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compressive stress finish vs draw polish stress risers
Draw polish creates stress risers that
lead to heat checking and cracking
Draw polishing has been used for decades to help with the
release of castings and to help the aluminum alloy to flow better over flat
surfaces. What wasn't understood, however, was the effect the stoning
(cutting edges) is having on the surface of the steel. The fact is, draw
polishing acutely cuts stress risers into the casting surface of the steel.
These stress risers often lead to aiding the start of the most frustrating
issue a die caster has with tool life...heat checking, cracking, and
possible cavitation breakout in certain affected areas.
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Draw Polish Stress Risers Shorten Die
Casting Tooling Life
stoning marks on die finish
Draw polish marks create stress risers
migrate into cracks,
heat checks, and breakout
through the life of the tool
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