Today, let's take a look at some knowledge about the performance testing of automotive plastic components.
1. Engine cylinder tightness inspection
Seven factors affect the tightness of the cylinder, mainly including wear of the cylinder, damage to the piston ring, wear of the piston, damage to the valve seat, wear of the valve guide, damage to the cylinder gasket, and valve clearance.
What are the commonly used diagnostic methods? There are mainly measurements of cylinder pressure, crankcase blow-by gas, cylinder leakage and leakage rate, intake pipe vacuum, and vibration measurement of abnormal noise caused by excessive wear of the cylinder-piston group. The worn metal in the crankcase is the particle content. measurement.
The measurement of cylinder compression pressure is mainly the pressure at the end of compression of a four-stroke engine. Due to the pressure of the cylinder, the viscosity of the oil and the coordination of the cylinder-piston group, whether the adjustment of the valve train is correct, the sealing performance of the cylinder gasket, and other factors, when measuring the pressure of the engine cylinder, the cylinder-piston group can be diagnosed. If the sealing performance of the piston ring, valve, and cylinder gasket is good, the clearance of the valve must be appropriate.
Second, the muffler firmness test
The muffler is composed of an outer cylinder and an inner honeycomb part. The two parts are combined by a mechanical wrapping process due to special environments such as high temperature and vibration. We know that the quality of this process depends on the precision of the design. If the combination is not firm, it will loosen or fall off due to high temperature, vibration, and other factors in the use of automobiles. But let us rest assured that the relevant quality departments have put forward quite strict requirements for this technical aspect.
For the actual testing method, the testing tools in the industry all use the material testing machine and the compression plate fixture to subject the two components of the muffler to the relevant shearing force up and down. The repetition error of the measured results should be less than 5%.
3. Detection of automotive interior parts
Automotive interior parts include seat structure materials, interior box decoration materials, and adhesives for bonding. Mainly test its safety: 1. Gas harmfulness 2. Flame retardancy.