Factors Influencing The Hardness of Aluminum Bronze H5114 in Ball-Burnishing Process

Abstract

     The  objective  of  this  research  was  to  examine  the  factors  affecting  the hardness  of  aluminum  bronze  H5114  in  the  pressing  process.  In  the  surface  pressing, it  is a  process  to  increase  the  hardness  of  the  surface  layer  of  the  workpiece  with  a  roller  (Ceramic  Ball) by  rolling  freely  on  the  surface  of  the  workpiece. The  hard  pressing  process  creates  a  flat  surface. It  can  increase  the  hardness  of  the  workpiece  to  suit  the application. However, there  are  many  factors  involved  in  rolling  hard  surfaces. Therefore, this  research  aims  to  study  the  variables  affecting  the  hardness  of  aluminum  bronze  H5114. In  this  study, the aluminum  bronze  material  H5114  was  used  for  hard  surface  rolling  experiments  with  quenching  force  in  3  presses  at  100, 200  and  300  bar, 1  stage  of  feed  at  0.5  mm.  speed  1000  mm./min., feed  rate  0.05  mm/rev.  Ceramic  ball  size  6  mm. of  Aluminum  Bronze  H5114.

     From  the  experiments  under  the  specified  variables, it  was  found  that  the  physical  structure  of  the  pressed  workpiece  with  high  pressure  and  the  league  feed  distance  of  0.5  mm.  affects  the  compaction  of  the  microstructure, the  size  of  the  grain  with  the  dense  arrangement. And  the  smaller  grain  characteristics  resulted  in  higher  hardness  values  as  well. Optimal  values  from  the experiment  is  to  cut  with  a  pressure  of  300 bar  at  a  distance  of  0.5  mm. From  the  analysis, it  was  concluded  that  at  a  pressure  of  300  bar, a  depth  of  0.5  mm, a  surface  depth  of  0.02  mm, the  hardness  of  aluminum bronze  H5114  The  most  is  315.7  HV.