JPH0125373B2 - - Google Patents
Info
- Publication number
- JPH0125373B2 JPH0125373B2 JP59212129A JP21212984A JPH0125373B2 JP H0125373 B2 JPH0125373 B2 JP H0125373B2 JP 59212129 A JP59212129 A JP 59212129A JP 21212984 A JP21212984 A JP 21212984A JP H0125373 B2 JPH0125373 B2 JP H0125373B2
- Authority
- JP
- Japan
- Prior art keywords
- piece
- bending
- hardened
- workpiece
- amount
- 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
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
- C21D1/06—Surface hardening
- C21D1/09—Surface hardening by direct application of electrical or wave energy; by particle radiation
- C21D1/10—Surface hardening by direct application of electrical or wave energy; by particle radiation by electric induction
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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 Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
(イ) 産業上の利用分野
本発明は、直線レール等の高周波焼入後の曲が
りを最小にするための高周波焼入方法に関する。DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an induction hardening method for minimizing bending of a straight rail or the like after induction hardening.
(ロ) 従来技術
一般に焼入をした場合は、被焼入材料片が曲が
ることがある。この曲がりの方向は早く冷却され
た所が凸となる傾向がある。そこで被焼入材料片
の曲がりを矯正するために従来は次のような方法
で行つていた。(b) Prior art Generally, when hardening is performed, a piece of material to be hardened may be bent. The direction of this bend tends to be convex where it is cooled quickly. Therefore, in order to correct the bending of a piece of material to be hardened, the following method has conventionally been used.
従来の高周波焼入方法は、焼入を施した後、仕
上げ研磨工程前に焼入によつて生じた曲がりを矯
正するのに全工程中最も不安定、且つ不良率の高
い作業を実施していた。例えば、被焼入材料片の
直線レールの断面が25×25mmであり、長さが1000
mmであつた場合、直線レールは約８〜12mmも曲が
ることになる。このような曲がりは、研磨前にお
いて0.2〜0.3mm程度まで強制的に加重を加えるこ
とにより、矯正しなければならない。勿論、この
ような矯正は一工程で行うことが不可能な場合も
多く、このような時には粗矯正後残留応力の除去
も兼ねて160〜180℃の低温に昇温を保持した後に
再度矯正しなければならない。又、曲がり量の多
い被焼入材料片を矯正すると、被焼入材料片が折
損する危険性があつた。 In the conventional induction hardening method, after hardening, the process of straightening the bends caused by hardening before the final polishing process is the most unstable of all processes and has a high defect rate. Ta. For example, the cross section of the straight rail of the piece of material to be hardened is 25 x 25 mm, and the length is 1000 mm.
mm, the straight rail will bend by about 8 to 12 mm. Such bending must be corrected by forcibly applying a load of about 0.2 to 0.3 mm before polishing. Of course, it is often impossible to perform such straightening in one step, and in such cases, after rough straightening, the temperature is maintained at a low temperature of 160 to 180°C, which also serves to remove residual stress, and then straightened again. There must be. Furthermore, when a piece of material to be hardened that has a large amount of bending is straightened, there is a risk that the piece of material to be hardened will break.
(ハ) 目的
本発明は、前述の技術的課題を解決し、被焼入
材料片の曲がりを最小にして焼入処理を行うこと
ができる高周波焼入方法を提供することを目的と
する。(C) Purpose It is an object of the present invention to provide an induction hardening method that solves the above-mentioned technical problems and can perform hardening treatment while minimizing bending of a piece of material to be hardened.
(ニ) 構成
本発明は、略四角断面形状を有する被焼入材料
片の長手方向に高周波移動焼入処理を施す際、焼
入中の前記被焼入材料片のＸ，Ｙ軸方向の曲がり
を連続的に計測して、その計測値により前記被焼
入材料片の四面に相対する各冷却器の冷却液量を
被焼入材料片の曲がり方向と曲がりの量とに応じ
て調節し、焼入後の前記被焼入材料片の曲がりを
修正することを特徴とする高周波焼入方法であ
る。(D) Structure The present invention provides a method for preventing bending of the material to be quenched in the X and Y axis directions during quenching when performing high-frequency movement quenching in the longitudinal direction of a piece of material to be quenched having a substantially square cross-sectional shape. is continuously measured, and based on the measured values, the amount of cooling liquid in each cooler facing the four sides of the piece of material to be quenched is adjusted according to the bending direction and amount of the piece of material to be quenched, This is an induction hardening method characterized by correcting the bending of the piece of material to be hardened after hardening.
