| US 7,479,252 B2 | ||
| Method for manufacturing throwaway tip and apparatus for aligning green compact | ||
| Yoshikazu Okada, Yuuki-gun (Japan); Toru Narita, Yuuki-gun (Japan); and Shinsuke Fujisawa, Anpachi-gun (Japan) | ||
| Assigned to Mitsubishi Materials Corporation, Tokyo (Japan) | ||
| Filed on Mar. 26, 2004, as Appl. No. 10/810,491. | ||
| Claims priority of application No. 2003-092256 (JP), filed on Mar. 28, 2003; and application No. 2003-092257 (JP), filed on Mar. 28, 2003. | ||
| Prior Publication US 2004/0202566 A1, Oct. 14, 2004 | ||
| Int. Cl. B22F 3/12 (2006.01) | ||
| U.S. Cl. 419—38 | 25 Claims |
| 1. A method of simultaneously making a plurality of sintered articles for throwaway tips of an accuracy of at least M-grade
accuracy from green compacts, said method comprising the steps of:
filling raw material powder into a cavity formed in a die;
press forming said raw material powder to form a plurality of green compacts,
placing said green compacts on a sintering plate having a center; and
sintering said green compacts simultaneously to form said sintered articles,
wherein each of said green compacts is formed having at least one of a density gradient or a dimensional gradient, said at
least one gradient decreasing in a predetermined direction across said green compact, and
wherein each of said green compacts is substantially oriented on said sintering plate in plan view with said gradient decreasing
outwardly from the center of said sintering plate.
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