JPS6342111Y2 - - Google Patents
Info
- Publication number
- JPS6342111Y2 JPS6342111Y2 JP13180384U JP13180384U JPS6342111Y2 JP S6342111 Y2 JPS6342111 Y2 JP S6342111Y2 JP 13180384 U JP13180384 U JP 13180384U JP 13180384 U JP13180384 U JP 13180384U JP S6342111 Y2 JPS6342111 Y2 JP S6342111Y2
- Authority
- JP
- Japan
- Prior art keywords
- processing chamber
- vacuum
- furnace
- nitrogen gas
- openings
- 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.)
- Expired
Links
- 238000001816 cooling Methods 0.000 claims description 19
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 239000011261 inert gas Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 25
- 229910001873 dinitrogen Inorganic materials 0.000 description 25
- 239000007789 gas Substances 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 6
- 238000009825 accumulation Methods 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Landscapes
- Furnace Details (AREA)
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
この考案は真空炉内に導入された不活性ガスを
冷却フアンで循環させることにより、加熱処理さ
れた処理物を冷却して焼入れを行う真空焼入れ炉
に関する。[Detailed explanation of the invention] (a) Industrial application field This invention cools and hardens the heat-treated material by circulating an inert gas introduced into a vacuum furnace using a cooling fan. Regarding vacuum quenching furnaces.
(ロ) 従来技術
この種の真空焼入れ炉においては、処理物が収
納される真空炉内の処理室へノズル等を介して不
活性ガス（主として窒素ガス）を冷却ガスとして
流入し加熱処理された処理物を冷却している。そ
して、処理室に流入された窒素ガスを処理室の隔
壁に設けられた開口を介して処理室外へ排出して
いる。(B) Prior art In this type of vacuum quenching furnace, an inert gas (mainly nitrogen gas) is flowed as a cooling gas through a nozzle etc. into the processing chamber in the vacuum furnace where the material to be processed is stored, and the material is heated. The processed material is being cooled. The nitrogen gas that has flowed into the processing chamber is discharged to the outside of the processing chamber through an opening provided in a partition wall of the processing chamber.
しかしながら、処理室の一端から他端に向けて
一方向に窒素ガスを流すと、窒素ガスが流入する
側の処理物は、窒素ガスが流出する側の処理物よ
りも速く冷却する。一方、処理室の中央部から窒
素ガスを流入させ、その両端部から流出させる焼
入れ炉の場合、処理室を流れる窒素ガスの流路が
略一定していることに起因して、処理室の中央部
に窒素ガスが流通しない所謂〓ガス溜り〓を生じ
る。ガス溜りが生じると、その部分の処理物の冷
却速度は遅くなる。特に、小物を大量焼入れする
場合にガス溜りを生じやすい。また、冷却速度の
上げるために窒素ガスを加圧状態で処理室に導入
する場合、前記ガス溜りによる不都合が著しくな
る。 However, when nitrogen gas flows in one direction from one end of the processing chamber to the other end, the object to be processed on the side where the nitrogen gas flows in cools faster than the object to be processed on the side where the nitrogen gas flows out. On the other hand, in the case of a quenching furnace in which nitrogen gas flows in from the center of the processing chamber and flows out from both ends, the flow path of the nitrogen gas flowing through the processing chamber is approximately constant. A so-called gas stagnation occurs in which nitrogen gas does not flow through the area. When gas accumulation occurs, the cooling rate of the processed material in that area slows down. In particular, gas accumulation is likely to occur when small items are hardened in large quantities. Further, when nitrogen gas is introduced into the processing chamber under pressure to increase the cooling rate, the problem caused by the gas accumulation becomes significant.
このように、従来の真空焼入れ炉は、処理室内
の窒素ガスの流路が一定していることから、処理
物に窒素ガスが当たる所と当たらない所が生じや
すい。そのため、処理物の冷却速度が不均一とな
り、焼入れのバラツキさらには焼入れ歪が発生し
やすいという欠点がある。 As described above, in the conventional vacuum quenching furnace, since the flow path of the nitrogen gas in the processing chamber is constant, it is easy for the workpiece to be exposed to nitrogen gas at some places and not at other places. Therefore, there is a drawback that the cooling rate of the processed material becomes non-uniform, and quenching variations and quenching distortions are likely to occur.
