JP2007093161A - Continuous heat treatment furnace - Google Patents

Continuous heat treatment furnace Download PDF

Info

Publication number
JP2007093161A
JP2007093161A JP2005286133A JP2005286133A JP2007093161A JP 2007093161 A JP2007093161 A JP 2007093161A JP 2005286133 A JP2005286133 A JP 2005286133A JP 2005286133 A JP2005286133 A JP 2005286133A JP 2007093161 A JP2007093161 A JP 2007093161A
Authority
JP
Japan
Prior art keywords
furnace
heat treatment
heat
furnace body
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2005286133A
Other languages
Japanese (ja)
Other versions
JP4982763B2 (en
Inventor
Hiroyoshi Suzuki
広良 鈴木
Fumitaka Abukawa
文隆 虻川
Kenichi Kitamoto
健一 北本
Wataru Takeuchi
亘 竹内
Atsushi Takahashi
淳 高橋
Kazuyoshi Fujita
一良 藤田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dowa Holdings Co Ltd
Original Assignee
Dowa Holdings Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dowa Holdings Co Ltd filed Critical Dowa Holdings Co Ltd
Priority to JP2005286133A priority Critical patent/JP4982763B2/en
Publication of JP2007093161A publication Critical patent/JP2007093161A/en
Application granted granted Critical
Publication of JP4982763B2 publication Critical patent/JP4982763B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous heat treatment furnace for easily stabilizing an atmosphere and requiring a shorter time for seasoning, although a conventional continuous heat treatment furnace has a defect of requiring much time for seasoning because of the use of bricks for a furnace body. <P>SOLUTION: The continuous heat treatment furnace for heating treated objects to be treated comprises a plurality of heat treatment chamber 2. A ceiling portion, a floor portion and side walls of the furnace body in each heat treatment chamber are each formed with a furnace shell layer 31, a heat insulating layer 32 provided inside the furnace shell layer 31, and a ceramic fiber layer 33 provided inside the heat insulating layer 32. A plurality of rollers are provided in the furnace body for the treated objects to be placed thereon. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、鋼材の浸炭処理や窒化処理などに用いられる連続熱処理炉に関する。   The present invention relates to a continuous heat treatment furnace used for carburizing or nitriding steel.

従来、鋼材の熱処理に使用される熱処理炉の炉体は、耐火性を有するレンガ層を備え、レンガ層の外側に断熱材が設けられた構成となっている（例えば、特許文献１参照）。
特開平９−７９７６１号公報 2. Description of the Related Art Conventionally, a furnace body of a heat treatment furnace used for heat treatment of a steel material has a structure in which a brick layer having fire resistance is provided and a heat insulating material is provided outside the brick layer (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 9-79761

しかしながら、このような従来の熱処理炉にあっては、炉体にレンガを用いているため炉壁が厚くなり、炉内の容積を広くできない問題があった。また、シーズニング時にはレンガに吸着されていた酸素が高温により炉内に放出されるため、炉内雰囲気を安定させるまでに時間がかかり、シーズニング時間を短縮することが難しい問題があった。   However, in such a conventional heat treatment furnace, since bricks are used for the furnace body, there is a problem that the furnace wall becomes thick and the volume in the furnace cannot be increased. Further, since oxygen adsorbed on the brick during seasoning is released into the furnace due to high temperature, it takes time to stabilize the atmosphere in the furnace, and it is difficult to shorten the seasoning time.

また、優れた断熱性を持つ材料を用いれば熱効率の良い炉を製造できるが断熱性の良い材料を使用したものの、必ずしも熱効率の良い炉にならなかった。   Moreover, if a material having excellent heat insulation properties is used, a furnace with good heat efficiency can be manufactured. However, although a material with good heat insulation properties is used, it has not always become a furnace with good heat efficiency.

本発明の目的は前記の欠点を除くようにしたものである。   The object of the present invention is to eliminate the aforementioned drawbacks.

前記課題を解決するため、本発明の連続熱処理炉は、被処理体を加熱して処理する連続熱処理炉であって、複数の熱処理室を有し、各熱処理室の炉体の天井部、床部及び側壁が、炉殻層と、前記炉殻層の内側に設けた断熱層と、前記断熱層の内側に設けたセラミックファイバー層とによって構成され、前記炉体内に、被処理体を載せる複数本のローラを設けたことを特徴とする。   In order to solve the above-mentioned problems, a continuous heat treatment furnace of the present invention is a continuous heat treatment furnace for heating and treating an object to be processed, and has a plurality of heat treatment chambers. The portion and the side wall are configured by a furnace shell layer, a heat insulating layer provided inside the furnace shell layer, and a ceramic fiber layer provided inside the heat insulating layer, and a plurality of objects to be processed are placed in the furnace body. A book roller is provided.

また、前記各熱処理室を区画するシャッターを有し、前記シャッターが、断熱層と、この断熱層の両側に設けたセラミックファイバー層とによって構成されていることを特徴とする。   Moreover, it has a shutter which divides each said heat processing chamber, The said shutter is comprised by the heat insulation layer and the ceramic fiber layer provided in the both sides of this heat insulation layer, It is characterized by the above-mentioned.

また、前記連続熱処理炉は、ガスバーナを用いた加熱器を備えたことを特徴とする。   In addition, the continuous heat treatment furnace includes a heater using a gas burner.

本発明によれば、炉体を金属製の炉殻層と、断熱層と、セラミックファイバー層とによって構成したことにより、レンガを用いた場合と比較して、炉体の厚さを薄くすることができ、従って、炉体の容積を広くすることができる。炉体を大型化することなく、ガスバーナを用いた加熱器を備えることができる。さらに、シーズニングの際、炉体にレンガを用いた場合よりも雰囲気を安定させ易くなり、シーズニングに要する時間を短縮することができる。また、ガスバーナを用いたことにより、電気ヒータより昇温や降温の効率を向上させることができる。   According to the present invention, the furnace body is composed of a metal furnace shell layer, a heat insulating layer, and a ceramic fiber layer, thereby reducing the thickness of the furnace body as compared with the case of using bricks. Therefore, the volume of the furnace body can be increased. A heater using a gas burner can be provided without increasing the size of the furnace body. Furthermore, it becomes easier to stabilize the atmosphere during seasoning than when bricks are used for the furnace body, and the time required for seasoning can be shortened. Further, the use of the gas burner can improve the efficiency of temperature increase and decrease than the electric heater.

また、適切な熱伝導率及び厚さの断熱層およびセラミックファイバー層とすることで、断熱性に優れ蓄熱の少ない部材の特性を生かし、従来と比較して熱効率の優れた炉とすることができる。また、断熱層とセラミックファイバー層を薄くできたため、従来より６０〜２１０ｍｍほど長さを短くすることができ、これによりローラーハース上にワーク（トレイ）が載った場合でも、ローラーハースを支えるスパンが従来より短いため、耐荷重も向上する。   In addition, by using a heat insulating layer and a ceramic fiber layer having an appropriate thermal conductivity and thickness, it is possible to make a furnace having excellent heat efficiency and thermal efficiency as compared with conventional ones by taking advantage of the characteristics of a member having excellent heat insulation and low heat storage. . In addition, since the heat insulating layer and the ceramic fiber layer can be made thinner, the length can be shortened by about 60 to 210 mm compared to the conventional one, and even when a work (tray) is placed on the roller hearth, the span that supports the roller hearth can be reduced. Since it is shorter than before, the load resistance is also improved.

