JP5282997B2 - High frequency heating coil - Google Patents
High frequency heating coil Download PDFInfo
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- JP5282997B2 JP5282997B2 JP2008123591A JP2008123591A JP5282997B2 JP 5282997 B2 JP5282997 B2 JP 5282997B2 JP 2008123591 A JP2008123591 A JP 2008123591A JP 2008123591 A JP2008123591 A JP 2008123591A JP 5282997 B2 JP5282997 B2 JP 5282997B2
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- ring portion
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- frequency heating
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- 238000010438 heat treatment Methods 0.000 title claims description 38
- 230000006698 induction Effects 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 3
- 230000002401 inhibitory effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
- General Induction Heating (AREA)
- Heat Treatment Of Articles (AREA)
Description
本発明は、ワークを誘導加熱するヘアピン型の高周波加熱コイルに関する。 The present invention relates to a hairpin type high frequency heating coil for induction heating of a workpiece.
ヘアピン型の高周波加熱コイルは、高周波電源に接続される二股のリード部と、リード部に連なる一対の円弧状の元リング部と、各元リング部の終端から直角の軸方向へ平行に延びる平行部と、各平行部の先端から元リング部と平行な面内で円弧状に連なる先リング部とから成り、内部に冷却水を通すようにパイプを接続して形成されている（例えば、特許文献１、２参照）。 The hairpin type high-frequency heating coil includes a bifurcated lead portion connected to a high-frequency power source, a pair of arc-shaped original ring portions connected to the lead portion, and a parallel extending from the end of each original ring portion in a perpendicular axis direction. Part and a tip ring part that continues in an arc shape in a plane parallel to the original ring part from the tip of each parallel part, and is formed by connecting pipes to allow cooling water to pass inside (for example, patents) References 1 and 2).
特許文献１、２に記載されたものは、いずれも元リング部と先リング部を平行部に対して同じ側に設けたセミループ型のものとされ、加熱コイルを形成するパイプは矩形断面の角パイプとされている。元リング部と先リング部を平行部に対して反対側に設けたものもある。また、高周波電流が供給されるリード部は、エポキシ樹脂やフェノール樹脂等の絶縁性の樹脂材料で形成されたコイル支持部材で支持される。 Each of Patent Documents 1 and 2 is a semi-loop type in which the original ring portion and the leading ring portion are provided on the same side with respect to the parallel portion, and the pipe forming the heating coil has a rectangular cross section. It is a pipe. In some cases, the former ring portion and the leading ring portion are provided on the opposite side with respect to the parallel portion. The lead portion to which the high-frequency current is supplied is supported by a coil support member made of an insulating resin material such as epoxy resin or phenol resin.
このようなヘアピン型高周波加熱コイルでは、回転対称のワークが元リング部と先リング部の内径側に挿入されて、回転されながら焼入れ等の熱処理のために表層部を誘導加熱される。このとき、高周波加熱コイルとワークの間には、形成される電磁場によって互いに反撥するローレンツ力が発生し、このローレンツ力が高周波加熱コイルに繰り返し作用することによって、コイルの特定部位が疲労し、破損に至ることがある。 In such a hairpin type high frequency heating coil, a rotationally symmetric workpiece is inserted into the inner diameter side of the former ring portion and the leading ring portion, and the surface layer portion is induction-heated for heat treatment such as quenching while being rotated. At this time, a Lorentz force that repels each other due to the formed electromagnetic field is generated between the high-frequency heating coil and the workpiece, and this Lorentz force repeatedly acts on the high-frequency heating coil, so that a specific part of the coil is fatigued and damaged. May lead to.
この疲労による破損は、先リング部の内径側に発生する亀裂を起点とすることが多く、特に、スタブシャフト、ハブ輪、等速ジョイント外輪等のように、軸状または筒状で小径部と大径部を有するワークを誘導加熱するもので生じやすい。 In many cases, the fatigue damage is caused by a crack generated on the inner diameter side of the tip ring portion, and in particular, a shaft-like or tubular-like small-diameter portion such as a stub shaft, a hub wheel, or a constant velocity joint outer ring. It is likely to occur by induction heating of a workpiece having a large diameter portion.
