Sizing die for densifying surface of sintered body, production method using same, and product obtained therefrom
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United States of America Patent
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Apr 14, 2020
Grant Date -
Nov 30, 2017
app pub date -
Mar 11, 2016
filing date -
Mar 31, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
In a die for compressing and sizing a sintered body at straight portions, upper taper portions are provided on a die upper portion and a core rod upper portion, and the straight portions are provided at a die lower portion and a core rod lower portion. The die upper portion and the core rod upper portion have Young's moduli higher than the die lower portion and the core rod lower portion. The die upper portion and the core rod upper portion are made of materials having Young's moduli that are at least 50 GPa higher than that of the sintered body. The sintered body can be densified with a smaller ironing margin. Since the sintered body is ironed without being compressed, by the upper taper portions and the core rod upper portion having high Young's moduli, the die is prevented from breaking and being abraded due to ironing.
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