JPH0617117A - Turn table type induction hardening device - Google Patents

Abstract

PURPOSE:To provide a turn table type induction hardening device in which the carry-in/carry-out of a work to/from the turn table can mechanically be executed, the heat of absorption from the upper surface of the work caused by an upper concentric ring is not different to any work and further, uniform hardened layer of a pattern is formed on the lower flank and the upper flank of the work. CONSTITUTION:This induction hardening device is constituted with the horizontal turn table 2, in which three pieces of the lower concentric rings 3 provided with the constant interval at the circumference 2a goes around a carry-in/carry- out station B, quenching start station C and quenching completion station D, thereafter, returns back to the carry-in/carry-out station B, a first work holding machine 11 and a first upper concentric ring holding machine 13 connected with a vertical shaft 15 by an arm 16a, a second work holding machine 12 and a second concentric ring holding machine 14 connected with a shaft 15 by an arm 16b, an upper side concentric ring placing table 30 and a device lifting and reciprocally rotating the shaft 15 at 90 deg. angle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable type induction hardening apparatus.

[0002]

2. Description of the Related Art A spur gear will be taken as an example of a work to be quenched, and a conventional technique will be described with reference to the drawings. Figure 10
FIG. 11 is a front view of a part of a conventional turntable type high frequency heating device, and FIG. 11 is a perspective view of a part of a spur gear (hereinafter simply referred to as a gear) to be quenched. In a turntable-type induction hardening device that hardens the tooth flank 1a of the gear 1 to form a hardened layer 1f, the turntable 2 is moved up and down on the peripheral portion 2a of the horizontal turntable 2 that rotates about the shaft 2b. Circular lower outlet rings 3 that also serve as a workpiece and are fixed to the upper end of a freely penetrating rod 3a are provided at equal intervals.

Concentration is to form a hardened layer having a uniform depth on a work by contacting the work.
When the gear 1 is heated by an annular high-frequency heating coil (hereinafter, the high-frequency heating coil is also simply referred to as a heating coil) 8 without concentrating and then cooled and hardened, it is formed on the tooth surface 1a as shown in FIG. The depth of the hardened layer 1f at the root 1c is deep at both ends in the width direction of the gear 1 and shallow at the central portion. That is, the depth of the hardened layer 1f is not uniform at the tooth bottom 1c.

Therefore, the lower outlet ring 3 and the upper outlet ring 5 are brought into contact with both side surfaces 1b, 1b of the gear 1 as shown in FIGS. 10 and 11, and the heating coil 8 is used to move the tooth surface 1a of the tooth surface 1a. When quenching is performed, the hardened layer 1f having a uniform depth is formed on the tooth bottom 1c. The reason for this is that the high-frequency current that easily flows on both sides 1b, 1b near the root 1c is shunted to the lower outlet ring 3 and the upper outlet ring 5, so
Outlet ring 3 on both sides 1b, 1b near 1c,
The part that is in contact with 5 and its vicinity do not overheat, and the temperature is the same as the center part of the root 1c. Therefore, the hardened layer 1f is the root 1c
Both ends and the central part are formed with a uniform depth.

In a loading / unloading station (not shown in FIG. 10), the gear 1 to be hardened is manually placed on the lower outlet ring 3. Then, the turntable 2 is rotated by one step to move the gear 1 to the quenching start station C and stopped. And heating coil 8
Is placed from above the gear 1 so as to face the tooth surface 1a of the gear 1, and then the rod 3a is rotated by a rotating device (not shown) to rotate the gear 1 while applying a high-frequency current to the heating coil 8. Energize for a predetermined time and gear
The tooth surface 1a of 1 is heated. When heating is over, heating coil 8
The upper concentrator ring 5 is pulled up, the rod 3a is lowered, and the heated gear 1 is immersed in a quenching liquid (not shown) to quench the gear 1.

After that, the turntable 2 is further rotated one step to move the gear 1 to a quenching termination station (not shown), the rotation of the gear 1 is stopped, and the gear 1 is placed on the liquid surface of the quenching liquid. To raise. The rotation of gear 1 is
It may be stopped immediately after the rod 3a is lowered as described above. After that, the turntable 2 is further rotated by one step and returned to the carry-in / carry-out station, and the hardened gear 1 is removed from the lower outlet ring 3 by hand.

