JPH05187777A - Atmosphere furnace - Google Patents
Atmosphere furnaceInfo
- Publication number
- JPH05187777A JPH05187777A JP2178092A JP2178092A JPH05187777A JP H05187777 A JPH05187777 A JP H05187777A JP 2178092 A JP2178092 A JP 2178092A JP 2178092 A JP2178092 A JP 2178092A JP H05187777 A JPH05187777 A JP H05187777A
- Authority
- JP
- Japan
- Prior art keywords
- chamber
- carry
- furnace
- pressure
- door
- 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.)
- Pending
Links
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- Furnace Details (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Tunnel Furnaces (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、特に保護雰囲気ガス
(被処理物が酸化しない成分を有するガス)を炉本体内
に充填して使用する雰囲気炉に関し、更に詳しくは、雰
囲気ガスが充填される炉本体の両側に設けられた入口ド
アと出口ドアとを同時に開閉することにより、被処理物
を搬入室から前記炉本体内に搬入し、かつ、前記炉本体
内で加熱処理された別の被処理物を前記炉本体内から搬
出室に搬出するようにした雰囲気炉に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an atmosphere furnace in which a protective atmosphere gas (a gas having a component that does not oxidize an object to be treated) is charged into a furnace body for use. By simultaneously opening and closing the entrance door and the exit door provided on both sides of the furnace main body, the object to be processed is carried into the furnace main body from the carry-in chamber, and another heat treatment is performed in the furnace main body. The present invention relates to an atmosphere furnace configured to carry out an object to be processed from the furnace body to a carry-out chamber.
【0002】[0002]
【従来の技術】この種の雰囲気炉としては、炉圧の低い
炉内変成方式のガス浸炭炉や調質炉がある。例えば、炉
内変成方式のガス浸炭炉にあっては、吸入した炭化水素
ガス(例えばHC)やCO等を炉内で浸炭性の不活性ガ
スに変えるようにしており、その結果として浸炭性ガス
の他にCO2 ,H2 O,N2 等が生じてこれらが排ガス
となる。2. Description of the Related Art As an atmosphere furnace of this kind, there is a gas carburizing furnace and a refining furnace of an in-furnace metamorphism system having a low furnace pressure. For example, in a gas carburizing furnace of in-reactor conversion system, the inhaled hydrocarbon gas (for example, HC) or CO is converted into a carburizing inert gas in the furnace, resulting in carburizing gas. in addition to CO 2, H 2 O, these N 2, etc., occurs the exhaust gas.
【0003】連続式ガス浸炭炉は、通常、浸炭性の雰囲
気ガスが充填される炉本体と、この炉本体の両側部に配
設された搬入室及び搬出室とをそれぞれ具備しており、
炉本体の両側に設けられた入口ドア及び出口ドアが同時
に開閉されるように構成されている。そして、入口ドア
及び出口ドアが開かれた時に、被処理品(ワーク)が搬
入室から炉本体内へ搬入されるのに応じて加熱浸炭され
た被処理品が炉本体内から搬出室へ搬出されて油液にて
急冷されるようになっている。A continuous gas carburizing furnace is usually equipped with a furnace body filled with a carburizing atmosphere gas, and a carry-in chamber and a carry-out chamber arranged on both sides of the furnace body, respectively.
The entrance door and the exit door provided on both sides of the furnace body are configured to be simultaneously opened and closed. Then, when the entrance door and the exit door are opened, the processed product (workpiece) is carried into the furnace body from the carry-in chamber, and the heated and carburized product is carried out from the furnace body to the carry-out chamber. It is then cooled with oil.
【0004】この種の雰囲気炉にあっては、搬出室内に
加熱状態の被処理品が移送されると搬出室内の温度が上
昇して熱膨張(体積膨張)が生じ、搬出室内の圧力が上
昇する。一方、被処理品が急冷されると熱源がなくなる
ため、体積収縮が生じて搬出室内の圧力が低下する。ま
た、この種の雰囲気炉の場合、炉室(加熱室)内に導入
した雰囲気ガスの余量を外部に放出する必要がある。こ
のような事情から搬入室及び搬出室にエキゾースト機構
(排・吸気口)がそれぞれ設けられている。In this type of atmosphere furnace, when a heated object is transferred into the carry-out chamber, the temperature in the carry-out chamber rises and thermal expansion (volume expansion) occurs, and the pressure in the carry-out chamber rises. To do. On the other hand, when the article to be processed is rapidly cooled, the heat source disappears, so that volume contraction occurs and the pressure in the carry-out chamber decreases. Further, in the case of this type of atmospheric furnace, it is necessary to discharge the surplus amount of the atmospheric gas introduced into the furnace chamber (heating chamber) to the outside. Under such circumstances, exhaust mechanisms (exhaust / intake ports) are provided in the carry-in chamber and the carry-out chamber, respectively.
