Rotary cutting blade material and method for manufacturing the same

• US 10,702,926 B2
• Filed: 08/10/2017
• Issued: 07/07/2020
• Est. Priority Date: 10/07/2016
• Status: Active Grant

• Current Assignee: Sumitomo Electric Hardmetal Corp (Sumitomo Corporation)
• Original Assignee: Sumitomo Electric Hardmetal Corp (Sumitomo Corporation)
• Inventors: Higashi, Taisuke, Kukino, Satoru
• Primary Examiner(s): Addisu, Sara
• Application Number:
  US15/776,138
• Publication Number:
  US 20180345380A1
• Time in Patent Office: 1,062 Days
• CPC Class Codes: B22F 2005/001 Cutting tools, earth boring or grinding tool other than table ware
• CPC Class Codes: B22F 2301/20 Refractory metals
• CPC Class Codes: B22F 2302/10 Carbide
• CPC Class Codes: B22F 2302/205 Cubic boron nitride
• CPC Class Codes: B22F 3/14 simultaneously
• CPC Class Codes: B22F 5/00 Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
• CPC Class Codes: B22F 7/06 of composite workpieces or articles from parts, e.g. to form tipped tools B22F7/002 takes precedence
• CPC Class Codes: B22F 7/062 involving the connection or repairing of preformed parts
• CPC Class Codes: B23B 2226/125 cubic [CBN]
• CPC Class Codes: B23B 2226/315 polycrystalline [PCD]
• CPC Class Codes: B23B 2240/08 Brazed connections
• CPC Class Codes: B23B 2260/124 Screws
• CPC Class Codes: B23B 51/00 Tools for drilling machines
• CPC Class Codes: B23C 2226/125 cubic [CBN]
• CPC Class Codes: B23C 2226/315 polycrystalline [PCD]
• CPC Class Codes: B23C 2228/10 Coating
• CPC Class Codes: B23C 2240/08 Brazed connections
• CPC Class Codes: B23C 2240/24 Connections using screws
• CPC Class Codes: B23C 5/16 characterised by physical features other than shape
• CPC Class Codes: B23C 5/18 with permanently-fixed cutter-bits or teeth
• CPC Class Codes: C22C 2026/003 : Cubic boron nitrides only
• CPC Class Codes: C22C 27/04 : Alloys based on tungsten or molybdenum
• CPC Class Codes: C22C 29/08 : based on tungsten carbide

Abstract

A rotary cutting blade material has an attaching structure forming portion that is to serve as an attaching portion to the shank, a cutting structure forming portion that is to serve as a cutting blade, and a joint portion. The cutting structure forming portion has a core portion and a surface portion provided on the attaching structure forming portion with the joint portion being interposed, and the surface portion covers at least a part of a surface of the core portion. The attaching structure forming portion includes a hard material including a hard component and one or two or more types of iron group elements, and the hard material has a Young'"'"'s modulus of not more than 350 GPa. The core portion includes a cemented carbide material, and the surface portion includes PCD or CBN.

Claims

1. A rotary cutting blade material for a rotary cutting blade attached to a shank for use,

the rotary cutting blade material having an attaching structure forming portion that is to serve as an attaching portion to the shank, a cutting structure forming portion that is to serve as a cutting blade, and a joint portion,

the cutting structure forming portion having a core portion and a surface portion provided on the attaching structure forming portion with the joint portion being interposed,

the surface portion covering at least a part of a surface of the core portion,

the attaching structure forming portion including a hard material including a hard component and one or two or more types of iron group elements, the hard material having a Young'"'"'s modulus of not more than 350 GPa,

the core portion including a cemented carbide material,

the surface portion including PCD (polycrystalline diamond) or CBN (cubic boron nitride),

the hard component being at least one selected from the group consisting of W (tungsten), WC (tungsten carbide), TiC (titanium carbide), TiCN (titanium carbonitride), Al₂O₃ (alumina), and a combination of at least one of CBN (cubic boron nitride) and diamond and at least one of W and WC.

2. The rotary cutting blade material according to claim 1, wherein

the surface portion covers the core portion such that the core portion is not exposed to the outside.

3. The rotary cutting blade material according to claim 1, wherein

at least a part of the joint portion is a material including one or two or more types of iron group elements.

4. The rotary cutting blade material according to claim 1, wherein

a portion of the joint portion between the attaching structure forming portion and the surface portion includes one or two or more types of iron group elements.

5. The rotary cutting blade material according to claim 1, wherein

the core portion has a hollow portion therein, and

the attaching structure forming portion has an inner core portion arranged in the hollow portion.

6. The rotary cutting blade material according to claim 1, wherein

the hard material has a Young'"'"'s modulus of less than 300 GPa.

7. The rotary cutting blade material according to claim 1, wherein

the hard material has an elongation of not more than 5%.

8. A rotary cutting blade material for a rotary cutting blade attached to a shank for use,

the rotary cutting blade material having an attaching structure forming portion that is to serve as an attaching portion to the shank, a cutting structure forming portion that is to serve as a cutting blade, and a joint portion,

the cutting structure forming portion having a core portion and a surface portion provided on the attaching structure forming portion with the joint portion being interposed,

the surface portion covering at least a part of a surface of the core portion,

the attaching structure forming portion including a hard material including W (tungsten), iron and nickel, the hard material having a Young'"'"'s modulus of less than 300 GPa and an elongation of less than 5%,

the core portion including a cemented carbide material,

the surface portion including CBN (cubic boron nitride),

a portion of the joint portion between the attaching structure forming portion and the surface portion being a material including one or two or more types of iron group elements.