Abstract
Ring die is the critical component of pellet mill, its working performance and service life directly affect the pellet quality and production cost. This work analyzed the stress distribution of ring dies with two different hole arrangements and studied the influence of stress distribution on ring die strength. It is shown that there is stress concentration at the hole edge and the stress concentration distributes along the width of ring die at the feed side, the die hole arrangement have influence on ring die strength and the effect of hole wall thickness on ring die strength increased with the wear of die hole, finally a better pattern of hole arrangement was obtained.
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