The concept of net shape for castings

✍ Scribed by J Campbell

• Book ID: 104314308
• Publisher: Elsevier Science
• Year: 2000
• Weight: 169 KB
• Volume: 21
• Category: Article
• ISSN: 0261-3069
• DOI: 10.1016/s0261-3069(99)00072-2

✦ Synopsis

A quantitative study of the factors influencing the variability of casting dimensions has been attempted. The variability of Ž . casting size limits the achievement of a finished i.e. net shape in one operation. The casting processes include lost wax, lost Ž . Ž foam, sand casting, gravity die permanent mould casting, and high-pressure die casting. Lost wax the so-called precision casting . process is found to be highly repeatable in dimensions only for small castings, and rapidly loses repeatability as casting size increases, becoming as poor as a low technology sand casting process at sizes of approximately 1 m. The other casting processes are less influenced by casting size. Pressure die casting and high technology sand casting are found to have similar excellent performance with regard to control over casting dimensions over the whole spectrum.