JPH0450Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an apparatus for subjecting workpieces to induction hardening, particularly high frequency bright hardening or high frequency non-oxidation hardening.

<Conventional technology> Conventionally, as an induction hardening device,
- The one described in Publication No. 47644 is known (No. 4
(See Figure 5).

This high-frequency bright hardening device uses a casing 1 with an open bottom for cooling refrigerant (hereinafter referred to as cooling liquid L).
00 is immersed and held, the top of the casing 100 is covered with a cap 110, and the casing 10 is
The inside of the casing 100 is isolated from the outside air, and a workpiece holding rod 120 that can be raised and lowered is installed inside the casing 100, and the workpiece (hereinafter referred to as work W) is held by this holding rod, and An inductor 130 is provided inside or outside the casing 100 to surround the workpiece W, and a gas introduction section 140 for introducing non-oxidizing or reducing gas into the casing 100 and its gas discharge section 1 are provided.
50, respectively.

In the above-mentioned high-frequency bright hardening apparatus, a method of holding the workpiece W in the workpiece holding rod 120 and installing the workpiece W inside the casing 100 is to remove the cap 110 from the casing 100 and place the workpiece W on the workpiece holding rod 120. How to hold the workpiece W in the holding rod 120 (see Figure 4) and how to hold the workpiece W from the beginning.
is held by the workpiece holding rod 120, and the workpiece holding rod 120 is moved along arrows A to G shown in FIG. Two methods (see FIG. 5) are shown: a method in which the workpiece W is placed inside the casing 100 by being submerged in the cooling liquid L;

<Problem to be solved by the invention> However, when trying to install a workpiece inside the casing using the former method, the cap is removed from the casing each time, the workpiece is held in the workpiece holding rod, and then the cap is replaced again. Because it is attached to the casing, it is very time-consuming and difficult to use in mass production.

Furthermore, in the latter method, it is possible to continuously apply high-frequency heating to the workpiece, but since the workpiece must be moved as shown by arrows A to G, there is a lot of unnecessary movement of the workpiece, and a large number of It is not suitable for mass production of workpieces.

The present invention was devised in view of the above circumstances, and an object of the present invention is to provide an induction hardening apparatus that is suitable for mass production and is capable of performing non-oxidation hardening or bright hardening.

<Means for Solving the Problems> In order to solve the above problems, the induction hardening apparatus of the present invention includes a turntable on which a plurality of workpiece receivers for placing workpieces are provided at equal intervals around the upper surface, and a workpiece receiver. A workpiece rotation means for rotating the workpiece by rotating the workpiece, a workpiece revolution means for rotating the workpiece by rotating the turntable in steps, a cooling liquid tank with the turntable inside and containing a cooling liquid, and a workpiece receiver. A workpiece elevating means for raising and lowering the workpiece above and below the coolant surface, and an auxiliary chamber with an open bottom and a preparatory chamber provided in the path of the workpiece revolving on the coolant surface so that the lower part thereof is immersed in the coolant. A heating chamber with an open bottom that is connected in a row, an entrance door of the preliminary chamber and an exit door leading to the heating chamber provided in each of the paths, a heating coil provided in the heating chamber to heat the workpiece, the preliminary chamber and the heating chamber. and a means for filling the workpiece with a non-oxidizing or reducing gas, and the workpiece placed on the workpiece receptacle revolves and passes through the preliminary chamber, is heated in the heating chamber, and then falls below the surface of the cooling liquid. Furthermore, it is quenched while revolving within the coolant.

<Operation> The workpiece receiver rises above the coolant level in front of the entrance door of the preliminary chamber, and the workpiece is placed thereon. The work receiver is
After the entrance door to the auxiliary room opens, enter the auxiliary room and orbit around the auxiliary room. During this time, the atmosphere in the preliminary chamber and heating chamber is replaced with a non-oxidizing or reducing gas.
Next, the exit door of the pre-chamber opens and the workpiece enters the heating chamber, where it is heated by a heating coil, descends below the surface of the cooling liquid, and is hardened as it revolves below the surface of the coolant. The workpiece rises above the surface of the cooling liquid, is removed from the workpiece receiver, and is replaced with an unhardened workpiece.

<Example> Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the induction hardening apparatus according to the present invention, FIG. 2 is a front view, and FIG. 3 is an explanatory view of hardening a workpiece using the induction hardening apparatus of the present embodiment.

