JP2004169133A - High-frequency induction hardening device for constant velocity universal joint - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-frequency induction hardening device for a constant velocity universal joint whose installation space is small and facility cost is low, and can perform high-frequency hardening of a plurality of kinds of constant velocity joints. <P>SOLUTION: The high frequency induction hardening device comprises a first hardening station 10 to harden outer circumferential surfaces of stem shaft portions w11 and w21 of works W1 and W2, an indexing station 20 to index the works W2 and W3, a second hardening station 30 to harden the inner surface of a cup part w12 of the work W1 and groove parts w22 and w32 of the works W2 and W3, a third hardening station 40 to harden the inner circumferential surface of a spline hole w31 of the work W3, a conveying mechanism 50, a high frequency power source 60, a current switching unit 70, a setting and inputting unit 80, and a sequence control unit 90. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an induction hardening device for a constant velocity joint which uses a constant velocity joint of an automobile or the like as a work and performs induction hardening according to the type of the work.
[0002]
[Prior art]
2. Description of the Related Art A wide variety of constant velocity universal joints (CVJs) used as driving parts of automobiles are manufactured and developed. FIG. 8 shows a typical type. A work W1 shown in FIG. 5A is a constant velocity joint that directly drives a tire wheel and can be moved up and down, left and right (swing). A work W2 shown in FIG. 7B is a constant velocity joint that can be slid and integrated with a shaft inserted into a side gear incorporated in a differential. The work W3 shown in FIG. 9C is a constant velocity joint of the same type as that shown in FIG.
[0003]
A portion of the constant velocity joint where stress tends to concentrate is subjected to a heat treatment to enhance the strength of the portion. That is, in the case of the work W1 shown in FIG. 8A, the outer peripheral surface of the stem shaft portion w11 and the inner surface of the cup portion w12, and in the case of the work W2 shown in FIG. 8B, the outer peripheral surface of the stem shaft portion w21 and the cup portion. In the case of the groove w22 in w24 and the work W3 shown in FIG. 8C, the spline hole w31 in the head w34 and the groove w32 in the cup w33 are each induction hardened.
[0004]
When induction hardening of such a constant velocity joint is performed, it is common to use an induction hardening device for a constant velocity joint. However, since the shape of the hardened surface, the pattern of the hardened layer, the depth thereof, and the like are completely different depending on the type of the work and the hardened portion, the stem shaft portions w11 and w21, the groove portions w22 and w32, and the spline hole w31 of each work are required. A dedicated device for individually quenching is provided and used as needed (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-11-001493
[0006]
[Problems to be solved by the invention]
However, in the case of the above-described conventional example, it has been pointed out that a number of dedicated devices are required for quenching a plurality of types of constant velocity joints, which leads to a large installation space and a high facility cost. In addition, the frequency of the high-frequency current to be supplied to the heating coil at the time of induction heating differs depending on the quenching location, and accordingly, a plurality of power supplies are required. In addition, in order to improve the efficiency of the heat treatment process, a plurality of workpieces may be automatically and sequentially conveyed to each dedicated device, but at this time, induction heating may be performed simultaneously in different dedicated devices, and Accordingly, large-capacity power supply equipment is required, and the equipment cost is also increased in this respect.
[0007]
The present invention has been created in view of the above background, and although it is possible to perform induction hardening over a plurality of types of constant velocity joints, the installation space is small and the equipment cost is low for constant velocity joints. It is an object to provide an induction hardening device.
[0008]
[Means for solving the problem]
The induction hardening apparatus for a constant velocity joint according to the present invention is an apparatus that uses a constant velocity joint as a work and performs induction hardening on the work in accordance with its type. Specifically, a first quenching station for quenching the outer peripheral surface of the stem shaft portion of the work, and a second quenching station for quenching the inner surface of the cup portion of the work and / or the groove formed in the work. , A third quenching station for quenching the inner peripheral surface of the spline hole formed in the workpiece, a transport mechanism for transporting the workpiece to each station, and a variable frequency generation of high-frequency current required for induction heating of the workpiece High-frequency power supply, a high-frequency current output from the high-frequency power supply, a current switching unit for switchingly outputting a high-frequency current to a heating coil arranged in each quenching station, and a setting and inputting a type of a workpiece to be subjected to high-frequency quenching. And a sequence pattern necessary for performing induction hardening are prepared in advance for each type of work, and a work pattern set through the setting input section is provided. The first according to the sequence pattern corresponding to the type, second, third quenching station, the transport mechanism, and a sequence controller for controlling the high frequency power source and a current switching section.
[0009]
Preferably, an indexing station which is arranged between the first station and the second station and which determines the position of the work is provided. In this case, the sequence control unit is configured to control including the indexing station in accordance with the sequence pattern corresponding to the type of work set through the setting input unit.
[0010]
Preferably, the sequence pattern includes a first quenching station and a second quenching station or a second quenching station and a third quenching station in a process of sequentially carrying out quenching by transporting a plurality of workpieces. In this case, it is preferable to use a content that causes each work located in the station to be induction-heated in a time sharing manner.
[0011]
Preferably, the first quenching station includes a heating unit for inductively heating a stem shaft of the work using a heating coil, and cooling the stem shaft of the heated work, which is located on both sides of the heating unit. And a shuttle mechanism for alternately moving the work from the heating unit to the first and second cooling units, and a mechanism for sequentially moving the work to the station entrance, the heating unit, and the station exit. In addition, it is preferable to use a configuration having a handler mechanism capable of simultaneously transporting the works located at the station entrance and the heating unit to the heating unit and the station exit, respectively. In the sequence pattern in this case, when controlling the first quenching station, the handler mechanism is operated to transport the work a from the station entrance to the heating unit, and the heating unit is operated to guide the stem shaft of the work a. On the other hand, while heating, the handler mechanism is reversed to return to the initial position, and after the heating of the work a is completed, the shuttle mechanism is operated to move the work a from the heating section to the first cooling section, and the first cooling section is moved. While operating to cool the stem shaft of the work a, the handler mechanism is operated to transfer the work b from the station entrance to the heating unit. During the cooling period of the work a, the heating unit is operated to operate the stem shaft of the work b. While the part is induction-heated, the handler mechanism is reversely operated to return to the initial position, and after the cooling of the workpiece a and the heating of the workpiece b are completed, the shuttle mechanism is reversely operated. The work a is moved from the first cooling unit to the heating unit and the work b is moved from the heating unit to the second cooling unit, and the second cooling unit is operated to cool the stem shaft of the work b. By operating the mechanism, the work a is transported from the heating unit to the station outlet and the work c is transported from the station entrance to the heating unit, and the heating unit is operated to induction-heat the stem shaft of the work c. After the heating of the work c, the shuttle mechanism is operated to move the work b from the first cooling unit to the heating unit and the work c from the heating unit to the first cooling unit, and such a series of processing is repeated. Use what you do. Note that, among a plurality of works sequentially transferred using the transfer mechanism, works a, b, and c are sequentially set from the beginning.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The induction hardening apparatus for a constant velocity joint described here is an apparatus for performing induction hardening according to the type of a work W using a constant velocity joint used as a drive component of an automobile. The types of the work W that can be hardened by the present apparatus include the work W1, the work W2, and the work W3 illustrated in FIG.
