JPH0341528B2 - - Google Patents
Info
- Publication number
- JPH0341528B2 JPH0341528B2 JP18808086A JP18808086A JPH0341528B2 JP H0341528 B2 JPH0341528 B2 JP H0341528B2 JP 18808086 A JP18808086 A JP 18808086A JP 18808086 A JP18808086 A JP 18808086A JP H0341528 B2 JPH0341528 B2 JP H0341528B2
- Authority
- JP
- Japan
- Prior art keywords
- rail
- coil
- frequency induction
- heating coil
- frequency
- 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
- 238000010438 heat treatment Methods 0.000 claims description 88
- 230000006698 induction Effects 0.000 claims description 34
- 238000000034 method Methods 0.000 claims description 17
- 230000000694 effects Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Landscapes
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
ａ 産業上の利用分野
本発明は、鉄道軌道等に使用されるレールを高
周波誘導加熱コイルにて加熱する方法に関し、さ
らに詳しくは、断面が漸変するレール頭部を焼入
れ等のために高周波誘導加熱する方法に関するも
のである。Detailed Description of the Invention: a. Field of Industrial Application The present invention relates to a method for heating rails used on railway tracks, etc. using high-frequency induction heating coils, and more specifically, relates to a method for heating rails used on railway tracks, etc. using high-frequency induction heating coils. This invention relates to a method of high-frequency induction heating for hardening and the like.
ｂ 従来の技術
鉄道軌道等に使用されるレールには、大別し
て、頭部断面が一定な定尺レール１（第４図参
照）と、分岐器や軌道伸縮継目等に使用されるト
ングレールやガードレール等の如く頭部断面が長
手方向及び上下方向に亘つて漸変するいわゆるＰ
レール（ポイント・レール）２（第５図参照）が
ある。この種のレール１，２の製造に際しては、
多くの場合、頭部１ａ，２ａの表面強化のために
焼入処理を施こす必要がある。b. Conventional technology Rails used for railway tracks, etc. can be roughly divided into standard length rails 1 with a constant head section (see Figure 4), and tongue rails and rails used for turnouts, track expansion joints, etc. The so-called P where the cross section of the head gradually changes in the longitudinal direction and the vertical direction, such as in guardrails, etc.
There is a rail (point rail) 2 (see Figure 5). When manufacturing this type of rails 1 and 2,
In many cases, it is necessary to perform a hardening treatment to strengthen the surfaces of the heads 1a and 2a.
定尺レール１の頭部１ａを焼入処理するための
加熱方法としては、高周波誘導加熱コイルを用い
た方法が従来より確立されている。従来では、第
４図に示すように、高周波誘導加熱コイル３を定
尺レール１の頭部１ａから所定の間隔を隔てた位
置に配設し、これら両者を前記定尺レール１の長
手方向に沿つて相対的に移動させることにより、
頭部１ａをその長手方向の全体に亘つて高周波誘
導加熱するようにしている。ところで、従来より
用いられている前記加熱コイル３は、直方体の所
定の辺部に沿つて延びる一連の連続構成体から成
り、互いに対向して平行状に延びる一対のコイル
辺部４ａ，４ｂと、コイル辺部４ａ，４ｂに対し
て直交する方向に延びる一対のコイル辺部５ａ，
５ｂと、これらのコイル辺部４ａ，４ｂ及び５
ａ，５ｂの端部間に配設された４つのコイル辺部
６ａ，６ｂ，６ｃ，６ｄとから構成されている。
そして、コイル辺部４ａ，４ｂはレール１の頭部
１ａの両側面１ｂに対応するようにレール１の長
手方向に沿つて平行に配設される一方、コイル辺
部５ａ，５ｂは、前記頭部１ａの頂面１ｃに対応
するようにレール１の長手方向と直交する方向に
沿つて配置されるようになつている。なお、加熱
コイル３には、高周波電源７から所定周波数の高
周波誘導電流が供給されるようになつている。 As a heating method for hardening the head portion 1a of the fixed-length rail 1, a method using a high-frequency induction heating coil has been conventionally established. Conventionally, as shown in FIG. 4, a high-frequency induction heating coil 3 is arranged at a position separated by a predetermined distance from the head 1a of the fixed-length rail 1, and both of them are connected in the longitudinal direction of the fixed-length rail 1. By moving relatively along the
The head 1a is heated by high frequency induction over the entire length thereof. By the way, the heating coil 3 conventionally used consists of a series of continuous structures extending along predetermined sides of a rectangular parallelepiped, and includes a pair of coil sides 4a and 4b facing each other and extending in parallel; a pair of coil sides 5a extending in a direction orthogonal to the coil sides 4a, 4b;
5b, and these coil sides 4a, 4b and 5
It is composed of four coil sides 6a, 6b, 6c, and 6d arranged between the ends of coils a and 5b.
