JPH04154908A - Coil automatic exchanging device for high-frequency quenching apparatus - Google Patents

Abstract

PURPOSE:To automatically exchange a coil in a short time and to execute quenching with high working ratio by shifting the selected coil through a supporting table, connecting a power receiving member at waiting position, and carrying and advancing the coil to the heating position of a work carried and positioned. CONSTITUTION:An outer race 1 for the work is carried in and positioned with a work- positioning rotary mechanism 18 and rotated and held. On the other hand, a desired recessed-shape coil 7 is selected with a coil selection mechanism 25 on a base table 4 and shifted to the waiting position through the coil supporting table 24. A power receiving member 8 for the prescribed coil 7 is held between a power supplying electrode 6 and a clamping member 43 with a clamping mechanism 38. Successively, the base table 4 is horizontally shifted for advancing with a shifting mechanism 20, and the coil 7 is fitted to a shaft part 2 to be quenched in the work 1. At this heating position, high-frequency current is sent to the coil 7 from a transformer 5. By this method, heat is generated to the above shaft part 2, and after the lapse of prescribed time, the current flow is stopped and the shaft part is rapidly cooled with quenching water-atomizing nozzle 10 to execute the high-frequency quenching.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an induction hardening apparatus that uses a concave coil to uniformly induction harden the peripheral portion of the shaft of a workpiece having a shaft. The present invention relates to a device that automatically exchanges coils depending on the type of workpiece.

(Prior Art) An example of a conventional induction hardening apparatus for uniformly induction hardening the peripheral portion of the shaft of a workpiece having a shaft is shown in FIG. 6.

Reference numeral 1 in the figure shows an outer race of a constant-velocity joint that integrally includes a drive shaft as a workpiece having an axial portion. The tact conveyance is carried out horizontally along a predetermined route.

The induction hardening apparatus here is equipped with a workpiece positioning rotation mechanism (not shown) which holds the outer race 1 from above and below between the center shaft 2 and positions it at the hardening position shown in the figure, and rotates it there as shown by arrow B in the figure. Also, by guidance by the guide rod 3 and urging by a hydraulic cylinder (not shown), the base 4 can be moved forward and backward from the quenching position in the horizontal direction indicated by the arrow C in the figure, which is orthogonal to the conveyance path. A transformer 5 is fixedly installed on the base 4, and a power receiving member 8, which is fixedly installed on a concave coil 7 and extends rearward from the concave coil 7, is connected to a power supply electrode 6, which is an output terminal of the transformer 5, with bolts 9. Further, quenching water spray nozzles 10 are provided on both sides of the quenching position at positions that do not interfere with the coil 7.

In such an induction hardening apparatus, when the outer race 1 is tact-transferred by the conveying device below the hardening position shown in the figure with the base 4 retracted, the workpiece positioning rotation mechanism is first rotated by the center shaft 2. Outer lace 1
is held and raised to the above-mentioned quenching position, positioned there and rotated, and then the base 4 moves forward and the concave coil 7 is fitted into the shaft of the outer race 1 and heated to a predetermined degree. Further, the transformer 5 applies a high frequency current to the coil 7 through the power supply electrode 6 and the power receiving member 8, thereby uniformly generating heat around the shaft portion of the outer race 1 by electromagnetic induction.

When the surrounding area of the shaft reaches a predetermined temperature, the transformer 5 first stops energizing the coil 7, and then the base 4
moves backward to position the coil 7 at a predetermined standby position where it is separated from the outer race 1, and the quenching water spray nozzle 10 sprays quenching water around the rotating shaft of the outer race 1, thereby spraying the quenching water around the rotating shaft of the outer race 1. As a result, the peripheral portion of the shaft portion of the outer race 1 is uniformly induction hardened, and then the workpiece positioning rotation mechanism lowers the outer race 1 to the above-mentioned transport path and delivers it to the transport device.