[0013]
This apparatus includes a first quenching station 10, an indexing station 20, a second quenching station 30, a third quenching station 40, and a transport mechanism 50 as shown in FIGS. The high frequency power supply 60 and the current switching unit 70 as shown in FIG. 5, and the setting input unit 80 and the sequence control unit 90 as shown in FIG. Most of the first, second, and third quenching stations 10, 30, 40, the indexing station 20, the transport mechanism 50, and the current switching unit 70 are provided in the housing H1, while the setting input unit 80 is provided. Is provided in the housing H2. The high-frequency power supply 60, the sequence control unit 90, the cooling water supply unit (not shown), and the like are installed near the housings H1 and H2.
[0014]
First, details of the mechanical configuration of the present apparatus will be described below with reference to FIGS. 1 to 4 and 7. The first quenching station 10 is a device for quenching the outer peripheral surface of the stem shaft portion w11 or w21 when the work W is the work W1 or the work W2 as shown in FIGS.
[0015]
In this embodiment, a so-called semi-open saddle coil is used as the heating coil 111. The semi-open saddle type coil referred to here is made of a pipe made of copper or the like, and has a pair of linear portions arranged on the outer peripheral surface of the stem shaft portion w11 and the like at intervals along the length direction thereof. And semicircular portions respectively connected to both ends of the substantially straight portion and arranged along the circumferential direction on the outer peripheral surface of the stem shaft portion w11.
[0016]
In the first quenching station 10, induction heating is performed while rotating the work W using the heating coil 111, and then cooling is performed by spraying a cooling liquid while rotating the work W. In addition, if the plurality of works sequentially conveyed by using the conveyance mechanism 50 are represented as works a, b, and c in order from the beginning (see FIG. 7), the cooling of the work a after the induction heating is completed and the work b The induction heating is performed at the same time, and then the cooling of the work b and the induction heating of the work c are performed at the same time.
[0017]
The first quenching station 10 is specifically arranged on both sides of the heating unit 11 by induction heating the stem shaft portion w11 or w21 of the work W using the heating coil 111, and is provided on both sides of the heating unit 11. First and second cooling units 12 and 13 for cooling the stem shaft portion w11 or w21 of the heated work W, and a table 17 (FIG. 7) for supporting the work W so as to be movable and rotatable in the left-right direction in FIG. ), The stem center mechanism 14 for independently positioning the two works W placed on the table 17, and the two works W placed on the table 17 together with the stem center mechanism 14 from the heating unit 12. A shuttle mechanism 15 for alternately moving the work W to the first and second cooling units 12 and 13, and a mechanism for sequentially moving the work W to the station entrance α, the heating unit 11, and the station exit β. The configuration includes a heating mechanism 11 and a handler mechanism 16 that can simultaneously transport two works W positioned at the heating unit 11 to the heating unit 11 and the station outlet β, respectively. The detailed configuration of each component is as follows.
[0018]
The heating unit 11 is disposed at a position facing the work W conveyed from the station entrance α by the handler mechanism 16 (see FIG. 7). When performing induction heating, the heating coil 111 moves forward to approach the work W. While the work coil W is set at the heating position, the heating coil 111 moves rearward when the work W is moved by the shuttle mechanism 15 and moves away from the work W to set the coil at the retracted position. I have. The heating coil 111 is supplied with a high-frequency current of 10 KHz output from the high-frequency power supply 60.
[0019]
The first cooling unit 12 is a cooling jacket disposed on the left side of the heating unit 11 in FIG. 1, and injects a cooling liquid toward the stem shaft w11 or w21 of the work W moved from the heating unit 11 by the shuttle mechanism 15. It is supposed to. The second cooling unit 13 is a cooling jacket disposed on the right side of the heating unit 11 in FIG. 1 and is exactly the same as the first cooling unit 12.
[0020]
The stem center mechanism 14 has center shafts 141 and 142 whose respective tips enter holes w13 or w23 formed in the stem shaft portions w11 or w21 of the two works W placed on the table 17, respectively. 141 and 142 are raised and lowered independently. The table 17 is provided with a mechanism for rotating the work W.
[0021]
The shuttle mechanism 15 is a mechanism for moving the stem center mechanism 14 in the left-right direction in FIG. 1, and the position of the heating unit 11 in a state where the two works W placed on the table 17 are positioned by the stem center mechanism 14. It is designed to move left and right around the center.
[0022]
The handler mechanism 16 chucks the workpiece W at each end of the substantially L-shaped arm 161, and alternately rotates the arm 161 at 90-degree pitch intervals as shown in FIG. 7.
[0023]
The target of the work W to be induction hardened in the first quenching station 10 is the work W1 and the work W2 as described above, and the work W3 passes through the first quenching station 10 without any change. That is, when the work W3 is induction hardened, the handler mechanism 16 functions as a part of the transport mechanism 50.
[0024]
As shown in FIGS. 1 to 3, the second quenching station 30 quenches the inner surface of the cup w12 when the work W is the work W1, and the grooves w22 and w32 when the work W is the work W3. It is.
[0025]
In this embodiment, when the work W is the work W1, a so-called multi-turn coil is used as the heating coil 31. The multi-turn coil referred to here is made of a pipe made of copper or the like, is spirally wound along the inner wall of the cup portion w12, and can enter the cup portion w12. . On the other hand, when the work W is the work W2 or the work W3, a coil having the following structure is used as the heating coil 32. That is, the coil is made of a pipe made of copper or the like, and is compared with three coil portions bent along the groove portions w22 or 32 and separated by a pitch interval of 120 degrees from each other, and the cup portion w24 or 33 of the work W. The three coil portions have lead portions and the like vertically connected to both end portions of the three coil portions, respectively, and the three coil portions are spaced apart from each other by three grooves w22 or 32 at a predetermined interval. It is possible to open and enter.
[0026]
In the second quenching station 30, when the work W is the work W <b> 1, the inner surface of the cup portion w <b> 12 is guided by rotating the work W using the heating coil 31 while cooling the outer periphery thereof by spraying the cooling liquid. After heating, the cooling liquid is sprayed onto the inner surface of the cup portion w12 while rotating the work W to cool the work. On the other hand, in the case of the work W2 or the work W3, while the outer periphery thereof is cooled by spraying the cooling liquid, the heating coil 32 is used to move and heat the groove w22 or 32 of the work W, and at the same time, the heating of the groove w22 or 32 is performed. The cooling liquid is sprayed toward the portion to move and cool.
