JP5907332B2 - Crankshaft induction hardening method and induction induction heating coil - Google Patents
Crankshaft induction hardening method and induction induction heating coil Download PDFInfo
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- JP5907332B2 JP5907332B2 JP2011158887A JP2011158887A JP5907332B2 JP 5907332 B2 JP5907332 B2 JP 5907332B2 JP 2011158887 A JP2011158887 A JP 2011158887A JP 2011158887 A JP2011158887 A JP 2011158887A JP 5907332 B2 JP5907332 B2 JP 5907332B2
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- 238000010438 heat treatment Methods 0.000 title claims description 173
- 230000006698 induction Effects 0.000 title claims description 72
- 238000000034 method Methods 0.000 title claims description 10
- 239000004020 conductor Substances 0.000 claims description 51
- 238000010791 quenching Methods 0.000 claims description 16
- 230000000171 quenching effect Effects 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 10
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
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- 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
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- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Description
本発明は、クランクシャフトのフィレット部を高周波焼入する方法及び高周波誘導加熱コイルに関する。 The present invention relates to a method of induction hardening a fillet portion of a crankshaft and a high frequency induction heating coil.
クランクシャフトを高周波焼入する場合、ピン部両端のフィレット部をピン部に対して均一に昇温させる、すなわち、ピン部とフィレット部との焼入深さを均一化するのは困難である。そこで、特許文献１には、フィレット部に対向する部分の電流密度を高めるため、断面形状を菱形に形成した加熱導体を有する高周波誘導加熱コイル（以下、加熱コイルという）が開示されている。 When the crankshaft is induction hardened, it is difficult to raise the temperature of the fillet portions at both ends of the pin portion uniformly relative to the pin portion, that is, to equalize the quenching depth between the pin portion and the fillet portion. Therefore, Patent Document 1 discloses a high-frequency induction heating coil (hereinafter referred to as a heating coil) having a heating conductor whose cross-sectional shape is formed in a diamond shape in order to increase the current density in a portion facing the fillet portion.
しかしながら、断面形状が菱形の加熱導体を採用した場合、加熱導体及びコア部（磁性体）の製作費並びに精度調整工数が大幅に増大して、加熱コイルの製造コストが上昇する。
そこで本発明は、上記事情に鑑みてなされたもので、クランクシャフトの軸部とフィレット部とを均一な焼入深さで高周波焼入することができ、且つ、高周波誘導加熱コイルの製造コストを削減することが可能なクランクシャフトの高周波焼入方法及びその高周波誘導加熱コイルを提供することを課題としてなされたものである。
However, when a heating conductor having a diamond-shaped cross section is employed, the manufacturing cost and accuracy adjustment man-hours for the heating conductor and the core (magnetic material) are greatly increased, and the manufacturing cost of the heating coil is increased.
Therefore, the present invention has been made in view of the above circumstances, and the shaft portion and the fillet portion of the crankshaft can be induction hardened with a uniform quenching depth, and the manufacturing cost of the high frequency induction heating coil can be reduced. An object of the present invention is to provide an induction hardening method for a crankshaft which can be reduced and a high frequency induction heating coil thereof.
上記課題を解決するために、本発明のクランクシャフトの高周波焼入方法は、加熱導体をクランクシャフトの被焼入部に対して予め決められたコイルギャップだけ離して高周波誘導加熱コイルを配置して、この状態で前記加熱コイルに通電することで前記被焼入部を高周波誘導加熱させて高周波焼入する方法であって、前記被焼入部は、軸部と該軸部の両端に形成されるフィレット部とを有して、前記加熱導体は、断面形状が長方形に形成されるとともに、全面が露出されて前記被焼入部のフィレット部に対向する第１加熱面と、全面が露出されて前記被焼入部の軸部に対向する第２加熱面と、コア部によって被覆されて相互に隣り合う第１被覆面及び第２被覆面とを有して、前記加熱導体の長方形の断面は、前記第１加熱面との交線に一致する第１加熱辺の長さが、前記第２加熱面との交線に一致する第２加熱辺の長さよりも長く設定され、前記第１加熱面と前記被焼入部のフィレット部とのコイルギャップを第１コイルギャップＧ１に設定するとともに、前記第２加熱面と前記被焼入部の軸部とのコイルギャップを前記第１コイルギャップＧ１よりも大きい第２コイルギャップＧ２に設定して、前記第１コイルギャップＧ１及び前記第２コイルギャップＧ２は、前記第１コイルギャップＧ１に対する前記第２コイルギャップＧ２の比率Ｇ２／Ｇ１が１．５〜３．０になるように設定され、この状態で前記加熱コイルに通電することで前記被焼入部のフィレット部と軸部とを高周波誘導加熱させて高周波焼入することを特徴とする。 In order to solve the above problems, the induction hardening method for a crankshaft according to the present invention is such that a heating conductor is separated by a predetermined coil gap from a portion to be hardened of the crankshaft, and a high frequency induction heating coil is disposed. In this state, a current is applied to the heating coil to induction-heat the to-be-quenched portion and induction-harden, and the to-be-quenched portion includes a shaft portion and fillet portions formed at both ends of the shaft portion. The heating conductor is formed in a rectangular cross-sectional shape, the first heating surface that is exposed to the entire face and facing the fillet portion of the to-be-quenched portion, and the entire surface is exposed and the to-be-fired The heating conductor has a second heating surface facing the shaft portion of the insertion portion, and a first covering surface and a second covering surface which are covered with the core portion and are adjacent to each other . Match the line of intersection with the heating surface That the length of the first heating sides than said length of the second second heating side matching line of intersection between the heating surface is set to be longer, the coils of the fillet portion of the object the hardened and the first heating surface sets the gap to the first coil gap G1, by setting the coil gap between the shaft portion of the object the hardened and the second heating surface in the second coil gap G2 greater than the first coil gap G1, the The first coil gap G1 and the second coil gap G2 are set so that the ratio G2 / G1 of the second coil gap G2 to the first coil gap G1 is 1.5 to 3.0, and in this state A high-frequency induction heating is performed on the fillet portion and the shaft portion of the to-be-quenched portion by energizing the heating coil, and induction hardening is performed.
