JPH0448028A - Heat treatment of spheroidal graphite cast iron blank material and device therefor - Google Patents
Heat treatment of spheroidal graphite cast iron blank material and device thereforInfo
- Publication number
- JPH0448028A JPH0448028A JP15924790A JP15924790A JPH0448028A JP H0448028 A JPH0448028 A JP H0448028A JP 15924790 A JP15924790 A JP 15924790A JP 15924790 A JP15924790 A JP 15924790A JP H0448028 A JPH0448028 A JP H0448028A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- cast iron
- graphite cast
- cooling medium
- spheroidal graphite
- 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
- 238000010438 heat treatment Methods 0.000 title claims abstract description 70
- 239000000463 material Substances 0.000 title claims abstract description 43
- 229910001141 Ductile iron Inorganic materials 0.000 title claims abstract description 15
- 239000002826 coolant Substances 0.000 claims abstract description 24
- 239000002344 surface layer Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims description 28
- 238000010791 quenching Methods 0.000 claims description 16
- 230000000171 quenching effect Effects 0.000 claims description 16
- 230000003028 elevating effect Effects 0.000 claims description 15
- 238000005279 austempering Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910001018 Cast iron Inorganic materials 0.000 claims 1
- 229910002804 graphite Inorganic materials 0.000 claims 1
- 239000010439 graphite Substances 0.000 claims 1
- 229910001563 bainite Inorganic materials 0.000 abstract description 12
- 230000006698 induction Effects 0.000 abstract description 12
- 150000003839 salts Chemical class 0.000 abstract description 9
- 101100165177 Caenorhabditis elegans bath-15 gene Proteins 0.000 abstract description 7
- 230000009466 transformation Effects 0.000 abstract description 7
- 238000011282 treatment Methods 0.000 description 8
- 229910001566 austenite Inorganic materials 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical group OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011418 maintenance treatment Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、球状黒鉛鋳鉄素材のオーステンパ処理方法及
びその装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for austempering a spheroidal graphite cast iron material.
（従来の技術）
従来、球状黒鉛鋳鉄素材のオーステンパ処理として、例
えば特開昭６３−２８３０９号のような方法が知られて
いる。この方法では素材を９２５℃〜１０５０℃の高温
で加熱してオーステナイト化し、次いでパーライト変態
を起さない速さで２００℃〜４５０℃の恒温保持温度ま
で冷却して、恒温変態によってベイナイト組織を得よう
とするものである。(Prior Art) Conventionally, as an austempering treatment for spheroidal graphite cast iron materials, a method such as that disclosed in Japanese Patent Application Laid-Open No. 63-28309 has been known. In this method, the material is heated to a high temperature of 925°C to 1050°C to austenite, and then cooled to a constant temperature of 200°C to 450°C at a rate that does not cause pearlite transformation to obtain a bainitic structure through isothermal transformation. This is what we are trying to do.
又、素材の所要の硬さを保持し、しかも残留オーステナ
イトを消去させるため、特開昭６３−１０５９２０号の
ような熱処理方法も知られている。この場合は加熱した
素材を一旦低温の熱浴で焼入れし、次いでこれより高温
の熱浴に投入して一定時間保持し恒温変態させることに
より靭性に優れたベイナイト組織を得ようとしている。Further, in order to maintain the required hardness of the material and eliminate residual austenite, a heat treatment method such as that disclosed in JP-A-63-105920 is also known. In this case, the heated material is first quenched in a low-temperature heat bath, then placed in a higher-temperature heat bath and held for a certain period of time to undergo isothermal transformation, thereby obtaining a bainite structure with excellent toughness.
しかし、かかる従来のオーステンパ処理によると、素材
のサイズが大ぎくなると表層部と中心部の生成組織が異
なるという問題があり、これを解決するため、例えば特
公昭６３−２１７２７号のような熱処理方法も知られて
いる。この方法は一旦球状黒鉛鋳鉄素材全体を焼入れ加
熱した後、表層部のみ更に高温に再加熱して表層部の固
溶炭素量を増やし、次いで急冷して恒温処理し、素材全
体に均一なベイナイト組織を得ようとするものである。However, according to such conventional austempering treatment, there is a problem that when the size of the material becomes large, the generated structure is different between the surface layer and the center. is also known. This method involves first quenching and heating the entire spheroidal graphite cast iron material, then reheating only the surface layer to an even higher temperature to increase the amount of solid solute carbon in the surface layer, followed by rapid cooling and constant temperature treatment to create a uniform bainite structure throughout the material. It is an attempt to obtain.