本発明者らは、本発明の実施形態を説明する図２に示すように、元リング部３と先リング部５が平行部４の反対側に設けられた高周波加熱コイル１を用いて、小径部としての車軸管部３１ａと、大径部としての車輪取り付けフランジ３１ｂを有するハブ輪３１をワークとして誘導加熱する場合について、高周波加熱コイル１に作用するローレンツ力をコンピュータで計算した。この計算結果を図５（ａ）、（ｂ）のコンピュータのモニタ画面で示す。ローレンツ力の向きと大きさは、矢印のベクトルで表示されている。 As shown in FIG. 2 for explaining the embodiment of the present invention, the present inventors use a high-frequency heating coil 1 in which a former ring portion 3 and a leading ring portion 5 are provided on the opposite side of the parallel portion 4, and have a small diameter. The Lorentz force acting on the high-frequency heating coil 1 was calculated by a computer in the case where induction heating was performed using a hub ring 31 having an axle tube portion 31a as a portion and a wheel mounting flange 31b as a large diameter portion as a workpiece. The calculation results are shown on the computer monitor screens of FIGS. The direction and magnitude of the Lorentz force is indicated by a vector of arrows.
図５（ａ）は、リード部２に沿う中心線に対して対称な高周波加熱コイル１の片側半分のみを示すが、元リング部３と先リング部５を拡径変形させるローレンツ力が作用し、先リング部５に作用するローレンツ力は、元リング部３に作用するものよりもかなり大きいことが分かる。この理由は、先リング部５には、ワークの小径部のほかに大径部の肩部も接近していることと、元リング部３はリード部２で１／４円弧に分割されているのに対して、先リング部５は１／２円弧で連なっていることのためと考えられる。 FIG. 5A shows only one half of the high-frequency heating coil 1 that is symmetric with respect to the center line along the lead portion 2, but Lorentz force that expands and deforms the original ring portion 3 and the leading ring portion 5 acts. It can be seen that the Lorentz force acting on the leading ring portion 5 is considerably larger than that acting on the leading ring portion 3. This is because the shoulder portion of the large-diameter portion is approaching the tip ring portion 5 in addition to the small-diameter portion of the workpiece, and the original ring portion 3 is divided into ¼ arcs by the lead portion 2. On the other hand, it is considered that the leading ring portion 5 is connected by a half arc.
また、図５（ｂ）に示すように、先リング部５には、軸方向に変形させるローレンツ力も作用している。この軸方向のローレンツ力は、ワークの大径部との間に発生するものと考えられ、先リング部５の疲労を促進する可能性がある。 Further, as shown in FIG. 5B, Lorentz force that deforms in the axial direction also acts on the tip ring portion 5. This axial Lorentz force is considered to be generated between the workpiece and the large-diameter portion of the workpiece, and may promote fatigue of the tip ring portion 5.
そこで、本発明の課題は、ヘアピン型高周波加熱コイルの先リング部でのローレンツ力による疲労を軽減し、その内径側での亀裂の発生を防止することである。 Accordingly, an object of the present invention is to reduce fatigue due to Lorentz force at a tip ring portion of a hairpin type high-frequency heating coil, and to prevent generation of cracks on the inner diameter side thereof.
上記の課題を解決するために、本発明は、絶縁性材料で形成されたコイル支持部材に支持され、高周波電源に接続される二股のリード部と、リード部に連なる一対の円弧状の元リング部と、各元リング部の終端から直角の軸方向へ平行に延びる一対の平行部と、一対の平行部の先端から前記元リング部と平行な面内で円弧状に連なる先リング部とから成り、ワークを誘導加熱するヘアピン型の高周波加熱コイルにおいて、前記先リング部の拡径変形を抑制する手段を設けた構成を採用した。 In order to solve the above-described problems, the present invention provides a bifurcated lead portion supported by a coil support member formed of an insulating material and connected to a high-frequency power source, and a pair of arc-shaped original rings connected to the lead portion. Part, a pair of parallel parts extending in parallel in the axial direction perpendicular to the end of each original ring part, and a tip ring part connected in a circular arc from the tip of the pair of parallel parts in a plane parallel to the original ring part The hairpin type high-frequency heating coil for induction heating the work employs a configuration in which means for suppressing the diameter expansion deformation of the tip ring portion is provided.
すなわち、先リング部の拡径変形を抑制する手段を設けることにより、ヘアピン型高周波加熱コイルの先リング部でのローレンツ力による疲労を軽減し、その内径側での亀裂の発生を防止できるようにした。 That is, by providing a means for suppressing the diameter expansion deformation of the front ring portion, fatigue due to the Lorentz force at the front ring portion of the hairpin type high frequency heating coil can be reduced, and the occurrence of cracks on the inner diameter side can be prevented. did.
