JPS60262913A - Method for introducing gas in forced-convection cooling - Google Patents
Method for introducing gas in forced-convection coolingInfo
- Publication number
- JPS60262913A JPS60262913A JP11945384A JP11945384A JPS60262913A JP S60262913 A JPS60262913 A JP S60262913A JP 11945384 A JP11945384 A JP 11945384A JP 11945384 A JP11945384 A JP 11945384A JP S60262913 A JPS60262913 A JP S60262913A
- Authority
- JP
- Japan
- Prior art keywords
- cooling
- gaseous refrigerant
- heat
- pressure
- gas
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
- C21D1/767—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material with forced gas circulation; Reheating thereof
Abstract
Description
【発明の詳細な説明】 この発明は強制対流冷却のガス導入方法に関する。[Detailed description of the invention] This invention relates to a gas introduction method for forced convection cooling.
更に詳しくは真空熱処理炉等に、おいて用いる強制対流
冷却用ガスの導入方法に関する。More specifically, the present invention relates to a method for introducing forced convection cooling gas into a vacuum heat treatment furnace or the like.
従来、鯛〇熱処理等を行う真空熱処理炉において、鋼の
焼入れを行う際に、冷媒ガスを大気圧以上に、ある所定
圧力化導入して強制冷却を行う。この場合従来は冷却の
始めから終り迄、ガス圧力を一定に保つため冷却の途中
で間欠的に冷媒ガスを追加導入している。Conventionally, when quenching steel in a vacuum heat treatment furnace that performs sea bream heat treatment, etc., forced cooling is performed by introducing refrigerant gas at a certain predetermined pressure above atmospheric pressure. In this case, conventionally, additional refrigerant gas is intermittently introduced during cooling in order to keep the gas pressure constant from the beginning to the end of cooling.
これは冷却くより同ガスが双璧して圧力が低下するのを
補うためである。This is to compensate for the drop in pressure caused by the gas becoming more concentrated due to cooling.
一般に上記強制対流冷却の速度はガス圧の約０１剰に比
例して増大する。そして最近に至り高速対流冷却が可能
な真空熱処理炉が要求されており、７〜８年以前迄は冷
媒ガスの圧力は約０９パール程度であったが、３〜４年
前に＃１．５〜２、ｇ ｓ−ルと２９．最近に至って３
１５パールの圧力で高速対流冷却のできる真空熱処理炉
が現れるに至った。Generally, the rate of forced convection cooling increases approximately in proportion to the gas pressure. Recently, vacuum heat treatment furnaces capable of high-speed convection cooling have been required, and until 7 or 8 years ago, the refrigerant gas pressure was about 0.9 par, but 3 or 4 years ago, the pressure of the refrigerant gas was about 0.9 par. ~2, g s-le and 29. Recently 3
A vacuum heat treatment furnace capable of high-speed convection cooling at a pressure of 15 pars has appeared.
従って上記真空熱処理ＰＫお−て冷却が終った場合、前
記炉内には低温で例えば５パール等の設定圧力のガスが
存在することＫなる。そして焼入れだ講等を炉外に取出
すために上記設定圧力のガスを大が中に放出し【、炉内
圧力χ大気圧迄下げる必要がある。即ちここに冷媒ガス
χ大量に廃棄することになり、冷媒ガスの消費檄の多さ
が開運となる。このため前記冷媒ガスｔできる限り粛約
することが要望される。Therefore, when cooling is completed after the vacuum heat treatment, gas exists in the furnace at a low temperature and a set pressure of, for example, 5 par. Then, in order to take out the hardened steel etc. from the furnace, it is necessary to release the gas at the above-mentioned set pressure into the furnace and lower the furnace pressure to atmospheric pressure. That is, a large amount of refrigerant gas χ will be disposed of here, and the large consumption of refrigerant gas will be a blessing in disguise. For this reason, it is desired to suppress the refrigerant gas as much as possible.
この発明はこのような開運を解決するためになされたも
ので、その目的は前記冷媒ガスを従来の方法よりも大巾
に簡約できる強制対流冷却のガス導入方法を提供するこ
とである。The present invention has been made to solve this problem, and its purpose is to provide a forced convection cooling gas introduction method that can reduce the amount of refrigerant gas used to a greater extent than conventional methods.