（発明が解決しようとする課題）
しかし、素材のサイズが大型化し、前述の特公昭［１３
−２１７２７号のような技術を用いる場合、素材の必要
部のみに靭性、耐摩耗性等の特性があれば良いような場
合にあっても、素材全体を焼入れ加熱するため、加熱に
要する熱容量が大きくしかも加熱時間を要し、又恒温保
持処理時のヒートパターンの自由度も少なく且つ処理時
間を要するという問題があった。(Problem to be solved by the invention) However, as the size of the material became larger, the aforementioned Tokkosho [13
When using a technology such as No. 21727, even if it is sufficient to have properties such as toughness and wear resistance only in the necessary parts of the material, the entire material is quenched and heated, so the heat capacity required for heating is There are problems in that it is large and requires a long heating time, and there is little flexibility in the heat pattern during constant temperature maintenance treatment and requires a long processing time.
（課題を解決するための手段）
かかる課題を解決するため、本発明は素材の必要部分の
みに靭性の優れたベイナイト組織を得るため、素材の主
として表層部を高周波加熱によって９５０℃〜１０５０
℃に焼入れ加熱し、次いで３００℃〜５００℃の高温冷
却媒体により急冷して焼入れた後、高温冷却媒体又は高
周波加熱によって３００℃〜５００℃に恒温保持するよ
うにした。(Means for Solving the Problem) In order to solve the problem, the present invention heats mainly the surface layer of the material to a temperature of 950°C to 1050°C by high-frequency heating in order to obtain a bainite structure with excellent toughness only in the necessary parts of the material.
After being quenched and heated to a temperature of 300°C to 500°C, and then rapidly cooled and hardened using a high temperature cooling medium of 300°C to 500°C, the temperature was maintained at a constant temperature of 300°C to 500°C using a high temperature cooling medium or high frequency heating.
又３００℃〜４００℃の高温冷却媒体で急冷した後、再
度高周波加熱によってこれより高温の３５０℃〜５００
℃で保持するようにした。After rapid cooling with a high-temperature cooling medium of 300°C to 400°C, high-frequency heating is performed again to a higher temperature of 350°C to 500°C.
It was kept at ℃.
又、 ３００℃〜５００℃の高温冷却媒体によって急冷
して焼入れた後、高温冷却媒体又は高周波加熱によって
３００℃〜５００℃で恒温保持し、次いで温度範囲の異
なる１５０℃〜４００℃で恒温保持するようにした。Also, after quenching and quenching with a high-temperature cooling medium of 300°C to 500°C, the temperature is maintained at a constant temperature of 300°C to 500°C using a high-temperature cooling medium or high-frequency heating, and then constant temperature is maintained at a different temperature range of 150°C to 400°C. I did it like that.
そしてかかる方法を行なうための装置として、素材を保
持する保持治具と、素材の表層部を加熱する高周波加熱
コイルと、焼入れ用の冷却媒体槽を設け、前記保持治具
が保持する素材を、昇降駆動部によって高周波加熱コイ
ルと冷却媒体槽間を往復動自在に構成するとともに、回
転駆動部によって高周波加熱コイル内で回転自在となる
よう構成した。As a device for carrying out such a method, a holding jig for holding the material, a high-frequency heating coil for heating the surface layer of the material, and a cooling medium tank for quenching are provided, and the material held by the holding jig is The elevating drive section is configured to freely reciprocate between the high frequency heating coil and the cooling medium tank, and the rotation drive section is configured to freely rotate within the high frequency heating coil.
（作用）
焼入れ加熱を高周波加熱によって行ない、しかも素材の
主として表層部のみを加熱することで、主知時間に処理
可能となり、必要な部分のみのベイナイト化が効率的に
行なえる。又素材のサイズに影６を受けない。(Function) By performing the quenching heating by high-frequency heating and mainly heating only the surface layer of the material, it is possible to perform the treatment in the main time, and it is possible to efficiently convert only the necessary parts into bainite. Also, the size of the material does not affect the shadow 6.
