【発明の詳細な説明】[Detailed description of the invention]
本発明は金属を酸化、脱炭的の表面変化を伴なうことな
（ｐ’、ＩＨ処即するＪｊｔ空熱処熟熱Ｉ炉に関するも
のである。
主加熱室と前室とを直列に配置して１！を熱動を前室内
で予熱してから主加熱室に移動させ半連続的に真空熱処
理できるようにした炉が既に実用化されている。即ち被
熱物を前室にて５００〜１００００Ｃに予熱してから主
加熱室に移動させることで生産性が向上できるようにし
たものであるが、従来のこのような半連続型真空熱処坩
１炉では、予熱が終った被熱物を前室から主加熱室に移
した後、該前室に新らたな被熱物を１ぐに装入すると該
前室の余熱によって核被熱動が加熱されることがら該前
室が真空排気されるよりも早く該被熱物の温度が上がっ
て被熱物を酸化さぜる虞れがカ・つた。
そのため前室が被熱物を酸化さぜない程の温度（例えば
２００”Ｃ）に下がるまで待ってから被熱物な装入する
ようにしなければならない場合があり、そのためにさら
なる生産性の向上を阻害していた。
本発明は上記欠点を解消し、真空熱処理炉の生産性を一
層向上させること、および省エネルギー化を目的をする
もので、その目的を達成するため、本発明は、前室内に
断熱祠によって囲った予熱スペースと、予熱前の被熱物
を一時待期させる時期スペースとを設けてなることを特
徴とし、予熱スペースの温度が高いときでも時期スペー
スに被熱物が装入できるようにしたものである。
次に本発明の一実施例を図面に従い説明１゛る。
図において、１は両端部に気密に中間扉２．３が設けら
れた主加熱室、４は該中間ｓ２を隔て主加熱室１と１ｕ
列に継がるように形成された前室、５は中間が３を隔て
前室４と反対側に形成された冷却室である。主加熱室ｌ
内には被熱物１が定置される固定台６が配置され、また
核被熱動ａを囲う如くに耐熱断熱性に優れた黒鉛製の断
熱材７が設けられ、該断６を月７の内側に電熱ヒータ８
が配置されている。９．１０は開時に中Ｊ）ｊｌ扉２．
３を夫々収納部１１．１２中に退避させるシリンダであ
る。
しかして前幸４内にけ予１５スペース１３と時期スペー
ス１４とが設けら第１、予熱スペース１３は固定台１５
上に置かれた被熱物ａを囲う如くに断熱材としてステン
レス鋼製の熱シールド板１６が設けられその内側に％’
、熱ヒータ１７が設けられている。１８は前室４の入口
扉、１９は冷却室５の出口扉で、入口扉摺。
１１：ｉ Ｄ Ｓ”、 １９けよもに自１１室４内、冷
却室６内を外部とは気密に閉塞できるようにしている。
２０．２１は被熱物ａを乗せるフォーク状の受具で、一
方の受具加は天井部に設けられたリフトレールρに沿っ
て前室４および主加熱室１中に進入し、他方の受具２The present invention relates to a JJT air heating maturation heating I furnace that processes metal without oxidizing or decarburizing surface changes (p', IH treatment).The main heating chamber and the front chamber are connected in series. Furnaces have already been put into practical use that allow for semi-continuous vacuum heat treatment by preheating the thermal components in the front chamber and then moving them to the main heating chamber. Productivity can be improved by preheating the crucible to 500 to 10,000C before moving it to the main heating chamber.However, in conventional semi-continuous vacuum heat treatment furnaces like this one, the After moving the heated material from the front chamber to the main heating chamber, if a new heated object is immediately charged into the front chamber, the nuclear heated movement will be heated by the residual heat in the front chamber. There was a risk that the temperature of the heated object would rise earlier than it was evacuated and oxidize the heated object.Therefore, the temperature of the front chamber was set at a temperature that would not oxidize the heated object (for example, 200°C). In some cases, it is necessary to wait until the temperature has dropped to "C) before charging the heated material, which hinders further productivity improvement. The present invention solves the above drawbacks and provides a vacuum heat treatment furnace The purpose of the present invention is to further improve productivity and save energy.To achieve this purpose, the present invention provides a preheating space surrounded by a heat insulating shrine in the front chamber and a temporary space for heating objects before preheating. The present invention is characterized in that a waiting space is provided, so that the object to be heated can be charged into the waiting space even when the temperature of the preheating space is high. In the figure, 1 is a main heating chamber with intermediate doors 2.3 airtightly provided at both ends, and 4 is a main heating chamber 1 and 1u separated by the intermediate door s2.
The front chambers 5 are formed so as to be continuous in rows, and the cooling chamber 5 is formed on the opposite side of the front chamber 4 with the middle space 3 in between. Main heating chamber l
A fixed table 6 on which the heated object 1 is placed is arranged inside, and a graphite heat insulating material 7 with excellent heat resistance and insulation properties is provided to surround the nuclear heated object a, Electric heater 8 inside
is located. 9.10 is inside J) jl door 2 when opened.
