JP2872944B2 - Magnetic substance residue removal mechanism in induction hardening equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic substance removing mechanism in an induction hardening apparatus for removing magnetic substance residues contained in a cooling liquid for cooling a work.

[0002]

2. Description of the Related Art A cooling liquid sprayed from a cooling jacket onto a work heated by a high frequency heating coil to cool the work contains fine magnetic substance residues. Such a magnetic substance residue is sludge or the like separated from the surface of the work at the time of cooling. Since the cooling liquid is repeatedly sprayed onto the work, if the magnetic substance residue remains in the cooling liquid, the cooling jacket may be clogged. When such clogging occurs, the induction hardening operation is interrupted, and the cooling jacket needs to be replaced or cleaned.

In order to avoid such a situation, the conventional induction hardening apparatus is provided with a magnetic substance residue removing mechanism for removing magnetic substance residues contained in the coolant. Such a magnetic substance residue removing mechanism is a permanent magnet submerged in a recovery groove for guiding a cooling liquid flowing out of a storage tank for storing a cooling liquid for cooling a work to a satellite tank.

[0004] That is, the magnetic substance residue contained in the coolant flowing through the recovery groove is adsorbed by the permanent magnet, thereby removing the magnetic substance residue from the coolant.

[0005]

However, the magnetic substance residue removing mechanism in the conventional induction hardening apparatus as described above has the following problems. That is, when the permanent magnet adsorbs the magnetic substance residue, the cross-sectional area of the recovery groove in the portion where the permanent magnet is provided becomes small, so that it becomes difficult for the coolant to flow. For this reason, it is necessary to periodically remove the permanent magnet from the recovery groove and remove the magnetic substance residue from the permanent magnet. Such an operation is troublesome because the magnetic substance residue is directly attracted to the permanent magnet.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can remove a magnetic substance residue contained in a coolant which causes clogging of a cooling jacket, and removes the removed magnetic substance residue. It is an object of the present invention to provide a magnetic substance residue removing mechanism in an induction hardening device that is easy to operate.

[0007]

According to a first aspect of the present invention, there is provided an induction hardening device, comprising: a storage tank for storing a cooling liquid for cooling a work; and a recovery tank for recovering the cooling liquid from the storage tank. It has a leading portion leading out to the path and a magnet provided in the leading portion, the leading portion is formed in a wide thin gutter shape, and the magnet is provided across the width direction of the leading portion. ing.

In the magnetic hardening device according to the second aspect of the present invention, the magnet is an electromagnet, and is housed in a recess provided across the width direction of the lead-out portion. Is flush with a portion other than the concave portion of the lead-out portion.

Furthermore, in the magnetic substance residue removing mechanism in the induction hardening apparatus according to the third aspect, the magnet is a permanent magnet, and is provided on the back side of the lead-out portion made of a magnetic substance.

[0010]

FIG. 1 is a schematic sectional view showing an embodiment of a magnetic substance residue removing mechanism in an induction hardening apparatus according to the present invention. FIG. 2 is a magnetic substance residue in the induction hardening apparatus according to the present invention. FIG. 3 is a schematic side view of a storage tank used for a removing mechanism, FIG. 3 is a schematic perspective view of a lead-out section used for a magnetic substance removing mechanism in the induction hardening apparatus, and FIG. 4 is another embodiment of the present invention. FIG. 5 is a schematic configuration diagram of an induction hardening device using a magnetic substance residue removing mechanism in the induction hardening device of the present invention.

The magnetic substance residue removing mechanism in the induction hardening apparatus according to this embodiment includes three storage tanks 220A to 220C for storing a cooling liquid L that has cooled the work W,
Lead-out units 500A-500C for leading the coolant L from the storage tanks 220A-220C to an external recovery path 400
And electromagnets 600A to 600C, which are magnets provided in the deriving units 500A to 500C,
The lead portions 500A to 500C are formed in a wide thin gutter shape, and the electromagnets 600A to 600C are connected to the lead portions 50A to 500C.
It is provided across the width direction of 0A to 500C.

First, a description will be given of an induction hardening apparatus to which a magnetic substance residue removing mechanism is applied in the induction hardening apparatus with reference to FIG. The induction hardening apparatus includes a plurality (three in the drawing) of heating stations 100A to 100C for heating a workpiece W,
A cooling mechanism 200 that injects and cools the cooling liquid L onto the work W heated at A to 100C, a satellite tank 300 that supplies the cooling liquid L to the cooling mechanism 200, and a cooling liquid that is sprayed on the work W L to satellite tank 3 again
And a collection path 400 for returning to 00.

The heating stations 100A to 100C
Are configured corresponding to the work W to be quenched, a work support portion (not shown) for supporting the work W, and high-frequency heating coils 110A to 110C for heating the work W supported by the work support portion. And this high-frequency heating coil 1
It has a high-frequency power supply 120 for supplying a high-frequency current to 10A, and a carry-in / out section (not shown) for carrying in / out the work W before heating to / from the work supporting section.

