JPH059487B2 - - Google Patents
Info
- Publication number
- JPH059487B2 JPH059487B2 JP16317083A JP16317083A JPH059487B2 JP H059487 B2 JPH059487 B2 JP H059487B2 JP 16317083 A JP16317083 A JP 16317083A JP 16317083 A JP16317083 A JP 16317083A JP H059487 B2 JPH059487 B2 JP H059487B2
- Authority
- JP
- Japan
- Prior art keywords
- salt
- workpiece
- tempering
- temperature
- quenching
- 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 - Lifetime
Links
- 150000003839 salts Chemical class 0.000 claims description 54
- 238000005496 tempering Methods 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 12
- 238000010791 quenching Methods 0.000 claims description 12
- 230000000171 quenching effect Effects 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 238000007796 conventional method Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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
- C21D1/62—Quenching devices
- C21D1/63—Quenching devices for bath quenching
-
- 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
- C21D1/34—Methods of heating
- C21D1/44—Methods of heating in heat-treatment baths
- C21D1/46—Salt baths
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、ソルトを利用した焼入、焼戻し方法
に関するものである。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a quenching and tempering method using salt.
（従来技術）
従来方法による焼入焼戻しのライン構成を説明
すると、第１図において１はワークで、加熱炉２
により必要温度に加熱されて、次工程のソルト槽
３に移る。該ソルト槽３には、所定の温度に保た
れたソルト４が充填され、ワーク１はこのソルト
４中に浸漬、急冷されて焼入がなされる。(Prior art) To explain the line configuration for quenching and tempering according to the conventional method, in Fig. 1, 1 is a workpiece, and a heating furnace 2
The salt is heated to the required temperature and transferred to the next step, the salt bath 3. The salt tank 3 is filled with salt 4 maintained at a predetermined temperature, and the workpiece 1 is immersed in this salt 4, rapidly cooled, and hardened.
次いで、ソルト槽３から出されたワーク１は、
５の空冷部で、空気中に放置され、自然冷却され
る。 Next, the workpiece 1 taken out from the salt tank 3 is
In the air cooling section 5, it is left in the air and cooled naturally.
冷却の済んだワーク１は、洗浄部６でソルトが
洗浄された後、焼戻部６に入り、再度加熱されて
焼戻しが行われるのが通常である（特開昭57−
140820号公報参照）。 After cooling, the workpiece 1 is cleaned of salt in the washing section 6, and then enters the tempering section 6, where it is heated again and tempered.
(See Publication No. 140820).
しかしながら上記従来の方法では、焼入用加熱
炉２とは別に焼戻炉７を必要とし、その分、費用
とスペースが必要となり、特に少量生産の場合は
その負担が大き過ぎるという欠点があつた。 However, the conventional method described above requires a tempering furnace 7 in addition to the quenching heating furnace 2, which requires additional cost and space, which has the drawback of being too burdensome especially in the case of small-volume production. .
（発明の目的）
本発明は前記従来技術の問題点に鑑み、焼戻炉
を別途必要としない焼入、焼戻し方法を提供する
ことを目的とする。(Objective of the Invention) In view of the problems of the prior art, an object of the present invention is to provide a hardening and tempering method that does not require a separate tempering furnace.
（発明の構成）
前述の目的を達成するため、本発明にあつて
は、ソルト槽により焼入れのための冷却を行つた
後、この焼入れされたワークを、ソルト中から引
上げて該ソルト液面上方において例えばエアノズ
ルからのエアの噴射で強制空冷し、この後、ワー
クを再び上記ソルト槽内に浸漬して焼戻しを行う
ようにしてある。(Structure of the Invention) In order to achieve the above-mentioned object, in the present invention, after cooling for quenching in a salt bath, the quenched work is pulled out of the salt and placed above the salt liquid level. For example, the workpiece is forcedly cooled by air injection from an air nozzle, and then the workpiece is immersed in the salt bath again to perform tempering.
（実施例）
以下本発明による一実施例を第２図、第３図に
より説明する。(Example) An example according to the present invention will be described below with reference to FIGS. 2 and 3.
ソルト槽３内には、ワーク１の熱処理にもつと
も適した温度に加熱保温されたソルト４が調整、
充填され、該ソルト４の液面上方空間には、ソル
ト４より引き上げられたワーク１に向つてエアを
噴射できるようにエアノズル８が配設され、該エ
アノズル８は、図示を略すエアタンクより伸びる
エア配管９に接続されている。 In the salt tank 3, salt 4 is heated and kept at a temperature suitable for heat treatment of the workpiece 1.
An air nozzle 8 is disposed in the space above the liquid level of the salt 4, so that air can be injected toward the workpiece 1 lifted from the salt 4. It is connected to piping 9.