The coil sides 4a and 4b are arranged in parallel along the longitudinal direction of the rail 1 so as to correspond to both side surfaces 1b of the head 1a of the rail 1, while the coil sides 5a and 5b It is arranged along the direction perpendicular to the longitudinal direction of the rail 1 so as to correspond to the top surface 1c of the portion 1a. Note that the heating coil 3 is supplied with a high frequency induced current of a predetermined frequency from a high frequency power source 7.
しかして、定尺レール１の頭部１ａを加熱する
場合には、定尺レール１と加熱コイル３とを第４
図に示す如き対応関係をもつて配置し、加熱コイ
ル３に電源７から高周波誘導電流を供給すると共
に、例えば定尺レール１をその長手方向に沿つて
矢印Ａ方向に移動させる。これにより、定尺レー
ル１の頭部１ａは、加熱コイル３との間に生じる
近接効果にて、その長手方向の全体に亘つて高周
波誘導加熱される。 Therefore, when heating the head 1a of the fixed length rail 1, the fixed length rail 1 and the heating coil 3 are
The heating coils 3 are arranged in a corresponding relationship as shown in the figure, and a high frequency induced current is supplied from a power source 7 to the heating coil 3, and the fixed length rail 1 is moved, for example, in the direction of arrow A along its longitudinal direction. As a result, the head 1a of the fixed-length rail 1 is heated by high-frequency induction over the entire length thereof due to the proximity effect generated between the head 1a and the heating coil 3.
定尺レール１に関しては、その長手方向の全て
の箇所での断面形状が一定であるため、定尺レー
ル１が移動しても加熱コイル３と定尺レール１の
両側面１ｂ及び頭頂面１ｃとの間の間隔は常に一
定である。そのため、定尺レール１の頭部１ａを
上述の加熱コイル３にて均一に高周波誘導加熱す
ることができる。 Regarding the fixed length rail 1, since the cross-sectional shape at all points in the longitudinal direction is constant, even if the fixed length rail 1 moves, the heating coil 3 and both side surfaces 1b and top surface 1c of the fixed length rail 1 The interval between is always constant. Therefore, the head portion 1a of the fixed-length rail 1 can be uniformly heated by high-frequency induction using the heating coil 3 described above.
ｃ 発明が解決しようとする問題点
しかしながら、Ｐレール２に関しては、その頭
部２ａの断面形状が第６図、第７図及び第８図に
示すようにレール２の長手方向の各々の箇所で漸
変するため、定尺レール１の場合のような従来の
高周波誘導加熱方法では、均一な加熱を行なうこ
とができなかつた。c Problems to be Solved by the Invention However, regarding the P rail 2, the cross-sectional shape of the head 2a is different from each other in the longitudinal direction of the rail 2, as shown in FIGS. 6, 7, and 8. Because of the gradual change, the conventional high-frequency induction heating method as in the case of the fixed-length rail 1 could not achieve uniform heating.
すなわち、第９図に示すようにＰレール２の頭
部２ａを単に加熱コイル３内を通過させるだけで
は、頭部２ａのうち頭巾が狭い先端箇所（巾狭部
９ａ）に対しては、頭部２ａの片方の側面８（鉄
道車両の車輪が当接する側の面）と加熱コイル３
のコイル辺部４ａ，６ａ，６ｂとの間のギヤツプ
が過大となつて両者間の電気的結合が非常に悪く
なり、ひいては加熱効率が大巾に低減されるた
め、所定の温度（例えば、800℃）以上の加熱に
必要な高周波電力を投入できないという問題点が
あつた。なお、あえて高周波電力を増加せしめる
と、加熱コイル３における損失が大巾に増大し
て、加熱コイル３の損傷を招いてしまうこととな
る。 That is, if the head 2a of the P rail 2 is simply passed through the heating coil 3 as shown in FIG. One side 8 of the portion 2a (the side that the wheels of the railway vehicle come into contact with) and the heating coil 3
If the gap between the coil sides 4a, 6a, 6b becomes excessive, the electrical coupling between them will become very poor, and the heating efficiency will be greatly reduced. There was a problem in that it was not possible to input the high frequency power necessary for heating above 30°F (°C). Note that if the high frequency power is intentionally increased, the loss in the heating coil 3 will increase significantly, leading to damage to the heating coil 3.
