JP3300293B2 - High frequency heating coil - Google Patents

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 coil for heating a side face of a groove formed on an inner surface of a cylindrical workpiece.

[0002]

2. Description of the Related Art As a cylindrical work in which a groove is formed on the inner surface, and it is necessary to heat the opposite side of the groove, for example, a tripod used for a constant velocity joint as shown in FIG. There is a cup part WC. The tripod cup portion WC as this cylindrical work is formed in a bottomed cylindrical shape, and has three grooves W at 120 ° intervals on the inner surface.
A is formed. Since the shaft constituting the constant velocity joint fits into the groove WA, it is necessary to perform induction hardening. For the heating during the induction hardening, for example, an induction heating coil 7000 as shown in FIG. 7 is used.

The high-frequency heating coil 7000 includes three substantially gate-shaped heating sections 710A, 710B, and 710C, two connection sections 720A and 720B for connecting the heating sections 710A, 710B, and 710C, and a high-frequency power supply (not shown). )
And power supply units 730A and 730B for connection to the power supply.

The heating units 710A, 710B, 710C
Are heating conductors 711A and 711 that match the shape of the groove WA.
11B and 711C. Such a heating conductor 71
High frequency heating coil 7 having 1A, 711B, 711C
000 are the heating conductors 711A, 711B, 711
The groove WA is heated by supplying a high-frequency current to the high-frequency heating coil 7000 while relatively moving the tripod cup WC and the high-frequency heating coil 7000 in a state in which C is placed inside the groove WA.

[0005]

However, the groove portion WA of the tripod cup portion WC is formed on the opposite side portion WM.
There is a type in which only the side portion WM is subjected to induction hardening among the bottom portion WB located between the side portions WM. In the above-described high-frequency heating coil 7000, not only the side surface portion WM but also the bottom surface portion WB are heated, so that the unnecessary bottom surface portion WB is subjected to induction hardening.

The present invention has been made in view of the above circumstances, and has as its object to provide a high-frequency heating coil capable of heating only a side surface of a groove.

[0007]

A high-frequency heating coil according to the present invention is a high-frequency heating coil for heating a side face of a groove formed on an inner surface of a cylindrical workpiece, the side face facing the side face. Heating conductor portion, a pair of power supply conductor portions connected to the high-frequency power supply, a first connection conductor portion connecting between one power supply conductor portion and one heating conductor portion, and the one heating conductor portion And a second connection conductor connecting between the first and second heating conductors. The first and second connection conductors have a parallel portion for dividing a high-frequency current into two.

[0008]

FIG. 1 is a schematic configuration diagram of a high-frequency heating coil according to an embodiment of the present invention, FIG. 2 is a schematic perspective view of a main part of the high-frequency heating coil according to the embodiment of the present invention,
FIG. 3 is a schematic perspective view of a main part of the high-frequency heating coil according to the embodiment of the present invention, and FIG. 4 is a schematic explanatory view showing a relationship between the high-frequency heating coil and the cylindrical work according to the embodiment of the present invention. FIG. 5 is a schematic cross-sectional view showing induction hardening of a side surface of a groove of a cylindrical work using a high-frequency heating coil according to an embodiment of the present invention, and FIG. 6 is a view showing another embodiment of the present invention. It is a schematic perspective view of the principal part of a high frequency heating coil.

A high-frequency heating coil 1000 according to an embodiment of the present invention is a high-frequency heating coil for heating opposing side surfaces WM of three grooves WA formed on the inner surface of a tripod cup WC as a cylindrical work. There are three heating units 100A, 100B, 100C and this heating unit 1
It has a pair of connecting parts 200A, 200B that connect 00A, 100B, 100C in series, and a pair of feeding parts 300A, 300B that connect to the high-frequency power supply 400.

