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: The use of aluminum silicon alloys as automotive components is growing along with the growing desire to reduce the weight of the components used. However, aluminum alloys still have low mechanical properties, so other processes are needed to increase their hardness, one of them by heat treatment process. This alloy material is commonly used for motorcycle piston. This study aims to determine the effect of heat treatment on mechanical properties and microstructure of Aluminum Silicon A383 using the age hardening method with variations in aging temperature and different holding times. The testing of mechanical properties is done by testing the hardness and thermal conductivity. From the testing results, composition of aluminum alloy A383 composed of 73.30% aluminum, 22.08% silicon and highest hardness 105.9HB at an aging temperature 2000C within 30 minutes and the optimal value of the hardness and thermal conductivity of the aging variations performed are at temperature 2000C at holding time 88 minute. As the aging temperature increases, the hardness of aluminum increases and amount of silicon also increase.

Press tools can produce products in bulk with uniform quality and short time. The automation system applied to this press tool is a system to help channel metal plates to the press tool automatically called a feeder so that it can be called an automatic press tool. The technique that will be applied in this press tool is blanking technique. Blanking is a product of forming results that is used and is produced from one single cutting process with all forms of contour being cut in full, or the result of gradual cutting with the press tool. This research aims to design and prototype an automatic press tool to produce cake mold blanking using a pneumatic system that can work more effectively and efficiently. The research method was carried out in several stages, namely the design phase, the manufacturing stage, the assembly stage and the data analysis. The results obtained from this study produce automatic press tool blanking cake molds with a pneumatic system that is given a maximum compressive strength of 8 bars and a pressure force of 6280 N. This tool is able to produce aluminum blanking results on average of 17 to 18 pieces per minute without requiring a load high operator work.

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