[0027]
The second quenching station 30 includes a heating coil 31 for inductively heating the inner surface of the cup w12 of the work W, a heating coil 32 for inductively heating the groove w22 or 32 of the work W, and a heating coil 31. A cooling jacket 33 that is attached and injects a cooling liquid toward the inner surface of the cup w12 of the work W; and a cooling liquid that is attached to the heating coil 32 and directed toward a heated portion of the groove w22 or 32 of the work W. , A table 35 rotatably supporting the work W, and an annular cooling jacket 36 mounted on the table 35 and spraying a coolant toward the outer periphery of the work W on the table 35 And a first quenching unit (heating coil 31 and cooling jacket 33), And a quenching unit mounting base 37 to which one of the quenching units (the heating coil 32 and the cooling juquet 34) can be removably attached, It has a cup center mechanism 38 for positioning and rotating the work W, an elevating unit 39 for elevating the table 35 and the like.
[0028]
The heating coils 31 and 32 are supplied with high-frequency currents of 10 KHz and 50 KHz output from the high-frequency power supply 60. A central portion of the table 35 is for inserting most of the first quenching unit or the second quenching unit attached to the quenching unit mounting base 37 into the cup portion w12, 33, or 33 of the work W. An opening is formed. The cup center mechanism 38 has a center shaft 381 whose front end is in contact with the front end portion of the work W on the table 35, and moves up and down the center shaft 381. The elevating unit 39 inserts the first quenching unit into the cup portion w12 of the work W1 while maintaining the table 35 at a constant height when the inner surface of the cup portion w12 of the work W1 is quenched. At the time of quenching the groove portion w22 or w32 of the work W3, the table 35 moves downward at a constant speed so that the first quenching unit is gradually inserted into the cup portion w24 or 33 of the work W1 or the work W3. Has become. When the first and second quenching units are attached to and detached from the quenching unit mounting base 37, they are also used to retract the table 35 upward (see FIG. 2).
[0029]
The indexing station 20 is disposed between the first quenching station 10 and the second quenching station 30 as shown in FIGS. 1 and 3, and has an orientation thereof when the workpiece W is the workpiece W2 or the workpiece W3. It is a device that performs indexing.
[0030]
The index station 20 is provided because the work W is placed on the table 35 of the second quenching station 30 to determine the positional relationship between the groove w22 or 32 and the coil part of the heating coil 32. In addition, the gap between the coil portion of the heating coil 32 and the groove portion w22 or 32 of the work W is made constant.
[0031]
Specifically, the indexing station 20 is a table 21 that rotatably supports the work W, and an indexing unit that is provided below the table 21 and that determines the direction of the work W placed on the table 21. 22 and a cup center mechanism 23 disposed above the table 21 and rotatably positioning the work W on the table 21. The detailed configuration of each component is as follows.
[0032]
The cup center mechanism 23 has a center shaft 231 whose front end fits into a front end portion of a work W placed on the table 21, and is configured to rotatably move the center shaft 231 up and down.
[0033]
The indexing unit 22 is provided with a roller 221 that is inserted into the cup w24 or 33 of the work W through an opening formed in the center of the table 21. The roller 221 is attached to the rod portion 2211 connected to a cylinder, a pulse motor, or the like, and the distal end portion of the rod portion 2111 in the radial direction, and has a sufficient amount to enter the groove portion W22 or 32 of the work W with a margin. And a large roller portion 2212.
[0034]
The indexing unit 22 optically detects the direction of the groove W22 or 32 of the work W placed on the table 21 using a sensor, and based on the detection result, a pulse motor, a cylinder, or the like connected to the roller 221. Is operated to raise and lower the roller 221, and finely rotate the roller 221 to adjust the rotation angle of the roller portion 2212.
[0035]
That is, the direction of the work W placed on the table 21 is detected using the sensor, and the pulse motor is operated so that the roller portion 2212 can be inserted into the groove W22 or 32 of the work W with a margin. Then, the direction of the roller portion 2212 is adjusted. In this state, the roller 221 is raised by operating the cylinder. Then, the roller portion 2212 is inserted into the groove portion W22 or 32 of the work W without contacting the work W. Then, the direction of the roller portion 2212 is gradually changed by finely operating the pulse motor. Since the roller portion 2212 contacts the wall surface of the groove W22 or 32 of the work W, the direction of the work W is adjusted according to the change in the direction of the roller portion 2212. When the fine operation of the pulse motor is stopped when the direction of the work W detected by the sensor becomes a predetermined direction, as a result, the work W placed on the table 21 is stopped. The orientation is determined.
[0036]
The third quenching station 40 is a device for quenching the inner peripheral surface of the spline hole w31 when the work W is the work W3 as shown in FIGS.
[0037]
In this embodiment, a so-called multi-turn coil is used as the heating coil 41. The multi-turn coil referred to here is made of a pipe made of copper or the like, is wound in a circular shape along the inner surface of the spline hole w31, and can enter the spline hole w31. .
[0038]
In the third quenching station 40, the inner surface of the spline hole w31 is induction-heated while rotating the work W using the heating coil 41 while cooling the outer periphery of the work W by spraying the cooling liquid. The cooling liquid is sprayed onto the inner surface of the spline hole w31 while rotating to cool the spline hole w31.
[0039]
The third quenching station 40 specifically includes a heating coil 41 for inductively heating the inner surface of the spline hole w31 of the work W, and a cooling liquid attached to the heating coil 41 and directed toward the inner surface of the spline hole w31 of the work W. , A cooling jacket 43 for injecting a cooling liquid toward the outer periphery of the work W, a table 44 for mounting and supporting the work W, and a third quenching unit (heating coil 41) And a lifting unit 45 for raising and lowering the cooling jackets 42 and 43). The heating coil 41 is supplied with a high-frequency current of 70 KHz output from a high-frequency power supply 60.
[0040]
The transfer mechanism 50 sequentially transfers the work W to the first quenching station 10, the indexing station 20, the second quenching station 30, and the third quenching station 40 as shown in FIGS. Device.
[0041]
The transport mechanism 50 specifically includes an entrance conveyor 51 for transporting the work W before quenching to the position of the station entrance α of the first quenching station 10 as shown in FIGS. Is located at the opposite position, and the outlet conveyor 53 for unloading the work W after quenching is completed, and the work W located at the station outlet β of the first quenching station 10 is located at an intermediate position γ near the indexing station 20. The workpiece W conveyed to the intermediate position γ as shown in FIG. 1 and the work W conveyed to the intermediate position γ are sequentially conveyed to the second quenching station 30, the third quenching station 40, and the exit conveyor 53 as shown in FIG. And a chuck unit 54 for performing the operation. 1 and 3, the chuck unit 54 is not shown.