When the heating coil 8 is lowered so as to face the tooth surface 1a of the gear 1, from the support frame 9 attached to the heating coil 8 or a transformer (not shown) that supplies a high frequency current to the heating coil 8. A circular upper outlet ring 5 suspended via a spring 7 and a bearing 6
It is placed at a position facing the lower outlet ring 3 of the upper side surface 1b of the. Therefore, when gear 1 is rotating,
The upper outlet ring 5 is also in contact with the upper side surface 1b of the gear 1 while maintaining a predetermined pressure by the spring 7 while rotating. Then, when heating by the heating coil 8 is completed and the heating coil 8 is lifted, the upper outlet ring
5 rises with heating coil 8.

[0008]

However, the above turntable type induction hardening apparatus has the following problems. First, loading and unloading of gear 1 to turntable 2 is done manually. That is, since the gear 1 is manually placed on the lower outlet ring 3 and removed manually, before and after the hardening of the gear 1 is required.

Even if the lower outlet ring 3 is heated to a high temperature by the heat of the heated work and the induction of the heating coil 8, the lower outlet ring 3 is immersed in the cooling liquid, so that when the gear 1 is mounted again, the original temperature is reduced. Although there is only one upper outlet ring 5, the upper outlet ring 5 is commonly used when all gears 1 are heated. Moreover, like the lower outlet ring 3, it can be cooled by being immersed in a cooling liquid. Since the heat absorbed from the heated gear 1 gradually accumulates and rises in temperature, the heat absorption from the upper side surface 1b of the heated gear 1 differs depending on the gear 1, so that the formed hardening The pattern of layers varies depending on the gear 1.

When the gear 1 is immersed and cooled, the lower outlet ring 3 is in contact with the gear 1, but the upper outlet ring 5 is not in contact, so that the lower side surface 1b of the gear 1 is As a result of the cooling effect being different from that of the upper side surface 1b, the patterns of the hardened layers formed on the both side surfaces 1b and 1b are different from each other.

The present invention was devised in view of the above circumstances, and can mechanically carry in and carry out a work to and from a turntable, and absorb heat from the upper surface of the work by the upper outlet ring. A turntable-type induction hardening apparatus in which a hardened layer having a uniform pattern is formed on the lower side surface and the upper side surface of a work when the heated work is cooled. The purpose is to do.

[0012]

In order to solve the above problems, a turntable type induction hardening for quenching a work by bringing an upper concentrator ring and a lower concentrator ring into contact with the upper surface and the lower surface of the workpiece, respectively. The device is intermittently rotated one step at a time, and each of a plurality of lower concentric rings provided at equal intervals around the device sequentially reaches a carry-in / carry-out station, a quenching start station, and a quenching end station. A horizontal turntable that returns to the loading / unloading station again, a first work gripping machine and a first upper outlet ring gripping machine that are arranged so as to face each other around a vertical axis and are connected to the axis, and the axis. They are arranged so as to face each other in the center and are respectively arranged between the first work gripping machine and the first upper outlet ring gripping machine. The second, which is connected to the shaft with am
A workpiece gripping machine and a second concentrator gripping machine, an upper concentrator mount table on which an upper concentrator ring is mounted, which is disposed so as to face the carry-in / carry-out station around the shaft, and the shaft is lifted and lowered. An elevating and rotating device for reciprocally rotating 90 degrees is provided, and the shaft and the first
The work gripper, the second work gripper, the first upper concentrator gripper, the second upper concentrator gripper, the carry-in / carry-out station, and the upper concentrator mounting table have respective distances substantially equal to each other. .