また、耐荷重の向上が不要な場合、スパンが従来より短くなったため、同じ耐荷重の設計をする場合、ローラーハースの直径を小さくすることができる。さらにはローラーハースの間隔も広げることができ、ローラーハースのコストを削減することができる。   Moreover, when the improvement of the load resistance is not required, the span is shorter than the conventional one. Therefore, when designing the same load resistance, the diameter of the roller hearth can be reduced. Furthermore, the interval between the roller hearths can be increased, and the cost of the roller hearths can be reduced.

以下、本発明の好ましい実施の形態を図面を参照にして説明する。   Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

図１に示すように、鋼材である被処理体Ｗの熱処理を行う連続熱処理炉１は、複数に区画された熱処理室２と、油槽室３とを備えている。   As shown in FIG. 1, a continuous heat treatment furnace 1 that performs heat treatment of a workpiece W that is a steel material includes a plurality of heat treatment chambers 2 and an oil tank chamber 3.

上流側の熱処理室２を構成する炉体５の前側壁５ａには、被処理体Ｗを搬入させるための搬入口１０と、搬入口１０を開閉するシャッター１１が設けられている。搬入口１０の前方には、被処理体Ｗを載置するテーブル１２が設けられている。炉体５の後側壁５ｂには、被処理体Ｗを搬出させるための搬出口１５と、搬出口１５を開閉する中間シャッター１６が設けられている。下流側の熱処理室２の炉体５と油槽室３は、搬出口１５及びシャッター１１を介して連通するようになっている。各熱処理室２は例えば加熱ゾーン６Ａ、降温ゾーン６Ｂ、均熱ゾーン６Ｃとして用いられ、各ゾーン６Ａ、６Ｂ、６Ｃ内には、夫々被処理体Ｗを載せるローラハース２０と、炉体５の各ゾーン内の雰囲気を攪拌するファン２１と、雰囲気を加熱する加熱器２２とが設けられている。また、図示はしないが、炉体５内に浸炭ガスや窒素ガスなどを供給する供給装置と、炉体５内から排気を行う排気装置が設けられている。   On the front side wall 5a of the furnace body 5 constituting the upstream heat treatment chamber 2, a carry-in port 10 for carrying the workpiece W and a shutter 11 for opening and closing the carry-in port 10 are provided. A table 12 on which the workpiece W is placed is provided in front of the carry-in entrance 10. On the rear side wall 5b of the furnace body 5, a carry-out port 15 for carrying out the workpiece W and an intermediate shutter 16 for opening and closing the carry-out port 15 are provided. The furnace body 5 and the oil tank chamber 3 of the heat treatment chamber 2 on the downstream side are communicated with each other via the carry-out port 15 and the shutter 11. Each heat treatment chamber 2 is used as, for example, a heating zone 6A, a temperature lowering zone 6B, and a soaking zone 6C. In each zone 6A, 6B, 6C, a roller hearth 20 on which the workpiece W is placed and each zone of the furnace body 5 are provided. A fan 21 that stirs the atmosphere inside and a heater 22 that heats the atmosphere are provided. Although not shown, a supply device that supplies carburizing gas, nitrogen gas, and the like into the furnace body 5 and an exhaust device that exhausts air from the furnace body 5 are provided.

図２及び図３に示すように、各熱処理室２の炉体５は、例えば鋼板などの金属製の炉殻層３１と、炉殻層３１の内側に積層された断熱層３２と、断熱層３２の内側に積層された耐火性を有するセラミックファイバー層３３とによって構成された３層構造になっている。断熱層３２としては、シリカ系の材質、例えばマイクロサーム（日本マイクロサーム株式会社製）などを用いると良い。セラミックファイバー層３３としては、例えばＡｌ2Ｏ3又はＳｉ2Ｏ3などのセラミック材をフェルト状にしたものを用いると良い。このように、断熱層３２の内側に耐火層としてセラミックファイバー層３３を備えた構造にすると、断熱層３２の内側に耐火層としてレンガを備えた構造と比較して、炉体５の厚さを薄くすることができる。従って、炉体５内の容積を広くすることができる。また、断熱層３２の内側にセラミックファイバー層３３を設けることにより、断熱層３２が劣化することを防止できる。さらに、炉体５の前側壁５ａ、後側壁５ｂ、左側壁５ｃ、右側壁５ｄ、天井部ｅ及び床部５ｆを総て断熱層３２とセラミックファイバー層３３とを備えた構造とすることにより、前側壁５ａ、後側壁５ｂ、左側壁５ｃ、右側壁５ｄ、天井部５ｅ及び床部５ｆにおいて均等に蓄熱され、また、炉外に放散される熱も均等になるので、炉体５内の温度分布の均一性を良好にすることができる。さらに、シーズニングの際、炉体５にレンガを用いた場合よりも炉体５内の雰囲気を安定させ易くなり、シーズニングに要する時間を短縮することができる。また、炉体５にレンガを用いた場合、レンガに微量の鉄分が含有されていることにより、浸炭処理等に炉体５内に供給されたＣＯが作用して、レンガ中にカーボンが蓄積されたり、スーティング現象が生じたりする問題があるが、セラミックファイバーには鉄分が殆ど含まれていないので、カーボンの蓄積やスーティングを抑制させることができる。 As shown in FIGS. 2 and 3, the furnace body 5 of each heat treatment chamber 2 includes a metal furnace shell layer 31 such as a steel plate, a heat insulating layer 32 laminated inside the furnace shell layer 31, and a heat insulating layer. It has a three-layer structure constituted by a ceramic fiber layer 33 having fire resistance laminated inside 32. As the heat insulating layer 32, a silica-based material such as microtherm (manufactured by Nippon Microtherm Co., Ltd.) or the like may be used. As the ceramic fiber layer 33, for example, a ceramic material such as Al 2 O 3 or Si 2 O 3 in a felt shape may be used. Thus, when it is set as the structure provided with the ceramic fiber layer 33 as a refractory layer inside the heat insulation layer 32, compared with the structure provided with the brick as a refractory layer inside the heat insulation layer 32, the thickness of the furnace body 5 is made. Can be thinned. Therefore, the volume in the furnace body 5 can be increased. Further, by providing the ceramic fiber layer 33 inside the heat insulating layer 32, it is possible to prevent the heat insulating layer 32 from deteriorating. Furthermore, by making the front side wall 5a, the rear side wall 5b, the left side wall 5c, the right side wall 5d, the ceiling part e and the floor part 5f of the furnace body 5 into a structure including the heat insulating layer 32 and the ceramic fiber layer 33, Since the heat is uniformly stored in the front side wall 5a, the rear side wall 5b, the left side wall 5c, the right side wall 5d, the ceiling part 5e and the floor part 5f, and the heat dissipated outside the furnace is also equalized, the temperature inside the furnace body 5 The uniformity of distribution can be improved. Furthermore, at the time of seasoning, it becomes easier to stabilize the atmosphere in the furnace body 5 than when bricks are used for the furnace body 5, and the time required for seasoning can be shortened. In addition, when brick is used for the furnace body 5, since a small amount of iron is contained in the brick, CO supplied in the furnace body 5 acts on the carburizing process and the like, and carbon is accumulated in the brick. There is a problem that a sooting phenomenon occurs, but since the ceramic fiber contains almost no iron, the accumulation and sooting of carbon can be suppressed.