3 into storage portions 11 and 12, respectively. Therefore, a preheating space 13 and a heating space 14 are provided in the preheating space 4.
A heat shield plate 16 made of stainless steel is provided as a heat insulating material so as to surround the heated object a placed above.
, a thermal heater 17 is provided. 18 is the entrance door of the front chamber 4, 19 is the exit door of the cooling chamber 5, and is an entrance door slide. 11:i D S", 19 Keyomo, the inside of the room 4 and the inside of the cooling room 6 can be sealed airtight from the outside. 20. 21 is a fork-shaped receiver on which the heated object a is placed. Then, one of the receivers enters the front chamber 4 and the main heating chamber 1 along the lift rail ρ provided on the ceiling, and the other receiver 2 enters the front chamber 4 and the main heating chamber 1.
【
は同じく天井部に設けられたリフトレール幻に沿って冷
却室５および主加熱室１まで進入し得るように構成され
ている。なお、冴は受具加にて予熱スペース邦に搬入さ
れた被熱物ａを固定台】５上に降す際、および固定台塾
上の被熱物ａを再び受具田土に移す際に、計被熱動ａを
一時的に支持作動するシリンダ、また、部はシリンダＵ
と同じように被熱物ａを固定台６に移し替える際に作動
させるシリンダである。
このように構成された真空熱処理炉では、予熱スペース
塾にてＳＯＯ〜１ｏｏｏ＠ｃに予熱した被熱物ａを中間
！ｉ１２を開けて主加熱室１に移動し該被熱物ａをさら
に高温度に加熱する。そして該中間扉２を閉じた後に前
室４を復圧させ入口扉１８を開ければすぐにも次の？１
％物ａを前室４に装入することができる。即ち前室４に
装入した被熱物ａを時期スペース１４に位置させて入口
Ｊｉ１８を閉じ核前室４内を減圧し該前室４内が所要の
真空度になったところでこの被熱物色を予熱スペース１
３に移し替えるようにすれば、予熱スペース和か降温す
るのを待たなくても被熱物ａを酸化させることはない。
以」二矢施例について説明したように本発明の真空熱処
理炉は、前室内に予熱スペースと時期スペースを設けた
ために、予熱スペースの温度が下がらなくても新らたな
＃熱動を時期スペースに位置させてすぐにも該前室内を
減圧できるために処理能力が高くなり生産性を著しく向
上させる。また予−をスペースの余熱を次の被熱物な予
熱するのに利用できるため省エネルギー効果もあるなど
有益なものである。
グ 図面のｆｆｉ’ｉ月為な税、明
図面は本発明の一ツ３旙例を示した真空熱処理炉の粁′
Ｃ断面図である。
１・・・・主加熱室、４・・・・前室、 １３・自・予
熱スペース、１４・・・・時期スペース、 １６・・・
・り九シールド板。
１７・・−・ηΣ電熱ヒータａ・・・・被熱物。[
The cooling chamber 5 and the main heating chamber 1 can be accessed along a lift rail provided on the ceiling. In addition, Sae is used when lowering the heated object a brought into the preheating space onto the fixed table 5 using the receiver, and when transferring the heated object a on the fixed table to the receiver field again. , a cylinder that temporarily supports and operates the measured thermal movement a, and part is a cylinder U
This is a cylinder that is operated when transferring the object to be heated a to the fixing table 6 in the same way. In the vacuum heat treatment furnace configured in this way, the object to be heated a, which has been preheated to SOO~1ooo@c in the preheating space school, is placed in the middle! i12 is opened and moved to the main heating chamber 1, where the object to be heated a is further heated to a higher temperature. After closing the intermediate door 2, the pressure in the front chamber 4 is restored and the entrance door 18 is opened. 1
%a can be charged into the antechamber 4. That is, the heated object a charged into the front chamber 4 is positioned in the space 14, the inlet Ji 18 is closed, the pressure inside the nuclear front chamber 4 is reduced, and when the inside of the front chamber 4 reaches the required degree of vacuum, the heated object is removed. Preheat space 1
3, the object to be heated (a) will not be oxidized without waiting for the preheating space to cool down. As explained in the following example, the vacuum heat treatment furnace of the present invention has a preheating space and a timing space in the front chamber, so even if the temperature in the preheating space does not drop, new #thermal movement can be started at the timing. Since the pressure inside the front chamber can be reduced immediately after being placed in the space, processing capacity is increased and productivity is significantly improved. Furthermore, since the residual heat in the preheating space can be used to preheat the next object to be heated, it is advantageous in that it has an energy saving effect. The detailed drawings are of a vacuum heat treatment furnace showing one example of the present invention.
It is a sectional view of C. 1...Main heating chamber, 4...Ante chamber, 13.Self/preheating space, 14...Time space, 16...
・Riku shield board. 17... ηΣElectric heater a... Heated object.