【0005】従来においては、搬入室及び搬出室にそれ
ぞれ配設されるエキゾースト機構は、共に、室内の圧力
が所定の正圧の時にのみ自動的に開状態となり、室内の
圧力が負圧の時にはエアシリンダ等のアクチュエータに
て強制的に開状態にし得るように構成したものが使用さ
れている。Conventionally, both the exhaust mechanisms provided in the carry-in chamber and the exhaust mechanism are automatically opened only when the pressure inside the chamber is a predetermined positive pressure, and when the pressure inside the chamber is negative pressure. An actuator such as an air cylinder that is configured to be forcibly opened is used.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、上述の
如き従来の雰囲気炉では、搬入室及び搬出室のエキゾー
スト機構は、吸気のタイミングのコントロールはアクチ
ュエータで強制的に行なうことができるものの、排気の
タイミングは内圧上昇に応じて自動的に行なわれるた
め、排気のコントロールは任意に行なうことができない
のが実状である。そのため、搬出室のエキゾースト機構
から吸気したカーボンポテンシャルの低い(露点の高
い)雰囲気ガスが炉本体(加熱室)内に逆流し、これに
より被処理品の表面が酸化されてしまうという問題点が
ある。このような酸化現象を生じると、被処理品の外観
にばらつきを生じる上に、疲労強度が低下するという不
具合を生じることとなる。However, in the conventional atmosphere furnace as described above, the exhaust mechanism of the carry-in chamber and the carry-out chamber can control the intake timing by the actuator, but the exhaust timing can be controlled. Since it is automatically performed according to the increase in internal pressure, the actual situation is that the exhaust control cannot be arbitrarily performed. Therefore, there is a problem that the atmospheric gas with a low carbon potential (high dew point) sucked from the exhaust mechanism of the carry-out chamber flows back into the furnace body (heating chamber), and the surface of the object to be treated is oxidized. .. When such an oxidation phenomenon occurs, the appearance of the article to be processed varies, and the fatigue strength decreases.
【0007】本発明は、このような問題点を解消すべく
なされたものであって、その目的は、搬出室から搬入室
へのカーボンポテンシャルの低い雰囲気ガスの逆流を防
止し得て、被処理品の表面酸化を低減することができる
ような雰囲気炉を提供することにある。The present invention has been made to solve such a problem, and an object thereof is to prevent backflow of an atmospheric gas having a low carbon potential from a carry-out chamber to a carry-in chamber and to be processed. An object of the present invention is to provide an atmospheric furnace that can reduce surface oxidation of products.
【0008】[0008]
【課題を解決するための手段】上述の目的を達成するた
めに、本発明では、雰囲気ガスが充填される炉本体の両
側に設けられた入口ドアと出口ドアとを同時に開閉する
ことにより、被処理物を搬入室から前記炉本体内に搬入
し、かつ、前記炉本体内で加熱処理された別の被処理物
を前記炉本体内から搬出室に搬出するようにした雰囲気
炉において、前記搬入室内の圧力とは無関係に強制開閉
可能なエキゾースト機構を前記搬入室に設けると共に、
前記搬出室内の圧力が所定の正圧になると自動的に開状
態になるエキゾースト機構を前記搬出室に設け、前記入
口ドア及び出口ドアの閉扉後に前記搬入室のエキゾース
ト機構が強制的に開状態になるように構成し、これによ
り、前記炉本体内での雰囲気ガスの流れを前記搬入室か
ら前記搬出室へ向かう方向になるようにしている。In order to achieve the above-mentioned object, in the present invention, by simultaneously opening and closing an inlet door and an outlet door provided on both sides of a furnace body filled with atmospheric gas, In the atmospheric furnace, the processed product is carried into the furnace body from the carry-in chamber, and another object to be processed that has been heat-treated in the furnace body is carried out from the furnace body to the carry-out chamber. An exhaust mechanism that can be forcibly opened and closed regardless of the pressure in the room is provided in the carry-in room,
An exhaust mechanism that automatically opens when the pressure in the carry-out chamber reaches a predetermined positive pressure is provided in the carry-out chamber, and the exhaust mechanism of the carry-in chamber is forcibly opened after closing the entrance door and the exit door. With this configuration, the flow of the atmospheric gas in the furnace body is directed from the loading chamber to the unloading chamber.
【0009】[0009]
【作用】搬入室側のエキゾースト機構を開状態にするタ
イミングを炉本体の入口ドア及び出口ドアの閉扉後にず
らすことにより、炉本体内(炉室内)の雰囲気ガスの流
れが搬入室から搬出室に向かう方向になり、雰囲気ガス
の逆流が防止される。[Operation] By shifting the timing of opening the exhaust mechanism on the loading chamber side after closing the inlet door and the exit door of the furnace body, the flow of atmospheric gas in the furnace body (furnace chamber) changes from the loading chamber to the loading chamber. This is the direction to go, and the backflow of atmospheric gas is prevented.