上記課題を解決するために、本発明の高周波誘導加熱コイルは、クランクシャフトの軸部と該軸部の両端に形成されるフィレット部とを有する被焼入部を高周波焼入するための高周波誘導加熱コイルであって、断面形状が長方形に形成される加熱導体を有して、前記加熱導体は、全面が露出されて前記被焼入部のフィレット部に対向する第１加熱面と、全面が露出されて前記被焼入部の軸部に対向する第２加熱面と、コア部によって被覆されて相互に隣り合う第１被覆面及び第２被覆面とを有して、前記加熱導体の長方形の断面は、前記第１加熱面との交線に一致する第１加熱辺の長さが、前記第２加熱面との交線に一致する第２加熱辺の長さよりも長く設定され、前記第１加熱面と前記被焼入部のフィレット部とのコイルギャップが第１コイルギャップＧ１に設定されるとともに、前記第２加熱面と前記被焼入部の軸部とのコイルギャップが前記第１コイルギャップＧ１よりも大きい第２コイルギャップＧ２に設定され、前記第１コイルギャップＧ１及び前記第２コイルギャップＧ２は、前記第１コイルギャップＧ１に対する前記第２コイルギャップＧ２の比率Ｇ２／Ｇ１が１．５〜３．０になるように設定されることを特徴とする。 In order to solve the above-described problems, a high-frequency induction heating coil according to the present invention is a high-frequency induction heating for induction-quenching a portion to be hardened having a shaft portion of a crankshaft and fillet portions formed at both ends of the shaft portion. A heating conductor having a rectangular cross-sectional shape, the entire surface of the heating conductor being exposed and facing the fillet portion of the portion to be hardened; and the entire surface of the heating conductor being exposed. The heating conductor has a second heating surface facing the shaft portion of the to-be-quenched portion, a first covering surface and a second covering surface which are covered with the core portion and are adjacent to each other, and the rectangular cross section of the heating conductor is The length of the first heating side that coincides with the line of intersection with the first heating surface is set longer than the length of the second heating side that coincides with the line of intersection with the second heating surface, The coil gap between the surface and the fillet portion of the hardened portion is the first core. While being set to Rugyappu G1, the said second heating surface is set to the second coil gap G2 coil gap larger than said first coil gap G1 between the shaft portion of the the hardened, the first coil gap G1 The second coil gap G2 is set such that a ratio G2 / G1 of the second coil gap G2 to the first coil gap G1 is 1.5 to 3.0 .
（発明の態様）
以下に、本願において特許請求が可能と認識されている発明（以下、請求可能発明と称する）の態様を例示し、例示された各態様について説明する。ここでは、各態様を、特許請求の範囲と同様に、項に区分すると共に各項に番号を付し、必要に応じて他の項の記載を引用する形式で記載する。これは、請求可能発明の理解を容易にするためであり、請求可能発明を構成する構成要素の組み合わせを、以下の各項に記載されたものに限定する趣旨ではない。つまり、請求可能発明は、各項に付随する記載、実施形態の記載等を参酌して解釈されるべきであり、その解釈に従う限りにおいて、各項の態様にさらに他の構成要素を付加した態様も、また、各項の態様から構成要素を削除した態様も、請求可能発明の一態様となり得る。
なお、以下の各項において、（１）、（２）項の各々が、特許請求の範囲に記載した請求項１、２の各々に相当する。
(Aspect of the Invention)
In the following, aspects of the invention that is recognized as being capable of being claimed in the present application (hereinafter referred to as claimable invention) will be exemplified, and each exemplified aspect will be described. Here, as in the claims, each aspect is divided into paragraphs, numbers are assigned to the respective paragraphs, and the descriptions of other paragraphs are cited as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combination of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiment, etc., and as long as the interpretation is followed, another aspect is added to the aspect of each section. Moreover, the aspect which deleted the component from the aspect of each term can also be one aspect of the claimable invention.
