STUDI OPTIMALISASI KUALITAS PEMBUATAN PISTON MOTOR BERBASIS MATERIAL PISTON BEKAS

Abstract

The Foundry technology is the oldest manufacture technology in the world. It is approximately on 4000 BM. Al Quran immortalized in As-Saba at verse 11, �Make you perfect coats of mail, and balance well the rings of chain armour, and work you (men) righteousness. Truly, I am All-Seer of what you do�. Development technology in manufacture can�t be separated by foundry technology and machining technology. Both technologies will be able to produce new innovative and useful products, if they are combined in a development system of technology. Machining technology in Meulaboh, West Aceh is sufficient to support the metal casting industry. Making Piston in industry used metal mould which has press-cast system, but it is possible to make piston with the other method like gravity casting. According to the study literature, the trace piston can be recycled without loss of mechanical and physical properties. It has a good flow and the composition of materials can be changed according to what the needs. So, the raw material is no problem to make pistons. The research has proven its presumption, by controlling the temperature of casting is ± 7200C, the temperature of molding is ± 327.50C, maximum holding time is 30 minutes, using metal kowi and just simple method such as furnace with charcoal has been resulted piston. The result of spectrometer test that the trace material of piston has contains 10.21% Si in the motorcycle piston and 10.9% Si in the car piston after re-melted. So the percentage content of Si mass in trace material of piston is equal with Al-Si AC4B that is the raw material of piston, block gear, and cylinder head according JIS. Maximum tensile strength of piston is 15.8 kg/mm2. The density of piston is between 2567 until 2635 kg/m3. Maximum hardness is 48.42 kg/mm2. So, the general result of this research based on mechanical and physical properties is equal 85% of the standard piston. Therefore, we still have a challenge to improve the quality up to 100%

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