JPH08165517A - High frequency induction heating apparatus - Google Patents

Abstract

PURPOSE: To simply execute the adjustment in high accuracy, in a high frequency induction heating apparatus which can adjust the heating range of a work. CONSTITUTION: A movable coil 20 is combined with a fixed coil 10 for heating the work W. The movable coil 20 is moved in the axial length direction of the work W to adjust the heating range of the work W. A screw beam 31 for driving the movable coil 20 is arranged. At the time of operating the screw beam 31 with a handle 33, the movable coil 20 is shifted to the axial length direction of the work W.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device for heating the outer peripheral surface of a cylindrical work in order to quench the surface of the work. More specifically, it relates to the heating range in the axial direction of the work depending on the total length of the work. The present invention relates to a high-frequency heating device that can adjust

[0002]

2. Description of the Related Art As a high-frequency heating device for heating the outer peripheral surface of a cylindrical work in order to quench the surface of the work, there is one that can adjust the heating range in the axial direction according to the total length of the work. The basic configuration of this high-frequency heating device is shown in FIG.

This high frequency heating device comprises a fixed coil 10 for heating and a movable coil 20 for adjusting the heating range. The fixed coil 10 is a so-called semi-open type heating coil, and has a pair of heating conductors 11, 11 extending in the axial direction of the workpiece W. The heating conductors 11 and 11 are the work W.
Located on both sides of and facing the outer peripheral surface of the work W. One end of each of the heating conductors 11 and 11 crosses the work W and is approximately 1 /
4 arc conductors 12, 12 and L-shaped lead conductor 13,
It is connected to the power supply plates 15 and 15 via 13. The power supply plates 15 and 15 are insulated by an insulating plate 16 and connected to a high frequency power source (not shown). The other ends of the heating conductors 11, 11 are connected to each other by a connection conductor 14 having a substantially 1/2 arc shape.

The movable coil 20 comprises a pair of linear conductors 2 extending in the axial direction of the work W along the heating conductors 11, 11.
1 and 21. The straight conductors 21 and 21 are fixed coils 1
0 heating conductors 11, 11 are overlaid on the upper side. For insulation, an insulating sheet 24 made of Teflon is fixed to the upper surfaces of the heating conductors 11 and 11 by tape winding. One end of each of the linear conductors 21 and 21 (end on the side of the heating conductors 11 and 11) is a connecting conductor 22 having a substantially ½ arc extending over the work W.
Are connected to each other by. The other ends of the linear conductors 21 and 21 with respect to the center are connected to each other by a plate conductor 23 having a substantially 1/2 arc shape similar to the connection conductor 22. The plate conductor 23 is located inside the connection conductor 14 of the fixed coil 10. The movable coil 20 is entirely the work W.
Can be moved in the axial direction.

When heating the work W, the work W
A high-frequency current is supplied to the fixed coil 10 while rotating the. Then, an induced current is generated in the plate-shaped conductor 23 of the movable coil 20, and a high frequency current also flows in the movable coil 20. At this time, the current flowing through the heating conductors 11, 11 of the fixed coil 10 and the current flowing through the linear conductors 21, 21 of the movable coil 20 overlapping the heating conductors 11, 11 have opposite directions. Therefore, the heating conductors 11 and 11 and the linear conductor 2
In the superposed portions of 1 and 21, magnetic fluxes cancel each other out.
Therefore, the outer peripheral surface of the work W is heated by the portions of the heating conductors 11, 11 other than the overlapping portions with the linear conductors 21, 21. By moving the movable coil 20 in the axial direction of the workpiece W, the heating range in the axial direction of the workpiece W is adjusted according to the total length of the workpiece W and the like.

[0006]

In such a heating range adjusting type high frequency heating apparatus, the moving position of the movable coil 20 determines the heating range of the work W. Therefore, it is necessary to accurately determine the moving position of the movable coil 20. However, in the conventional apparatus, since the worker manually moves and positions the movable coil 20, the work takes time and the work efficiency is low. In addition, the movable coil 20
There was variation in the moving position of, and the accuracy was low.

The present invention was devised in view of the above circumstances, and the high-frequency heating apparatus has a simple structure in which the movement of the movable coil and the adjustment of the movement position can be performed efficiently and highly accurately by a simple operation. The purpose is to provide.

[0008]

A high-frequency heating apparatus according to the present invention has a pair of heating conductors extending in the axial direction of a cylindrical work and facing each other at two circumferential positions on the outer peripheral surface of the work with the work sandwiched therebetween. Then, one end of the heating conductor is connected by a connecting conductor that straddles the work, and the other end is connected to a high-frequency power source, and a fixed coil for heating, and the axial length of the work along the pair of heating conductors. Has a pair of linear conductors extending in the direction, the heating conductor side ends of the linear conductors are connected by a connecting conductor that straddles the workpiece, and the pair of linear conductors are connected by a plate-shaped conductor on the non-heating conductor side, Comprises a movable coil for heating range adjustment movably supported in the axial direction of the workpiece, and a drive mechanism provided on the side opposite to the heating conductor for driving the movable coil in the axial direction of the workpiece. , The drive mechanism is A shaft extending in the axial direction of the screw rod, the tip of which is rotatably connected to the end of the movable coil, and a nut member that is attached to a fixed base that supports the movable coil and rotatably supports the screw rod. And a handle attached to the other end for rotating the screw rod.