In the following items, each of the items (1) and (2) corresponds to each of claims 1 and 2 described in the claims.
（１）加熱導体をクランクシャフトの被焼入部に対して予め決められたコイルギャップだけ離して高周波誘導加熱コイルを配置して、この状態で加熱コイルに通電することで被焼入部を高周波誘導加熱させて高周波焼入する方法であって、被焼入部は、軸部と該軸部の両端に形成されるフィレット部とを有して、加熱導体は、断面形状が長方形に形成されるとともに、全面が露出されて被焼入部のフィレット部に対向する第１加熱面と、全面が露出されて被焼入部の軸部に対向する第２加熱面と、コア部によって被覆されて相互に隣り合う第１被覆面及び第２被覆面とを有して、加熱導体の長方形の断面は、第１加熱面との交線に一致する第１加熱辺の長さが、第２加熱面との交線に一致する第２加熱辺の長さよりも長く設定され、第１加熱面と被焼入部のフィレット部とのコイルギャップを第１コイルギャップＧ１に設定するとともに、第２加熱面と被焼入部の軸部とのコイルギャップを第１コイルギャップＧ１よりも大きい第２コイルギャップＧ２に設定して、第１コイルギャップＧ１及び第２コイルギャップＧ２は、第１コイルギャップＧ１に対する第２コイルギャップＧ２の比率Ｇ２／Ｇ１が１．５〜３．０になるように設定され、この状態で加熱コイルに通電することで被焼入部のフィレット部と軸部とを高周波誘導加熱させて高周波焼入することを特徴とするクランクシャフトの高周波焼入方法。
本項に記載のクランクシャフトの高周波焼入方法によれば、断面形状が長方形に形成された加熱導体を有する高周波誘導加熱コイルを採用したことにより、断面形状が菱形に形成された加熱導体を有する公知の高周波誘導加熱コイルを採用した場合と比較して、高周波誘導加熱コイル（コア部を含む）の製作及び調整が容易であり、高周波誘導加熱コイルの製造コストを大幅に削減することができる。また、加熱導体の全面が露出した第１加熱面を被焼入部のフィレット部に対向させて、且つ加熱導体の全面が露出した第２加熱面を被焼入部の軸部に対向させたことにより、被焼入部のフィレット部と軸部とを同時に高周波焼入することができる。さらに、加熱導体の第１加熱面と被焼入部のフィレット部との間の第１コイルギャップＧ１を加熱導体の第２加熱面と被焼入部の軸部との間の第２コイルギャップＧ２よりも小さく設定したことにより、軸部と相対的に昇温し難いフィレット部とを均一に昇温させることが可能であり、その結果、クランクシャフトの被焼入部を均一な焼入深さで高周波焼入することができる。
(1) A high-frequency induction heating coil is disposed with a heating conductor separated from the hardened portion of the crankshaft by a predetermined coil gap, and the heated portion is energized in this state so that the hardened portion is high-frequency induction heated. In the method of induction hardening, the portion to be hardened has a shaft portion and fillet portions formed at both ends of the shaft portion, and the heating conductor is formed in a rectangular cross-section, A first heating surface with the entire surface exposed and facing the fillet portion of the to-be-quenched portion, a second heating surface with the entire surface exposed and facing the shaft portion of the to-be-quenched portion, and the core portion are adjacent to each other. The rectangular cross section of the heating conductor having the first coated surface and the second coated surface is such that the length of the first heating side that coincides with the line of intersection with the first heated surface intersects the second heated surface. It is set to be longer than the length of the second heating side matching line, the first heating And the coil gap between the fillet portion of the hardened portion is set to the first coil gap G1, and the coil gap between the second heating surface and the shaft portion of the hardened portion is larger than the first coil gap G1. Set to G2, the first coil gap G1 and the second coil gap G2 are set so that the ratio G2 / G1 of the second coil gap G2 to the first coil gap G1 is 1.5 to 3.0, An induction hardening method for a crankshaft characterized by subjecting a fillet portion and a shaft portion of a portion to be hardened to induction induction heating to cause induction hardening by energizing a heating coil in this state.
According to the induction hardening method for a crankshaft described in this section, by adopting a high-frequency induction heating coil having a heating conductor having a rectangular cross-sectional shape, the heating conductor having a diamond-shaped cross-sectional shape is provided. Compared with the case where a known high-frequency induction heating coil is employed, it is easy to manufacture and adjust the high-frequency induction heating coil (including the core portion), and the manufacturing cost of the high-frequency induction heating coil can be greatly reduced. Further, the first heating surface where the entire surface of the heating conductor is exposed is opposed to the fillet portion of the quenching portion, and the second heating surface where the entire surface of the heating conductor is exposed is opposed to the shaft portion of the quenching portion. The fillet portion and the shaft portion of the portion to be hardened can be induction hardened simultaneously. Furthermore, the first coil gap G1 between the first heating surface of the heating conductor and the fillet portion of the to-be-quenched portion is greater than the second coil gap G2 between the second heating surface of the heating conductor and the shaft portion of the to-be-quenched portion. Is set to a small value, it is possible to uniformly raise the temperature of the shaft portion and the fillet portion, which is relatively difficult to raise the temperature. As a result, the to-be-quenched portion of the crankshaft has a high frequency with a uniform quenching depth. Can be hardened .
