JPH0318495Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to an induction hardening device for integral constant velocity joints used in automobiles and the like.

<Prior Art> Hereinafter, a conventional induction hardening apparatus for induction hardening the transfer surface of an integral constant velocity joint will be described with reference to the drawings. FIG. 5 is a perspective view of an integral type joint (hereinafter simply referred to as joint) used in automobiles and the like. This joint 10a has a plurality of steps 18, and a substantially cylindrical peripheral wall 19 is formed at the end of each step 18. And the surrounding wall 19
has a thick part 11, a thin part 12, and a transfer surface 13 that gently connects the thick part 11 and the thin part 12.

For the function of such a joint 10a, it is necessary to harden the transfer surface 13 by quenching.
To perform this hardening by so-called one-shot hardening, a high-frequency heating coil 20 made of a metal tube is used, as shown in FIG.

FIG. 6 is a perspective view of a conventional high-frequency heating coil. The high frequency heating coil 20 is made of a highly conductive metal tube.
A plurality of linear coils 22 parallel to each other arranged to correspond to the transfer surface 13 of the joint 10a when inserted into the peripheral wall 19 of the joint 10a, and a lower connection that alternately connects the lower ends of the adjacent linear coils 22. It has a coil 21 and an upper connection coil 23 that alternately connects the upper ends of adjacent linear coils 22 to each other. Therefore, all linear coils 22 are connected in series. One bottom connection coil 21
is cut and pulled out, and connected to a high frequency power source 60.

FIG. 7 shows a state in which the induction hardening device, which combines a cooling liquid supply tube and a high-frequency heating coil, is inserted into the peripheral wall of the joint, FIG. 7a is a cross-sectional explanatory view, and FIG. It is a sectional view taken along the line A-A in Figure a. Coolant supply tube 30a that supplies quenching coolant
and the vicinity of the bottom of the high-frequency heating coil 20 are fixed to a connecting member 33. And the connecting member 33
is formed so as to close the space between the linear coil 22 of the high-frequency heating coil 20 and the coolant supply cylinder 30a. The cooling liquid supply cylinder 30a is arranged approximately at the center of the plurality of linear coils 22, and the cooling liquid for quenching is supplied to the opening 31 at the lower end of the cooling liquid supply cylinder 30a, and the cooling liquid is supplied from the opening 32 at the upper end. is discharged.

To perform induction hardening on the transfer surface 13 of the joint 10a, as shown in FIG. It is arranged facing the transfer surface 13.
Then, the high frequency heating coil 2 is connected to the high frequency power source 60.
After energizing 0, the opening 3 at the lower end of the coolant supply tube 30a
When a cooling liquid for quenching is supplied to 1, the cooling liquid is discharged from the opening 32 of the cooling supply tube 30a and flows into the cavity 13.
Then, after cooling the transfer surface 13, it flows down along the inner surface of the peripheral wall 19 of the joint 10a. Then, a hardened layer is formed on the transfer surface 13.

<Problem to be solved by the invention> However, in recent years, it has become necessary to perform induction hardening on the transfer surface of a joint having a shape different from that described above. As shown in FIG. 4, this joint 10 has a notch 14 formed in a thin portion 12. As shown in FIG. When this joint 10 is hardened using the conventional induction hardening device, the transfer surface 13 can be heated in the same manner as before, but the cooling liquid supply tube 3
The coolant injected from the opening 32 at the upper end of the cooling liquid hits the top surface of the inner surface of the peripheral wall 19, and then reaches the notch 1.
There is a problem in that the transfer surface 13 cannot be sufficiently cooled, and therefore a predetermined hardened layer cannot be formed on the transfer surface 13.

The present invention was devised in view of the above circumstances, and the purpose is to provide an induction hardening device that can harden the transfer surface even if a notch is formed in the thin wall part of the joint. It is said that

<Means for Solving the Problems> In order to solve the above problems, the induction hardening apparatus of the present invention has thick parts and thin parts provided alternately, and connects these thick parts and thin parts gently. Induction hardening for hardening the transfer surface after inserting into the circumferential wall of an integral constant velocity joint having a substantially cylindrical circumferential wall at its end that includes a transfer surface and a notch provided in the thin wall portion. An apparatus comprising a high frequency heating coil and a cooling jacket coupled to the coil;
The coil has a plurality of linear coils facing the transfer surface and parallel to the direction of insertion during the insertion,
The cooling jacket has a cooling liquid supply tube disposed approximately at the center of the linear coil and having a plurality of openings on the side surface, and both side surfaces are in close contact with the adjacent linear coils, and when inserted, the cooling jacket The cooling liquid injection plate is located between the transfer surface and has a cooling liquid injection hole formed therein for injecting the cooling liquid supplied from the opening.