又、恒温保持に高周波加熱を通用することにより、加熱
昇温の応答性が良く、ヒートパターンの自由度が向上す
る。しかも処理時間の短縮が可能である。Furthermore, by using high-frequency heating for constant temperature maintenance, the responsiveness of heating temperature increases is improved, and the degree of freedom in heat patterns is improved. Moreover, processing time can be shortened.
そしてかかる方法は、本然処理装置によって容易に行な
うことができる。Such a method can be easily carried out using a natural processing device.
（実施例）
本発明の熱処理方法及びその装置の実施例について添付
した図面に基づき説明する。(Example) Examples of the heat treatment method and apparatus of the present invention will be described based on the attached drawings.
第１図、第２図は本発明の熱処理装置の実施例を示し、
第３図から第６図は熱処理方法を示す工程図である。FIG. 1 and FIG. 2 show an embodiment of the heat treatment apparatus of the present invention,
3 to 6 are process diagrams showing the heat treatment method.
第１図に示すように、本発明の熱処理装置１はオーステ
ンパ処理用として構成され、基板２に取り付けられた昇
降用ガイドシャフト３と、このガイドシャフト３に案内
されて昇降自在な昇降体４を備えている。この昇降体４
は、前記昇降用ガイドシャフト３を挿通せしめたプレー
ト部材５と、昇降体４を昇降動させる昇降駆動部として
の昇降シリンダユニット６と、プレート部材５に回転可
能に軸受され且つ下方に延出する駆動シャフト７を備え
、この駆動シャフト７はそのまま下方の基板２及び基板
２に取り付けられた軸受部材８を貫いて、その下端にワ
ークＷ保持用の保持治具９を備えている。又、基板２に
は、保持治具９を駆動シャフト７を介してシャフト７軸
まわりに回転させるためのインダクションモータ１０と
、ベルト、プーリ等からなる回転力伝達機構１１が設け
られており、この回転駆動部としてのインダクションモ
ータ１０の回転によって保持治具９で保持されるワーク
Ｗも回転する。As shown in FIG. 1, the heat treatment apparatus 1 of the present invention is configured for austempering treatment, and includes an elevating guide shaft 3 attached to a substrate 2, and an elevating body 4 that is guided by this guide shaft 3 and can be freely raised and lowered. We are prepared. This elevating body 4
is a plate member 5 into which the elevating guide shaft 3 is inserted, an elevating cylinder unit 6 as an elevating drive unit that moves the elevating body 4 up and down, and is rotatably supported by the plate member 5 and extends downward. A drive shaft 7 is provided, and this drive shaft 7 passes through the lower substrate 2 and the bearing member 8 attached to the substrate 2, and is provided with a holding jig 9 for holding the workpiece W at its lower end. Further, the substrate 2 is provided with an induction motor 10 for rotating the holding jig 9 around the shaft 7 axis via the drive shaft 7, and a rotational force transmission mechanism 11 consisting of a belt, a pulley, etc. The workpiece W held by the holding jig 9 also rotates due to the rotation of the induction motor 10 serving as a rotational drive unit.
一方、昇降体４が上昇した状態におけるワークＷの対応
位置には、高周波８導加熱コイル１３が設けられている
。そしてこの高周波８導加熱コイル１３は、ワークＷの
外周面から所定間隔をおいて周囲を取り巻くが如く環状
に複数巻きとなって構成されており、高周波電源１４に
接続されるとともに、その内部にはコイル１３自身を冷
却するための不図示の冷却水路を備えている。On the other hand, a high-frequency eight-conductor heating coil 13 is provided at a position corresponding to the workpiece W when the elevating body 4 is raised. The high-frequency 8-conduction heating coil 13 is configured to have a plurality of turns surrounding the work W at a predetermined interval from the outer peripheral surface of the workpiece W, and is connected to the high-frequency power source 14 and is connected to the inside of the workpiece W. is equipped with a cooling water channel (not shown) for cooling the coil 13 itself.