さらに、加熱導体の第１加熱辺の長さを第２加熱辺の長さよりも長く設定し、且つ、第１コイルギャップＧ１及び第２コイルギャップＧ２を、第１コイルギャップＧ１に対する第２コイルギャップＧ２の比率Ｇ２／Ｇ１が１．５〜３．０になるように設定することにより、軸部とフィレット部とを均一に昇温させることができ、その結果、クランクシャフトの被焼入部を均一な焼入深さで高周波焼入することができる。 Further, the length of the first heating side of the heating conductor is set longer than the length of the second heating side, and the first coil gap G1 and the second coil gap G2 are set to the second coil gap with respect to the first coil gap G1. By setting the G2 ratio G2 / G1 to be 1.5 to 3.0, it is possible to raise the temperature of the shaft portion and the fillet portion uniformly, and as a result, the hardened portion of the crankshaft is made uniform. Induction hardening can be performed with a deep quenching depth.
（２）クランクシャフトの軸部と該軸部の両端に形成されるフィレット部とを有する被焼入部を高周波焼入するための高周波誘導加熱コイルであって、断面形状が長方形に形成される加熱導体を有して、加熱導体は、全面が露出されて被焼入部のフィレット部に対向する第１加熱面と、全面が露出されて被焼入部の軸部に対向する第２加熱面と、コア部によって被覆されて相互に隣り合う第１被覆面及び第２被覆面とを有して、加熱導体の長方形の断面は、第１加熱面との交線に一致する第１加熱辺の長さが、第２加熱面との交線に一致する第２加熱辺の長さよりも長く設定され、第１加熱面と被焼入部のフィレット部とのコイルギャップが第１コイルギャップＧ１に設定されるとともに、第２加熱面と被焼入部の軸部とのコイルギャップが第１コイルギャップＧ１よりも大きい第２コイルギャップＧ２に設定され、第１コイルギャップＧ１及び第２コイルギャップＧ２は、第１コイルギャップＧ１に対する第２コイルギャップＧ２の比率Ｇ２／Ｇ１が１．５〜３．０になるように設定されることを特徴とする高周波誘導加熱コイル。
本項に記載の高周波誘導加熱コイルによれば、断面形状が長方形に形成された加熱導体を採用したことにより、断面形状が菱形に形成された加熱導体を採用した公知の高周波誘導加熱コイルと比較して、製作及び調整が容易であり、製造コストを大幅に削減することができる。また、加熱導体の全面が露出した第１加熱面を被焼入部のフィレット部に対向させて、且つ加熱導体の全面が露出した第２加熱面を被焼入部の軸部に対向させたことにより、被焼入部のフィレット部と軸部とを同時に高周波焼入することができる。さらに、加熱導体の第１加熱面と被焼入部のフィレット部との間の第１コイルギャップＧ１を加熱導体の第２加熱面と被焼入部の軸部との間の第２コイルギャップＧ２よりも小さく設定したことにより、軸部と相対的に昇温し難いフィレット部とを均一に昇温させることが可能であり、その結果、クランクシャフトの被焼入部を均一な焼入深さで高周波焼入することができる。
( 2 ) A high-frequency induction heating coil for induction-quenching a to-be-quenched portion having a crankshaft shaft portion and fillet portions formed at both ends of the shaft portion, and having a cross-sectional shape formed in a rectangular shape The heating conductor includes a first heating surface that is exposed entirely and faces the fillet portion of the portion to be quenched, and a second heating surface that is exposed entirely and faces the shaft portion of the portion to be quenched, A rectangular cross section of the heating conductor having a first coated surface and a second coated surface that are covered by the core portion and adjacent to each other is the length of the first heated side that coincides with the line of intersection with the first heated surface. Is set to be longer than the length of the second heating side that coincides with the line of intersection with the second heating surface, and the coil gap between the first heating surface and the fillet portion of the hardened portion is set to the first coil gap G1. And the coil gap between the second heating surface and the shaft portion of the hardened portion Is set to the second coil gap G2 greater than the first coil gap G1, the first coil gap G1 and the second coil gap G2, the ratio G2 / G1 of the second coil gap G2 to the first coil gap G1 is 1.5 A high frequency induction heating coil, which is set to be -3.0 .
