JPH0238910Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a high-frequency induction heating device for heating workpieces such as screws and gears for heat treatment such as hardening.

Prior Art FIG. 3 shows a conventional example of such a high-frequency induction heating device, in which a plurality of workpieces 220 placed at a predetermined pitch on a rotatable workpiece table 200 are heated by a workpiece coil 130. The basic structure is that quenching is performed by

That is, when the workpiece 220 to be heated is stopped below the workcoil installation position, a lifting means (not shown) raises the workpiece 220 to the position of the workpiece coil 130, and the workpiece 220 is heated in this state. It's summery. Then, when the heating is finished, the workpiece 220 is lowered, and the next workpiece 220 is
The heated workpiece 220 is cooled, that is, hardened, until it is stopped below the workpiece coil 130.

In the figure, reference numeral 170 denotes a high frequency oscillator, which supplies high frequency power at a predetermined frequency to the work coil 130 via a CT (output transformer) 50. Reference numerals 51 and 131 denote a separately provided CT and a work coil, respectively, and the work 22 placed on the work table 201 provided on the side of the work table 200
It is designed to harden a workpiece 221 that is different from the workpiece 221.
It is designed to be connected to a high frequency oscillator 170 by.

Note that in the following explanation, the CT and work coil are collectively referred to as CT.

Problems to be solved by the invention However, in the case of the above-mentioned conventional device,
When hardening different types of workpieces, two or more CTs and switching devices are required, resulting in large-scale equipment and a significant drop in work efficiency.

The present invention was made to solve the problems of the conventional technology, and is a high-frequency induction heating system that can heat different types of workpieces with one CT, thereby simplifying equipment and improving work efficiency. The purpose is to provide equipment.

Means for Solving the Problems The high-frequency induction heating device according to the present invention includes: an inner cylinder that houses a primary coil and is fixedly arranged; a high-frequency oscillator that supplies high-frequency power to the primary coil; The coil is fitted around the outer cylinder concentrically and is rotatably arranged, and has an outer cylinder forming a secondary coil and a work coil extending outward from the outer cylinder. Become.

Function In such a case, when the outer cylinder is rotated, the work coil will rotate accordingly.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.
FIG. 1 is a partially cutaway side view of a high-frequency induction heating device according to the present invention, and FIG. 2 is a plan view thereof.

A hollow disc-shaped fixing base 1 is fixedly arranged at a predetermined position on a base (not shown). A substantially lower half of a guide ring 2 having a circular cross section is buried in the upper surface of the fixing base 1 so that its center coincides with the upper surface of the fixed base 1. The guide ring 2 is made of ceramics.

A gear 3 made of an insulating material is rotatably provided on the fixed base 1. The rotation of the gear 3 is guided by a guide ring 2. That is, gear 3
An annular groove 3a is provided in a portion corresponding to the guide ring 2 on the lower surface side thereof, which fits approximately in the upper half of the guide ring 2.

An electric motor 4 for rotationally driving the gear 3 is provided on the right side of the gear 3. That is, a pinion 5 that meshes with the gear 3 is attached to the tip of the output shaft 4a of the electric motor 4, so that the gear 3 rotates when the electric motor 4 is driven. Drive control of the electric motor 4 is performed by a motor drive control circuit 40. The output shaft 4a has its rotation speed or rotation angle,
That is, a rotary encoder 6 is attached to detect the rotation speed or rotation angle of the gear 3. The detection result of the rotary encoder 6 is the motor drive control circuit 4.
0, and the motor drive control circuit 40 is configured to stop the gear 3 at a predetermined position based on this detection result.

A cylindrical outer cylinder 10 forming a secondary coil is attached to the upper surface of the gear 3. Specifically, the flange 11 provided at the lower end of the outer cylinder 10 is
2, 12... are used to attach it to the gear 3. A work coil 13 is extendable from the upper part of the outer cylinder 10 to the right side so as to be replaceable. The work coil 13 is formed by forming a copper tube into a loop shape, and the opposite end of the work coil 13 located on the proximal end side is connected to a joint portion 10a provided on the outer surface side of the outer cylinder 10. The tip side of the work coil 13 forms a circular heating section 13a. Note that the shape of this heating section 13a is selected depending on the shape of a workpiece 22 to be heated, which will be described later. Water is supplied into the work coil 13 to cool it. Cooling water is supplied via a hose not shown.

As shown in FIG. 2, the work coil connection portion of the outer cylinder 10 is edged over the entire height with a slight gap in the circumferential direction, and this edged portion is filled with an insulating material 10a such as Teflon. It has been done. In this way, the outer cylinder 10 is insulated at the cut edge, so that the high frequency waves induced in the outer cylinder 10 are passed through the work coil 13 to heat the work 22, as will be described later. It's summery.

