JPS63262455A - Vacuum carburization furnace and its operating method - Google Patents
Vacuum carburization furnace and its operating methodInfo
- Publication number
- JPS63262455A JPS63262455A JP9833887A JP9833887A JPS63262455A JP S63262455 A JPS63262455 A JP S63262455A JP 9833887 A JP9833887 A JP 9833887A JP 9833887 A JP9833887 A JP 9833887A JP S63262455 A JPS63262455 A JP S63262455A
- Authority
- JP
- Japan
- Prior art keywords
- heated
- heating chamber
- vacuum
- door
- chamber
- 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
Links
- 238000011017 operating method Methods 0.000 title description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 98
- 238000001816 cooling Methods 0.000 claims abstract description 79
- 238000005255 carburizing Methods 0.000 claims abstract description 52
- 239000011261 inert gas Substances 0.000 claims abstract description 27
- 239000000463 material Substances 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 19
- 238000010791 quenching Methods 0.000 claims description 16
- 230000000171 quenching effect Effects 0.000 claims description 14
- 239000011810 insulating material Substances 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 25
- 229910001873 dinitrogen Inorganic materials 0.000 description 17
- 230000007246 mechanism Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000599 Cr alloy Inorganic materials 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
- 210000004369 blood Anatomy 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000000788 chromium alloy Substances 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分針〉
本発明は、加熱室と冷却室との２室からなり浸炭処理を
行なう半連続式の真空浸炭炉とその操業方法に間する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Minute Hand> The present invention relates to a semi-continuous vacuum carburizing furnace which is comprised of two chambers, a heating chamber and a cooling chamber, and performs carburizing treatment, and a method of operating the same.
〈従来の技術〉
従来、この種の加熱室と冷却室の２室からなる真空浸炭
炉では、第２図に示す特開昭５８−１３０２７０号公報
に記載されているものがある。<Prior Art> Conventionally, a vacuum carburizing furnace of this type consisting of two chambers, a heating chamber and a cooling chamber, is described in Japanese Patent Application Laid-Open No. 130270/1985 as shown in FIG.
この真空浸炭炉１は、加熱室２が高温環境の真空中およ
び大気中において化学的・強度的に安定な発熱体２ａお
よび断熱材２ｂから構成されるとともに、加熱室またび
油槽３ａを備えた冷却Ｎ３が真空容器４で覆われ、加熱
室２と冷却室３とには共に真空排気源Ｖが接続されてい
る。また、加熱室２には浸炭ガス源Ｃ９冷却Ｎ３には冷
却室３内を大気圧以上に加圧可能な窒素ガス等の不活性
ガス源Ｇがそれぞれ接続されている。This vacuum carburizing furnace 1 has a heating chamber 2 composed of a heating element 2a and a heat insulating material 2b that are chemically and mechanically stable in high-temperature environments such as vacuum and air, and is equipped with a heating chamber and an oil tank 3a. The cooling N3 is covered with a vacuum container 4, and a vacuum exhaust source V is connected to both the heating chamber 2 and the cooling chamber 3. Further, a carburizing gas source C9 is connected to the heating chamber 2, and an inert gas source G such as nitrogen gas capable of pressurizing the inside of the cooling chamber 3 to atmospheric pressure or higher is connected to the cooling N3.
なお、５は装入扉、６は中間真空扉、７は搬出扉、８は
内部移送装置、９は昇降台であり、さらに、５ａは内部
装入ｉ、６ａは内部中間扉であるこの真空浸炭炉ｌの操
業について述べると、っぎのようである（第１表参照）
。In addition, 5 is a charging door, 6 is an intermediate vacuum door, 7 is an unloading door, 8 is an internal transfer device, 9 is a lifting platform, 5a is an internal charging i, and 6a is an internal intermediate door. The operation of the carburizing furnace is as follows (see Table 1).
.
まず、予め加熱室２を大気圧状態で所定の温度に加熱し
ておく。First, the heating chamber 2 is heated in advance to a predetermined temperature under atmospheric pressure.
第１工程・・・装入扉５・５ａを開放し、第１被熱物Ｍ
１を加熱室２に装入し、直ちに装入扉５・５ａを閉鎖す
る。1st step: Open the charging door 5, 5a, and open the first heated object M.
1 into the heating chamber 2, and immediately close the charging doors 5 and 5a.
第２工程・・・加熱室２を真空排気源Ｖによって真空排
気しながら、第１被熱物Ｍ１を所定温度まで真空加熱し
、その後、浸炭ガス源Ｃによって所定の浸炭処理をする
。そして再び真空にし拡散処理をし、さらに焼入温度ま
で降温均熱加熱する。なお、その間に冷却室３を真空排
気しておく。Second step: While the heating chamber 2 is evacuated by the evacuation source V, the first object to be heated M1 is vacuum heated to a predetermined temperature, and then a predetermined carburizing process is performed using the carburizing gas source C. Then, the material is evacuated again and subjected to diffusion treatment, and then the temperature is lowered and soaked to the quenching temperature. Meanwhile, the cooling chamber 3 is evacuated.
第３工程・・・中間真空扉６・６ａを開放し、内部移送
装置８によって被熱物Ｍ１を冷却室３の昇降台９に移送
し、直ちに中間真空扉６・６ａを閉鎖する。Third step: The intermediate vacuum doors 6 and 6a are opened, the object to be heated M1 is transferred to the lifting platform 9 of the cooling chamber 3 by the internal transfer device 8, and the intermediate vacuum doors 6 and 6a are immediately closed.
第４工程・・・不活性ガス源Ｇからのガスを供給して冷
却室３を大゛気圧以上に加圧しつつ、昇降台９を降下さ
せて第１被熱物Ｍ１を焼入処理する。その間に、高温の
加熱室２へ空気を導入して大気圧状態とし、さらに、装
入扉５・５ａを開放して加熱室２に第２被熱物Ｍ２を装
入し、直ちに装入扉５・５ａを閉鎖する。なお、冷却室
３を大気圧以上に加圧する理由は、加熱室２内に空気が
入り込む際その空気が冷却室３内に入り込まないように
するためである。Fourth step: While supplying gas from the inert gas source G to pressurize the cooling chamber 3 to a high pressure or higher, the elevator platform 9 is lowered to quench the first object to be heated M1. In the meantime, air is introduced into the high-temperature heating chamber 2 to bring it to atmospheric pressure, and the charging doors 5 and 5a are opened to charge the second object to be heated M2 into the heating chamber 2, and immediately the charging door is opened. Close 5.5a. The reason why the cooling chamber 3 is pressurized above atmospheric pressure is to prevent the air from entering the cooling chamber 3 when air enters the heating chamber 2 .