この発明について述べると、熱処理炉に冷媒ガスを導入
して規定圧力となさしめ、熱処理材の強制対流冷却を行
い、該冷却中前記規定圧力を保つように冷媒ガスｔ’追
加供給し、前記熱処理材が所定温度に達したならば、以
後の冷媒ガスの追加供＠衾停止し、同一に在中の冷媒ガ
スのみによって冷却な行うこと′ｆ！：″１＃徴とする
強制対流冷却のガス導入方法である。To describe this invention, a refrigerant gas is introduced into a heat treatment furnace to a specified pressure, forced convection cooling is performed on the heat-treated material, and during the cooling, refrigerant gas t' is additionally supplied so as to maintain the specified pressure, and the heat treatment Once the material reaches a predetermined temperature, stop further supply of refrigerant gas and continue cooling only with the existing refrigerant gas. This is a forced convection cooling gas introduction method with 1# characteristic.
以丁これについて詳述する。I will explain this in detail.
矛１図に示すものは膚の恒温変態曲線と冷却連縦軸Ｋｍ
度が設定されている。同図にお―てｌは鋼の変態曲線で
あり、一般に８曲線と呼ばれている・２はこの８曲線上
の上部迅速変順部であり、一般に８曲線の鼻と呼ばれて
いる。そして＊ｔ’ｍ入れするためには、その冷却カー
ブが前記鼻２Ｋかからないように冷却することが必要と
なる＠前記５Ｅｌｈ、ｍの鼻２は、温度約６００℃〜７
００ ＣのＪｌ＠囲にあり、同＃ｉ囲以丁の温度にお−
ては、冷却速度は小さくても焼入れそのものには影響し
ない。この発明は強制対流冷却の過程におい【、初めは
規定のガス圧力で冷却１に行−１その冷却曲線が８曲線
の鼻２？橿適した後は、冷却収縮によりガス圧力が低下
しても、ガス導入を停止して、ガスの節約を行うもので
ある。同図中４は従来のガス導入法による場合の鋼の冷
却速度を示すカーブであり、５はこの発明によるガス導
入方法によった場合の冷却速度を示すカーブであり、６
は焼入れので８ない場合のカーブ？示すものである。同
カーブ６は８Ｅｌ［の鼻２Ｋかかつ”（ｉ５ｆ）、焼入
れが行われなＶ′６
なお、この発＃１において、冷媒ガスの追加導入を停止
する熱処理材の温度にクーて、これｔ所定温度と述べた
が、これは熱処理の諸条件によつ変るものであるため、
任意に設定するものである。Figure 1 shows the isothermal transformation curve of the skin and the cooling continuous vertical axis Km.
degree is set. In the figure, l is the transformation curve of steel, generally called the 8 curve. 2 is the upper rapid transformation part on this 8 curve, generally called the nose of the 8 curve. In order to insert *t'm, it is necessary to cool the cooling curve so that the temperature does not exceed the nose 2K.
It is in the Jl@ range of 00 C and the temperature in the same #i range -
Therefore, even if the cooling rate is small, it does not affect the quenching itself. In the process of forced convection cooling, this invention first goes to cooling 1 with a specified gas pressure - 1 whose cooling curve is 8 curves 2? After cooling, even if the gas pressure decreases due to cooling contraction, gas introduction is stopped to save gas. In the figure, 4 is a curve showing the cooling rate of steel when using the conventional gas introduction method, 5 is a curve showing the cooling rate when using the gas introduction method according to the present invention, and 6 is a curve showing the cooling rate when using the gas introduction method according to the present invention.
Is it a curve when there is no 8 because it is hardened? It shows. The same curve 6 is 8El['s nose 2K kakatsu'' (i5f), and V'6 is not quenched. Although I mentioned the predetermined temperature, this varies depending on the heat treatment conditions, so
This can be set arbitrarily.