(ハ) 目的
この考案は、処理物の冷却速度を均一化し、焼
入れバルツキ等を押さえることができる真空焼入
れ炉を提供することを目的としている。(c) Purpose The purpose of this invention is to provide a vacuum quenching furnace that can uniformize the cooling rate of the processed material and suppress quenching fluctuations.
(ニ) 構成
この考案に係る真空焼入れ炉は、処理物が収納
される真空炉内の処理室に、流入された不活性ガ
スを処理室外へ流出させる開閉自在の開口部を複
数個設け、前記開口部を所定の順序で開放して不
活性ガスを流出させることにより処理室を流れる
不活性ガスの流路を可変し、ガス溜りが生じない
ようにしたことを特徴としている。(d) Structure The vacuum quenching furnace according to this invention is provided with a plurality of openable and closable openings in the processing chamber in the vacuum furnace in which the processed material is stored, through which the inert gas that has flowed in flows out of the processing chamber. It is characterized in that the flow path of the inert gas flowing through the processing chamber is varied by opening the openings in a predetermined order to allow the inert gas to flow out, thereby preventing gas accumulation from occurring.
(ホ) 実施例
第１図はこの考案の一実施例に係る真空焼入れ
炉の構成を略示した説明図、第２図は第１図のＡ
−Ａ断面図である。(E) Embodiment Figure 1 is an explanatory diagram schematically showing the structure of a vacuum hardening furnace according to an embodiment of this invention, and Figure 2 is an illustration of A in Figure 1.
-A sectional view.
同図において、１は真空炉、２は真空炉内に収
納される処理物、３は処理物を加熱するヒータ、
４はヒータ３を取り囲む断熱材である。断熱材の
両端には、窒素ガスが流出する開口５ａ，５ｂが
設けられている。の開口５ａ，５ｂは、遮蔽板６
ａ，６ｂで交互に覆われる。即ち、遮蔽板６ａ，
６ｂは連結棒６ｃによつて連結され、シリンダ７
によつて軸方向に連動して駆動される結果、開口
５ａ，５ｂを交互に開閉する。 In the figure, 1 is a vacuum furnace, 2 is a workpiece stored in the vacuum furnace, 3 is a heater that heats the workpiece,
4 is a heat insulating material surrounding the heater 3. Openings 5a and 5b through which nitrogen gas flows out are provided at both ends of the heat insulating material. The openings 5a and 5b of the shielding plate 6
Covered alternately with a and 6b. That is, the shielding plate 6a,
6b is connected by a connecting rod 6c, and the cylinder 7
As a result, the openings 5a and 5b are alternately opened and closed as a result of being driven in conjunction with the openings 5a and 5b in the axial direction.
８は真空炉１内に導入された窒素ガスを循環さ
せる冷却フアンである。この冷却フアン８は駆動
モータ９によつて駆動される。冷却フアン駆動軸
は、例えば磁気シール等の真空シール１０によつ
て真空的にシールされている。したがつて、駆動
モータ９の周囲は略大気圧になつている。 8 is a cooling fan that circulates nitrogen gas introduced into the vacuum furnace 1. This cooling fan 8 is driven by a drive motor 9. The cooling fan drive shaft is vacuum sealed by a vacuum seal 10 such as a magnetic seal. Therefore, the pressure around the drive motor 9 is approximately atmospheric.
１１は炉内を流通する窒素ガスを冷却する冷却
器であつて、例えば図外の冷却水タンクに連結さ
れた金属パイプからなる熱交換器である。 Reference numeral 11 denotes a cooler for cooling nitrogen gas flowing through the furnace, and is, for example, a heat exchanger made of a metal pipe connected to a cooling water tank (not shown).
１２は断熱材４で覆われた処理室内へ窒素ガス
を送るためのガス流通路である。 Reference numeral 12 denotes a gas flow path for sending nitrogen gas into the processing chamber covered with the heat insulating material 4.
