Method for manufacturing throwaway tip and apparatus for aligning green compact
AssigneeMitsubishi Materials Corporation
InventorsYoshikazu Okada, Toru Narita, Shinsuke Fujisawa
Life of this patent
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Abstract
A method for manufacturing a throwaway tip is presented in which a green compact Q obtained by press-forming raw material powder for the throwaway tip is placed and sintered on a sintering plate 8. The green compact Q is press-formed so that the density of the raw material powder is gradually decreased toward a predetermined direction R, and the direction R is oriented substantially toward the outer circumference of the sintering plate 8 in plan view. Thus, it is possible to obtain a throwaway tip having sintering accuracy.
Claims25
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.
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;
- 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
- 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, and
- wherein a plurality of said green compacts are divided into a plurality of green compact groups respectively extending from the center of said sintering plate toward the outer circumference thereof in plan view.
An apparatus for aligning a plurality of green compacts, comprising:
- a sintering plate holder for horizontally holding a sintering plate;
- and
- a conveyance mechanism for holding and conveying the plurality of green compacts to be placed on said sintering plate,
- wherein said sintering plate holder has a first rotation mechanism for rotating and positioning said sintering plate at each angle of rotation around its vertical axis, and
- wherein said green compact is placed on said sintering plate, so that said green compact is substantially oriented on said sintering plate in plan view outwardly from the center of said sintering plate.
An apparatus for manufacturing throwaway tips, the apparatus comprising:
- a plurality of green compacts;
- a sintering plate;
- and
- an alignment apparatus including:
- a sintering plate holder for horizontally holding a the sintering plate;
- and
- a conveyance mechanism for holding and conveying the plurality of green compacts to be placed on said sintering plate,
- wherein said sintering plate holder has a first rotation mechanism for rotating and positioning said sintering plate at each angle of rotation around its vertical axis,
- wherein each of said plurality of green compacts is placed on said sintering plate, and is substantially oriented on said sintering plate in plan view outwardly from the center of said sintering plate,
- 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 oriented on said sintering plate in plan view with said gradient decreasing outwardly from the center of said sintering plate.
Dependencies are inferred from the claim text.