Abstract:
The automotive industry in Thailand had grown up rapidly in the past few years.
This study focuses on reduction of defectives in a manufacturing process of an
automotive part in a case study company. Vane pump camring sintering, the focused
part, is manufactured based on sintering metal by the powder metallurgy that currently
becomes predominant in the manufacturing of automotive parts. The yield loss of
vane pump camring sintering part is over the company target at 0.85%. Tile problem
shows that the core rod distance does not conform to the specification. The specified
core rod distance is 48i0.15 mm. The root cause is found that the core rod distance
of the current die is not appropriate. Due to the behavior of sintering metal, the
part's dimension vvould be changed after the processes of compacting, sintering,
heat treatment. This study therefore proposes to redesign the die by recalculating
the coefficients of the part i.e. PSB (Pressing Spring Back), SDC (Sintering Dimension
Change) and HDC (Heat treatment Dimension Change) regarding the mentioned
processes. The calculation shows that the appropriate die's core rod distance is
48.227 mm. The Implementation of using a new die, regarding the recalculated core
rod distance, shows that the defectives of vane pump camring sintering is reduced