１３は開口５ａから流出した窒素ガスを冷却器
１１へ送るためのガス流通路、１４は処理室に窒
素ガスを噴射させるノズルであつて、この窒素ガ
スは炉外に設けてある窒素ガスボンベ１５より、
バルブ１７を介して前記ノズル１４に送られる。 13 is a gas flow path for sending the nitrogen gas flowing out from the opening 5a to the cooler 11, and 14 is a nozzle for injecting nitrogen gas into the processing chamber, and this nitrogen gas is supplied from a nitrogen gas cylinder 15 provided outside the furnace. ,
It is sent to the nozzle 14 via a valve 17.
１６はバルブ１８を介して真空炉１内を真空排
気する真空ポンプである。 Reference numeral 16 denotes a vacuum pump which evacuates the inside of the vacuum furnace 1 via a valve 18 .
１９は前記ヒータ３を駆動する加熱電源、２０
は真空ポンプ１６、バルブ１７，１８、加熱電源
１９の動作を制御する制御回路である。 19 is a heating power source for driving the heater 3; 20
is a control circuit that controls the operations of the vacuum pump 16, valves 17 and 18, and heating power source 19.
次に、上述した構成の真空焼入れ炉の動作説明
を行う。 Next, the operation of the vacuum hardening furnace configured as described above will be explained.
真空炉１内に処理物２を収納した後、真空ポ
ンプ１６によつて真空炉１内を１０-1torr程度
まで排気する。 After the workpiece 2 is placed in the vacuum furnace 1, the vacuum pump 16 evacuates the inside of the vacuum furnace 1 to about 10 -1 torr.
ヒータ３を駆動し、処理物２を所定の温度ま
で加熱する。 The heater 3 is driven to heat the processing object 2 to a predetermined temperature.
加熱完了と同時にバルブ１７を開放して窒素
ガスを真空炉１内に導入するが、冷却フアン８
は加熱完了の所定時間前に始動を開始してい
る。この時間は、加熱完了時に冷却フアン８の
回転数が最大となるように制御回路２０に予め
設定される。窒素ガスは、炉内の圧力が１〜10
Kg／cm2になるように導入される。 At the same time as the heating is completed, the valve 17 is opened to introduce nitrogen gas into the vacuum furnace 1, but the cooling fan 8
starts a predetermined time before the completion of heating. This time is preset in the control circuit 20 so that the number of rotations of the cooling fan 8 reaches the maximum when heating is completed. Nitrogen gas has a pressure in the furnace of 1 to 10
Kg/ cm2 .
冷却フアン８の回転数が最大値に達する直前
に加熱電源１９が遮断される。 Just before the rotational speed of the cooling fan 8 reaches its maximum value, the heating power source 19 is cut off.
シリンダ７により遮蔽板６ａ，６ｂを駆動す
ることにより、処理室内の窒素ガスを開口５
ａ，５ｂから交互に排出させる。即ち、開口５
ａが開いている場合、ノズル１４から処理室内
に流入された窒素ガスは開口５ａを介して処理
室外へ流出し、冷却器１１に送られる。一方、
開口５ｂが開いている場合、処理室内の窒素ガ
スは開口５ｂおよびガス流通路１３を介して冷
却器１１に送られる。 By driving the shielding plates 6a and 6b with the cylinder 7, nitrogen gas in the processing chamber is removed from the opening 5.
Discharge from a and 5b alternately. That is, the opening 5
When a is open, nitrogen gas that has flowed into the processing chamber from the nozzle 14 flows out of the processing chamber through the opening 5a and is sent to the cooler 11. on the other hand,
When the opening 5b is open, nitrogen gas within the processing chamber is sent to the cooler 11 via the opening 5b and the gas flow path 13.
処理室から排出された窒素ガスは冷却器１１
で冷却された後冷却フアンに流入し、ガス流通
路１２を介して再び処理室に向けて流出され
る。 Nitrogen gas discharged from the processing chamber is passed through the cooler 11
After being cooled, the gas flows into the cooling fan and flows out again toward the processing chamber via the gas flow path 12.
なお、上述の実施例では、２個の開口５ａ，５
ｂを処理室の前後に対向して設けるとして説明し
た。しかし、この考案はこれに限られるものでな
く、冷却速度が均一になるように２以上の開口を
処理室の適宜個所に設ける得るものである。 In addition, in the above-mentioned embodiment, two openings 5a, 5
In the above description, it is assumed that the spacers b are provided facing each other at the front and rear of the processing chamber. However, this invention is not limited to this, and two or more openings may be provided at appropriate locations in the processing chamber so that the cooling rate is uniform.