The upper outlet ring mounting table is
A vertically movable upper outlet ring support plate, and a detection device for determining whether or not the upper outlet ring at the upper end of the upper outlet ring placed on the support plate is in a predetermined position,
It is preferable to include a device that raises or lowers the upper concentrator ring at the upper end from the predetermined position by a predetermined height according to the detection result of the detection device. An induction tempering station may be provided next to the quenching end station. Furthermore, a preheating station can be provided before the quenching initiation station.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 8 are drawings for explaining the first embodiment, FIG. 1 is a plan explanatory view, FIG. 2 is a cross sectional explanatory view taken along the line XX of FIG. 1, and FIG. FIG. 4, FIG. 4 is a front explanatory view of the upper outlet ring mounting table, FIG. 5 is a front explanatory view of the quenching start station C, and FIGS. 6 to 8 are operation explanatory diagrams. As the work, the same gear 1 as that described in the conventional technique is adopted. Then, the same components as those described in the conventional technique are designated by the same reference numerals.

As shown in FIG. 1, the turntable type induction hardening apparatus according to the first embodiment is capable of rotating the shaft by 120 degrees in one step.
2a is rotated intermittently one step at a time, and the periphery 2a
Each of the three work receiving and lower outlet rings 3 provided at equal intervals of 120 degrees in turn reaches the carry-in / carry-out station B, the quenching start station C, and the quenching end station D, and then the carry-in / carry-out again. Station B
It features a horizontal turntable 2 back to. At the quenching start station C, the gear 1 is heated and then dipped into the quenching liquid after the heating.
From the hardening station to the hardening end station D, the gear 1 moves while being immersed in the hardening liquid. When the gear 1 reaches the quenching end station D, it is raised above the level of the quenching liquid.

As shown in FIGS. 1 and 2, the turntable type induction hardening apparatus of the first embodiment also includes a gripping device 10 for gripping and moving the gear 1 and the upper outlet ring 4.
It is equipped with 0. The gripping device 100 includes a vertical shaft 15, a first work gripping machine 11 and a first work gripping device 11 which are arranged so as to face each other around the shaft 15 and are connected to the shaft 15 via a pair of arms 16a 1 and 16a 2, respectively. 1 upper concentrator gripping machine 13 and a pair of shafts 15 are arranged so as to face each other about the shaft 15 and in the middle of the first work gripping machine 11 and the first upper concentrator gripping machine 13, respectively. Arm of
The second work gripping machine 12 and the second upper outlet ring gripping machine 14 are connected to each other via 16b, 16b.

The turntable type induction hardening apparatus of this embodiment raises the gripping device 100 in the direction of the arrow R and lowers it in the direction of the arrow S opposite to the arrow R, and grips it. The apparatus 100 is provided with an elevating / rotating device 200 for rotating the device 100 about the axis 15 in the direction of arrow P by 90 degrees, and after rotating this, rotating it by 90 degrees in the direction of arrow Q, which is the opposite direction of the arrow P. .

The shaft 15, the first work gripping machine 11, the second work gripping machine 12, and the first upper outlet ring gripping machine 13
And the second upper concentrator gripper 14 are all the same, and this distance is equal to the distance between the shaft 15 and the loading / unloading station B.

As shown in FIG. 3, the first work holding machine 11
Is a pair of hands 111 arranged so as to face each other,
It has 112. Hands 111 and 112 have gear-shaped gripping portions 111a and 112a formed in a V shape at one end, and linear teeth formed in parallel at the other ends.
113 and 114, a pinion 115 that meshes with these teeth 113 and 114, and a motor that rotationally drives this pinion 115.
It is equipped with 116 and.

Therefore, when the motor 116 is rotated in the normal direction, the hands 111 and 112 can approach each other to grip the gear 1, and when the motor 116 is rotated in the reverse direction, the hands 111 and 112 are separated from each other to release the grip of the gear 1. can do. The second work gripping machine 12, the first upper concentrating gripping machine 13 and the second upper concentrating gripping machine 14 have the same structure, and have a pair of hands 121, 122, 131, 132, respectively.
And the hands 141 and 142.

Reference numeral 21 shown in FIG. 1 is a belt conveyor for carrying in the hardened gear 1 and 22 is a belt conveyor for carrying out the hardened gear 1. The belt conveyor 21 moves the gripping device 100 around the shaft 15 in the direction of the arrow Q and P
When rotated 90 degrees in the respective directions, the hands 111, 112 of the first work gripping machine 11 and the hands 141, 142 of the second upper concentrator gripping machine 14 reach the work receiving station A on the belt conveyor 21. It is arranged as follows.

