JP2008150640A - High-frequency induction heating coil for heating axial member, and high-frequency induction heating apparatus using the high-frequency induction heating coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-frequency induction heating coil for heating an axial member, which can induction-heat the axial members having different outside diameters with a high-frequency current by using a pair of assemblies of the high-frequency induction heating coil, which constitute the high-frequency induction heating coil, can smoothly induction-heat a corner part of the axial member which is a body to be heated with the high-frequency current, has a simple structure of an apparatus, and can be inexpensively and easily manufactured, and to provide a high-frequency induction heating apparatus using the high-frequency induction heating coil. <P>SOLUTION: This high-frequency induction heating coil comprises: the pair of the assemblies 8a and 8b or 8c of the high-frequency induction heating coil, which are respectively arranged so as to sandwich the axis of the axial member 6 and face to each other, and are arranged to face to the corner part 5 and an axial part 4 of the axial member 6 at a location some distance from the corner part 5 and the axial part 4; and bent coil parts 10a and 10b or 10c which are respectively formed in the pair of the assemblies of the high-frequency induction heating coil and are bent so as to project toward a direction apart from the axis of the axial member 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shaft portion having a flange portion and a shaft portion erected at the central portion of the flange portion, and a flange portion and a shaft portion formed by intersecting the flange portion and the shaft portion. The present invention relates to a high-frequency induction heating coil for heating a shaft-like member for high-frequency induction heating of an outer peripheral surface of a portion and a high-frequency induction heating apparatus using the high-frequency induction heating coil.

  Conventionally, as shown in FIG. 15, when a shaft-shaped member (work) 50 having a cylindrical shaft portion 50a is subjected to high-frequency induction heating for quenching, a high-frequency induction heating coil 51 having a substantially semicircular arc shape is used. This high frequency induction is performed under a state in which the shaft member 50 is opposed to the outer peripheral surface of the shaft portion 50a of the shaft member 50 with a slight gap and the shaft member 50 is rotated about the axis in the direction of the arrow M, for example. By supplying a high-frequency current to the heating coil 51, the outer peripheral surface of the shaft portion 50a of the shaft-shaped member 50 is induction-heated to a required quenching temperature. However, in this method, as shown in FIG. 16, if the outer diameter dimension of the shaft-like member 50 is different, it is necessary to separately prepare the high-frequency induction heating coils 51 having dimensions corresponding to the outer diameter dimensions. The heating coil 51 is required, which increases the cost and requires a lot of time to set the high-frequency induction heating coil 51 in the high-frequency induction heating device, resulting in poor work efficiency.

One means for solving such a problem is a technique described in Japanese Patent Publication No. 36-10457 (Patent Document 1). Inductors for induction hardening described in Japanese Patent Publication No. 36-10457 have a relatively large outer diameter portion of a to-be-hardened body (shaft-shaped member) having two different outer diameters slightly smaller than the outer diameter. High frequency induction heating is performed by a high frequency inductor having a large inner diameter, and a relatively small outer diameter portion of the object to be hardened is high frequency induction by a slider that is slid radially with respect to the above high frequency inductor. It is designed to be heated. Therefore, according to the induction hardening inductor described in Japanese Examined Patent Publication No. 36-10457, the object to be hardened having different outer diameters is obtained by moving (sliding) the slider in the radial direction with respect to the high frequency inductor. Quenching can be performed by induction induction heating, and the above-mentioned problems can be solved.
Japanese Patent Publication No. 36-10457

  However, in the publicly known technology described in Japanese Patent Publication No. 36-10457, the slider arranged to face the outer peripheral surface of the object to be hardened with a slight gap is used when the object to be hardened has a small diameter. Is arranged opposite to the entire outer peripheral surface of the object to be hardened, but when the outer diameter of the object to be hardened is large, a portion that is not disposed opposite to the entire outer peripheral surface is generated. Therefore, there is a problem that the entire outer peripheral surface of the object to be quenched is not uniformly subjected to high-frequency induction heating (and hence quenching treatment). Further, the sliding structure of the slider is complicated, there are problems in the smoothness and stability of the operation, and the whole is expensive. In addition, the addition of a cooling mechanism for preventing the temperature rise of the inductor due to high frequency induction heating and a mechanism for providing a magnetic substance (for example, a dust core or a silicon steel plate) as a magnetic flux concentrating material will further complicate the entire apparatus. There is a problem.