また、レール頭部の加熱処理工程における所望
加熱深さ及び加熱温度に関しては、一般に、その
表面より15mm以上の範囲を800℃以上の温度に加
熱することが必須不可欠の条件である。この条件
を満足するためには、高周波誘導電流のいわゆる
「深透深さ」が約15mm前後となる周波数（約1K
Hz）の電源を選定するのが最適である。しかしＰ
レール２の先端の巾狭部９ａの肉厚（頭頂巾）ｔ
は例えば最小で１mm程度と小さいため、上述のよ
うな周波数1KHzの電源では、第１０図に示す如
く臨界周波数以下となり800℃以上の高周波誘導
加熱を施すことができない。このため、Ｐレール
２の全長に亘つて例えば1KHzの同一周波数の電
源で800℃以上に均一加熱することが不可能であ
つた。 Furthermore, regarding the desired heating depth and heating temperature in the heat treatment process for the rail head, it is generally essential to heat an area 15 mm or more from the surface to a temperature of 800° C. or more. In order to satisfy this condition, the frequency at which the so-called "deep penetration depth" of the high-frequency induced current is approximately 15 mm (approximately 1K
It is best to select a power source with a high frequency (Hz). However, P
Thickness of the narrow part 9a at the tip of the rail 2 (top width) t
is small, for example, about 1 mm at the minimum, so with a power source with a frequency of 1 KHz as described above, the frequency becomes below the critical frequency, as shown in FIG. 10, and high frequency induction heating of 800° C. or higher cannot be performed. For this reason, it has been impossible to uniformly heat the P-rail 2 over its entire length to 800° C. or higher using a power source with the same frequency of, for example, 1 KHz.
本発明は上述の如き実状に鑑みてなされたもの
であつて、その目的はＰレールの如く頭部断面形
状が漸変するものであつても、常に均一加熱をす
ることが可能なレールの高周波誘導加熱方法を提
供することにある。 The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a high frequency rail that can constantly heat uniformly even when the cross-sectional shape of the head section changes gradually, such as the P rail. An object of the present invention is to provide an induction heating method.
ｄ 問題点を解決するための手段
上述の如き問題点を解決するために、本発明で
は、頭部断面が漸変するレールと高周波誘導加熱
コイルとを相対移動させることによつて前記レー
ルの頭部を高周波誘導加熱するに際し、前記レー
ルの頂面及び片方の側面と前記加熱コイルとの間
のギヤツプを常に一定に保持するようにしてい
る。d Means for Solving the Problems In order to solve the above-mentioned problems, in the present invention, the head of the rail is moved relatively to the rail whose head section gradually changes and the high-frequency induction heating coil. When performing high-frequency induction heating on the rail, a gap between the top surface and one side surface of the rail and the heating coil is always kept constant.
以下、本発明の一実施例に付き第１図〜第３図
を参照して説明する。 Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.
第１図は、本発明に係る加熱方法を実施する高
周波誘導加熱装置１０を示すものであつて、本装
置１０は、一連の連続構成体から成る高周波誘導
加熱コイル１１と、この加熱コイル１１に1KHz
の周波数の高周波誘導電流を供給する高周波電源
１２と、加熱コイル１１をＰレール１３の巾方向
（矢印Ｂ方向）に水平移動可能に支持するロー
ラ・アセンブリ１４とから構成されている。 FIG. 1 shows a high-frequency induction heating device 10 for carrying out the heating method according to the present invention. 1KHz
The roller assembly 14 includes a high-frequency power source 12 that supplies a high-frequency induced current with a frequency of
上述の加熱コイル１１は、Ｐレール１３の頭部
１３ａの両側面１５，１６に対して平行に対応配
置される直線状のコイル辺部１１ａ，１１ｂと、
これらのコイル辺部１１ａ，１１ｂの各両端にお
いてほぼ直角に上方へ向けて屈曲されたコイル辺
部１１ｃ，１１ｄ及び１１ｅ，１１ｆと、前記頭
部１３ａの頂面１７に対応するようにこれらのコ
イル辺部１１ｃ〜１１ｆの上端において互いに近
づく方向にほぼ直角に屈曲された等長のコイル辺
部１１ｇ，１１ｈ及び１１ｉ，１１ｊと、Ｐレー
ル１３の長手方向に沿つて前記頂面１７と対向す
るようにコイル辺部１１ｇ，１１ｊの他端におい
て互いに近づく方向にほぼ直角に屈曲されたコイ
ル辺部１１ｋ，１１ｌと、コイル辺部１１ｈ，１
１ｉの他端においてほぼ直角に屈曲されて前記頂
面１７に対向して平行に延びる等長のコイル辺部
１１ｍ，１１ｎと、これらのコイル辺部１１ｍ，
１１ｎに連続しかつ前記コイル辺部１１ｍ，１１
ｎの先端間を斜めに横切るコイル辺部１１ｐとか