【0010】[0010]
【実施例】図1及び図2は、本発明を適用した連続浸炭
用の雰囲気炉(連続ガス浸炭炉)1を示すものである。
この雰囲気炉1は、両側部に入口ドア2及び出口ドア3
が設けられた横長の炉本体4と、この炉本体4の両側部
に隣接配置された搬入室5及び搬出室(油槽室)6と搬
出室6の下部に連設された油槽7とをそれぞれ具備して
いる。FIG. 1 and FIG. 2 show an atmosphere furnace (continuous gas carburizing furnace) 1 for continuous carburizing to which the present invention is applied.
This atmosphere furnace 1 has an entrance door 2 and an exit door 3 on both sides.
A horizontally long furnace body 4, a loading chamber 5 and an unloading chamber (oil tank chamber) 6 that are arranged adjacent to each other on both sides of the furnace body 4, and an oil tank 7 that is continuously provided below the unloading chamber 6. It has.
【0011】上述の入口ドア2及び出口ドア3は図外の
駆動手段により同時に開閉制御されるように構成されて
おり、これらのドア2,3が開かれると、炉本体4内の
炉室4aと搬入室5及び搬出室6とが互いに連通状態と
なるように構成されている。なお、炉本体4内(炉室4
a内)には、所定の浸炭ガスが雰囲気ガスとして充填さ
れており、複数の炉内攪拌ファン8にて雰囲気ガスが攪
拌されるようになっている。The above-mentioned entrance door 2 and exit door 3 are constructed to be controlled to be opened and closed at the same time by a driving means (not shown), and when these doors 2 and 3 are opened, the furnace chamber 4a in the furnace body 4 is opened. And the carry-in chamber 5 and the carry-out chamber 6 are in communication with each other. In addition, inside the furnace body 4 (furnace chamber 4
In (a), a predetermined carburizing gas is filled as an atmosphere gas, and the atmosphere gas is agitated by a plurality of in-furnace agitation fans 8.
【0012】さらに、搬入室5側には、ワークトレー
(図示せず)上に載置されて搬入室5内に次々に供給さ
れる被処理品(ワーク)9を1個ずつ炉本体4内に向け
て押し出すメインプッシャー10が配設されている。そ
して、ワークトレー上に載置された被処理品9が前記メ
インプッシャー10にて押し出されて炉本体4内に搬入
されるのに伴って、炉本体4内において長手方向に沿っ
て一列状に並べられた被処理品9が図1及び図2におい
て矢印A方向すなわち搬入室5から搬出室6に向かう方
向に1個分づつ順次移動されるようになっている。Further, on the carrying-in chamber 5 side, the articles (work) 9 placed on a work tray (not shown) and successively supplied into the carrying-in chamber 5 are provided in the furnace body 4 one by one. A main pusher 10 that pushes out toward is disposed. Then, as the article 9 to be processed placed on the work tray is pushed out by the main pusher 10 and carried into the furnace body 4, the furnace body 4 is lined up in a line along the longitudinal direction. One by one the processed articles 9 arranged side by side in the direction of arrow A in FIG. 1 and FIG. 2, that is, in the direction from the carry-in chamber 5 to the carry-out chamber 6.
【0013】また、搬入室5及び搬出室6には、エキゾ
ースト機構(排気・吸気用の機構)12及び13がそれ
ぞれ配設されている。搬入室5側のエキゾースト機構1
2は、搬入室5内の圧力とは無関係に強制開閉される型
式のものであって、図3に示すように、搬入室5に接続
されたエキゾーストパイプ14と、このエキゾーストパ
イプ14の上端開口室14a内に配置されたリングバー
ナー15と、この上端開口室14aに対応して配置され
たパイロットバーナー16と、前記上端開口室14a内
に配置されてエキゾーストパイプ14を開閉する弁体
(シール板)17と、この弁体を強制的に駆動制御する
エアシリンダ18等から成る駆動手段19とで構成され
ている。なお、本例においては、前記弁体17は平板に
て構成され、この弁体17がエキゾーストパイプ14の
平坦状の弁座20に圧着するように構成されている。Exhaust mechanisms (exhaust / intake mechanisms) 12 and 13 are provided in the carry-in chamber 5 and the carry-out chamber 6, respectively. Exhaust mechanism 1 on the loading room 5 side
2 is a type that is forcibly opened / closed regardless of the pressure in the carry-in chamber 5, and as shown in FIG. 3, an exhaust pipe 14 connected to the carry-in chamber 5 and an upper end opening of the exhaust pipe 14. A ring burner 15 arranged in the chamber 14a, a pilot burner 16 arranged corresponding to the upper end opening chamber 14a, and a valve body (sealing plate) arranged in the upper end opening chamber 14a for opening and closing the exhaust pipe 14 ) 17, and a drive means 19 including an air cylinder 18 for forcibly driving and controlling this valve body. In this example, the valve element 17 is formed of a flat plate, and the valve element 17 is configured to be crimped to the flat valve seat 20 of the exhaust pipe 14.
