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    AIR-HARDENED MACHINE COMPONENTS
    2.
    发明申请
    AIR-HARDENED MACHINE COMPONENTS 有权

    公开(公告)号：US20220195550A1

    公开(公告)日：2022-06-23

    申请号：US17133251

    申请日：2020-12-23

    Applicant: Caterpillar Inc.

    Inventor： Matthew Thomas Kiser ,  Lindsey S. Cavanaugh ,  Thomas Marshall Congdon ,  Susan Marie Graham ,  Tianjun Liu ,  Mark David Veliz ,  Thomas John Yaniak

    IPC: C21D9/04 ,  C21D8/00 ,  B62D55/205 ,  C21D6/00 ,  C21D1/84 ,  C21D7/13 ,  C22C38/02 ,  C22C38/04

    Abstract: An example track shoe, cutting edge, or other component of a machine is formed in a heated process, such as hot-rolling followed by air-hardening. The air-hardening process involves cooling the component by flowing air over the component (e.g., air cooling), such that the component is cooled at a controlled rate. During the air-cooling process, such as in the range of about 250° C. to about 1100° C., the component may be machined, such as by shearing, punching, drilling, etc. The machining may form the final shape of the component. As the air-hardening process is completed, and the component approaches room temperature, the component may have at least 5% bainitic crystal composition, and as high as greater than 80% bainitic crystal composition, resulting in relatively high hardness and fracture toughness. The final track shoe may have a hardness between about 40 HRC and 55 HRC.

    High carbon steel track bushing
    4.
    发明授权
    High carbon steel track bushing 有权

    公开(公告)号：US11618516B2

    公开(公告)日：2023-04-04

    申请号：US16584158

    申请日：2019-09-26

    Applicant: Caterpillar Inc.

    Inventor： Chandrasen Rameshlal Rathod ,  Roger Lee Recker ,  Robert Jason Pickerill ,  Scott E. Keele ,  Matthew Thomas Kiser

    IPC: B62D55/15 ,  B62D55/21 ,  F16G15/00 ,  C21D9/00

    Abstract: An example bushing has three portions along its radial direction including an inner portion most proximal to a central hole of the bushing, an outer portion most distal from the center hole, and a core portion between the inner portion and the outer portion. The core portion has a hardness that is less than the hardness of the inner portion or the outer portion of the bushing. The bushing may be formed using high carbon steel, which in some cases may be spheroidal cementite crystal structure. A rough bushing may be formed using the high carbon steel, followed by a direct hardening process, and an induction hardening process on the inner surface most proximal to the central hole of the bushing. The induction hardening on the inner surface may harden the outer portion while tempering the core portion of the bushing.

    SURFACE COATINGS FOR DECREASING CLAMP LOAD LOSS
    5.
    发明公开
    SURFACE COATINGS FOR DECREASING CLAMP LOAD LOSS 审中-公开

    公开(公告)号：US20240344542A1

    公开(公告)日：2024-10-17

    申请号：US18134916

    申请日：2023-04-14

    Applicant: Caterpillar Inc.

    Inventor： John William Milem ,  David Allen Akers ,  Matthew Thomas Kiser ,  Ryan Dean Macy ,  Christopher Allen Pollum

    IPC: F16B5/02 ,  F16B2/00

    CPC classification number: F16B5/02 ,  F16B2/005

    Abstract: A machine, such as a hauler at a mining site, includes one or more bolted (clamped) joints. Friction coatings are applied to surfaces of two or more materials being clamped to reduce clamp load loss. The friction coatings include one or more coated surfaces and one or more interstitial spaces between the coated surfaces. Various materials may be used as the friction coating including, but not limited to, a tungsten/carbide or stellite/carbide alloy, iron base alloys such as POLYMET alloys, including PMET 290 (an alloy of iron, chromium, boron, manganese, silicone, and nickel), a nickel chromium alloy, e.g., Ni-20Cr, aluminum oxide (Al2O3) particles, and various combinations of these and other suitable materials.

    HIGH CARBON STEEL TRACK BUSHING
    6.
    发明申请
    HIGH CARBON STEEL TRACK BUSHING 有权

    公开(公告)号：US20210095355A1

    公开(公告)日：2021-04-01

    申请号：US16584158

    申请日：2019-09-26

    Applicant: Caterpillar Inc.

    Inventor： Chandrasen Rameshlal Rathod ,  Roger Lee Recker ,  Robert Jason Pickerill ,  Scott E. Keele ,  Matthew Thomas Kiser

    IPC: C21D9/00 ,  B62D55/21

    Abstract: An example bushing has three portions along its radial direction including an inner portion most proximal to a central hole of the bushing, an outer portion most distal from the center hole, and a core portion between the inner portion and the outer portion. The core portion has a hardness that is less than the hardness of the inner portion or the outer portion of the bushing. The bushing may be formed using high carbon steel, which in some cases may be spheroidal cementite crystal structure. A rough bushing may be formed using the high carbon steel, followed by a direct hardening process, and an induction hardening process on the inner surface most proximal to the central hole of the bushing. The induction hardening on the inner surface may harden the outer portion while tempering the core portion of the bushing.

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