ら構成されている。そして、前記コイル辺部１１
ｋ，１１ｌの先端に高周波電源１２のリード線１
２ａ，１２ｂが接続されており、この電源１２か
ら加熱コイル１１に1KHzの周波数の高周波誘導
電流が供給されるようになつている。 The heating coil 11 described above has linear coil side portions 11a and 11b arranged parallel to both side surfaces 15 and 16 of the head 13a of the P rail 13,
Coil side portions 11c, 11d and 11e, 11f bent upward at substantially right angles at both ends of these coil side portions 11a, 11b, and coil side portions 11e, 11f bent upward at a substantially right angle at both ends of the coil side portions 11a, 11b, and coil side portions 11e, 11f bent upward at substantially right angles, and coil side portions 11c, 11d and 11e, 11f bent upward at a substantially right angle at both ends of the coil side portions 11a, 11b, and coil side portions 11e, 11f bent upward at substantially right angles. Coil side portions 11g, 11h and 11i, 11j of equal length bent approximately at right angles in the direction approaching each other at the upper ends of the side portions 11c to 11f, and facing the top surface 17 along the longitudinal direction of the P rail 13. At the other ends of the coil sides 11g and 11j, the coil sides 11k and 11l are bent at a substantially right angle in the direction toward each other, and the coil sides 11h and 1
coil sides 11m and 11n of equal length bent at a substantially right angle at the other end of 1i and extending parallel to the top surface 17;
11n and the coil side portions 11m, 11
The coil side portion 11p diagonally crosses between the tips of the coils 11 and 11p. Then, the coil side portion 11
Connect the lead wire 1 of the high frequency power supply 12 to the tip of k, 11l.
2a and 12b are connected, and a high frequency induced current having a frequency of 1 KHz is supplied from this power source 12 to the heating coil 11.
一方、上述のローラ・アセンブリ１４は、一対
の回転ローラ１８，１９にて構成されており、こ
れらの回転ローラ１８，１９は圧縮空気又は油圧
によつて鉄道車両の車輪のフランジが当接する側
のＰレール１３の側面１５及び頂面１７に附勢力
f1，f2にてそれぞれ転動自在に圧着されている。
なお、ローラ・アセンブリ１４と加熱コイル１１
とは図外の連結部材にて一体的に連結されてい
る。また、本実施例においては、高周波電源１２
から供給される高周波電力、及びＰレール１３の
移動速度を数段階に切換えるための制御機構（図
示せず）が設けられており、Ｐレール１３の形状
及び材質等に応じてこれらを適宜選定できるよう
になつている。 On the other hand, the above-mentioned roller assembly 14 is composed of a pair of rotating rollers 18 and 19, and these rotating rollers 18 and 19 are moved by compressed air or hydraulic pressure to the side where the flanges of the wheels of the railway vehicle come into contact. Additional forces are attached to the side surface 15 and top surface 17 of the P rail 13.
They are crimped at f 1 and f 2 so that they can roll freely.
Note that the roller assembly 14 and the heating coil 11
are integrally connected to each other by a connecting member not shown. In addition, in this embodiment, the high frequency power supply 12
A control mechanism (not shown) is provided for switching the high-frequency power supplied from the P-rail 13 and the moving speed of the P-rail 13 into several stages, and these can be appropriately selected depending on the shape and material of the P-rail 13. It's becoming like that.
次に、このような構成の高周波誘導加熱装置１
０を用いてＰレール１３を加熱する方法に付き説
明する。 Next, the high frequency induction heating device 1 having such a configuration will be described.
A method of heating the P rail 13 using P rail 13 will be explained below.
