JP2001226717A - High-frequency hardening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-frequency hardening device which applies high-frequency hardening to works having shaft parts subjected to machining and cup parts not subjected to machining at end faces. SOLUTION: This high-frequency hardening device has a dividing station 100 which divides the work W, a first hardening station 200 which applies high-frequency hardening to the cup part WC of the work W divided by the same, a second hardening station 300 which applies high-frequency hardening to the shaft part WS of the work W subjected to the high-frequency hardening at the cup part WC, an ejection station 400 which ejects the work W subjected to the high-frequency hardening in the first hardening station 200 and the second hardening station 300 and a work moving mechanism 500 which moves the work W between the respective stations 100 to 400. The device clamps only the shaft part WS of the work W, moves the same, clamps only the shaft part WS of at least the work W and executes the high-frequency hardening of the cup part in the first station 200 in the state of floating the end face in universe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work having a machined shaft part and a cup part whose end face is not machined, for example, a high-frequency wave applied to a shaft part and a cup part of a constant velocity joint. The present invention relates to an induction hardening device for performing hardening.

[0002]

2. Description of the Related Art Cup W used in constant velocity joints
As shown in FIG. 3 and the like, a cup portion WC and a shaft portion WS protruding from the cup portion WC are integrally provided. In the cup W, since a bearing or the like hits a groove formed on the inner surface of the cup WC, induction hardening is performed on the groove. In addition, the shaft portion WS must be subjected to induction hardening.

[0003] An induction hardening device for performing induction hardening on a groove portion and a shaft portion WS of an inner surface of a cup portion WC of the cup W includes an indexing station for indexing the work W, and an indexing station for the work W indexed by the indexing station. A first quenching station for performing induction hardening on the shaft portion WS, a second quenching station for performing induction hardening on the cup portion WC of the work W having the shaft portion WS subjected to induction hardening, And a carry-out station for carrying out the work W subjected to the induction hardening at the second quenching station, and a work moving mechanism for moving the work W between the stations.

A first quenching station for performing induction hardening on a groove on the inner surface of the cup WC includes a base 9 on which the cup W is placed so that the open side of the cup WC faces downward.
00 (see FIG. 5), a first high-frequency heating coil 800 for heating the cup portion WC of the workpiece W placed on the base 900, and if the heating by the first high-frequency heating coil 800 is completed, It has a first coolant jacket (not shown) for injecting coolant to the heated shaft portion WS.

[0005] The base 900 has an opening 910 into which the first high-frequency heating coil 800 is inserted.

A second quenching station for performing induction hardening on the shaft portion WS is provided with a base on which the workpiece W is placed so that the open side of the cup WC faces downward, and a second quenching station is set up on the base portion. Through the opening WC
And a second coolant jacket for injecting coolant to the heated shaft portion WS when heating by the second high-frequency heating coil is completed. are doing.

[0007]

However, a cup W has emerged that cannot be handled by the conventional induction hardening apparatus described above. That is, the open end face W of the cup portion WC
C1 does not provide a significant difference in performance as a constant velocity joint, even without machining. For this reason,
The end face WC1 may be used without being machined, that is, with a rough surface having irregularities. In this case, in the conventional induction hardening apparatus, since the cup W is placed on the base, the cup W is placed at an accurate position with respect to the first and second high-frequency heating coils due to the unevenness existing on the end face WC1. It cannot be placed. That is, the index in the previous process becomes completely meaningless. Therefore, in some cases, the first or second high-frequency heating coil may come into contact with the inner surface of the shaft WS or the cup WC.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides an induction hardening apparatus in which the indexing of a previous process is effective as it is at the time of induction hardening even for a work having a part that has not been machined. It is intended to be.

[0009]

SUMMARY OF THE INVENTION An induction hardening apparatus according to the present invention is an induction hardening apparatus for a workpiece having a machined shaft portion and a cup portion whose end surface is not machined. An indexing station for indexing a workpiece, a first quenching station for induction hardening a cup portion of the workpiece indexed at the indexing station, and a shaft portion for a workpiece having an induction hardened cup portion. A second quenching station for performing induction hardening, an unloading station for unloading the work subjected to induction hardening at the first and second quenching stations, and a work moving mechanism for moving the work between the stations And the moving mechanism grasps and moves only the shaft portion of the work, and at least moves only the shaft portion of the work. Lifting and, first in a state where the end face is up in the air
In the station, induction hardening of the cup portion is performed.

