Track bushing

Patent metadata

Field	Value
Publication number	US-10287648-B2
Application number	US-201715587925-A
Country	US
Kind code	B2
Filing date	May 5, 2017
Priority date	May 5, 2017
Publication date	May 14, 2019
Grant date	May 14, 2019

Abstract

A method for production of a track bushing for an undercarriage assembly is provided. The method includes carburizing a base material of the track bushing in less than 100 minutes and to a depth of less than 1000 microns. The base material is medium carbon steel. The method includes hardening the base material. The method includes tempering the base material.

First claim

What is claimed is:

1. A method for production of a track bushing for an undercarriage assembly, the method comprising:
carburizing a base material of the track bushing in less than 100 minutes and to a depth of less than 1000 microns, wherein the base material is medium carbon steel;
hardening the base material; and
tempering the base material.

2. The method of claim 1 , wherein carburizing the base material includes carburizing the base material to a depth between 200 and 800 microns.

3. The method of claim 1 , wherein hardening the base material includes oil quenching the base material.

4. The method of claim 1 , wherein hardening the base material includes:
cooling the base material; and
water quenching the base material.

5. The method of claim 4 , wherein cooling the base material includes air cooling the base material.

6. The method of claim 1 , wherein hardening the base material includes:
cooling the base material; and
dual scan induction hardening the base material.

7. The method of claim 1 , wherein the medium carbon steel contains between 0.4 and 0.6% carbon by weight.

8. The method of claim 1 , wherein the track bushing includes an inner curved surface area, an outer curved surface area, a first end ring, and a second end ring, and wherein carburizing the base material includes carburizing the inner curved surface area, and the first and second end rings.

9. The method of claim 8 , wherein carburizing the base material further includes carburizing the outer curved surface area.

10. The method of claim 1 , wherein carburizing the base material includes carburizing the base material to a depth of about 200 microns in 28 minutes.

11. The method of claim 1 , wherein carburizing the base material includes carburizing the base material to a depth of about 800 microns in less than 60 minutes.

Assignees

• Caterpillar Inc

Inventors

• Rathod Chandrasen Rameshlal
• Lin Tao

Classifications

• C23C8/22

  of ferrous surfaces · CPC title

• C21D1/60

  Aqueous agents · CPC title

• C21D9/085 Primary

  Cooling or quenching · CPC title

• C21D1/18

  Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62) · CPC title

• C21D1/42

  Induction heating · CPC title