まず、加熱すべきＰレール１３を第１図に示す
ように本装置１０に対応配置する。すなわち、加
熱コイル１１のコイル辺部１１ａ，１１ｂ間にＰ
レール１３の頭部１３ａを配置すると共に、第２
図ａ，ｂに示すように、回転ローラ１８及び１９
を前記頭部１３ａの側面１５及び頂面１７に圧着
係合させた状態とする。これによつて、Ｐレール
１３に対する加熱コイル１１の相対位置が規制さ
れるため、第３図ａ，ｂに示すように、加熱コイ
ル１１のコイル辺部１１ａはＰレール１３の側面
１５に対して所定のギヤツプL1（例えば５〜12
mm）をもつて対応配置され、加熱コイル１１のコ
イル辺部１１ｍ，１１ｋ等は、Ｐレール１３の頂
面１７に対して高さ方向に所定のギヤツプL2（５
〜20mm）をもつて対応配置される。しかして、高
周波電源１２から加熱コイル１１に1KHzの周波
数の高周波誘導電流を供給すると共に、Ｐレール
１３をその長手方向（矢印Ａ方向）に沿つて移動
させることにより、Ｐレール１３の頂部１３ａを
高周波誘導加熱する。 First, the P rail 13 to be heated is placed in the apparatus 10 as shown in FIG. That is, P between the coil sides 11a and 11b of the heating coil 11
While arranging the head 13a of the rail 13, the second
As shown in figures a and b, rotating rollers 18 and 19
are pressed into engagement with the side surface 15 and top surface 17 of the head 13a. This restricts the relative position of the heating coil 11 with respect to the P rail 13, so that the coil side 11a of the heating coil 11 is positioned relative to the side surface 15 of the P rail 13, as shown in FIGS. 3a and 3b. A predetermined gap L 1 (e.g. 5 to 12
The coil sides 11m, 11k, etc. of the heating coil 11 have a predetermined gap L 2 (5 mm) in the height direction with respect to the top surface 17 of the P rail 13.
~20mm). By supplying a high frequency induced current with a frequency of 1 KHz from the high frequency power source 12 to the heating coil 11 and moving the P rail 13 along its longitudinal direction (direction of arrow A), the top 13a of the P rail 13 is High frequency induction heating.
なお、この場合、高周波電力及びＰレール１３
の移動速度（送り速度）は図外の制御機構の働き
により段階的に切換えられる。すなわち、Ｐレー
ル１３が巾広部２０から巾狭部２１にかけて加熱
コイル１１を通過する際の一例を挙げると、第１
図において、R1で示す区間（最も巾広の部分）
では280KW，10mm／Ｓ、区間R2では250KW，８
mm／Ｓ、区間R3では220KW，７mm／Ｓ、区間R4
では180KW，６mm／Ｓ、区間R5では150KW，５
mm／Ｓである。 In addition, in this case, the high frequency power and the P rail 13
The moving speed (feeding speed) of is changed in stages by the action of a control mechanism (not shown). That is, to give an example when the P rail 13 passes through the heating coil 11 from the wide part 20 to the narrow part 21, the first
In the figure, the section indicated by R 1 (the widest part)
280KW, 10mm/S in section R 2 , 250KW, 8
mm/S, 220KW in section R 3 , 7mm/S, section R 4
180KW, 6mm/S in section R 5 , 150KW, 5
mm/S.
この際、回転ローラ１８及び１９は所定の附勢
力f1，f2にてＰレール１３の側面１５及び頂面１
７に常時圧着しているため、高周波誘導加熱装置
１０がＰレール１３の巾広部２０から巾狭部２１
にかけて相対的に移動されるのに伴つてローラ・
アセンブリ１４及び加熱コイル１１はＰレール１
３の巾方向（矢印Ｂ方向）に水平に偏倚される。
その結果、加熱コイル１１のコイル辺部１１ａが
Ｐレール１３の側面１５に追従動作し、これらの
間のギヤツプL1は常に保たれることとなる。 At this time, the rotating rollers 18 and 19 apply predetermined energizing forces f 1 and f 2 to the side surface 15 and top surface 1 of the P rail 13.
7, the high frequency induction heating device 10 moves from the wide part 20 to the narrow part 21 of the P rail 13.
The rollers and
Assembly 14 and heating coil 11 are connected to P-rail 1
3 is horizontally biased in the width direction (direction of arrow B).
As a result, the coil side portion 11a of the heating coil 11 moves to follow the side surface 15 of the P rail 13, and the gap L1 therebetween is always maintained.