この高周波８導加熱コイル１３の下方には、冷却媒体槽
としてのソルトバス１５が設けられている。そして実施
例ではこのソルトバス１５の冷却媒体には硝酸塩が用い
られ、電力加熱式として構成されるとともに、溶融塩浴
を攪拌するための不図示のポンプも附属されて、均一な
冷却が円滑に行なえるようにしている。そして前述の昇
降体４が降下すると、保持治具９で保持されるワークＷ
がソルトバス１５中に浸漬せられることとなる。A salt bath 15 as a cooling medium tank is provided below this high-frequency eight-conductor heating coil 13. In the embodiment, nitrate is used as the cooling medium for the salt bath 15, and it is constructed as an electric heating type, and a pump (not shown) is also attached to stir the molten salt bath, thereby ensuring smooth uniform cooling. I am trying to do it. Then, when the above-mentioned elevating body 4 descends, the workpiece W held by the holding jig 9
will be immersed in the salt bath 15.
かかる熱処理装置１による熱処理方法について第３図以
下をも用いて説明する。A heat treatment method using such a heat treatment apparatus 1 will be explained with reference to FIG. 3 and subsequent figures.
第１図に示すように、球状黒鉛鋳鉄素材のワークＷは保
持治具９に垂直に取り付けられ、昇降体４が上昇した状
態で高周波８導加熱コイル１３内に挿入された状態とな
る。As shown in FIG. 1, the workpiece W made of spheroidal graphite cast iron is vertically attached to the holding jig 9, and is inserted into the high-frequency 8-conduction heating coil 13 with the elevating body 4 raised.
次いでインダクションモータ１０を作動させてワークＷ
を約１００〜２０Ｏｒｐｍの回転数で回転させつつ、同
時に高周波８導加熱コイル１３に高周波電流を流して、
ワークＷの所要部の表層部を均一に加熱する。Next, the induction motor 10 is operated to move the workpiece W.
While rotating at a rotation speed of approximately 100 to 20 rpm, at the same time a high frequency current is passed through the high frequency 8 conductive heating coil 13,
The surface layer of the required part of the workpiece W is heated uniformly.
ワークＷの所要部が所定の焼入温度（９５０℃〜１０５
０℃）になると高周波電流の供給を停止し、８導加熱工
程を終了する。Required parts of the workpiece W are heated to a predetermined quenching temperature (950°C to 105°C).
0° C.), the supply of high frequency current is stopped and the 8-conductor heating process is completed.
次いで第２図に示すように昇降シリンダユニット６を作
動させてワークＷをソルトバス１５中に浸漬する。この
時のソルトバス１５中の冷却媒体ハ３００℃〜５００℃
の所定温度に保持されており、浸漬されたワークＷはこ
の高温冷却媒体によって急速冷却され焼入れされる。そ
して第３図に示すようにこのワークＷは引き続いて高温
冷却媒体中で恒温保持され、所要部の表層部のベイナイ
ト組織への恒温変態が完了する。Next, as shown in FIG. 2, the lifting cylinder unit 6 is operated to immerse the workpiece W into the salt bath 15. The cooling medium in the salt bath 15 at this time is 300°C to 500°C.
The immersed workpiece W is rapidly cooled and hardened by this high-temperature cooling medium. Then, as shown in FIG. 3, this workpiece W is subsequently maintained at a constant temperature in a high-temperature cooling medium, and the isothermal transformation of the surface layer of the required portion into a bainite structure is completed.
この際下限温度を３００℃としているのは、表層部のマ
ルテンサイト化を避けるためであり、上限温度を５００
℃としているのは、ソルバイト組織の生成を避けるため
である。The reason why the lower limit temperature is set at 300°C is to avoid martensite formation in the surface layer, and the upper limit temperature is set at 500°C.
The temperature is set at ℃ in order to avoid the formation of sorbite structure.
次に第４図は高周波８導加熱によって９５０ｔ：〜１０
５０℃に加熱後、高温冷却媒体によって３００ｔ〜４０
０℃に冷却し、その後昇降シリンダユニット６の作動に
よってワークＷを引き上げ、再び高周波加熱によって加
熱し、高温冷却媒体より温度の高い３５０℃〜５００℃
で恒温保持するようにしたものであり、前述の第３図の
方法に較べて処理タイムの短縮が可能である。そして急
冷温度は温度範囲の下限値に近づけ、一方恒温保持の温
度を温度範囲の上限値に近づけることによって、ベイナ
イト化の促進を図ることが出来る。又この際高周波で加
熱することによって、昇温の応答性が良く、又、ヒート
パターンの自由度が増す。Next, Figure 4 shows 950t: ~ 10
After heating to 50℃, 300t~40
The workpiece W is cooled to 0°C, then pulled up by the operation of the lifting cylinder unit 6, and heated again by high-frequency heating to 350°C to 500°C, which is higher in temperature than the high-temperature cooling medium.