【0014】一方、搬出室6側のエキゾースト機構13
は搬出室6内の圧力が正圧であるときにのみ自動的に開
弁される従来型式のものであって、図4に示すように、
搬出室6に接続されたエキゾーストパイプ21と、この
エキゾーストパイプ21の上端開口室21a内に配置さ
れたリングバーナー22と、この上端開口室14aに対
応して配設されたパイロットバーナー23と、前記上端
開口室21a内に配置されて搬出室6内の圧力が所定の
正圧のときのみ自動的に差動されてエキゾーストパイプ
21を開閉する弁体(シール板)24と、搬出室6内の
圧力が負圧のときに前記弁体24を強制的に開弁するエ
アシリンダ25等から成る駆動手段26とで構成されて
いる。なお、上述の弁体24は球面状のシール面24a
を有する断面が三日月形の部材から成り、この弁体24
のシール面24aがエキゾーストパイプ21の球面状の
弁座27に圧着するように構成されている。On the other hand, the exhaust mechanism 13 on the discharge chamber 6 side
Is a conventional type that is automatically opened only when the pressure in the carry-out chamber 6 is a positive pressure, and as shown in FIG.
An exhaust pipe 21 connected to the carry-out chamber 6, a ring burner 22 arranged in the upper end opening chamber 21a of the exhaust pipe 21, a pilot burner 23 arranged corresponding to the upper end opening chamber 14a, A valve element (seal plate) 24 that is arranged in the upper end opening chamber 21a and is automatically differentiated only when the pressure in the unloading chamber 6 is a predetermined positive pressure to open and close the exhaust pipe 21, and the unloading chamber 6 The driving means 26 is composed of an air cylinder 25 and the like for forcibly opening the valve element 24 when the pressure is a negative pressure. The above-mentioned valve body 24 has a spherical sealing surface 24a.
This valve body 24 is composed of a crescent-shaped member having a cross section
The sealing surface 24a is configured to be pressed against the spherical valve seat 27 of the exhaust pipe 21.
【0015】ところで、上述のように搬出室6側のエキ
ゾースト機構13は従来より使用されているものであり
球状シール面を備えているのに対し、搬入室5側のエキ
ゾースト機構12は従来のものと異なり平坦状シール面
を備えている。そのため、エキゾースト機構12はエキ
ゾースト機構13に比べて、加工がし易く、シール面の
当たりの修正も容易に行なうことが可能である上に、シ
ール面の気密性、信頼性が高く、雰囲気ガスの流出を極
小に抑えることが可能である。By the way, as described above, the exhaust mechanism 13 on the carry-out chamber 6 side is conventionally used and has a spherical sealing surface, whereas the exhaust mechanism 12 on the carry-in chamber 5 side is conventional. Unlike, it has a flat sealing surface. Therefore, as compared with the exhaust mechanism 13, the exhaust mechanism 12 is easier to process and can easily correct the contact of the seal surface, and the airtightness and reliability of the seal surface are high, and the atmosphere gas It is possible to minimize the outflow.
【0016】また、図1に示すように、前記搬出室6に
関連してその内部に昇降板28が配設されており、油槽
7と搬出室6との間を上下動し得るようになっている。
さらに、搬出室6には、被処理品搬出用の出口ドア29
が設けられている。一方、搬入室5には、図2に示すよ
うに被処理品搬入用の入口ドア30が設けられ、この入
口ドア30に対応してサブプッシャー31が配設されて
いる。Further, as shown in FIG. 1, an elevating plate 28 is provided inside the discharge chamber 6 so that it can move up and down between the oil tank 7 and the discharge chamber 6. ing.
Further, the carry-out chamber 6 has an exit door 29 for carrying out the processed product.
Is provided. On the other hand, in the carry-in chamber 5, as shown in FIG. 2, an entrance door 30 for carrying in the article to be processed is provided, and a sub-pusher 31 is arranged corresponding to the entrance door 30.
【0017】次に、上述の如き構成の雰囲気炉1にて被
処理品9を浸炭処理する際の動作及び作用に付き説明す
る。Next, the operation and action when carburizing the article 9 to be treated in the atmosphere furnace 1 having the above-described structure will be described.
【0018】まず、雰囲気炉1を操業するに当たって
は、炉本体4の炉室4a内に浸炭性の雰囲気ガスを充填
すると共に炉内攪拌ファン8を作動して炉室4a内に雰
囲気ガスを均一に充満させる。また、油槽7内には適当
量の油液を貯えておく。First, in operating the atmosphere furnace 1, the furnace chamber 4a of the furnace body 4 is filled with a carburizing atmosphere gas and the furnace stirring fan 8 is operated to make the atmosphere gas uniform in the furnace chamber 4a. Fill up. In addition, an appropriate amount of oil liquid is stored in the oil tank 7.