  The present invention has been made in view of the above-described problems, and an object thereof is high-frequency induction heating of a shaft-like member having different outer diameters by a pair of high-frequency induction heating coil components constituting a high-frequency induction heating coil. The rounded portion of the shaft-shaped member that is the object to be heated (the corner or corner of the curved section formed between the flange portion and the shaft portion of the shaft-shaped member intersecting with each other; R The high-frequency induction heating coil for heating the shaft-shaped member and the high-frequency induction heating can be smoothly performed, the apparatus structure is simple, and can be easily produced at low cost. The object is to provide a high-frequency induction heating apparatus using an induction heating coil.

In order to achieve the above-mentioned object, in the present invention, among the shaft-shaped members having a flange portion and a shaft portion standing at the center of the flange portion, the flange portion and the shaft portion intersect each other. In the high frequency induction heating coil for high frequency induction heating of the round portion formed between them and the outer peripheral surface of the shaft portion, the coils are arranged at positions facing each other across the axis of the shaft member, A pair of high-frequency induction heating coils that are disposed opposite to the rounded portion and the shaft portion at a position spaced from the rounded portion and the shaft portion of the shaft-shaped member, and the pair of high-frequency induction heating coils Each of the components is formed with a bent coil portion that is bent so as to protrude in a direction away from the axis of the shaft member.
Further, in the present invention, the bent coil portions of the pair of high frequency induction heating coil constituting bodies are each formed in a dogleg shape.
In the present invention, the bent coil portions of the pair of high-frequency induction heating coil components are each substantially semicircular.
Further, in the present invention, one bent coil portion of the pair of high frequency induction heating coil components has a substantially semicircular arc shape, and the other bent coil portion of the pair of high frequency induction heating coil components is It is made to be the shape of the letter.
In the present invention, a magnetic material for concentrating magnetic flux is attached to the bent coil portion having the substantially semicircular arc shape.
Further, in the present invention, the bent coil portion having the substantially semicircular arc shape is arranged in a state of being inclined toward the rounded portion of the shaft-like member. A high-frequency induction heating coil for heating the shaft-shaped member according to any one of the above.
Further, in the present invention, in the high frequency induction heating apparatus for performing high frequency induction heating of the shaft-shaped member using the high-frequency induction heating coil for heating the shaft-shaped member according to any one of claims 1 to 6,
(A) a first pair of coil holders that respectively hold one end and the other end of one of the pair of high-frequency induction heating coil components constituting the high-frequency induction heating coil;
(B) a second pair of coil holders that respectively hold one end and the other end of the other high-frequency induction heating coil component of the pair of high-frequency induction heating coil components;
(C) The pair of high frequency induction heating coils by moving the first pair of coil holders and the second pair of coil holders toward the shaft-shaped member or in a direction away from the shaft-shaped member. A coil holder moving mechanism for disposing a constituent body at a predetermined position with respect to the shaft-shaped member;
(D) a high frequency power source for supplying power to the pair of high frequency induction heating coil components via the first and second pair of coil holders;
It is made to comprise.

  The present invention according to claim 1 is disposed at positions facing each other across the axis of the shaft-shaped member, and the round-shaped portion and the round-shaped portion of the shaft-shaped member and the shaft portion at positions spaced apart from each other. A pair of high-frequency induction heating coil components arranged opposite to the shaft portion are provided, and the pair of high-frequency induction heating coil components is bent so as to protrude in a direction away from the axis of the shaft-shaped member. Since each of the bent coil portions is formed, a pair of high frequency induction heating coil configurations are formed by sandwiching a shaft member (work) between the bent coil portions of the pair of high frequency induction heating coil components. High-frequency induction heating can be performed stably and reliably in a state in which the body is disposed correspondingly with a clearance from the outer peripheral surface of the shaft-shaped member. That is, by using a pair of high-frequency induction heating coil components, the above-described pair of high-frequency induction heating coil components is arranged corresponding to all of the various shaft-like members having different diameters on the outer peripheral surface. It becomes possible.