次に、前記冷媒ガスの追加導入の停止によるガスの噴約
についてみると、次のようになる。例えば鋼の冷却カー
ブがＳ曲線の鼻２’＠ｊｉｇ遇している際の、冷媒ガス
の温度は約３００℃であり、冷凹終了時の同ガス温度１
に：４０℃とすれば、圧力は絶対温度に比例するので、
（３００＋２７３ ）／（２７３＋４０ ）Ｉ”＝１．
８３ となり、この発明の方法、即ち８曲線の鼻２馨通
過した時点で冷媒ガスの炉内導入を停止する方法？用い
ることＫより、従来の方法即ち冷却終了迄規定のガス圧
力を保つために、間欠的に炉内にガスな導入し琥けるも
のく比較して、ガスの消費量は約１／１．８となる。Next, regarding gas injection due to stopping the additional introduction of refrigerant gas, the following will occur. For example, when the cooling curve of steel is at the nose 2'@jig of the S curve, the temperature of the refrigerant gas is approximately 300°C, and the temperature of the refrigerant gas at the end of the cooling concave is 1
If the temperature is 40℃, pressure is proportional to absolute temperature, so (300+273)/(273+40)I"=1.
83 Therefore, is the method of this invention, that is, the method of stopping the introduction of refrigerant gas into the furnace when it passes the nose 2 of the 8 curve? Compared to the conventional method, which involves intermittently introducing gas into the furnace to maintain a specified gas pressure until the end of cooling, the gas consumption is approximately 1/1.8. becomes.
この発明は前記のように構成され、冷媒ガスの温度が降
丁し【所定温度に達したならば、その熱処理炉に対する
冷媒ガスの導入’ａ’ＦＦ止することにより、焼入れ等
の熱処ｆＩｉを普ｉＫ行うことができると共に冷媒ガス
を従来よりも大巾Ｍｍ約することができる。The present invention is constructed as described above, and when the temperature of the refrigerant gas decreases and reaches a predetermined temperature, the introduction of the refrigerant gas to the heat treatment furnace is stopped. It is possible to carry out a wide range of refrigerant gases and reduce the amount of refrigerant gas to a greater extent than in the past.
矛１図は、この発明の実施例と従来の方法によるものを
共に示すもので、溝の恒温変態と冷却速度の関係を示す
グラフである。
代理人升現七 Ｍｍ 侑
（ほか ２名）Figure 1 shows both the embodiment of the present invention and the conventional method, and is a graph showing the relationship between isothermal transformation of the groove and cooling rate. Agent Masu Genshichi Mm Yu (and 2 others)
Claims (1)
処理材の強制対流冷却を行い、該冷却中前記規定圧力を
保つように冷媒ガスを追加供給し、前記熱処理材が所定
温度に達したならｆｔ特徴とする強制対流冷却のガス導
入方法０A refrigerant gas is introduced into the heat treatment furnace to reach a specified pressure, forced convection cooling is performed on the heat-treated material, and during cooling, additional refrigerant gas is supplied to maintain the specified pressure, and the heat-treated material reaches a predetermined temperature. Nara ft features forced convection cooling gas introduction method 0
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11945384A JPS60262913A (en) | 1984-06-11 | 1984-06-11 | Method for introducing gas in forced-convection cooling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11945384A JPS60262913A (en) | 1984-06-11 | 1984-06-11 | Method for introducing gas in forced-convection cooling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60262913A true JPS60262913A (en) | 1985-12-26 |
Family
ID=14761751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11945384A Pending JPS60262913A (en) | 1984-06-11 | 1984-06-11 | Method for introducing gas in forced-convection cooling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60262913A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01149920A (en) * | 1987-10-28 | 1989-06-13 | Degussa Ag | Heat-treatment of metal processed parts |
| JP2012207306A (en) * | 2011-03-28 | 2012-10-25 | Ipsen Inc | Quenching method, and apparatus for practicing the method |
-
1984
- 1984-06-11 JP JP11945384A patent/JPS60262913A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01149920A (en) * | 1987-10-28 | 1989-06-13 | Degussa Ag | Heat-treatment of metal processed parts |
| JP2012207306A (en) * | 2011-03-28 | 2012-10-25 | Ipsen Inc | Quenching method, and apparatus for practicing the method |
| US9617611B2 (en) | 2011-03-28 | 2017-04-11 | Ipsen, Inc. | Quenching process and apparatus for practicing said process |
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