The dimensional and shape accuracy of vacuum castings prepared in plaster moulds
Journal Title: Archiwum Odlewnictwa - Year 2011, Vol 11, Issue 3
Abstract
The results of laboratory test on the dimensional and shape accuracy of bronze plaster castings CuSn10, CuSn5Zn5Pb5and AlSi11 silumin are presented in this paper. The test castings were made in form of rods of length 100mm and diameters 4 mm, 7 mm and 10mm. The temperatures of molten alloys were 1120, 1160 and 1200ºC for bronzes and 700, 750 and 800ºC for silumins. Mould temperatures 500 and 600ºC and 250 and 300ºC respectively. The relative dimension change in given technological conditions by relating to the wax model. Analogical researches were made for plate-like CuSn10 bronze castings by calculating the relative dimension change in two perpendicular axis. Obtained results allowed to state that temperature of cast alloy influences the relative dimensional change, next the mould temperature and type of material (CuSn5Zn5Pb5, CuSn10, AlSi11 relatively). The transverse dimension of the mould does not influence the dimensions of test castings. Temperature of the mould as well as casting temperature do not influence the shape accuracy of the castings.
Authors and Affiliations
M. Pawlak
Keywords
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