The work support portion has, for example, a pair of work supports for holding the end face of the work W, and a moving mechanism for moving the work support. The work supporting portion is appropriately selected according to the shape of the work W to be subjected to induction hardening.

The high-frequency heating coils 110A to 110A-1
10C is a type according to the shape of the work W to be heated,
For example, a line coil or a multi-turn coil is appropriately selected and used. The high-frequency heating coil 110A
110C is provided with a cooling mechanism (not shown) in which a cooling liquid is circulated for the purpose of cooling itself.

On the other hand, the satellite tank 300 stores the cooling liquid L supplied to each of the cooling jackets 210A to 210C of the cooling mechanism 200, and is installed at a position higher than the heating stations 100A to 100C. . That is, the coolant L is discharged from the satellite tank 300 using the potential energy to the cooling jacket 210A.
~ 210C.

The cooling mechanism 200 applies a cooling liquid L to the work W heated by each of the high-frequency heating coils 110A to 110C.
Cooling jackets 210A to 210C for injecting the cooling liquid L to the work W;
The cooling liquid L from the cooling jackets 210A to 210C
Storage tanks 220A to 220C for storing cooling water and cooling jackets 210A to 21A from the satellite tank 300.
A pipe 230 for guiding the cooling liquid L to 0C;
, Three open / close valves 240A to 240C.

Each cooling jacket 210A-210C is
One or two or more heating stations are provided for each of the heating stations 100 </ b> A to 100 </ b> C, and the cooling liquid L can be injected to the work W according to the shape and the like of the work W.

The piping 230 is branched into three parts on the way to supply the cooling liquid L to each of the cooling jackets 210A to 210C. Further, on the downstream side of the branched portion, open / close valves 240A to 240C are provided.
The opening / closing valves 240A to 240C are controlled to open and close by a control unit (not shown) according to the cooling timing in each of the heating stations 100A to 100C.

The storage tanks 220A to 220C are arranged one for each of the heating stations 100A to 100C. The bottom portion 221A of the storage tank 220A
Are formed obliquely. This is to collect impurities such as magnetic substance residues contained in the cooling liquid L at one location of the bottom surface portion 221A. That is, the impurities are collected at the lowest point down along the oblique bottom surface portion 221A. The storage tank 220
B and 220C have the same configuration as the storage tank 220A described above.

As shown in FIGS. 1 and 2, a laterally elongated opening 2 is formed on a side wall 222A of the storage tank 220A.
23A has been established. The opening 223A is a part where the lead-out part 500A is attached, and is opened at a position slightly higher than the lowest part of the obliquely formed bottom part 221A. If the opening 223A is not opened at a position slightly higher than the lowest position of the bottom portion 221A, the collected impurities may flow out through the opening 223A. In FIG. 5, the opening 223A is shown for convenience of drawing.
Is provided on the bottom surface, but is actually provided on the side wall 222A as shown in FIGS.

The reason why the opening 223A is formed to be elongated in the horizontal direction is that the speed of the cooling liquid L flowing out is not too high.

As shown in FIGS. 1 and 3, the lead-out portion 500A attached to the opening 223A thus formed is formed in a wide and thin gutter shape corresponding to the opening 223A. That is, a bottom 510A corresponding to the width of the opening 223A, a wall 520A rising from both sides of the bottom 510A, and a lid 530A bridged by the wall 520A are integrally formed.

The bottom 510A has a recess 511A crossing the width direction. Such recess 511A
Is a portion where the electromagnet 600A as a magnet fits. That is, if the concave portion 511A is formed in the entire width of the bottom portion 510A in the lateral direction, the cooling liquid L always passes over the electromagnet 600A accommodated therein, and thus the magnetic substance residue contained in the cooling liquid L is absorbed. The probability increases.

The cover 530A is provided to prevent the cooling liquid L flowing out of the opening 223A from overflowing in the outlet 500A. As shown in FIG.
It is provided only in a portion close to 23A. The cover 530A may be provided entirely, but in this case, it is necessary to make it detachable. This is because it may be necessary to remove the electromagnet from the recess 511A during the operation of removing the magnetic substance residue attached to the electromagnet 600A.

The outlets 500B and 500C attached to the storage tanks 220B and 220C have the same configuration as the outlet 500A.

The outside of the electromagnet 600A is surrounded by a magnetic casing (not shown). The housing is for preventing the magnetic substance residue from directly adsorbing to the iron core. Such a housing is divided into two parts and connected by appropriate connecting means (not shown) such as bolts and nuts.

This housing has a shape and size such that when the electromagnets 600A to 600C are housed in the recess 511A, the upper surface is flush with the bottom 510A of the lead-out portion 500A and is full in the width direction of the recess 511A. Is set to

Thus, the electromagnets 600A to 600C
Are provided to guide the cooling liquid L from each of the storage tanks 220A to 220C to the recovery path 400. However, in order to utilize the potential energy of the cooling liquid L, the outlet sections 500A to 500C are inclined downward toward the recovery path 400. It is installed to become.