シャッター１１も、炉体５と同様に、炉殻層３１と、炉殻層３１の内側に積層された断熱層３２と、断熱層３２の内側に積層されたセラミックファイバー層３３とによって構成された３層構造になっているのが好ましい。シャッター１１において搬入口１０及び搬出口１５に面する側の周縁部、即ち、セラミックファイバー層３３の周縁部には、例えば鋼板などの金属製のシール４１が設けられている。一方、前側壁５ａ及び後側壁５ｂにおいて、搬入口１０及び搬出口１５の外側の周縁部、即ち炉殻層３１の外面には、例えば鋼板などの金属製のシール４２が設けられている。また、シール４２に沿って、グラファイトパッキン４３が設けられている。これらシール４１，４２がグラファイトパッキン４３を挟んで互いに密着することにより、搬入口１０が確実に閉塞されるようになっている。また、シール４１によってシャッター１１のセラミックファイバー層３３の周縁部が保護され、セラミックファイバー層３３が損傷することを防止している。   Similarly to the furnace body 5, the shutter 11 is also composed of a furnace shell layer 31, a heat insulating layer 32 laminated inside the furnace shell layer 31, and a ceramic fiber layer 33 laminated inside the heat insulating layer 32. A three-layer structure is preferred. A metal seal 41 such as a steel plate is provided on the peripheral portion of the shutter 11 facing the carry-in port 10 and the carry-out port 15, that is, the peripheral portion of the ceramic fiber layer 33. On the other hand, in the front side wall 5a and the rear side wall 5b, a metal seal 42 such as a steel plate is provided on the outer peripheral edge of the carry-in port 10 and the carry-out port 15, that is, on the outer surface of the furnace shell layer 31. A graphite packing 43 is provided along the seal 42. By bringing these seals 41 and 42 into close contact with each other with the graphite packing 43 interposed therebetween, the carry-in entrance 10 is reliably closed. Further, the peripheral portion of the ceramic fiber layer 33 of the shutter 11 is protected by the seal 41, and the ceramic fiber layer 33 is prevented from being damaged.

中間シャッター１６は、断熱層３２と、この断熱層３２を挟んで両側に積層されたセラミックファイバー層３３ととにより構成される。   The intermediate shutter 16 includes a heat insulating layer 32 and ceramic fiber layers 33 laminated on both sides with the heat insulating layer 32 interposed therebetween.

また、図２に示すように、ローラハース２０の各ローラは左側壁５ｃ、右側壁５ｄにより支えら、所望の間隔を開けて前後方向に並べられている。   Further, as shown in FIG. 2, the rollers of the roller hearth 20 are supported by the left side wall 5c and the right side wall 5d, and are arranged in the front-rear direction at a desired interval.

図１〜図３に示すように、加熱器２２は、略Ｕ字形状のラジアントチューブ５７と、ラジアントチューブ５７の端部に設けられたガスバーナ５８とによって構成されている。即ちガスバーナ５８から燃焼ガスを噴射させ、ラジアントチューブ５７内に燃焼ガスが供給されることにより、炉体５内が加熱されるようになっている。さらに、ガスバーナ５８内には蓄熱体が備えられており、ラジアントチューブ５７の一端側から燃焼ガスを噴射させる際、他端側では蓄熱が行われる。この燃焼ガスの噴射と蓄熱を、ラジアントチューブ５７の一端側と他端側とで交互に切り換えて行い、蓄熱を利用して熱効率を向上させることができるようになっている。また、ラジアントチューブ５７内に冷風を供給することにより、ラジアントチューブ５７を迅速に冷却させ、炉体５内を降温させることができる。これにより、電気ヒータよりも降温を迅速に行うことができる。   As shown in FIGS. 1 to 3, the heater 22 includes a substantially U-shaped radiant tube 57 and a gas burner 58 provided at the end of the radiant tube 57. In other words, the combustion gas is injected from the gas burner 58 and the combustion gas is supplied into the radiant tube 57 so that the interior of the furnace body 5 is heated. Further, a heat storage body is provided in the gas burner 58, and when the combustion gas is injected from one end side of the radiant tube 57, heat storage is performed on the other end side. The combustion gas injection and the heat storage are alternately switched between the one end side and the other end side of the radiant tube 57, and the heat efficiency can be improved by using the heat storage. Further, by supplying cold air into the radiant tube 57, the radiant tube 57 can be quickly cooled and the temperature inside the furnace body 5 can be lowered. Thereby, temperature fall can be performed more rapidly than an electric heater.

図１に示すように、油槽室３には、被処理体Ｗを載置させる載置台６１と、油槽６２とが備えられている。また、被処理体Ｗを油槽室３内から搬出するための搬出口６３が形成されており、搬出口６３を開閉するシャッター６４が設けられている。搬出口６３の後方には、被処理体Ｗを載置するテーブル６５が設けられている。   As shown in FIG. 1, the oil tank chamber 3 includes a mounting table 61 on which the object to be processed W is mounted and an oil tank 62. Further, a carry-out port 63 for carrying out the workpiece W from the oil tank chamber 3 is formed, and a shutter 64 for opening and closing the carry-out port 63 is provided. A table 65 on which the workpiece W is placed is provided behind the carry-out port 63.