According to the high-frequency induction heating coil described in this section, by adopting a heating conductor having a rectangular cross-sectional shape, it is compared with a known high-frequency induction heating coil employing a heating conductor having a diamond-shaped cross-sectional shape. Thus, it is easy to manufacture and adjust, and the manufacturing cost can be greatly reduced. Further, the first heating surface where the entire surface of the heating conductor is exposed is opposed to the fillet portion of the quenching portion, and the second heating surface where the entire surface of the heating conductor is exposed is opposed to the shaft portion of the quenching portion. The fillet portion and the shaft portion of the portion to be hardened can be induction hardened simultaneously. Furthermore, the first coil gap G1 between the first heating surface of the heating conductor and the fillet portion of the to-be-quenched portion is greater than the second coil gap G2 between the second heating surface of the heating conductor and the shaft portion of the to-be-quenched portion. Is set to a small value, it is possible to uniformly raise the temperature of the shaft portion and the fillet portion, which is relatively difficult to raise the temperature. As a result, the to-be-quenched portion of the crankshaft has a high frequency with a uniform quenching depth. Can be hardened .
さらに、加熱導体の第１加熱辺の長さを第２加熱辺の長さよりも長く設定し、且つ、第１コイルギャップＧ１及び第２コイルギャップＧ２を、第１コイルギャップＧ１に対する第２コイルギャップＧ２の比率Ｇ２／Ｇ１が１．５〜３．０になるように設定することにより、軸部とフィレット部とを均一に昇温させることができ、その結果、クランクシャフトの被焼入部を均一な焼入深さで高周波焼入することができる。
Further, the length of the first heating side of the heating conductor is set longer than the length of the second heating side, and the first coil gap G1 and the second coil gap G2 are set to the second coil gap with respect to the first coil gap G1. By setting the G2 ratio G2 / G1 to be 1.5 to 3.0, it is possible to raise the temperature of the shaft portion and the fillet portion uniformly, and as a result, the hardened portion of the crankshaft is made uniform. Induction hardening can be performed with a deep quenching depth.
本発明によれば、クランクシャフトの軸部とフィレット部とを均一な焼入深さで高周波焼入することができ、且つ、高周波誘導加熱コイルの製造コストを削減することが可能なクランクシャフトの高周波焼入方法及び高周波誘導加熱コイルを提供することができる。 According to the present invention, a crankshaft of a crankshaft capable of induction hardening the shaft portion and the fillet portion of the crankshaft with a uniform quenching depth and reducing the manufacturing cost of the high frequency induction heating coil. An induction hardening method and an induction heating coil can be provided.
本発明の一実施形態を添付した図を参照して説明する。
本実施形態の高周波誘導加熱コイル１は、クランクシャフトのピン部２（軸部）と該ピン部２の両端に形成されるフィレット部３とを同時に且つ均一な焼入深さで高周波焼入することができるように構成されている。なお、高周波電源、チラーユニット等の、高周波誘導加熱コイル１を除く高周波焼入装置のその他の部分は、公知の高周波焼入装置がそのまま使用されている。そこで、明細書の記載を簡潔にすることを目的に、ここでは高周波焼入装置の詳細な説明を省略する。
An embodiment of the present invention will be described with reference to the accompanying drawings.
The high frequency induction heating coil 1 of the present embodiment performs induction hardening of the pin portion 2 (shaft portion) of the crankshaft and the fillet portions 3 formed at both ends of the pin portion 2 simultaneously and with a uniform quenching depth. It is configured to be able to. In addition, a well-known induction hardening apparatus is used as it is for the other parts of the induction hardening apparatus except the induction induction heating coil 1 such as a high frequency power supply and a chiller unit. Therefore, in order to simplify the description of the specification, a detailed description of the induction hardening apparatus is omitted here.
高周波誘導加熱コイル１は、クランクシャフトのピン部２の周方向（以下、単に周方向という）に沿って延びる半開放鞍型高周波誘導加熱コイルであって、図１に示されるように、加熱導体４とコア部５（磁束集中体）とを有する。なお、図１には、被焼入部のうち、被焼入部の一端側、すなわち、ピン部２の一端側及び該ピン部２の一端に接続されるフィレット部３に対応する加熱導体４及びコア５のみが図解されているが、高周波誘導加熱コイル１が、被焼入部の他端側に対応する加熱導体４及びコア５も備えていることは、当業者に理解されるべきである。 The high frequency induction heating coil 1 is a semi-open saddle type high frequency induction heating coil extending along the circumferential direction of the pin portion 2 of the crankshaft (hereinafter simply referred to as the circumferential direction), and as shown in FIG. 4 and a core portion 5 (magnetic flux concentrator). FIG. 1 shows a heating conductor 4 and a core corresponding to a fillet portion 3 connected to one end side of the to-be-quenched portion, that is, one end side of the pin portion 2 and one end of the pin portion 2. Although only 5 is illustrated, it should be understood by those skilled in the art that the high frequency induction heating coil 1 also includes a heating conductor 4 and a core 5 corresponding to the other end side of the portion to be hardened.
