公开(公告)号：US10183377B2

公开(公告)日：2019-01-22

申请号：US14962403

申请日：2015-12-08

Applicant: Caterpillar Inc.

Inventor： Jonathan Robert Crow ,  Trenton G. Jacobson

IPC: G01K15/00 ,  B24B49/14 ,  G01N25/72

Abstract: A method of standardizing a grinder burn etch test may include machining a test sample of substantially equivalent chemical composition and heat treatment to a manufactured part to be audited for grinder burn and receiving data on an expected range of thermal damage that may be caused on the manufactured part during grinding by grinder burn. The method may also include preparing the test sample by laser heat treating at least a portion of the test sample to create a range of thermal damage across predetermined areas on the test sample, wherein the range of thermal damage on the test sample encompasses the expected range of thermal damage that may be caused on the manufactured part during grinding by grinder burn. The method may still further include testing a grinder burn etch bath with the test sample to determine whether the etch bath can detect thermal damage across at least a threshold percentage of the expected range of thermal damage that may be caused on the manufactured part.

公开(公告)号：US20220349370A1

公开(公告)日：2022-11-03

申请号：US17246146

申请日：2021-04-30

Applicant: Caterpillar Inc.

Inventor： Jonathan Robert Crow ,  Lucy Victoria Berg ,  Douglas Edward Guyer, II ,  Michael Alan Pershing

IPC: F02M61/16 ,  C21D9/00 ,  C21D1/06 ,  C22C38/44 ,  C22C38/00 ,  C22C38/04 ,  C22C38/02 ,  C22C38/46 ,  F02M61/18

Abstract: An example component of a machine includes a core layer and an outer layer encasing the core layer. The outer layer has a greater carbon concentration and hardness than the core layer. The outer layer may also be compressively stressed, while the core layer may have tensile stress. The stress and/or hardness profile of the component may enhance its resistance to cracking, particularly in applications where the component is impacted by other object and/or operates at elevated temperatures. The component, such as parts of a fuel injector, may be formed by rough forming the component, carburizing the component, quenching the component, subzero processing the component, and then performing a tempering process. The components may have relatively sharp transition from the high carbon outer layer to the lower carbon core layer. Additionally, the components have a relatively high tempering resistance when used in relatively high temperature environments.

公开(公告)号：US11885289B2

公开(公告)日：2024-01-30

申请号：US17246146

申请日：2021-04-30

Applicant: Caterpillar Inc.

Inventor： Jonathan Robert Crow ,  Lucy Victoria Berg ,  Douglas Edward Guyer, II ,  Michael Alan Pershing

IPC: F02M61/16 ,  C21D1/06 ,  C21D9/00 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C22C38/46 ,  F02M61/18

CPC classification number: F02M61/166 ,  C21D1/06 ,  C21D9/0068 ,  C22C38/002 ,  C22C38/02 ,  C22C38/04 ,  C22C38/44 ,  C22C38/46 ,  F02M61/18

Abstract: An example component of a machine includes a core layer and an outer layer encasing the core layer. The outer layer has a greater carbon concentration and hardness than the core layer. The outer layer may also be compressively stressed, while the core layer may have tensile stress. The stress and/or hardness profile of the component may enhance its resistance to cracking, particularly in applications where the component is impacted by other object and/or operates at elevated temperatures. The component, such as parts of a fuel injector, may be formed by rough forming the component, carburizing the component, quenching the component, subzero processing the component, and then performing a tempering process. The components may have relatively sharp transition from the high carbon outer layer to the lower carbon core layer. Additionally, the components have a relatively high tempering resistance when used in relatively high temperature environments.