This induction hardening device has four
Workpiece receivers 411 to 414 (hereinafter referred to as workpiece receivers 41 when these workpiece receivers 411 to 414 are collectively referred to) are arranged at equal intervals around the top surface. The turntable 42 and workpiece receiver 411 provided in
~ When 414 is in the specified position, the workpiece receiver 4
Rotate each of 11 to 414 to place the workpiece receiver 4.
Workpiece rotation means 451, 452, 453 that rotates the workpieces placed on the turntables 11 to 414; a workpiece revolution means 460 that rotates the workpiece W by rotating the turntable 42 in steps of 45 degrees; A cooling liquid tank 31 containing a cooling liquid L with a liquid level above, and work receivers 411 to 4
14 is at the predetermined position, the workpiece receiver 411
~ 414 to raise and lower the workpiece above and below the liquid level of the coolant L, and a workpiece lifting means that raises and lowers the workpiece above and below the liquid level of the coolant L, and a workpiece W that revolves above the liquid level of the coolant L so that its lower part is immersed in the coolant L. A preliminary chamber 10 with an open bottom provided in the auxiliary chamber 10, a heating chamber 20 with an open bottom connected to the preliminary chamber 10, and an entrance door _V1 of the preliminary chamber 10 and an exit door leading to the heating chamber 20 provided in the respective paths.
V ₂ , a heating coil 22 provided in the heating chamber 20 to heat the workpiece W, the preliminary chamber 10 and the heating chamber 2
It is equipped with a gas supply means 50 for filling the 0 with non-oxidizing or reducing gas.

The workpiece revolution means 460 for rotating the turntable 42 described above is a so-called Geneva mechanism 461.
and a motor 462 that drives this Geneva mechanism.

As shown in FIG. 2, a rod 40 is provided integrally with the workpiece receiver 411 at the bottom of the workpiece receiver 411.
1, and this rod 401 has a turntable 4.
2 so as to be rotatable and vertically movable, and supported by a turntable 42. Rod 40
1 has a gear 402 attached to it. Similar rods 401 are used for the other work receivers 412 to 414.
and a gear 402 are attached.

The workpiece lifting means has a first cylinder 43 that raises the rod 401 and a workpiece receiver inside the heating chamber 20 in order to raise the workpiece receivers 411 to 414 from the liquid level of the cooling liquid L immediately before the preliminary chamber 10. 411 to 414 are raised above the liquid level of the coolant L and further to the position of the heating coil 22, and the coolant L is again raised to the position of the heating coil 22.
The second cylinder 44 is connected to the lower part of the rod 401 so as to be able to move toward and away from the lower part of the rod 401 in order to lower it below the liquid level.

The workpiece rotation means 451 rotates (rotates) the workpiece W carried into the heating chamber 20 during heating in order to uniformly heat the workpiece W and increase heating efficiency.
Reference numerals 52 and 453 rotate (rotate) the workpiece W during cooling in order to uniformly cool the workpiece W and increase cooling efficiency. Workpiece rotation means 451, 452, and 453 are installed along the edge of the turntable 42. The work rotation means 451, 452, and 453 are equipped with a gear 403 that meshes with a gear 402 provided on each rod 401 of the work receivers 411 to 414, and a motor 404 with the gear 403 attached to an output shaft. .

A gas supply means 50 for supplying gas is connected to the preliminary chamber 10 and the heating chamber 20, and gas discharge ports 51 and 52 for discharging the gas supplied by the gas supply means 50 are provided as preliminary gas supply means 50. It is provided in the ceiling between the chamber 10 and the heating chamber 20.

The heating coil 22 provided in the heating chamber 20 corresponds to the workpiece W to be hardened, and is, for example, a surrounding type heating coil. This heating coil 22 is supplied with a high frequency current from a current transformer 23.

Next, the operation of the induction hardening apparatus according to the present invention will be explained. In addition, in the drawings below in Figure 3b,
The gas supply means 50, heating coil 22, etc. are omitted. In addition, the numbers 0 to 360 written at the top of each figure indicate the locations sequentially rotated by 45 degrees in the direction of arrow A, starting from the location where the workpiece receiver 411 is located in FIG. 1 as 0 degrees. be.

When the workpiece W ₁ is placed on the workpiece receiver 411 just before (0°) the preliminary chamber 10, in this case, the workpiece receivers 412, 413, and 414 do not carry the workpiece W, and the workpiece receiver 414 is placed in the preliminary chamber. 10 (90°), the workpiece receiver 413 is located directly below the heating chamber 20 (180°) in the coolant L, and the workpiece receiver 412 is located in the coolant L (270°).
(see figure a).