[0042]
The chuck unit 54 is disposed above the first quenching station 10, the indexing station 20, the second quenching station 30, and the third quenching station 40 on the near side in FIG. 1 (see FIG. 2). , Up to four workpieces W from the intermediate position γ to the indexing station 20, from the indexing station 20 to the second quenching station 30, from the second quenching station 30 to the third quenching station 40, to the third It is possible to convey from the entrance station 40 to the exit conveyor 53 at one time. Specifically, it is as follows.
[0043]
The chuck unit 54 is located at the intermediate position γ, the indexing station 20, the second quenching station 30, the third quenching station 40 to the indexing station 20, the second quenching station 30, the third quenching station 40, and the outlet. Chucks 541a, b, c, d for gripping each work W when each of them is conveyed to the conveyor 53, up-down movement mechanisms 542a, b, c, d for vertically moving the chucks 541a-d, respectively, and up-down movement mechanism And a horizontal movement mechanism 543 for simultaneously moving 542a to 542d in the horizontal direction.
[0044]
The gripping of the work W by the chucks 541a to 541d, the upward movement of the work W by the vertical movement mechanisms 542a to 542d, the horizontal movement of the work W on the left side in FIG. 4 by the horizontal movement mechanism 543, and the downward movement of the work W by the vertical movement mechanisms 542a to 542d. The work W is conveyed as described above in a series of flows of movement and opening of the work W by the chucks 541a to 541d. Thereafter, the operation exactly opposite to the above is performed, and the chucks 541a to 541d are returned to the original positions. When such a transport stroke is repeated four times, the workpiece W located at the intermediate position γ is transported to the exit conveyor 53 through the indexing station 20, the second quenching station 30, and the third quenching station 40 sequentially. You.
[0045]
Next, details of the electrical configuration of the present apparatus will be described below with reference to FIGS. The high-frequency power supply 60 is a device that generates a high-frequency current necessary for induction heating of the work W in a frequency-variable manner as shown in FIG. Here, an inverter power supply using an IGBT (Insulated Gate Bipolar Transistor) module capable of switching and outputting a high-frequency current of 10, 50, and 70 KHz from a commercial voltage is used.
[0046]
As shown in FIG. 6, the current switching unit 70 converts the high-frequency current of 10, 50, and 70 KHz output from the high-frequency power supply 60 to the first, second, and third quenching stations 10, 30, and 40, and the heating coil This is a group of switches for switching and outputting to 111, 31 (or 32), and 41. Here, a relay switch for large current is used.
[0047]
The current switching unit 70 specifically includes switches 71a, b, and c for switching high-frequency currents of 10, 50, and 70 KHz output from the high-frequency power supply 60, and a high-frequency current of 10, 50 KHz for the type and quenching of the work W. There are switches 72a, b, and c for switching according to the location, and a total of four switches 73 for switching the capacity of the resonance capacitor C2 according to the type and quenching location of the work W when outputting a high-frequency current of 10 KHz. are doing.
[0048]
That is, when quenching the outer peripheral surfaces of the stem shaft portion w11 of the work W1 and the stem shaft portion w21 of the work W2, a high-frequency current of 10 KHz is output from the high-frequency power supply 60, and the switches 71a and 72a are turned on. Then, a high-frequency current of 10 KHz is supplied to the heating coil 111 sequentially through the resonance capacitors C1 and C2 and the transformer Tr1 for the first quenching station. In order to minimize the output impedance of the high frequency power supply 60 at this time, each switch 73 is turned on in a predetermined pattern.
[0049]
When quenching the inner surface of the cup portion w24 of the work W2, a high-frequency current of 10 KHz is output from the high-frequency power supply 60, and the switches 71a and 72b are turned on. Then, a high-frequency current of 10 KHz is supplied to the heating coil 31 through the resonance capacitors C1 and C2 and the transformer Tr2 for the second quenching station sequentially. In order to minimize the output impedance of the high frequency power supply 60 at this time, each switch 73 is turned on in a predetermined pattern.
[0050]
When quenching the groove w22 of the work W2 and the groove w32 of the work W3, a high-frequency current of 50 KHz is output from the high-frequency power supply 60, and the switches 71b and 72c are turned on. Then, a high-frequency current of 50 KHz is supplied to the heating coil 31 (or 32) sequentially through the resonance capacitor C3 and the transformer Tr2 for the second quenching station.
[0051]
When quenching the inner peripheral surface of the spline hole 31 of the work W3, a high frequency current of 70 KHz is output from the high frequency power supply 60, and the switch 71c is turned on. Then, a high-frequency current of 70 KHz is supplied to the heating coil 41 through the resonance capacitor C4 and the transformer Tr3 for the third quenching station sequentially.
[0052]
The setting input unit 80 is an input switch for setting and inputting the type of the work W to be subjected to induction hardening as shown in FIG. That is, when the type of the work W to be carried into the apparatus and subjected to induction hardening is input through the setting input unit 80, the input data is output to the sequence control unit 90 as an electric signal.
[0053]
As shown in FIG. 5, the sequence control unit 90 prepares a sequence pattern necessary for performing induction hardening for each type of the work W, and corresponds to the type of the work W set through the setting input unit 80. This device controls the first, second, and third quenching stations 10, 30, and 40, the indexing station 20, the transport mechanism 50, the high-frequency power supply 60, and the current switching unit 70 in accordance with a sequence pattern. Here, a sequencer is used, and the sequence pattern is included in a sequence program recorded in advance in its internal memory.
[0054]
The first, second, and third quenching stations 10, 30, and 40, the indexing station 20, and the transport mechanism 50 are provided with many sensors and the like for detecting the movement of each device and the transport position of the workpiece W. I have. Although not shown in FIG. 5, the detection signal of this sensor is also input to the sequence control unit 90. That is, the sequence control unit 90 advances the above-mentioned sequence pattern step by step while constantly monitoring the movement of each device and the transfer position of the work W.
[0055]
Hereinafter, the operation of the present apparatus configured as described above will be described, and the contents of the sequence pattern prepared in advance in the sequence control unit 90 will be described.
[0056]
When the work W1 is set and input through the setting input unit 80 as a type of performing the induction hardening, the sequence control unit 90 sequentially processes a sequence pattern necessary for performing the induction hardening of the work W1. The operation is performed. The first quenching unit is mounted on the quenching unit table 37 of the second quenching station 30, and the table is moved by using the elevating unit 39 so that most of the unit is exposed from the opening of the table 35. It is assumed that the height position of 35 is adjusted in advance.