【0019】このような状態の下で、炉本体4の入口ド
ア2及び出口ドア3が図外の駆動手段にて同時に開扉さ
れると、これに同期してメインプッシャー10が作動さ
れる。これに伴い、前工程ラインから移送されてサブプ
ッシャー31にて搬入室5内に搬送された被処理品9
(ワークトレー上に予め載置された被処理品9)が、前
記メインプッシャー10により押圧され、入口ドア2を
通って炉本体4の炉室4a内に移送される。そして、被
処理品9の炉室4a内への搬入操作に応じて、炉室4a
内において一列状に配列された他の各々の被処理品9が
矢印A方向(出口ドア3に向かう方向)に間欠的に1個
分ずつ移動され、出口ドア3を通って搬出室6内に被処
理品9′が1個ずつ間欠的に押し出される。Under this condition, when the inlet door 2 and the outlet door 3 of the furnace body 4 are simultaneously opened by a driving means (not shown), the main pusher 10 is operated in synchronization with this. Along with this, the article to be processed 9 transferred from the previous process line and transferred into the carry-in chamber 5 by the sub pusher 31.
The object 9 to be processed which has been placed on the work tray in advance is pressed by the main pusher 10 and transferred into the furnace chamber 4a of the furnace body 4 through the inlet door 2. Then, in response to the operation of loading the article to be processed 9 into the furnace chamber 4a, the furnace chamber 4a
Each of the other products to be processed 9 arranged in a line in the inside is intermittently moved one by one in the direction of arrow A (direction toward the exit door 3), and passes through the exit door 3 into the carry-out chamber 6. The processed products 9'are extruded one by one intermittently.
【0020】炉室4a内では、被処理品9が雰囲気ガス
中で所定温度に加熱され、浸炭処理が施される。そし
て、浸炭処理されて炉室4aから搬出室6内に送り出さ
れた被処理品9′は昇降板28上に載置され、その直後
に昇降板28が下降される。これにより、被処理品9′
が油槽7内の油液中に浸されて急冷され、しかる後に、
昇降板28が被処理品9′と共に上昇される。そして、
処理済の被処理品9′は、メインプッシャー10による
トレー送り、すなわち入口ドア2及び及び出口ドア3の
開扉に先行して搬出室6の出口ドア29が時点t9 に開
かれるのに伴い炉外にあるフォーク等の搬出装置により
搬出され、次工程に送られる。この際、出口ドア29が
単独で開かれると、搬出室6内の圧力P0 は大きく低下
する。また、搬出室6と炉室4a、及び炉室4aと搬入
室5との間には小さなベント穴(図示せず)があるた
め、炉室4a内の圧力PH 及び搬入室5内の圧力Pi も
少々変化する。In the furnace chamber 4a, the article 9 to be treated is heated to a predetermined temperature in an atmosphere gas and carburized. Then, the object 9 ′ which has been carburized and sent out from the furnace chamber 4 a into the carry-out chamber 6 is placed on the elevating plate 28, and immediately after that, the elevating plate 28 is lowered. As a result, the processed product 9 '
Is soaked in the oil liquid in the oil tank 7 and rapidly cooled, and thereafter,
The elevating plate 28 is raised together with the article 9'to be processed. And
The processed article 9 ′ that has been processed is transferred to the tray by the main pusher 10, that is, as the exit door 29 of the carry-out chamber 6 is opened at time t 9 prior to the opening of the entrance door 2 and the exit door 3. It is carried out by a carry-out device such as a fork outside the furnace and sent to the next process. At this time, if the outlet door 29 is opened alone, the pressure P 0 in the carry-out chamber 6 is greatly reduced. Further, since there are small vent holes (not shown) between the carry-out chamber 6 and the furnace chamber 4a, and between the furnace chamber 4a and the carry-in chamber 5, the pressure P H in the furnace chamber 4a and the pressure in the carry-in chamber 5 are P i also changes slightly.
【0021】一方、搬入室5及び搬出室6のエキゾース
ト機構12,13は、図5のタイミングチャートに示す
如く作動する。On the other hand, the exhaust mechanisms 12 and 13 of the carry-in chamber 5 and the carry-out chamber 6 operate as shown in the timing chart of FIG.
【0022】まず、被処理品9を処理するための1サイ
クルの初期時には、炉本体4の入口ドア2及び出口ドア
3、搬入室5の入口ドア30、並びに搬出室6の出口ド
ア29は全て閉じられており、昇降板28は上昇位置に
配置されている。かくして、1サイクルが開始される
と、搬入室5の入口ドア30が開扉され、その開扉開始
時点t1 の直後の時点t2 にサブプッシャー31が作動
開始される。これに伴って、搬入室5内の被処理品9が
サブプッシャー31にて搬入室5内の所定位置に配置さ
れる。First, at the beginning of one cycle for treating the article to be treated 9, the entrance door 2 and the exit door 3 of the furnace body 4, the entrance door 30 of the carry-in chamber 5, and the exit door 29 of the carry-out chamber 6 are all It is closed and the lift plate 28 is arranged in the raised position. Thus, when one cycle is started, the entrance door 30 of the carry-in chamber 5 is opened, and the sub-pusher 31 is actuated at a time point t 2 immediately after the door opening start time point t 1 . Along with this, the article to be processed 9 in the carry-in chamber 5 is placed at a predetermined position in the carry-in chamber 5 by the sub pusher 31.
