Forging tool

Patent metadata

Field	Value
Publication number	US-11529671-B2
Application number	US-202017026520-A
Country	US
Kind code	B2
Filing date	Sep 21, 2020
Priority date	Mar 28, 2018
Publication date	Dec 20, 2022
Grant date	Dec 20, 2022

Abstract

A forging tool used to forge a workpiece in a cuboidal forging space, wherein (a): the forging space is formed when the bottom surface of the first die and the bottom surface of the second die are brought into contact with the contact surface of the third die, or (b): the forging space is formed when a first die contact surface provided in the first die and a second die contact surface provided in the second die are brought into contact with each other.

First claim

What is claimed is:

1. A forging tool, wherein
the forging tool is used to forge a workpiece in a cuboidal forging space by using a first wall surface, a second wall surface adjacent to the first wall surface, a third wall surface that faces the first wall surface and is adjacent to the second wall surface, a fourth wall surface that faces the second wall surface and is adjacent to the first wall surface and the third wall surface, a fifth wall surface adjacent to the first to fourth wall surfaces, and a sixth wall surface that faces the fifth wall surface and is adjacent to the first to fourth wall surfaces, wherein
the forging tool at least includes
a first die that forms the first wall surface and the second wall surface, and
a second die that forms the third wall surface and the fourth wall surface, and wherein
the forging tool satisfies
(a): the forging tool further includes, in addition to the first die and the second die, a third die that forms the sixth wall surface in a region surrounded by a contact surface when a bottom surface of the first die and a bottom surface of the second die are brought into contact with the contact surface; the first die forms a triangular region two sides of which are, of the fifth wall surface, a line of intersection of the first wall surface and the fifth wall surface and a line of intersection of the second wall surface and the fifth wall surface; the second die forms a triangular region two sides of which are, of the fifth wall surface, a line of intersection of the third wall surface and the fifth wall surface and a line of intersection of the fourth wall surface and the fifth wall surface; the workpiece is pressed between the fifth wall surface and the sixth wall surface; and the forging space is formed when the bottom surface of the first die and the bottom surface of the second die are brought into contact with the contact surface of the third die, or
(b): the second die forms the fifth wall surface and the sixth wall surface; the first die has a first mating surface coplanar with the first wall surface and continuous with the first wall surface; the second die has a first facing surface that faces the first mating surface and that is brought into contact with the first mating surface; the second die further has a second mating surface coplanar with the third wall surface and continuous with the third wall surface; the first die has a second facing surface that faces the second mating surface and that is brought into contact with the second mating surface; the first facing surface, the second facing surface, the first mating surface, and the second mating surface are inclined relative to a plane perpendicular to a direction of a load so as to allow the second facing surface to move along the second mating surface and the first mating surface to move along the first facing surface when the load is applied to the first die and the second die in an axial direction of the forging tool; the workpiece is pressed between the second wall surface and the fourth wall surface; and the forging space is formed when a first die contact surface provided in the first die and a second die contact surface provided in the second die are brought into contact with each other.

2. The forging tool according to claim 1 , wherein
an angle formed between the first wall surface and the second wall surface and an angle formed between the third wall surface and the fourth wall surface are greater than 90°.

3. The forging tool according to claim 1 , wherein the forging tool further satisfies (a) such that
the first die and the second die are members formed so as to become, when the first die and the second die are combined with each other, a columnar body in which the forging space opens into a bottom surface formed by the bottom surface of the first die and the bottom surface of the second die, wherein
an outer circumferential surface of the columnar body is inclined so as to approach an axis of the forging tool from the bottom surface of the columnar body toward an upper surface opposite the bottom surface, and wherein
the forging tool further includes a cylindrical member that is disposed at the outer circumferential surface of the columnar body which has a bottom surface formed to be flush with the bottom surface of the columnar body.

4. The forging tool according to claim 3 , wherein
the outer circumferential surface of the columnar body is inclined relative to the axis of the forging tool by an angle greater than or equal to 3° but not greater than 10°.

5. The forging tool according to claim 3 , wherein
the third die has a bottomed cylindrical recess that has a bottom surface including the contact surface and that has an inner circumferential surface rising from the bottom surface, and a diameter of the bottom surface of the recess is coincident with an outer diameter of the bottom surface of the cylindrical member.

6. The forging tool according to claim 5 , wherein
an inner circumferential surface of the third die is inclined so as to be separated from the axis of the forging tool from the bottom surface toward an opening surface opposite the bottom surface.

7. The forging tool according to claim 6 , wherein
the inner circumferential surface of the third die is inclined relative to the axis of the forging tool by an angle greater than or equal to 0.5° but not greater than 10°.

8. The forging tool according to claim 6 , wherein
the forging tool has a guide surface that is provided at an outer circumference of the bottom surface of the cylindrical member, and the guide surface faces the inner circumferential surface of the third die and is brought into contact with the inner circumferential surface of the third die when the guide surface is brought into contact with the contact surface of the third die.

9. The forging tool according to claim 1 , wherein the forging tool further satisfies (a) such that
the first die and the second die are members formed so as to become, when the first die and the second die are combined with each other, a columnar body in which the forging space opens into a bottom surface formed by the bottom surface of the first die and the bottom surface of the second die, and wherein
the third die has a bottomed cylindrical recess that has a bottom surface including the contact surface and that has an inner circumferential surface rising from the bottom surface, and a diameter of the bottom surface of the recess is coincident with an outer diameter of the bottom surface of the columnar body.

10. The forging tool according to claim 9 , wherein
an inner circumferential surface of the third die is inclined so as to be separated from the axis of the forging tool from the bottom surface toward an opening surface opposite the bottom surface.

11. The forging tool according to claim 10 , wherein
the inner circumferential surface of the third die is inclined relative to the axis of the forging tool by an angle greater than or equal to 0.5° but not greater than 10°.

12. The forging tool according to claim 10 , wherein
the forging tool has a guide surface that is provided at an outer circumference of the bottom surface of the columnar body, and the guide surface faces the inner circumferential surface of the third die and is brought into contact with the inner circumferential surface of the third die when the guide surface is brought into contact with the contact surface of the third die.

13. The forging tool according to claim 1 , wherein the forging tool further satisfies (b) such that
the second die contact surface is formed on a side of the first facing surface opposite the fourth wall surface so as

Assignees

• Ngk Insulators Ltd
• Miura Hiromi

Inventors

• Miura Hiromi
• Muramatsu Naokuni
• Kawamoto Tadahiro

Classifications

• B21J1/02

  Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough (modifying the physical properties by deformation C21D7/00, C22F1/00) · CPC title

• B21J13/02 Primary

  Dies or mountings therefor · CPC title

• B21J13/025

  Dies with parts moving along auxiliary lateral directions · CPC title

• C21D7/00

  Modifying the physical properties of iron or steel by deformation (apparatus for mechanical working of metal B21, B23, B24) · CPC title

• B21J1/025 Primary

  affecting grain orientation · CPC title