ワーク１は、前述した通常の方法と同様に、加
熱炉２中で規定温度に加熱されてソルト槽３に送
られて、該ワーク１はソルト４中に浸漬、急冷さ
れて焼入が行なわれる。 The work 1 is heated to a specified temperature in a heating furnace 2 and sent to a salt bath 3, and is immersed in salt 4 and rapidly cooled to undergo hardening, in the same way as in the conventional method described above. .
次いで、ソルト４中から引上げられたワーク１
は、そのままソルト４液面上の空間に宙吊りにさ
れた状態で保持される。この場合のワーク１の温
度は、ほぼソルト４の温度と同一である。 Next, the workpiece 1 pulled up from the salt 4
is kept suspended in the space above the salt 4 liquid level. The temperature of the workpiece 1 in this case is approximately the same as the temperature of the salt 4.
上記宙吊りにされたワーク１に対しては、エア
ノズル８から高圧エアが噴射されて、ワーク１は
冷却される。エア噴射の量及び時間は、ワーク１
の熱処理条件にもつとも適するように調整されて
いる。 High-pressure air is injected from the air nozzle 8 to the suspended work 1, and the work 1 is cooled. The amount and time of air injection are
It is adjusted to be suitable for the heat treatment conditions.
所定時間を経て、所定温度まで冷却されたワー
ク１は、再度ソルト４中に浸漬される。この再度
浸漬されたワーク１は、ソルト４の急速加熱能力
により、短時間でソルト４と略同一の温度に達し
た後、焼戻しに必要な時間そのままソルト中に保
持される。 After a predetermined period of time, the workpiece 1, which has been cooled to a predetermined temperature, is immersed in the salt 4 again. This re-immersed workpiece 1 reaches substantially the same temperature as the salt 4 in a short time due to the rapid heating ability of the salt 4, and is then held in the salt for the time required for tempering.
所定時間経過後、再加熱を終えたワーク１は、
前回同様にソルト槽３内の空間に宙吊りにされ、
エアノズル８からのエアの噴射により所定時間を
かけて冷却され、焼戻し処理が完了する。 After the predetermined time has passed, the workpiece 1 that has been reheated is
Just like last time, it was suspended in the space inside salt tank 3,
It is cooled over a predetermined period of time by air injection from the air nozzle 8, and the tempering process is completed.
このエアの噴射により、ワーク１に付着したソ
ルトの大半は、吹き落されて、ソルト槽３に落下
する。 By this air injection, most of the salt adhering to the workpiece 1 is blown off and falls into the salt tank 3.
次に、上述の工程の温度と時間との関係を第３
図により説明する。 Next, the relationship between temperature and time in the above process is explained in a third manner.
This will be explained using figures.
加熱されたワーク１が、ソルトに浸漬される時
点がＡ点である。 Point A is the point at which the heated workpiece 1 is immersed in salt.
ソルト４は、Ms点（鋼のオーステナイトがマ
ルテンサイトに変態し始める温度）よりも僅かに
高い温度STに保持されていて、ソルト４に浸漬
されたワーク１は、このソルト４の温度Ｂ点まで
急冷される。ワーク１は３〜５分間、そのままソ
ルト４内におかれ、ワーク１の温度が均一になつ
たＣ点でソルト４から引上げられる。 Salt 4 is held at a temperature ST slightly higher than the Ms point (the temperature at which austenite in steel begins to transform into martensite), and the workpiece 1 immersed in salt 4 reaches the temperature B of this salt 4. It is rapidly cooled. The workpiece 1 is left in the salt 4 for 3 to 5 minutes, and is pulled out of the salt 4 at point C, when the temperature of the workpiece 1 has become uniform.
ワーク１はここでエアノズル８からのエア噴射
によりMf点（前記Ms点で始まつたマルテンサイ
ト変態が終る温度）を越えたＤ点まで、比較的ゆ
るやかに冷却され焼入工程を完了する。 The workpiece 1 is then cooled relatively slowly by air injection from the air nozzle 8 to a point D, which exceeds the Mf point (the temperature at which the martensitic transformation that started at the Ms point ends), completing the quenching process.
Ｄ点でソルト４内に再浸漬されたワーク１はソ
ルト４の温度Ｅ点まで急速に上昇し、そのままの
状態でＦ点まで３〜10分間保持される。 The workpiece 1 re-immersed in the salt 4 at point D rapidly rises to the temperature of the salt 4 to point E, and is maintained in that state for 3 to 10 minutes until it reaches point F.
Ｆ点でソルト４から引上げられたワーク１は、
再度エア噴射を受けてほぼ常温のＧ点まで冷却さ
れ、焼戻し工程を完了する。 Work 1 pulled up from salt 4 at point F is
The material is again injected with air and cooled to point G, which is approximately room temperature, completing the tempering process.
