Pcd drill and manufacturing method for same
AssigneeHonda Motor Co., Ltd.
InventorsHiroyuki Fukushima, Junya Onose, Yuu Igarashi, Akihiro Osawa, Masaki Hosaka, Tomoya Kuroda
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Abstract
When forming a first preliminary flute on a PCD layer of a columnar body, electrical discharge machining is performed by setting the electrode orientation so that the first twist angle is α. Next, when forming a second preliminary flute on a substrate of the columnar body and a round bar, the grinding process is performed by setting the grinding orientation and direction for a diamond whetstone so that a second twist angle is larger than the first twist angle.
Claims5
A manufacturing method for a polycrystalline diamond drill including a body component, and a tip cutting tool formed from a substrate made of cemented carbide and a diamond layer disposed on the substrate, the manufacturing method comprising:
- a process of joining a cylindrical member which will be made into the tip cutting tool to a tip of the body component in a manner that the substrate faces the body component side;
- a process of performing electrical discharge machining on the cylindrical member to form cutting edges and thinning faces, and to expose both the diamond layer and the substrate on rake faces and the thinning faces;
- a process of performing electrical discharge machining on the diamond layer to form a first preliminary flute in a manner that the first preliminary flute is made at a first twist angle;
- and
- a process of applying grinding work to the body component and the substrate to form a second preliminary flute in a manner that the second preliminary flute adjoins the first preliminary flute and is made at a second twist angle larger than the first twist angle.
Dependencies are inferred from the claim text.