[0010]

FIG. 1 is a schematic configuration diagram of an induction hardening apparatus according to an embodiment of the present invention, and FIG. 2 is a first high frequency hardening apparatus used in the induction hardening apparatus according to the embodiment of the present invention. FIG. 3 is a schematic cross-sectional view showing a relationship between a heating coil and a cup portion of a work, FIG. 3 is a schematic front view of a work to be induction hardened by an induction hardening apparatus according to an embodiment of the present invention, and FIG. It is a schematic explanatory view for explaining movement of the induction hardening device concerning an embodiment of the invention.

An induction hardening device according to an embodiment of the present invention is an induction hardening device for a workpiece having a machined shaft portion WS and a cup portion WC whose end surface is not machined. An indexing station 100 for indexing the work W, a first quenching station 200 for induction hardening the cup WC of the work W indexed by the indexing station 100, and an induction hardening for the cup WC. Quenching station 300 for performing induction quenching on shaft portion WS of workpiece W subjected to quenching
An unloading station 400 for unloading the workpiece W subjected to induction hardening at the first quenching station 200 and the second quenching station 300;
0, 200, 300, and 400, and a work moving mechanism 500 for moving the work W. The moving mechanism 500 grips and moves only the shaft portion WS of the work W, and at least moves the work W. Shaft W
In the first station 200, induction hardening is performed in the first station 200 while holding only S and the end surface is suspended in the air.

First, a workpiece W to be subjected to induction hardening by the induction hardening device is machined at a portion where accuracy is required, that is, an inner surface of the cup portion WC and a shaft portion WS. However, a portion where accuracy is not required, that is, an end surface WC1 on the open side of the cup portion WC is not machined, and thus has irregularities. It is assumed that the cup portion WC in the description of the present embodiment is a so-called tripod type in which three groove portions WC2 to WC4 are formed at equal intervals as shown in FIG.

The indexing station 100 performs so-called indexing in the same manner as the positions of the grooves WC2 to WC4 of the cup WC when the induction hardening is performed. Also, this indexing station 100
Detects not only the index, but also the type of the work W, for example, the type of the automobile using the constant velocity joint as the work W.

The moving mechanism 500 grips the shaft portion WS of the workpiece W and moves it from the indexing station 100 to the first quenching station 200, the second quenching station 300, and the unloading station 400. The moving mechanism 500 has a moving unit (not shown) that simultaneously moves the first to third three chuck units 510 to 530.

The first to third three chuck portions 510
530 are the first chuck portions 5 as shown in FIG.
When 10 is located above indexing station 100, second chuck 520 is located above first heating station 200 and third chuck 530 is located above second heating station 300. It has become. When the first chuck unit 510 is located above the first heating station 200, the second chuck unit 520 is connected to the second heating station 300.
Above, the third chuck portions 530 are respectively located above the unloading station 400.

The fourth chuck 540 is provided at the first quenching station 200, and the fifth chuck 550 is provided at the unloading station 400.

On the other hand, the first quenching station 200
A first high-frequency heating coil 210 for heating the grooves WC2 to WC4 on the inner surface of the cup WC, and the grooves WC2 to WC2 heated by the first high-frequency heating coil 210.
A first coolant jacket (not shown) for injecting coolant into the WC 4;

For example, as shown in FIG. 2, the first high-frequency heating coil 210 has grooves WC2 to WC2 of a cup WC.
It has three heating conductors 211 inserted into C4, a connection conductor 212 for connecting the heating conductors 211, and a pair of power supply conductors 213. The first high-frequency heating coil 210 is configured such that a coolant circulates therein to prevent overheating of the first high-frequency heating coil 210 when a high-frequency current is supplied.

The first high-frequency heating coil 210
Below the heating conductor 211, there is provided a first coolant jacket for injecting a coolant to cool the portion heated by the heating conductor 211, that is, the cup WC. Although not shown, the groove WC2
In order to prevent overheating of .about.WC4, an outside cooling jacket (not shown) for injecting a cooling liquid from outside the cup portion WC is also provided.