前記先リング部の拡径変形を抑制する手段を、先リング部の外径側へ放射状に延びる複数の舌片を設け、前記コイル支持部材に前記先リング部の外径側で環状に連なる環状部を設けて、この環状部に前記各舌片を固定するものとすることにより、コイル支持部材を利用して、先リング部の拡径変形を簡単に抑制することができる。 The means for suppressing the diameter expansion deformation of the tip ring portion is provided with a plurality of tongue pieces extending radially to the outer diameter side of the tip ring portion, and the coil support member is annularly connected in an annular shape on the outer diameter side of the tip ring portion By providing the portion and fixing the tongue pieces to the annular portion, the diameter expansion deformation of the tip ring portion can be easily suppressed using the coil support member.
前記コイル支持部材の環状部に、前記一対の平行部と平行な一対の柱部を立設し、これらの柱部を平行部と連結することにより、平行部の変形と先リング部の軸方向への変形も抑制して、先リング部でのローレンツ力による疲労をより軽減することができる。 A pair of pillars parallel to the pair of parallel parts are erected on the annular part of the coil support member, and the parallel parts are deformed and the axial direction of the front ring part is established by connecting these pillars with the parallel parts. It is also possible to suppress deformation due to Lorentz force at the tip ring part, and to further reduce fatigue.
上述した各高周波加熱コイルは、前記誘導加熱されるワークが、軸状または筒状で小径部と大径部を有するものに好適である。 Each of the high-frequency heating coils described above is suitable for a case where the work to be induction-heated is a shaft or a cylinder and has a small diameter portion and a large diameter portion.
前記先リング部の断面形状を、内径側の断面高さ寸法が外径側よりも小さいものとすることにより、ワークの使用時に応力集中が発生しやすい大径部の立ち上り部を効率よく、誘導加熱することができる。なお、この場合は、先リング部に作用するローレンツ力により内径側の引張ひずみが大きくなるが、先リング部の拡径変形そのものが抑制されるので、先リング部の内径側に亀裂が発生することはない。 By making the cross-sectional shape of the tip ring part smaller in cross-sectional height dimension on the inner diameter side than on the outer diameter side, it is possible to efficiently guide the rising part of the large-diameter part where stress concentration tends to occur during use of the workpiece. Can be heated. In this case, the tensile strain on the inner diameter side increases due to the Lorentz force acting on the tip ring portion, but since the diameter expansion deformation of the tip ring portion itself is suppressed, a crack occurs on the inner diameter side of the tip ring portion. There is nothing.
本発明の高周波加熱コイルは、先リング部の拡径変形を抑制する手段を設けたので、ヘアピン型高周波加熱コイルの先リング部でのローレンツ力による疲労を軽減し、その内径側での亀裂の発生を防止することができる。 Since the high-frequency heating coil of the present invention is provided with means for suppressing the diameter expansion deformation of the tip ring portion, the fatigue due to the Lorentz force at the tip ring portion of the hairpin type high-frequency heating coil is reduced, and cracks on the inner diameter side are reduced. Occurrence can be prevented.
前記先リング部の拡径変形を抑制する手段を、先リング部の外径側へ放射状に延びる複数の舌片を設け、コイル支持部材に先リング部の外径側で環状に連なる環状部を設けて、この環状部に各舌片を固定するものとすることにより、コイル支持部材を利用して、先リング部の拡径変形を簡単に抑制することができる。 The means for suppressing the diameter expansion deformation of the tip ring portion is provided with a plurality of tongue pieces extending radially to the outer diameter side of the tip ring portion, and the coil support member is provided with an annular portion that is annularly connected on the outer diameter side of the tip ring portion. By providing and fixing each tongue piece to this annular part, the diameter expansion deformation | transformation of a tip ring part can be easily suppressed using a coil support member.
前記コイル支持部材の環状部に、一対の平行部と平行な一対の柱部を立設し、これらの柱部を平行部と連結することにより、平行部の変形と先リング部の軸方向への変形も抑制して、先リング部でのローレンツ力による疲労をより軽減することができる。 A pair of pillars parallel to the pair of parallel parts are erected on the annular part of the coil support member, and these pillars are connected to the parallel parts, thereby deforming the parallel part and moving in the axial direction of the leading ring part. The deformation due to the Lorentz force at the tip ring portion can be further reduced.
前記誘導加熱されるワークが、軸状または筒状で小径部と大径部を有するものである場合は、前記先リング部の断面形状を、内径側の断面高さ寸法が外径側よりも小さいものとすることにより、ワークの使用時に応力集中が発生しやすい大径部の立ち上り部を効率よく、誘導加熱することができる。 When the induction-heated work is a shaft or cylinder and has a small diameter part and a large diameter part, the cross-sectional shape of the tip ring part is set so that the cross-sectional height dimension on the inner diameter side is larger than the outer diameter side. By making it small, the rising portion of the large-diameter portion where stress concentration tends to occur during use of the workpiece can be efficiently induction-heated.