次に、以上のように構成された連続熱処理炉１を用いた被処理体Ｗの処理について説明する。先ず、連続熱処理炉１の操業開始時には、ガスバーナ５８を用いた加熱器２２の加熱により、熱処理室２の炉体５内の昇温とシーズニングを行う。炉体５は断熱層３２によって高い断熱性を有するので、昇温を効率的に行うことができる。また、炉体５全体が断熱層３２とセラミックファイバー層３３とを備えた構造になっているので、炉体５内の温度分布を均一にすることができる。また、セラミックファイバー層３３から炉体５内に放出される酸素や水蒸気の量が少ないので、炉体５内の雰囲気を迅速に安定させることができる。従って、昇温とシーズニングに要する時間を短縮することができる。さらに、ガスバーナ５８を用いた加熱器２２を使用することにより、電気ヒータを用いて加熱する場合と比較して効率的に加熱することができるので、昇温とシーズニングに要する時間を大幅に短縮することができ、また、加熱に要するコストを削減できる。   Next, the process of the to-be-processed object W using the continuous heat processing furnace 1 comprised as mentioned above is demonstrated. First, at the start of operation of the continuous heat treatment furnace 1, the temperature in the furnace body 5 of the heat treatment chamber 2 is increased and seasoned by heating the heater 22 using the gas burner 58. Since the furnace body 5 has high heat insulating properties due to the heat insulating layer 32, the temperature rise can be efficiently performed. Further, since the entire furnace body 5 has a structure including the heat insulating layer 32 and the ceramic fiber layer 33, the temperature distribution in the furnace body 5 can be made uniform. Further, since the amount of oxygen and water vapor released from the ceramic fiber layer 33 into the furnace body 5 is small, the atmosphere in the furnace body 5 can be quickly stabilized. Therefore, the time required for temperature rise and seasoning can be shortened. Furthermore, by using the heater 22 using the gas burner 58, it is possible to efficiently heat compared with the case where heating is performed using an electric heater, so that the time required for temperature rise and seasoning is greatly shortened. Moreover, the cost required for heating can be reduced.

炉体４内の昇温とシーズニングを行った後、被処理体Ｗをテーブル１２に載置し、被処理体Ｗを上流側の熱処理室２の搬入口１０を開口させ、被処理体Ｗを図示しないプッシャーによって前方から後方に押して、搬入口１０を通過させて炉体５内のローラハース２０上に被処理体Ｗを移動させ、プッシャーを炉体５から退避させ、シャッター１１によって搬入口１０を閉じる。   After the temperature rise and seasoning in the furnace body 4 are performed, the object to be processed W is placed on the table 12, the inlet W of the heat treatment chamber 2 on the upstream side is opened, and the object W to be processed is The pusher (not shown) is pushed from the front to the rear, passes through the carry-in entrance 10, moves the workpiece W onto the roller hearth 20 in the furnace body 5, retracts the pusher from the furnace body 5, and moves the carry-in entrance 10 with the shutter 11. close.

被処理体Ｗを熱処理室２に搬入させたら、炉体５内を約９５０℃程度に昇温させる。被処理体Ｗが十分に予備加熱された後、炉体５内に浸炭ガスを供給して、浸炭処理を行う。続いて拡散処理を行った後、上流側の炉体５の搬出口１５を開口し、ローラハース２０を駆動して、被処理体Ｗを上流側から下流側の熱処理室２に移動させ、搬出口１５を通過させ、炉体５の降温ゾーン６Ｂに移動させ、中間シャッター１６によって搬出口１５を閉じ、降温ゾーン６Ｂ内で被処理体Ｗを降温させながら降温処理を行う。そして、下流側の炉体５の搬入口１０を開口させ、ローラハース２０を駆動して、被処理体Ｗを上流側から下流側に移動させ、搬入口１０を通過させ炉体５の均熱ゾーン６Ｃに移動させ、中間シャッター１６によって搬入口１０を閉じ、均熱ゾーン６Ｃ内を約８５０℃程度にして、均熱処理を行う。このように浸炭、拡散、降温、均熱などの熱処理を行う間も、炉体５全体が断熱層３２とセラミックファイバー層３３とを備えた構造になっているため、炉体５内の雰囲気の温度分布を良好に維持することができる。従って、処理むらを防止できる。また、ガスバーナ５８を用いた加熱器２２により、電気ヒータを用いて加熱する場合よりも温度を良好に調節することができる。従って、熱処理室２における熱処理の時間を短縮することができる。   When the workpiece W is carried into the heat treatment chamber 2, the temperature inside the furnace body 5 is raised to about 950 ° C. After the workpiece W is sufficiently preheated, carburizing gas is supplied into the furnace body 5 to perform carburizing treatment. Subsequently, after performing the diffusion treatment, the carry-out port 15 of the upstream furnace body 5 is opened, the roller hearth 20 is driven, and the workpiece W is moved from the upstream side to the downstream heat treatment chamber 2 to carry out the carry-out port. 15 is moved to the temperature lowering zone 6B of the furnace body 5, the carry-out port 15 is closed by the intermediate shutter 16, and the temperature lowering process is performed while lowering the temperature of the workpiece W in the temperature lowering zone 6B. Then, the carry-in port 10 of the downstream furnace body 5 is opened, the roller hearth 20 is driven, the workpiece W is moved from the upstream side to the downstream side, and the carry-in port 10 is passed through so that the soaking zone of the furnace body 5 is reached. 6C, the entrance 10 is closed by the intermediate shutter 16, the inside of the soaking zone 6C is set to about 850 ° C., and soaking is performed. Since the entire furnace body 5 has a structure including the heat insulating layer 32 and the ceramic fiber layer 33 even during the heat treatment such as carburizing, diffusion, temperature lowering, and soaking, the atmosphere in the furnace body 5 is reduced. Good temperature distribution can be maintained. Therefore, processing unevenness can be prevented. Further, the heater 22 using the gas burner 58 can adjust the temperature better than the case of heating using an electric heater. Therefore, the heat treatment time in the heat treatment chamber 2 can be shortened.

熱処理室２の均熱ゾーン６Ｃにおいて均熱処理が終了した後、下流側の炉体５の搬出口１５を開いて、ローラハース２０を駆動して被処理体Ｗを更に下流側に移動させ、搬出口１５を通過させて炉体５内から油槽室３に被処理体Ｗを移動させる。そして、被処理体Ｗを載せた載置台６１を下降させ、被処理体Ｗを油槽６２に浸漬させて油焼入れを行う。その後、被処理体Ｗを油槽６２から引き上げ、搬出口６３を開いて被処理体Ｗを油槽室３から搬出してテーブル６５に移動させる。このようにして、連続熱処理炉１における一連の処理が終了する。   After soaking in the soaking zone 6C of the heat treatment chamber 2, the carry-out port 15 of the downstream furnace body 5 is opened, the roller hearth 20 is driven to move the workpiece W further downstream, and the carry-out port 15, the workpiece W is moved from the furnace body 5 to the oil tank chamber 3. And the mounting base 61 which mounted the to-be-processed object W is dropped, the to-be-processed object W is immersed in the oil tank 62, and oil quenching is performed. Thereafter, the object to be processed W is pulled up from the oil tank 62, the carry-out port 63 is opened, the object to be processed W is unloaded from the oil tank chamber 3 and moved to the table 65. In this way, a series of processes in the continuous heat treatment furnace 1 is completed.

