| 摘要 |
PROBLEM TO BE SOLVED: To provide a direct-fire type roller hearth continuous heat-treatment furnace which can provide a desirable material in an adequate treatment period of time, through uniformly heating the article to be heat-treated by improving the uniformity of a temperature distribution in the furnace. SOLUTION: The direct-fire type roller hearth continuous heat-treatment furnace 1 which has spaces inside the furnace partitioned into a plurality of combustion control zones in a transporting direction of the article to be heat-treated and has a thinning-out combustion function as a combustion control function has: burners 4 with relatively low discharging flow rates arranged in combustion control zones in a lower side of a transport roll R among combustion control zones in a prior stage, which heat the article to be heat-treated S almost to a treatment temperature, and combustion control zones in a posterior stage, which keep the temperature of the article to be heat-treated approximately at the treatment temperature; and burners with relatively high discharging flow rates arranged in combustion control zones in the upper side of the transport roll R among the combustion control zones in the posterior stage, which keep the temperature of the article to be heat-treated approximately at the treatment temperature. COPYRIGHT: (C)2009,JPO&INPIT
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