Motor Springs,Torsion Spring Motor Spring,Adjustable Steel Tension Spring Compression Springs ,Stampings,Extension Springs Co., Ltd. , http://www.ns-springs.com
Metal to casting compared to sand casting: There are many technical and economic advantages.
1. The castings produced by metal type have higher mechanical properties than sand castings. The same alloy, the tensile strength can be increased by about 25% on average, the yield strength is increased by about 20% on average, and the corrosion resistance and hardness are also significantly improved; 2. The precision and surface finish of the casting are higher than that of the sand casting, and the quality and dimensional stability are stable. 3, the casting process yield is high, the liquid metal consumption is reduced, generally can save 15 to 30%; 4, no sand or less sand, generally can save modeling materials 80 ~ 100%.
In addition, the metal mold casting has high production efficiency; the cause of defects in the casting is reduced; the process is simple, and mechanization and automation are easily realized. Metal casting has many advantages, but it also has shortcomings. Such as: 1, metal type manufacturing cost is high; 2, metal type is airtight, and no concessibility, easy to cause casting defects, cracking or castings such as white days; 3, metal casting, mold working temperature, The casting temperature and casting speed of the alloy, the time the casting stays in the mold, and the coating used are sensitive to the quality of the casting and require strict control.
Castings currently available for metal casting have certain limitations in terms of weight and shape, such as castings with simple shapes for ferrous metals; castings should not be too heavy; wall thickness is limited, and smaller casting walls are available. Thick can not be cast. Therefore, when deciding to use metal casting, the following factors must be considered: the shape and weight of the casting must be appropriate; there must be sufficient batch size; the deadline for completing the production task is permitted.
Metal casting knowledge
Metal casting, also known as die casting, is a casting method in which liquid metal is poured into a metal mold to obtain a casting. The mold is made of metal and can be used repeatedly (several hundred to several thousand times).