<Operation> A high-frequency heating coil is inserted into the peripheral wall of the integral constant velocity joint, and the linear coil is placed opposite the transfer surface. When a cooling liquid for the high-frequency heating coil is supplied to the high-frequency heating coil and a high-frequency current is applied from a high-frequency power source, the high-frequency current flows through the linear coil. This high frequency current induces a high frequency current on the transfer surface, and the induced high frequency current heats the transfer surface. When energization heating for a predetermined period of time is completed, the coolant is supplied from the opening in the coolant supply cylinder.
This coolant is injected from the coolant injection holes of the coolant injection plate. The injected cooling liquid directly hits the transfer surface of the integral constant velocity joint and cools the entire workpiece by surrounding it.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings. FIGS. 1 to 4 are drawings for explaining one embodiment of the present invention, and FIG. 1 shows the induction hardening device inserted into the peripheral wall 19 of the joint, and FIG. B-line arrow cross-sectional explanatory diagram, Figure 2 is a partially cutaway perspective view, Figure 3 is A-A in Figure 1.
FIG. 4 is a perspective view of a joint having a notch in a thin wall portion. Components that are the same as those in the prior art will be described with the same reference numerals.

As shown in FIG. 4, the joint hardened by the induction hardening apparatus of this embodiment has a notch 14 formed in a thin wall portion 12. As shown in FIG. Therefore, the side surface of the notch 14 becomes the transfer surface 13. Others are 7th
Since it is similar to the conventional joint 10 shown in the figure, the explanation will be omitted.

The induction hardening apparatus 300 of this embodiment hardens the transfer surface 13 of the joint 10,
It includes a coil section 100 and a cooling jacket 200.

The coil section 100 includes a high frequency heating coil 20 and a core 25. High frequency heating coil 20
This is different from the conventional method in that the core 25 is provided between the linear coils 22 formed so as to face the transfer surface 13 of the joint 10 when the induction hardening device 300 is inserted into the peripheral wall 19 of the joint 10. The only difference from the high-frequency heating coil is that the other parts are the same as the conventional high-frequency heating coil, so a description thereof will be omitted.

The cooling jacket 200 includes a cooling liquid supply tube 30,
Coolant spray plate 36, coolant supply cylinder lower support member 3
3, and a cooling liquid supply cylinder upper support member 34. A plurality of openings 35 are provided in the side surface of the approximately cylindrical cooling liquid supply cylinder 30 . The coolant supply cylinder 30 has an opening 31 at the lower end, the lower end part passes through the coolant supply cylinder lower support member 33 and is fixed at this penetrating part, and the upper end part passes through the coolant supply cylinder upper support member 34. It is fixed and blocked. A joint 1 is installed around the coolant supply tube 30.
The coolant spray plate 3 is placed so as to face the thick wall portion 11 of the
6 are arranged, and the upper and lower ends of the coolant injection plate 36 are connected to the coolant supply cylinder upper support member 34, respectively.
and is held by a cooling liquid supply cylinder lower support member 33. The coolant injection plate 36 is provided with two slit-shaped coolant injection holes 37 in the vertical direction (vertical direction in FIG. 2), and the induction hardening device 3
00 is inserted into the peripheral wall 19 of the joint 10, the coolant injection hole 37 is formed to be located between the transfer surface 13 and the linear coil 22.
Then, the side surface 38 of the coolant injection plate 36 is closely fixed to the linear coil 22 of the high-frequency heating coil 20, so that the coil portion 100 and the cooling jacket 200 are combined to form the high-frequency hardening device 300. .

As shown in FIG. 2, the induction hardening apparatus 300 is fixed on a table 50, and on the table 50,
Jacket cover 4 surrounding induction hardening device 300
0 is attached. The upper end of the jacket cover 40 is open, and a space is provided between the jacket cover 40 and the induction hardening device 300 into which the thick portion 11 of the joint 10 can be inserted.

Next, the operation of this embodiment will be explained.