また、実施例の説明では、開口５ａ，５ｂを遮
蔽する遮蔽板６ａ，６ｂをシリンダ７によつて軸
方向に駆動して前記開口を交互に開閉した。しか
し、この開口を開閉する手段は、前述のものに限
られず例えば、遮蔽板６ａ，６ｂを交互に回転あ
るいは摺動させるものであつてもよいことは勿論
である。 Further, in the description of the embodiment, the shielding plates 6a and 6b that shield the openings 5a and 5b were driven in the axial direction by the cylinder 7 to alternately open and close the openings. However, the means for opening and closing this opening is not limited to the above-mentioned means, and it goes without saying that, for example, means for rotating or sliding the shielding plates 6a and 6b alternately may be used.
(ヘ) 効果
この考案に係る真空焼入れ炉は、処理室に設け
られた複数の開口部を所定の順序で開閉すること
によつて、処理室内の不活性ガスを室外へ排出し
ているので、処理室内の不活性ガスの流路が一定
になることはない。そのため、この考案によれ
ば、処理物に不活性ガスがかたよりなく当たるの
で、冷却速度が均一になり、焼入れのバラツキ及
び焼入れ歪を少なくすることができる。(F) Effect The vacuum quenching furnace according to this invention discharges the inert gas inside the processing chamber to the outside by opening and closing a plurality of openings provided in the processing chamber in a predetermined order. The flow path of the inert gas within the processing chamber is never constant. Therefore, according to this invention, since the inert gas evenly hits the object to be processed, the cooling rate becomes uniform, and it is possible to reduce variations in hardening and hardening distortion.
また冷却速度の均一化を図れることから、冷却
速度の速い加圧焼入れの場合に、この考案に係る
真空焼入れ炉は特にその効果を発揮する。 Furthermore, since the cooling rate can be made uniform, the vacuum hardening furnace according to this invention is particularly effective in the case of pressure hardening, which has a fast cooling rate.
第１図はこの考案の一実施例に係る真空焼入れ
炉の構成を略示した説明図、第２図は第１図のＡ
−Ａ断面図である。
１……真空炉、２……処理物、３……ヒータ、
４……断熱材、５ａ，５ｂ……開口、６ａ，６ｂ
……遮蔽板、７……シリンダ、８……冷却フア
ン、１１……冷却器。
FIG. 1 is an explanatory diagram schematically showing the structure of a vacuum hardening furnace according to an embodiment of this invention, and FIG.
-A sectional view. 1... Vacuum furnace, 2... Processing object, 3... Heater,
4...Insulating material, 5a, 5b...Opening, 6a, 6b
... Shielding plate, 7 ... Cylinder, 8 ... Cooling fan, 11 ... Cooler.
Claims (1)
で循環させることにより、加熱処理された処理物
を冷却して焼入れを行う真空焼入れ炉において、
処理物が収納される真空炉内の処理室に開閉自在
の開口部を複数個設け、前記開口部を所定の順序
で開閉することにより、流入された不活性ガスを
処理室外へ流出させることを特徴とする真空焼入
れ炉。 In a vacuum quenching furnace, a heat-treated workpiece is cooled and quenched by circulating an inert gas introduced into the vacuum furnace using a cooling fan.
A plurality of openable and closable openings are provided in a processing chamber in a vacuum furnace in which the processed material is stored, and by opening and closing the openings in a predetermined order, the inert gas that has flowed in can flow out of the processing chamber. Features a vacuum quenching furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13180384U JPS6147058U (en) | 1984-08-29 | 1984-08-29 | vacuum quenching furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13180384U JPS6147058U (en) | 1984-08-29 | 1984-08-29 | vacuum quenching furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6147058U JPS6147058U (en) | 1986-03-29 |
| JPS6342111Y2 true JPS6342111Y2 (en) | 1988-11-04 |
Family
ID=30690377
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13180384U Granted JPS6147058U (en) | 1984-08-29 | 1984-08-29 | vacuum quenching furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6147058U (en) |
-
1984
- 1984-08-29 JP JP13180384U patent/JPS6147058U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6147058U (en) | 1986-03-29 |
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