ROLLER HEARTH TYPE HEAT TREATMENT FURNACE AND HEAT TREATMENT METHOD USING THE SAME

• Main Authors: KAWATE KENJI, SHIMAMURA MITSUHIRO, ANDO HIDEAKI
• Format: Patent
• Language: English; Japanese
• Published: 21.06.2018
• Subjects: BLASTING; CHEMISTRY; DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS,IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KINDOF FURNACE; FURNACES; FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; HEATING; KILNS; LIGHTING; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; MECHANICAL ENGINEERING; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; OPEN SINTERING OR LIKE APPARATUS; OVENS; RETORTS; WEAPONS

PROBLEM TO BE SOLVED: To provide a roller hearth type heat treatment furnace capable of performing heat treatment to a prescribed hardness without deteriorating a working environment and further without reducing the heat treatment capacity of the whole according to various steel kinds, and a heat treatment method using the same.SOLUTION: Provided is a roller hearth type heat treatment furnace comprising: a heating chamber; a heating/slow cooling chamber; a rapid cooling chamber; hearth rollers driving independently in each chamber; opening/closing doors mounted at the inlet of the heating chamber, the outlet of the heating/slow cooling chamber and the inlet and outlet of the rapid cooling chamber; direct fire burners mounted at the heating chamber and the heating/slow cooling chamber; supply air ducts and supply air fans connected to the heating/slow cooling chamber and the rapid cooling chamber; and exhaust ducts and dampers connected to the inlet side of the heating chamber, the outlet side of the heating/slow cooling chamber and the rapid cooling chamber, in which a workpiece placed on a tray is, while being carried, heated to a prescribed temperature in the heating chamber and the heating/slow cooling chamber based on the CCT curve of the workpiece, and is successively cooled to a prescribed temperature at a prescribed cooling rate in the heating/slow cooling chamber or the rapid cooling chamber so as to be a prescribed hardness.SELECTED DRAWING: Figure 1 【課題】様々な鋼種に適応して、作業環境を悪化させず、また全体の熱処理能力を低下させることなく、所定の硬度に熱処理することができるローラハース式熱処理炉及びこれを用いる熱処理方法の提供。【解決手段】ローラハース式熱処理炉として、加熱室、加熱兼徐冷室、急冷室と、各室で独立して駆動するハースローラと、加熱室の入口、加熱兼徐冷室の出口、急冷室の入口及び出口に装備された開閉扉と、加熱室及び加熱兼徐冷室に装備された直火バーナと、加熱兼徐冷室及び急冷室に接続された給気ダクト、給気ファンと、加熱室入口側、加熱兼徐冷室出口側及び急冷室に接続された排気ダクト、ダンパとを備え、トレーに載置したワークを、搬送しながら、ワークのＣＣＴ曲線に基づき、加熱室と加熱兼徐冷室にて所定の温度に加熱し、引き続き加熱兼徐冷室又は急冷室にて所定の冷却速度で所定の温度に冷却して、所定の硬度のものにするローラーハース式熱処理炉。【選択図】図１