【0023】その後に(時点t3 )炉本体4の入口ドア
2及び出口ドア3が同時に開扉開始され、その直後の時
点t4 にメインプッシャー10が作動開始される。これ
に伴い、搬入室5内の被処理品9がメインプッシャー1
0にて押され、入口ドア2を通って炉本体4の炉室4a
内のワークトレー上に載置される。その後メインプッシ
ャー10は復動される。[0023] subsequently to (time t 3) furnace inlet door 2 and the exit door 3 of the body 4 is open door started simultaneously, the main pusher 10 starts operating at the time t 4 immediately thereafter. Along with this, the article to be processed 9 in the carry-in chamber 5 is transferred to the main pusher 1
0, pushed through the entrance door 2 and the furnace chamber 4a of the furnace body 4
It is placed on the work tray inside. After that, the main pusher 10 is returned.
【0024】このようにして、被処理品9が搬入室5か
ら炉室4a内に押し込まれると、それ以前に炉室4a内
に搬入されて一列状に整列された複数の被処理品9が出
口ドア3の側に向けて移動されると共に、炉室4a内で
加熱されて浸炭処理された被処理品9′が出口ドア3を
通って搬出室6内の昇降板28上に押し出される。In this manner, when the article 9 to be treated is pushed into the furnace chamber 4a from the carry-in chamber 5, a plurality of the article 9 to be treated, which has been carried into the furnace chamber 4a and aligned in a row, before that. The workpiece 9 ′ that has been moved toward the outlet door 3 side and heated in the furnace chamber 4 a and carburized is pushed out through the outlet door 3 onto the elevating plate 28 in the carry-out chamber 6.
【0025】この場合、搬出室6内には加熱状態の被処
理品9′が熱源として存在するため、搬出室6内の圧力
P0 は急激に上昇せしめられて相対的に高い正圧にな
る。これに応じて、搬出室6側のエキゾースト機構13
は時点t3 直後の時点t5 から自動的に開弁状態になる
(但し、この時には搬入室5側のエキゾースト機構12
は閉状態である)。このため、熱膨張した雰囲気がエキ
ゾースト機構13を通して外部へ排出される。これに伴
い、炉室4a内の圧力は所定の正圧から一時的に低下さ
れると共に、搬出室6内の圧力P0 は大気圧に近づくよ
うに徐々に低下される。なお、炉室4a内には図外のガ
ス供給手段から所定の雰囲気ガスが供給され、入口ドア
2及び出口ドア3の閉扉後の時点t6 には所定の正圧状
態に復帰される。In this case, since the article 9'in the heated state exists as a heat source in the carry-out chamber 6, the pressure P 0 in the carry-out chamber 6 is rapidly increased to a relatively high positive pressure. .. In response to this, the exhaust mechanism 13 on the discharge chamber 6 side
Is automatically opened from the time point t 5 immediately after the time point t 3 (however, at this time, the exhaust mechanism 12 on the carry-in chamber 5 side is
Is closed). Therefore, the thermally expanded atmosphere is discharged to the outside through the exhaust mechanism 13. Along with this, the pressure in the furnace chamber 4a is temporarily reduced from a predetermined positive pressure, and the pressure P 0 in the carry-out chamber 6 is gradually reduced to approach the atmospheric pressure. Note that the furnace chamber 4a is supplied a predetermined atmospheric gas from the gas supply means, not shown, the time t 6 after the closing of the inlet door 2 and the exit door 3 is returned to a predetermined positive pressure.
【0026】ところで、搬出室6内に加熱状態の被処理
品9′にて熱膨張された搬出室6内の雰囲気ガスは、エ
キゾースト機構13から外部へ出ると共に、炉室4a内
にも逆流しようとする(その理由は、搬出室6は容積が
小さいため、瞬間的には炉室4aより搬出室6内の圧力
が高くなると考えられるからである)。しかし、本例に
おいては、搬出室6内の体積膨張中には、搬入室5側の
エキゾースト機構12は閉状態の下に置かれているた
め、搬入室5側からの雰囲気の流出を防止できる。これ
により、搬出室3内のカーボンポテンシャルの低い雰囲
気が炉室4a内に流入するのを防止できる。その結果、
炉室4a内における雰囲気ガスは、搬入室2から搬出室
3の側に向けて常に一方向に流れることとなる。By the way, the atmospheric gas in the carry-out chamber 6 which has been thermally expanded in the carry-out chamber 6 by the article to be treated 9'that is in a heated state, flows out from the exhaust mechanism 13 to the outside and also flows back into the furnace chamber 4a. (The reason is that, since the carry-out chamber 6 has a small volume, the pressure in the carry-out chamber 6 is momentarily higher than that in the furnace chamber 4a). However, in this example, during the volume expansion in the carry-out chamber 6, the exhaust mechanism 12 on the carry-in chamber 5 side is placed under the closed state, so that the outflow of the atmosphere from the carry-in chamber 5 side can be prevented. .. This can prevent the atmosphere having a low carbon potential in the carry-out chamber 3 from flowing into the furnace chamber 4a. as a result,
The atmospheric gas in the furnace chamber 4a always flows in one direction from the carry-in chamber 2 to the carry-out chamber 3 side.