第５工程・・・昇降台９を上昇させ、搬出５ｉ１７を開
放して第１被熱物Ｍ１を炉ｉ外へ搬出し、直ちに搬出扉
７を閉鎖して冷却室３を真空排気する。その間に、第２
被熱物Ｍ２を第２工程と同様に取扱う。Fifth step: The lifting table 9 is raised, the carry-out 5i17 is opened, the first object to be heated M1 is carried out of the furnace i, and the carry-out door 7 is immediately closed to evacuate the cooling chamber 3. In the meantime, the second
The object to be heated M2 is handled in the same manner as in the second step.
以下、定常状態では、第３・４・５工程が繰り返される
。Thereafter, in the steady state, the third, fourth, and fifth steps are repeated.
〈発明が解決しようとする問題点〉
従来の真空浸炭炉１は、被熱物Ｍ１・Ｍ２の加熱室２へ
の装入時、加熱室２を大気中にさらすことから、浸炭処
理中に発熱体１ａや断熱材１ｂに付着する煤を焼除する
ことができ、加熱Ｍ２内を清浄化することに効果がある
。<Problems to be Solved by the Invention> The conventional vacuum carburizing furnace 1 exposes the heating chamber 2 to the atmosphere when the objects to be heated M1 and M2 are charged into the heating chamber 2, so that heat is generated during the carburizing process. The soot adhering to the body 1a and the heat insulating material 1b can be burned off, which is effective in cleaning the inside of the heating M2.
しかし、従来の真空浸炭炉１では、加熱室２から冷却室
３へ被熱物Ｍを移送する際、被熱物Ｍを酸化させないよ
う、冷却Ｎ３を真空にしており、加熱室２ばかりでなく
冷却室３も真空構造にする必要がある。そのため、浸炭
処理に不可欠な油焼入の油槽３ａを備えた大ぎな容積の
冷却室３も真空構造にする必要が生じ、種々の高強度の
外壁や真空シール材を備えた大きな真空容器４が必要と
なり、組付工数及びコストがかかる。However, in the conventional vacuum carburizing furnace 1, when transferring the heated material M from the heating chamber 2 to the cooling chamber 3, the cooling N3 is evacuated to prevent the heated material M from being oxidized. The cooling chamber 3 also needs to have a vacuum structure. Therefore, the cooling chamber 3, which has a large capacity and is equipped with an oil tank 3a for oil quenching, which is essential for the carburizing process, also needs to have a vacuum structure. This requires additional assembly man-hours and costs.
そしてまた、加熱室２から冷却室３への被熱物Ｍの移送
を真空状態で行なうことから、内部移送装置８や中間真
空扉６・６ａの駆動装置を真空容器４内に配設する必要
が生じ、この種の駆動装置を特殊な機構や部品で構成し
“なければならず、上記問題を助長してしまう。Furthermore, since the object to be heated M is transferred from the heating chamber 2 to the cooling chamber 3 in a vacuum state, it is necessary to arrange the internal transfer device 8 and the driving device for the intermediate vacuum doors 6 and 6a inside the vacuum container 4. As a result, this type of drive device must be constructed with special mechanisms and parts, which exacerbates the above problems.
本発明は、上述の問題を解決するもので、被熱物の処理
に支障をきたすことなく、組付工数及゛びコストを低減
できる真空浸炭炉とその操業方法を提供することを目的
とする。The present invention solves the above-mentioned problems, and aims to provide a vacuum carburizing furnace and its operating method that can reduce assembly man-hours and costs without causing any hindrance to the treatment of objects to be heated. .
く問題点を解決するための手段〉
本発明に係る真空浸炭炉は、加熱室と冷却室との２室か
らなる真空浸炭炉であって、
加熱室が、高温環境の真空中及び大気中において化学的
・強度的に安定な発熱体及び断熱材から形成され、前部
に被熱物装入用の装入扉を備えるとともに後部に被熱物
搬出用の中間真空扉を備え、さらに真空排気源、浸炭ガ
ス源、及び不活性ガス源を接続させ、
冷却室が、中間真空扉を介して前部を加熱室に接続させ
、内部に油槽を備えるとともに後部に被熱物搬出用の搬
出扉を備え、さらに不活性ガス源を接続させ、
加熱室のみが真空容器に覆われている、ことを特徴とす
るものである。Means for Solving Problems> The vacuum carburizing furnace according to the present invention is a vacuum carburizing furnace consisting of two chambers, a heating chamber and a cooling chamber. It is made of a chemically and mechanically stable heating element and heat insulating material, and is equipped with a charging door for charging heated objects at the front, an intermediate vacuum door for removing heated objects at the rear, and a vacuum exhaust system. The cooling chamber is connected to the heating chamber at the front through an intermediate vacuum door, has an oil tank inside, and has an exit door at the rear for transporting heated materials. It is characterized in that it is equipped with an inert gas source, and that only the heating chamber is covered with a vacuum container.
また、本発明に係る真空浸炭炉の操業方法は、予め加熱
室を大気圧状態で所定温度に加熱しておくとともに、冷
却室を不活性ガスの供給により常時大気圧状態の不活性
ガス雰囲気としておぎ、下記第１〜５工程を行なうこと
を特徴とするものである。Further, in the method of operating the vacuum carburizing furnace according to the present invention, the heating chamber is heated in advance to a predetermined temperature at atmospheric pressure, and the cooling chamber is constantly maintained in an inert gas atmosphere at atmospheric pressure by supplying inert gas. It is characterized by performing the following steps 1 to 5.
■第１工程
装入扉を開放して第１被熱物を加熱室へ装入し、装入扉
を閉鎖する。■First step The charging door is opened, the first object to be heated is charged into the heating chamber, and the charging door is closed.
■第２工程
加熱室において第１被熱物を真空加熱し、その後、第１
被熱物を浸炭、拡散、及び昇温均熱加熱する。■Second step The first object to be heated is vacuum heated in the heating chamber, and then the first object is heated in a vacuum.
The object to be heated is carburized, diffused, and heated by soaking.
■第３工程
加熱室を不活性ガスの供給により大気圧状態として中間
真空扉を開放し、第１被熱物を大気圧状態の不活性ガス
雰囲気に保たれた冷却室へ８送し、その後、中間真空扉
を閉鎖する。■Third step: Bring the heating chamber to atmospheric pressure by supplying inert gas, open the intermediate vacuum door, send the first object to be heated to the cooling chamber maintained in an inert gas atmosphere at atmospheric pressure, and then , close the intermediate vacuum door.
■第４工程
第１被熱物な油焼入するとともに、装入扉を開放して第
２被熱物を加熱室へ装入し、その後、装入扉な閉鎖する
。(4) The first object to be heated is oil quenched, the charging door is opened and the second object to be heated is charged into the heating chamber, and then the charging door is closed.
