Performance test of auto parts
1、 Engine cylinder sealing test
There are seven factors that affect the tightness of the cylinder, including the wear of the cylinder, the damage of the piston ring, the wear of the piston, the damage of the valve seat, the wear of the valve guide, the damage of the cylinder gasket, and the valve clearance.
What are the commonly used diagnostic methods? The main measures are measuring cylinder pressure, crankcase air leakage, cylinder leakage and air leakage rate, vacuum degree of intake pipe and vibration measurement of abnormal noise caused by excessive wear of cylinder piston group. Wear metal in the crankcase is the measurement of particle content.
For the measurement of cylinder compression pressure, it is mainly the pressure at the end of compression of four stroke engine. Due to the pressure of cylinder, viscosity of oil and the matching of cylinder piston group, whether the adjustment of the valve distribution mechanism is correct and the sealing property of cylinder gasket are factors, the sealing condition of cylinder piston group can be diagnosed when measuring the pressure of engine cylinder. If the sealing performance of piston ring, valve and cylinder gasket is good, the valve clearance must be carried out Appropriate.
2、 Soundness test of muffler
The muffler is composed of outer cylinder and internal honeycomb. The two parts are combined by mechanical buckle technology because of the special environment such as high temperature and vibration. We know that the quality of this process depends on the precision of design. If it is not firmly combined in the use of automobiles, it will loose or fall off due to high temperature, vibration and other factors. But let us rest assured that the relevant quality first Department has put forward quite strict requirements on the technical aspect.
For the practical testing methods, the industry testing tools are all used universal material testing machine, and the compression plate clamp is used to make the muffler two components subject to the relevant shear force. The repeated error of the measured results shall be less than 5%.
3、 Interior inspection
The interior decoration includes seat forming material, interior box decoration material and adhesive for bonding. The main detection of its safety: 1. gas harmful 2. flame retardant.