TY  - JOUR
T1  - Wear Control in Press Screws in Palm Oil Mill
AU - , Basil Okafor AU - , Steve Odi-Owei AU - , P.P. Jombo 
JO  - Journal of Engineering and Applied Sciences
VL  - 2
IS  - 6
SP  - 1058
EP  - 1060
PY  - 2007
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2007.1058.1060
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2007.1058.1060
KW  - Tensile test
KW  -hardness test
KW  -chemical analysis
KW  -press screw
KW  -material
AB  - Tests were carried out on carefully collected samples to determine the mechanical properties and chemical composition of the screws. This is aimed at recommending the best of tribological material for the system. The tensile test result shows that the ultimate tensile strength of the press screws is 1.26E07 KN m ² with an overall per cent elongation of 19.1%. Hardness test indicated that the screw is of medium hardness, with a hardness number of HRC40.10. The chemical analysis shows that the screw is a carbon steel with a carbon content  of  0.317%,  alloyed  with  Silicon  (Si)  and  Manganese  (Mn)  elements.  A  press  screw made of silicon-manganese cast steel with 1.20% carbon content, 1.27% silicon and 1.30% manganese is recommended. It is suggested that the material be hardened by heating to 1050°C and quenched in oil. Tempering is at 240°C for 6 h to ensure adequate toughness and minimal loss of hardness.
ER  -