  Further, in the present invention described in claim 2, since the bent coil portions of the pair of high-frequency induction heating coil constituent bodies are each formed in a dogleg shape, the pair of high-frequency induction heating coil configurations The pinching of the shaft-like member by the body can be brought into a stable state. Moreover, a pair of high frequency induction heating coil structures can be easily manufactured.

  Further, according to the third aspect of the present invention, since the bent coil portions of the pair of high-frequency induction heating coil constituting bodies are respectively substantially semicircular arc shapes, High-frequency induction heating can be performed more reliably and stably.

  According to the fourth aspect of the present invention, the one bent coil portion of the pair of high frequency induction heating coil components has a substantially semicircular arc shape, and the other bent coil of the pair of high frequency induction heating coil components. Since the portion is shaped like a square, one of the pair of high-frequency induction heating coil components has a semicircular arc-shaped bent coil portion, so the high-frequency induction of the round portion of the shaft-shaped member Heating can be performed stably and reliably.

  According to the fifth aspect of the present invention, since the magnetic material for concentrating the magnetic flux is attached to the substantially semicircular arc-shaped bent coil portion, the substantially semicircular arc-shaped bent coil portion is provided. High-frequency induction heating of the rounded portion of the corresponding shaft-shaped member can be performed more reliably and stably.

  Further, in the present invention described in claim 6, since the bent coil portion having a substantially semicircular arc shape is arranged in a state of being inclined toward the rounded portion of the shaft member, the shaft member High-frequency induction heating of the rounded portion where the flange portion and the shaft portion intersect can be performed more reliably and efficiently.

  Further, the present invention according to claim 7 is the first to hold one end and the other end of one of the high frequency induction heating coil components of the pair of high frequency induction heating coil components constituting the high frequency induction heating coil. A pair of coil holders, a second pair of coil holders for holding one end and the other end of the other high-frequency induction heating coil component of the pair of high-frequency induction heating coil components, The pair of coil holders and the second pair of coil holders are moved toward or away from the shaft-shaped member to move the pair of high-frequency induction heating coil constituents to a predetermined position with respect to the shaft-shaped member. And a high frequency power source for supplying power to the pair of high frequency induction heating coil components via the first and second pair of coil holders. Therefore, when the shaft-shaped member is sandwiched between the pair of high-frequency induction heating coil components and moved along the axis of the shaft-shaped member corresponding to the outer peripheral surface of the shaft-shaped member, the high-frequency induction heating coil is By supplying electric power to the structure, the shaft-shaped members of various sizes can be surely high-frequency induction heated with good workability. In addition, there is an advantage that the structure of the coil holder moving mechanism for expanding and contracting (opening and closing movement) the high-frequency induction heating coil structure is sufficient.

  Hereinafter, a high-frequency induction heating coil 1 for heating a shaft-shaped member according to an embodiment of the present invention and a high-frequency heating apparatus 2 using the high-frequency induction heating coil 1 will be described with reference to FIGS. In the embodiment of the present invention described below, as shown in FIGS. 7 and 10 to 14, the flange portion 3 and the shaft portion 4 erected at the central portion of the flange portion 3 are provided, and The shaft-shaped member 6 having a curved section (corner section) 5 formed between the flange section 3 and the shaft section 4 intersecting with each other serves as a heated body (a work to be heated). The

  1 and 2 show a high-frequency induction heating coil 1 (hereinafter referred to as a high-frequency induction heating coil 1) for heating a shaft-shaped member according to the first embodiment of the present invention. As shown in FIG. 1, the high-frequency induction heating coil 1 includes a pair of high-frequency induction heating coil structural bodies 8a and 8b having the same shape (a left-right symmetric shape with a straight line as the symmetry axis X). The pair of high-frequency induction heating coil structures 8a and 8b in the present embodiment has a pair of straight (straight) coil portions 9a, 9a and 9b, 9b arranged on the same line along the vertical direction in FIG. And between the coil portions 9a, 9a and 9b, 9b, it protrudes in a direction away from the axis of symmetry X (outside) and, in turn, in a direction away from the axis of the shaft-like member 6 that is a heated body. It has bent coil portions (projecting coil portions) 10a and 10b bent in a garlic shape. The linear coil portions 9a and 9b and the bent coil portions 10a and 10b described above are constituted by a hollow pipe 11 as shown in FIG. 2, and a cooling water supply (not shown) is supplied to these hollow portions 12. Cooling water is supplied from the mechanism so that it can circulate. In the present embodiment, the bent coil portions 10a and 10b are formed of a dogleg shape (a shape composed of two sides of a triangle). The bent coil portions 10a and 10b are not particularly limited to the shape of a dogleg shape, and for example, an L-shape having two sides forming a right angle portion of a right triangle may be adopted. Good.

