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Temperature of vacuum cast knock out from plaster mould

Pawlak M.

Archives of Foundry Engineering

2011

Vol. 11, iss. 4

97-102

The results of investigations on knocking out temperature of CuSn10, CuSn5Zn5Pb5 and AlSi11 castings vacuum prepared in gypsum moulds. The experimental castings were p rep ared in form of rings of diameters [...] 30, 20 and 10 mm, width 10mm and wall thickness g= 0,6; 0,8; 1,0 and 2,0 mm respectively. Casting temperatures were 1120 and 1200 for bronzes and 700 and 800 C for silumin. The crack sensitivity of the rings was evaluated. It can be stated, on the base of the tests, that casting should be knocked out as soon as possible after pouring basin crystallizes. In case of tested castings the limiting dimensions of the rings are diameter [...] 30 mm and and thickness g=0,8 for CuSn10. Castings made of CuSn5Zn5Pb5 and AlSi11 do not reveal the crack sensitivity.