[0057]
When the power switch of the present apparatus is turned on, the inlet conveyor 51 and the outlet conveyor 53 are constantly operated. In this state, when a plurality of works W1 are placed on the entrance conveyor 51 as shown in FIG. 1, the works W1 are sequentially conveyed to the station entrance α of the first quenching station 10 by the entrance conveyor 51. When the work W1 arrives at the station entrance α, the first quenching station 10 is operated. The contents of the sequence pattern at this time are as follows.
[0058]
First, the handler mechanism 16 is operated. That is, as shown in FIG. 7, the work W1 (work a) is gripped at one end of the arm 161. In this state, the arm 161 is rotated 90 degrees to release the work a. Then, the work a is transported from the station entrance α to the heating unit 11. When the work a is conveyed to the heating section 11, the stem center mechanism 14 is operated, the center shaft 141 is lowered, and the work a is positioned and rotated. When the arm 161 releases the work a, the handler mechanism 16 is immediately operated in reverse to return the arm 161 to the initial position.
[0059]
When the work a is rotated in a state where the work a is positioned by the stem shaft section 141, the heating section 11 is operated. That is, the heating coil 111 is moved so as to approach the work a, and the high-frequency power supply 60 and the current switching unit 70 are operated so that a high-frequency current of 10 KHz is supplied to the heating coil 111 in this state. Then, a high-frequency current of 10 KHz flows through the heating coil 111. After a lapse of a predetermined time from the start of heating, the high-frequency power supply 60 is stopped. As a result, the heating coil 111 uniformly heats the outer peripheral surface of the stem shaft portion w11 of the work a.
[0060]
After the heating of the work a is completed, the heating coil 111 is moved away from the work a. At this time, the shuttle mechanism 15 is operated to move the work a from the heating unit 11 to the first cooling unit 12. The movement of the work a is performed while being positioned and rotated by the center shaft 141. When the work a moves to the first cooling unit 12, the first cooling unit 12 is operated to inject cooling liquid onto the stem shaft w11 of the work a to cool it. After a predetermined time has elapsed from the start of cooling, the first cooling unit 12 is stopped and the rotation of the center shaft 141 is stopped. As a result, the outer peripheral surface of the stem shaft portion w11 of the work a is hardened uniformly over the entire circumference.
[0061]
On the other hand, when the work a moves from the heating unit 11 to the first cooling unit 12, the handler mechanism 16 is operated. That is, the work b is gripped at one end of the arm 161 and the arm 161 is rotated 90 degrees in this state to release the work b. Then, the work b is conveyed to the heating unit 11 from the station entrance α. When the work b is conveyed to the heating unit 11, the stem center mechanism 14 is operated, the center shaft 142 is lowered, and the work b is positioned and rotated. Then, when the heating unit 11 is operated during the cooling period of the work a, the outer peripheral surface of the stem shaft w11 of the work b is induction-heated just like the case of the work a. When the arm 161 releases the work b, the handler mechanism 16 is immediately operated in reverse to return the arm 161 to the initial position.
[0062]
After the cooling of the work a and the heating of the work b are completed, the shuttle mechanism 15 is operated in reverse to move the work a from the first cooling unit 12 to the heating unit 11 and the work b from the heating unit 11 to the second cooling unit 13. Move at the same time. The movement of the work b is performed while being positioned and rotated by the center shaft 142.
[0063]
When the work b moves from the heating section 11 to the second cooling section 13, the second cooling section 13 is operated to inject cooling liquid onto the stem shaft w11 of the work b to cool it. After a predetermined time has elapsed from the start of cooling, the second cooling unit 13 is stopped and the rotation of the center shaft 142 is stopped. As a result, the outer peripheral surface of the stem shaft portion w11 of the work b is hardened uniformly over the entire circumference.
[0064]
On the other hand, when the work a moves from the first cooling unit 12 to the heating unit 11, the center shaft 141 is raised and the handler mechanism 16 is operated. That is, the work a is released from the center shaft 141, the work c is gripped at one end of the arm 161 and the work a is gripped at the other end. In this state, the arm 161 is rotated by 90 degrees and the works a and c are respectively rotated. release. Then, the work a is simultaneously conveyed from the heating unit 11 to the station outlet β, and the work c is simultaneously conveyed from the station entrance α to the heating unit 11. When the arm 161 releases the workpieces a and c, the arm 161 is reversely rotated 180 degrees to return to the initial position.
[0065]
When the work c is conveyed to the heating unit 11, the stem center mechanism 14, the handler mechanism 16 and the heating unit 11 are operated in exactly the same manner as in the case of the work a. The induction heating of the outer peripheral surface of the stem shaft portion w11 is performed. After the cooling of the work b and the heating of the work c are completed, the shuttle mechanism 15 is operated to move the work b from the first cooling unit 13 to the heating unit 11 and the work c from the heating unit 11 to the first cooling unit 12. Move at the same time.
[0066]
Thereafter, the above-described series of processing is repeatedly performed. The sequence patterns having such contents are sequentially processed by the sequence control unit 90. As a result, the stem shaft portions of the workpieces a, b, c,... Sequentially loaded into the station entrance α by the first quenching station 10. The outer peripheral surface of w11 is sequentially quenched and sequentially carried out to the station exit β.
[0067]
When the quenching of the stem shaft portion w11 of the work W1 is completed by the first quenching station 10 and the work W1 is transported to the station outlet β, the intermediate conveyor 52 is operated for a predetermined time. Then, the work W1 is transported from the station exit β to the intermediate position γ. When the workpiece W1 is transported to the intermediate position γ, the chuck unit 54 is operated, and the transport stroke is performed twice in total. Then, the work W1 at the intermediate position γ is transferred to the table 35 of the second quenching station 30 via the table 21 of the indexing station 20. In this process, the indexing station 20 does not operate, and the work W1 passes through the indexing station 20.
[0068]
When the work W1 is transported to the table 35 of the second quenching station 30, the second quenching station 30 is operated. Specifically, the cup center mechanism 38 and the like are operated to lower the center shaft 381 to position and rotate the work W1. At this time, the work W1 is located at the center of the annular cooling jacket 36 on the table 35, and the first quenching unit, that is, the heating coil 31 and the cooling jacket 33 are inserted into the cup portion w12. I have.
[0069]
With the work W1 positioned and rotated by the center shaft 381 as described above, the heating coil 31 is operated for a predetermined period. That is, the high-frequency power supply 60 and the current switching unit 70 are operated so that a high-frequency current of 10 KHz is supplied to the heating coil 31. Then, a high-frequency current of 10 KHz flows through the heating coil 31. The cooling jacket 36 is operated together with the operation of the heating coil 31, and the entire outer periphery of the work W1 is cooled by spraying the cooling liquid. As a result, the inner surface of the cup portion w12 is uniformly induction-heated while the entire outer periphery of the work W1 is cooled.