■第５工程
搬出扉を開放して油焼入した第１被熱物を冷却室から搬
出し、その後、搬出扉を閉鎖し、その間に後続の第２被
熱物を前記第２工程以降で処理する。■Fifth step The carry-out door is opened and the oil-quenched first heat object is carried out from the cooling chamber, and then the carry-out door is closed. During this time, the subsequent second heat object is carried out in the second and subsequent steps. Process.
〈発明の作用・効果〉
本発明に係る真空浸炭炉とその操業方法では、被熱物の
加熱室から冷却室への移送時、加熱室と冷却室とが共に
大気圧状態の不活性ガス雰囲気になっていることから、
被熱物が酸化されず支障なく移送される。そして、被熱
物は、冷却室において大気圧状態の不活性ガス雰囲気で
油焼入され、その後炉外へ搬出されることとなり、支障
なく所定の浸炭処理が施される。<Operations and Effects of the Invention> In the vacuum carburizing furnace and its operating method according to the present invention, when the object to be heated is transferred from the heating chamber to the cooling chamber, both the heating chamber and the cooling chamber are in an inert gas atmosphere at atmospheric pressure. Since it is,
The object to be heated is not oxidized and can be transferred without any trouble. Then, the object to be heated is oil-quenched in an inert gas atmosphere at atmospheric pressure in the cooling chamber, and then transported out of the furnace, where it is subjected to a predetermined carburizing treatment without any trouble.
すなわち、本発明では、加熱室だけを真空容器で覆い、
冷却室を常時不活性ガスの供給によって大気圧状態の不
活性ガス雰囲気としておくだけでよく、冷却室を真空容
器で覆うような真空構造にすることが不要となる。That is, in the present invention, only the heating chamber is covered with a vacuum container,
It is sufficient to keep the cooling chamber in an inert gas atmosphere at atmospheric pressure by constantly supplying an inert gas, and there is no need to create a vacuum structure in which the cooling chamber is covered with a vacuum container.
そのため、大台な容積の冷却室を高価な真空構造としな
くともよいことから、従来必要であった大ぎな真空容器
でなくともよく、真空浸炭炉の組付工数及びコストを低
減させることができる。Therefore, there is no need for a cooling chamber with a large capacity to have an expensive vacuum structure, so there is no need for a large vacuum container that was previously required, and the man-hours and cost for assembling a vacuum carburizing furnace can be reduced. .
また、炉内での被熱物の移送手段や中間真空扉の駆動装
置を従来のような真空容器内に配設する必要がないこと
から、これらの装置を特殊なものでなく通常の機構の市
販品で構成することができ、炉の組付工数及びコストの
低減を助長できる。In addition, since there is no need to install the means for transferring heated materials in the furnace and the driving device for the intermediate vacuum door inside the vacuum container as in the past, these devices can be constructed using ordinary mechanisms rather than special ones. It can be constructed from commercially available products, and can help reduce furnace assembly man-hours and costs.
特に、冷却室に不活性ガスを常時大気□圧状態で供給し
ていることから、炉内での被熱物の移送時、搬出扉や中
間真空扉を開け、冷却室側の炉外に配置する移送手段を
介して被熱物を移送できるように構成すれば、炉内に被
熱物の移送手段を配設しなくともよく、一層真空浸炭炉
の組付工数及びコストを低減させることができ、また移
送手段の保守点検も容易となる。In particular, since inert gas is constantly supplied to the cooling chamber at atmospheric pressure, when transferring heated objects in the furnace, the unloading door and intermediate vacuum door are opened and the gas is placed outside the furnace on the cooling chamber side. If the material to be heated is configured to be able to be transferred through the transfer means, there is no need to provide a means for transferring the object to be heated in the furnace, and the man-hours and costs for assembling the vacuum carburizing furnace can be further reduced. This also facilitates maintenance and inspection of the transport means.
以上のように、本発明に係る真空浸炭炉とその操業方法
では、従来必要であった種々の構造・機構等を被熱物の
処理に支障をきたすことなく簡略化する己とができ、炉
の組付工数及びコストを著しく低減することができる。As described above, the vacuum carburizing furnace and its operating method according to the present invention can simplify the various structures and mechanisms that were conventionally necessary without causing any problems in the treatment of the objects to be heated. Assembling man-hours and costs can be significantly reduced.
また、本発明に係る真空浸炭炉では、常時加熱室及び冷
却室の炉内に浸炭ガスを供給するガス浸炭炉と相違し、
加熱室での浸炭処理時のみに浸炭ガスが供給されること
から、ガス浸炭炉のように爆発の危険性もない。In addition, the vacuum carburizing furnace according to the present invention is different from a gas carburizing furnace in which carburizing gas is constantly supplied into the heating chamber and cooling chamber,
Since carburizing gas is supplied only during the carburizing process in the heating chamber, there is no danger of explosion unlike in gas carburizing furnaces.
〈実ｔＪｔ！４例〉 以下、本発明の一実施例を図面に基づいて説明する。<Actual tJt! 4 cases> Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図に示す実施例の真空浸炭炉１）は、加熱室１２と
冷却室１３との２室から４＋’ａ成され、加熱室１２だ
けが真空容器１４に覆われている。The vacuum carburizing furnace 1) of the embodiment shown in FIG.
加熱室１２は、真空客器１４内に断熱材１２ｂと発熱体
１２ａを配設させて構成されている。The heating chamber 12 is configured by disposing a heat insulating material 12b and a heating element 12a inside the vacuum chamber 14.
発熱体１２ａは、高温強度が大で、高温状態で直接空気
に触れても酸化燃焼せず、また熱亀裂が生じなくて、高
温真空時でも蒸発しない抵抗発熱体を使用する。例えば
再結晶処理を施した炭化ケイ素系発熱体、またはその表
面にアルミナ溶射被覆層を形成させたもの、あるいは、
最高加熱温度が’１０００℃以下、真空圧０．２ト一ル
程度ならばニッケル・クロム系合金発熱体、鉄・クロム
系合金発熱体などが使用できる。As the heating element 12a, a resistance heating element is used which has high high-temperature strength, does not oxidize and burn when directly exposed to air at high temperatures, does not generate thermal cracks, and does not evaporate even in high-temperature vacuum conditions. For example, a silicon carbide heating element that has been subjected to recrystallization treatment, or one that has an alumina spray coating layer formed on its surface, or
If the maximum heating temperature is below 1,000°C and the vacuum pressure is about 0.2 torr, a nickel-chromium alloy heating element, an iron-chromium alloy heating element, etc. can be used.
