Results:
Unwilling improvement b both have with hardness UP against the status quo.
(2) improvement in both groups improved hardness and the heat pattern changes, average hardness =95.49, CP=2.3, CPK=1.4, than the drawing size changes products hardness is high has been improved.
(3) products hardness is declining or equivalent for pull-out steel hardness, material hardness control think important point.
Future action:
Unwilling is considered good improvement B modifies the heat pattern and considering the variation of both after operations (cutting, injection) confirmed later decided to.
(2) by decision after including the variation of hardness of the material hardness standards review, materials and products data collection, analysis, implement standards review again.