  FIG. 3 shows another embodiment (second embodiment of the present invention) of the high-frequency induction heating coil 1. The high-frequency induction heating coil 1 includes a high-frequency induction heating coil structure 8a having the linear coil portions 9a and 9a and a bent coil-shaped portion 10a shown in FIG. 1, linear coil portions 9c and 9c, It is comprised from the high frequency induction heating coil structure 8c which has the substantially semicircular arc shape or the substantially U-shaped bending coil part 10c provided between these. The above-described substantially semicircular arc-shaped bent coil portion 10c may be used as it is, but as shown in FIGS. 4 and 5, the magnetic flux is concentrated on the curved top portion of the approximately semicircular arc-shaped bent coil portion 10c. A magnetic material (for example, a dust core) 13 having a U-shaped cross section for use is usually used. By using this magnetic material 13, as will be described later, high-frequency induction heating (and hence high-frequency quenching) of the rounded portion 5 of the shaft-shaped member 6 that is an object to be heated (work) can be performed more reliably and efficiently. Although not shown, the pair of high-frequency induction heating coil structures 8c and 8c each having the linear coil portions 9c and 9c and the substantially semicircular arc-shaped bent coil portion 10c shown in FIGS. Of course, the high frequency induction heating coil 1 may be arranged at a symmetrical position.

  Further, the substantially semicircular arc-shaped bent coil portion 10c of one high frequency induction heating coil constituting body 8c is inclined with respect to the linear coil portion 9c as shown in FIG. 5, and is shown in FIG. Thus, it is inclined so as to be directed to the rounded portion 5 of the shaft-shaped member 6 that is the object to be heated. And the coil part P (refer FIG. 5) which is not surrounded by the magnetic material 13 of a U-shaped cross section faces the rounded part 5 side of the shaft-shaped member 6, and is arranged oppositely.

  Next, the high frequency induction heating apparatus 2 using the high frequency induction heating coil 1 shown in FIGS. 3 to 5 will be described with reference to FIGS. 6 and 7. The high frequency induction heating device 2 is provided with a cooling mechanism as will be described later, and is a high frequency quenching device.

  First, the high frequency induction heating device 2 includes a device base 15, a pair of coil holders 16a, 16b and 17a, 17b for holding a pair of high frequency induction heating coil structures 8a, 8c, and a pair of high frequency induction heating coils. The above-described coil holders 16a, 16b and 17a, 17b are used to move the structural bodies 8a, 8c toward the shaft portion 4 of the shaft-shaped member 6 or in a direction away from the shaft-shaped member 6 and set them at desired positions. Is moved according to the diameter (size) of the shaft-like member 6 and power is supplied to the pair of high-frequency induction heating coil components 8a and 8c via the coil holders 16a and 16b and 17a and 17b. And a high-frequency power supply 19 to be supplied.

  Each of the end portions (both ends of the high frequency induction heating coil structure 8a) of the linear coil portions 9a and 9a of the high frequency induction heating coil structure 8a of the high frequency induction heating coil structures 8a and 8c described above is a plate. The upper and lower coil holders 16a and 16b in FIG. 6 are connected to each other by a construction plate 20 made of an insulating material. Further, the end portions of the linear coil portions 9c and 9c of the other high-frequency induction heating coil 8c (both ends of the high-frequency induction heating coil constituting body 8c) are fixed to coil holders 17a and 17b made of plate-like members. The upper and lower coil holders 17a and 17b in Fig. 6 are connected to each other by a construction plate 21 made of an insulating material. The upper coil holder 16a and the coil holder 17a in FIG. 6 are stacked one above the other through an insulating plate (not shown), while the lower coil holder 16b and the coil holder 17b in FIG. Closely stacked one above the other. The coil holders 16a, 16b and 17a, 17b are made of conductive plate-like members. The upper coil holder 16a and the coil holder 17a are electrically insulated by an insulating plate (not shown), while the lower side The coil holder 16b and the coil holder 17b are electrically connected to each other.

