JPH0662499U - High frequency heating coil - Google Patents

Abstract

(57) [Summary] [Purpose] Circumferential surface 30 of the cylindrical work 300 with the recess 302.
A high-frequency heating coil capable of heating 1 to the quenching temperature including the recess 302 is provided. [Structure] The heating coil 100 is arranged so as to face a recess 302 and a pair of heating conductors 105 and 106 arranged in parallel with the axis 305 of the cylindrical work 300 so as to closely face and face the peripheral surface 301. Silicon steel core mounted on heating conductors 105 and 106
119 and 120, and ferrite cores 111 to 118 mounted on the heating conductors 105 and 106 so as to face the peripheral surface 301 of the work 300 other than the recess 302. The ferrite cores 111 to 118 are arranged in a zigzag pattern.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a high-frequency heating coil (hereinafter, the high-frequency heating coil is simply referred to as a heating coil), and more particularly to a high-frequency heating coil suitable for heating a peripheral surface of a cylindrical work having a recess.

[0002]

[Prior art]

 Hereinafter, a conventional technique will be described with reference to the drawings. 3 and 4 are drawings for explaining a conventional technique, and FIGS. 3 (a) and 3 (b) are a side view and a perspective view, respectively, of a cylindrical work having a recess on the peripheral surface. 3 (c) and 3 (d) are cross-sectional views taken along the line AA of FIG. 3 (a), respectively. FIG. 4 (a) is an explanatory view of a method for heating the peripheral surface of a cylindrical work having no recess on the peripheral surface, and FIG. 4 (b) is a sectional view of the quenched work.

As shown in FIGS. 4A and 4B, in order to form a hardened layer 404 having a uniform depth on the peripheral surface 401 of a cylindrical work 400, first, a line coil, which is a kind of heating coil, is formed. The peripheral surface 401 of the workpiece 400 is heated using the tool 200. The line coil 200 includes a pair of parallel-arranged lead conductors 201 and 202, heating conductors 203 and 204 each having one end connected to one end of each of the lead conductors, and heating conductors 203 and 204 having a substantially arc shape. A pair of linear heating conductors 205 and 206, one ends of which are respectively connected to the other ends of the conductors 203 and 204, and an approximately 1/2 arc-shaped heating conductor 207 which is connected between the other ends of the heating conductors 205 and 206. It has and.

After supporting both ends of the work 400 so that the work 400 can rotate, while rotating the work 400 around the axis 205, a high-frequency current is supplied from a high-frequency power source (not shown) to the lead conductors 201 and 202. After supplying for a predetermined time, the quenching liquid is sprayed onto the peripheral surface 401 of the work 400 from a quenching liquid spraying jacket (not shown), or the work 400 is immersed in the quenching liquid to cool the work 400. The hardened layer 404 can be formed on the peripheral surface 401 of the work 400.

[0005]

[Problems to be solved by the device]

 However, when there is a recess on the peripheral surface of the cylindrical work, that is, on the peripheral surface 301 of the cylindrical work 300, as shown in FIGS. There is a recess 302 that is also partial in the direction of the axis 305, and it is required to form a hardened layer 304 as shown in FIG. 3D over the entire bottom surface 303 of this recess 302. Sometimes. In this case, the peripheral surface 301 of the work 300 is heated using the line coil 200 in the same manner as the peripheral surface 401 of the workpiece 400, and then cooled to be hardened to the bottom surface 303 of the recess 302. An attempt was made to form the layer 304, but it was not possible to form a hardened layer on the bottom surface 303 of the recess 302, as shown in the cross section of the work in the recess 302 in FIG.

The present invention was devised in view of the above circumstances, and a high-frequency processing capable of heating up to a quenching temperature including a recess on the peripheral surface of a substantially cylindrical work having a recess on the peripheral surface. The purpose is to provide a thermal coil.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, the heating coil of the present invention is a high-frequency heating coil that heats a peripheral surface of a substantially cylindrical work having a recess, and is parallel to the axis of the cylindrical work and closely faces the peripheral surface. Pair of linear heating conductors arranged in such a manner, a silicon steel core mounted on each heating conductor so as to face the recess, and a peripheral surface of the work other than the recess. It has a ferrite core attached to each heating conductor. The ferrite cores attached to the heating conductor are preferably arranged in a staggered pattern.

[0008]

【Example】

 Hereinafter, a heating coil according to an embodiment of the present invention will be described with reference to the drawings. 1 and 2 are drawings for explaining the present embodiment. FIG. 1 is a plan view of a heating coil and a vertical sectional view of a work, and FIG. 2 is a perspective view of the heating coil. As the cylindrical work, the same cylindrical work 300 as described in the related art is adopted.

As shown in FIGS. 1 and 2, the heating coil 100 of the present embodiment is similar to the above-mentioned line coil 200, in that a pair of lead conductors 101 and 102 arranged in parallel with each other are provided. A pair of heating conductors 103 and 104, each of which has one end connected to one end of each of the conductors 101 and 102, and a linear one having one end connected to the other end of each of the heating conductors 103 and 104. It comprises a pair of heating conductors 105, 106 and a heating conductor 107 having a substantially half arc shape connected between the other ends of the heating conductors 105, 106. A high frequency power supply 150 is connected between the other ends of the lead conductors 101, 102. Each of the conductors 101 to 107 is composed of a square tube made of a good conductive metal.