本実施例によれば、Ｐレール１３の側面１５を
1KHzの電源で800℃以上の温度に加熱し得るよう
に15mm以上の肉厚部分に対応する位置に加熱コイ
ル１１のコイル辺部１１ａを配置し、かつ、Ｐレ
ール１３と加熱コイル１１のコイル辺部１１ａと
の間の電気的結合を改善するためにローラ・アセ
ンブリ１４を設けてＰレール１３の側部１５との
間のギヤツプL1を所望の一定間隔（５〜12mm）
に保持するようにしたので、当該部分に必要な高
周波電力を投入し得てこの部分を800℃以上の所
要温度に高周波誘導加熱することができる。しか
も、上述のように、コイル辺部１１ａに対応する
部分を800℃以上に加熱できるので、当該部分か
らの熱伝導と、加熱コイル１１のコイル辺部１１
ｇ，１１ｉ，１１ｋ，１１ｎ等との間に生じる近
接効果による加熱作用との相乗効果によつて、Ｐ
レール１３の頭部１３ａのうち巾が約15mm以下の
部分（従来では、1KHzの電源では500℃程度しか
加熱し得なかつた部分）の表面付近についても
800℃以上の温度に加熱することができる。それ
に加えて、Ｐレール１３の頭部断面形状が小さく
なるのに従つて高周波電力及びＰレール１３の移
動速度を適宜設定するようにしているので、Ｐレ
ール１３の断面漸変部の全長に亘つて例えば900
〜1050℃に均一加熱することができる。なお、断
面漸変部に連なる定尺レール部分の加熱も第３図
ｂに示すように同一の加熱コイル１１にて均一加
熱することができきる。 According to this embodiment, the side surface 15 of the P rail 13 is
The coil side 11a of the heating coil 11 is arranged at a position corresponding to a wall thickness of 15 mm or more so that it can be heated to a temperature of 800°C or more with a 1KHz power supply, and the coil side 11a of the heating coil 11 is arranged at a position corresponding to a wall thickness of 15 mm or more, and the coil side of the P rail 13 and the heating coil 11 are A roller assembly 14 is provided to improve the electrical connection between the P-rail 13 and the side 15 of the P-rail 13 by adjusting the gap L1 to a desired constant distance (5 to 12 mm).
Therefore, the necessary high-frequency power can be applied to the part concerned, and this part can be heated by high-frequency induction to the required temperature of 800° C. or more. Moreover, as described above, since the portion corresponding to the coil side portion 11a can be heated to 800° C. or higher, the heat conduction from the portion and the coil side portion 11 of the heating coil 11
Due to the synergistic effect with the heating effect due to the proximity effect that occurs between
Regarding the area near the surface of the head 13a of the rail 13 whose width is approximately 15 mm or less (conventionally, the area could only be heated to about 500°C with a 1KHz power source).
Can be heated to temperatures over 800℃. In addition, as the cross-sectional shape of the head of the P-rail 13 becomes smaller, the high-frequency power and the moving speed of the P-rail 13 are set appropriately, so that the cross-sectional shape of the P-rail 13 is gradually changed over the entire length. For example, 900
Can be heated uniformly to ~1050℃. Furthermore, as shown in FIG. 3b, the fixed-length rail portion connected to the gradually changing section can be heated uniformly by the same heating coil 11.
以上、本発明の一実施例に付き述べたが、本発
明は既述の実施例に限定されるものではなく、本
発明の技術的思想に基いて各種の変形及び変更が
可能である。 Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above, and various modifications and changes can be made based on the technical idea of the present invention.
例えば、既述の実施例においては、Ｐレール１
３を送り移動するように構成したが、Ｐレール１
３を固定し、加熱コイル１１及びローラ・アセン
ブリ１４をＰレール１３の長手方向に沿つて移動
させるようにしてもよい。また、既述の実施例に
おいては、高周波誘導電流の「浸透深さ」が約15
mm前後の周波数すなわち1KHzの電源１２を用い
たが実験の結果、その周波数は約600Hz〜10KHz
の範囲内であれば適宜変更しても既述の如き均一
加熱が可能であることが確かめられている。な
お、電源の周波数を10KHz以上とした場合には、
Ｐレール１３を所望の深さまで加熱しようとする
とレール表面のオーバーヒートがさけられず、ま
たＰレール１３と加熱コイル１１との間のギヤツ
プを小さくしてやらなければ充分な近接効果が働
かないので、前記ギヤツプの管理をより厳密に行
なわなければならない不都合を生じる。一方、電
源の周波数を600Hz以下とした場合には、いわゆ
るズブ加熱にはよいが、Ｐレール１３の巾狭部２
１の表面加熱を効果的に行なうことができない。 For example, in the embodiment described above, P rail 1
3 was configured to feed and move, but P rail 1
3 may be fixed, and the heating coil 11 and roller assembly 14 may be moved along the length of the P-rail 13. In addition, in the embodiment described above, the "penetration depth" of the high-frequency induced current is approximately 15
We used a power supply 12 with a frequency of around mm, that is, 1KHz, but as a result of experiments, the frequency was about 600Hz to 10KHz.
It has been confirmed that uniform heating as described above can be achieved even if the temperature is changed appropriately within the range of . In addition, if the frequency of the power supply is 10KHz or more,
If an attempt is made to heat the P rail 13 to a desired depth, overheating of the rail surface cannot be avoided, and a sufficient proximity effect will not work unless the gap between the P rail 13 and the heating coil 11 is made small. This results in the inconvenience of having to carry out more strict management. On the other hand, when the frequency of the power supply is set to 600Hz or less, it is good for so-called sub-heating, but the narrow part of the P rail 13
1 cannot be effectively heated.
