JPS6144394Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an induction hardening coil body that can simultaneously harden at least two or more desired hardening points of an object to be hardened, which has a plurality of hardening points.

FIG. 1 shows a perspective view of a circular pressure plate, which is a clutch part for an automobile, as an example of the object to be hardened. Furthermore, the surface of the pressure plate 11 has concave areas evenly spaced concentrically with the circumferential circle. The six hardening target locations 12 provided are illustrated. FIG. 2 is a longitudinal cross-section of the area 12 to be hardened, showing a state in which the heating unit 13 for hardening the egg-shaped recessed portion using high frequency waves is inserted at a distance of about 1 mm from the inner wall of the area to be hardened. .

Conventionally, induction hardening was performed by repeating the operation of inserting a heating section several times at one or two of the plurality of locations to be hardened, as shown in FIG. 2. Therefore, the workability is poor and inefficient, and it is difficult to uniformize the quality of hardening of the object to be hardened. In addition, in manufacturing a heating coil of the present invention in which all parts are hardened at the same time, a coil in which copper pipes are connected in series in a ring shape is considered, but in a coil body with such a structure, brazing of the copper pipes Because each part is connected, the machining accuracy is insufficient and the relative positional relationship with the workpiece varies at each part to be hardened. Not only can a uniform hardening effect not be expected for each part, but the cooling water flowing through the coil is not uniform. Since it is only a system, if a large current is applied to the heating coil, there is a risk that the cooling water will evaporate due to insufficient cooling and the cooling effect will be lost.

The present invention has been developed in view of these points, and when there are multiple partially quenched areas like the pressure plate mentioned above, it is possible to align the pressure plate and the heating section in one operation. In order to enable simultaneous hardening of all of the above-mentioned hardening points, an induction hardened coil body is provided which has at least two heating parts and further has a cooling water passage divided into at least two or more equal parts. The purpose is to

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 shows a perspective view of the heating coil main body portion of the induction hardened coil body according to the present invention. The six heating parts 101 are made of hollow copper pipes, and are formed in a shape that follows the inside shape of the recess to be hardened, and both ends thereof are attached to rectangular heating part mounting plates 102 for attachment to the conductive parts for connection. They are brazed to each other, and are screwed to the lower end of each of the two adjacent connecting conductive parts 201, 202, 203 by means of this heating part mounting plate, so that they straddle each other.

The heating coil main body has a circular ring divided into six equal parts in the radial direction, and five of the six fan-shaped blocks divided into six fan-shaped blocks with a gap 301 between them are used as connecting conductive parts 201 to generate high-frequency waves. The remaining one, which is the current introduction part, is similarly divided into two in the radial direction, and the fan-shaped blocks divided so as to have a gap 302 narrower than the gap 301 are used as the connecting conductive parts 202 and 203. Then, the arc circumference of the sector is formed by six gaps 301 and one gap 302.
They are arranged in a perfect circle with each of them narrowly spaced apart.

Moreover, the above-mentioned connecting conductive parts 201, 202, 203
Each has a hole communicating with the hollow part of the attached heating part 101 and a groove bored to connect these holes, thereby forming a cooling water passage.

Further, on the upper surface of the sector-shaped block which is the electrically conductive part for connection, electrically conductive part covers 401, 402, 403, and 404 for connection, which are fan-shaped copper plates of the same shape, are screwed to maintain watertightness, respectively. Water supply and distribution hose connection tubes are brazed to two of the conductive part covers to form a conductive part cover 402 for connection. As shown in the figure, connecting pipes 412 are brazed to adjacent ends of the connecting conductive part covers 403 and 404, respectively, to form a cooling water passage and a high frequency current passage. Two bolts 421 are brazed to each of the conductive part covers 401 and 402 for connection, and one bolt 421 is brazed to each of 402 and 404, and the heating coil body is fixed to the coil body fixing plate 601, and the heating coil body is fixed to the coil body fixing plate 601. Form a coil body.