[0070]
When the heating of the inner surface of the cup portion w12 of the work W1 ends, the cooling jacket 33 is operated for a predetermined period. During this period, since the cooling jacket 36 is also operating, the inner surface of the cup portion w12 is cooled by spraying the cooling liquid while the entire outer periphery of the work W1 is cooled. When the cooling jacket 33 is stopped, the cooling jacket 36 is also stopped. As a result, the inner surface of the cup portion w12 of the work W1 is uniformly hardened.
[0071]
After the operation of the second quenching station 30 is completed, that is, after quenching the inner surface of the cup portion w12 of the work W1, the chuck unit 54 is operated, and the transport stroke is performed twice in total. Then, the work W1 on the table 35 of the second quenching station 30 is conveyed to the outlet conveyor 53 via the table 44 of the third quenching station 40. In this process, the third hardening station 40 does not operate, and the workpiece W1 passes through the third hardening station 40.
[0072]
When the quenched work W1 is conveyed from the table 35 of the second quenching station 30 to the outlet conveyor 53, the work W1 is carried out by the outlet conveyor 53 because the outlet conveyor 53 is constantly operating.
[0073]
As a result of sequentially processing the sequence patterns having the above contents by the sequence control unit 90, the quenching of the plurality of works W1 is sequentially performed by the first and second quenching stations 10 and 30. However, in the process of successively quenching a plurality of workpieces W1 while carrying them, the induction heating in the first quenching station 10 and the induction heating in the second quenching station 30 are performed in a time-division manner. I have. Specifically, it is as follows.
[0074]
When performing induction heating in the first quenching station 10, a high-frequency current of 10 KHz is output from the high-frequency power supply 60, and the switches 71a and 72a need to be turned on. On the other hand, when performing induction heating in the second quenching station 10, it is necessary to output a high-frequency current of 10 KHz from the high-frequency power supply 60 and turn on the switches 71a and 72b. Induction heating in both stations is performed in a time-sharing manner by adjusting the timing of transporting the work W1 or the like so that these two processes are not performed simultaneously.
[0075]
Next, when the work W2 is set and input through the setting input unit 80 as the type of performing the induction hardening, the sequence control unit 90 sequentially processes a sequence pattern necessary for performing the induction hardening of the work W2. The following operation is performed. The second quenching unit is mounted on the quenching unit table 37 of the second quenching station 30, and the height of the table 35 is raised by using the elevating unit 39 so that the unit is not exposed through the opening of the table 35. Assume that the position is adjusted in advance.
[0076]
When the power switch of the present apparatus is turned on, the inlet conveyor 51 and the outlet conveyor 53 are constantly operated. In this state, when a plurality of works W2 are placed on the entrance conveyor 51 as shown in FIG. 1, the works W2 are sequentially conveyed to the station entrance α of the first quenching station 10 by the entrance conveyor 51. When the work W2 arrives at the station entrance α, the first quenching station 10 is operated. The contents of the sequence pattern at this time are exactly the same as those of the above-described work W1.
[0077]
When the quenching of the stem shaft portion w21 of the work W2 is completed by the first quenching station 10 and the work W2 is transported to the station outlet β, the intermediate conveyor 52 is operated for a predetermined time. Then, the work W2 is transported from the station exit β to the intermediate position γ. When the workpiece W2 is transported to the intermediate position γ, the chuck unit 54 is operated to perform one transport stroke. Then, the work W2 at the intermediate position γ is transferred to the table 21 of the indexing station 20.
[0078]
When the work W2 is transported to the table 21, the indexing station 20 is operated. That is, the cup center mechanism 23 is operated, and the center shaft 231 is lowered to position the work W2. Thereafter, the indexing unit 22 is operated to determine the direction of the work W2 on the table 21 by the above-described method, and when this is completed, the cup center mechanism 23 is operated in reverse, and the center shaft 231 is raised.
[0079]
When the operation of the indexing station 20 is completed, the chuck unit 54 is operated to perform one transfer stroke. Then, the work W2 on the table 21 is transported to the table 35 of the second quenching station 30 in the same direction.
[0080]
When the work W2 is transferred to the table 35 of the second quenching station 30, the second quenching station 30 is operated. Specifically, the cup center mechanism 38 is operated, and the center shaft 381 is lowered to position the work W2. At this time, the work W2 is located at the center of the annular cooling jacket 36 on the table 35, and the direction of the groove w22 and the positional relationship between the coil portion of the heating coil 32 are in agreement.
[0081]
With the work W2 positioned by the center shaft 381, the heating coil 31, the lifting unit 35, and the cooling jackets 33 and 36 are operated for a predetermined period.
[0082]
That is, for the heating coil 31, the high-frequency power supply 60 and the current switching unit 70 are operated so that a high-frequency current of 50 KHz is supplied to the heating coil 31. Then, a high-frequency current of 50 KHz flows through the heating coil 31. As for the lifting unit 35, the table 35 is lowered at a constant speed. Then, each coil portion of the heating coil 31 is inserted into the groove portion w22 of the work W2 from below, and then moves toward the back of the groove portion w22 at a constant speed. In this process, the groove w22 of the work W2 is moved and heated by the heating coil 31. As for the cooling jacket 36, the cooling liquid is sprayed toward the entire outer periphery of the work W2, whereby the entire outer periphery of the work W2 is cooled. With respect to the cooling jacket 33, the cooling liquid is sprayed toward the heated portion of the groove w22 of the work W2. In addition, since the heating part moves at the same time as the heating coil 31, the heated part of the groove w22 of the work W2 is moved and cooled.
[0083]
By the operation of the heating coil 31, the elevating unit 35, and the cooling jackets 33 and 36, the entire groove w22 of the work W2 is uniformly hardened in the length direction. When the quenching is completed, the cup center mechanism 38 is reversely operated, the center shaft 381 is raised, and the cup shaft 381 is retracted from the work W2.
[0084]
After the operation of the second quenching station 30 is completed, the chuck unit 54 is operated, and the transport stroke is performed twice in total. Then, the work W2 on the table 35 of the second quenching station 30 is transported to the outlet conveyor 53 via the table 44 of the third quenching station 40. In this process, the third quenching station 40 does not operate, and the work W2 passes through the third quenching station 40.
[0085]
When the quenched work W2 is conveyed from the table 35 of the second quenching station 30 to the outlet conveyor 53, the work W2 is carried out by the outlet conveyor 53 because the outlet conveyor 53 is constantly operating.
[0086]
As a result of the sequential processing of the sequence patterns having the contents described above by the sequence control unit 90, the quenching of the plurality of works W2 is sequentially performed by the first and second quenching stations 10 and 30. However, in the process of successively quenching a plurality of workpieces W2 while being transported, the induction heating at the first quenching station 10 and the induction heating at the second quenching station 30 are performed in a time sharing manner. I have. Specifically, it is as follows.
