JPH065186U - High frequency heating coil - Google Patents

Abstract

(57) [Abstract] [Purpose] If the heating coil 30 is energized, no arc will occur even if it contacts the work. Does not deteriorate due to the radiant heat of the heated work. [Structure] The heating coil 30 is disposed so as to face the inner peripheral surface of the work, and has a cross-section of approximately 4 mm for heating the inner peripheral surface of the work.
A square and annular heating conductor 31, an outer peripheral surface 32 facing the inner peripheral surface of the work of the heating conductor 31, and both side surfaces 3 adjacent to the outer peripheral surface 32.
A contact prevention and heat shield piece 10 comprising a plurality of substantially U-shaped insulating ceramics adhered to 3, 33 and provided with projections 13 projecting in opposite directions and away from each other at both ends; , A contact prevention / heat shield piece retaining ring 20 provided with an annular convex portion 21 that engages with all the projections 13 in the periphery.

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 also simply referred to as a heating coil), and in particular, even if it comes into contact with a work, it is not damaged by an arc and is not deteriorated by the radiant heat of the heated work. Regarding high frequency heating coil.

[0002]

[Prior art]

 Conventionally, for example, when quenching the inner peripheral surface of an annular work, an annular heating coil 90 as shown in FIG. 5 is used. The heating coil 90 includes a heating conductor 91 having a square cross section and an annular shape, and a pair of power supply conductors 94 and 95 connected to both ends of the cutting point of the heating conductor 91 via insulating plates 93. There is.

In order to perform high frequency induction heating on the inner peripheral surface of the annular work, the outer peripheral surface 92 of the heating coil 90 is arranged so as to face the inner peripheral surface of the work, and then a high frequency current is passed through the heating coil 90. Then, the inner peripheral surface of the work is heated.

[0004]

[Problems to be solved by the device]

 When performing such heating, due to the misalignment of the position of the jig on which the work is placed, the vibration of the heating device body that supports the heating coil, etc. The coil comes into contact with the work, and the arc generated by this contact damages the surface of the heating coil and causes it to sink, or this damage causes a hole in the heating coil and causes it to flow inside the hollow part. Occasionally, an accident such as the cooling liquid flowing out of the existing heating coil might flow out.

Further, when performing such heating, there is also a problem that the heating coil deteriorates due to the radiant heat of the heated work.

The present invention was devised in view of the above circumstances, and even if it contacts the work piece while being energized, no arc is generated, and therefore, the arc is damaged. It is an object of the present invention to provide a heating coil which is capable of preventing deterioration of the heating coil due to radiant heat of a heated work without causing any deterioration.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the heating coil according to claim 1 is arranged so as to oppose the surface to be heated of the workpiece and heats the surface to be heated. A surface opposite to the surface to be heated and a plurality of substantially U-shaped insulating ceramics which are adhered to both side surfaces adjacent to this surface and which prevent contact and also serve as a heat shield. .

Further, the heating coil according to claim 2 is arranged so as to face the inner peripheral surface of the workpiece and heats the inner peripheral surface. The outer peripheral surface facing the inner peripheral surface, and a plurality of substantially U-shaped insulating ceramics adhered to both side surfaces adjacent to the outer peripheral surface. It is provided with a contact prevention and heat shield piece provided with a projection protruding in a direction away from it, and a contact prevention and heat shield piece holding ring provided with an annular convex portion around the periphery, which is engaged with the projection.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 are drawings for explaining the present embodiment. FIG. 1 is a cross sectional view taken along the line AA of FIG. 2, FIG. 2 is a plan view, and FIG. 3 is a contact prevention and heat shield. FIG. 4 is a perspective view of the heat-shielding piece retaining ring for preventing contact and FIG. The heating coil of this embodiment also heats the inner peripheral surface of an annular work (not shown).

As shown in FIG. 1 and FIG. 2, the heating coil 30 of the present embodiment is arranged so as to face the inner peripheral surface of an annular work (not shown) and has a substantially cross-section for heating the inner peripheral surface of the work. The quadrangular and annular heating conductor 31 and a plurality (36 in this embodiment) of contact prevention / heat shield pieces 10 attached to the heating conductor 31 and the contact prevention / heat shield piece 10 are locked. It is equipped with a pair of contact prevention and heat shield retaining rings 20, 20. A pair of power supply conductors 36 and 37 coupled via an insulating plate 35 are connected to both ends of the cutting point of the heating conductor 31. The reference numeral 34 denotes a hollow portion of the heating conductor 31, which is a cooling liquid flow passage for the heating coil 30.

As shown in FIG. 3, the contact prevention and heat shield piece 10 made of an insulating ceramic is formed in a substantially U shape, and has a flat plate-shaped member 11 and members 11 at both ends orthogonal to the member 11. Thus, a pair of flat plate-shaped members 12 and 12 are provided so as to project, and a pair of projections 13 and 13 projecting from the members 12 and 12 in opposite directions to each other. The members 11, 12, 12 and the protrusions 13, 13 are integrally formed.