[0010] The tripod cup portion WC includes:
As shown in FIG. 5, the shaft portion WS is continuously provided. The tripport cup WC as this cylindrical work
Is formed in a cylindrical shape with a bottom, and three grooves WM are formed on the inner surface at intervals of 120 °.

The heating units 100A, 100B, 100C
Have almost the same configuration, and will be described first with reference to the heating unit 100A as an example. As shown in FIG. 2, the heating unit 100 </ b> A includes a pair of heating conductors 11 facing the side surface portion WM.
0A, 120A, a pair of power supply conductors 130A, 140A connected to the high frequency power supply 400, a first connection conductor 150A connecting between one power supply conductor 130A and one heating conductor 110A, The one heating conductor 1
10A and a second connection conductor 160A that connects the other heating conductor 140A to the other heating conductor 140A. The first connection conductor 150A and the second connection conductor 160A divide the high-frequency current into two. And the parallel parts 151A and 161A.

The heating section 100A uses the side surface W of the groove WA.
The part involved in the heating of M is a pair of heating conductors 110
A, 120A. In addition, this heating unit 100A connects a pipe-shaped member by attaching a lid to a conductive copper square pipe or gutter-like member so as to circulate a cooling liquid to prevent overheating of the heating unit 100A. It is configured.

First, the first connection conductor 150A is
A horizontally long parallelogram-shaped parallel portion 151A and this parallel portion 15
It has protruding portions 152A and 153A connected to both ends of 1A. The width dimension of the parallel portion 151A is
A and 153A are set to の of the width dimension. Therefore, the high-frequency current from the protrusions 152A and 153A is
It is bisected in the parallel section 151A.

Projection 1 of first connection conductor 150A
52A is connected to one power supply conductor 130A. One of the power supply conductors 130A has a through hole 131A into which the other power supply conductor 140A is inserted.

The second connection conductor 160A is
The configuration is the same as that of the first connection conductor 150A described above. In other words, the second connection conductor 160A is composed of a horizontally elongated parallel-shaped parallel part 161A and a parallel part 161A.
A has protrusions 162A and 163A connected to both ends of A. The width of the parallel portion 161A is the same as the protrusion 162A,
The width is set to の of the width of 163A.

The second connection conductor 160A
Are vertically opposed to the first connection conductor 150A at a predetermined interval.

The heating conductor 110A is disposed between the first connection conductor 150A and the second connection conductor 160A. That is, the first connection conductor 150A
Is disposed between the projection 153A of the second connection conductor 160A and the projection 162A of the second connection conductor 160A. The heating conductor 110A faces the side surface WM of the groove WA at a predetermined interval. The width of the heating conductor 110A is set to be equal to the protrusions 153A,
It is set to the same width as 62A.

The heating conductor 120A is connected to the projection 163A of the second connection conductor 160A at a substantially right angle in the horizontal direction. Moreover, the heating conductor 120A is parallel to the heating conductor 110A.

The heating conductor 120A is provided with the power supply conductor 1 inserted into the through hole 131A of the power supply conductor 130A.
40A. That is, this heating conductor 1
In 20A, the portion inserted into the through-hole 131A becomes the power supply conductor 140A. The heating conductor 120A is bent in a crank shape immediately before the power supply conductor 130A.

The power supply conductors 130A and 140A are connected to the high frequency power supply 400 as described above. Therefore, the high-frequency current in the heating section 100A is changed from the power supply conductor section 130A to the first connection conductor section 150A (the projecting section 15A).
2A → Parallel part 151A → Protrusion 153A) → Heating conductor 110A → Second connection conductor 160A (Protrusion 162A)
→ parallel part 161A → projecting part 163A) → heating conductor part 12
The current flows in the order of 0A → power supply conductor 140A or vice versa.