The joint 10 or the induction hardening device 300 is moved by a moving device (not shown), the induction hardening device 300 is inserted into the peripheral wall 19 of the joint 10, and the induction heating coil 2 is inserted into the peripheral wall 19 of the joint 10, as shown in FIG.
0 linear coil 22 to the transfer surface 1 of the joint 10
3. A cooling liquid for the high-frequency heating coil 20 is supplied to the high-frequency heating coil 20 . Next, as shown in FIG. 6, when a high frequency current is applied from the high frequency power source 60 to the high frequency heating coil 20, the high frequency current flows through the lower connecting coil 21, the linear coil 22, and the upper connecting coil 23. Straight coil 2
A high frequency current is induced in the transfer surface 13 by the high frequency current flowing through the transfer surface 13 . The transfer surface 13 is heated by the induced high frequency current. When the electrical heating for a predetermined period of time is completed, the cooling liquid for quenching is supplied to the opening 31 at the lower end of the cooling liquid supply cylinder 30. This coolant is discharged from the opening of the coolant supply tube 30 as shown by the arrow P, flows into the space between the coolant injection plate 36 and the coolant supply tube 30, and then enters the space between the coolant injection plate 36 and the coolant supply tube 30. The coolant is injected from the coolant injection hole 37 as shown by arrow Q. The coolant injected from the coolant injection hole 37 hits the transfer surface 13 of the joint 10, cools the transfer surface 13, and falls downward (downward in FIG. 2), damaging the induction hardening device 300 and the jacket cover. It accumulates in the space between 40 and 40. The collected cooling liquid is removed by a draining means (not shown) before heating the next joint 10.

<Effects of the Invention> As explained above, the induction hardening apparatus of the present invention has an induction heating coil and a cooling jacket coupled to the coil, and the coil allows the induction hardening apparatus to be placed within the peripheral wall of the joint. The cooling jacket has a plurality of straight coils that are parallel to the insertion direction and face the transfer surface during insertion, and the cooling jacket has a cooling liquid supply tube with a plurality of openings on the side, and a cooling liquid supply cylinder with a plurality of openings on the side, and a cooling liquid supply cylinder with a plurality of holes on both sides of the cooling It has a coolant spray plate that is in close contact with the coil and is located between the linear coil and the transfer surface when inserted, and has a coolant spray hole formed therein for spraying the coolant supplied from the opening.

Therefore, when a joint is hardened using the induction hardening apparatus of the present invention, sufficient cooling liquid is supplied to the transfer surface of the joint, so that a predetermined hardened layer can be formed, and moreover, rapid cooling is possible. Since the entire workpiece is immersed, uniform cooling is possible and products with less distortion can be produced.

[Brief explanation of the drawing]

1 to 4 are drawings for explaining one embodiment of the present invention, in which FIG. 1 shows the state in which the induction hardening device is inserted into the peripheral wall of the joint, and B-B in FIG. 2 is a partially cutaway perspective view, FIG. 3 is an explanatory cross-sectional view taken along the line A-A in FIG. 1, and FIG. FIG. 5 to 7 are drawings for explaining a conventional induction hardening apparatus, in which FIG. 5 is a perspective view of a conventional joint, and FIG. 6 is a perspective view of a conventional induction heating coil. FIG. 7 shows a state in which the induction hardening device, which combines a cooling liquid supply tube and a high-frequency heating coil, is inserted into the peripheral wall of the joint, FIG. 7a is a cross-sectional explanatory view, and FIG. It is a sectional view taken along the line A-A in Figure a. 10a...Joint, 11...Thick walled part, 12
... Thin wall part, 13 ... Transfer surface, 14 ... Notch part, 19 ... Peripheral wall, 20 ... High frequency heating coil,
22... Straight coil, 30... Coolant supply tube, 3
5... Opening hole, 36... Cooling liquid injection plate, 37... Cooling liquid injection hole, 200... Cooling jacket, 300
...Induction hardening equipment.

Claims (1)

[Scope of utility model registration request] A substantially cylindrical peripheral wall formed of alternately provided thick and thin parts, a transfer surface that smoothly connects these thick and thin parts, and a notch provided in the thin part is attached to the end. An induction hardening device for hardening the transfer surface after insertion into the peripheral wall of an integral constant velocity joint provided in , the cooling jacket has a plurality of linear coils facing the transfer surface and parallel to the direction of insertion during the insertion, and the cooling jacket is arranged approximately at the center of the linear coils and has a plurality of openings on the side thereof. A cooling liquid jet whose supply cylinder and both side surfaces are in close contact with the adjacent linear coils, which are located between the linear coils and the transfer surface when inserted, and which inject the cooling liquid supplied from the openings. An induction hardening device characterized by having a coolant spray plate with holes formed therein.