【0027】一方、搬入室5側の強制操作式のエキゾー
スト機構12は、前記入口ドア2及び出口ドア3の閉扉
時点t7 に同期して強制的に開弁される。これにより、
搬入室5内に存在する余量の雰囲気ガスが外部へ排出さ
れる。また、入口ドア2及び出口ドア3の閉扉に依って
生じた負圧はリングバーナー燃焼ガスの吸入により補わ
れ、搬入室5内の圧力が正規の炉圧に回復される。On the other hand, the forced operation type exhaust mechanism 12 on the side of the carry-in chamber 5 is compulsorily opened in synchronization with the closing time t 7 of the entrance door 2 and the exit door 3. This allows
The surplus atmospheric gas existing in the carry-in chamber 5 is discharged to the outside. Further, the negative pressure generated by the closing of the inlet door 2 and the outlet door 3 is compensated by the suction of the ring burner combustion gas, and the pressure in the carry-in chamber 5 is restored to the normal furnace pressure.
【0028】ここで、雰囲気ガスの流れについて、従来
の場合と比較して説明すれば、次の通りである。すなわ
ち、従来は、入口ドア2及び出口ドア3が開くのに応じ
て搬出室6側のエキゾースト機構13が開弁する期間T
(図5参照)中に本例の場合(時点t7 )よりも早い時
点t8 に搬入室5側のエキゾースト機構12が自動的に
開弁されるため、炉室4a内の圧力PH 、搬入室2内の
圧力Pi 及び搬出室3内の圧力Po が図5において破線
で示す如く急激に変化(低下)し、特にPH ≦Po とな
ると、雰囲気ガスの流れが止まったり、搬出室3から搬
入室2の側に逆流して既述の如き問題を生じる。これに
対し、本例の場合には、搬入室2側のエキゾースト機構
12の開弁時のタイミングを時点t8 から時点t7 に強
制的にずらすようにしているので、搬出室6内の雰囲気
の熱膨張時に搬入室5側のエキゾースト機構12から雰
囲気ガスが排出されることがない。従って雰囲気ガスの
流れの停止や逆流を防止でき、雰囲気ガスの流れを搬入
室2から搬出室3に向う一方向に設定できる。The flow of the atmospheric gas will be described below in comparison with the conventional case. That is, conventionally, the period T during which the exhaust mechanism 13 on the unloading chamber 6 side is opened in response to the opening of the entrance door 2 and the exit door 3
(See FIG. 5), the exhaust mechanism 12 on the side of the carry-in chamber 5 is automatically opened at a time point t 8 earlier than in the case of this example (time point t 7 ), so that the pressure P H in the furnace chamber 4a, When the pressure P i in the carry-in chamber 2 and the pressure P o in the carry-out chamber 3 suddenly change (decrease) as shown by the broken line in FIG. 5, particularly when P H ≦ P o , the flow of the atmospheric gas is stopped, Backflow from the carry-out chamber 3 to the carry-in chamber 2 causes the problem as described above. On the other hand, in the case of this example, the timing of opening the exhaust mechanism 12 on the carry-in chamber 2 side is forcibly shifted from the time point t 8 to the time point t 7 , so that the atmosphere inside the carry-out chamber 6 is changed. At the time of thermal expansion, the atmospheric gas is not discharged from the exhaust mechanism 12 on the carry-in chamber 5 side. Therefore, the flow of the atmospheric gas can be prevented from stopping and the backflow can be prevented, and the flow of the atmospheric gas can be set in one direction from the carry-in chamber 2 to the carry-out chamber 3.
【0029】以上、本発明の一実施例に付き述べたが、
本発明は既述の実施例に限定されるものではなく、本発
明の技術的思想に基づいて各種の変形及び変更が可能で
ある。例えば、既述の実施例では、搬入室2側のエキゾ
ースト機構12を入口ドア及び出口ドア3が閉じた時点
t7 において開弁するようにしたが、その開弁時点をド
ア閉扉時点の後となるように設定してもよい。The above is a description of one embodiment of the present invention.
The present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention. For example, in the above-mentioned embodiment, the exhaust mechanism 12 on the side of the carry-in chamber 2 is opened at the time t 7 when the entrance door and the exit door 3 are closed, but the opening time is defined as after the door closing time. You may set so that it may become.