  The coil holder moving mechanism 18 described above includes four guide members 22 fixedly arranged on the apparatus base 15 and four sliding plates 23 guided and moved along the guide members 22. It is configured. And each coil holder 16a, 16b, 17a, 17b is each connected with the above-mentioned sliding plate 23, Thereby, each coil holder 16a, 16b, 17a, 17b is attached to the guide member 22 with the sliding plate 23, respectively. Each is supported in a slidable state. Furthermore, on the device base 15, a rotary table (see FIGS. 7 and 13) 35 for rotating the shaft-like member 6 around its axis is disposed. Further, a high frequency power supply 19 is connected to the upper coil holders 16a and 17a in FIG. 6, and the coil holders 16a, 16b, 17a, A required high-frequency current flows through the high-frequency induction heating coil components 8a and 8c via 17b.

  The coil holders 16a, 16b, 17a, and 17b described above are supported by the guide member 22 via the sliding plate 23, and therefore can move in directions close to or away from each other. A moving mechanism is provided for moving the induction heating coil constituting bodies 8a and 8c in a direction in which they are brought closer to each other and a direction in which they are moved away from each other (opening / closing direction with the shaft-like member 6 sandwiched therebetween). The moving mechanism in the present embodiment is composed of pins 24a and 24b attached to the coil holders 16a and 17b, respectively, and cylinders (not shown) that drive these pins 24a and 24b in the left-right direction in FIG. Yes. The moving mechanism is not limited to the above-described configuration, and may be an arbitrary configuration.

  As shown in FIGS. 6 and 7, the high-frequency induction heating device 2 is provided with various cooling means. One of them is a main jacket 26 and auxiliary jackets 27 and 27 that are arranged around the high-frequency induction heating coil 8a and the high-frequency induction heating coil 8c to cool the shaft-like member 6, and quenching cooling water is supplied to these. The quenching cooling water supply parts 28 and 28 to send are provided. Moreover, the coil cooling water supply parts 29 and 29 which send coil cooling water to the high frequency induction heating coil 8a and the high frequency induction heating coil 8c, and coil cooling which discharges coil cooling water from the high frequency induction heating coil 8a and the high frequency induction heating coil 8c. Water discharge units 30 and 30 are provided. Further, a contact cleaning shower 31 for cooling and cleaning around the coil holders 16a, 16b, 17a, 17b is provided.

  Next, the operation | movement at the time of performing the hardening process by induction-heating the shaft-shaped member 6 with the above-mentioned high frequency induction heating apparatus 2 is demonstrated.

  First, the moving mechanism described above is operated to move the high-frequency induction heating coil constituting bodies 8a and 8c, and as shown in FIGS. 6 and 7, the bent coil portion 10a and the high-frequency induction heating coil of the high-frequency induction heating coil constituting body 8a. The bent coil portions 10c of the structural body 8c are arranged at positions facing each other across the axis of the shaft-shaped member 6, and are slightly spaced from the rounded portion 5 and the shaft portion 4 of the shaft-shaped member 6. It arrange | positions facing the round part 5 and the axial part 4 in a position. At this time, the dog-shaped bent coil portion 10a of the high-frequency induction heating coil 8a is disposed so as to sandwich the shaft portion 4 as shown in FIG. 6, and the substantially semicircular arc shape of the high-frequency induction heating coil 8c. In the bent coil portion 10c, the coil portion P that is not surrounded by the U-shaped magnetic material 13 (see FIG. 5) is inclined toward the round portion 5 side of the shaft-shaped member 6 as shown in FIG. Deploy. Under such a state, a high-frequency current is supplied from the high-frequency power source 19 to the high-frequency induction heating coils 8a and 8c via the coil holders 16a and 16b and 17a and 17b, and the shaft-like member 6 is rotated about its axis. In addition, high-frequency induction heating is performed while moving the shaft-like member 6 along the direction of the axis as appropriate.