This method is designed to maintain a constant temperature at a constant temperature, and the processing time can be shortened compared to the method shown in FIG. 3 described above. By bringing the quenching temperature closer to the lower limit of the temperature range and, on the other hand, bringing the constant temperature maintenance temperature closer to the upper limit of the temperature range, bainite formation can be promoted. Furthermore, by heating with high frequency at this time, the responsiveness of the temperature increase is good and the degree of freedom in the heat pattern is increased.
第５図は恒温保持工程中、所要温度範囲内でサイクル的
に加熱、冷却を縁り返すようにしたものであり、更に一
層の時間短縮が可能である。すなわち実施例では３００
ｔ：までの冷却と ５００ｔ：までの加熱を間歇的に繰
り返し行ない処理する。FIG. 5 shows a method in which heating and cooling are repeated in cycles within the required temperature range during the constant temperature holding step, which allows for further reduction in time. That is, in the example, 300
The treatment is performed by intermittently repeating cooling up to t: and heating up to 500 t:.
次に第６図は恒温保持を異なる２段階の温度で行なうよ
うにしたものである。すなわち前述のようなオーステン
パ処理法によると、処理後に僅かながらも残留オーステ
ナイトが残り、この残留オーステナイトがＭ／Ｃ加工等
においてマルテンサイト化するので、それを避けるため
ベイナイト化処理するものである。そしてこの方法では
、３００℃〜５００℃の高温冷却媒体によって急冷した
後、高温冷却媒体若しくは高周波誘導加熱によって３０
０℃〜５００℃に保持し、次いで一部Ｍｓ点を通過して
常温まで徐冷した後高周波誘導加熱によって１５０℃〜
４００℃に再加熱し保持する。こうすると残留オーステ
ナイトのベイナイト化が促進される。この際徐冷により
Ｍｓ点を一旦通過させるのは、マルテンサイト化を防ぐ
ためである。又こうして形成されるベイナイト組織は、
恒温保持温度を変化させることによって上部ベイナイト
組織と下部ベイナイト組織の共存組織を得ることが出来
る。又、特に高周波で加熱保持する場合には、いずれか
への変態が完全に終了しないうちに短時間に温度変化を
行なうのが望ましい。Next, FIG. 6 shows a case in which constant temperature maintenance is carried out at two different temperatures. That is, according to the austempering method described above, a small amount of residual austenite remains after the treatment, and this residual austenite becomes martensite during M/C processing, etc., so the bainite treatment is performed to avoid this. In this method, after rapid cooling with a high-temperature cooling medium of 300 to 500 degrees Celsius, the
The temperature was maintained at 0°C to 500°C, then partially passed through the Ms point and slowly cooled to room temperature, and then heated to 150°C by high-frequency induction heating.
Reheat and hold at 400°C. In this way, the conversion of retained austenite to bainite is promoted. At this time, the reason why the material is allowed to pass through the Ms point once by slow cooling is to prevent martensite formation. Moreover, the bainite structure formed in this way is
By changing the constant temperature, a structure in which an upper bainite structure and a lower bainite structure coexist can be obtained. In addition, especially when heating and holding with high frequency, it is desirable to change the temperature in a short period of time before the transformation to any one of them is completely completed.
尚、本発明の熱処理装置では恒温変態を電気炉、雰囲気
炉、流動炉等によって行なうことも可能である。すなわ
ちソルトバスによる焼入後昇降体４を上昇させ、ワーク
Ｗを保持治具９から取り外して上記電気炉等のいずれか
で所要温度、所要時間恒温保持する。In addition, in the heat treatment apparatus of the present invention, it is also possible to carry out isothermal transformation using an electric furnace, an atmosphere furnace, a fluidized fluidized furnace, or the like. That is, after quenching in a salt bath, the elevating body 4 is raised, the workpiece W is removed from the holding jig 9, and the workpiece W is kept constant at a required temperature and for a required time in one of the above-mentioned electric furnaces or the like.