(Problem to be Solved by the Invention) By the way, in order to efficiently generate heat in the shaft portion of the outer race 1, it is necessary to maintain a constant gap between the shaft portion of the outer race 1 and the coil 7 nestled therein. When changing the type, it is necessary to replace the coil 7 according to the type of the outer race 1.

However, in the above-mentioned conventional induction hardening device, when performing coil setup work to replace the coil 7, first the conveying device and the induction hardening device are stopped, then the bolts 9 are removed and the coil 7 is manually removed, and then the coil 7 is manually removed. Manually install the coil 7 to be used and tighten the bolt 9.
After that, the quenching conditions are set by finely adjusting the installation position of the coil 7 so that the shaft part of the outer race 1 rises to a predetermined temperature in a certain period of time. It is necessary to perform the procedure of confirming the hardening quality of the shaft portion 1 and then fully tightening the bolt 9.

For this reason, in the conventional induction hardening equipment mentioned above, there is a problem in that it takes 60 to 120 minutes to set up the coil. This was particularly important because it significantly reduced the operating rate of the quenching equipment, which in turn significantly reduced the capacity of the quenching equipment.

Further, in the conventional induction hardening apparatus described above, since the coil setup work requires skill, there is a problem that if an inexperienced worker performs the coil setup work, the time required for the setup work is further extended.

However, the present applicant has researched an automatic coil exchange device that includes a plurality of coils and automatically exchanges them and places them in a predetermined position. Due to the limited installation space, there is a problem in that it is difficult to avoid interference between the workpiece or conveyance device and their coils, as well as interference between the workpiece positioning rotation mechanism or the quenching water spray nozzle and these coils.

Further, since a large current is passed through the coil, in the above device, there are cases where the power supply member and the electrode are welded together, making it impossible to replace the coil, and there is a problem in that replacement cannot be performed reliably.

The present invention provides an automatic coil exchange device that advantageously solves this problem.

(Means for Solving the Problems) The automatic coil changing device for an induction hardening device of the present invention has the following features:
A workpiece positioning and rotation means that holds a workpiece having a shaft portion, positions it at a predetermined hardening position, and rotates the workpiece there; and a base supporting a concave coil are horizontally moved back and forth to move the coil to the hardening position. a predetermined heating position that fits and snuggles against the shaft of the positioned work;
a base moving means for moving the base back and forth between a predetermined standby position separated from the work; a power feeding means for supplying high frequency current to the coil advanced to the heating position; and a power supply means for blowing cooling fluid to the work generated by the coil. A quick cooling means to attach the
An induction hardening apparatus comprising: a coil support base that supports a plurality of the coils in a horizontally arranged arrangement perpendicular to the forward and backward movement direction of the base; Coil selection means for horizontally moving the coil support in a retracted state and arranging any one of the coils at a use position on the base corresponding to the standby position; a plurality of coil lifting means each interposed between the plurality of coils and lifting the coils relative to the coil support;
A plurality of power receiving members are fixedly attached to the plurality of coils and extend rearward from the coils, and a plurality of power receiving members are fixedly attached to the base at a position below the power receiving members extending from the coils arranged in the use position. a power feeding electrode connected to the power feeding means; a power receiving member clamping means fixed on the base at a position above the power feeding electrode and moving a clamp member forward and backward with respect to the power feeding electrode; It is characterized by having the following.

(Function) In an induction hardening apparatus equipped with such an automatic coil exchange device, the base moving means moves the base to the retreat position, and the coil selection means moves the coil support to remove the base from the base. A power receiving member in which a predetermined one of the plurality of coils supported on the base via the coil support stand is positioned at a use position on the base corresponding to a standby position, and further a power receiving member clamping means extends from the predetermined coil. The workpiece is held between the electric electrode and the clamp member, and when the workpiece having the shaft is sent by the conveyance device, the workpiece positioning and rotation means first holds the workpiece and hardens it to a predetermined degree. Then, the base moving means moves the base horizontally forward to move the predetermined coil located at the use position, that is, the standby position on the base, from there to the shaft of the workpiece. The workpiece is moved forward to a heating position where it fits into and nestles with the workpiece, and the power feeding means applies a high frequency current to the predetermined coil through the power feeding electrode and the power receiving member, thereby uniformly generating heat around the shaft portion of the workpiece. .

