Method of joining sintered parts of different sizes and shapes

• US 10,265,813 B2
• Filed: 03/14/2014
• Issued: 04/23/2019
• Est. Priority Date: 03/15/2013
• Status: Active Grant

• Current Assignee: Sandvik Intellectual Property AB (Sandvik AB)
• Original Assignee: Sandvik AB
• Inventors: Sweetman, Gary William, Al-Dawery, Ihsan, Fair, Jonathan
• Primary Examiner(s): Howell, Daniel
• Assistant Examiner(s): Janeski, Paul M
• Application Number:
  US14/211,105
• Publication Number:
  US 20140271003A1
• Time in Patent Office: 1,866 Days
• CPC Class Codes: B22F 2005/001 Cutting tools, earth boring or grinding tool other than table ware
• CPC Class Codes: B22F 7/062 involving the connection or repairing of preformed parts
• CPC Class Codes: B23B 2222/16 Cermet
• CPC Class Codes: B23B 2222/28 Details of hard metal, i.e. cemented carbide
• CPC Class Codes: B23B 2250/12 Cooling and lubrication
• CPC Class Codes: B23B 2250/16 Damping of vibrations
• CPC Class Codes: B23B 51/00 Tools for drilling machines
• CPC Class Codes: B23B 51/02 Twist drills
• CPC Class Codes: B23B 51/06 Drills with lubricating or cooling equipment B23B51/042 takes precedence
• CPC Class Codes: B23P 15/28 cutting tools sawing tools B23D63/00, B23D65/00; files or rasps B23D73/00
• CPC Class Codes: B23P 15/32 twist-drills
• CPC Class Codes: C22C 29/02 based on carbides or carbonitrides
• CPC Class Codes: Y10T 408/458 including nozzle
• CPC Class Codes: Y10T 408/89 Tool or Tool with support
• CPC Class Codes: Y10T 408/9095 with axially extending relief channel
• CPC Class Codes: Y10T 408/9097 Spiral channel

Abstract

A method of joining a plurality of parts to form a unitary body. At least two sintered parts are provided. At least one of the sintered parts has at least one internal channel. Each of the parts is formed of a hard metal composition of material. The at least two sintered parts are assembled into the shape of a unitary body. Each of the at least two sintered parts has a joining surface and when each joining surface is brought into contact the surfaces form a bonding interface therebetween. The assembled parts are subjected to a vacuum or gas atmosphere, without the application of external pressure, and to a temperature sufficient to fuse the at least two sintered parts together at the bonding interface to form the unitary body.

Claims

1. A method of joining a plurality of parts to form a unitary body comprising the steps of:

providing at least two previously sintered parts, each of the parts being formed of a hard metal composition of material, at least one of the previously sintered parts having at least one internal channel;

assembling the at least two previously sintered parts into a shape of a unitary body, wherein each of the at least two parts has a joining surface and when each joining surface is brought into contact the joined surfaces form a bonding interface therebetween; and

subjecting the assembled at least two parts to a vacuum or gas atmosphere, without the application of external pressure, and to a temperature sufficient to fuse the at least two previously sintered parts together at the bonding interface to form the unitary body.

2. The method of claim 1, wherein the hard metal composition of material is cemented carbide.

3. The method of claim 2, wherein the cemented carbide has a hard phase of tungsten carbide and of one or more carbides, nitrides or carbonitrides selected from the group of titanium, chromium, vanadium, tantalum, niobium bonded by a metal phase selected from the group of cobalt, nickel, iron and combinations thereof.

4. The method of claim 2, wherein each of the at least two previously sintered parts is made of the same cemented carbide.

5. The method of claim 2, wherein each of the at least two previously sintered parts is made of a different cemented carbide.

6. The method of claim 1, wherein the hard metal composition of material is a cermet.

7. The method of claim 6, wherein the cermet has a hard phase selected from the group of one or more carbides, nitrides or carbonitrides of titanium, chromium, vanadium, tantalum, niobium bonded by a metallic phase selected from the group of cobalt, nickel, iron and combinations thereof.

8. The method of claim 1, wherein the at least two previously sintered parts each having a sintering temperature, the assembled parts being heated to a temperature lower than a melting point of the previously sintered part having a lowest sintering temperature of the at least two previously sintered parts to fuse the parts at the bonding interface.

9. The method of claim 1, wherein the temperature the assembled parts are heated to of about 1340°

C. to about 1360°

C.