図１に示されるように、加熱導体４は、全面が露出されてクランクシャフトのフィレット部３に対向する第１加熱面６と、全面が露出されてクランクシャフトのピン部２に対向する第２加熱面７と、コア部５によって被覆されて相互に隣り合う第１被覆面８及び第２被覆面９とを有しており、周方向の全域にわたって断面形状が長方形に形成されている。加熱導体４の断面は、第１加熱面６との交線に一致する辺（以下、第１加熱辺６という）の長さＬ１が、第２加熱面７との交線に一致する辺（以下、第２加熱辺７という）の長さＬ２よりも長く設定されている。なお、加熱導体４の第１加熱面６とコア部５の側面１０とは面一（同一平面）に形成されるとともに、加熱導体４の第２加熱面７とコア部５の底面１１とは面一に形成される。 As shown in FIG. 1, the heating conductor 4 has a first heating surface 6 that is exposed on the entire surface and faces the fillet portion 3 of the crankshaft, and a second heating surface 4 that is exposed on the entire surface and faces the pin portion 2 of the crankshaft. It has the heating surface 7 and the 1st coating surface 8 and the 2nd coating surface 9 which were coat | covered with the core part 5, and adjoin each other, and the cross-sectional shape is formed in the rectangular shape over the whole region of the circumferential direction. The cross section of the heating conductor 4 is such that the length L1 of the side that coincides with the line of intersection with the first heating surface 6 (hereinafter referred to as the first heating side 6) coincides with the line of intersection with the second heating surface 7 ( Hereinafter, it is set longer than the length L2 of the second heating side 7). The first heating surface 6 of the heating conductor 4 and the side surface 10 of the core portion 5 are formed flush with each other (the same plane), and the second heating surface 7 of the heating conductor 4 and the bottom surface 11 of the core portion 5 are It is formed flush.
そして、本実施形態のクランクシャフトの高周波焼入方法では、加熱導体４の第１加熱面６とクランクシャフトのフィレット部３とのコイルギャップ及び加熱導体４の第２加熱面７とクランクシャフトのピン部２とのコイルギャップを、各々、第１コイルギャップＧ１及び第２コイルギャップＧ２と定義した場合、第１コイルギャップＧ１に対する第２コイルギャップＧ２の比率Ｇ２／Ｇ１（以下、ギャップ比Ｇ２／Ｇ１という）が、１．５〜３．０になるように設定される。ここで、横軸に第１コイルギャップＧ１を設定するとともに縦軸に第２コイルギャップＧ２を設定した図２に示されるグラフを参照すると、ギャップ比Ｇ２／Ｇ１が適正である領域Ｒ、すなわち、ギャップ比Ｇ２／Ｇ１が１．５〜３．０である領域Ｒは、ギャップ比Ｇ２／Ｇ１（傾き）が３．０である直線Ｌ３．０と、ギャップ比Ｇ２／Ｇ１（傾き）が１．５である直線Ｌ１．５との間の、図２において斜線で示される領域である。 In the induction hardening method for the crankshaft of this embodiment, the coil gap between the first heating surface 6 of the heating conductor 4 and the fillet portion 3 of the crankshaft and the second heating surface 7 of the heating conductor 4 and the pin of the crankshaft When the coil gap with the part 2 is defined as the first coil gap G1 and the second coil gap G2, respectively, the ratio G2 / G1 of the second coil gap G2 to the first coil gap G1 (hereinafter referred to as the gap ratio G2 / G1). Is set to 1.5 to 3.0. Here, referring to the graph shown in FIG. 2 in which the first coil gap G1 is set on the horizontal axis and the second coil gap G2 is set on the vertical axis, the region R in which the gap ratio G2 / G1 is appropriate, that is, In the region R where the gap ratio G2 / G1 is 1.5 to 3.0, the straight line L3.0 where the gap ratio G2 / G1 (slope) is 3.0 and the gap ratio G2 / G1 (slope) are 1. 2 is a region indicated by diagonal lines in FIG.
次に、本実施形態の作用を説明する。
まず、高周波誘導加熱コイル１の加熱導体４をクランクシャフトの被焼入部に対して予め決められたコイルギャップだけ離すようにして、高周波誘導加熱コイル１とクランクシャフトとを相対位置決めさせる。本実施形態における予め決められたコイルギャップは、加熱導体４の第１加熱面６とクランクシャフトのフィレット部３とのコイルギャップが０．７ｍｍ（第１コイルギャップＧ１＝０．７ｍｍ）、及び、加熱導体４の第２加熱面７とクランクシャフトのピン部２（軸部）とのコイルギャップが１．５ｍｍ（第２コイルギャップＧ２＝１．５ｍｍ）である。この場合のギャップ比Ｇ２／Ｇ１は２．１４であり、１．５〜３．０の範囲内（図２における領域Ｒ内）であり適正である。
Next, the operation of this embodiment will be described.
