Influence of Pouring Temperatures to Fluidity of Aluminium Scrap Cans with Investment Casting Using Natural Clays as Mould Materials

Pekanbaru area produced scrap of beverage cans; an average of 4.5 tons per month by a scrap collector and it will increase every time. The Pekanbaru area also has natural clays, which can be used as mold material for investment casting. Processing of aluminum cans into a product using the natural clays as a mold in investment casting method will add the economic value of aluminum scrap cans. Study of fluidity is necessary to obtain USAble information before creating of cast part design. This research aims to investigate the influence of pour temperatures to fluidity for the aluminum scrap cans casting, in natural clays. In this research used the pouring temperature variables: 650oC, 700oC and 750oC. Results showed the fluidity at pour temperatures of 650oC, 700oC, and 750oC approximately of 213.88 mm, 292 mm, and 360.97 mm, respectively. Results also showed that the fluidity was increased as well as increasing the pour temperatures. The fluidity increased 78.12 mm or 36.52% at pour temperatures of 650oC to 700oC, and it increased 68.97mm or 23.62% at pour temperatures of 700oC to 750oC

Analisis Pengaruh Ukuran Serbuk Kaca pada Pembuatan Kanvas Rem Sepeda Motor dengan Pengisi Serbuk Piston Bekas

Waste glass and piston can be used as alternative material to non-asbestos brake pads with powder metallurgy method. Waste glass was used as a reinforce, the piston was used as a filler, and phenolic resin was used as a binder. This study purposes to investigates the influence of size the glass powder particles on the wear resistance and hardness. The powders composition of phenolic resin, piston, and glass was 40%, 40% and 20% respectively, based on volume fraction. The glass powder was mixed in three varied sizes which is 60, 80, and 100 mesh. The mixing process was conducted in 30 minutes mixing time at 45 rpm. 166 bar preliminary pressure was applied at the beginning of single action compacting for 2 minutes then 196 bar and in single action hot compacting at 150°C for 5 minutes, then it was sintered at 150°C for 4 hours. Then, the samples were followed hardness test and wear test. The results showed the composition of the 60 mesh glass has the closest hardness and wear value to the commercial product which is 41.296 HVN and 8.2795 x 10-12 m3/m

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 castproduct depends on the quality of the wax pattern. Sillicone rubber in alternative mold material has goodformability, low thermal conductivity, as well as the low cost of raw materials and the processes compared withmetal. Mold sillicone rubber and pour wax temperature varied 55 ºC, 65 ºC and 75 ºC to investigate the effectof 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 ofvolumetric shrinkage is 7.59 %, which obtained at temperature 55 ºC