10. The method of claim 9, wherein the assembled parts are heated for a time period of about 10 to about 30 minutes.

11. The method of claim 9, wherein the assembled parts are heated to a temperature of about 1350°

C. for about 15 minutes.

12. The method of claim 1, wherein each of the at least two previously sintered parts has a different shape.

13. The method of claim 1, wherein the unitary body is a wear resistant tool.

14. The method of claim 1, wherein the unitary body is a tool blank.

15. The method of claim 1, wherein the unitary body is a wear part.

16. The method of claim 1, wherein each of the at least two previously sintered parts has a different size.

17. The method of claim 1, wherein the at least two previously sintered parts comprise a plurality of previously sintered parts.

18. The method of claim 17, further comprising the step of machining at least one of the previously sintered parts with the least one internal channel prior to the steps of assembling and fusing the parts together.

19. The method of claim 18, wherein a plurality of coolant holes are machined in at least one previously sintered part and the at least one previously sintered part having the plurality of coolant holes is fused to the at least one previously sintered part having the at least one internal channel.

20. The method of claim 17, wherein a plurality of internal coolant channels having predetermined angles and positions are machined in at least one previously sintered part.

21. The method of claim 17, wherein the tool is a drill and wherein a first previously sintered part forming a shank of the drill made of a first grade of hard metal composition of material, a second previously sintered part forming the point of the drill made of a second grade of hard metal composition are provided.

22. The method of claim 17, wherein the tool is a drill, each of the plurality of previously sintered parts forming a section of the drill.

23. The method according to claim 22, wherein at least two sections of the drill are formed of a different cemented carbide.

24. A wear resistant tool comprising:

a plurality of previously sintered parts, each of the plurality of previously sintered parts being formed of a hard metal composition of material, at least one of the previously sintered parts having at least one internal channel, wherein the plurality of previously sintered parts can be assembled into a shape of a unitary body; and

a joining surface disposed on each of the plurality of previously sintered parts, wherein when the parts are assembled each joining surface is brought into contact to form a bonding interface therebetween, such that when the assembled parts are subject to a vacuum or gas atmosphere, without the application of external pressure, and to a temperature sufficient to fuse the plurality of previously sintered parts, the plurality of previously sintered parts are joined together at a respective bonding interface to form the unitary body.

25. The wear resistant tool of claim 24, wherein each of the plurality of previously sintered parts has a different size.

26. The wear resistant tool of claim 24, wherein each of the plurality of previously sintered parts has a different shape.

27. The wear resistant tool of claim 24, wherein the hard metal composition of material is cemented carbide.

28. The wear resistant tool of claim 27, wherein the cemented carbide has a hard phase of tungsten carbide and of one or more carbides, nitrides or carbonitrides selected from the group of titanium, chromium, vanadium, tantalum, niobium bonded by a metal phase selected from the group of cobalt, nickel, iron and combinations thereof.

29. The wear resistant tool of claim 27, wherein each of the plurality of previously sintered parts is made of the same cemented carbide.

30. The wear resistant tool of claim 27, wherein each of the plurality of previously sintered parts is made of different cemented carbide.

31. The wear resistant tool of claim 24, wherein the hard metal composition of material is a cermet.

32. The wear resistant tool of claim 31, wherein the cermet has a hard phase selected from the group of one or more carbides, nitrides or carbonitrides of titanium, chromium, vanadium, tantalum, niobium bonded by a metallic phase selected from the group of cobalt, nickel, iron and combinations thereof.

33. The wear resistant tool of claim 24, wherein the assembled parts are heated to a temperature lower than a melting point of the lower sintering temperature of each of the plurality of previously sintered parts to fuse the parts at the bonding interface.

34. The wear resistant tool of claim 24, wherein a plurality of internal coolant channels having predetermined angles and positions are machined in at least one of the plurality of previously sintered parts.

35. The wear resistant tool of claim 24, wherein the tool is a drill and wherein a first previously sintered part of a first grade of hard metal composition of material forms a shank of the drill and a second previously sintered part of a second grade of hard metal composition of material forming a point of the drill.

36. The wear resistant tool of claim 24, further comprising a plurality of coolant holes in at least one of the plurality of previously sintered parts.

37. The wear resistant tool of claim 36, wherein the part having the coolant holes is fused to the at least one plurality of previously sintered parts having the at least one internal channel.