JPH04187712A - Method and apparatus for high frequency electrification induction hardening - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a high frequency current induction hardening apparatus and method for heating the recessed surface of a workpiece.

<Conventional technology> The conventional technology will be explained below with reference to the drawings.

FIG. 5 is an explanatory diagram of a first example of a conventional induction hardening device for hardening the recessed surface of a workpiece, and FIG. 6 is an explanatory diagram of a second example of a conventional induction heating device for heating the recessed surface. It is an explanatory diagram of an example.

As shown in FIG. 5, a substantially saddle-shaped recess 2 is formed in one surface 1a of a rectangular parallelepiped workpiece 1 having a width t.

The recess 2 consists of a bottom surface 2a and opposing sides 2b, 2c on either side of this bottom surface 2a.

A high frequency heating coil 3 is used to heat the bottom surface 2a and side surfaces 2b and 2c.

Move the high-frequency heating coil 3 in the direction of arrow P, place the lower part of the high-frequency heating coil 3 close to the recess 2 of the workpiece 1, and after applying high-frequency current to the high-frequency heating coil 3 for a predetermined time, cool it from a jacket (not shown). The liquid is injected onto the bottom surface 2a and side surfaces 2b and 2c of the recess 2 to harden the surface of the recess 2.

Further, as shown in FIG. 6, the workpiece 5 has stepped recesses 6 and 7 formed at its end. A high-frequency heating coil 8 is used to heat the bottom surface 6a and side surface 6b of the recess 6.

The high-frequency heating coil 8 is moved in the direction of the arrow Q, the lower part of the high-frequency heating coil 8 is disposed close to the bottom surface 6a and the side surface 6b of the recess 6, and a high-frequency current is applied to the high-frequency heating coil 8 for a predetermined period of time (not shown). A cooling liquid is injected from the jacket onto the bottom surface 6a and side surface 6b of the recess 6 to harden the surface of the step 6.

<Problems to be Solved by the Invention> However, when heating the surfaces of the recess 2 and the recess 6 using the high-frequency heating coils 3 and 8, the following problems occur.

That is, for example, in the first conventional example, when the bottom surface 2a of the recess 2 is heated by the high-frequency heating coil 3, as shown in FIG. The parts 2d and 2e near both ends of are mainly heated. If the width dimension t of the workpiece 1 is more than a certain level, the heat of the parts 2d and 2e will hardly reach the central part 2f of the workpiece 1 in the width direction, and this central part 2f will not be sufficiently heated. A predetermined hardened layer is not formed in the central portion 2f. Similarly, the predetermined hardened layer is not formed in the center portions of the side surfaces 2b and 2C of the recess 2.

Such a problem also occurs in the heating of the surface of the recess 6 described in the second conventional example.

The present invention was devised in view of the above circumstances, and an object of the present invention is to provide a high-frequency current induction hardening apparatus and method that can uniformly heat the surface of a recess in a workpiece.

Means for Solving the Problems> In order to solve the above problems, the high frequency current induction hardening apparatus of the present invention hardens the recessed surface of a workpiece. A first conductor is connected to the surface of the workpiece near one end of the recess through a conductor, and the other end is connected to one end of the high frequency power source, and the first conductor is connected to the other end of the high frequency power source through an insulator. a second conductor coupled to the first conductor, the other end being connected to the surface of the workpiece near the other end of the recess via a second contact, and the width of the second conductor is equal to the width of the recess. The width of the second conductor is approximately equal to the width of the recess, and the shape of the second conductor is formed to protrude so as to correspond to the shape of the recess.

In addition, in order to solve the above problem, the high frequency current induction hardening method of the present invention includes a first conductor provided at one end of the first conductor in a high frequency current induction hardening method for hardening the recessed surface of the workpiece.
The contactor is brought into contact with the surface of the workpiece near one end of the recess, and the conductor between both ends is formed to protrude to correspond to the width and shape of the recess, and one end is connected to the first conductor through an insulator. After the second contact provided at the other end of the coupled second conductor is brought into contact with the surface of the workpiece near the other end of the recess, a high frequency power source is applied between the other end of the first conductor and one end of the second conductor. A high-frequency current is applied to the recess surface and the second conductor between the first contact and the second contact, and a high-frequency current is induced on the recess surface by the current flowing through the recess surface and the high-frequency current flowing through the second conductor. The induced current heats the recess surface.

<Function> On the surface of the recess between the first contact and the second contact, the high frequency current supplied from the high frequency power source and the induced current induced by the high frequency current flowing through the second conductor are applied to the surface of the recess. Flows uniformly in all parts of the body.