In the outer cylinder 10, an inner cylinder 14 containing a primary coil 15 is housed concentrically and loosely fitted.
The inner cylinder 14 is made of an insulator, and its lower end is fixed on the fixed base 1. The primary coil 15 is connected to a high frequency oscillator 17 via a lead wire 16 that passes through the fixed base 1 downward. Thus, when high frequency waves of a predetermined frequency are supplied from the high frequency oscillator 17 to the primary coil 15, the high frequency waves on the secondary side induced by the induction effect flow through the outer cylinder 10 to the work coil 13. In other words, the primary coil 15
A CT is composed of the outer cylinder 10 and the outer cylinder 10.

On the right side of the work coil 13, a circular work table 20, for example, is provided rotatably around a vertical axis. This rotation is performed by a driving means 27 such as an electric motor or a hydraulic motor. Eight works 22 (eg, gears) are placed on the upper surface of the work table 20 at equal intervals in the circumferential direction. That is, a hole 28 for holding a workpiece is formed in a corresponding portion of the workpiece table 20, and a workpiece 22 is placed in a holding jig 24 having a bottomed cylindrical shape and housed in the hole 28. The inner surface shape of the holding jig 24 corresponds to at least the outer shape of the lower end of the workpiece 22, so that the workpiece 22 can be held securely. Note that the workpiece 22 is fed into the holding jig 24 automatically by an operator's manual operation or a robot hand.

A rod 26 of an air cylinder 25 (only one is shown in the drawing) attached to the work table 20 is connected to the center of the lower end surface of each holding jig 24, 24..., and when the air cylinder 25 is driven, the workpiece is 22 is designed to move up and down. Rod 26
The stroke is set to a value that allows the work 22 to be inserted into the work coil 13, and the work 22 is heated by the work coil 13 in this inserted state.

Note that an air cylinder 25 may be provided below the stop position of the work 22 to raise and lower the work 22, or the work coil 13 may be moved up and down.

In this way, the work table 20 is sequentially rotated by the driving means 27 so that each work 22, 22... is stopped below the work coil 13, and the air cylinder 25 is sequentially driven to sequentially drive the work 22, 22...
When raised, the work coil 13 heats each work 22, 22, . . . by electromagnetic induction. The heated workpiece 22 is cooled by cooling water supplied from a cooling means (not shown), and the workpiece 22 on the workpiece table 20 is thus hardened.

On the rear side of the work table 20 is a work table 2 on which a plurality of works 23 having different shapes from the work 22 are placed.
1 is provided. This work table 21 is also rotatable like the work table 20, and drives the electric motor 4 to rotate the outer cylinder 10, that is, the work coil 13 extended thereto in the direction shown by the white arrow in the figure. The workpiece 23 can be hardened by positioning the workpiece 21 at the position of the workpiece table 21, and then rotating the workpiece table 21 in accordance with the above-described procedure.

Here, from the quenching work of work 22 to the work 23
The transition to the hardening operation is performed after the required number of workpieces 22 have been hardened.

In the above embodiment, the case where the workpiece is hardened has been described, but it goes without saying that the present apparatus can also be applied to various heat treatments such as annealing, brazing, and soldering.

Further, in the above embodiment, the outer cylinder is rotated by a gear mechanism, but the outer cylinder may be rotated by a chain sprocket mechanism instead of the gear mechanism.

Furthermore, an embodiment may be adopted in which the outer cylinder is manually rotated without providing a gear mechanism or a chain/sprocket mechanism.

Effects of the invention In the case of the above-described device, the outer cylinder and the work coil extended thereto are rotatable, so by rotating the work coil, multiple types of workpieces placed at different positions can be heated. can be easily performed with a single CT. Therefore, compared to the above-mentioned conventional apparatus, the equipment can be simplified and the work efficiency can be greatly improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view of a high-frequency induction heating device according to the present invention, and FIG. 2 is a plan view thereof. FIG. 3 is a schematic plan view showing a conventional example. 1...Fixed stand, 3...Gear, 4...Electric motor, 1
0... Outer cylinder, 13... Work coil, 14... Inner cylinder, 17... High frequency oscillator, 20... Work table,
22...Workpiece, 24...Holding jig, 25...Air cylinder.

Claims (1)

[Scope of utility model registration request] A high-frequency induction heating device that heats one or more workpieces placed on a workpiece table includes: an inner cylinder that has a built-in primary coil and is fixedly arranged; a high-frequency oscillator that supplies high-frequency power to the primary coil; , an outer cylinder that is fitted around the inner cylinder concentrically and is rotatably arranged to form a secondary coil; and a work coil that extends outward from the outer cylinder. A high frequency induction heating device comprising: