Perencanaan dan Pembuatan Produk Bayonet dengan Material Kuningan melalui Proses Remelting

This research was purposed to know the cast process through the remelting from thebeginning of manufacture to the finished material and test the results of production by laboratory testing and compare it with the standards on the market. At this catingprocess the temperature reaches (800viiio -900oC). After the casting process is complete, the sand must be removed from the mold frame and castings. Furthercooling takes 30 minutes with air cooling. The physical and mechanical tests used in this study include chemical testing, microstrucrure testing and hardness testing. Thetest specimen consists of a sample of a bayonet foundation, which will be used for testing. All tests conducted at the Polytechnic Manufacturing Laboratory of Ceper Klaten. In the chemical composition test obtained content of the main elemens Cu=62,0%, Zn=32,1%, Pb=2,80% dan Sn=1,32%. The existence of Fe=0,866% elements can cause brass grains become smooth in the process of pouring. Test results can be seen from the brass microstructure is indicated by bright colors in the phase β and dark color in the phase α. From the results of hardness testing on bayonet obtained the average hardness price 86,20HB