The other ends of the connection pipes 412 are brazed to the connection blocks 501, respectively, and the terminal plates 503
The terminal mounting plate 502 to which the water supply and drainage hose connection pipe 413 is brazed is attached to the connection block 50.
1 is screwed on. These are connected to the coil body fixing plate 6 by means of the block mounting L-shaped metal fittings 504.
Fixed to 01.

FIG. 4 is a partial sectional view of the heating part and the connecting conductive part, showing the hollow part of the heating part 101 and the connecting conductive part 20.
1 shows the connection status of the internal cooling water passages. In this case, the connection between the heating part 101 and the connecting conductive part 201 is kept watertight by narrowing the O-ring 103. Further, this figure shows a state in which adjacent conductive parts 201 for connection are fixed to the coil body fixing plate 601 made of an insulating material such as Bakelite with a required gap 301 interposed therebetween.

FIG. 5 shows a cross section when fully assembled. 70 in this figure
1,702 is a block for positioning the object to be hardened and the coil body, and the heating part is electrically insulated from the heating coil body receiving jig 801 by the fixed platen 601 made of the insulating material. There is.

Therefore, by using the coil body of the present invention, it is possible to simultaneously harden all desired parts of a part that has at least two parts to be hardened by one positioning operation between the part and the coil body. becomes.

As described above, the present invention enables simultaneous hardening of all the desired hardening parts in one operation by preparing a number of heating parts corresponding to the plurality of parts requiring hardening. By dividing the path into at least two systems and supplying and draining water separately for each system, it is possible to increase the high-frequency current flowing through the heating coil by preventing excessive temperature rise in the heating section and increasing the cooling effect. Since the heating time can be shortened and the heating section can be replaced, it is possible to respond to changes in the design of the part to be hardened, as well as to improve work efficiency and make quality uniform.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a pressure plate as an example of a part to be quenched, Fig. 2 is a partial sectional view of the pressure plate with a heating section inserted into the recess to be quenched, and Fig. 3 is a partial sectional view of the pressure plate as an example of a part to be quenched. An assembled perspective view of the main parts of the heating coil body according to the present invention, FIG. 4 is a partial cross-sectional view of the heating section attached to the support, and FIG. 5 is a heating coil with the heating coil body attached to the coil body fixing plate. FIG. 3 is a cross-sectional view of the body set on the work platform. DESCRIPTION OF SYMBOLS 11... Pressure plate, 12... Recessed part to be hardened, 13, 101... Heating part, 102...
... Heating part mounting plate, 201, 202, 203 ... Conductive part for connection, 301, 302 ... Coil support arrangement gap, 401, 402, 403, 404 ... Conductive part cover for connection, 411, 413 ... Water supply and drainage Hose connection pipe, 412...Connection pipe, 421
... Heating coil body mounting bolt, 501 ... Connection block, 502 ... Terminal mounting plate, 503 ... Terminal plate, 504 ... Block mounting L-shaped metal fitting, 601
...Coil body fixing plate, 103...O ring, 7
01,701...Positioning block, 801...
Heating coil body receiving jig.

Claims (1)

[Scope of utility model registration request] In an induction hardened coil body that simultaneously hardens the surface of a pressure plate and similar recesses at multiple locations, the coil body is arranged so as to correspond to at least two or more recesses on the circumference of the object to be hardened. The same number of heating parts as the parts to be quenched are connected and fixed in series with the heating coil main body formed by attaching the heating parts to the connecting conductive parts, and the arrangement of each heating part and the heating coil main body are fixed. It is a hardened coil main body that maintains insulation properties and is provided with a coil main body fixing plate having a positioning block, and a heating section is installed between the adjacent connecting conductive sections, and these heating sections are connected in series so that a high-frequency current flows through them, while forming independent cooling systems divided into at least two or more equal parts so that cooling water flows through them. Induction hardened coil body.