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.