When the surrounding area of the shaft reaches a predetermined temperature, the power supply means first stops energizing the coil, and then the base moving means moves the base horizontally backwards to transfer the predetermined coil to the workpiece. The rotating workpiece is moved backward to the standby position away from the workpiece, and the rapid cooling means sprays cooling fluid around the rotating shaft of the workpiece to rapidly cool the shaft, thereby cooling the shaft of the workpiece. The surrounding area is uniformly induction hardened, and then the workpiece positioning and rotation means transfers the workpiece to a conveying device.

However, in the above-mentioned automatic coil exchange device, when changing the type of workpiece, the power receiving member clamping means first moves the clamping member to the power supply electrode while the base moving means moves the base to the retracted position. The power receiving member extending from the predetermined coil and located between the clamp member and the power feeding electrode is released, and then the coil lifting means lifts the predetermined coil and the power receiving member fixed to the coil is opened. The member is separated from the power supply electrode, and the coil selection means moves the coil support to place the coil corresponding to the next workpiece type among the plurality of coils on the coil support on the base corresponding to the standby position. The power receiving member clamping means moves the clamping member forward to sandwich the power receiving member extending from the coil between the power supply electrode and the clamping member, thereby enabling power to be supplied to the coil.

Therefore, according to the automatic coil exchange device of the present invention, the coil support base is provided on the base and supports a plurality of coils in a horizontally arranged arrangement perpendicular to the forward and backward movement direction of the base. While moving it to the retreat position, move it horizontally,
Since any one of these coils is placed in the use position, multiple coils can be placed in a narrow space to avoid interference with the workpiece, conveyance device, workpiece positioning rotation means, and rapid cooling means. In addition, even if the power receiving member and power feeding electrode are welded together, the coil lifting means lifts the coil and separates the power receiving member fixed thereto from the power feeding electrode, so that the coil can be moved easily. Exchange can be carried out reliably.

According to the automatic coil changing device of the present invention, by determining the quenching conditions and confirming the quenching quality in advance when each of the plurality of coils is positioned at the predetermined heating position, the coil can be replaced based on the above effects. The above transfer device and The coil to be used next can be placed in the above usage position without stopping the induction hardening device, and
You can prepare the power supply to that coil and therefore,
- When it is necessary to produce several types of workpieces within a shift, the operating rate of the quenching equipment can be significantly increased, and the capacity of the quenching equipment can be greatly increased.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a perspective view showing an embodiment of the automatic coil changing device of the present invention together with an induction hardening device, and in the figure, parts similar to those of the conventional example are designated by the same reference numerals.

Moreover, FIGS. 2, 3, and 4 are a plan view, a front view, and a side view showing the above-mentioned induction hardening apparatus and the automatic coil exchange apparatus of this embodiment.

The induction hardening apparatus here includes a conveying device 12 on a fixed table 11, and this conveying device 12 moves two claws 14 to each other with hydraulic cylinders 13, as shown in FIG. By reciprocating the two hands 15 that are brought closer and separated together by a hydraulic cylinder 16 at a distance under the guidance of a horizontal guide rod 17, the drive shaft, which is a workpiece having a shaft portion, can be integrally assembled. An outer race 1 of a constant velocity joint having
With its axis being vertical, the outer race 1 is moved horizontally as shown by arrow A in FIG. In Figure 2, from the carry-in position at the left end to the delivery position at the center, and from the delivery position at the center to the delivery position at the right end.
Sequential tact transportation is possible.