First, the high frequency induction heating coil 1 and the crankshaft are relatively positioned by separating the heating conductor 4 of the high frequency induction heating coil 1 by a predetermined coil gap with respect to the hardened portion of the crankshaft. The predetermined coil gap in the present embodiment is such that the coil gap between the first heating surface 6 of the heating conductor 4 and the fillet portion 3 of the crankshaft is 0.7 mm (first coil gap G1 = 0.7 mm), and The coil gap between the second heating surface 7 of the heating conductor 4 and the pin portion 2 (shaft portion) of the crankshaft is 1.5 mm (second coil gap G2 = 1.5 mm). In this case, the gap ratio G2 / G1 is 2.14, which is in the range of 1.5 to 3.0 (in the region R in FIG. 2) and is appropriate.
この状態で、高周波誘導加熱コイル１に通電してクランクシャフトの被焼入部（ピン部２及びフィレット部３）を高周波誘導加熱しつつ、ピン部２を高周波誘導加熱コイル１に対して軸線回りに一方向へ回転させることにより、被焼入部が全周にわたって高周波焼入れされる。 In this state, the high-frequency induction heating coil 1 is energized to induction-heat the hardened portion (pin portion 2 and fillet portion 3) of the crankshaft while the pin portion 2 is rotated around the axis with respect to the high-frequency induction heating coil 1. By rotating in one direction, the to-be-quenched part is induction-quenched all around.
この実施形態では以下の効果を奏する。
本実施形態によれば、全面が露出されてクランクシャフトのフィレット部３に対向する第１加熱面６と、全面が露出されてクランクシャフトのピン部２（軸部）に対向する第２加熱面７と、コア部５によって被覆されて相互に隣り合う第１被覆面８及び第２被覆面９とを有する断面形状が長方形に形成された加熱導体４を有する高周波誘導加熱コイル１を採用して、第１コイルギャップＧ１（加熱導体４の第１加熱面６とクランクシャフトのフィレット部３とのコイルギャップ）及び第２コイルギャップＧ２（加熱導体４の第２加熱面７とクランクシャフトのピン部２とのコイルギャップ）を、各々、ギャップ比Ｇ２／Ｇ１（第１コイルギャップＧ１に対する第２コイルギャップＧ２の比率Ｇ２／Ｇ１）が１．５〜３．０になるように設定したので、断面形状が菱形に形成された加熱導体を有する公知の高周波誘導加熱コイルを採用した場合と比較して、高周波誘導加熱コイル１（コア部５を含む）の製作及び調整が容易であり、高周波誘導加熱コイル１の製造コストを大幅に削減することができ、且つ、クランクシャフトのフィレット部３とピン部２とを同時に高周波焼入することができる。さらに、第１コイルギャップＧ１を第２コイルギャップＧ２よりも小さく設定したことにより、ピン部２と相対的に昇温し難いフィレット部３とを均一に昇温させることが可能であり、その結果、クランクシャフトの被焼入部を均一な焼入深さで効率的に高周波焼入することができる。
This embodiment has the following effects.
According to the present embodiment, the first heating surface 6 that is exposed entirely and faces the fillet portion 3 of the crankshaft, and the second heating surface that is exposed entirely and faces the pin portion 2 (shaft portion) of the crankshaft. 7 and a high-frequency induction heating coil 1 having a heating conductor 4 that is covered with a core portion 5 and has a first covering surface 8 and a second covering surface 9 adjacent to each other and having a rectangular cross-sectional shape. , The first coil gap G1 (the coil gap between the first heating surface 6 of the heating conductor 4 and the fillet portion 3 of the crankshaft) and the second coil gap G2 (the second heating surface 7 of the heating conductor 4 and the pin portion of the crankshaft). 2) is set such that the gap ratio G2 / G1 (the ratio G2 / G1 of the second coil gap G2 to the first coil gap G1) is 1.5 to 3.0. Therefore, compared with the case where a known high frequency induction heating coil having a heating conductor having a diamond-shaped cross section is adopted, the production and adjustment of the high frequency induction heating coil 1 (including the core portion 5) are easy. The manufacturing cost of the high frequency induction heating coil 1 can be greatly reduced, and the fillet portion 3 and the pin portion 2 of the crankshaft can be induction hardened simultaneously. Furthermore, by setting the first coil gap G1 to be smaller than the second coil gap G2, it is possible to uniformly raise the temperature of the pin part 2 and the fillet part 3 which is relatively difficult to raise, and as a result. In addition, the to-be-quenched portion of the crankshaft can be efficiently induction hardened with a uniform quenching depth.
