Auto parts performance testing
Release time:
2024-03-12 10:15
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I. Engine Cylinder Sealing Test
There are seven factors that affect the sealing of the cylinder, mainly including cylinder wear, piston ring damage, piston wear, valve seat damage, valve guide wear, cylinder gasket damage, valve clearance and other problems.
What are the commonly used diagnostic methods: mainly measuring cylinder pressure, crankcase blow-by volume, cylinder air leakage and air leakage rate, intake pipe vacuum, vibration measurement of abnormal noise caused by excessive wear of the cylinder piston group, crankcase The wear metal inside is the determination of particle content.
For the measurement of cylinder compression pressure, it is mainly the pressure at the end of compression in a four-stroke engine. Due to the cylinder pressure and the viscosity of the oil and the cylinder piston group, whether the adjustment of the valve mechanism is correct, the sealing of the cylinder gasket and other factors, so when measuring the pressure of the engine cylinder, the cylinder piston group can be diagnosed If the sealing condition of the piston ring, valve, and cylinder gasket is good, then the valve clearance must be appropriate.
II. Silencer firmness detection
The muffler is composed of an outer cylinder and an inner honeycomb. The two parts are combined by a mechanical wrapping process due to high temperature, vibration and other special environments. As we all know, 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 car. However, it can be assured that the relevant quality first department has put forward quite strict requirements on this technology.
For the actual detection methods, the detection tools in the industry all use universal material testing machines and pressure-resistant disc clamps to make the two components of the muffler subject to the upper and lower shear forces. The repeated error of the measured results should be less than 5%.
III. Interior Trim Inspection
The interior includes the seat forming material, the interior box decoration material and the adhesive for bonding. The main detection of its safety: 1. gas harmful 2. flame retardant.
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Auto parts performance testing
There are seven factors that affect the sealing of the cylinder, mainly including cylinder wear, piston ring damage, piston wear, valve seat damage, valve guide wear, cylinder gasket damage, valve clearance and other problems.
Development History of Ductile Iron
According to modern archaeological research, a large number of cast iron-related relics and relics have been found at the back end bay cast iron site in Xinzheng Zheng Han's old city. The back end bay cast iron site is located in the southwest of Dongcheng District in Xinzheng Zheng Han's old city, covering an area of nearly 100000 square meters. The site is an official handicraft workshop for casting tools and farm tools in the capital of South Korea in the middle and late Warring States period. Decarbonization kiln was first discovered at the cast iron site in Tuiouwan, Henan Province, advancing the history of ductile iron in China by at least 200 years. It is at least 2000 years earlier than the West.
Building steel pipe scaffold fastener
Construction steel pipe scaffold fastener is an indispensable and important accessory on the construction site, which is used to connect and fix the steel pipe scaffold. Its precise length ensures the safety and stability of the project. Generally made of high-quality steel, with good compression and impact resistance. Fastener surface is smooth, galvanized anti-corrosion and anti-rust, prolong service life. Various specifications, suitable for steel pipes of different diameters, convenient installation, convenient disassembly, recyclable use, and effective cost saving. In the construction site, play a key role in ensuring the smooth progress of the project. Therefore, the selection of high-quality scaffolding fasteners is essential to ensure building safety.
Basic characteristics of gray iron castings
Clay content and silt content. High clay content of sand, with the specific pressure rise strength also increased, usually effective bentonite control in 7% to 10%. The sum of effective clay and dead clay in the molding sand is equivalent to the silt content, which is generally controlled at 12% ~ 16%. The mud content is too high or too low will affect the performance indicators of the sand.
Now it has 2 excellent automatic casting production lines of Denmark Disha, with an annual production capacity of 50000 tons of various castings. The company's construction fasteners,
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