In the high-frequency heating device according to the second aspect, a scale is provided on the side of the movable coil or the side of the fixed base supporting the coil in order to grasp the moving position of the movable coil.

[0010]

When the screw rod is rotated, the movable coil moves in the axial direction of the work. By adjusting the operation amount of the screw rod,
The movable coil can be accurately guided to a desired position.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of a high frequency heating apparatus showing one embodiment of the present invention, and FIG. 2 is a perspective view partially showing a part of the apparatus.

As shown in FIG. 1, this high-frequency heating device is
A fixed coil 10 for heating the work W, a movable coil 20 for adjusting a heating range, and a drive mechanism 30 for driving the movable coil 20 are provided. The fixed coil 10 is fixed on the fixed base, and the movable coil 20 can move on the fixed base in the axial direction of the workpiece W.

In the present high frequency heating apparatus, the drive mechanism 3
0 is important. Fixed coil 10 and movable coil 20
Since the specific configuration of the above is substantially the same as that of the conventional device shown in FIG. 3, the same parts are denoted by the same reference numerals and the description thereof is omitted.

The drive mechanism 30 is provided on the other end side of the movable coil 20, that is, on the side not overlapping the fixed coil 10, and has a screw rod 31 extending in the axial direction of the workpiece W. The screw rod 31 penetrates a vertical plate-shaped support member 40 provided on the fixed base and is screwed with a nut member 32 fitted and fixed in the through hole. The tip end of the screw rod 31 is a vertical plate-shaped connecting member 25 attached to the other end of the movable coil 20.
Is rotatably connected to. A handle 33 for rotating the screw rod 31 is attached to the other end of the screw rod 31. Note that at least one of the screw rod 31, the nut member 32, and the support member 40 is made of an insulating material.

In the drive mechanism 30, when the handle 33 is rotated, the screw rod 31 moves in the axial direction. As a result, the movable coil 20 moves in the axial direction of the work W. Since the movable coil 20 is moved by the rotating operation of the handle 33, the moving operation is easy. Further, the moving position of the movable coil 20 can be determined with high accuracy.

In order to perform this positioning with higher accuracy,
In this embodiment, a scale 50 is used as shown in FIG. The scale 50 has scales aligned in the moving direction of the movable coil 20, that is, the axial direction of the work W, and is attached to a transparent fixed cover 70 that covers the fixed coil 10 and the movable coil 20 here. On the other hand, the movable coil 20
A pointer 51 that moves along with the movable coil 20 along the scale 50 is attached to the tip of the. The pointer 51 is made of a non-conductive material. Pointer 5 by scale 50
By grasping the position of 1, the position of the tip of the movable coil 20 can be known, and the positioning can be performed with higher accuracy. Although the scale 50 is provided on the fixed side in FIG. 2, it may be provided on the movable coil 20 side.

[0017]

As described above, in the high frequency heating apparatus according to the present invention, the movable coil is moved by the rotating operation of the handle, so that the movement can be performed easily.
Moreover, the moving position can be adjusted with high accuracy. Also, despite moving the moving coil mechanically,
Its drive mechanism is simple.

In the high-frequency heating apparatus according to the second aspect, the scale is provided on the side of the movable coil or the fixed base supporting the coil in order to grasp the moving position of the movable coil. It can be performed with higher accuracy.

[Brief description of drawings]

FIG. 1 is a side view of a high-frequency heating device showing an embodiment of the present invention.

FIG. 2 is a perspective view partially showing a part of the heating device.

FIG. 3 is a perspective view showing a basic configuration of a heating range adjusting type high frequency heating device.

[Explanation of symbols]

 10 Fixed Coil 11 Heating Conductor 14 Connection Conductor 20 Moving Coil 21 Straight Conductor 22 Connection Conductor 23 Plate Conductor 30 Drive Mechanism 31 Screw Rod 32 Nut Member 33 Handle

Claims (2)

[Claims] 1. A pair of heating conductors which extend in the axial direction of a cylindrical work and are opposed to each other at two circumferential positions on the outer peripheral surface of the work with the work sandwiched therebetween, and one end of the heating conductors are opposite to each other. A fixed coil for heating, which is connected by a connecting conductor across the other end and is connected to the high-frequency power source at the other end, and a pair of linear conductors extending in the axial direction of the workpiece along the pair of heating conductors. The end portion of the conductor on the heating conductor side is connected by a connecting conductor that straddles the workpiece, and a pair of linear conductors are connected by a plate-shaped conductor on the non-heating conductor side, and the whole is supported so as to be movable in the axial direction of the workpiece. It is equipped with a moving coil for adjusting the heating range and a drive mechanism provided on the side opposite to the heating conductor for driving the moving coil in the axial direction of the workpiece. The end of the moving coil A rotatably connected screw rod, a nut member that is attached to a fixed base that supports the movable coil and rotatably supports the screw rod, and a handle that is attached to the other end for rotating the screw rod. A high-frequency heating device comprising: 2. A scale is provided on the side of the movable coil or on the side of a fixed base supporting the coil in order to grasp the moving position of the movable coil.
The high frequency heating device according to.