the inner wall of the cylinder to process the surface; and honing, scouring and cleaning the cylinder covered with a ceramic layer to obtain the cylinder. The method for manufacturing the engine cylinder has the advantages that: the manufacturing method is simple, the ceramic layer has the depth of only 40 to 100 mu m and hardly influences the heat radiation performance of the cylinder, and simultaneously, the ceramic layer has the hardness of 520 to 700 HV and has high abrasive resistance; the cylinder has high oil residential performance and high lubricating property and can shorten the seating time of the cylinder; the raw material used in the manufacturing process avoids environmental pollution substantially; and the inner wall of the cylinder is processed in a fully-closed circulating mode which has no leakage of treatment fluid, no environmental pollution and high treatment efficiency.

Description

technical field [0001] The invention relates to a manufacturing method of an engine cylinder, in particular to a manufacturing method of an engine cylinder with a ceramic layer. Background technique [0002] At present, most engine car cylinders use all-cast iron cylinders or aluminum alloy cylinders. [0003] When the engine is running, the piston makes high-speed reciprocating motion in the cylinder, which requires the engine cylinder to have good wear resistance. [0004] During the operation of the engine, a large amount of heat will be generated. If it is not dissipated in time, the heat accumulated in the cylinder will cause the engine to overheat, which will directly affect the service life of the engine. When the engine temperature is too high, it will greatly reduce the life of the engine, and even cause damage to some key parts, making maintenance difficult and costly. If the engine cylinder is overheated, it will lead to carbon deposits in the engine, and when t...

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Problems solved by technology

[0004] During the operation of the engine, a large amount of heat will be generated. If it is not dissipated in time, the heat accumulated in the cylinder will cause the engine to overheat, which will directly affect the service life of the engine.

When the engine temperature is too high, it will greatly reduce the life of the engine, and even cause damage to some key parts, making maintenance difficult and costly

If the engine cylinder is overheated, it will lead to carbon deposits in the engine, and if the engine carbon deposits are serious, it will affect the compression ratio of the combustion chamber, resulting in a sudden drop in horsepower, and even knocking

At the same time, excessive carbon deposits will also affect the movement and smoothness of the piston

[0005] The cylinder with cast iron as the cylinder body has high hardness and wear resistance, but it is bulky and poor in heat dissipation; the aluminum alloy cylinder is light in weight and good in heat dissipation, although it is strong itself, it has poor wear resistance, so it must be combined with cast iron bushings to withstand The friction when the engine is running, but it also makes the heat dissipation effect of the cylinder a little discounted

However, the manufacturing process of the cylinder combined with the cast iron liner is complicated, and the stability of the interface between the cast iron and the aluminum alloy is poor. At the same time, the inner surface of the cylinder needs to be treated with composite coating, which causes great environmental pollution.

[0006] For this reason, people have developed engine cylinders with a ceramic wear-resistant layer, but the manufacturing process of this cylinder is equally complicated and the effect is not good enough.

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