Studi Kekasaran Permukaan Produk Investmen Casting Aluminium Minuman Kaleng Bekas dengan Parameter Temperatur Tuang dan Ukuran Butir Lempung

Rarefaction inside of intake manifold can improve motorcycles engine performance. Intake manifold produce by sand casting method limited for low surface roughnes. Investment casting method might produce low surface roughnes, therefore further study must carried out to observe process parameters namely pouring temperatures and clay grain size. Current study has carried out in order to observe the influence pouring temperatures and clay grain size on surface roughness. Aluminium beverage tins and local natural clay were use raw material for molding. The clay sieved to obtain grain sizes of 60, 100, 200 mesh respectively. The wax clusters were coated with ceramic slurry up to 10 mm thickness and final coat was with sika to strengthen the mould. The ceramic shell were dewaxed at 120ºC and then sintered at 350ºC for 60 minutes. Aluminium beverage tins were cast atthe pouring temperatures 650, 700, and 750°C. The surfaces products tested by surface roughness tester. Theresults show the surface roughness increases as the pouring temperature increase. At pouring temperature 650°C to 700°C was 7.15%, while at pouring temperature 650oC to 750oC was 130.27%. Surface roughness increases as the clay grain size decreases. At clay grain size 60 to 100 mesh was 8.24, while at clay grain size 60 to 200 mesh was 186.93%

Studi Fluiditas Aluminium Minuman Kaleng Cair dengan Variasi Temperatur Tuang dan Ketebalan Rongga

Pekanbaru has a potential to produce scrap of aluminum beverage cans, it is estimated about 4.5 tons per month in each collectors. Recycling of aluminum cans is still limited to transforming the cans into ingots, to produce an efficient product desing fluidity test as needed. to be examined on fluidity. Qudong method 1999, used in this research with varying pouring temperature; 650oC, 700oC, 750oC, die temperature; 100oC, 200oC, 300oC and cavity thickness; 0.5 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm. Fluidity increased with the increasing pouring temperature, with 55.77% at temperature 650oC-700oC and 72.75% at temperature 700oC-750oC. Fluidity increases with cavity thickness, maximum fluidity achieved at temperature 750oC at 4.0 mm with a length of 120 mm and minimum fluidity can be filled with molten metal is at 1.5 mm with a length of 2.67 mm

Studi Potensi Pasir Sungai di Sungai Rokan sebagai Pasir Cetak pada Pengecoran Logam

Rokan river is one of the the four biggest river in Province of Riau which contains abundant of sand. The utilization of the sand has not reached an optimum level due to the limits of information for optimal profitability with it is not documented and therefore it is used only for building's materials. However some literatures indicate that the sand is suitable for foundry use based on the physical characteristics. In this paper, a laboratory investigations of four critical foundry properties; clay content, Grain Finest Number (GFN), moisture content, and permeability of the sand is conducted. The outcome of this research to determine the potency of Rokan river's sand as molding sand in Sand Casting. The result shows all the samples are potential as the molding sand through certain treatments. The most potential river sand is downstream river's sand with the following characteriscs: clay content 1.29%, GFN 27.25, moisture content 1.35% and gas permeability 10.9564 cm/min while the upstream river's sand: clay content 1.24%, GFN 17.94, moisture content 1.31% and gas permeability 12.6524 cm/min

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