Open the entrance door V ₁ and turn the turntable 42
is rotated 45 degrees in the direction of arrow A, the workpiece W ₁ is carried into the preliminary chamber 10 (45 degrees), and then the entrance door V ₁ is returned to the closed state. At this time, the workpiece receiver 414 is located just in front of the exit door _V2 (135°). Furthermore, the work receivers 413 and 412 are placed in the cooling liquid L (at 225°).
315°) (see Figure 3b).
Further, the atmosphere that has entered the preliminary chamber 10 when the entrance door _V1 is open is discharged outside due to the inflow of atmospheric gas by the gas supply means 50.

With exit door V ₂ open, turntable 4
2 by 45 degrees, and place the workpiece receiver 414 into the heating chamber 2.
0 inside (180°). After that, the exit door _V2 is returned to the closed state. This workpiece receiver 414 is raised to the position of the heating coil 22 by the second cylinder 44 . However, this work receiver 414
Since no workpiece W is placed on the heating coil 22, no high-frequency current is supplied to the heating coil 22, and the heating coil 22 is immediately lowered by the second cylinder 44 and submerged in the cooling liquid L (see arrow B). In addition, in this state, the workpiece W ₂ is placed in the workpiece receiver 412 because the workpiece receiver 412 is positioned (0°) just in front of the entrance door V ₁ .
(See Figure 3c).

With entrance door _V1 open, turntable 4
Rotate 2 by 45 degrees and move the workpiece receiver 412 to the preliminary chamber 1.
0 inside (45°). At this time, work W ₁
The workpiece receiver 411 on which the workpiece W is placed is located just before the exit door _V2 (135°), and the workpiece receivers 414 and 413 on which the workpiece W is not placed are in the cooling liquid L (Fig. 3d). reference).

Open the exit door V ₂ and turn the turntable 42
After rotating the workpiece W ₁ by 45° and carrying the workpiece receiver 411 on which the workpiece W 1 is placed into the heating chamber 20 (180°), the exit door V ₂ is closed. Then, this workpiece receiver 411 is heated by the heating coil 2 by the second cylinder 44.
The workpiece W1 is raised to the position No. 2, a high frequency current is supplied to the heating coil 22, and the workpiece _W1 is heated.
The heated workpiece _W1 is lowered by the second cylinder 44, immersed in the cooling liquid L, and cooled (see arrow C). In this state, the workpiece receiver 413 is located just before the entrance door V ₁ (0°), and the workpiece receiver 413 is located in front of the first cylinder 43
The workpiece W 3 is lifted up by the cooling liquid L into the outside air, and the workpiece W ₃ is placed on the workpiece receiver 413 (see FIG. 3e).

The workpiece receiver 413 on which the workpiece W ₃ is placed is
When the entrance door _V1 is in the open state, it is carried into the preliminary room 10 (45°). Thereafter, the entrance door _V1 is closed again. In this state, the workpiece receiver 411 on which the workpiece W ₁ is placed is in the cooling liquid L, and the workpiece
The workpiece receiver 412 on which W ₂ is placed is located just in front (135°) of the exit door V ₂ (see FIG. 3 f).

With the exit door V ₂ open, the work receiver 412 on which the work W ₂ is placed is carried into the heating chamber 20 (180°), and the work W ₂ is heated and cooled in the same manner as the work W ₁ . (see arrow C). In this state, the workpiece receiver 414 on which no workpiece W is placed is located just before the entrance door _V1 (0°), and the cooling liquid L
The workpiece W ₄ is placed on this workpiece receiver 414 since it is protruding from the inside (see Fig. 3g).

Next, the entrance door V ₁ is opened, the work receiver 414 with the work W ₄ placed thereon is carried into the preliminary chamber 10 (45°), and the entrance door V ₁ is returned to the closed state. In this case, the workpiece receiver 413 on which the workpiece W ₃ is placed is located just before the exit door V ₂ (135°), and the workpiece
The workpiece receiver 412 on which W ₂ is placed is in the cooling liquid L, and the workpiece receiver 411 on which the workpiece W ₁ is placed is placed in the cooling liquid L by the first cylinder 43 just before the entrance door V ₁ (0°). (see Figure 3h).