第３図から判るように、マルテンサイト変態が
進行するMs−Mfの間が、比較的ゆるやかに冷却
されるので、焼割れを生じ難いという、マルクエ
ンチングの特徴を活かすと同時に、「焼入れ後な
るべく速やかに焼戻しを行う」という焼戻しのも
つとも好ましい条件にも適合しているわけであ
る。 As can be seen from Figure 3, the space between Ms and Mf, where martensitic transformation progresses, is cooled relatively slowly, making it difficult to cause quenching cracks. This also satisfies the most desirable conditions for tempering, which is to perform tempering as quickly as possible.
（発明の効果）
本発明は以上述べたことから明らかなように、
次のような種々の効果を奏する。(Effects of the Invention) As is clear from the above, the present invention has the following advantages:
It has various effects as follows.
(1) 同一ソルト槽内で、所要のサイクルタイム内
で、焼入、焼戻しの両方が実施でき燃焼炉を別
途設ける必要がなくなる。(1) Both quenching and tempering can be performed within the required cycle time in the same salt tank, eliminating the need for a separate combustion furnace.
(2) ソルトの液面上方位置でのエアノズルの噴射
により、従来ワークに付着してソルト槽外に持
出されていたソルトが、そのまま回収、節約さ
れる。(2) By spraying the air nozzle above the salt liquid level, the salt, which conventionally adheres to the workpiece and is taken out of the salt tank, is recovered and saved.
(3) ソルト槽を従来方法のように焼入のみに使用
した場合、ソルトの温度が高くなり過ぎる傾向
があつたが、本発明方法では、強制空冷されて
温度の下つたワークが再浸漬されるため、ソル
トを冷却する効果がある。(3) When the salt bath was used only for quenching as in the conventional method, the temperature of the salt tended to become too high, but in the method of the present invention, the workpiece whose temperature has dropped due to forced air cooling is re-immersed. This has the effect of cooling the salt.
(4) ワークは既に冷却された状態でソルト槽から
出るために、洗浄工程に移る際の空冷時間を必
要とせず、この部分でのワークのストツクを減
少することができる。(4) Since the workpiece leaves the salt bath in a cooled state, no air cooling time is required when moving on to the cleaning process, and the stock of the workpiece in this area can be reduced.
第１図は従来方法による焼入、焼戻しのライン
構成を示す平面図。第２図は本発明方法に用いる
ソルト槽の一例を示す縦断面図。第３図は、本発
明方法における熱処理のための温度と時間との関
係を表すグラフ。
１……ワーク、２……加熱炉、３……ソルト
槽、４……ソルト、８……エアノズル。
FIG. 1 is a plan view showing a line configuration for quenching and tempering according to a conventional method. FIG. 2 is a longitudinal sectional view showing an example of a salt tank used in the method of the present invention. FIG. 3 is a graph showing the relationship between temperature and time for heat treatment in the method of the present invention. 1...Work, 2...Heating furnace, 3...Salt tank, 4...Salt, 8...Air nozzle.
Claims (1)
方法であつて、 加熱されたワークをソルト中に浸漬して焼入れ
する工程と、 前記ソルト中から引上げられたワークを該ソル
トの液面上方位置で強制空冷する工程と、 前記強制空冷されたワークを再度前記ソルト中
に浸漬加熱して焼戻しを行う工程と、 前記ソルト中から引上げられたワークを、再度
該ソルトの液面上方位置で強制空冷する工程と、 を備えていることを特徴とする同一ソルト槽によ
る焼入、焼戻し方法。[Claims] 1. A quenching and tempering method using salt as a heat treatment liquid, comprising the steps of immersing a heated workpiece in the salt and quenching it; A step of forcibly cooling the workpiece above the liquid level; a step of tempering the workpiece by immersing it in the salt again and heating it; and placing the workpiece pulled up from the salt again above the liquid level of the salt. A method for quenching and tempering using the same salt tank, characterized by comprising: a step of forced air cooling at a certain point;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16317083A JPS6056015A (en) | 1983-09-07 | 1983-09-07 | Hardening and tempering method by same salt vessel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16317083A JPS6056015A (en) | 1983-09-07 | 1983-09-07 | Hardening and tempering method by same salt vessel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6056015A JPS6056015A (en) | 1985-04-01 |
| JPH059487B2 true JPH059487B2 (en) | 1993-02-05 |
Family
ID=15768566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16317083A Granted JPS6056015A (en) | 1983-09-07 | 1983-09-07 | Hardening and tempering method by same salt vessel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6056015A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104846157B (en) * | 2015-03-31 | 2017-02-01 | 常州天山重工机械有限公司 | Tempering technology for high-precision high-speed heavy-duty gear salt bath quenching |
-
1983
- 1983-09-07 JP JP16317083A patent/JPS6056015A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6056015A (en) | 1985-04-01 |
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