The belt conveyor 22 has a shaft 15 with an arrow P.
Of the second work gripping machine 12 and the hands 131, 132 of the first upper outlet ring gripping machine 13 when the workpieces are rotated 90 degrees in the direction of Q and the direction of Q, respectively. It is arranged so as to reach the station E. The belt conveyor 21 is indicated by the arrow U.
Is intermittently moved one step at a time, and the belt conveyor 22 is intermittently moved one step at a time in the direction of arrow V.

Reference numeral 30 denotes an upper concentrator mounting table on which the upper concentrator ring 4 is mounted (hereinafter, simply referred to as a table in the description of the present embodiment).
When rotated by 90 degrees in the directions of arrows P and Q with respect to, respectively, the hands 131, 132 of the first upper concentrating gripping machine 13 and the hands 141, 142 of the second upper concentrating gripping machine 14 are It is arranged so as to extend above the table 30. That is, the distances between the axis 15, the table 30, the work receiving station A, and the work delivering station E are equal.

As shown in FIG. 4, this stand 30 has a vertical 3
More than one guide rod 31, six outer peripheral surfaces held by these guide rods 31 and six uppermost outlet rings 4 to 6 stacked in order from the bottom to the uppermost outlet ring 6 4 is placed on the outlet ring support plate 32 and screws 33 protruding from the lower surface of the support plate 32.
A worm wheel (not shown) having a female screw that is screwed to the screw 33, a worm gear (not shown) that is screwed to the worm wheel, a gear box 35 that accommodates the worm wheel and the worm gear, and an output shaft 36.
Brake motor in which a is connected to the worm gear
36, the guide rod 31, the gearbox 35 and the motor 36
And a frame 34 to which is attached. And
The worm gear, worm wheel and screw 33 are
When the brake motor 36 rotates forward and backward, the screw 33
Are coupled to rise and fall. Stand 30
In addition, an optical transmitter 37a mounted on a bracket provided near the upper end of one guide rod 31 and an optical receiver 37b mounted on a bracket provided near the upper end of another guide rod 31 are provided. Upper Concentration Detection Device Having
Equipped with 37. A proximity switch or the like may be used instead of the optical transmitter 37a and the optical receiver 37b.

As shown in FIG. 5, the lower outlet ring
3 is a rod attached to the vicinity 2a of the turntable 2 so as to vertically pass through the turntable 2.
It is fixed horizontally at the top of 3a. As described in the operation description below, the upper side surface 1b of the gear 1 has a circular upper outlet ring 4 attached to the lower outlet ring 3 before the gear 1 is placed on the lower outlet ring 3. It is placed at the opposite position. In this way, the gear 1 is in contact with the lower outlet ring 3 and the upper outlet ring 4, and at the quenching start station C, the rod 3a is moved by the annular heating coil 8 descending from the standby position.
The tooth flank 1a is heated while the rod is rotated, and then the rod
When 3a is lowered, it is immersed in a quenching liquid (not shown) and the tooth surface 1a is cooled to complete quenching.

The operation of the first embodiment will now be described with reference to FIGS. 6, 7 and 8 by taking the 0th step to the 13th step as an example. Below, 0th, 1st, 2
The third step, the third step, ..., The step S0,
Step S1, Step S2, Step S3, ...
Like. 6 (a) to 6 (f) are steps S0 to S5, and FIGS. 7 (a) to 7 (f) are steps S6 to
8 (a) and 8 (b) in step S11 are the same as step S1.
2A and 2B are operation explanatory diagrams in step S13.

In FIGS. 6, 7 and 8, and in the following description of operation, the first gear 1, the second gear 1, ... Outlet ring 4, top 2 outlet ring 4,
Are written as (1), (2) ,. In addition, the circles () and () indicate that the upper outlet ring 4 is mounted on the gear 1. Also, () is also shown on the upper side outlet ring 4
Indicates that they are stacked. As described above, the gripping device 100 is lifted and lowered by the lifting and lowering rotation device 200.
Although it is rotated, in the following description, the gripping device 100 is simply used.
Is sometimes expressed as saying that it moves up and down and rotates.

