Machine component and method for producing the same

Patent metadata

Field	Value
Publication number	US-10730129-B2
Application number	US-201415500630-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	Nov 18, 2014
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A sprocket wheel, which is an example of the machine component, includes a base made of a first metal, and an overlay disposed in contact with the base to cover at least a part of a surface of the base. The overlay includes a matrix made of a second metal, and hard particles dispersed in the matrix. The surface of the overlay is a forged surface. The hard particles located in an overlay surface region within an average particle diameter of the hard particles from the surface of the overlay are arranged side by side while being embedded in the overlay.

First claim

The invention claimed is:

1. A machine component, comprising:
a base made of a first metal; and
an overlay disposed in contact with the base to cover at least a part of a surface of the base, the overlay including
a matrix made of a second metal, and
hard particles dispersed in the matrix and having a higher hardness than the matrix,

the overlay having a forged surface, and
the hard particles located in an overlay surface region being arranged side by side and being embedded in the overlay, the overlay surface region being a region within an average particle diameter of the hard particles from the surface of the overlay, wherein:
in an interface region that includes an interface between the overlay and the base, the overlay includes a protrusion that protrudes toward the base;
the protrusion has at least a part of a hard particle of the hard particles received therein; and
none of the hard particles have a center which is located inside of the protrusion.

2. The machine component according to claim 1 , wherein the hard particles located in the overlay surface region are arranged in contact with the surface of the overlay.

3. The machine component according to claim 1 , wherein among the hard particles located in the overlay surface region, any hard particle having a region exposed from the surface of the overlay has an acute central angle corresponding to the region exposed from the surface of the overlay.

4. The machine component according to claim 1 , wherein the machine component is a component of a tracked undercarriage, a bucket tooth, or a tooth of a crusher.

5. A method for producing a machine component, comprising the steps of:
preparing a base member made of a first metal;
forming an overlay to cover at least a part of a surface of the base member, the overlay including a matrix made of a second metal and hard particles dispersed in the matrix, the hard particles having a higher hardness than the matrix; and
forging the base member after the overlay is formed on the base member such that the overlay is worked, wherein:
in an interface region that includes an interface between the overlay and the base, the overlay includes a protrusion that protrudes toward the base;
the protrusion has at least a part of a hard particle of the hard particles received therein; and
none of the hard particles have a center which is located inside of the protrusion.

6. The machine component producing method according to claim 5 , wherein the step of forging the base member includes hot forging the base member.

7. The machine component producing method according to claim 5 , wherein the machine component is a component of a tracked undercarriage, a bucket tooth, or a tooth of a crusher.

Assignees

• Komatsu Mfg Co Ltd

Inventors

• Ohishi Masayuki
• Amano Masaharu

Classifications

• B22F5/08 Primary

  of toothed articles, e.g. gear wheels; of cam discs · CPC title

• B23K9/324

  Devices for supplying or evacuating a shielding or a welding powder, e.g. a magnetic powder · CPC title

• B23K9/23

  taking account of the properties of the materials to be welded · CPC title

• B23K2101/30

  Chains, hoops or rings · CPC title

• B23K9/046

  on surfaces of revolution · CPC title