On the other hand, the second quenching station 300
Includes a second high-frequency heating coil 310 for heating the shaft portion WS, and a second coolant jacket (not shown) for injecting a coolant to the shaft portion WS heated by the second high-frequency heating coil 310. Have.

The second high-frequency heating coil 310 has a primary-side conductor connected to a high-frequency power supply, and a secondary-side conductor through which a high-frequency current flows by an induced current from the primary-side conductor. . This second high-frequency heating coil 31
Reference numeral 0 denotes a so-called primary conductor and a secondary conductor that are mechanically separated from each other, and the heating range of the shaft portion WS can be changed by moving the secondary conductor. It is a rubber coil.

In addition, the second high-frequency heating coil 31
For 0, a plurality of types corresponding to the length of the shaft portion WS are prepared. In the following description, it is assumed that there are two second high-frequency heating coils 310. Which one to select is determined by the detection result at the indexing station 100.

The second high-frequency heating coil 310
At the side of the heated portion, that is, the shaft portion WC
A second coolant jacket for injecting coolant to cool the cooling water.

Further, the second heating station 30
0 is provided with a tempering coil 320 for tempering the shaft portion WS subjected to induction hardening.

The induction quenching apparatus configured as described above,
Induction hardening of the work W is performed as follows. In this description, works are numbered like work W ₁ and work W ₂ to clarify the order of induction hardening. Further, in FIG.
400 is indicated by a circle, and when there is a work W in the station, the work W is indicated in the circle. When each of the chuck portions 510 to 530 is gripping the work W,
The work W is shown in each of the chuck portions 510 to 530.

First, the first work W ₁ placed on the indexing station 100 is indexed while the type of the vehicle is detected (see FIG. 4A).

The first work W ₁ indexed by the indexing station 100 is a first chuck 51
At 0, the shaft portion WS is gripped (see FIG. 4B).
Then, the first workpiece W ₁ is moved to the first quenching station 200 follows (see FIG. 4 (C)). That is, the first to third chuck portions 510 to 530 move rightward by one step in FIG.
Note that the indexing station 100, is the next second workpiece W ₂ is set.

1 which has reached the first quenching station 200
The fourth workpiece W ₁ is gripped by the fourth chuck 540 on the shaft WS. At the same time, the first chuck portion 510 is released from the gripping. That is, the first workpiece W ₁ is gripped and switched from the first chuck section 510 to the fourth chuck section 540.

The grooves WC2 to WC2 on the inner surface of the cup part WC of the _first work W1 held by the fourth chuck part 540
Induction hardening is performed on C4 by the first high-frequency heating coil 210. The first work W ₁ is placed on the inside of the cup part WC with the first high-frequency wave kept in a state where the fourth chuck part 540 holds the shaft part WS, that is, with the cup part WC floating in the air. Heating coil 21
0 is inserted, and induction hardening of the grooves WC2 to WC4 is performed. Accordingly, the open end face W of the cup WC
Even if C1 remains rough without any machining, the indexing position does not become meaningless as in the conventional case.

While the induction hardening is being performed in the first hardening station 200, the first chuck portion 510 that has not gripped anything returns to its original position, that is, the indexing station 100. That is, the first to third chuck portions 510 to 530 move to the left by one step in FIG. On the other hand, the grooves WC2 to WC
Workpiece W ₁ to induction hardening has been completed C4 from the fourth chuck portion 540, it is replaced gripped second chuck portion 520. The first chuck 510 grips the next second workpiece W ₂ (see FIG. 4 (D)).

The first workpiece W ₁ to the second quench station 300 follows the second workpiece W ₂ is conveyed to the first quenching station 200 (see FIG. 4 (E)). In the second quenching station 300, high-frequency quenching is performed on the shaft portion WS of the _first work W1 by the second high-frequency heating coil 310 and the second coolant jacket. The induction hardening of the shaft portion WS is performed by the second induction heating coil 310 corresponding to the vehicle type detected at the indexing station 100.
On the other hand, in the first quench station 200, second workpiece W ₂ is induction hardening is performed on the groove WC2~WC4 in a state gripped by the first chuck 510.