(ホ) 実施例
第１図ａは、本発明の一実施例のブロツク図を
示す。第１図ｂは、第１図ａに示すワーク１の断
面を示す。(E) Embodiment FIG. 1a shows a block diagram of an embodiment of the present invention. FIG. 1b shows a cross section of the workpiece 1 shown in FIG. 1a.
第１図ａに於いて、ワーク１は被焼入材料片の
直線レール等であり、略四角断面形状を有する。
このワーク１は、第１図ａに示すように矢符Ａの
方向に移動する。１１は高周波焼入用コイルであ
つて、第１冷却器を兼ねている。すなわちコイル
１１を還流する冷却液はコイル内面にあるノズル
孔１１１から外部に向かつて噴出し、この噴出し
た冷却液が前記ワーク１の表面を冷却するように
なつている。センサ９は、耐熱性を有する例えば
セラミツクスからなる検出器８によりワーク１の
第１図ｂに示すＹ軸方向の曲がりを検出する。セ
ンサ１３は、検出部１２によりワーク１の第１図
ｂに示すＸ軸方向の曲がりを検出する。第２冷却
器２には、電磁弁４を介してポンプ１４からの液
体が供給される。第２冷却器３には電磁弁６を介
してポンプ１５からの液体が供給される。制御手
段１０はセンサ９，１３からの信号により電磁弁
駆動手段５，７を動作させ、電磁弁４，６を駆動
させる。なお、前記第２冷却器はワーク１の４面
に設けられているので４台あるものとする。 In FIG. 1a, a workpiece 1 is a straight rail or the like of a piece of material to be hardened, and has a substantially square cross-sectional shape.
This work 1 moves in the direction of arrow A as shown in FIG. 1a. Reference numeral 11 is an induction hardening coil, which also serves as a first cooler. That is, the cooling liquid flowing back through the coil 11 is jetted outward from a nozzle hole 111 on the inner surface of the coil, and the jetted cooling liquid cools the surface of the workpiece 1. The sensor 9 detects the bending of the workpiece 1 in the Y-axis direction as shown in FIG. 1b using a detector 8 made of heat-resistant ceramics, for example. The sensor 13 detects the bending of the workpiece 1 in the X-axis direction as shown in FIG. 1b by the detection unit 12. The second cooler 2 is supplied with liquid from a pump 14 via a solenoid valve 4 . The second cooler 3 is supplied with liquid from a pump 15 via a solenoid valve 6 . The control means 10 operates the electromagnetic valve driving means 5 and 7 based on the signals from the sensors 9 and 13, thereby driving the electromagnetic valves 4 and 6. Note that since the second coolers are provided on four sides of the workpiece 1, there are four second coolers.
ここで本発明の高周波焼入方法を説明する。 Here, the induction hardening method of the present invention will be explained.
第１図ａに於いて矢符Ａに示す方向にワーク１
が移動し、第１冷却器１１によりワーク１の表面
が所定温度加熱され、第１冷却器１１から噴出し
た冷却液で冷却される。次にセンサ９によりワー
ク１のＹ軸方向の曲がりを検出し、センサ１３に
よりワーク１のＸ軸方向の曲がりを検出する。制
御手段１０は、センサ９及びセンサ１３の検出信
号により第２冷却器２及び３の液量を調節するた
めに電磁弁駆動手段５及び７を制御する。 Workpiece 1 in the direction shown by arrow A in Figure 1a.
moves, the surface of the workpiece 1 is heated to a predetermined temperature by the first cooler 11, and is cooled by the cooling liquid spouted from the first cooler 11. Next, the sensor 9 detects the bending of the workpiece 1 in the Y-axis direction, and the sensor 13 detects the bending of the workpiece 1 in the X-axis direction. The control means 10 controls the electromagnetic valve driving means 5 and 7 in order to adjust the liquid amount in the second coolers 2 and 3 based on the detection signals of the sensors 9 and 13.