Further, this induction hardening apparatus is provided with a workpiece positioning rotation mechanism 18 as a workpiece positioning and rotation means on the fixed base 11, and this workpiece positioning rotation mechanism 18 is equipped with a hand 15.
The upper center shaft 2 is lowered by a hydraulic cylinder (not shown) from above the outer race 1 which has been clamped by the outer race 1 and transported by the transport device 12 from the left end carry-in position to the central delivery position, and from below the outer race 1. By raising the lower center shaft 2 with the hydraulic cylinders 19, the outer race 1 is held between the center shafts 2 from above and below, and when the hand 15 releases the outer race 1, the two hydraulic cylinders By raising the upper and lower center shafts 2 together and positioning the outer race 1 at the above-mentioned hardening position as shown in FIG. 4, the upper center shaft 2 is rotationally driven by a motor (not shown). The outer lace 1 is then
The outer race 1 can be rotated as shown by the arrow B in the figure, and in the reverse procedure, the outer race 1 that has been hardened at the hardening position is lowered, delivered to the hand 15 of the conveying device 12, and then moved to the right-hand unloading position. It can be transported.

Furthermore, this induction hardening apparatus is provided with a base moving mechanism 20 as a base moving means on the fixed base 11, and this base moving mechanism 20 is fitted with a ball circulation type slider 21 fixed to the lower surface of the base 4. The base 4 is moved to the above-mentioned quenching position by the guidance of the guide rod 3 fixed on the fixed base 11 and the urging by an air cylinder (not shown) provided on the fixed base 11. In the horizontal direction (second direction) indicated by arrow C in FIG.
It can be moved forward and backward by a predetermined distance up to a predetermined forward limit position specified by a stopper bolt (in the vertical direction in the figure, and in the left-right direction in FIG. 4).

Further, this induction hardening apparatus includes a transformer 5 as a power supply means on a base 4, and a pair of power supply electrodes 6, which are output terminals of the transformer 5, are connected to a pair of current-carrying electrodes 6 passing through a cover 22 surrounding the transformer 5. It is attached to the member 23 and supported by the cover 22 in an electrically insulated state, and is fixed on the base 4.

In addition, this induction hardening apparatus is equipped with a pair of quenching water spray nozzles 10 as rapid cooling means, which are fixedly installed on a fixed base 11 via brackets (not shown) arranged so as not to interfere with the conveying device 12. The quenching water spray nozzles 10 are arranged in the conveying direction of the outer race 1 so as not to interfere with the coil 7 which has advanced to a heating position, which will be described later, and are opposed to each other with an interval between them with the quenching position in between.

However, the automatic coil exchange device of this embodiment is equipped with a coil support stand 24, and this coil support stand 24 holds three concave coils that can be properly fitted and snuggled onto the shafts of different types of outer races 1. 7 are arranged in a horizontal direction perpendicular to the forward and backward movement direction of the base 4, that is, in a direction parallel to the above-mentioned conveyance direction (in the left-right direction in FIGS. 2 and 3), and as shown in FIG. The front portion of the coil 7 having a recessed portion is supported toward the forward direction of the base 4.

And this coil automatic exchange device has its coil support stand 2.
A coil selection mechanism 25 is provided as a coil selection means for horizontally moving the base 4.
A bushing is attached to the guide rod 26 by guidance by a guide rod 26 fixed above and extending horizontally in the direction in which the three coils 7 are arranged, and by urging by a hydraulic cylinder 27 provided on the base 4. The slide member 28, on which the coil support base 24 is fixed, is reciprocated, and the slide member 28
Two stopper bolts 2 that can come into contact with both end faces respectively
9, the limit position of the reciprocating movement is adjustable and specified, and furthermore, the crank arm 31 is pushed and pulled by a hydraulic cylinder 30, and is movably fixed to a swing shaft 32 that swings, using a key and a bolt (not shown) to slide. The stopping position of the slide member 28 at the center of the guide rod 26 is adjustable by the stopper member 33, which swings between a horizontal position in which it can come into contact with one end surface of the member 28 and a vertical position in which it does not come into contact with it. .

