Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1998-06-16
2000-04-11
Yee, Deborah
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148647, 266117, C21D 800
Patent
active
060484187
ABSTRACT:
An improved method for heat treating and forming Belleville washers, springs, clutch plates and the like by initially stamping or otherwise forming a flat ring, heating the ring to an elevated temperature of approximately 1700.degree. F., placing the hot ring within a die at least partially submerged in a molten salt bath and forming the ring into its final, generally frustoconical or tapered configuration while submerged in the molten salt bath. The heated formed ring is maintained in the closed die for approximately 30 seconds and is thereafter released from the die and maintained within the molten salt bath, which is maintained at a temperature of approximately 600.degree. F., for approximately one-half hour to further heat treat or austemper it to achieve the desired metallurgical properties of the steel part. By forming the hot ring within the forming dies immersed in the molten salt bath, the deformation caused by forming and the initial rapid cooling of the heated part in the cooler salt bath is minimized, if not eliminated completely. After a short duration of approximately 20 to 30 seconds, the part is sufficiently cooled so that it may be released from the die and maintained in the molten salt bath without significant deformation upon further heat treating and subsequent cooling. Maintaining the formed part within the molten salt bath for approximately one-half hour further heat treats the steel to provide the desired metallurgical properties of the finished part. Specifically, a significant amount of bainite is formed which provides a high hardness, ductility and impact resistance and permits significant flexing of the part without failure.
REFERENCES:
patent: 1457772 (1923-06-01), Forsyth
patent: 3506501 (1970-04-01), Hays et al.
Sterling Detroit Company
Yee Deborah
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