Therefore, a uniform hardened layer is formed on any portion of the surface of the recess.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings. 1 to 3 are drawings for explaining a high frequency induction hardening apparatus according to a first embodiment of the present invention, in which FIG. 1 is a perspective view and FIG. FIG. 3 is a sectional view taken along the line B--B in FIG. 1. FIG. 4 is a diagram corresponding to FIG. 3 of a high-frequency current induction hardening apparatus according to a second embodiment of the present invention. Note that the same reference numerals are given to the same parts as those described in the related art section.

First, a first example will be described.

In this embodiment, the workpiece 1 described in FIG. 5 is used as the workpiece, and the hardened portion thereof is also the surface of the substantially saddle-shaped recess 2 as described in FIG. 5. That is, work 1
is a rectangular parallelepiped with a width t, and one surface 1 of the workpiece 1
The bottom surface 2a and the surfaces of the side surfaces 2b and 2C of the substantially saddle-shaped recess 2 formed in the section a are hardened.

As shown in FIGS. 1 and 2, the high frequency induction hardening apparatus of this embodiment includes a first conductor 10 and a second conductor 20. The first conductor 10 has one end connected to the surface 1a of the work 1 near one end of the recess 2 via the first contact 11, and the other end connected to one end of the high frequency power source 100.

The second conductor 20 has a bent shape, with the bottom surface 2a and side surfaces 2b, 2C of the recess 2 between both ends.
is formed protrudingly to correspond to the shape of the plate-shaped insulator 3, one end of which is connected to the other end of the high-frequency power source 100.
0 to the first conductor 10, and the other end is connected to the surface 1a of the work 1 near the other end of the recess 2 via the second contact 24.

Further, the second conductor 20 includes a bottom surface 2a, a side surface 2b, and a bottom surface 2a of the recess 2.
2c, and integrally formed conductors 21, 22, and 23 are provided so as to face each other. The widths of the conductors 21, 22, and 23 of the first conductor 10 and the second conductor 20 are approximately the same as the width t of the recess 2. Further, the dimensions of the conductors 21, 22, and 23 are as follows when the high-frequency induction hardening apparatus is installed in the recess 2 of the work l.
22.23 and the bottom surface 2a, side surface 2b, 2 of the recess 2, respectively.
c is set to be a predetermined distance.

As shown in FIGS. 2 and 3, the first conductor 10 and the second conductor 20 have hollow portions 12 and 25, respectively. This serves as a passageway for the cooling fluid.

A plurality of coolant injection holes 26 that are electrically connected to the hollow portion 25 are formed on the surfaces of the conductors 21, 22, and 23 of the second conductor 20 that are opposite to the bottom surface 2a, side surfaces 2b, and 2C of the recess 2, respectively. There is. A coolant supply pipe and a coolant discharge pipe (not shown) are connected to the first conductor 10 so as to communicate with the hollow portion 12 thereof, and the second conductor 20 is connected to the hollow portion 25 thereof.
A cooling liquid supply pipe (not shown) for supplying cooling liquid is connected to the cooling liquid supply pipe.

Next, a method for hardening the surface of the recess 2 of the workpiece 1 using the high frequency induction hardening apparatus of this embodiment will be explained.

The first conductor 10 of the above-mentioned high frequency induction hardening apparatus
The contactor 10 is brought into contact with the surface 1a of the workpiece 1 near one end of the recess 2, and the first conductor 10 is connected to the surface 1a. At the same time, the second contactor 20 of the second conductor 20 is brought into contact with the surface 1a of the workpiece 1 near the other end of the recess 2, and the second conductor 20 is brought into contact with the surface 1a of the workpiece 1 near the other end of the recess 2.
Connect to a.

Next, a high frequency current is applied from the high frequency power source 100 to the high frequency induction hardening apparatus for a predetermined period of time. The high frequency current is transmitted from the high frequency power supply 100 to the first conductor 10, the first contact 10, the side surface 2b of the recess 2, the bottom surface 2a, the side surface 2C1, the second contact 20,
It passes through conductors 23 , 21 and 22 of the second conductor 20 and returns to the high frequency power supply 100 .

At this time, the bottom surface 2a, side surfaces 2b, 2c of the recess 2 are not only heated by the high-frequency current passing through these surfaces and their vicinity, but also the bottom surface 2a, side surfaces 2b, 2c are heated by the second conductor 20, respectively. Heating is also caused by induced currents induced by high frequency currents flowing in the conductors 21, 22, 23. Then, as described above, the first conductor 10 and the second conductor 20
The width of each conductor 21, 22, 23 is equal to the width t of the recess 2.
Since the dimensions of the recess 2 are approximately the same, both the energizing current and the induced current flowing through the bottom surface 2a, side surfaces 2b, and 2c of the recess 2 are uniform in the width direction of the recess 2, so which part of the surface of the recess 2 But it heats up evenly.

