Pengaruh Cetakan Sillicone Rubber dan Temperatur Tuang Lilin terhadap Kualitas Pola Lilin pada Investment Casting

Investment casting method is widely used in the industry, it could produce complex and high precision products. One of the important stage in the investment is the wax pattern production, because the quality of the cast product depends on the quality of the wax pattern. Sillicone rubber in alternative mold material has good formability, low thermal conductivity, as well as the low cost of raw materials and the processes compared with metal. Mold sillicone rubber and pour wax temperature varied 55 oC, 65 oC and 75 oC to investigate the effect of these variables on shrinkage of linear wax patterns and volume wax pattern which expressed as percentage. The lowest average of linear shrinkage is 0.65%, which obtained at temperature 55 oC. The lowest percentage of volumetric shrinkage is 7.59 %, which obtained at temperature 55 oC. Keywords : invesment casting, mold material, wax pour temperature, shrinkage