In step 0, the six upper outlet rings 4 are manually stacked on the outlet ring support plate 32 of the base 30 as shown in FIG. From top to bottom, the steps are (1), (2) to (6). The upper surface of (1) is equal to the height of the upper end of the guide rod 31. On the other hand, the belt conveyor 21 brings the work receiving station A to the next stage. Then, the first work holding machine 11, the second work holding machine 12, the first upper outlet ring holding machine 13 and the second upper outlet ring holding machine
14 are a work receiving station A, a loading / unloading station B, a work unloading station E, and a table 30, respectively.
The gripping device 100 is arranged so as to be located at. The position where the gripping device 100 is arranged in this way is determined by the gripping device.
The 100 initial position.

When the induction hardening apparatus is started, the light emitted from the optical transmitter 37a of the table 30 is received by the optical receiver 37b.
Then, the brake motor 36 of the base 30 is activated in the forward direction, the screw 33 rises, and (1) rises above the upper end of the guide rod 31 to block the light 37c from reaching the optical receiver 37b. , The brake motor 36 stops, and as shown by the dotted line in FIG.
Stop at the position where the lower surface of (1) is slightly above the upper end of the guide rod 31.

In step S1, the belt conveyor 21 advances by one step and carries to the work receiving station A.
On the other hand, the second upper concentrating gripping machine 14 grips (1) on the table 30, and then the gripping device 100 moves the lifting / lowering rotation device 200.
After ascending in the direction of arrow R by, it rotates 90 degrees in the direction of arrow P and then descends in the direction of arrow S. The position of the gripping device 100 in this state is called the transport position. And the second
When the grip of the upper concentrator gripping machine 14 is released,
(1) is placed on top. On the belt conveyor 21,
One step ahead of the work receiving station A is coming. Also, (1) is the second upper outlet ring gripping machine 14
Since it was removed from the table 30 by the above, as in the case of (1), the forward rotation operation of the brake motor 36 by the upper outlet ring detection device 37 is performed, the screw 33 rises, and (2) on the table 30. Has risen to the position shown by the dotted line in FIG.

In step S2, the gripping device 100 moves up in the direction of arrow R, rotates 90 degrees in the direction of arrow Q, and then descends in the direction of arrow S to return to the initial position. During this time, the turntable 2 rotates one step in the direction of arrow W in FIG.

In step S3, the first work gripping machine 11 grips (1) on which it is placed, and the second upper outlet ring gripping machine 14 grips (2) before gripping device.
100 moves to the transfer position, the grippers 11, 14 release the grip, and is placed on the bottom outlet ring 3 of the turntable 2 along with (1), and one step 1 is moved to the work receiving station A by the belt conveyor 21 which has moved in the direction of arrow U in FIG. And (3) is the highest on the platform 30.

In step S4, the gripping device 100 returns to the initial position. During this period, the turntable 2 rotates by one stage and stops, so that (1) reaches the quenching start station C.

At step S5, as shown in FIG. 4, after heating by the descending heating coil 8, the heating coil is
8 rises and drops and is immersed in a quenching liquid not shown. On the other hand, the first work gripping machine 11 grips the
After the upper concentrator gripping machine 14 grips (3), the gripping device 100 moves to the transfer position and is placed on the second lower concentrator ring 3 together with (2), and during this time. (3) is placed on the work receiving station A by the belt conveyor 21 which has moved one step. And (4) is the highest on platform 30.

In step S6, the gripping device 100 returns to the initial position. During this period, the turntable 2 is rotated by one step and stopped, so that (1) reaches the quenching end station D and is raised above the quenching liquid surface. And (2) reaches the quenching start station C.

In step S7, after being heated, it is lowered and immersed in the quenching liquid. On the other hand, the first work gripping machine 11 grips and the second upper outlet ring gripping machine 14
After gripping (4), gripping device 100 moves to the transfer position, and with
(4) is placed on the work receiving station A by the belt conveyor 21 which is moved one step during this period. And (5) is the highest on the platform 30.