断熱材１２ｂは、熱伝導率が小さく、高温状態、で繰返
し真空→大気にさらされても化学的に安定な耐火材、例
えば高純度セラミックファイバーで構成したものを使用
する。The heat insulating material 12b is made of a refractory material that has a low thermal conductivity and is chemically stable even when exposed repeatedly from vacuum to atmosphere at high temperatures, such as high-purity ceramic fiber.
そして、加熱室１２の前部（図中左側）には、被熱物Ｍ
装入用の装入扉１５が配設されている。In the front part of the heating chamber 12 (on the left side in the figure), there is a heated object M.
A charging door 15 for charging is provided.
この装入＃１５は、加熱室１２と真空容器１４との兼用
の扉であり、リンク機構１５トガイドレール１５２を介
して炉１）に配置される図示しない駆動装置によって上
下方向で開閉されるように構成されている。This charging #15 is a door that serves both the heating chamber 12 and the vacuum vessel 14, and is opened and closed in the vertical direction by a drive device (not shown) disposed in the furnace 1) via a link mechanism 15 and a guide rail 152. It is configured as follows.
加熱室１２の後部（図中右側）には、被熱物Ｍ搬出用の
中間真空５ｉ１）６が配設されている。この中間真空５
ｉ１）６は、装入ｍｔ５と同様に、加熱室１２と真空容
器１４との兼用の扉であり、リンク機構１６トガイドレ
ール１６２・チェーン１６３・スプロケット１６４を介
し、一方のスプロケット１６４の釉に接続される炉１）
外の図示しない駆動装置によって、上下方向で開閉され
るように構成されている。At the rear of the heating chamber 12 (on the right side in the figure), an intermediate vacuum 5i1) 6 for carrying out the object to be heated M is provided. This intermediate vacuum 5
i1) 6, like the charging mt5, is a door that serves both the heating chamber 12 and the vacuum container 14, and the link mechanism 16 is connected to the glaze of one sprocket 164 via the guide rail 162, chain 163, and sprocket 164. Furnace to be connected 1)
It is configured to be opened and closed in the vertical direction by an external drive device (not shown).
また、加熱室１２には、真空ポンプ等から構成される真
空排気源Ｖが真空弁２２を備えた管路２１を介して接続
されるとともに、浸炭ガス源Ｃが電磁弁２４及び流量調
整器２５を備えた管路２３を介して接続されている。さ
らに、加熱室１２には不活性ガスとしての窒素ガスを供
給する窒素ガス源Ｇが電磁弁２９を備える管路２８を介
して接続されている。Further, a vacuum exhaust source V composed of a vacuum pump or the like is connected to the heating chamber 12 via a conduit 21 equipped with a vacuum valve 22, and a carburizing gas source C is connected to a solenoid valve 24 and a flow rate regulator 25. It is connected via a conduit 23 provided with. Furthermore, a nitrogen gas source G that supplies nitrogen gas as an inert gas is connected to the heating chamber 12 via a conduit 28 that includes a solenoid valve 29 .
なお、１８は炉床レール、２０は浸炭ガスを攪拌するフ
ァンである。Note that 18 is a hearth rail, and 20 is a fan that stirs the carburizing gas.
冷却室１３は、中間真空扉１６の部位で加熱室１２後部
に接続され、内部に油焼入を行なう油槽１３ａを備えて
いる。The cooling chamber 13 is connected to the rear part of the heating chamber 12 at the intermediate vacuum door 16, and has an oil tank 13a therein for performing oil quenching.
冷却室１３の後部（図中右側）には、被熱物Ｍ搬出用の
搬出扉１７が配設され、この搬出扉１フは、装入扉１５
と同様に、リンク機構１７トガイドレール１７２を介し
て炉１）外に配置される図示しない駆動装置によって上
下方向で開閉されるものである。At the rear of the cooling chamber 13 (on the right side in the figure), an ejection door 17 for ejecting the heated object M is provided.
Similarly, the link mechanism 17 is opened and closed in the vertical direction by a drive device (not shown) disposed outside the furnace 1) via the guide rail 172.
また、冷却室１３内を常時大気圧状態で窒素ガス雰囲気
とするよう、冷却室１３には、流Ｎ調整器３１を備える
管路３０を介して窒素ガス源Ｇが接続されている。ちな
みに、実施例の場合、炉１）の操業時には、冷却室１３
内が常時大気圧状態を維持できるよう、大気圧より若干
加圧（約２０ａｍ Ｈ２０） Ｌ／て窒素ガスを流出さ
せるものであるそして、この冷却室１３は、従来の冷却
室３のように操業時に真空状態を維持する必要がなく、
窒素ガス雰囲気の大気圧状態を維持できればよいため、
その外壁を高強度の構造にしたり、真空シール材等を利
用しなくともよい。Further, a nitrogen gas source G is connected to the cooling chamber 13 via a conduit 30 provided with a flow N regulator 31 so that the inside of the cooling chamber 13 is always maintained at atmospheric pressure and in a nitrogen gas atmosphere. Incidentally, in the case of the embodiment, when the furnace 1) is operated, the cooling chamber 13
The cooling chamber 13 is pressurized slightly above atmospheric pressure (approximately 20 am H20) to allow nitrogen gas to flow out so that atmospheric pressure can be maintained at all times. Sometimes there is no need to maintain a vacuum state,
Since it is sufficient to maintain the atmospheric pressure state of the nitrogen gas atmosphere,
It is not necessary to make the outer wall have a high-strength structure or to use a vacuum sealing material.
なお、１９は、被熱物Ｍの油ｉｆ＠ １３ ａへの没入
・引上げを行なう昇降台であり、冷却室１３外に設けら
れたエアシンリダ３４により駆動されるものである。３
２は、流量調整器３３を備えた窒素ガスの廃棄用管路で
ある。Note that 19 is a lifting platform for immersing and lifting the heated object M into the oil if@13a, and is driven by an air cylinder 34 provided outside the cooling chamber 13. 3
2 is a nitrogen gas disposal pipe provided with a flow rate regulator 33.
また、この炉１）の前方には、装入扉１５の位置に対応
して被熱物Ｍの装入用コンベヤ３５が配設され、炉１）
の後方には、搬出扉１７の位置に対応して被熱物Ｍの搬
出用コンベヤ３フが配設されている。Further, in front of this furnace 1), a conveyor 35 for charging the object to be heated M is disposed corresponding to the position of the charging door 15.
A conveyor 3 for carrying out the heated object M is disposed behind the conveyor 3 corresponding to the position of the carrying out door 17.