  In FIG. 6, an arrow α indicates the direction in which a high-frequency current flows at a certain moment. Thus, since the magnetic material 13 is provided in the bent coil portion 10c of the high frequency induction heating coil 8c, the rounded portion 5 of the shaft-like member 6 is reliably secured by the bent coil portion 10c of the high frequency induction heating coil 8c. In addition, high-frequency induction heating is performed stably, and thereafter quenching treatment is performed as quenching cooling water is injected from the main jacket 26 and the auxiliary jacket 27.

  When the shaft-like member 6 having the shaft portion 4 having a relatively small diameter as shown in FIG. 8 is subjected to high-frequency induction heating (and thus induction hardening), as shown in FIG. While using the high frequency induction heating coil 1 which arranges the two high frequency induction heating coils 8a and 8b each having the coil portions 10a and 10b symmetrically, the two high frequency induction heating coils 8a and 8a are moved by the moving mechanism described above. The high frequency induction heating coils 8a and 8b are moved so that the top portions (corner portions) of the bent coil portions 10a and 10a are close to each other, and formed by the bent coil portions 10a and 10b of the high frequency induction heating coils 8a and 8b. The shaft portion 4 of the shaft-shaped member 6 is disposed in a relatively small rectangular space 32, and the shaft portion 4 of the shaft-shaped member 6 is surrounded by the bent coil portions 10a and 10b. To. As a result, the shaft portion 4 of the shaft-shaped member 6 is surrounded by the bent coil portions 10a and 10b of the high-frequency induction heating coil constituting bodies 8a and 8a with a slight gap therebetween. Then, the shaft-like member 6 is rotated around the axis and moved relative to the high-frequency induction heating coil constituents 8a and 8b along the axis while being fed from the high-frequency power source 19 to the high-frequency induction heating coil constituents 8a and 8b. In FIG. 8, high-frequency induction heating is performed by flowing a high-frequency current in the direction indicated by an arrow α, and then quenching treatment is performed by injecting quenching cooling water from the quenching cooling water supply units 28 and 28. In FIG. 8, the arrow β indicates the direction in which the coil cooling water flows.

  On the other hand, FIG. 9 shows a case where the shaft-like member 6 having the shaft portion 4 having a relatively large diameter is subjected to high-frequency induction heating. In this case, as shown in FIG. 9, two high-frequency induction heating coils 8a and 8b each having a bent-shaped bent coil portion 10a and 10b are arranged symmetrically and used as described above. The mechanism moves the top portions (corner portions) of the bent coil portions 10a and 10b of the two high-frequency induction heating coils 8a and 8b away from each other, and is relatively large formed by these bent coil portions 10a and 10b. The shaft-shaped member 6 is disposed in the rectangular space portion 32 so that the shaft-shaped member 6 is surrounded by the bent coil portions 10a and 10b. As a result, the shaft-like member 6 is in a state in which the entire circumference thereof is surrounded by the bent coil portions 10a, 10b of the high-frequency induction heating coil constituting bodies 8a, 8b via a slight gap. 8 is rotated from the high-frequency power source 19 to the high-frequency induction heating coil constituents 8a and 8b while rotating relative to the high-frequency induction heating coil constituents 8a and 8b along the axis. High-frequency induction heating is performed by flowing a high-frequency current in the direction indicated by an arrow α, and then quenching is performed by spraying cooling water from the quenching / cooling water supply units 28 and 28. In FIG. 9, the flow of coil cooling water is the same as that in FIG. 8, so the arrow β indicating the direction of the flow is omitted.

  10 to 12 show various shapes of the shaft-like member 6 that is subjected to high-frequency induction heating and high-frequency hardening using the high-frequency induction heating coil 1 according to the embodiment of the present invention. The shaft-shaped member 6 is composed of a flange portion 3 and shaft portions 4a and 4b that are provided upright at the central portion of the flange portion 3 and have different diameters. The portion where the flange portion 3 and the shaft portion 4a intersect is rounded. Part 5 is formed. The shaft-shaped member 6 in FIG. 10 is obtained by induction heating and induction hardening of the rounded portion 5, the shaft portion 4a (lower large-diameter portion), and 4b (small-diameter portion on the top side). The shaft-shaped member 6 shown in FIG. 12 is obtained by induction-heating and induction-hardening only the round portion 5 and the shaft portion 4a (lower large-diameter portion), and FIG. 12 is a schematic view of the round portion 5 and the shaft portions 4a and 4b. The entire length is induction-heated and induction-quenched. In this case, the high frequency induction heating coils 8a, 8b, or 8c as described above are appropriately used in the portion to be induction hardened for any of the shaft members 6, and are arranged at positions where the shaft member 6 is sandwiched. The high-frequency induction heating coils 8a, 8b, or 8c or the shaft-shaped member 6 is relatively moved along the axial direction while rotating the shaft-shaped member around the axis, and only the desired quenching portion is subjected to high-frequency induction heating. And induction hardening. 10 to 12, S indicates a hardened hardening layer.