連続熱処理炉１の操業終了時には、熱処理室２において、加熱器２２の加熱を停止させ、炉体５内の温度を降温させる。炉体５は、レンガより蓄熱量が少ないセラミックファイバー層３３を用いた構造になっており、また、ガスバーナ５８を用いた加熱器２２によって迅速に冷却することができるので、炉体５内を迅速に降温させることができる。   At the end of the operation of the continuous heat treatment furnace 1, the heating of the heater 22 is stopped in the heat treatment chamber 2, and the temperature in the furnace body 5 is lowered. The furnace body 5 has a structure using the ceramic fiber layer 33 that has a smaller heat storage amount than bricks, and can be quickly cooled by the heater 22 using the gas burner 58. The temperature can be lowered.

かかる連続熱処理炉１によれば、炉体５にレンガを用いず、炉体５を金属製の炉殻層３１と、炉殻層３１の内側に設けた断熱層３２と、断熱層３２の内側に設けたセラミックファイバー層３３とによって構成したことにより、レンガを用いた場合と比較して、炉体５の前側壁５ａ、後側壁５ｂ、左側壁５ｃ、右側壁５ｄ、天井部５ｅ及び床部５ｆの厚さを薄くすることができる。従って、炉体５内の容積を広くすることができる。そのため、炉体５を大型化することなく、ガスバーナ５８を用いた加熱器２２を配設することができる。また、炉体５内に搬入可能な被処理体Ｗの容積を増加させることができ、処理能力を向上させることができる。   According to the continuous heat treatment furnace 1, the brick 5 is not used for the furnace body 5, the furnace body 5 is made of a metal furnace shell layer 31, the heat insulation layer 32 provided inside the furnace shell layer 31, and the inside of the heat insulation layer 32. Compared with the case where brick is used, the front side wall 5a, the rear side wall 5b, the left side wall 5c, the right side wall 5d, the ceiling part 5e, and the floor part of the furnace body 5 are configured by the ceramic fiber layer 33 provided on the floor. The thickness of 5f can be reduced. Therefore, the volume in the furnace body 5 can be increased. Therefore, the heater 22 using the gas burner 58 can be disposed without increasing the size of the furnace body 5. Moreover, the volume of the to-be-processed object W which can be carried in in the furnace body 5 can be increased, and processing capacity can be improved.

さらに、ガスバーナ５８を用いた加熱器２２を使用することにより、電気ヒータを用いて加熱する場合と比較して、昇温や降温を迅速に行うことができる。従って、熱処理室２における熱処理の時間を大幅に短縮することができる。また、電気ヒータを用いて加熱する場合と比較して、効率的に加熱することができ、加熱に要するコストを削減できる。   Furthermore, by using the heater 22 using the gas burner 58, the temperature can be raised or lowered more quickly than in the case of heating using an electric heater. Therefore, the heat treatment time in the heat treatment chamber 2 can be greatly shortened. Moreover, compared with the case where it heats using an electric heater, it can heat efficiently and can reduce the cost which heating requires.

本発明の連続熱処理炉においては、例えば断熱層３２の断熱材（セラミックブロック）としては、厚さを７５〜１５０ｍｍ、好ましくは８０〜１２０ｍｍ、熱伝導率を０．０１〜０．０３ｋｃａｌ／ｍ・ｈ・℃、好ましくは０．０２ｋｃａｌ／ｍ・ｈ・℃程度とする。   In the continuous heat treatment furnace of the present invention, for example, as the heat insulating material (ceramic block) of the heat insulating layer 32, the thickness is 75 to 150 mm, preferably 80 to 120 mm, and the thermal conductivity is 0.01 to 0.03 kcal / m ·. h · ° C., preferably about 0.02 kcal / m · h · ° C.

また、セラミックファイバー層３３としては、厚さを５０〜１００ｍｍ、好ましくは１００ｍｍ、熱伝導率を０．０４〜０．０８ｋｃａｌ／ｍ・ｈ・℃、好ましくは０．０６ｋｃａｌ／ｍ・ｈ・℃程度とする。前記セラミックブロック（断熱材）の厚さ及び前記セラミックファイバーの厚さは断熱性を上げるために単に厚くすれば良いのではない。断熱材の組み合わせ、厚さにより、断熱性と炉の表面からの放散熱の量、すなわちこれらのバランスが適切であることが必要である。本発明により前記断熱材と特性、厚さ、前記セラミックファイバーの特性、厚さについて、ローラーハースを持つ熱処理炉について好適なものを提供できるようになった。   The ceramic fiber layer 33 has a thickness of 50 to 100 mm, preferably 100 mm, and a thermal conductivity of 0.04 to 0.08 kcal / m · h · ° C., preferably about 0.06 kcal / m · h · ° C. And The thickness of the ceramic block (heat insulating material) and the thickness of the ceramic fiber are not simply increased in order to increase the heat insulating property. Depending on the combination and thickness of the heat insulating material, it is necessary that the heat insulating property and the amount of heat dissipated from the surface of the furnace, that is, the balance between them be appropriate. According to the present invention, it is possible to provide a heat treatment furnace having a roller hearth with respect to the heat insulating material, characteristics, thickness, and characteristics and thickness of the ceramic fiber.

また、ローラーは炉殻外の支持部（図示しない）によりにより両端部が支持されている。ローラー２０の好ましい材質は耐熱鋼である。   Further, both ends of the roller are supported by support portions (not shown) outside the furnace shell. A preferred material for the roller 20 is heat resistant steel.

このような連続熱処理炉の一例では入熱が約１００，０００ｋｃａｌ／ｈに対して処理品加熱は約４６．８％、炉表面からの放散熱は約３５．７％、その他の部分からの放散熱は約１７．５％、炉表面壁温度は８３℃／ｍ2、放散熱量は７０８ｋｃａｌ／ｈ・ｍ2となる。 In an example of such a continuous heat treatment furnace, the heat input is about 100,000 kcal / h, the treatment product heating is about 46.8%, the heat dissipated from the furnace surface is about 35.7%, and the heat from other parts is released. The heat dissipation is about 17.5%, the furnace surface wall temperature is 83 ° C./m 2 , and the heat dissipation is 708 kcal / h · m 2 .

また、本発明の連続熱処理炉では、断熱層とセラミックファイバー層を、側壁と天井及び床について同じ厚さにする。また、ファンによる強制撹拌を行なうのが好ましい。   Moreover, in the continuous heat processing furnace of this invention, a heat insulation layer and a ceramic fiber layer are made the same thickness about a side wall, a ceiling, and a floor. Moreover, it is preferable to perform forced stirring with a fan.

本発明の炉内の断面積（炉内空間部）は０．１６〜２．２５ｍ2であることが好ましい。さらに好ましくは０．６４〜１．４４ｍ2である。この断面積に前記仕様の断熱材とセラミックファイバー層を適用するのが好ましく、前記エネルギー効率も最適となる。また本発明の炉内の長さは１．５〜１５ｍが好ましく、さらに好ましくは２〜１０ｍである。 The cross-sectional area (furnace space) in the furnace of the present invention is preferably 0.16 to 2.25 m 2 . More preferably from 0.64~1.44m 2. It is preferable to apply the heat insulating material and ceramic fiber layer having the above specifications to the cross-sectional area, and the energy efficiency is also optimum. Moreover, 1.5-15m is preferable and, as for the length in the furnace of this invention, More preferably, it is 2-10m.

