In foundry production, the porosity and shrinkage of castings are sometimes associated, and sometimes are independent groups. When there are air holes and shrinkage holes, it is necessary for us to quickly judge whether the defect is air holes or shrinkage holes. In order to quickly judge these two defects, we must first have a good understanding of their characteristics. Today, we will teach you how to quickly judge stomatal and shrinkage defects by recognizing their characteristics....

From September 27 to October 13, 2017, the Raw Material Industry Department (Rare Earth Office) of the Ministry of Industry and Information Technology, in conjunction with experts organized by China Rare Earth Industry Association, conducted verification and investigation on some rare earth enterprises in Henan and Jiangsu provinces, focusing on the procurement, production and sales of raw materials in enterprises with comprehensive utilization of resources, and on the protection of rare earth r...

China Foundry Association German GIFA Exhibition Group 2019...