  On the other hand, FIG. 13 shows the center support of the shaft-like member 6 and its rotation mechanism during induction hardening. The shaft-like member 6 is placed in a standing state on the turntable 35 with the flange portion 3 placed on the turntable 35 (see FIG. 7) and supported by the upper and lower center members 36 and 37. The rotary table 35 is provided with a cleaver pin 39 urged by a spring 38 at a position away from the center member 37, and the kerele pin 39 is configured to fit into the eccentric hole 40 of the flange portion 3 of the shaft-like member 6. ing. With the above support structure, as the turntable 35 rotates, the shaft-like member 6 is supported by the center members 36 and 37 via the pin pin 39 and rotates.

  FIG. 14 shows a hardened hardened layer S formed on the shaft-like member 6 that has been induction-hardened by high-frequency induction heating using the high-frequency induction heating device 2 described above. As is apparent from FIG. 14, it can be seen that the hardened and hardened layer S is formed at a desired depth in a desired portion of the shaft-like member 6.

  Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications and changes can be made based on the technical idea of the present invention. For example, in the above-described embodiment, the shape of the shaft-like member 6 and the configuration of the induction hardening apparatus 2 are limited. However, the present invention is not limited thereto, and those in the same technical category are employed. Of course. The present invention also relates to a high-frequency induction heating coil and a high-frequency induction heating apparatus using the high-frequency induction heating coil for stably and reliably high-frequency induction heating of a shaft-shaped member (workpiece) having a shaft portion. It is possible to deal with all of the various types of shaft-like members that can be heated by high-frequency induction by sandwiching the shaft-like member with a slight interval between two high-frequency induction heating coil structures each having a portion. In the above-described embodiment, the high-frequency induction heating coil structure 8a and the high-frequency induction heating coil structure 8b are arranged symmetrically opposite to each other, and the high-frequency induction heating coil 1 and the high-frequency induction heating coil structure 8a and the high-frequency The high-frequency induction heating coil 1 formed by opposingly arranging the induction heating coil structure 8c is used. However, the present invention is not limited to this, and there are two bent coil portions 10c each having a substantially semicircular arc shape or a substantially U shape. It is also possible to use a high frequency induction heating coil formed by arranging the high frequency induction heating coil constituting bodies 8c, 8c symmetrically facing each other.