After heating the bottom surface 2a, side surfaces 2b and 2c of the recess 2, the second
The cooling liquid supplied into the hollow portion 25 of the conductor 20 is
After the conductor 20 is cooled, the coolant is jetted from the cooling liquid injection hole 26 of the conductor 21, 22, 23, and is sprayed onto the bottom surface 2a and side surface 2b of the recess 2.
, 2c is cooled and quenched. Bottom surface 2a and side surface 2b of recess 2
, 2c was uniformly heated, so that the cured layers formed on these surfaces were also uniform.

The second embodiment, as shown in FIG. 4, is a high-frequency induction hardening apparatus for hardening the surface of a stepped recess 6 of a workpiece 5 shown in FIG.

The high frequency induction hardening device of this embodiment has a similar structure to the first high frequency current induction hardening device, and has a hollow portion 12.
a, a second conductor 20a having a hollow portion 25a, an insulator 30a that insulates the first conductor 10a and the second conductor 20a, the - side is connected to the first conductor 10a, and the other side is connected to the workpiece 5. The first contactor 11 connected to the tip surface 5a
a and a second contact 24 a whose one side is connected to the end of the second conductor 20 a on the side opposite to the high-frequency power source 100 and whose other side is connected to the bottom surface 7 a of the recess 7 above the recess 6 .

The second conductor 20a has a substantially hook-shaped bent shape, and conductors 21a and 23a are integrally formed to correspond to the shapes of the bottom surface 6a and side surface 6b of the recess 6, respectively.
It is equipped with Note that the second conductor 20a is provided with a coolant injection hole 26a.

<Effects of the Invention> As explained above, the high-frequency current induction hardening apparatus and method of the present invention provide a high-frequency current induction hardening method for hardening the recessed surface of a workpiece. One contact is brought into contact with the surface of the workpiece near one end of the recess, and the conductor between both ends is formed to protrude to correspond to the width and shape of the recess, and one end is connected to the first conductor through an insulator. After the second contact provided at the other end of the second conductor coupled to the recess is brought into contact with the surface of the workpiece near the other end of the recess, a high frequency A power source is connected and a high frequency current is applied to the recess surface and the second conductor between the first contact and the second contact, and the recess is caused by the current flowing to the recess surface and the high frequency current flowing to the second conductor. The recess surface is heated by the induced current induced in the surface.

Therefore, when the recessed surface of a workpiece is hardened using the high-frequency current induction hardening apparatus and method of the present invention, each portion of the recessed surface is uniformly heated to form a uniform hardened layer.

[Brief explanation of drawings]

1 to 3 are drawings for explaining a high frequency induction hardening apparatus according to a first embodiment of the present invention, in which FIG. 1 is a perspective view and FIG. FIG. 3 is a sectional view taken along the line B--B in FIG. 1. FIG. 4 is a drawing corresponding to FIG. 2 of a high-frequency current induction hardening apparatus according to a second embodiment of the present invention. FIG. 5 is an explanatory diagram of a first example of a conventional induction hardening device for phosphorizing the surface of a recess, and FIG.
FIG. 2 is an explanatory diagram of a second example of a conventional induction hardening device for heating the surface of a recess. 1.5...Work, 1a...Surface, 2.6...
- Recess, 2a, 6a - bottom, 2b, 2C16cm - side, 10.10a... first conductor, 11.11a...
First contact, 20.20a...Second conductor, 24.2
4a...Second contact, 30.30a...Insulator. Patent Applicant Fuji Electronics Industry Co., Ltd. Agent Patent Attorney Takaharu Ohnishi Figure 6

Claims (2)

[Claims] (1) In a high-frequency current induction hardening device that hardens the recessed surface of a workpiece, one end is connected to the surface of the workpiece near one end of the recessed area via the first contact, and the other end is connected to one end of a high-frequency power source. a connected first conductor; one end is connected to the other end of the high frequency power source and coupled to the first conductor via an insulator, and the other end is connected to the other end of the recess via a second contact; the second connected to the surface of the workpiece
a conductor, the width of the second conductor is approximately equal to the width of the recess, and the shape of the second conductor is formed to protrude to correspond to the shape of the recess. Induction hardening equipment. (2) In a high frequency current induction hardening method for hardening the surface of a recess of a workpiece, a first contact provided at one end of the first conductor is brought into contact with the surface of the workpiece near one end of the recess, and both ends A second contact provided at the other end of the second conductor, the conductor between which is formed protrudingly to correspond to the width and shape of the recess, and whose one end is connected to the first conductor via an insulator, is connected to the recess. After contacting the surface of the workpiece near the other end, a high frequency power source is connected between the other end of the first conductor and one end of the second conductor to apply a high frequency current to the recess between the first contact and the second contact. A high frequency energization induction characterized in that the surface and the second conductor are energized, and the recess surface is heated by the current flowing through the recess surface and the induced current induced on the recess surface by the high frequency current flowing through the second conductor. Quenching method.