以下、図面に基づき、本発明の実施形態を説明する。図１乃至図３に示すように、この高周波加熱コイル１は、小径部としての車軸管部３１ａと、大径部としての車輪取り付けフランジ３１ｂを有するハブ輪３１をワークとして誘導加熱するヘアピン型のものであり、導電部２ａを介して高周波電源（図示省略）に接続される二股のリード部２と、リード部２に連なる一対の１／４円弧状の元リング部３と、各元リング部３の終端から直角の軸方向下方へ平行に延びる一対の平行部４と、一対の平行部４の先端から元リング部３と平行な面内で元リング部３と反対側へ１／２円弧状に連なる先リング部５とから成り、内部に冷却水を通すように銅製の角パイプを接続して形成され、絶縁性の樹脂材料で形成されたコイル支持部材２１に支持されている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the high-frequency heating coil 1 is a hairpin type coil that induction-heats a hub wheel 31 having an axle tube portion 31a as a small diameter portion and a wheel mounting flange 31b as a large diameter portion as a work. A bifurcated lead portion 2 connected to a high-frequency power source (not shown) via a conductive portion 2a, a pair of 1/4 arc-shaped original ring portions 3 connected to the lead portion 2, and each original ring portion A pair of parallel portions 4 extending parallel to the lower side in the axial direction perpendicular to the end of 3, and a half circle from the tip of the pair of parallel portions 4 to the opposite side of the original ring portion 3 in a plane parallel to the original ring portion 3 It consists of a tip ring portion 5 that continues in an arc shape, is formed by connecting a copper square pipe so that cooling water passes inside, and is supported by a coil support member 21 formed of an insulating resin material.
前記ハブ輪３１は車軸管部３１ａを上に向けて、先リング部５の下方から高周波加熱コイル１の内側に挿入され、車輪取り付けフランジ３１ｂの立ち上り部が先リング部５に接近しており、先リング部５を形成する角パイプの断面形状は、内径側の断面高さ寸法が外径側よりも小さい横向きの台形状とされている。また、車軸管部３１ａの上端部に接近する元リング部３は、先リング部５よりも少し小径とされ、その角パイプの断面形状は略５角形状とされている。この元リング部３の角パイプは矩形断面としてもよい。 The hub wheel 31 is inserted into the inside of the high-frequency heating coil 1 from below the tip ring portion 5 with the axle tube portion 31a facing upward, and the rising portion of the wheel mounting flange 31b approaches the tip ring portion 5; The cross-sectional shape of the square pipe forming the tip ring portion 5 is a laterally trapezoidal shape in which the cross-sectional height dimension on the inner diameter side is smaller than that on the outer diameter side. Moreover, the former ring part 3 approaching the upper end part of the axle tube part 31a has a slightly smaller diameter than the tip ring part 5, and the cross-sectional shape of the square pipe is substantially pentagonal. The square pipe of the original ring portion 3 may have a rectangular cross section.
前記先リング部５の中間部には、少し立ち上がって外径側に延び、２つの給水口６ａを有する給水部６が設けられ、各リード部２には、それぞれ冷却水が供給される排水口７ａを有する排水部７が立ち上がるように設けられており、高周波加熱コイル１は、リード部２に沿う中心線で分割される半分ずつが別々の冷却水経路で冷却されるようになっている。 A water supply portion 6 having two water supply ports 6a is provided at the middle portion of the tip ring portion 5 and extends to the outer diameter side, and each lead portion 2 is a drain port to which cooling water is supplied. The high-frequency heating coil 1 is provided so that the half of the high-frequency heating coil 1 divided by the center line along the lead portion 2 is cooled by separate cooling water paths.
前記コイル支持部材２１は、外形が矩形状で中央部に孔２２がくり抜かれた環状板とされ、この孔２２の内側に元リング部３と先リング部５が納められており、リード部２と給水部６に設けられた舌片８ａ、８ｂが、コイル支持部材２１に取り付けられて、高周波加熱コイル１が支持されている。なお、コイル支持部材２１の外形は、設備に応じて円形や多角形等の任意の形状とすることができる。 The coil support member 21 is an annular plate having a rectangular outer shape with a hole 22 cut out in the center, and the original ring portion 3 and the leading ring portion 5 are accommodated inside the hole 22. The tongue pieces 8a and 8b provided in the water supply unit 6 are attached to the coil support member 21, and the high-frequency heating coil 1 is supported. In addition, the external shape of the coil support member 21 can be made into arbitrary shapes, such as circular and a polygon, according to an installation.