１ 高周波誘導加熱コイル、２ ピン部（軸部）、３ フィレット部、４ 加熱導体、５ コア部、６ 第１加熱面（第１加熱辺）、７ 第２加熱面（第２加熱辺）、８ 第１被覆面、９ 第２被覆面、１０ コア部側面、１１ コア部底面 1 high frequency induction heating coil, 2 pin part (shaft part), 3 fillet part, 4 heating conductor, 5 core part, 6 first heating surface (first heating side), 7 second heating surface (second heating side), 8 1st covering surface, 9 2nd covering surface, 10 core side surface, 11 core bottom surface
Claims (2)
前記被焼入部は、
軸部と該軸部の両端に形成されるフィレット部とを有して、
前記加熱導体は、
断面形状が長方形に形成されるとともに、全面が露出されて前記被焼入部のフィレット部に対向する第１加熱面と、全面が露出されて前記被焼入部の軸部に対向する第２加熱面と、コア部によって被覆されて相互に隣り合う第１被覆面及び第２被覆面とを有して、
前記加熱導体の長方形の断面は、前記第１加熱面との交線に一致する第１加熱辺の長さが、前記第２加熱面との交線に一致する第２加熱辺の長さよりも長く設定され、
前記第１加熱面と前記被焼入部のフィレット部とのコイルギャップを第１コイルギャップＧ１に設定するとともに、前記第２加熱面と前記被焼入部の軸部とのコイルギャップを前記第１コイルギャップＧ１よりも大きい第２コイルギャップＧ２に設定して、前記第１コイルギャップＧ１及び前記第２コイルギャップＧ２は、前記第１コイルギャップＧ１に対する前記第２コイルギャップＧ２の比率Ｇ２／Ｇ１が１．５〜３．０になるように設定され、この状態で前記加熱コイルに通電することで前記被焼入部のフィレット部と軸部とを高周波誘導加熱させて高周波焼入することを特徴とするクランクシャフトの高周波焼入方法。 A high-frequency induction heating coil is arranged with a heating coil separated from a hardened portion of the crankshaft by a predetermined coil gap, and in this state, the heated portion is energized to cause high-frequency induction heating. And induction hardening,
The hardened part is
Having a shaft portion and fillet portions formed at both ends of the shaft portion;
The heating conductor is
A first heating surface that has a rectangular cross-sectional shape and is exposed to the entire fillet portion of the to-be-quenched portion, and a second heating surface that has the entire surface exposed to the shaft portion of the to-be-quenched portion. And a first covering surface and a second covering surface which are covered with the core portion and are adjacent to each other,
In the rectangular cross section of the heating conductor, the length of the first heating side that coincides with the line of intersection with the first heating surface is longer than the length of the second heating side that coincides with the line of intersection with the second heating surface. Set longer,
The coil gap between the first heating surface and the fillet portion of the to-be-quenched portion is set to the first coil gap G1, and the coil gap between the second heating surface and the shaft portion of the to-be-quenched portion is set to the first coil. The first coil gap G1 and the second coil gap G2 are set to a second coil gap G2 that is larger than the gap G1, and the ratio G2 / G1 of the second coil gap G2 to the first coil gap G1 is 1. In this state, the heating coil is energized by induction induction heating of the fillet portion and the shaft portion of the to-be-quenched portion, and induction hardening is performed. Induction hardening method for crankshaft.
断面形状が長方形に形成される加熱導体を有して、
前記加熱導体は、全面が露出されて前記被焼入部のフィレット部に対向する第１加熱面と、全面が露出されて前記被焼入部の軸部に対向する第２加熱面と、コア部によって被覆されて相互に隣り合う第１被覆面及び第２被覆面とを有して、
前記加熱導体の長方形の断面は、前記第１加熱面との交線に一致する第１加熱辺の長さが、前記第２加熱面との交線に一致する第２加熱辺の長さよりも長く設定され、
前記第１加熱面と前記被焼入部のフィレット部とのコイルギャップが第１コイルギャップＧ１に設定されるとともに、前記第２加熱面と前記被焼入部の軸部とのコイルギャップが前記第１コイルギャップＧ１よりも大きい第２コイルギャップＧ２に設定され、前記第１コイルギャップＧ１及び前記第２コイルギャップＧ２は、前記第１コイルギャップＧ１に対する前記第２コイルギャップＧ２の比率Ｇ２／Ｇ１が１．５〜３．０になるように設定されることを特徴とする高周波誘導加熱コイル。 A high-frequency induction heating coil for induction-quenching a hardened portion having a crankshaft shaft portion and fillet portions formed at both ends of the shaft portion,
Having a heating conductor whose cross-sectional shape is formed in a rectangle,
The heating conductor includes a first heating surface that is exposed entirely and faces the fillet portion of the hardened portion, a second heating surface that is exposed and faces the shaft portion of the hardened portion, and a core portion. A first coated surface and a second coated surface which are coated and adjacent to each other;
In the rectangular cross section of the heating conductor, the length of the first heating side that coincides with the line of intersection with the first heating surface is longer than the length of the second heating side that coincides with the line of intersection with the second heating surface. Set longer,
The coil gap between the first heating surface and the fillet portion of the to-be-quenched portion is set to the first coil gap G1, and the coil gap between the second heating surface and the shaft portion of the to-be-quenched portion is the first coil gap. The second coil gap G2 is set to be larger than the coil gap G1, and the first coil gap G1 and the second coil gap G2 have a ratio G2 / G1 of the second coil gap G2 to the first coil gap G1 of 1. A high-frequency induction heating coil, which is set to be 5 to 3.0 .
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