前記熱伝導率及び蓄熱量を有する断熱材と、前記の熱伝導率及び蓄熱量を有するセラミックファイバー層（耐火材）とを組合せることにより、優れた断熱性と耐久性を有する炉を得ることができる。   By combining the heat insulating material having the heat conductivity and the heat storage amount and the ceramic fiber layer (refractory material) having the heat conductivity and the heat storage amount, a furnace having excellent heat insulating properties and durability can be obtained. Can do.

前記の特性を有する断熱材はシリカ系のセラミックブロックなどが挙げられるが、耐熱温度は概ね１０００℃であり、例えば浸炭処理温度での耐熱性も本断熱材の単独使用でも問題ないように考えられる。しかしながら、断熱材の長期使用時の耐久性を考慮すると、表面により耐熱温度の高いセラミックファイバー層の耐火材を覆うことが必要であることがわかり、上記組合せを見出した。   Examples of the heat insulating material having the above-mentioned characteristics include a silica-based ceramic block, but the heat resistant temperature is approximately 1000 ° C. For example, the heat resistance at the carburizing temperature is considered not to be a problem even if the heat insulating material is used alone. . However, in view of durability during long-term use of the heat insulating material, it was found that it was necessary to cover the refractory material of the ceramic fiber layer having a high heat resistance temperature with the surface, and the above combination was found.

また、前記の厚さの断熱材とセラミックファイバー層の組合せが好ましい。炉の断熱性を向上させるために断熱材及びセラミックファイバー層を前記の範囲よりも厚くすると、炉内温度の降温制御が難しくなり、また、炉体の表面の面積が大きくなり放散熱量が増加する。   Moreover, the combination of the heat insulating material of the said thickness and a ceramic fiber layer is preferable. If the heat insulating material and the ceramic fiber layer are made thicker than the above ranges in order to improve the heat insulating property of the furnace, it becomes difficult to control the temperature drop in the furnace temperature, and the surface area of the furnace body becomes large and the amount of heat dissipated increases. .

エネルギー効率と炉の大きさ（設置スペース効率）を考慮すると、断熱材およびセラミックファイバーを本発明の範囲の厚さよりも厚くすることは不利であることがわかった。また、逆に断熱材及びセラミックファイバー層を前記範囲よりも薄くすると、断熱効果が十分に得られない。   Considering energy efficiency and furnace size (installation space efficiency), it has been found to be disadvantageous to make the insulation and ceramic fibers thicker than the thickness within the scope of the present invention. On the contrary, if the heat insulating material and the ceramic fiber layer are thinner than the above ranges, the heat insulating effect cannot be sufficiently obtained.

（比較例） (Comparative example)

連続熱処理炉における耐火レンガの厚さを１１５ｍｍ、耐火レンガの熱伝導率を０．１ｋｃａｌ／ｍ・ｈ・℃、断熱層（シリカ＃１０００）の厚さを６５ｍｍ、断熱層の熱伝導率を０．０４ｋｃａｌ／ｍ・ｈ・℃、セラミックファイバーの厚さを５０、セラミックファイバーの熱伝導率を０．０６ｋｃａｌ／ｍ・ｈ・℃とした。   In a continuous heat treatment furnace, the thickness of the refractory brick is 115 mm, the thermal conductivity of the refractory brick is 0.1 kcal / m · h · ° C., the thickness of the heat insulation layer (silica # 1000) is 65 mm, and the heat conductivity of the heat insulation layer is 0. 0.04 kcal / m · h · ° C., the thickness of the ceramic fiber was 50, and the thermal conductivity of the ceramic fiber was 0.06 kcal / m · h · ° C.

このようにした連続熱処理炉では、入熱が約１００，０００ｋｃａｌ／ｈに対して処理品加熱は約３２．５％、炉表面からの放散熱は約５９．１％、その他の部分からの放散熱は約８．４％、炉表面壁温度は１０１℃／ｍ2、放散熱量は７９４ｋｃａｌ／ｈ・ｍ2であった。 In such a continuous heat treatment furnace, the heat input is about 100,000 kcal / h, the heated product is about 32.5%, the heat dissipated from the furnace surface is about 59.1%, and the heat is released from other parts. The heat dissipation was about 8.4%, the furnace surface wall temperature was 101 ° C./m 2 , and the heat dissipation was 794 kcal / h · m 2 .

以上のことから本発明の連続熱処理炉によれば処理品加熱に比較例より約１５％の熱量が有効に使用されているのがわかる。また、炉表面壁から逃げる熱が少ないため、表面温度や放散熱量が少ないため、エネルギーロス、エネルギーコストを抑えることができることがわかる。   From the above, it can be seen that according to the continuous heat treatment furnace of the present invention, about 15% of the amount of heat is effectively used for heating the processed product from the comparative example. Further, it can be seen that since the heat escaping from the furnace surface wall is small, the surface temperature and the amount of heat dissipated are small, so that energy loss and energy cost can be suppressed.

以上、本発明の好適な実施の形態の一例を示したが、本発明はここで説明した形態に限定されない。例えば、前記実施例では、熱処理室２は浸炭処理を行うものとして説明したが、本発明は、窒化処理を行う熱処理炉にも適用することができる。   As mentioned above, although an example of the suitable embodiment of the present invention was shown, the present invention is not limited to the form explained here. For example, in the above-described embodiment, the heat treatment chamber 2 is described as performing a carburization process, but the present invention can also be applied to a heat treatment furnace performing a nitriding process.

本発明は、鋼材の浸炭処理、窒化処理などを行う連続熱処理炉に利用できる。   INDUSTRIAL APPLICABILITY The present invention can be used in a continuous heat treatment furnace that performs carburizing treatment, nitriding treatment, and the like of steel materials.

本発明の連続熱処理炉の縦断側面図である。It is a vertical side view of the continuous heat treatment furnace of the present invention. 図１に示す熱処理炉の要部の縦断側面図である。It is a vertical side view of the principal part of the heat processing furnace shown in FIG. 図２のＡ−Ａ線断面図である。It is the sectional view on the AA line of FIG.