[0087]
When performing induction heating in the first quenching station 10, a high-frequency current of 10 KHz is output from the high-frequency power supply 60, and the switches 71a and 72a need to be turned on. On the other hand, when performing induction heating in the second quenching station 30, a high frequency current of 50 KHz is output from the high frequency power supply 60 and the switches 71b and 72c need to be turned on. Induction heating in both stations is performed in a time-sharing manner by adjusting the timing of transporting the work W2 or the like so that these two processes are not performed simultaneously.
[0088]
Next, when the work W3 is set and input through the setting input unit 80 as a type of performing the induction hardening, the sequence control unit 90 sequentially processes a sequence pattern necessary for performing the induction hardening of the work W3. The following operation is performed. The second quenching unit (for female type) is mounted on the quenching unit table 37 of the second quenching station 30, and the elevating unit 39 is used so that the unit is not exposed from the opening of the table 35. It is assumed that the height position of the table 35 has been adjusted in advance.
[0089]
When the power switch of the present apparatus is turned on, the inlet conveyor 51 and the outlet conveyor 53 are constantly operated. In this state, when a plurality of works W3 are placed on the entrance conveyor 51 as shown in FIG. 1, the works W3 are sequentially conveyed to the station entrance α of the first quenching station 10 by the entrance conveyor 51.
[0090]
When the work W3 arrives at the station entrance α, the handler mechanism 16 of the first quenching station 10 is operated. That is, as shown in FIG. 7, the work W3 is gripped at one end of the arm 161. In this state, the arm 161 is rotated by 180 degrees to release the work a. Then, the work W3 is transported from the station entrance α to the station exit β. In this process, the first quenching station 10 does not substantially operate except for the handler mechanism 16, and the work W3 passes through the first quenching station 10.
[0091]
When the work W3 is transported to the station exit β, the intermediate conveyor 52 is operated for a predetermined time. Then, the work W3 is transported from the station exit β to the intermediate position γ. When the workpiece W3 is transported to the intermediate position γ, the chuck unit 54 is operated to perform one transport stroke. Then, the work W3 at the intermediate position γ is transported to the table 21 of the indexing station 20.
[0092]
When the work W3 is transported to the table 21, the indexing station 20 is operated. The operation is similar to that of the work W2. When the operation of the indexing station 20 is completed, the chuck unit 54 is operated to perform one transfer stroke. Then, the work W3 on the table 21 is conveyed to the table 35 of the second quenching station 30 in the same direction.
[0093]
When the work W3 is transported to the table 35 of the second hardening station 30, the second hardening station 30 is operated. The operation is similar to that of the work W2. After the operation of the second quenching station 30 is completed, that is, after the quenching of the work W3 into the groove w32 is completed, the chuck unit 54 is operated to perform one transfer stroke. Then, the work W3 on the table 35 is transferred to the table 44 of the third quenching station 40.
[0094]
When the work W3 is transported from the table 35 to the table 44 of the third quenching station 40, the third quenching station 40 operates. Specifically, the elevating unit 45 is operated to lower the table 44. Then, the third quenching unit, that is, the heating coil 41 and the cooling jackets 42 and 43 are lowered and arranged on the table 44. The work W3 at this time is located at the center of the annular cooling jacket 43 on the table 44, and the heating coil 41 and the cooling jacket 42 are inserted into the spline hole w31.
[0095]
With the heating coil 41 and the cooling jackets 42 and 43 arranged on the table 44, the heating coil 41 is operated for a predetermined period. That is, the high-frequency power supply 60 and the current switching unit 70 are operated so that a high-frequency current of 70 KHz is supplied to the heating coil 41. Then, a high-frequency current of 70 KHz flows through the heating coil 41. The cooling jacket 43 is operated together with the operation of the heating coil 41, and the entire outer periphery of the work W3 is cooled by spraying the cooling liquid. As a result, the inner peripheral surface of the spline hole w31 is uniformly induction-heated while the entire outer peripheral surface of the work W3 is cooled.
[0096]
When the heating of the inner peripheral surface of the spline hole w31 of the work W3 is completed, the cooling jacket 42 is operated for a predetermined period. During this period, since the cooling jacket 43 is also operating, the inner peripheral surface of the spline hole w31 is also cooled by spraying the cooling liquid while the entire outer peripheral surface of the work W3 is cooled. At the same time as the cooling jacket 42 is stopped, the cooling jacket 43 is also stopped. As a result, the inner peripheral surface of the spline hole w31 of the work W3 is uniformly hardened.
[0097]
After the operation of the third quenching station 40 is completed, that is, after quenching the inner peripheral surface of the spline hole w31 of the work W3, the chuck unit 54 is operated to perform one transfer stroke. Then, the work W3 on the table 44 of the third quenching station 40 is transported to the exit conveyor 53. When the quenched work W3 is conveyed to the exit conveyor 53, the work W3 is carried out by the exit conveyor 53 because the exit conveyor 53 is constantly operating.
[0098]
As a result of the sequential processing of the sequence patterns having the contents described above by the sequence control unit 90, the quenching of the plurality of works W3 is sequentially performed by the second and third quenching stations 30 and 40. However, in the process of successively quenching a plurality of workpieces W3 while being transported, the induction heating at the second quenching station 30 and the induction heating at the third quenching station 40 are performed in a time sharing manner. I have. Specifically, it is as follows.
[0099]
When performing induction heating in the second quenching station 30, it is necessary to output a high-frequency current of 50 KHz from the high-frequency power supply 60 and turn on the switches 71b and 72c. On the other hand, when performing induction heating in the third quenching station 40, a high frequency current of 70 KHz is output from the high frequency power supply 60, and the switch 71c and the like need to be turned on. In order to prevent such two processes from being performed at the same time, the induction heating at both stations is performed in a time-sharing manner by adjusting the timing of transporting the work W3 and the like.
[0100]
In the case of the induction hardening device for a constant velocity joint configured as described above, it is possible to harden three types of works W, that is, works W1, W2, and W3, and it is not necessary to use many dedicated devices. is there. In the first quenching station 10, cooling after induction heating and induction heating before cooling are simultaneously performed on two successive workpieces that are sequentially conveyed. Since the indexing station 20 is provided, it is not necessary to align the directions of the grooves w22 and w32 of the work W2 and the work W3 when carrying the work W into the apparatus. In these respects, it is possible to improve the efficiency of the heat treatment process.
[0101]
Further, not only can one type of high-frequency power supply 60 harden the three types of workpieces W, but the induction heating at each station is performed in a time-sharing manner, so that it is only necessary to facilitate a small-capacity power supply facility. . Further, in the second quenching station 30, quenching of the cup portion w12 of the work W1 and the groove portions w22 and w32 of the work W2 and the work W3 is performed in common. In these respects, the apparatus itself is smaller than before, and the equipment cost is very low.
