Metal treatment – Process of modifying or maintaining internal physical... – With measuring – testing – or sensing
Patent
1991-09-09
1993-08-24
Wyszomierski, George
Metal treatment
Process of modifying or maintaining internal physical...
With measuring, testing, or sensing
148642, C21D 118
Patent
active
052385094
ABSTRACT:
Remelting/hardening treatment is carried out for a work by a remelting/hardening treatment apparatus including a torch for heating the work. First, the work is firmly placed in position in the remelting/hardening treatment apparatus and a temperature of the work is then measured by a temperature detector. When the measured temperature is lower than a lower limit temperature of a predetermined or particular temperature range, a level of output from the torch is lowered and a part of the work other than a part thereof to be treated is then preheated by the torch. Thereafter, the part of the work to be treated is subjected to remelting and hardening with the aid of the torch. Consequently, production of unacceptable works can be prevented reliably, since remelting/hardening treatment is not carried out at all while the measured temperature is lower than the predetermined or particular temperature range. Alternatively, a preheating operation is performed by the torch while an insufficiently preheated work is placed in position in the remelting/hardening apparatus. After completion of the preheating operation, the work is subjected to remelting and hardening in the same manner as mentioned above.
REFERENCES:
patent: 4312685 (1982-01-01), Riedl
patent: 4890819 (1990-01-01), Grand
"Temperature Controlled Flame Hardening," Metallurgia, Mar. 1952, pp. 135-136.
Mazda Motor Corporation
Wyszomierski George
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