ｅ 発明の効果
以上の如く、本発明は、断面が漸変するレール
頭部の頂面及び片方の側面と高周波誘導加熱コイ
ルとの間のギヤツプを常に一定に保持して、高周
波誘導加熱を行なうようにしたものであるから、
前記レール頭部の頂面及び片方の側面と加熱コイ
ルとの間の電気的結合が常に良好に保たれること
となり、頭頂部巾が狭い部分から広い部分の全体
に亘つて均一に加熱することができる。従つて、
本発明に係る高周波誘導加熱方法により、例えば
Ｐレールの頭部の加熱処理を効果的に行なうこと
ができる。e Effects of the Invention As described above, the present invention performs high-frequency induction heating by always keeping constant the gap between the top surface and one side surface of the rail head whose cross section changes gradually and the high-frequency induction heating coil. Because it was done like this,
The electrical connection between the top surface and one side surface of the rail head and the heating coil is always maintained well, so that heating is uniformly performed over the entire area from the narrow part to the wide part of the top of the rail head. I can do it. Therefore,
By the high frequency induction heating method according to the present invention, for example, the head of a P rail can be effectively heated.
第１図〜第３図は本発明の一実施例を示すもの
であつて、第１図は本発明に係る方法を実施する
ために用いられる高周波誘導加熱装置の概略斜視
図、第２図ａはＰレールの頭部の巾狭部とロー
ラ・アセンブリとの位置関係を示す断面図、第２
図ｂはＰレールの頭部の巾広部とローラ・アセン
ブリとの位置関係を示す断面図、第３図ａはＰレ
ールの頭部の巾狭部と加熱コイルとの位置関係を
示す断面図、第３図ｂはＰレールの頭部の巾広部
と加熱コイルとの位置関係を示す断面図、第４図
は定尺レールの斜視図、第５図はＰレールの斜視
図、第６図は第５図における−線断面図、第
７図は第５図における−線断面図、第８図は
第５図における−線断面図、第９図は従来の
方法でＰレールの頭部を高周波誘導加熱する場合
を示す斜視図、第１０図は鋼材の肉厚と、臨界周
波数と、加熱温度との関係を示すグラフである。
１０……高周波誘導加熱装置、１１……高周波
誘導加熱コイル、１１ａ〜１１ｐ……コイル辺
部、１２……高周波電源、１３……Ｐレール（ポ
イント・レール）、１３ａ……頭部、１４……ロ
ーラ・アセンブリ、１５，１６……側面、１８，
１９……回転ローラ、２０……巾広部、２１……
巾狭部。
1 to 3 show an embodiment of the present invention, in which FIG. 1 is a schematic perspective view of a high-frequency induction heating device used to carry out the method according to the present invention, and FIG. 2 a is a sectional view showing the positional relationship between the narrow part of the head of the P rail and the roller assembly;
Figure b is a sectional view showing the positional relationship between the wide part of the head of the P-rail and the roller assembly, and Figure 3a is a sectional view showing the positional relationship between the narrow part of the head of the P-rail and the heating coil. , Fig. 3b is a sectional view showing the positional relationship between the wide part of the head of the P rail and the heating coil, Fig. 4 is a perspective view of the standard length rail, Fig. 5 is a perspective view of the P rail, and Fig. 6 The figure shows a sectional view taken along the line - in Fig. 5, Fig. 7 shows a sectional view taken along the - line in Fig. 5, Fig. 8 shows a sectional view taken along the - line in Fig. FIG. 10 is a perspective view showing the case where the steel material is subjected to high-frequency induction heating, and FIG. 10 is a graph showing the relationship between the wall thickness of the steel material, the critical frequency, and the heating temperature. DESCRIPTION OF SYMBOLS 10... High frequency induction heating device, 11... High frequency induction heating coil, 11a-11p... Coil side part, 12... High frequency power supply, 13... P rail (point rail), 13a... Head, 14... ...roller assembly, 15, 16...side, 18,
19...Rotating roller, 20...Wide portion, 21...
Narrow part.