符号の説明Explanation of symbols

１ 連続熱処理炉
２ 熱処理室
３ 油槽室
５ 炉体
５ａ 前側壁
５ｂ 後側壁
５ｃ 左側壁
５ｄ 右側壁
５ｅ 天井部
５ｆ 床部
６Ａ ゾーン
６Ｂ 降温ゾーン
６Ｃ 均熱ゾーン
１０ 搬入口
１１ シャッター
１２ テーブル
１５ 搬出口
１６ 中間シャッター
２０ ローラハース
２１ ファン
２２ 加熱器
３１ 炉殻層
３２ 断熱層
３３ セラミックファイバー層
４１ シール
４２ シール
４３ グラファイトパッキン
５７ ラジアントチューブ
５８ ガスバーナ
６１ 載置台
６２ 油槽
６３ 搬出口
６４ シャッター
６５ テーブル
Ｗ 被処理体 DESCRIPTION OF SYMBOLS 1 Continuous heat treatment furnace 2 Heat treatment room 3 Oil tank room 5 Furnace body 5a Front side wall 5b Rear side wall 5c Left side wall 5d Right side wall 5e Ceiling part 5f Floor part 6A Zone 6B Temperature-falling zone 6C Soaking zone 10 Carry-in port 11 Shutter 12 Table 15 Carry-out port 16 Intermediate shutter 20 Roller hearth 21 Fan 22 Heater 31 Furnace shell layer 32 Heat insulation layer 33 Ceramic fiber layer 41 Seal 42 Seal 43 Graphite packing 57 Radiant tube 58 Gas burner 61 Mounting table 62 Oil tank 63 Unloading port 64 Shutter 65 Table W Processed object

Claims (3)

被処理体を加熱して処理する連続熱処理炉であって、複数の熱処理室を有し、各熱処理室の炉体の天井部、床部及び側壁が、炉殻層と、前記炉殻層の内側に設けた断熱層と、前記断熱層の内側に設けたセラミックファイバー層とによって構成され、前記炉体内に、被処理体を載せる複数本のローラを設けたことを特徴とする連続熱処理炉。   A continuous heat treatment furnace that heats and treats an object to be processed, and has a plurality of heat treatment chambers, and a ceiling portion, a floor portion, and a side wall of the furnace body of each heat treatment chamber are formed of a furnace shell layer and the furnace shell layer. A continuous heat treatment furnace comprising a heat insulating layer provided on the inner side and a ceramic fiber layer provided on the inner side of the heat insulating layer, wherein a plurality of rollers for placing an object to be processed are provided in the furnace body. 前記各熱処理室を区画するシャッターを有し、前記シャッターが、断熱層と、この断熱層の両側に設けたセラミックファイバー層とによって構成されていることを特徴とする請求項１記載の連続熱処理炉。   The continuous heat treatment furnace according to claim 1, further comprising a shutter that partitions each heat treatment chamber, wherein the shutter includes a heat insulating layer and ceramic fiber layers provided on both sides of the heat insulating layer. . ガスバーナを用いた加熱器を備えたことを特徴とする請求項１または２記載の連続熱処理炉。   The continuous heat treatment furnace according to claim 1, further comprising a heater using a gas burner.
JP2005286133A 2005-09-30 2005-09-30 Continuous heat treatment furnace Active JP4982763B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005286133A JP4982763B2 (en) 2005-09-30 2005-09-30 Continuous heat treatment furnace

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005286133A JP4982763B2 (en) 2005-09-30 2005-09-30 Continuous heat treatment furnace

Publications (2)

Publication Number Publication Date
JP2007093161A true JP2007093161A (en) 2007-04-12
JP4982763B2 JP4982763B2 (en) 2012-07-25

Family

ID=37979090

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2005286133A Active JP4982763B2 (en) 2005-09-30 2005-09-30 Continuous heat treatment furnace

Country Status (1)

Country Link
JP (1) JP4982763B2 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007093160A (en) * 2005-09-30 2007-04-12 Dowa Holdings Co Ltd Heat treatment furnace
JP2009091632A (en) * 2007-10-10 2009-04-30 Dowa Thermotech Kk Heat-treatment apparatus and heat-treatment method
JP2010203767A (en) * 2010-04-12 2010-09-16 Dowa Holdings Co Ltd Heat treat furnace
JP2013204872A (en) * 2012-03-28 2013-10-07 Dowa Thermotech Kk Heat treatment furnace
CN103822482A (en) * 2012-11-16 2014-05-28 丹阳市江南工业炉有限公司 Industrial heating furnace
CN107314670A (en) * 2017-08-15 2017-11-03 大石桥市宝鼎耐火材料有限公司 Uprush refractory material burns till tunnel cave and its process for calcining
CN110607429A (en) * 2019-09-27 2019-12-24 中冶南方（武汉）热工有限公司 Roller hearth type plate continuous furnace and tempering method thereof

Citations (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4424169Y1 (en) * 1967-10-30 1969-10-13
JPS5045709A (en) * 1973-08-28 1975-04-24
JPS5044941U (en) * 1973-08-23 1975-05-07
JPS5216504A (en) * 1975-07-30 1977-02-07 Japan Gasoline Antiiacidic* refractory and adiadatic materials for heating furnaces
JPS5550488U (en) * 1978-09-29 1980-04-02
JPS56108821A (en) * 1980-07-25 1981-08-28 Chugai Ro Kogyo Kaisha Ltd Atmospheric heat treating furnace having wall made of ceramic fiber
JPS5887233A (en) * 1981-11-18 1983-05-25 Nippon Steel Corp Continuous annealing furnace
JPS60146299U (en) * 1984-03-09 1985-09-28 川崎製鉄株式会社 Heat-resistant cloth insulation door
JPS6363697U (en) * 1986-10-15 1988-04-27
JPH01296083A (en) * 1988-05-25 1989-11-29 Nichias Corp Furnace wall lining unit
JPH01312385A (en) * 1988-06-09 1989-12-18 Murata Mfg Co Ltd Batch-type firing furnace
JPH03229829A (en) * 1990-02-03 1991-10-11 Daido Steel Co Ltd Direct fire type continuous annealing furnace for cold rolled steel sheet
JPH0552478A (en) * 1991-08-22 1993-03-02 Mitsui Mining & Smelting Co Ltd Pusher type electric furnace
JPH0979761A (en) * 1995-09-18 1997-03-28 Dowa Mining Co Ltd Heat treating furnace
JPH09310984A (en) * 1996-05-22 1997-12-02 Nippon Steel Chem Co Ltd Partition wall structure for industrial furnace
JPH111759A (en) * 1997-06-06 1999-01-06 Dowa Mining Co Ltd Gas carburizing method and its device
JPH11201655A (en) * 1998-01-13 1999-07-30 Nippon Steel Corp Inner wall of heat treatment furnace
JP2001255073A (en) * 2000-03-13 2001-09-21 Daido Steel Co Ltd Vacuum furnace
JP2002039684A (en) * 2000-07-25 2002-02-06 Toho Gas Co Ltd Heat treatment device and method thereof
JP2002235164A (en) * 2001-02-08 2002-08-23 Nachi Fujikoshi Corp Partition door of continuous vacuum carburizing furnace
JP2002357389A (en) * 2001-06-04 2002-12-13 Dowa Mining Co Ltd Vacuum heat treating furnace
JP2002364985A (en) * 2001-06-11 2002-12-18 Nippon Steel Corp Furnace lining
JP2003240440A (en) * 2002-02-12 2003-08-27 Dowa Mining Co Ltd Heat treat furnace
JP2004183013A (en) * 2002-11-29 2004-07-02 Dowa Mining Co Ltd Heat treatment method and heat treatment furnace
JP2006078138A (en) * 2004-09-13 2006-03-23 Dowa Mining Co Ltd Heat treat furnace
JP2007093160A (en) * 2005-09-30 2007-04-12 Dowa Holdings Co Ltd Heat treatment furnace
JP2010203767A (en) * 2010-04-12 2010-09-16 Dowa Holdings Co Ltd Heat treat furnace