It is a top view which shows the high frequency induction heating coil which concerns on embodiment of this invention which consists of two high frequency induction heating coil structures which each have a dogleg-shaped bending coil part. It is the sectional view on the AA line of FIG. It is a top view which shows the high frequency induction heating coil which consists of the high frequency induction heating coil structure which has the bent coil part of a shape, and the high frequency induction heating coil structure which has a substantially semicircular arc shaped bent coil part. It is a top view which shows the high frequency induction heating coil structure body which provides a magnetic material in the bending coil part of a substantially semicircular arc shape. It is the BB sectional view taken on the line of FIG. It is a top view which shows roughly the structure of the high frequency induction heating apparatus using the high frequency induction heating coil which concerns on embodiment of this invention. It is a front view of the high frequency induction heating apparatus of FIG. It is a top view for demonstrating arrangement | positioning relationship of a high frequency induction heating coil and a shaft-shaped member at the time of carrying out high-frequency induction heating of a shaft-shaped member to a comparatively small diameter with the high frequency induction heating apparatus which concerns on embodiment of this invention. It is a top view for demonstrating the arrangement | positioning relationship of a high frequency induction heating coil and a shaft-shaped member at the time of carrying out high frequency induction heating of the comparatively large diameter shaft-shaped member with the high frequency induction heating apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the shaft-shaped member quenching using the high frequency induction heating apparatus which concerns on embodiment of this invention. It is sectional drawing which shows another shaft-shaped member by which the hardening process was carried out using the high frequency induction heating apparatus which concerns on embodiment of this invention. It is sectional drawing which shows another shaft-shaped member by which the hardening process was carried out using the high frequency induction heating apparatus which concerns on embodiment of this invention. It is sectional drawing for demonstrating the support structure of the shaft-shaped member heated by high frequency induction heating with the high frequency induction heating apparatus which concerns on embodiment of this invention. It is sectional drawing which shows the state of the hardening hardening layer of the shaft-shaped member by which induction hardening was made by the high frequency induction heating apparatus which concerns on embodiment of this invention. It is a schematic diagram for demonstrating the conventional high frequency induction heating method. It is a schematic diagram for demonstrating the conventional high frequency induction heating method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 High frequency induction heating coil 2 High frequency induction heating apparatus 3 Flange part 4 Shaft part 5 Round part 6 Shaft-shaped member (workpiece)
8a, 8b, 8c High-frequency induction heating coil structure 9a, 9b, 9c Linear coil part 10a, 10b, 10c Bent coil part 13 Magnetic material 15 Device base 16a, 16b Coil holder 17a, 17b Coil holder 18 Coil holder movement Mechanism part 19 High frequency power source 20, 21 Construction plate 22 Guide member 23 Sliding plate 35 Turntable

Claims (7)

Of the shaft-shaped member having a flange portion and a shaft portion erected at the center portion of the flange portion, the flange portion and the shaft portion intersect with each other and the round portion formed between them and the shaft portion In the high frequency induction heating coil for heating the shaft-shaped member for high frequency induction heating of the outer peripheral surface of
The shaft-shaped member is disposed at positions facing each other across the axis of the shaft-shaped member, and is disposed to face the rounded portion and the shaft portion at a position spaced from the rounded portion and the shaft portion of the shaft-shaped member. Comprising a pair of high frequency induction heating coil constructions to be
Forming the bent coil portions bent so as to protrude in a direction away from the axis of the shaft-shaped member in the pair of high-frequency induction heating coil structures,
A high frequency induction heating coil for heating a shaft-like member characterized by   2. The high frequency induction heating coil for heating a shaft-shaped member according to claim 1, wherein each of the bent coil portions of the pair of high frequency induction heating coil constituting bodies has a dogleg shape.   2. The high frequency induction heating coil for heating a shaft-shaped member according to claim 1, wherein each of the bent coil portions of the pair of high frequency induction heating coil structures has a substantially semicircular arc shape.   One bent coil portion of the pair of high-frequency induction heating coil components is substantially semicircular, and the other bent coil portion of the pair of high-frequency induction heating coil components is a dogleg shape. The high frequency induction heating coil for heating a shaft-shaped member according to claim 1.   5. The high-frequency induction heating coil for heating a shaft-shaped member according to claim 3, wherein a magnetic material for concentrating magnetic flux is attached to the bent coil portion having a substantially semicircular arc shape.   6. The bent coil portion having the substantially semicircular arc shape is arranged in a state of being inclined toward a rounded portion of the shaft-shaped member. High frequency induction heating coil for heating the shaft-shaped member. A high-frequency induction heating device for performing high-frequency induction heating of a shaft-shaped member using the high-frequency induction heating coil for heating the shaft-shaped member according to any one of claims 1 to 6,
(A) a first pair of coil holders that respectively hold one end and the other end of one of the pair of high-frequency induction heating coil components constituting the high-frequency induction heating coil;
(B) a second pair of coil holders that respectively hold one end and the other end of the other high-frequency induction heating coil component of the pair of high-frequency induction heating coil components;
(C) The pair of high frequency induction heating coils by moving the first pair of coil holders and the second pair of coil holders toward the shaft-shaped member or in a direction away from the shaft-shaped member. A coil holder moving mechanism for disposing a constituent body at a predetermined position with respect to the shaft-shaped member;
(D) a high frequency power source for supplying power to the pair of high frequency induction heating coil components via the first and second pair of coil holders;
A high frequency induction heating coil device comprising:

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