When the peripheral surface 301 of the work 300 is heated by using the heating coil 100, the heating conductors 105 and 106 are arranged so as to closely approach the peripheral surface 301 of the work 300 and to be parallel to the axis 305 of the work 300. The heating conductors 103, 104 and the heating conductor 107 are arranged so as to approach and face the circumferential surface 301 in the circumferential direction of the circumferential surface 301, respectively. When the heating conductors 105 and 106 are thus arranged, the surfaces of the heating conductors 105 and 106 facing the work 300 are excluded at the respective positions facing the recesses 302 of the heating conductors 105 and 106. Cores 119 and 120 made of silicon steel plates are mounted so as to cover the surfaces. The width M of these cores 119 and 120 (distance in the direction of the axis 305 of the work 300) is preferably 1/2 or less of the width L of the recess 30 2.

In addition to the core 19, ferrite cores 111, 112, 113, and 114 made of ferrite are attached to the heating conductor 105 so as to cover the surface of the heating conductor 105 that does not face the workpiece 300. In addition to the core 120, the heating conductor 106 is provided with ferrite cores 115, 116, 117, and 118 so as to cover the surface of the heating conductor 106 not facing the work 300. The cores 111 to 118 are arranged in a staggered pattern. In other words, for example, the core 115 is mounted in the position corresponding to the void between the cores 111 and 112, and the core 113 is positioned in the position corresponding to the void between the cores 120 and 117, for example. It is installed.

Next, quenching of the peripheral surface 301 of the work 300 by the heating coil 100 will be described. First, both ends of the work 300 are supported by a center or the like (not shown) so that the work 300 can rotate around the shaft core line 305. Next, the heating conductors 105, 106 are parallel to the axis 305 and closely face the circumferential surface 301, and the heating conductors 103, 104, 107 closely face the circumferential surface 301 in the circumferential direction of the circumferential surface 301. The heating coil 100 is installed in the room.

After that, while rotating the work 300 about the axis 305 by a rotation driving device (not shown), a high-frequency current is passed from the high-frequency power supply 150 to the heating coil 100 for a predetermined time to make the peripheral surface 301 of the work 300 concave. Heating is performed including the bottom surface 303 of the place 302. During this heating, since the ferrite cores 111 to 118 are arranged in a zigzag manner as described above, the magnetic flux generated from the cores 111 to 118 is almost uniform on the peripheral surface 301 where the recess 302 is not formed. In addition, as a result of crossing with a density of an appropriate size, the peripheral surface 301 other than the recess 302 is heated to the quenching temperature.

Further, since the magnetic flux focusing action of each of the silicon steel plate cores 119 and 120 is larger than the magnetic flux focusing action of each of the ferrite cores 111 to 118, it is sufficient for the bottom surface 303 of the recess 302. As a result of crossing the magnetic flux, the bottom surface 303 is also heated to a predetermined quenching temperature.

After heating by the heating coil 100 including the bottom surface 303 of the recess 302 of the peripheral surface 301, the quenching liquid is sprayed onto the work 300 while continuing to rotate around the shaft core line 305 of the work 300. Alternatively, by immersing the work 300 in a quenching liquid and cooling it, the hardened layer 304 shown in FIG. 1 is shown on the peripheral surface 301, and of course, the bottom surface 303 of the recess 302 is also shown in FIG. The hardened layer 304 having such a predetermined depth can be formed.

[0016]

[Effects of the Invention] As described above, the heating coil of the present invention is a heating coil that heats the peripheral surface of a substantially cylindrical work having a recess, and the heating coil is parallel to the axis of the cylindrical work. A pair of heating conductors arranged so as to closely face the surface, a core made of a silicon steel plate attached to each heating conductor so as to face the recess, and a periphery of the work other than the recess. And a ferrite core attached to each heating conductor so as to face the surface. The ferrite cores mounted on the heating conductor can then be arranged in a staggered pattern.

Therefore, when the heating coil of the present invention heats the peripheral surface of the substantially cylindrical work having the recess, the bottom surface of the recess is sufficiently heated to the quenching temperature by the strong magnetic flux converging action of the silicon steel plate. In addition, since the peripheral surface other than the recess is heated to the quenching temperature by the ferrite core, it is possible to form a hardened layer having a predetermined depth on the peripheral surface of the work including the recess.

[Brief description of drawings]

FIG. 1 is a plan view of a heating coil and a vertical sectional view of a work according to an embodiment of the present invention.

FIG. 2 is a perspective view of a heating coil according to an embodiment of the present invention.

3 (a) is a side view of the work, FIG. 3 (b) is a perspective view of the work, and FIGS. 3 (c) and 3 (d) are respectively,
FIG. 4C is a sectional view taken along the line AA of FIG.
Shows a case where an unsatisfactory hardened layer is formed, and FIG. 3D shows a case where a satisfactory hardened layer is formed.

FIG. 4 (a) is an explanatory view of a method for heating the peripheral surface of a cylindrical work having no recess on the peripheral surface, and FIG. 4 (b) is a sectional view of the quenched work.

[Explanation of symbols]

 100 Heating coil 103-107 Heating conductor 111-118 Ferrite core 119, 120 Silicon steel plate core 300 Work piece 301 Circumferential surface 302 Recess 303 Bottom surface 304 Hardened layer 305 Shaft core wire

Claims (2)

[Scope of utility model registration request] 1. A high-frequency heating coil for heating a peripheral surface of a substantially cylindrical work having a recess, the pair of pair being arranged parallel to the axis of the cylindrical work so as to approach and face the peripheral surface. A linear heating conductor, a core made of a silicon steel plate attached to each heating conductor so as to face the recess, and a heating conductor attached so as to face the peripheral surface of the workpiece except the recess. A high frequency heating coil comprising a ferrite core. 2. The high frequency heating coil according to claim 1, wherein the ferrite cores attached to the heating conductor are arranged in a staggered pattern.