（発明の効果）
以上のように本発明の熱処理方法及び装置においては、
球状黒鉛鋳鉄素材の焼入れ加熱において、必要部を局所
的にしかも表層部のみ高周波誘導加熱によって行なうよ
うにしたため、素材のサイズに制約を受けず且つ効率的
に処理することが出来る。又、恒温保持に高周波誘導加
熱を用いることによってヒートパターンの自由度が増し
、所望の変態組織を容易に得ることが出来る。しかも高
周波加熱によると熱応答性が速く生産性の向上にも寄与
し得る。(Effects of the invention) As described above, in the heat treatment method and apparatus of the present invention,
In quenching and heating the spheroidal graphite cast iron material, the necessary parts are heated locally and only the surface layer is heated by high frequency induction, so that the material can be efficiently processed without being restricted by the size of the material. Furthermore, by using high-frequency induction heating for constant temperature maintenance, the degree of freedom in heat patterns is increased, and a desired transformed structure can be easily obtained. Moreover, high-frequency heating has a fast thermal response and can contribute to improving productivity.
第１図、第２図は本発明の熱処理装置を示し、第３図か
ら第６図は熱処理方法を示す工程図である。
尚同図中、１は熱処理装置、４は昇降体、６は昇降シリ
ンダユニット、９は保持治具、１０はインダクションモ
ータ、１３は高周波誘導加熱コイル、１５はソルトバス
、Ｗはワークをボす。1 and 2 show the heat treatment apparatus of the present invention, and FIGS. 3 to 6 are process diagrams showing the heat treatment method. In the figure, 1 is a heat treatment device, 4 is an elevating body, 6 is an elevating cylinder unit, 9 is a holding jig, 10 is an induction motor, 13 is a high-frequency induction heating coil, 15 is a salt bath, and W is a workpiece. .
Claims (4)
理方法において、 この方法は、前記素材の主として表層部を高周波加熱に
より９５０℃〜１０５０℃の焼入温度に加熱し、次いで
３００℃〜５００℃の高温冷却媒体によって急冷して焼
入れた後、高温冷却媒体又は高周波加熱により３００℃
〜５００℃に恒温保持することを特徴とする球状黒鉛鋳
鉄素材の熱処理方法。(1) In a heat treatment method of austempering a spheroidal graphite cast iron material, this method involves heating mainly the surface layer of the material to a quenching temperature of 950°C to 1050°C by high-frequency heating, and then heating the material to a quenching temperature of 300°C to 500°C. After being rapidly cooled and hardened using a high-temperature cooling medium, the temperature is reduced to 300℃ using a high-temperature cooling medium or high-frequency heating.
A method for heat treatment of spheroidal graphite cast iron material, characterized by maintaining constant temperature at ~500°C.
理方法において、 この方法は、前記素材の主として表層部を高周波加熱に
より９５０℃〜１０５０℃の焼入温度に加熱し、次いで
３００℃〜４００℃の高温冷却媒体によって急冷して焼
入れた後、再度高周波加熱によって前記高温冷却媒体よ
り高温の３５０℃〜５００℃で保持することを特徴とす
る球状黒鉛鋳鉄素材の熱処理方法。(2) In a heat treatment method of austempering a spheroidal graphite cast iron material, this method involves heating mainly the surface layer of the material to a quenching temperature of 950°C to 1050°C by high-frequency heating, and then heating the material to a quenching temperature of 300°C to 400°C. A method for heat treating a spheroidal graphite cast iron material, which comprises rapidly cooling and quenching with a high-temperature cooling medium, and then holding the material at a temperature of 350°C to 500°C, which is higher than the high-temperature cooling medium, by high-frequency heating again.
理方法において、 この方法は前記素材の主として表層部を高周波加熱によ
り９５０℃〜１０５０℃の焼入温度に加熱し、次いで３
００℃〜５００℃の高温冷却媒体によって急冷して焼入
れた後、高温冷却媒体又は高周波加熱によって３００℃
〜５００℃で恒温保持し、次に温度範囲の異なる１５０
℃〜４００℃で恒温保持することを特徴とする球状黒鉛
鋳鉄素材の熱処理方法。(3) In a heat treatment method of austempering a spheroidal graphite cast iron material, this method involves heating mainly the surface layer of the material to a quenching temperature of 950°C to 1050°C by high-frequency heating, and then
After being rapidly cooled and hardened with a high temperature cooling medium of 00℃ to 500℃, the temperature is reduced to 300℃ with a high temperature cooling medium or high frequency heating.