そして、装入用コンベヤ３５内には、装入扉１５解放時
装入用コンベヤ３５上の被熱物Ｍを加熱室１２内の炉床
レール１８上の所定位置に移送可能な押出ロッド３６が
設けられている。また、搬出用コンベヤ３７内には、先
端を冷却室１３内に挿入させ、中間真空Ｊ７ｉ１）６の
解放時に加熱室１２内の被熱物Ｍを冷却室１３内の昇降
台１９上に移送させたり、また、排出扉１７の解放時に
冷却室１３内の被熱物Ｍ、を炉１）外へ搬出させたりす
る引出ロッド３８が配設されている。Inside the charging conveyor 35, there is an extrusion rod 36 that can transfer the heated object M on the charging conveyor 35 to a predetermined position on the hearth rail 18 in the heating chamber 12 when the charging door 15 is released. It is provided. In addition, the tip of the conveyor 37 for carrying out is inserted into the cooling chamber 13, and when the intermediate vacuum J7i1) 6 is released, the heated object M in the heating chamber 12 is transferred onto the lifting platform 19 in the cooling chamber 13. In addition, a pull-out rod 38 is provided for carrying out the heated object M in the cooling chamber 13 to the outside of the furnace 1) when the discharge door 17 is opened.
なお、押出ロッド３６や引出ロッド３８は、被熱物Ｍの
移送時、上面に被熱物Ｍをそれぞれ載置させているパレ
ットＰを引掛け、このパレットＰを介して被熱物Ｍの移
送を行なうものである。In addition, when transferring the object to be heated M, the extrusion rod 36 and the pull-out rod 38 hook the pallet P on which the object to be heated M is placed on the upper surface, and transfer the object to be heated M via this pallet P. This is what we do.
つぎに、実施例の真空浸炭炉１）の操業について説明す
る（第２表参照）。Next, the operation of the vacuum carburizing furnace 1) of the example will be explained (see Table 2).
まず、予め、加熱室１２を大気圧状態で所定の温度に加
熱しておくとともに、流量調整器３１を調整して窒素ガ
ス源Ｇから冷却室１３内へ所定流量の窒素ガスを供給し
、冷却室！３内を大気圧状態の窒素ガス雰囲気としてお
く。なお、各界１５・１６・１７は閉鎖させておく。First, the heating chamber 12 is heated in advance to a predetermined temperature at atmospheric pressure, and the flow rate regulator 31 is adjusted to supply a predetermined flow rate of nitrogen gas from the nitrogen gas source G into the cooling chamber 13 for cooling. Room! 3 is kept in a nitrogen gas atmosphere at atmospheric pressure. Please note that all areas 15, 16, and 17 will be closed.
第１工程
装入扉１５を開放し、押出ロッド３６を使用して装入用
コンベヤ３５上の第１被熱物Ｍ１を炉床レール１８上の
所定位置に移送し、第１被熱物Ｍ１を加熱室１２へ装入
する。そして直ちに装入扉１５を閉鎖する。The first process charging door 15 is opened, the first heat target M1 on the charging conveyor 35 is transferred to a predetermined position on the hearth rail 18 using the push rod 36, and the first heat target M1 is transferred to a predetermined position on the hearth rail 18. is charged into the heating chamber 12. Then, the charging door 15 is immediately closed.
第２工程
電磁弁２２を開いて加熱室１２を真空状態に減圧すると
ともに、第１被熱物Ｍ１を所定の浸炭温度まで昇温均熱
加熱し、その後電磁弁２２を閉じる。The second step solenoid valve 22 is opened to reduce the pressure in the heating chamber 12 to a vacuum state, and the first object to be heated M1 is heated and soaked to a predetermined carburizing temperature, and then the solenoid valve 22 is closed.
そして、所定の浸炭温度を維持した状態で、電磁弁２４
を開いて加熱室１２内に浸炭ガスを所定流量で所定時間
併給し、′ｙ％１被熱物Ｍ１を浸炭する。Then, while maintaining the predetermined carburizing temperature, the solenoid valve 24
is opened and carburizing gas is simultaneously fed into the heating chamber 12 at a predetermined flow rate for a predetermined time to carburize the object to be heated M1.
その後、高温を維持した状態で、電磁弁２４を閉じると
ともに、再び電磁弁２２を開いて加熱室１２内を真空状
態とし、浸炭された第１被熱物Ｍ１の表層部の炭素の芯
部への拡散を行なう。Thereafter, while maintaining the high temperature, the solenoid valve 24 is closed, and the solenoid valve 22 is opened again to create a vacuum state in the heating chamber 12, and the carbon core in the surface layer of the carburized first object to be heated M1 is heated. to spread the information.
そしてその後、第１被熱物Ｍ１を油焼入に最適な温度と
なるよう降温均熱加熱する。Thereafter, the first object to be heated M1 is heated and soaked so as to reach the optimum temperature for oil quenching.
第３工程
電磁弁２２を閉じるとともに電磁弁２９を開き、加熱室
１２内に窒素ガスを供給して、加熱室１２を冷却室１３
と同様な大気圧状態の窒素ガス雰囲気とし、その後、中
間真空扉１６を開放する。Third step The solenoid valve 22 is closed and the solenoid valve 29 is opened to supply nitrogen gas into the heating chamber 12 and convert the heating chamber 12 into the cooling chamber 13.
After that, the intermediate vacuum door 16 is opened.
そして、引出ロッド３８を使用し、炉床レール１８上の
第１被熱物Ｍ１を昇降台１９上に移送して、第１被熱物
Ｍ１を冷却室１３へ移送し、その後、中間真空扉１６を
閉鎖する。ちなみに、この第１被熱物Ｍ１の移送時では
、加熱室１２と冷却室１３とが共に窒素ガス雰囲気とな
っていることから、第１被熱物Ｍ１は、酸化されること
がなく、支障なく移送される。Then, using the pull-out rod 38, the first heated object M1 on the hearth rail 18 is transferred onto the lifting platform 19, the first heated object M1 is transferred to the cooling chamber 13, and then the intermediate vacuum door 16 will be closed. Incidentally, during the transfer of the first heat target M1, both the heating chamber 12 and the cooling chamber 13 are in a nitrogen gas atmosphere, so the first heat target M1 is not oxidized and there is no problem. It will be transferred without any problem.
第４工程
エアシリンダ３４を作動させて昇降台１９を降下させ、
第１被熱物Ｍ１を油４ｉ １３ ａ内に投入して油焼入
する。Activating the fourth step air cylinder 34 to lower the lifting platform 19,
The first object to be heated M1 is put into oil 4i 13a and oil quenched.