[0102]
In addition, the induction hardening device for a constant velocity joint of the present invention is not limited to the above embodiment, for example, a method of quenching a work performed in each station and a type of a heating coil / cooling jacket, an arrangement order of each station, The design of the transport method and the like may be changed as appropriate. In the second station, the hardening of the cup portion w12 of the work W1 and the hardening of the groove portions w22 and w32 of the work W2 and the work W3 are separated, and the first and second hardening are performed on the hardening unit mounting base 37. A unit may be mounted and the quenching unit mounting base 37 may be made movable to achieve full automation.
[0103]
【The invention's effect】
As described above, in the case of the induction hardening device for a constant velocity joint according to claim 1 of the present invention, it is possible to perform induction hardening of a plurality of types of constant velocity joints. It is not necessary to use a dedicated device, and the heat treatment process can be made more efficient. In addition, a variable-frequency power source is used as the high-frequency power source that generates the high-frequency current required for induction heating of the work, and the frequency can be changed according to the type of work and the quenching point. Unlike the case described above, it is not necessary to prepare a number of power supplies, and in this respect, the installation space can be reduced and the equipment cost can be reduced.
[0104]
In the case of the induction hardening device for a constant velocity joint according to claim 2 of the present invention, it is not necessary to align the direction of the groove of the work when carrying the work, and in this regard, the efficiency of the heat treatment process can be further improved. Will be possible. In addition, induction heating is performed under a constant gap between the groove of the work and the heating coil, and in this regard, it is possible to improve the quality of induction hardening.
[0105]
In the case of the induction hardening device for a constant velocity joint according to the third aspect of the present invention, induction heating of the work is not performed simultaneously in each station, so that a small-capacity power supply equipment is sufficient, and the equipment cost is further reduced in this regard. It becomes possible.
[0106]
In the case of the induction hardening device for a constant velocity joint according to claim 4 of the present invention, cooling after induction heating and induction heating before cooling are simultaneously performed on two successive workpieces. The time required for quenching the stem shaft portion of the work can be shortened, and the efficiency of the heat treatment process can be further improved.
[Brief description of the drawings]
FIG. 1 is a view for explaining an embodiment of the present invention, and is a partially omitted front view showing the inside of an induction hardening apparatus for a constant velocity joint.
FIG. 2 is a partially omitted side view showing a second quenching station of the apparatus.
FIG. 3 is a partially omitted plan view showing the inside of the device.
FIG. 4 is a front view showing a part of a transport mechanism of the apparatus.
FIG. 5 is an electrical configuration diagram of the device.
FIG. 6 is a circuit diagram of a high-frequency power supply and a current switching unit of the device.
FIG. 7 is a schematic top view for explaining operations of a handler mechanism and a shuttle mechanism of a first station of the apparatus.
FIG. 8 is a longitudinal sectional view of a work and a transverse sectional view of a cup portion showing typical types of constant velocity joints.
[Explanation of symbols]
10 First quenching station
20 indexing station
30 Second quenching station
40 Third quenching station
50 transport mechanism
60 High frequency power supply
70 Current switch
80 Setting input section
90 Sequence control unit
W Work

Claims (4)

An apparatus for performing induction hardening according to the type of a constant velocity joint as a work, wherein the first hardening station hardens an outer peripheral surface of a stem shaft portion of the work, an inner surface of a cup portion of the work, And / or a third quenching station for quenching the groove formed in the work, a third quenching station for quenching the inner peripheral surface of the spline hole formed in the work, and conveying the work to each station. A transfer mechanism, a high-frequency power supply that generates the high-frequency current required for induction heating of the work so that the frequency can be varied, and a high-frequency current output from the high-frequency power supply that can be switched to the heating coils arranged in each quenching station The current switching part, the setting input part for setting and inputting the type of the workpiece to be subjected to induction hardening, and the sequence pattern required for performing induction hardening are First, second, and third quenching stations, a transport mechanism, a high-frequency power supply, and a current switching unit according to a sequence pattern that is prepared in advance for each type of workpiece and that corresponds to the type of work set through the setting input unit. And a sequence control unit for controlling the inductive quenching of the constant velocity joint. 2. The induction hardening device for a constant velocity joint according to claim 1, further comprising: an indexing station arranged between the first station and the second station and for indexing a workpiece, wherein the sequence control unit sets the workpiece. An induction hardening device for a constant velocity joint, characterized in that control is performed including an indexing station in accordance with a sequence pattern corresponding to a type of a work set through an input unit. 3. The induction hardening device for a constant velocity joint according to claim 1, wherein the sequence pattern includes a first quenching station and a second quenching station in a process of transferring a plurality of workpieces and sequentially performing quenching. An induction hardening apparatus for a constant velocity joint, wherein each of the workpieces located at the second or third quenching station and the third quenching station is induction-heated in a time sharing manner. 4. The induction hardening device for a constant velocity joint according to claim 1, 2 or 3, wherein the first quenching station includes a heating unit for inductively heating a stem shaft of the work using a heating coil, and a heating unit on both sides of the heating unit. A first and a second cooling unit for cooling a stem shaft portion of a heated work, respectively; a shuttle mechanism for alternately moving the work from the heating unit to the first and second cooling units; And a handler mechanism for sequentially transferring the workpieces located at the station entrance and the heating section to the heating section and the station exit, respectively. ,
When the works a, b, and c are sequentially taken from the beginning among a plurality of works sequentially transferred using the transfer mechanism,
In controlling the first quenching station, the sequence pattern operates the handler mechanism to convey the work a from the station entrance to the heating unit, and operates the heating unit to induction-heat the stem shaft of the work a. On the other hand, the handler mechanism is reversed to return to the initial position, and after the heating of the work a is completed, the shuttle mechanism is operated to move the work a from the heating section to the first cooling section, and the first cooling section is operated. While cooling the stem shaft of the work a, the handler mechanism is operated to transfer the work b from the station entrance to the heating unit, and the heating unit is operated during the cooling period of the work a to cool the stem shaft of the work b. While the induction heating is performed, the handler mechanism is reversely operated to return to the initial position, and after the cooling of the work a and the heating of the work b are completed, the shuttle mechanism is reversely operated to perform the work. Is moved from the first cooling section to the heating section, and the work b is moved from the heating section to the second cooling section, and the second cooling section is operated to cool the stem shaft of the work b, while the handler mechanism is operated. Then, the work a is conveyed from the heating unit to the station outlet and the work c is conveyed from the station entrance to the heating unit. The heating unit is operated to induction-heat the stem shaft of the work c. After the completion of the heating, the work b is moved from the first cooling unit to the heating unit and the work c is moved from the heating unit to the first cooling unit by operating the shuttle mechanism. An induction hardening device for a constant velocity joint.

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