Since the tempering coil 320 is provided in the second quenching station 200, tempering of the shaft portion WS can be performed as needed.

Next, the first chuck unit 510 goes to the indexing station 100, and the second chuck unit 520 goes to the first
To the quenching station 200. That is, it moves leftward by one step in FIG.

The third chuck section 530 includes a shaft section WS
Of the first workpiece W ₁ to induction hardening has been completed, the second chuck 520 of the second high-frequency hardening of the groove WC2~WC4 has finished workpiece W _2, the first chuck 51
0 grips the _third work W3 set in the indexing station 100 and completed the indexing, respectively (see FIG. 4F).

Next, first to third chuck portions 510 to 5
30 is moved to the right by one step, the first work W ₁ to output station 400, the second workpiece W ₂
To the second quenching station 300, the third work W
₃ are moved to the first quenching station 200, respectively. At the same time, the indexing station 10
0 The following fourth workpiece W ₄ are set in (FIG. 4
(G)).

No. 1 moved to unloading station 400
Eye work W₁Is high due to the fifth chuck portion 550.
It is carried out of the quenching device. Also, the first channel
510 is the fourth workpiece W_FourTo the second chuck
The part 520 is the third work W _ThreeTo the third chuck portion 5
30 is the second work W_TwoThe next step.
Transport to the station. Also, at the same time,
Station 100 has the next new fifth work W_Five
Is set (see FIG. 4 (I)).

In this manner, high frequency quenching of the groove portions WC2 to WC4 of the cup portion WC of the work W and the shaft portion WS is performed one after another.

[0038]

The induction hardening apparatus according to the present invention is an index hardening apparatus for a workpiece having a machined shaft portion and a cup portion whose end face is not machined. Quenching station, a first quenching station for performing induction hardening on the cup portion of the work indexed by the indexing station, and induction hardening for the shaft portion of the workpiece having the cup portion induction hardened. A second quenching station to perform;
And an unloading station for unloading the work subjected to induction hardening at the second quenching station, and a work moving mechanism for moving the work between the stations, wherein the moving mechanism includes a shaft portion of the work. Only the workpiece is gripped and moved, and at least only the shaft portion of the workpiece is gripped, and the cup portion is induction hardened at the first station with the end face floating in the air.

Therefore, according to this induction hardening apparatus,
When induction hardening is performed on the cup portion at the first quenching station, it is not necessary to mount the cup portion on the base as in the conventional case, so that the end face is not machined and there is unevenness. Also, the index of the previous step can be made effective as it is at the time of induction hardening.

Since the second quenching station is provided with a tempering coil for tempering the shaft portion subjected to induction hardening, not only induction hardening but also tempering can be performed. It has become.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an induction hardening device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a relationship between a first high-frequency heating coil used in the induction hardening device according to the embodiment of the present invention and a cup portion of a work.

FIG. 3 is a schematic front view of a workpiece subjected to induction hardening by the induction hardening device according to the embodiment of the present invention.

FIG. 4 is a schematic explanatory diagram for explaining the operation of the induction hardening device according to the embodiment of the present invention.

FIG. 5 is a schematic explanatory view showing a case where induction hardening is performed on a groove on the inner surface of a cup portion by a conventional induction hardening apparatus of this type.

[Explanation of symbols]

 Reference Signs List 100 Indexing station 200 First quenching station 300 Second quenching station 400 Unloading station

Claims (2)

[Claims] In an induction hardening device for a workpiece having a machined shaft portion and a cup portion whose end face is not machined, an indexing station for indexing the workpiece, and an indexing station for indexing the workpiece. The first to perform induction hardening on the cup part of the indexed work
Quenching station, a second quenching station for performing induction quenching on the shaft portion of the workpiece having the cup portion subjected to induction quenching, and induction hardening at the first and second quenching stations. And a work moving mechanism for moving the work between the stations. The moving mechanism grips and moves only the shaft portion of the work, and at least moves the shaft of the work. An induction hardening device, wherein the cup portion is induction hardened at the first station while holding only the portion and the end surface is suspended in the air. 2. The high-frequency wave according to claim 1, wherein the second quenching station is provided with a tempering coil for tempering the shaft portion subjected to induction hardening. Quenching device.