これと同時に、装入扉１５を開放し、押出ロッド３６を
介して装入用コンベヤ３５上の後続の第２被熱物Ｍ２を
加熱室１２の炉床レール１８上の所定位置に装入し、そ
の後直ちに装入扉１５を閉鎖する。その際、加熱室１２
内には空気が流入することから、発熱体１２ａや断熱材
１２ｂに付着していた浸炭ガスの煤が焼除され、加熱室
１２内の清浄化が図れる。At the same time, the charging door 15 is opened, and the subsequent second heated object M2 on the charging conveyor 35 is charged into a predetermined position on the hearth rail 18 of the heating chamber 12 via the push rod 36. , and then immediately closes the charging door 15. At that time, heating chamber 12
Since air flows into the heating chamber 12, the soot of the carburizing gas adhering to the heating element 12a and the heat insulating material 12b is burned off, and the inside of the heating chamber 12 can be cleaned.
第５工程
エアシリンダ３４を介して油槽１３ａ中の昇降台１９及
び第１被熱物Ｍ１を上昇させて元の位置に戻す。そして
、搬出扉１７を開放し、引出ロッド３８を介して昇降台
１９上から搬出用コンベヤ３７上（第１被熱物Ｍ１を移
送し、第１被熱物Ｍ１を冷却室１３から撤出後、搬出５
ｉ１）７を閉鎖する、また、加熱室１２内では、第２工
程と同様に第２被熱物Ｍ２を処理する。Fifth step The lifting platform 19 and the first heated object M1 in the oil tank 13a are raised via the air cylinder 34 and returned to their original positions. Then, the unloading door 17 is opened, and the first heated object M1 is transferred from the elevator platform 19 to the unloading conveyor 37 via the pull-out rod 38, and after the first heated object M1 is removed from the cooling chamber 13. , unloading 5
i1) 7 is closed, and in the heating chamber 12, the second heat target M2 is processed in the same manner as in the second step.
その後、定常状態では、第３・４・５工程が繰り返され
る。Thereafter, in a steady state, the third, fourth, and fifth steps are repeated.
したがって、この実施例では、冷却室１３を真空状態と
しなくとも支障なく被熱物Ｍの処理が行なえることから
、既述の発明の作用・効果の欄で述べたと同様な効果を
奏する。Therefore, in this embodiment, the object to be heated M can be processed without any problem even if the cooling chamber 13 is not in a vacuum state, and therefore, the same effects as described in the section of the above-mentioned functions and effects of the invention are achieved.
そしてまた、この実施例では、可動する装入扉１５・中
間真空扉１６・搬出扉１７・昇降台１９・炉１）内での
被熱物Ｍ移送用の押出・引出ロッド３６・３８等が全て
真空容器１４内に配設されておらず、自動操業する場合
、各可動部品の位置確認用の検出センサを真空容器１４
外に配置させることができ、自動操業時の機構を単純化
でき、自動操業時のハード及びソフトの面で好都合とな
る。In addition, in this embodiment, movable charging door 15, intermediate vacuum door 16, unloading door 17, elevating table 19, extrusion/drawing rods 36, 38 for transferring heated material M in the furnace 1), etc. If all of the moving parts are not disposed inside the vacuum vessel 14 and automatic operation is required, a detection sensor for confirming the position of each moving part may be installed in the vacuum vessel 14.
It can be placed outside, simplifying the mechanism during automatic operation, and is advantageous in terms of hardware and software during automatic operation.
ちなみに、従来の炉１を自動操業させる場合には、真空
中で各種検出スイッチを作動させることがそれらの接点
の寿命を著しく短かくさせることから、各可動部品の位
置にカムやカムロッド等を配置させて、そのカムロッド
等の端部を真空容器外へ出し、その端部の動きを検出ス
イッチで検出するように構成する必要があり、複雑な機
構となっていた。By the way, when operating the conventional furnace 1 automatically, cams, cam rods, etc. are placed at the positions of each moving part because operating the various detection switches in a vacuum significantly shortens the life of their contacts. Then, the end of the cam rod or the like must be taken out of the vacuum vessel, and the movement of the end must be detected by a detection switch, resulting in a complicated mechanism.
なお、実施例では常時冷却室１３を大気圧状態の窒素ガ
ス雰囲気としておき、加熱室１２から冷却室１３への被
熱物Ｍの移送時、加熱室１２も大気圧状態の窒素ガス雰
囲気とし、モして被熱物Ｍを移送させるものを示した。In the embodiment, the cooling chamber 13 is always kept in a nitrogen gas atmosphere at atmospheric pressure, and when the object to be heated M is transferred from the heating chamber 12 to the cooling chamber 13, the heating chamber 12 is also kept in a nitrogen gas atmosphere at atmospheric pressure. The figure shows one for transporting the object to be heated M.
しかし、実施例の場合、加熱室１２から冷却室１３へ移
送して被熱物Ｍを油焼入するまでの時間が比較的短かい
ことから、酸化させても支障がない被熱物を浸炭処理す
る場合には、冷却室１３や加熱室１２内を窒素ガス雰囲
気としなくともよい、すなわち、浸炭処理後、ショツト
ブラスト装置でパリ取り作業を行なうような場合には、
被熱物Ｍ表面に薄い酸化膜が形成されても、その後のパ
リ取り作業中に光輝肌を得ることがでるからである。However, in the case of the example, since the time required to oil-quench the object M after transferring it from the heating chamber 12 to the cooling chamber 13 is relatively short, the object to be heated M can be carburized without any problem even if it is oxidized. When processing, it is not necessary to create a nitrogen gas atmosphere in the cooling chamber 13 or the heating chamber 12. In other words, when deburring is performed using a shot blasting device after carburizing,
This is because even if a thin oxide film is formed on the surface of the heated object M, a shiny skin can be obtained during the subsequent deburring operation.