As shown in FIG. 3, the heating section 100A thus configured includes a parallel section 151A of the first connection conductor section 150A and a parallel section 16A of the second connection conductor section 160A.
A core 4 made of ferrite or the like penetrating through 1A in the vertical direction.
10, and a substantially U-shaped core 420 attached outward to the parallel portions 151A, 161A. By attaching these cores 410 and 420 to the parallel part 151A and the like, the heating conductor parts 110A and 120
The side surface portion WM of the groove portion WA facing A is heated more intensively.

The heating units 100B and 100C, which are substantially the same as the heating unit 100A thus configured, are combined as shown in FIG. 1 to form a high-frequency heating coil 1000.
That is, the heating unit 100A is connected to the heating unit 100B by the connection unit 200A, and the heating unit 100B is connected to the connection unit 20B.
OB is connected to the heating unit 100C. The connection conductor 140A of the heating unit 100A is connected to the power supply unit 300A.
In addition, the connecting conductor 130C of the heating unit 100C is
0B. This means that the three heating units 100A, 100B, and 100C are connected in series to the high-frequency power supply 400.

The heating units 100A, 100B, 1
A cooling jacket (not shown) is arranged below 00C. The cooling jacket includes heating units 100A, 1
00B, 100C heating conductors 110A, 120A, 1
The cooling liquid is injected to the portions heated at 10B, 120B, 110C, and 120C, that is, the side surfaces WM of the groove portions WA to cool them.

The high-frequency heating coil 1 constructed as described above
000 performs the induction hardening of the side surface portion WM of the groove portion WA of the tripod cup portion WC as follows. The tripod cup section WC includes a mounting table 500 having an opening 510.
Is placed with the open side facing down. The opening 510
Are set in conformity with the shape of the open end of the tripod cup portion WC.

Further, an external cooling jacket 600 is provided around the tripod cup WC to prevent the tripod cup WC from being overheated.

From the opening 510, the high-frequency heating coil 10
00 is inserted into the tripod cup portion WC and moves from the open side to the closed side. Along with this movement, a high-frequency current is supplied from the high-frequency power supply 400 to the high-frequency heating coil 1000, so that the side surface WM of the groove WA is provided.
Are sequentially the heating conductor portions 110A, 120A, 110B, 120B, 110 of the heating portions 100A, 100B, 100C.
By C and 120C, heating is performed from the open side to the closed side.

Each of the heating units 100A, 100B, 1
Cooling jacket provided below 00C (not shown)
Induction quenching is performed on the side surface portion WM by the cooling liquid injected from the inside.

When the high-frequency heating coil 1000 reaches the closed portion of the tripod cup section WC, the supply of the high-frequency current is stopped, the high-frequency heating coil 1000 is extracted from the tripod cup section WC, and the next new A suitable tripport cup WC is placed.

In the high-frequency heating coil 1000 according to the above-described embodiment, each of the heating units 100A, 100B,
100C parallel parts 151A, 161A, 151B, 16
1B, 151C, and 161C, each having a protrusion 15 at each end.
2A, 153A, 152B, 153B, 152C, 15
3C, 162A, 163A, 162B, 163B, 16
2C and 163C are provided, but as shown in FIG. 6, these upper and lower parallel portions 151A and 16
1A, 151B, 161B, 151C, 161C are connected to the heating conductors 110A, 120A, 110B, 120B, 11
You may make it connect directly at 0C and 120C.

In the above-described embodiment, the side surface portion WM of the groove portion WA of the tripod cup portion WC is heated, but the high frequency heating coil according to the present invention is not limited to this. Of course, it may be the side surface of the groove on the inner surface of another cylindrical work.

[0031]

The high-frequency heating coil according to the present invention is a high-frequency heating coil for heating a side face of a groove formed on the inner surface of a cylindrical work, and a pair of heating conductors facing the side face. A pair of power supply conductors connected to the high-frequency power supply, a first connection conductor connecting between one power supply conductor and one heating conductor, and one heating conductor and the other heating conductor. And a second connection conductor for connecting to the conductor. The first and second connection conductors have a parallel portion for dividing a high-frequency current into two.

