Big into analytical castor castor cast iron wheel core contraction is influenced by what factors

In general, the caster casting during solidification, its parts size is generally going to shrink, casting size smaller percentage, called casting line shrinkage or casting shrinkage rate. Manufacturing mold ( Including core box) , according to determine the casting shrinkage rate, amplify mold, to ensure the size of cooling after casting meets the requirements. Various sizes in the casting cooling shrinkage can be made under: obtained from shrinkage = casting size & times; The casting shrinkage factors, which affect the casting shrinkage is more, the main are: 1. , casting material casting, casting shrinkage rate is different also. For example, shrinkage rate is greater than gray cast iron cast steel; Gray cast iron, sulfur in shrinkage rate increases, silicon for shrinkage rate decreases. 2. , casting the structure of the complex structure contraction of the casting is difficult, casting shrinkage rate decreases. For example, the same composition of casting steel, structure shape is different, with the largest free shrinkage of shrinkage. 3. , cast rolled cast concession sex good, casting shrinkage rate increased. For example, with a wet sex and sodium silicate sand mold cast castings than dry type casting casting shrinkage rate. Similarly, increase with the size of the casting, casting the rolled back, the casting shrinkage rate is reduced. So the casting shrinkage rate combined with actual situation to choose. Size requires precise casting, casting shrinkage according to try pouring castings. The same casting, due to structural reasons, the axial and radial or length, width and height of three directions of shrinkage rate may not be consistent. For more precise casting size requirement, different shrinkage rate must be taken in all directions. In actual production, the general casting, especially the casting size is not big, in every direction with the same shrinkage rate, although this will cause some error, but the error is general not big, which greatly facilitate mold processing and manufacturing. Zhongshan big into castor co. , LTD. , owns a modern factory covering 30000 square meters, is a production of various specifications of industrial casters series, casting products, electroplating products, industrial trolley, stamping sheet metal, plastic, PU casting and other products of professional manufacturers. Hotline: 400 600 - 8532 this paper label: big into castor casters a: big into castor choice is analysed under the three problems of heavy duty castor should know a: big into castor for you on handling cart castor castor and machine usage instructions