In step S8, the gripping device 100 returns to the initial position. During this period, the turntable 2 is rotated by one step and stopped, so that (1) returns to the carry-in / carry-out station B, and (2) reaches the quenching end station D and is raised above the quenching liquid level. And (3) reaches the quenching start station C.

In step S9, after being heated, it is lowered and immersed in the quenching liquid. On the other hand, the first work gripping machine 11 grips and the second upper outlet ring gripping machine 14
Grips (5) and the second work gripping machine 12 grips, then the gripping device 100 moves to the transport position and returns to the loading / unloading station B together with (4). (5) is placed on the lowermost outlet ring 3 and is moved to the work receiving station A by the belt conveyor 21 which is moved one step during this period, and is attached together with (1). Is placed on the belt conveyor 22 of the work payout station E. And (6) is the highest on the platform 30. The upper outlet ring support plate 32 of the table 30 is raised so that (6) is in the position shown by the dotted line in FIG. 4, and the optical receiver 37b is the optical transmitter 37.
Even if it receives the light of a, it will not rise any more.

In step S10, the gripping device 100 returns to the initial position. During this period, the turntable 2 rotates by one stage and stops, so that (2) returns to the carry-in / out station B, and (3) reaches the quenching end station D and is raised above the quenching liquid level. And (4) reaches the quenching start station C.

In step S11, after being heated, it is lowered and immersed in the quenching liquid. The first work gripper 11 grips, the second upper concentrator gripper 14 grips (6), the second work gripper 12 grips, and the first upper concentrator gripper 13 ( After gripping 1), the gripping device 100 moves to the transfer position and is placed on the second lower outlet ring 3 together with (5). In (1), the upper surface is the guide rod 31. It is mounted on the concentrating support plate 32 which has risen to the upper end. During this time, the belt conveyor 21 moves one step, and the belt conveyor 22 moves one step in the direction of the arrow V shown in FIG. Then, (6) is moved to the work receiving station A by the belt conveyor 21 and is carried out one step from the work delivering station E, and (2) is placed on the belt conveyor 22 of the work delivering station E.
Placed with.

In step S12, the gripping device 100 returns to the initial position. During this period, the turntable 2 rotates one step and then stops, so (3) is the loading / unloading station B.
Then, (4) reaches the quenching end station D and is raised above the quenching liquid surface. And (5) reaches the quenching start station C.

In step S13, after being heated, it is lowered and immersed in the quenching liquid. On the other hand, the first work gripping machine 11 grips and the second upper outlet ring gripping machine 14
Grips (1), the second workpiece gripper 12 grips,
Moreover, after the first upper concentrator 13 grasps (2), the grasping device 100 moves to the transfer position and is placed on the lower concentrator 3 of No. 3 together with (6). Then, (2) is placed on the table 30. During this time, the belt conveyors 21 and 22 move one step each. Then, (1) is placed on the work conveyor station 21 when it is moved to the work receiving station A by the belt conveyor 21, and is carried out one step from the work delivering station E, while (3) is placed on the belt conveyor 22 of the work delivering station E. Placed with.

Subsequently, the above operation is repeated to obtain a large number of gears.
It is possible to mechanically load and unload the upper outlet ring 4 to and from the gear 1 and carry the gear 1 from the turntable 2 to and from the carry-in / carry-out station B without performing manual work. .

The fact that all the gears 1 to be quenched have arrived at the work receiving station A, that is, the gear 1 does not arrive at the work receiving station A thereafter, is provided in the work receiving station A, for example. When it is determined by a work detecting device and a counter (not shown), the upper outlet ring 4 placed on the table 30 is stopped from being gripped by the second upper outlet holding device 14, and the optical transmitter of the upper outlet detecting device 37 is stopped. When the reception of the light emitted from 37a by the optical receiver 37b is interrupted, the brake motor 36 is reversely activated to lower the upper outlet ring support plate 32. Therefore, the upper outlet rings 4 placed on the table 30 are sequentially stacked from the work discharge station E and descend, and finally the six upper outlet rings 4 are stacked on the upper outlet ring support plate 32. It is stored in. In this way, the upper outlet ring 4 can be stored mechanically after the gear 1 is completely quenched.