Claims (1)
コイルとを相対移動させることによつて前記レー
ルの頭部を高周波誘導加熱するに際し、前記レー
ルの頂面及び片方の側面と前記加熱コイルとの間
のギヤツプを常に一定に保持するようにしたこと
を特徴とするレールの高周波誘導加熱方法。 ２ 前記加熱コイルに対応するレール部分の断面
形状に応じて、前記加熱コイルに供給する高周波
電力と、前記相対移動の速度とをそれぞれ変化さ
せるようにしたことを特徴とする特許請求の範囲
第１項に記載のレールの高周波誘導加熱方法。 ３ 前記レールの片方の側面を加熱する前記加熱
コイルのコイル辺部を、前記コイル辺部に供給さ
れる高周波誘導電流にて所望の温度に加熱し得る
ような肉厚のレール部分に対応する位置に配置す
るようにしたことを特徴とする特許請求の範囲第
１項又は第２項に記載のレールの高周波誘導加熱
方法。 ４ 前記レールの頂面に対応するように前記レー
ルの長手方向に沿つて延びる複数のコイル辺部を
有する高周波誘導加熱コイルを用い、前記加熱コ
イルが前記レールの巾方向に偏倚したときにも前
記レールの頂面を前記複数のコイル辺部にて加熱
するようにしたことを特徴とする特許請求の範囲
第１項〜第３項のうち何れか１項に記載のレール
の高周波誘導加熱方法。 ５ 前記加熱コイルに供給する電源の周波数を
600Hz〜10KHzとしたことを特徴とする特許請求
の範囲第１項〜第４項のうち何れか１項に記載の
レールの高周波誘導加熱方法。[Scope of Claims] 1. When performing high-frequency induction heating on the head of the rail by relatively moving a rail whose head section gradually changes and a high-frequency induction heating coil, the top surface and one side surface of the rail are heated by high-frequency induction. A high-frequency induction heating method for a rail, characterized in that a gap between the heating coil and the heating coil is always maintained constant. 2. According to the cross-sectional shape of the rail portion corresponding to the heating coil, the high frequency power supplied to the heating coil and the speed of the relative movement are respectively changed. High-frequency induction heating method for rails as described in . 3. A position corresponding to a thick rail portion that allows a coil side portion of the heating coil that heats one side of the rail to be heated to a desired temperature by a high-frequency induced current supplied to the coil side portion. 3. The method for high-frequency induction heating of a rail according to claim 1 or 2, wherein 4. Using a high-frequency induction heating coil having a plurality of coil sides extending along the longitudinal direction of the rail so as to correspond to the top surface of the rail, even when the heating coil is deflected in the width direction of the rail, The high-frequency induction heating method for a rail according to any one of claims 1 to 3, wherein the top surface of the rail is heated by the side portions of the plurality of coils. 5 Set the frequency of the power supply to the heating coil to
A high-frequency induction heating method for a rail according to any one of claims 1 to 4, characterized in that the heating frequency is 600Hz to 10KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18808086A JPS6345321A (en) | 1986-08-11 | 1986-08-11 | High-frequency induction heating of rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18808086A JPS6345321A (en) | 1986-08-11 | 1986-08-11 | High-frequency induction heating of rail |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6345321A JPS6345321A (en) | 1988-02-26 |
| JPH0341528B2 true JPH0341528B2 (en) | 1991-06-24 |
Family
ID=16217352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18808086A Granted JPS6345321A (en) | 1986-08-11 | 1986-08-11 | High-frequency induction heating of rail |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6345321A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03219022A (en) * | 1990-01-24 | 1991-09-26 | Nippon Steel Corp | High frequency induction heating method for rail |
| JPH04218404A (en) * | 1990-08-31 | 1992-08-10 | Sumitomo Rubber Ind Ltd | Tubeless radial tire |
| JP2767501B2 (en) * | 1991-04-11 | 1998-06-18 | 横浜ゴム株式会社 | Pneumatic radial tires for passenger cars |
| JP2767502B2 (en) * | 1991-04-12 | 1998-06-18 | 横浜ゴム株式会社 | Pneumatic radial tires for passenger cars |
| JP4675681B2 (en) * | 2005-05-31 | 2011-04-27 | 株式会社峰製作所 | Continuous head hardening heat treatment method and heat treatment apparatus for special cross-section rail |
| KR100760657B1 (en) | 2006-05-29 | 2007-09-20 | 정운경 | Linear Motion Rail Heat Treatment Equipment |
| US9040882B2 (en) * | 2007-09-12 | 2015-05-26 | Inductotherm Corp. | Electric induction heating of a rail head with non-uniform longitudinal temperature distribution |
| CN102296501A (en) * | 2011-06-16 | 2011-12-28 | 中国农业大学 | Seamless track rail temperature locking preprocessing system |
| CA2941217C (en) * | 2014-04-08 | 2018-10-30 | Nippon Steel & Sumitomo Metal Corporation | Heat treatment device, heat treatment method, and rail steel |
-
1986
- 1986-08-11 JP JP18808086A patent/JPS6345321A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6345321A (en) | 1988-02-26 |
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