第１表 従来の真空浸炭炉の工程 第２工程（第５工程）は 浸炭、拡散、ＩＡ埋も含む 第２表 発明した真空浸炭炉の工程Table 1: Conventional vacuum carburizing furnace process The second step (fifth step) is Includes carburizing, diffusion, and IA embedding. Table 2 Process of invented vacuum carburizing furnace
第１図は本発明の一実施例を示す真空浸炭炉の断面図、
第２図は従来の炉を示す断面図である。
１）・・・真空浸炭炉、
１２・・・加熱室、
１２ａ・・・発熱体、
１２ｂ・・・断熱材、
１３・・・冷却室、
１３ａ・・・油槽、
１４・・・真空容器、
１５・・・装入扉、
１６・・・中間真空扉、
１７・・・搬出扉、
Ｍ・・・被熱物、
■・・・真空排気源、
Ｃ・・・浸炭ガス源、
Ｇ・・・（不活性ガス源）窒素ガス源。
第２図
自 発 補 正
手続補正書
１、事件の表示
昭和６２年 特 許 願 第０９８３３８号２、発明の
名称
真空浸炭炉とその操業方法
３、補正をする者
事件との関係 特 許 出 願 人住所
氏 名 杉 山 道 生明細書の
「特許請求の範囲」及び「発明の詳細な説明」の各欄
（１）明細書の特許請求の範囲を別紙のとおり補正する
。
（２）明細書第６頁第９〜１０行ｒ・・・に不可欠な油
焼入の油槽３ａを備えた大きな・・・」を「・・・に不
可欠な焼入を行なう油槽３ａ等を備えた大きな・・・」
と補正する。
（３）同第７頁第１４行「・・・させ、内部に油槽を備
えるとともに・・・」を「・・・させ、内部に冷却手段
を備えるとともに」と補正する。
（４）同第８頁第１８行「第１被熱物を油焼入するとと
もに、・・・」を「第１被熱物を冷却手段により焼入す
るとともに、・・・」と補正する。
（５）同第９頁第２行「搬出扉を開放して油焼入した第
１・・・」を「搬出扉を開放して焼入した第１・・・」
と補正する。
（６）同第９頁第１２行「・・・の不活性ガス雰囲気で
油焼入され、」を「・・・の不活性ガス雰囲気で焼入さ
れ、」と補正する。
（７）同第１３頁第１５行「・・・に接続され、内部に
油焼入を行なう油槽」を「・・・に接続され、内部に焼
入を行なう冷却手段として油槽」と補正する（８）同第
１７頁第７行「・・・、第１被熱物Ｍ１を油焼入に最適
」を「・・・、第１被熱物Ｍ１を焼入に最適」と補正す
る。
（９）同第２０頁第１９行の次の行に次の文を挿入する
。
「また、実施例では、被熱物を焼入する冷却手段として
、油槽１３ａを利用するものを示したが、他に、水や水
溶性冷却剤等の焼入液、あるいはガス冷却や流動層冷却
等の周知の冷却手段を利用してもよい。」
２、特許請求の範囲
（１）加熱室と冷却室との２室からなる真空浸炭炉であ
って、
前記加熱室が、高温環境の真空中及び大気中において化
学的・強度的に安定な発熱体及び断熱材から形成され、
前部に被熱物装入用の装入扉を備えるとともに後部に被
熱物搬出用の中間真空扉を備え、さらに真空排気源、浸
炭ガス源、及び不活性ガス源を接続させ、
前記冷却室が、前記中間真空扉を介して前部を前記加熱
室に接続させ、内部に血工土上を備えるとともに後部゛
に被熱物搬出用の搬出扉を備え、さらに不活性ガス源を
接続させ、
前記加熱室のみが真空容器に覆われている、ことを特徴
とする真空浸炭炉。
（２）予め加熱室を大気圧状態で所定温度に加熱してお
くとともに、冷却室を不活性ガスの供給により常時大気
圧状態の不活性ガス雰囲気としておき、下記第１〜５工
程を行なうことを特徴とする真空浸炭炉の操業方法。
■第１工程
装入扉を開放して第１被熱物を加熱室へ装入し、装入扉
を閉鎖する。
■第２工程
加熱室において第１被熱物を真空加熱し、その後、第１
被熱物を浸炭、拡散、及び降温均熱加熱する。
■第３工程
加熱室を不活性ガスの供給により大気圧状態として中間
真空扉を開放し、第１被熱物を冷却室へ移送し、その後
、中間真空扉を閉鎖する。
■第４工程
第１被熱物を土工王旦且主ユ焼入するとともに、装入扉
を開放し、て第２被熱物を加熱室へ装入し、その後、装
入扉を閉鎖する。
■第５工程
搬出扉を開放し」大した第１被熱物な冷却室から搬出し
、その後、搬出扉を閉鎖し、その間に後続の第２被熱物
を第２工程以降で一理する。FIG. 1 is a sectional view of a vacuum carburizing furnace showing an embodiment of the present invention;
FIG. 2 is a sectional view showing a conventional furnace. 1)...Vacuum carburizing furnace, 12...Heating chamber, 12a...Heating element, 12b...Insulating material, 13...Cooling chamber, 13a...Oil tank, 14...Vacuum container, 15...Charging door, 16...Intermediate vacuum door, 17...Carrying out door, M...Heated object, ■...Vacuum exhaust source, C...Carburizing gas source, G...・(Inert gas source) Nitrogen gas source. Figure 2 Written amendment of voluntary amendment procedure 1, Indication of the case 1988 Patent application No. 098338 2, Name of the invention Vacuum carburizing furnace and its operating method 3, Relationship with the person making the amendment Patent application Person Address Name Michi Sugiyama Each column of "Claims" and "Detailed Description of the Invention" in the specification (1) The scope of claims in the specification will be amended as shown in the attached sheet. (2) Page 6 of the specification, lines 9-10 r...'' is changed from ``A large oil tank 3a equipped with an oil tank 3a for oil quenching essential for...'' to ``A large oil tank 3a etc. for quenching essential for... A big prepared...
and correct it. (3) In the 14th line of page 7, "... and equipped with an oil tank inside..." is amended to "... and equipped with a cooling means inside." (4) On page 8, line 18, "The first object to be heated is quenched with oil, and..." is amended to "The first object to be heated is quenched by a cooling means, and..." . (5) Page 9, line 2, “The first oil quenched with the loading door open” has been changed to “The first quenched with the loading door open”
and correct it. (6) On page 9, line 12, ``Oil quenched in an inert gas atmosphere of...'' is corrected to ``quenched in an inert gas atmosphere of...''. (7) On page 13, line 15, "an oil tank that is connected to... and performs oil quenching inside" is corrected to "an oil tank that is connected to... and serves as a cooling means to perform quenching on the inside." (8) On page 17, line 7, "..., the first heat target M1 is most suitable for oil quenching" is corrected to "..., the first heat target M1 is most suitable for quenching". (9) Insert the following sentence on the next line of page 20, line 19. ``In addition, in the embodiment, the oil tank 13a is used as a cooling means for quenching the object to be heated, but other methods include quenching liquid such as water or water-soluble coolant, gas cooling, and fluidized bed cooling means. A well-known cooling means such as cooling may be used.'' 2. Claims (1) A vacuum carburizing furnace consisting of two chambers, a heating chamber and a cooling chamber, wherein the heating chamber is in a high-temperature environment. Made from a heating element and heat insulating material that are chemically and mechanically stable in vacuum and air,
A charging door for charging the heated material is provided at the front, and an intermediate vacuum door for removing the heated material is provided at the rear, and a vacuum exhaust source, a carburizing gas source, and an inert gas source are connected to the cooling. The chamber has a front part connected to the heating chamber via the intermediate vacuum door, is provided with a blood-containing soil in the inside, is provided with an ejection door for carrying out the heated object in the rear part, and is further connected to an inert gas source. A vacuum carburizing furnace characterized in that only the heating chamber is covered with a vacuum container. (2) The heating chamber is preheated to a predetermined temperature at atmospheric pressure, and the cooling chamber is constantly maintained in an inert gas atmosphere at atmospheric pressure by supplying inert gas, and the following steps 1 to 5 are performed. A method of operating a vacuum carburizing furnace characterized by: ■First step The charging door is opened, the first object to be heated is charged into the heating chamber, and the charging door is closed. ■Second step The first object to be heated is vacuum heated in the heating chamber, and then the first object is heated in a vacuum.