From here, when the turntable 42 is further rotated by 45 degrees, the workpiece receiver 4 on which the workpiece W ₁ is placed
11 is taken out from the coolant L by the first cylinder 43 just before the inlet door _V1 . The workpiece _W1 that has been hardened is removed from the workpiece receiver 411 by a mechanism not shown, and a new workpiece W, the workpiece _W5 , is placed thereon. Thereafter, the workpieces W are successively hardened in the same manner as described above.

The induction hardening apparatus of this embodiment operates as described above, and the inlet door V ₁ operates before and after the workpiece W enters the preliminary chamber 10, and the exit door _V2 operates before and after the workpiece W enters the heating chamber 20. Therefore, the sequence is such that the entrance door V ₁ and the exit door V ₂ do not operate at the same time.
Note that during work, gas is introduced into both the preliminary chamber 10 and the heating chamber 20 by the gas supply means 50, so that the atmosphere that enters when the workpiece W is put into the preliminary chamber 10 is absorbed by the inflow gas. Therefore, the air can be replaced, and no air will be mixed into the heating chamber 20.

Further, at the 180°, 225°, and 270° positions, the gears 402 provided on the rods 401 of the workpiece receivers 411 to 414 have workpiece rotation means 451 and 45, respectively.
2,453 gears 403 are in mesh with each other, and the workpiece W is constantly rotating at these positions.

<Effects of the invention> According to the induction hardening apparatus according to the invention, the preliminary chamber is connected to the heating chamber, a door is provided between the preliminary chamber and the heating chamber, and the door is opened to transfer the workpiece from the preliminary chamber to the heating chamber. Since it is moved, it is possible to eliminate the trouble and effort of having to open the cap of the casing each time the work is carried into the casing (heating chamber) in the first conventional example, so it is suitable for mass production.

In addition, in the induction hardening apparatus of the present invention, the movement of the work is from arrow A to arrow A of the work in the conventional second example.
Compared to the movement shown in G, the frequency of movement is lower, and the loading and unloading of the workpiece into and out of the preparation room, heating chamber, etc., heating, cooling, rotation, etc. are performed automatically and continuously. Also, the induction hardening apparatus of the present invention can perform induction hardening on many workpieces without much effort. In other words, mass production becomes possible.

Furthermore, since the entrance door and the exit door of the pre-chamber are not opened and closed at the same time, the atmosphere entering the pre-chamber can be easily replaced with non-oxidizing or reducing gas. Further, there is no air intrusion into the heating chamber. Therefore, only a small amount of gas is needed.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an induction hardening apparatus according to an embodiment of the present invention, Fig. 2 is a front view, and Fig. 3 is an explanatory diagram when a workpiece is hardened using the induction hardening apparatus of this embodiment. It is. 4 and 5 are schematic illustrations of a conventional induction hardening apparatus. 10... Preparation room, 20... Heating chamber, 22... Heating coil, 22... Heating coil, 30... Cooling tank, 451, 452, 453... Work rotation means, 42... Turntable, 43, 44 ...Cylinder, 411-414...Work receiver, 50...
…Gas supply means, L…Cooling liquid, V ₁ …Inlet door,
V ₂ ...exit door, W...work.

Claims (1)

[Scope of utility model registration request] A turntable has a plurality of workpiece receivers arranged at equal intervals around the upper surface on which workpieces are placed, a workpiece rotation means that rotates the workpiece receivers to rotate the workpiece, and rotates the turntable in steps to make the workpiece revolve. A workpiece revolution means, a cooling liquid tank with a turntable inside and containing a cooling liquid, a work lifting means for raising and lowering a workpiece receiver to raise and lower the workpiece above and below the cooling liquid level, and a workpiece that revolves on the cooling liquid surface. an auxiliary chamber with an open bottom and a heating chamber with an open bottom connected to the auxiliary chamber, the lower part of which is immersed in the cooling liquid, and an entrance door of each of the auxiliary chambers provided in each of the paths, leading to the heating chamber. It is equipped with an exit door, a heating coil provided in the heating chamber for heating the workpiece, and a means for filling the preliminary chamber and the heating chamber with a non-oxidizing or reducing gas, and is placed on the workpiece receiver. An induction hardening device characterized in that a workpiece revolves, passes through a preliminary chamber, is heated in a heating chamber, descends below the surface of a cooling liquid, and further revolves within the cooling liquid to be hardened.