In the induction hardening apparatus of this embodiment, six upper outlet rings 4 are used, and each upper outlet ring 4 is heated by the conduction heat from the gear 1 heated at the quenching start station C. Even if the temperature rises, it is cooled until reaching the quenching end station D, and then passes through the carry-in / carry-out station B, the work discharge station E, the table 30 and the work receiving station A, and again passes through the carry-in / carry-out station B for hardening. Even when reaching the starting station C, the temperature is cooled to the original temperature by being cooled by air.

Therefore, the pattern of the hardened layer formed on each gear 1 is uniform because any upper outlet ring 4 gives the same thermal effect to the gear 1. When the gear 1 is immersed and cooled, not only the lower outlet ring 3 but also the upper outlet ring 4 is in contact with the gear 1, so that the cooling effect is the same on the lower side and the upper side of the gear 1. A hardened layer having a similar pattern is formed on the lower surface and the upper surface of the gear 1.

Next, the turntable type induction hardening apparatus of the second embodiment will be described with reference to the plan view of FIG.
The second embodiment differs from the first embodiment in the following points. That is, after the quenching end station D, the first and second
And third induction tempering stations F1, F2 and F3. Induction tempering station F
1, 1, F2 and F3 are respectively provided with annular heating coils 81, 82 and 83 which are connected in series between the power supply conductors 80a and 80b in order to temper the gear 1. The three induction tempering stations are provided in order to gradually raise the temperature for tempering the gear 1 without performing it rapidly. Except for the above, the configuration is the same as that of the first embodiment, and the operation is the same as that of the first embodiment except that the induction tempering is performed after cooling. Therefore, the same effect as the first embodiment is obtained. Exert.

In the first and second embodiments, a preheating station for the gear 1 can be provided before the quenching start station C. Even in this case, it goes without saying that the effects of the first and second embodiments can be maintained.

In the above embodiment, the case where the gear 1 is immersed and cooled has been described. However, even when the cooling is performed by jetting the cooling liquid, the effect equivalent to the effect of the above embodiment can be exhibited. Further, in the above-described embodiment, the upper concentrating detection device 37, the screw 33, and the brake motor 36 are mounted on the base 30.
I explained the case where the automatic supply of the upper outlet ring at the beginning of quenching and the automatic storage after the end of quenching are performed by setting up etc., but the table 30 is simply a table, and at the beginning of quenching, 6 upper outlets The rings 4 should be sequentially placed on this table by hand, and after quenching, return to the table 30 and manually remove or move the upper outlet ring 4 that has been placed. You can also In this case, although a small amount of manpower is required at the start and end of quenching, the quenching work is all mechanically performed, so that most of the effects of the above embodiment can be enjoyed.

[0050]

As described above, the turntable type induction hardening apparatus of the present invention is a turntable type in which the upper and lower outlet rings are respectively brought into contact with the upper surface and the lower surface of the workpiece to quench the workpiece. An induction hardening device, which is intermittently rotated one step at a time, near the periphery of a horizontal turntable that sequentially reaches a loading / unloading station, a hardening start station, and a hardening end station and then returns to the loading / unloading station again. First of all, the lower concentric rings arranged at equal intervals
The work on which the upper outlet ring is placed is sequentially placed by the work holding machine, and the quenched work is carried out together with the upper outlet ring by the second work holding machine, and the first upper outlet ring holding machine. The upper outlet ring placed on the hardened workpiece is removed, and the upper outlet ring removed by the second upper outlet ring gripper is placed on the workpiece to be quenched. Then, it is possible to mechanically supply the required number of upper concentrator rings on the upper concentrator mounting table.

Therefore, in the turntable type induction hardening apparatus of the present invention, the upper outlet ring is mechanically placed on and removed from the work, and the work is carried in and out of the turntable. It has the advantage that no manpower is required before and after quenching. Even when the upper concentrator is placed on the upper concentrator mounting table and manually recovered, the quenching work is all mechanically performed, so that the advantages similar to the above can be enjoyed.

