Thermal process for selectively hardening track chain links
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C21D-001/06
출원번호
US-0704202
(1996-08-28)
발명자
/ 주소
Watts Kenneth R.
Biltgen Gary L.
Bowman David E.
Berndt Charles F.
출원인 / 주소
Caterpillar Inc.
대리인 / 주소
Khosla
인용정보
피인용 횟수 :
15인용 특허 :
2
초록▼
A process for selectively hardening a forged track chain link has the following steps. A forged track chain link having a pad portion, a rail portion, a first side portion and a second side portion, is provided. A quench tank is provided and adapted for spraying one or more of the track chain link p
A process for selectively hardening a forged track chain link has the following steps. A forged track chain link having a pad portion, a rail portion, a first side portion and a second side portion, is provided. A quench tank is provided and adapted for spraying one or more of the track chain link portions with a quenchant at a controlled amount of quenchant flow rates, quenchant pressures and quench times. One or more of the track chain link portions are sprayed with the quenchant at a controlled amount of one or more of a plurality of quenchant flow rates, a plurality of quenchant pressures and a plurality of quench times. The pad and rail portions are simultaneously hardened to predetermined respective hardnesses.
대표청구항▼
[ We claim:] [1.] A process for selectively hardening a forged track chain link, comprising the steps of:providing a forged track chain link having a pad portion, a rail portion, a first side portion, and a second side portion;providing a quench tank adapted for receiving said track chain link, said
[ We claim:] [1.] A process for selectively hardening a forged track chain link, comprising the steps of:providing a forged track chain link having a pad portion, a rail portion, a first side portion, and a second side portion;providing a quench tank adapted for receiving said track chain link, said quench tank being adapted for spraying one or more of said track chain link portions with a quenchant at a controlled amount of one or more of a plurality of quenchant flow rates, a plurality of quenchant pressures and a plurality of quench times;positioning said forged track chain link within said quench tank;spraying one or more of said pad portion, said rail portion, said first side portion and said second side portion, with said quenchant at a controlled amount of one or more of a plurality of quenchant flow rates, a plurality of quenchant pressures and a plurality of quench times; wherein said pad portion is sprayed with quenchant at a quenchant flow rate in the range of about 10 g.p.m. to about 50 g.p.m., at a quenchant pressure in the range of about 2 psi to about 5 psi, and at a quench time in the range of about 1 second to about 15 seconds, and said rail portion is sprayed with quenchant at a quenchant flow rate in the range of about 70 gpm to about 100 gpm, at a quenchant pressure in the range of about 5 psi to about 15 psi, and at a quench time in the range of about 90 seconds to about 210 seconds; andsimultaneously hardening said rail portion and said pad portion to respective surface hardnesses, said rail portion being hardened to a surface hardness greater than the surface hardness of said pad portion, said pad portion having a tempered martensitic microstructure up to a depth in the range of about 3 mm to about 12 mm from the surface, and a surface hardness in the range of about R.sub.c 33 to about R.sub.c 41, and said rail portion having a martensitic microstructure up to a depth in the range of about 7 mm to about 25 mm from the surface, and a surface hardness of at least R.sub.c 50.
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이 특허에 인용된 특허 (2)
King Dennis G. (Wrightsville Beach NC) Baran Robert G. (Clifton Park NY) Plemmons Larry W. (Fairfield OH) Sullivan Nancy A. (Williamsburg OH) Culbertson Glenn C. (Mason OH) Srivatsa Shesh K. (Cincinn, Method and apparatus for cooling a workpiece.
Hase, Kazukuni; Kimura, Hideto; Toyooka, Takaaki, Hot forged product with excellent fatigue strength, method for making the same, and machine structural part made from the same.
Steiner, Kevin Lee; Thorson, Timothy Arthur; Diekevers, Mark Steven; Brewer, Caroline Marie; Kaufmann, Gregory J.; Akinlua, Temitope Olayemi, Variable hardening depth in track link for a ground-engaging track.
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