Therefore, the coil selection mechanism 25 selects the three coils 7.
Any one of them can be placed at a predetermined use position in the center of the base 4, and this use position corresponds to a standby position, and the coil 7 placed there can be placed at a predetermined use position in the center of the base 4. The above-mentioned forward and backward movement causes the outer race 1 to be moved forward and backward between the predetermined heating position where it fits into and nestles against the shaft portion of the outer race 1 positioned at the above-mentioned quenching position and the above-mentioned standby position where it is separated from the outer race 1.

Further, the automatic coil exchange device of this embodiment includes three coil lifter mechanisms 34 as coil lifting means, each interposed between the coil support stand 24 and the three coils 7.
The coil lifter mechanism 34 includes a
A pair of power receiving members 8 that are fixedly installed at the rear of the coil 7 and extend rearward from the coil 7 to guide the vertical movement of the power receiving members 8 and electrically insulate the power receiving members 8 and the coil support 24. Guide member 35 and piston rod 36a
The coil 7 and the power receiving member 8 are fixed to the tip of the small hydraulic cylinder 36 through a base plate 37 made of an electrically insulating material. Accordingly, the coil 7 and the power receiving member 8 can be lifted with respect to the coil support base 24 while maintaining a constant orientation.

The pair of power feeding electrodes 6 are arranged below and aligned with the pair of power receiving members 8 extending rearward from the coil 7 arranged at the use position.

Further, the automatic coil exchange device of this embodiment includes a power receiving member clamping mechanism 38 as a power receiving member clamping means, which is fixed on the base 4 through the cover 22 at a position above the power feeding electrode 6, This power receiving member clamp mechanism 38
A guide sleeve 40 is attached to each of the piston rods 39a of two downward-facing hydraulic cylinders 39, and the guide sleeves 40 guide the support rod 41 in a vertically movable manner. are always urged downward, and clamp members 43 made of electrically insulating material are attached to the lower ends of these support rods 41, respectively, and the pair of clamp members 43 are moved between the pair of clamp members 43 based on the operation of the hydraulic cylinders 39. It can be moved forward and backward relative to the power supply electrode 6.

Note that a cooling water hose (not shown) is connected to a coupler 44 provided in each coil 7 and power receiving member 8 and communicating with the cooling water passage inside the coils 7 and the power receiving member 8, and each Cooling water flows through the coil 7 and the power receiving member 8.

Further, the operation of each of the above mechanisms is achieved by switching and operating an electromagnetic switching valve in a hydraulic circuit that supplies hydraulic pressure to the hydraulic cylinders of those mechanisms according to a procedure instructed in advance by a sequencer (not shown).

In the above-mentioned induction hardening apparatus, the base moving mechanism 20 moves the base 4 to the retreat position, and the coil selection mechanism 25 moves the coil support 24 to place the coil on the base 4. A power receiving member in which a predetermined one of the three coils 7 supported via the support stand 24 is located at the above-mentioned use position, that is, a standby position on the base 4, and a power receiving member clamping mechanism 38 extends from the predetermined coil. 8
is held between the power supply electrode 6 and the clamp member 43, and when the outer race 1 is conveyed to the delivery position by the conveyance device 12, the work positioning rotation mechanism 18 first rotates the outer race 1. The base moving mechanism 20 moves the base 4 forward horizontally to move the predetermined coil 7 located at the standby position from there to the outer race 1. The outer race 1 is moved forward to the above-mentioned heating position where it fits into and nestles on the shaft portion, and the transformer 5 passes a high frequency current to the predetermined coil 7 through the power supply electrode 6 and the power receiving member 8, thereby causing the outer race 1 to move forward.
to uniformly generate heat around the shaft.