As with the lower outlet ring, the upper outlet ring does not rise in temperature because it has a plurality of upper outlet rings and is cooled. As a result of performing a certain amount of heat absorption, the pattern of the hardened layer formed on the work does not differ depending on the work.

When the work is cooled, the lower concentrating ring and the upper concentrating ring are in contact with the lower side surface and the upper side surface of the work, respectively, so that the lower side surface and the upper side surface of the work have the same cooling effect. The patterns of the hardened layer formed on the lower side surface and the upper side surface of the work are the same.

[Brief description of drawings]

FIG. 1 is an explanatory plan view of a first embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line XX of FIG.

FIG. 3 is an explanatory plan view of the gripping machine according to the first embodiment of the present invention.

FIG. 4 is a front explanatory view of the upper outlet ring mounting table according to the first embodiment of the present invention.

FIG. 5 is a partial front view illustrating the first embodiment of the present invention.

FIG. 6 is an operation explanatory diagram of the first embodiment of the present invention,
(A) to (f) are steps S0 to S5, respectively.
Shows the operation in.

FIG. 7 is an operation explanatory diagram of the first embodiment of the present invention,
(A) to (f) are steps S6 to S11, respectively.
Shows the operation in.

FIG. 8 is an operation explanatory diagram of the first embodiment of the present invention,
(A) and (b) show steps S12 and S13, respectively.
Shows the operation in.

FIG. 9 is a plan view of the second embodiment of the present invention.

FIG. 10 is a front view of a part of a conventional turntable-type induction hardening apparatus.

FIG. 11 is a perspective view of a part of the gear.

[Explanation of symbols]

 1 Gear 2 Turntable 3 Lower outlet ring 4 Upper outlet ring 11 First workpiece gripping machine 12 Second workpiece gripping machine 13 First upper outlet ring gripping machine 14 Second upper outlet ring gripping machine 15 Shaft 30 Upper outlet ring mounting table 100 Grasping device 200 Lifting / rotating device B Loading / unloading station C Quenching start station D Quenching end station F1, F2, F3 Induction tempering station

Claims (4)

[Claims] 1. A turntable-type induction hardening apparatus for quenching a work by bringing an upper concentrator ring and a lower concentrator ring into contact with the upper surface and the lower surface of the workpiece, respectively, which are intermittently rotated one step at a time. Each of the multiple lower outlet rings provided at equal intervals around the
A horizontal turntable that sequentially reaches the carry-in / carry-out station, the quenching start station, and the quenching end station and then returns to the carry-in / carry-out station, and is arranged so as to face each other around a vertical axis and is connected to the axis. The first work gripping machine and the first upper outlet ring gripping machine are arranged so as to face each other around the axis and are respectively disposed between the first work gripping machine and the first upper outlet ring gripping machine. A second work gripping machine and a second concentrating gripping machine connected to the shaft;
Arranged to face the loading / unloading station around the shaft, an upper outlet ring mounting table on which an upper outlet ring is mounted, and an elevating / rotating device for vertically elevating and rotating the shaft 90 degrees reciprocally, The respective distances between the shaft and the first work holding machine, the second work holding machine, the first upper outlet ring holding machine, the second upper outlet ring holding machine, the loading / unloading station, and the upper outlet ring mounting table are The turntable type induction hardening device is characterized in that they are almost equal. 2. The upper outlet ring mounting base comprises a vertically movable upper outlet ring support plate, and whether or not the upper outlet ring at the upper end of the upper outlet ring placed on the support plate is in a predetermined position. 2. The turntable type induction hardening apparatus according to claim 1, further comprising: a detecting device of claim 1; and a device for raising or lowering the upper outlet ring of the upper end from the predetermined position by a predetermined height according to the detection result of the detection device. 3. The turntable type induction hardening apparatus according to claim 1, further comprising an induction tempering station next to the quenching end station. 4. The turntable type induction hardening apparatus according to claim 1, 2 or 3, further comprising a preheating station before the hardening starting station.