前記先リング部５には、図４に示すように、外径側へ６０°の位相で放射状に延びる４つの舌片９が設けられ、これらの舌片９が、図１に示したように、先リング部５の外径側で環状に連なるコイル支持部材２１の環状部に固定されている。また、コイル支持部材２１の環状部には、高周波加熱コイル１の一対の平行部４と同じ位相位置で、一対の柱部材２３が平行部４と平行に立設されるようにボルト２４で取り付けられ、各平行部４の上部に外向きにろう付けされたボルト１０が、ナット１１で各柱部２３に連結されている。したがって、ローレンツ力による先リング部５の拡径変形が抑制されるとともに、平行部４の変形と先リング部５の軸方向の変形も抑制される。 As shown in FIG. 4, the front ring portion 5 is provided with four tongue pieces 9 extending radially at a phase of 60 ° toward the outer diameter side, and these tongue pieces 9 are formed as shown in FIG. The coil support member 21 is fixed to the annular part of the tip ring part 5 that is annularly connected on the outer diameter side. In addition, a pair of column members 23 are attached to the annular portion of the coil support member 21 with bolts 24 so that the pair of column members 23 are erected in parallel with the parallel portion 4 at the same phase position as the pair of parallel portions 4 of the high-frequency heating coil 1. The bolts 10 brazed outwardly to the upper portions of the parallel portions 4 are connected to the pillar portions 23 with nuts 11. Accordingly, the diameter expansion deformation of the tip ring portion 5 due to the Lorentz force is suppressed, and the deformation of the parallel portion 4 and the deformation of the tip ring portion 5 in the axial direction are also suppressed.
上述した実施形態では、元リング部を上側、先リング部を下側として、これらを縦向きの平行部の反対側に設けたものとしたが、元リング部と先リング部を平行部の同じ側に設けたセミループ型のものとすることもできる。また、元リング部を下側、先リング部を上側とすることもでき、平行部を横向きとして、ワークを横方向から挿入するものとすることもできる。 In the above-described embodiment, the original ring portion is the upper side, the front ring portion is the lower side, and these are provided on the opposite side of the vertical parallel portion. However, the original ring portion and the front ring portion are the same as the parallel portion. It can also be a semi-loop type provided on the side. Further, the original ring portion can be the lower side, and the tip ring portion can be the upper side, and the workpiece can be inserted from the horizontal direction with the parallel portion sideways.
１ 高周波加熱コイル
２ リード部
２ａ 導電部
３ 元リング部
４ 平行部
５ 先リング部
６ 給水部
６ａ 給水口
７ 排水部
７ａ 排水口
８ａ、８ｂ、９ 舌片
１０ ボルト
１１ ナット
２１ コイル支持部材
２２ 孔
２３ 柱部材
２４ ボルト
３１ ハブ輪
３１ａ 車軸管部
３１ｂ 車輪取り付けフランジ
DESCRIPTION OF SYMBOLS 1 High frequency heating coil 2 Lead part 2a Conductive part 3 Original ring part 4 Parallel part 5 Tip ring part 6 Water supply part 6a Water supply port 7 Drainage part 7a Drainage port 8a, 8b, 9 Tongue piece 10 Bolt 11 Nut 21 Coil support member 22 Hole 23 Column member 24 Bolt 31 Hub wheel 31a Axle tube portion 31b Wheel mounting flange
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008123591A JP5282997B2 (en) | 2008-05-09 | 2008-05-09 | High frequency heating coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008123591A JP5282997B2 (en) | 2008-05-09 | 2008-05-09 | High frequency heating coil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2009272235A JP2009272235A (en) | 2009-11-19 |
| JP5282997B2 true JP5282997B2 (en) | 2013-09-04 |
Family
ID=41438601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008123591A Active JP5282997B2 (en) | 2008-05-09 | 2008-05-09 | High frequency heating coil |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5282997B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6024889B2 (en) * | 2012-10-22 | 2016-11-16 | 株式会社Ihi | Friction welding equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0141193Y2 (en) * | 1985-06-21 | 1989-12-06 | ||
| JP2906700B2 (en) * | 1991-02-19 | 1999-06-21 | 住友金属工業株式会社 | Pipe joining method and pipe clamp device |
| JP2914615B2 (en) * | 1995-03-03 | 1999-07-05 | 富士電子工業株式会社 | Variable heating range heating device |
| JPH11162626A (en) * | 1997-11-27 | 1999-06-18 | High Frequency Heattreat Co Ltd | Induction heating coil for integrally quenching gear mounted to shaft |
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2008
- 2008-05-09 JP JP2008123591A patent/JP5282997B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009272235A (en) | 2009-11-19 |
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