Method for manufacturing a tool head

Patent metadata

Field	Value
Publication number	US-12036613-B2
Application number	US-201816765971-A
Country	US
Kind code	B2
Filing date	Nov 22, 2018
Priority date	Nov 24, 2017
Publication date	Jul 16, 2024
Grant date	Jul 16, 2024

Abstract

A method for manufacturing a tool head includes forming a first and a second part from a powder composition. The first and the second parts include corresponding joining surfaces, and the parts have outer surface portions configured to form portions of a peripheral envelope surface of the tool head. The method further includes forming corresponding grooves in the corresponding joining surfaces, assembling the parts into a shape of a tool head by bringing the joining surfaces into contact to form an interface, so that each pair of corresponding grooves forms a channel extending in the interface, the channel having an inlet opening in a rear end of the tool head and an outlet opening in a front end or in the peripheral envelope surface of the tool head, and joining the assembled parts in a sintering operation to form the tool head.

First claim

The invention claimed is:

1. A method for manufacturing a tool head of a rotary cutting tool, the tool head having a front end and a rear end between which a centre axis of rotation and a peripheral envelope surface extend, the method comprising:
forming at least a first part and a second part from a powder composition, wherein the first part has a first joining surface and wherein the second part has a second joining surface, the first joining surface being configured to be brought into contact with the second joining surface, wherein the first part further includes a first outer surface portion configured to form a first portion of the peripheral envelope surface of the tool head, and wherein the second part further includes a second outer surface portion configured to form a second portion of the peripheral envelope surface of the tool head;
forming at least one groove in the first joining surface and at least one corresponding groove in the second joining surface, wherein the at least one groove of the first joining surface is configured to face the at least one corresponding groove of the second joining surface when the first joining surface and the second joining surface are brought into contact;
forming at least a portion of the at least one groove with a smooth surface, wherein the smooth surface of the at least one portion of the at least one groove is a surface that has an arithmetic average roughness Ra≤3 μm, when measured in any direction, wherein the smooth surface is selected from a direct pressed surface, a grinded surface, a polished surface and a surface created by means of powder injection moulding;
assembling the first and second parts into a shape of a tool head by bringing at least the first and second joining surfaces into contact to form an interface, so that at least one pair of the facing at least one and at least one corresponding grooves forms a channel extending in the interface, the channel having an inlet opening in the rear end of the tool head and an outlet opening in the front end and/or in the peripheral envelope surface of the tool head; and
joining the assembled first and second parts in a sintering operation to form the tool head.

2. The method according to claim 1 , wherein forming the first and second parts includes using one of a powder injection moulding, multiaxial pressing, uniaxial pressing and additive manufacturing process.

3. The method according to claim 1 , wherein assembling the parts comprises assembling the parts in a non-sintered condition.

4. The method according to claim 1 , further comprising forming the first and second parts into an identical or substantially identical shape.

5. The method according to claim 1 , comprising forming the first and second parts so that, when assembling the first and second parts, the first and second joining surfaces extend along the centre axis of the tool head.

6. The method according to claim 1 , comprising forming the at least one groove as a curved groove.

7. The method according to claim 1 , wherein forming the at least one groove includes forming, in each of the first joining surface and the second joining surface, at least two grooves extending from a common depression so that, when assembling the first and second parts, at least two channels sharing a common inlet opening in the rear end of the tool head are formed in the interface.

8. The method according claim 1 , further comprising providing the tool head with at least one cutting edge, wherein the at least one cutting edge is provided in adjacency to the outlet opening of the channel.

9. The method according to claim 7 , comprising forming at least three parts, wherein a number of parts correspond to a number of cutting edges provided in the tool head.

10. The method according to claim 1 , comprising providing the first and second joining surfaces with positioning means, wherein the positioning means of the first joining surface is configured to be engageable with the positioning means of the second joining surface, such that a relative position of the first and second parts during sintering is secured.

11. The method according to claim 1 , wherein the powder composition is a hard metal powder composition or a cermet powder composition.

12. A tool head for use with a main body of a rotary cutting tool, the tool head comprising:
a front end and a rear end between which a centre axis of rotation and a peripheral envelope surface extend, wherein the rear end is configured to be connected to the main body and wherein the front end is configured for cutting engagement with a workpiece; and
at least one channel arranged for transporting liquid coolant to a cutting edge of the tool head, the at least one channel extending from an inlet opening in the rear end of the tool head to an outlet opening in the front end or in the peripheral envelope surface of the tool head, wherein the at least one channel is formed in at least one interface formed as a result of joining at least two parts to form the tool head, each part of the at least two parts being formed from a powder composition, wherein the at least one channel is formed by forming at least one groove in a first joining surface of one of the at least two parts and at least one corresponding groove in a second joining surface of another of the at least two parts, wherein the at least one groove of the first joining surface is configured to face the at least one corresponding groove of the second joining surface when the first joining surface and the second joining surface are brought into contact, and wherein at least a portion of the at least one groove has a smooth surface, wherein the smooth surface of the at least one portion of the at least one groove is a surface that has an arithmetic average roughness Ra≤3 μm, when measured in any direction, wherein the smooth surface is selected from a direct pressed surface, a grinded surface, a polished surface and a surface created by means of powder injection moulding.

13. A rotary cutting tool comprising a main body and a tool head according to claim 11 .

14. The rotary cutting tool according to claim 12 , wherein the tool head has been joined to the main body by means of sintering.

15. The method according to claim 1 , further comprising forming the at least one groove as a groove having a variable cross-sectional shape and/or size.

16. The method according to claim 1 , further comprising forming a major portion of the at least one groove with a smooth surface.

17. The method according to claim 1 , further comprising forming the entire at least one groove with a smooth surface.

Assignees

• Seco Tools Ab

Inventors

• Frejd Stefan

Classifications

• B23C5/283

  Cutting inserts with internal coolant channels · CPC title

• B22F10/20

  Direct sintering or melting · CPC title

• B23P15/34

  milling cutters · CPC title

• B23P15/32

  twist-drills · CPC title

• B23B51/06

  Drills with lubricating or cooling equipment {(B23B51/042 takes precedence)} · CPC title