As a result, in the first and second connection conductors, the current is reduced by half, so that the opposite surface, that is, the bottom surface of the groove is not heated, and induction hardening is applied only to the side surface. Will be applied. As a result, induction hardening is not performed on the bottom surface.

Another high-frequency heating coil according to the present invention is a high-frequency heating coil for heating opposite side surfaces of a plurality of grooves formed on the inner surface of a cylindrical workpiece, and the plurality of high-frequency heating coils fitted into the grooves. Heating units, a plurality of connecting units that connect the heating units in series, and a power supply unit that is connected to a high-frequency power supply. The heating unit includes a pair of heating units facing the side surface unit. A conductor portion, a pair of power supply conductor portions connected to the high-frequency power supply, a first connection conductor portion connecting between one power supply conductor portion and one heating conductor portion, and the one heating conductor portion and the other. And a second connection conductor that connects between the heating conductor and the first and second connection conductors. The first and second connection conductors have a parallel portion that bisects a high-frequency current.

For this reason, in the high-frequency heating coil, high-frequency quenching is similarly performed only on the side surfaces of a cylindrical work having a plurality of grooves.

Further, it is preferable that the tripod cup portion in which three grooves are formed on the inner surface at 120 ° intervals is a cylindrical work.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a high-frequency heating coil according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view of a main part of the high-frequency heating coil according to the embodiment of the present invention.

FIG. 3 is a schematic perspective view of a main part of the high-frequency heating coil according to the embodiment of the present invention.

FIG. 4 is a schematic explanatory view showing a relationship between a high-frequency heating coil and a cylindrical workpiece according to the embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view showing induction hardening of a side surface of a groove of a cylindrical work using the high-frequency heating coil according to the embodiment of the present invention.

FIG. 6 is a schematic perspective view of a main part of a high-frequency heating coil according to another embodiment of the present invention.

FIG. 7 is a schematic perspective view of a conventional high-frequency heating coil of this type.

FIG. 8 is a schematic bottom view of a tripod cup portion as a cylindrical work heated by high frequency (induction hardening) by this type of high frequency heating coil.

[Explanation of symbols]

 100A, 100B, 100C Heating section 200A, 200B Connection section 300A, 300B Power supply section 110A, 120A Heating conductor section 130A, 140A Power supply conductor section 150A First connection conductor section 151A Parallel section 160A Second connection conductor section 161A Parallel section

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C21D 1/10 C21D 1/42 C21D 9/40 H05B 6/00-6/10 H05B 6/14-6 / 44

Claims (3)

(57) [Claims] 1. A high-frequency heating coil for heating a side face of a groove formed on an inner surface of a cylindrical workpiece, wherein the side face faces the groove.
A pair of heating conductors facing the side surface, a pair of power supply conductors connected to the high-frequency power supply, and a first connection conductor connecting between the one power supply conductor and the one heating conductor. A second connecting conductor connecting between the one heating conductor and the other heating conductor, wherein the first and second connecting conductors bisect a high-frequency current. A high-frequency heating coil having a parallel portion. 2. A high-frequency heating coil for heating opposite side surfaces of a plurality of grooves formed on an inner surface of a cylindrical workpiece, wherein the plurality of heating units fitted into the grooves and the heating units are connected in series. A plurality of connection portions, and a power supply portion connected to a high-frequency power supply, wherein the heating portion has a pair of heating conductor portions facing the side surface portion and a pair of power supply portions connected to the high-frequency power supply. A conductor portion, a first connection conductor portion connecting between one power supply conductor portion and one heating conductor portion, and a second connection portion connecting between the one heating conductor portion and the other heating conductor portion. Wherein the first and second connection conductors have a parallel portion that bisects a high-frequency current. 3. The high-frequency heating coil according to claim 2, wherein the cylindrical work is a tripod cup portion having three grooves formed on the inner surface thereof at intervals of 120 °.