Quality Testing Of Automotive Engine Tool

- Jul 05, 2017 -

Quality testing of automotive Engine Tool
Leakage and closing clearance are two main indicators of Engine Tool, and current domestic testing of the leakage of Engine Tool and closed gaps. The quality and efficiency of the engine are influenced by the performance of the engine tool, because the engine is one of the important parts of the engine. Above all, the importance and determination of the leakage of vehicle engine tool and the detection of closed gap. Automotive Engine Tool are mass produced and require Engine Tool to detect high efficiency, accuracy and reliability.
Engine Tool work surface must not have Nick, scratch, peeling, outer cylinder and upper and lower end face should be - on the finish, curvature deviation should not be greater than 0.02-0.04 mm, ring groove in the subsidence may not exceed the standard 0.15 0.25 mm, Engine Tool, elastic, gap within the rules. In addition, still should check Engine Tool light-leaking, flat on the Engine Tool, in the cylinder in the engine tool below puts a small lamp, on a mask, and then observe light-leaking gap between Engine Tool and cylinder wall, thus the Engine Tool are in good condition of contact with the cylinder wall.
The engine tool is one of the key parts of the engine, and its performance directly affects the performance of the engine. At the same time, the engine tool is wearing parts, maintenance Engine Tool, usually hanging out the pistons, therefore, often to repair or replace the engine tool time as the first engine overhaul period.
Wear and tear of Engine Tool
There are several characteristics of the engine tool and the wear of the cylinder liner.
The engine tool moves back and forth between the top and bottom, moving from a static state to a maximum of 30 meters per second, and doing so over and over again.
2. During the reciprocating movement, the cylinder pressure changes a lot during the intake, compression, work and exhaust stroke of the work cycle.
3. Because of the influence of combustion stroke, the engine tool motion is often under high temperature, the first gas ring, especially in high temperature and high pressure produced by chemical action, and the products of combustion, the oil film is very difficult to build, make it be difficult to achieve full lubrication, and often in the critical state of lubrication.
According to wear mechanism, engine tool wear can be divided into normal wear, melt wear, abrasive wear and corrosion wear. But these wear and tear do not appear alone, but they exist and interact with each other. According to the wear part, the engine tool wear can be divided into sliding surface wear and face wear. Generally speaking, the sliding surface wear is larger than the upper and lower face, and the sliding surface is mainly the abrasion wear and abrasive wear. The upper and lower ends are mainly caused by the impact wear caused by the reciprocating movement of the piston.
Engine tool maximum wear of the sliding surface often appear dead point position on the cylinder, because it subjected to high temperature gas, destroyed the oil film, cause is easy to melt the conditions, so as to accelerate the engine tool wear. Normally so-called normal wear actually involves a slight melting of wear and abrasion. Each ring sliding surface wear is different, the first largest gas ring wear, 2 ring is about half of the 1, for example, perfectly on the WD615 engine Engine Tool after 500 hours after the reliability test, the gas ring opening gap 1 wear is 0.4 ~ 0.4 mm, 2 way opening gap abrasion is 0.25 ~ 0.25 mm, wear ring opening gap of 0.3 ~ 0.55 mm. But sometimes the oil ring is bigger than the middle of the ring, due to the influence of the oil distribution on the cylinder surface and the absorption of impurities.