The object to be heated is carburized, diffused, and heated by cooling and soaking. (3) Third step: Bring the heating chamber to atmospheric pressure by supplying inert gas, open the intermediate vacuum door, transfer the first object to be heated to the cooling chamber, and then close the intermediate vacuum door. ■Fourth step: While quenching the first object to be heated, open the charging door, charge the second object to be heated into the heating chamber, and then close the charging door. . ■The 5th process: Open the carry-out door and carry out the large 1st heated object from the cooling room. Then, close the carry-out door, and during this time, clean up the subsequent 2nd heated object in the 2nd process and beyond. .
Claims (2)
つて、 前記加熱室が、高温環境の真空中及び大気中において化
学的・強度的に安定な発熱体及び断熱材から形成され、
前部に被熱物装入用の装入扉を備えるとともに後部に被
熱物搬出用の中間真空扉を備え、さらに真空排気源、浸
炭ガス源、及び不活性ガス源を接続させ、 前記冷却室が、前記中間真空扉を介して前部を前記加熱
室に接続させ、内部に油槽を備えるとともに後部に被熱
物搬出用の搬出扉を備え、さらに不活性ガス源を接続さ
せ、 前記加熱室のみが真空容器に覆われている、ことを特徴
とする真空浸炭炉。(1) A vacuum carburizing furnace consisting of two chambers, a heating chamber and a cooling chamber, wherein the heating chamber is made of a heating element and a heat insulating material that are chemically and mechanically stable in high-temperature environments in vacuum and in the atmosphere. is,
A charging door for charging the heated material is provided at the front, and an intermediate vacuum door for removing the heated material is provided at the rear, and a vacuum exhaust source, a carburizing gas source, and an inert gas source are connected to the cooling. The chamber has a front part connected to the heating chamber via the intermediate vacuum door, has an oil tank inside, has an ejection door for carrying out the heated object at the rear part, and is further connected to an inert gas source, and is connected to the heating chamber. A vacuum carburizing furnace characterized in that only the chamber is covered with a vacuum container.
くとともに、冷却室を不活性ガスの供給により常時大気
圧状態の不活性ガス雰囲気としておき、下記第１〜５工
程を行なうことを特徴とする真空浸炭炉の操業方法。 ［１］第１工程 装入扉を開放して第１被熱物を加熱室へ装入し、装入扉
を閉鎖する。 ［２］第２工程 加熱室において第１被熱物を真空加熱し、その後、第１
被熱物を浸炭、拡散、及び降温均熱加熱する。 ［３］第３工程 加熱室を不活性ガスの供給により大気圧状態として中間
真空扉を開放し、第１被熱物を冷却室へ移送し、その後
、中間真空扉を閉鎖する。 ［４］第４工程 第１被熱物を油焼入するとともに、装入扉を開放して第
２被熱物を加熱室へ装入し、その後、装入扉を閉鎖する
。 ［５］第５工程 搬出扉を開放して油焼入した第１被熱物を冷却室から搬
出し、その後、搬出扉を閉鎖し、その間に後続の第２被
熱物を第２工程以降で処理する。(2) The heating chamber is preheated to a predetermined temperature at atmospheric pressure, and the cooling chamber is constantly maintained in an inert gas atmosphere at atmospheric pressure by supplying inert gas, and the following steps 1 to 5 are performed. A method of operating a vacuum carburizing furnace characterized by: [1] First step The charging door is opened, the first object to be heated is charged into the heating chamber, and the charging door is closed. [2] The first heat target is vacuum heated in the second step heating chamber, and then the first
The object to be heated is carburized, diffused, and heated by cooling and soaking. [3] Third step: Bring the heating chamber to atmospheric pressure by supplying inert gas, open the intermediate vacuum door, transfer the first object to be heated to the cooling chamber, and then close the intermediate vacuum door. [4] Fourth step: While oil quenching the first object to be heated, the charging door is opened and the second object to be heated is charged into the heating chamber, and then the charging door is closed. [5] Open the 5th process carry-out door and carry out the oil-quenched first heated object from the cooling chamber, then close the carry-out door, and in the meantime, carry out the subsequent 2nd heated object from the 2nd process onward. Process with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9833887A JPS63262455A (en) | 1987-04-21 | 1987-04-21 | Vacuum carburization furnace and its operating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9833887A JPS63262455A (en) | 1987-04-21 | 1987-04-21 | Vacuum carburization furnace and its operating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63262455A true JPS63262455A (en) | 1988-10-28 |
| JPH0514025B2 JPH0514025B2 (en) | 1993-02-24 |
Family
ID=14217117
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9833887A Granted JPS63262455A (en) | 1987-04-21 | 1987-04-21 | Vacuum carburization furnace and its operating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63262455A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100599256B1 (en) * | 2004-10-11 | 2006-07-18 | 동우열처리공업 주식회사 | Gas carburization heat treatment furnace with integral salt bath |
| JP2007127350A (en) * | 2005-11-04 | 2007-05-24 | Nachi Fujikoshi Corp | Small vacuum carburizing furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60141822A (en) * | 1983-12-28 | 1985-07-26 | Chugai Ro Kogyo Kaisha Ltd | Atmosphere heat treating furnace provided with vacuum vestibule |
| JPS6194550U (en) * | 1984-11-26 | 1986-06-18 |
-
1987
- 1987-04-21 JP JP9833887A patent/JPS63262455A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60141822A (en) * | 1983-12-28 | 1985-07-26 | Chugai Ro Kogyo Kaisha Ltd | Atmosphere heat treating furnace provided with vacuum vestibule |
| JPS6194550U (en) * | 1984-11-26 | 1986-06-18 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100599256B1 (en) * | 2004-10-11 | 2006-07-18 | 동우열처리공업 주식회사 | Gas carburization heat treatment furnace with integral salt bath |
| JP2007127350A (en) * | 2005-11-04 | 2007-05-24 | Nachi Fujikoshi Corp | Small vacuum carburizing furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0514025B2 (en) | 1993-02-24 |
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