Penaruh Penambahan Al-TiB Terhadap Kekerasan Produk Pengecoran Sentrifugal Velg Alumunium A 356

Abstract

One of the problem in the small industry creating velg process, is in low quality product compared to
manufactures. Current result of research concludes that the quality product small industry is
influenced by casting method used gravity casting method. To improve its quality mechanical
properties, casting method can be designed to sentrifugal method by adding master alloy Al-TiB. This
research go in certain directionto know the influence of adding Al-TiB toward the hardness on process
of sentrifugal casting, and for determine how much the percentage of Al-TlB that results the most
optimum velg. This research conducted by using experimental method, the material used that is
aluminum A 356, added Al-TiB in the amount of 0%, 0,12%, 0,17%, 0,22%, and 27%. Along with the
casting is conducted in 400 Rpm rotation. The result of study proves the change in the hardness
effected adding variation of Al-TiB.The result of observation through the research shows that there is
impronement of mechanical properties. It is the improvement of hardness from 60,42 HRB, with
adding Al-TIB in the mount of 0,12%, and if it is compared between local velg product and maufactures
product, so as a result, there is the improvement of the hardness score from 25,17 HRB local product
and the hardness score 23,67 HRB, the manufactured product becomes 60,42 HRB by adding Al-TiB
0,12%.