Each of the contact prevention and heat shield pieces 10 is attached so that the member 11 is adhered to the outer peripheral surface 32 of the heating coil 90 and the members 12 and 12 are adhered to the side surfaces 33 and 33 of the heating coil 30, respectively. There is. Further, as shown in FIG. 4, the contact prevention / heat shield piece retaining ring 20 has an annular convex portion 21 formed in the periphery thereof. Then, the convex portion 21 of the contact prevention / heat shield piece holding ring 20 is locked to the projection 13 on one side of all the contact prevention / heat shield piece holding rings 20, and the other contact prevention / heat shield piece holding ring 20. Both contact prevention and heat shield piece retaining rings 20, 20 are arranged so that the convex portion 21 of all of the contact prevention and heat shield pieces 10 is locked to the protrusions 13 on the other side of the heat shield piece 10.

When the inner peripheral surface of the annular work is heated by using the heating coil 30, the outer peripheral surface 32 of the heating coil 30 is disposed so as to face the inner peripheral surface of the work, and then the power supply conductor is provided. A high-frequency current is passed through the heating conductor 31 through 36 and 37 for a predetermined time.

At this time, since the outer peripheral surface 32 and the both side surfaces 33, 33 of the heating conductor 31 are covered with the insulating contact preventing / shielding piece 10, the heating conductor 31 does not directly contact the work. Even if the contact prevention / heat shield 10 comes into contact with the workpiece, the contact prevention / heat shield 10 is insulative, so no arc is generated, and therefore the conventional heating coil generated by the arc It does not cause any visible damage. Further, since each contact prevention / heat shield piece 10 is locked by the contact prevention / heat shield piece retaining ring 20, even if the adhesion strength of the contact prevention / heat shield piece 10 to the heating conductor 31 is weakened, It does not fall out.

Further, the radiant heat radiated by the heated work does not reach the heating conductor 31 by being blocked by the contact prevention / heat shield piece 10, so that the radiant heat does not deteriorate the heating coil 30.

[0016]

[Effect of device]

 As described above, the heating coil according to claim 1 has a surface facing the heated surface of the heating conductor arranged so as to face the heated surface of the workpiece, and both side surfaces adjacent to this surface. It is provided with a plurality of bonded substantially U-shaped contact preventing and heat shielding pieces made of insulating ceramic.

According to a second aspect of the present invention, there is provided a heating coil, wherein an outer peripheral surface of the heating conductor, which is disposed so as to face the inner peripheral surface of the work, faces the inner peripheral surface of the work, and both side surfaces adjacent to the outer peripheral surface. A contact prevention and heat shield piece having a plurality of substantially U-shaped insulating ceramics adhered to the surface and having projections protruding at opposite ends and away from each other; It is provided with a contact-prevention and heat-shielding piece holding ring, which is provided with a ring-shaped convex portion around which it is locked.

Therefore, in any of the heating coils according to claims 1 and 2, the heating conductor does not directly contact the work, and even if the contact prevention / heat shield piece contacts the work, Since the protection and heat shield is insulating, no arc is generated. Therefore, when the heating coil according to the first and second aspects is used, the damage due to the arc that has been observed when using the conventional heating coil does not occur. Further, the radiant heat emitted from the work heated by the heating conductor is blocked by the contact prevention and heat shield pieces, so that the deterioration of the heating conductor due to the radiant heat can be prevented.

Further, in the heating coil according to the second aspect, in addition to the above effect, even if the adhesive force of the contact prevention / heat shield piece is reduced, the contact prevention / heat shield piece is always the contact prevention / heat shield piece. Since it is locked by the retaining ring, there is an advantage that the contact prevention and heat shield pieces do not fall off.

[Brief description of drawings]

1 is a cross-sectional view taken along the line AA of FIG.

FIG. 2 is a plan view of an embodiment of the present invention.

FIG. 3 is a perspective view of a contact prevention and heat shield according to an embodiment of the present invention.

FIG. 4 is a perspective view of a contact-prevention and heat-shielding piece retaining ring according to an embodiment of the present invention.

FIG. 5 is a perspective view of a conventional heating coil.

[Explanation of symbols]

 10 Contact prevention and heat shield piece 13 Protrusion 20 Contact prevention and heat shield piece Retaining ring 21 Convex portion 30 Heating coil 31 Heating conductor 32 Outer peripheral surface 33 Side surface

Claims (2)

[Scope of utility model registration request] 1. A heating conductor having a substantially rectangular cross section, which is arranged so as to face a heated surface of a workpiece and heats the heated surface, and a surface of the heating conductor facing the heated surface, A plurality of substantially U-shaped insulative ceramic-made insulating ceramics bonded to both side surfaces adjacent to the surface. A high-frequency heating coil, which prevents contact with a surface to be heated and prevents radiant heat emitted from the surface to be heated and heated by the heating conductor from reaching the heating conductor. 2. A heating conductor which is disposed so as to face the inner peripheral surface of the work and which heats the inner peripheral surface and which has a substantially rectangular cross section and an annular shape, and an outer peripheral surface of the heating conductor which faces the inner peripheral surface. And a plurality of substantially U-shaped insulating ceramics adhered to both side surfaces adjacent to the outer peripheral surface, and both ends are provided with protrusions protruding in opposite directions and away from each other to prevent contact. A heat-shielding piece, and a contact-preventing and heat-shielding piece retaining ring provided with an annular convex portion that engages with the projection in the periphery, wherein the contact-preventing and heat-shielding piece has the heating conductor on the heated surface A high-frequency heating coil, which prevents contact and prevents radiant heat emitted from the heated surface heated by the heating conductor from reaching the heating conductor.