When the surrounding area of the shaft reaches a predetermined temperature after a predetermined period of time, the transformer 5 first stops energizing the coil 7, and then the base moving mechanism 20 moves the base 4 backward horizontally. Then, the above-mentioned predetermined coil 7 is connected to its outer race 1.
The quenching water spray nozzle 10 is moved backward to the above-mentioned standby position away from the rotating outer race 1.
Quenching water is sprayed around the shaft portion of the outer race 1 to rapidly cool the shaft portion, thereby uniformly induction hardening is applied to the peripheral portion of the shaft portion of the outer race 1, and then the workpiece positioning rotation mechanism 20 rotates the outer race 1. is delivered to the conveyance device 12.

However, in the automatic coil exchange device of this embodiment described above, when changing the type of outer race 1, the base moving mechanism 20 moves the base 4 to the retracted position as shown in FIG. As shown, first, the power receiving member clamping mechanism 38 moves the clamping member 43 backward (up) with respect to the power feeding electrode 6, and extends from the predetermined coil 7 to clamp the clamping member 43.
The power receiving member 8 located between the power supply electrode 6 and the power supply electrode 6 is opened, and then the coil lifter mechanism 34 lifts the specified coil 7 and separates the power reception member 8 fixed to the coil 7 from the power supply electrode 6. At the same time, the remaining two coil lifter mechanisms 34 also lift the corresponding coils 7 and lift them up to the power receiving member 8.
is positioned higher than the feeding electrode 6, and the coil selection mechanism 25 moves the coil support 24 to select the next outer race l among the three coils 7 on the coil support 24.
The power receiving member clamping mechanism 38 moves the clamping member 43 forward (
By lowering the coil 7, the power receiving member 8 extending from the coil 7 is pushed down together with the coil 7 under the pressure release of the hydraulic cylinder 36 of the coil lifter mechanism 34, and the power receiving member 8 is pressed onto the power feeding electrode 6 to lower the height of the coil 7. The power receiving member 8 is held between the power feeding electrode 6 and the clamp member 43 to enable power feeding to the coil 7.

Therefore, according to the automatic coil exchange device of this embodiment, the three coils 7 are installed on the base 4 and are moved in the horizontal direction perpendicular to the forward and backward movement direction of the base 4, that is, in the direction parallel to the conveyance direction of the outer race 1. With the base 4 moved to the retracted position, the coil support 24 supported in the arranged arrangement is horizontally moved in the direction in which the coils 7 are arranged, and any one of the coils 7 is moved horizontally in the direction in which the coils 7 are arranged. Since these three coils 7 are placed in the use position, these three coils 7 can be easily connected to the outer race 1, the conveyance device 12, and even the workpiece positioning rotation mechanism 1 in a narrow space.
8 and the quenching water spray nozzle 10, and even if the power receiving member 8 and the power feeding electrode 6 are welded together, the coil lifter mechanism 34 lifts the coil 7. Since the power receiving member 8 fixed thereto is separated from the power feeding electrode 6, the coil 7 can be replaced reliably.

According to the automatic coil exchange device of this embodiment, the above effects can be achieved by determining the quenching conditions and checking the quenching quality in advance when each of the three coils 7 is positioned at the predetermined heating position. Based on this, the coil 7 can be replaced automatically and reliably in a short period of time (within a minute), and anyone can do it without requiring any skill. When changing the type of coil 7, the coil 7 to be used next can be placed in the use position without stopping the conveying device 12 and the induction hardening device, and the power supply to the coil 7 can be prepared. , therefore - if it is necessary to produce several types of outer lace 1 within a shift,
It is possible to significantly increase the operating rate of the induction hardening device and, by extension, the capacity of the induction hardening device.