【0030】[0030]
【発明の効果】以上の如く、本発明は、搬入室の側に強
制開閉式のエキゾースト機構を設けると共に搬出室の側
には従来より用いられているような自動開放式のエキゾ
ースト機構を設け、炉本体の入口ドア及び出口ドアの閉
扉後に前記搬入室の側のエキゾースト機構を強制的に開
状態にすることにより、炉本体内での雰囲気ガスを搬入
室の側から搬出室に向う一方向に流すようにしたもので
あるから、カーボンポテンシャルの低い雰囲気ガスの流
れの停止或いは搬出室から搬入室の側への逆流を防止す
ることができる。その結果、被処理品の表面の酸化を防
ぐことができて外観のバラツキを低減できると共に、製
品の疲労強度に大きく影響する表面酸化層の低減を図る
ことができるので疲労強度の低下防止を図ることができ
る。As described above, according to the present invention, the forced opening / closing type exhaust mechanism is provided on the carry-in chamber side, and the automatic opening type exhaust mechanism as conventionally used is provided on the carry-out chamber side. After closing the inlet and outlet doors of the furnace body, by forcibly opening the exhaust mechanism on the side of the carry-in chamber, the atmospheric gas in the furnace body is moved in one direction from the side of the carry-in chamber to the carry-out chamber. Since it is designed to flow, it is possible to prevent the flow of the atmospheric gas having a low carbon potential from stopping or the backflow from the carry-out chamber to the carry-in chamber side. As a result, it is possible to prevent the oxidation of the surface of the object to be processed and reduce the variation in the appearance, and it is possible to reduce the surface oxide layer that greatly affects the fatigue strength of the product, so that it is possible to prevent the deterioration of fatigue strength. be able to.
【図1】本発明に係る雰囲気炉の側面図である。FIG. 1 is a side view of an atmospheric furnace according to the present invention.
【図2】前記雰囲気炉の平面図である。FIG. 2 is a plan view of the atmosphere furnace.
【図3】搬入室の側のエキゾースト機構の断面図であ
る。FIG. 3 is a sectional view of an exhaust mechanism on the side of a carry-in chamber.
【図4】搬出室の側のエキゾースト機構の断面図であ
る。FIG. 4 is a cross-sectional view of the exhaust mechanism on the side of the carry-out chamber.
【図5】前記雰囲気炉の動作を示すタイミングチャート
である。FIG. 5 is a timing chart showing the operation of the atmosphere furnace.
1 雰囲気炉(連続ガス浸炭炉) 2 入口ドア 3 出口ドア 4 炉本体 4a 炉室(加熱室) 5 搬入室 6 搬出室 7 油槽 9,9′ 被処理品(ワーク) 12 搬入室の側のエキゾースト機構 13 搬出室の側のエキゾースト機構 1 atmosphere furnace (continuous gas carburizing furnace) 2 inlet door 3 outlet door 4 furnace body 4a furnace chamber (heating chamber) 5 carry-in chamber 6 carry-out chamber 7 oil tank 9,9 'processed product (work) 12 exhaust on the side of the carry-in chamber Mechanism 13 Exhaust mechanism on the side of the unloading chamber
Claims (1)
設けられた入口ドアと出口ドアとを同時に開閉すること
により、被処理物を搬入室から前記炉本体内に搬入し、
かつ、前記炉本体内で加熱処理された別の被処理物を前
記炉本体内から搬出室に搬出するようにした雰囲気炉に
おいて、前記搬入室内の圧力とは無関係に強制開閉可能
なエキゾースト機構を前記搬入室に設けると共に、前記
搬出室内の圧力が所定の正圧になると自動的に開状態に
なるエキゾースト機構を前記搬出室に設け、前記入口ド
ア及び出口ドアの閉扉後に前記搬入室のエキゾースト機
構が強制的に開状態になるように構成し、これにより、
前記炉本体内での雰囲気ガスの流れを前記搬入室から前
記搬出室へ向かう方向になるようにしたことを特徴とす
る雰囲気炉。1. An object to be processed is carried into the furnace body from a carry-in chamber by simultaneously opening and closing an entrance door and an exit door provided on both sides of the furnace body filled with atmospheric gas.
And, in an atmosphere furnace in which another object to be heat-treated in the furnace body is carried out from the furnace body to the carry-out chamber, an exhaust mechanism that can be forcibly opened and closed regardless of the pressure in the carry-in chamber is provided. An exhaust mechanism, which is provided in the carry-in chamber and automatically opens when the pressure in the carry-out chamber reaches a predetermined positive pressure, is provided in the carry-out chamber, and the exhaust mechanism of the carry-in chamber is provided after closing the entrance door and the exit door. Is configured to be forced into the open state, which
An atmosphere furnace characterized in that a flow of an atmospheric gas in the furnace body is directed from the carry-in chamber to the carry-out chamber.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2178092A JPH05187777A (en) | 1992-01-10 | 1992-01-10 | Atmosphere furnace |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2178092A JPH05187777A (en) | 1992-01-10 | 1992-01-10 | Atmosphere furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH05187777A true JPH05187777A (en) | 1993-07-27 |
Family
ID=12064580
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2178092A Pending JPH05187777A (en) | 1992-01-10 | 1992-01-10 | Atmosphere furnace |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH05187777A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007216153A (en) * | 2006-02-17 | 2007-08-30 | Trinity Ind Corp | Ultraviolet coating curing equipment and coating curing method |
-
1992
- 1992-01-10 JP JP2178092A patent/JPH05187777A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007216153A (en) * | 2006-02-17 | 2007-08-30 | Trinity Ind Corp | Ultraviolet coating curing equipment and coating curing method |
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