ここで第２図を参照してワーク１の曲がり状態
を説明する。例えば、ワーク１が第２図に示すよ
うに曲がつたと仮定する。このような方向に曲が
るのは、ワーク１の表面２１の温度が表面２２の
温度より低くなつた場合に起きる。従つて、この
ような曲がりを修正するためにワーク１の表面２
２側に設けてある第２冷却器３から噴出する冷却
液の量を表面２１に設けてある第２冷却器２から
の冷却液の量よりも多くする。このようにして曲
がりを修正されたワーク１は、次の工程である仕
上げ研磨工程に移る。 Here, the bent state of the workpiece 1 will be explained with reference to FIG. For example, assume that the workpiece 1 is bent as shown in FIG. Bending in such a direction occurs when the temperature of the surface 21 of the work 1 becomes lower than the temperature of the surface 22. Therefore, in order to correct such bending, the surface 2 of the workpiece 1
The amount of cooling liquid spouted from the second cooler 3 provided on the surface 21 is made larger than the amount of cooling liquid ejected from the second cooler 2 provided on the surface 21. The workpiece 1 whose curvature has been corrected in this way is moved to the next step, a final polishing step.
なお、第１図ａに示すセンサ９，１３は高周波
タイプの近接スイツチ或いは差動トランスを用い
てもよい。 Incidentally, the sensors 9 and 13 shown in FIG. 1A may be a high frequency type proximity switch or a differential transformer.
(ヘ) 効果
本発明によれば、被焼入材料片の四面に相対す
る各冷却器の冷却液量を被焼入材料片の曲がりの
方向と曲がりの量とに応じて調節することによ
り、焼入後の被焼入材料片の曲がりを最小にする
ことができる。(f) Effects According to the present invention, by adjusting the amount of cooling fluid in each cooler facing the four sides of the piece of material to be quenched depending on the direction and amount of bending of the piece of material to be quenched, The bending of the piece of material to be hardened after hardening can be minimized.
第１図ａは本発明の一実施例のブロツク図、第
１図ｂはワーク１の断面図、第２図はワーク１の
曲がりの状態を説明するための図である。
１……ワーク、２，３……第２冷却器、４，６
……電磁弁、５，７……電磁弁駆動手段、８，１
２……検出部、９，１３……センサ、１０……制
御手段、１１……高周波焼入用コイル、１４，１
５……ポンプ。
FIG. 1a is a block diagram of an embodiment of the present invention, FIG. 1b is a sectional view of the workpiece 1, and FIG. 2 is a diagram for explaining the bending state of the workpiece 1. 1... Workpiece, 2, 3... Second cooler, 4, 6
... Solenoid valve, 5, 7 ... Solenoid valve driving means, 8, 1
2... Detection unit, 9, 13... Sensor, 10... Control means, 11... Induction hardening coil, 14, 1
5...Pump.
Claims (1)
方向に高周波移動焼入処理を施す際、焼入中に前
記被焼入材料片のＸ，Ｙ軸方向の曲がりを連続的
に計測して、その計測値により前記被焼入材料片
の４面に相対する各冷却器の冷却液量を被焼入材
料片の曲がりの方向と曲がりの量とに応じて調節
し、焼入後の前記被焼入材料片の曲がりを修正す
ることを特徴とする高周波焼入方法。1. When performing high-frequency movement hardening treatment in the longitudinal direction of a piece of material to be hardened that has a substantially square cross-sectional shape, the bending of the piece of material to be hardened in the X and Y axis directions is continuously measured during quenching. Based on the measured values, the amount of cooling liquid in each cooler facing the four sides of the piece of material to be quenched is adjusted according to the direction and amount of bending of the piece of material to be quenched, and the An induction hardening method characterized by correcting the bending of a piece of material to be hardened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59212129A JPS6191324A (en) | 1984-10-08 | 1984-10-08 | Induction hardening method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59212129A JPS6191324A (en) | 1984-10-08 | 1984-10-08 | Induction hardening method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6191324A JPS6191324A (en) | 1986-05-09 |
| JPH0125373B2 true JPH0125373B2 (en) | 1989-05-17 |
Family
ID=16617370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59212129A Granted JPS6191324A (en) | 1984-10-08 | 1984-10-08 | Induction hardening method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6191324A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5433800A (en) * | 1987-08-17 | 1995-07-18 | Arthur E. Bishop & Associates Pty, Ltd. | Scanning induction hardening |
| DE3885265T2 (en) * | 1987-08-17 | 1994-02-17 | Bishop A E | MONITORING OF LEVELNESS IN GRID STEEL INDUCTION TEMPERATION. |
| KR910700357A (en) * | 1989-02-13 | 1991-03-14 | 존 박스터 | Improvement of injection-induced hardening |
-
1984
- 1984-10-08 JP JP59212129A patent/JPS6191324A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6191324A (en) | 1986-05-09 |
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