〜500℃ and then 150℃ with different temperature range.
A method for heat treating a spheroidal graphite cast iron material, which is characterized by maintaining a constant temperature at a temperature of 400°C to 400°C.
理装置において、 この装置は、前記素材を保持する保持治具と、素材の表
層部を加熱する高周波加熱コイルと、焼入れ用の冷却媒
体槽を備え、前記保持具が保持する素材は、昇降駆動部
によって前記高周波加熱コイルと冷却媒体槽間を往復動
自在となり且つ回転駆動部によって前記高周波加熱コイ
ル内で回転自在とされたことを特徴とする球状黒鉛鋳鉄
素材の熱処理装置。(4) A heat treatment device for austempering a spheroidal graphite cast iron material, which is equipped with a holding jig that holds the material, a high-frequency heating coil that heats the surface layer of the material, and a cooling medium tank for quenching. , the material held by the holder is spherical, and is capable of reciprocating between the high-frequency heating coil and the cooling medium tank by an elevating drive unit, and is freely rotatable within the high-frequency heating coil by a rotation drive unit. Heat treatment equipment for graphite cast iron materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2159247A JP2685965B2 (en) | 1990-06-18 | 1990-06-18 | Heat treatment method for spheroidal graphite cast iron material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2159247A JP2685965B2 (en) | 1990-06-18 | 1990-06-18 | Heat treatment method for spheroidal graphite cast iron material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0448028A true JPH0448028A (en) | 1992-02-18 |
| JP2685965B2 JP2685965B2 (en) | 1997-12-08 |
Family
ID=15689572
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2159247A Expired - Fee Related JP2685965B2 (en) | 1990-06-18 | 1990-06-18 | Heat treatment method for spheroidal graphite cast iron material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2685965B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6884049B2 (en) * | 2001-12-12 | 2005-04-26 | Hitachi, Ltd., | Screw compressor and method of manufacturing rotor for the same |
| JP2008519154A (en) * | 2004-09-17 | 2008-06-05 | プルマン インダストリーズ インコーポレイテッド | Method for producing high-strength iron article and article produced thereby |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5871328A (en) * | 1981-10-23 | 1983-04-28 | Toyota Motor Corp | Heat treatment of cast iron |
| JPS59107018A (en) * | 1982-12-08 | 1984-06-21 | Mazda Motor Corp | Heat treatment of cast iron parts |
| JPS6289808A (en) * | 1985-10-15 | 1987-04-24 | Asahi Malleable Iron Co Ltd | Manufacture of spheroidal graphite cast iron having bainite matrix |
| JPS63105920A (en) * | 1986-10-23 | 1988-05-11 | Toyota Autom Loom Works Ltd | Method for heat treating cast iron |
| JPS63266019A (en) * | 1987-04-23 | 1988-11-02 | Meidensha Electric Mfg Co Ltd | Method of non-oxidizing induction heat treatment for metal material |
-
1990
- 1990-06-18 JP JP2159247A patent/JP2685965B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5871328A (en) * | 1981-10-23 | 1983-04-28 | Toyota Motor Corp | Heat treatment of cast iron |
| JPS59107018A (en) * | 1982-12-08 | 1984-06-21 | Mazda Motor Corp | Heat treatment of cast iron parts |
| JPS6289808A (en) * | 1985-10-15 | 1987-04-24 | Asahi Malleable Iron Co Ltd | Manufacture of spheroidal graphite cast iron having bainite matrix |
| JPS63105920A (en) * | 1986-10-23 | 1988-05-11 | Toyota Autom Loom Works Ltd | Method for heat treating cast iron |
| JPS63266019A (en) * | 1987-04-23 | 1988-11-02 | Meidensha Electric Mfg Co Ltd | Method of non-oxidizing induction heat treatment for metal material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6884049B2 (en) * | 2001-12-12 | 2005-04-26 | Hitachi, Ltd., | Screw compressor and method of manufacturing rotor for the same |
| JP2008519154A (en) * | 2004-09-17 | 2008-06-05 | プルマン インダストリーズ インコーポレイテッド | Method for producing high-strength iron article and article produced thereby |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2685965B2 (en) | 1997-12-08 |
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