Although the above has been explained based on the illustrated example, the present invention is not limited to the above-mentioned example. For example, in the above example, in response to a change in the type of outer race 1, the operator issues an operation command to the automatic coil exchange device to the sequencer. A sensor is installed in the workpiece processing line to detect the type of workpiece leaving the workpiece from its dimensions, etc., and is installed in the induction hardening device downstream of the processing line. By inputting the signal from the sensor to the automatic coil exchange device of the present invention, the coil can be automatically exchanged without any instructions from the operator, depending on the type of workpiece to be next supplied to the induction hardening device. You can do it like this.

Further, as the coil lifting means, a spring may be used instead of the hydraulic cylinder 36 in the above example.

It goes without saying that the automatic coil exchange device of the present invention can be applied not only to the outer race I of the above example, but also to other induction hardening devices for workpieces having shaft portions.

(Effects of the Invention) Thus, according to the automatic coil exchange device of the present invention, the plurality of coils can be arranged in a narrow space while avoiding interference with the workpiece, the conveyance device, the workpiece positioning rotation means, and the rapid cooling means. Moreover, even if the power receiving member and the power feeding electrode become welded together, the coil can be replaced reliably.

According to the device of the present invention, based on the above effects, the coil can be replaced automatically and reliably in a short time, and anyone can do it without requiring any skill. When changing the type of workpiece to be hardened,
A coil to be used next can be placed in the use position without stopping the conveyance device and the induction hardening device, and power supply to the coil can be prepared;
Therefore, when it is necessary to produce several types of workpieces within a shift, the operating rate of the quenching apparatus can be significantly increased, and the capacity of the quenching apparatus can therefore be significantly increased.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the automatic coil changing device of the present invention together with an induction hardening device to which the same is applied, and FIG. 2 is a plan view showing the above-mentioned induction hardening device and the automatic coil changing device of this embodiment. 3 is a front view showing the above-mentioned induction hardening device and the automatic coil changing device of this embodiment, and FIG. 4 is a side view showing the above-mentioned induction hardening device and the automatic coil changing device of this embodiment, FIG. 5 is an explanatory view showing the operating state of the automatic coil exchange device of the above embodiment, and FIG. 6 is a perspective view showing a conventional induction hardening device. ■- Outer race 4- Base 5- Transformer 6- Power supply electrode 7- Coil
8--Power receiving member 10--Quenching water spray nozzle 1B--Work positioning rotation mechanism 20--Base moving mechanism 24--Coil support stand 25
- Coil selection mechanism 34 -- Coil lifter mechanism 3
8...-Power receiving member clamp mechanism

Claims (1)

[Claims] 1. Workpiece positioning and rotation means (18) for holding a workpiece (1) having a shaft portion, positioning it at a predetermined hardening position, and rotating it there; and a base supporting a concave coil (7). The table (4) is moved horizontally back and forth to move the coil back and forth between a predetermined heating position where it fits into the shaft of the workpiece positioned at the quenching position and a predetermined standby position where it is separated from the workpiece. A base moving means (20) for moving, a power supply means (5) for supplying high frequency current to the coil advanced to the heating position, and a rapid cooling means (10) for spraying cooling fluid onto the workpiece generated by the coil. An induction hardening apparatus comprising: a coil support base (24) that supports a plurality of the coils in a horizontally arranged arrangement perpendicular to the forward and backward movement direction of the base;
and, horizontally moving the coil support stand provided on the base in a retracted state of the base, and moving any one of the coils to a position on the base corresponding to the standby position. a coil selection means (25) disposed at a use position; and a plurality of coil lifting means (34) interposed between the coil support stand and the plurality of coils to lift the coils relative to the coil support stand. ), a plurality of power receiving members (8) fixedly attached to each of the plurality of coils and extending rearward from the plurality of coils, and a plurality of power receiving members (8) at a position below the power receiving member extending from the coil arranged in the use position. A power supply electrode (6) is fixed on a base and connected to the power supply means, and a clamp member is fixed on the base at a position above the power supply electrode and is connected to the power supply means. An automatic coil exchange device for an induction hardening device, characterized in that a power receiving member clamping means (38) for moving forward and backward is provided.