Patent Citations (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4424169Y1 (en) * 1967-10-30 1969-10-13
JPS5044941U (en) * 1973-08-23 1975-05-07
JPS5045709A (en) * 1973-08-28 1975-04-24
JPS5216504A (en) * 1975-07-30 1977-02-07 Japan Gasoline Antiiacidic* refractory and adiadatic materials for heating furnaces
JPS5550488U (en) * 1978-09-29 1980-04-02
JPS56108821A (en) * 1980-07-25 1981-08-28 Chugai Ro Kogyo Kaisha Ltd Atmospheric heat treating furnace having wall made of ceramic fiber
JPS5887233A (en) * 1981-11-18 1983-05-25 Nippon Steel Corp Continuous annealing furnace
JPS6217009B2 (en) * 1981-11-18 1987-04-15 Nippon Steel Corp
JPS60146299U (en) * 1984-03-09 1985-09-28 川崎製鉄株式会社 Heat-resistant cloth insulation door
JPS6337677Y2 (en) * 1984-03-09 1988-10-05
JPS6363697U (en) * 1986-10-15 1988-04-27
JPH01296083A (en) * 1988-05-25 1989-11-29 Nichias Corp Furnace wall lining unit
JPH01312385A (en) * 1988-06-09 1989-12-18 Murata Mfg Co Ltd Batch-type firing furnace
JPH03229829A (en) * 1990-02-03 1991-10-11 Daido Steel Co Ltd Direct fire type continuous annealing furnace for cold rolled steel sheet
JPH0552478A (en) * 1991-08-22 1993-03-02 Mitsui Mining & Smelting Co Ltd Pusher type electric furnace
JPH0979761A (en) * 1995-09-18 1997-03-28 Dowa Mining Co Ltd Heat treating furnace
JPH09310984A (en) * 1996-05-22 1997-12-02 Nippon Steel Chem Co Ltd Partition wall structure for industrial furnace
JPH111759A (en) * 1997-06-06 1999-01-06 Dowa Mining Co Ltd Gas carburizing method and its device
JPH11201655A (en) * 1998-01-13 1999-07-30 Nippon Steel Corp Inner wall of heat treatment furnace
JP2001255073A (en) * 2000-03-13 2001-09-21 Daido Steel Co Ltd Vacuum furnace
JP2002039684A (en) * 2000-07-25 2002-02-06 Toho Gas Co Ltd Heat treatment device and method thereof
JP2002235164A (en) * 2001-02-08 2002-08-23 Nachi Fujikoshi Corp Partition door of continuous vacuum carburizing furnace
JP2002357389A (en) * 2001-06-04 2002-12-13 Dowa Mining Co Ltd Vacuum heat treating furnace
JP2002364985A (en) * 2001-06-11 2002-12-18 Nippon Steel Corp Furnace lining
JP2003240440A (en) * 2002-02-12 2003-08-27 Dowa Mining Co Ltd Heat treat furnace
JP2004183013A (en) * 2002-11-29 2004-07-02 Dowa Mining Co Ltd Heat treatment method and heat treatment furnace
JP2006078138A (en) * 2004-09-13 2006-03-23 Dowa Mining Co Ltd Heat treat furnace
JP2007093160A (en) * 2005-09-30 2007-04-12 Dowa Holdings Co Ltd Heat treatment furnace
JP2010203767A (en) * 2010-04-12 2010-09-16 Dowa Holdings Co Ltd Heat treat furnace

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007093160A (en) * 2005-09-30 2007-04-12 Dowa Holdings Co Ltd Heat treatment furnace
JP2009091632A (en) * 2007-10-10 2009-04-30 Dowa Thermotech Kk Heat-treatment apparatus and heat-treatment method
JP2010203767A (en) * 2010-04-12 2010-09-16 Dowa Holdings Co Ltd Heat treat furnace
JP2013204872A (en) * 2012-03-28 2013-10-07 Dowa Thermotech Kk Heat treatment furnace
CN103822482A (en) * 2012-11-16 2014-05-28 丹阳市江南工业炉有限公司 Industrial heating furnace
CN107314670A (en) * 2017-08-15 2017-11-03 大石桥市宝鼎耐火材料有限公司 Uprush refractory material burns till tunnel cave and its process for calcining
CN110607429A (en) * 2019-09-27 2019-12-24 中冶南方（武汉）热工有限公司 Roller hearth type plate continuous furnace and tempering method thereof
CN110607429B (en) * 2019-09-27 2021-03-16 中冶南方（武汉）热工有限公司 Roller hearth type plate continuous furnace and tempering method thereof

Also Published As

Publication number Publication date
JP4982763B2 (en) 2012-07-25

Similar Documents

Publication Publication Date Title
JP4982763B2 (en) Continuous heat treatment furnace
JP4458107B2 (en) Vacuum carburizing method and vacuum carburizing apparatus
JP4982762B2 (en) Heat treatment furnace
JP5577573B2 (en) Vacuum carburizing method and vacuum carburizing apparatus
KR20060089184A (en) Apparatus for measuring carbon concentration in atmoshere having reduced pressure
JP4876279B2 (en) Heat treatment furnace
JP4493881B2 (en) Vacuum heat treatment furnace
JP4982726B2 (en) Heat treatment furnace
JP3581140B2 (en) Continuous carburizing furnace
JP5410652B2 (en) Heat treatment furnace
JP4934828B2 (en) Nitriding furnace and nitriding method
JP6184718B2 (en) Heat treatment furnace
JP2009091632A (en) Heat-treatment apparatus and heat-treatment method
JP3535630B2 (en) Heat treatment furnace
JP5830787B2 (en) Continuous heat treatment furnace
JP2022042560A (en) Heat treatment furnace and method for producing inorganic material using heat treatment furnace
JP6836858B2 (en) Heat treatment equipment
Bernard et al. Multiple Chamber Vacuum Furnaces vs. Single-Chamber Vacuum Furnaces—A Review
JP5582792B2 (en) Heating device
JP2005221135A (en) Burning furnace
JP2006152336A (en) Conveying device in continuous heat treatment furnace for metal strip
JP2022074158A (en) Thermal treatment device
JP2018080891A (en) Wall surface material and heat treat furnace
JP2003042664A (en) Vacuum heating furnace
SU1476281A1 (en) Heat/chemical treatment plant

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20080729

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20110727

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110801

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20110930

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20111109

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20120106

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20120307

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20120330

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20120330

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A821

Effective date: 20120330

R150 Certificate of patent or registration of utility model

Ref document number: 4982763

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150511

Year of fee payment: 3

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250