The recovery path 400 includes three storage tanks 22.
The cooling liquid L from 0A to 220C is collected and collected in the satellite tank 300 by the pump 410. Further, the recovery path 400 is provided with a cooling unit 420 for cooling the cooling liquid L to a predetermined temperature. Further, the satellite tank 300 is provided with a heating unit 310 for heating the cooling liquid L to a predetermined temperature. The heating unit 310 and the cooling unit 422 adjust the cooling liquid L to an appropriate temperature.

Since the pump 410 provided in the recovery path 400 is provided downstream of the electromagnets 600A to 600C, failure of the pump 410 caused by mixing of the magnetic substance residue into the pump 410 may occur. The likelihood of occurrence is low.

Next, the operation of the induction hardening apparatus configured as described above will be described. First, a workpiece W is loaded from a loading / unloading section (not shown) and is supported by a workpiece support section.
In this state, the work W is heated by the high-frequency heating coils 110A to 110C.

When the predetermined heating of the work W is completed, the open / close valves 240A to 240C of the cooling mechanism 200
Is opened, and the cooling liquid L is sprayed onto the work W from the cooling jackets 210A to 210C. The work W thus hardened is carried out by the carry-in / out section. In this way, the plurality of works W are subjected to induction hardening.

On the other hand, the cooling liquid L injected to the work W
It falls into the storage tanks 220A to 220C installed below the cooling jackets 210A to 210C and the high-frequency heating coils 110A to 110C and is stored. The cooling liquid L contains a magnetic substance residue such as sludge that has been separated from the work W when injected into the work W.

Impurities such as magnetic substance residues contained in the cooling liquid L in the storage tanks 220A to 220C settle down in the cooling liquid L due to their own weight. Furthermore, as the coolant L moves to the openings 223A to 223C, that is, the coolant L moves toward the outlets 500A to 500C, the inclined bottom surfaces 221A to 221C move downward. Then, impurities gather at the lowermost portion of the bottom portions 221A to 221C.

Here, there are impurities which have not settled down to the bottom portions 221A to 221C before reaching the openings 223A to 223A. Among the impurities, the magnetic substance residues are guided to the lead-out portions 500A to 500C from the openings 223A to 223C, and are attracted by the excited electromagnets 600A to 600C. Since the housings of the electromagnets 600A to 600C are flush with the bottoms 510A to 510C of the lead-out portions 500A to 500C, they do not obstruct the flow of the cooling liquid L. In addition, the electromagnets 600A to 600C
Recesses 511A to 511 crossing in the width direction of A to 500C
C, the magnetic substance residue is supplied to the lead-out section 500
It is reliably adsorbed no matter where it flows from A to 500C.

The cooling liquid L from which the magnetic substance residue has been removed passes through the pump 410 and the cooling section 420 in the collecting path 400 and is collected in the satellite tank 300.

After the predetermined number of induction hardening operations are completed, the power supply to the electromagnets 600A to 600C is stopped. Then, the magnetic substance residue attached to the housing can be easily removed from the housing. Further, since the magnetic substance residue adheres to the housing, the electromagnets 600A to 600A
Since it does not enter into a small gap such as a coil constituting C, it is easy to remove it.

In the above embodiment, the electromagnets 600A to 600C are used as magnets, but the present invention is not limited to this. It is also possible to use permanent magnets 700A to 700C as magnets.

In this case, the cooling liquid L is supplied to the permanent magnet 700
A to 700C directly touches the magnetic substance residue, as in the conventional case, so that the operation of removing the magnetic substance residue is troublesome. Therefore, as shown in FIG.
It is provided on the back side of ~ 500C. In this case,
It is not necessary to provide the recesses 511A to 511C as described above.

In this embodiment, the deriving units 500A to 500A
00C, at least permanent magnets 700A to 700C
The part to which is attached must be magnetic. Therefore, the lead portions 500A to 500C may be entirely made of a magnetic material, or a portion to which the permanent magnets 700A to 700C can be attached, that is, a part of the bottom portions 510A to 510C is a magnetic material, and the other portions are It does not have to be a magnetic material. However, it is more efficient to use a magnetic material as a whole because the area for adsorbing the magnetic material residue increases.

In this embodiment, the permanent magnet 700A
When the magnetic material residue is removed from the lead-out portions 500A to 500C, the adsorbed magnetic substance residue can be removed. Further, since the power supply or the like does not need to be considered unlike the electromagnets 600A to 600C, the configuration is further simplified.

In the two embodiments described above, 3
Although described as having one heating station 100A to 100C, it goes without saying that the present invention is not limited to this. That is, one or two heating stations may be used, or four or more heating stations may be used.

[0044]

According to a first aspect of the present invention, there is provided a magnetic hardening device for removing a magnetic substance residue from a storage tank for storing a cooling liquid for cooling a work, and leading the cooling liquid from the storage tank to an external recovery path. It has a lead-out part and a magnet provided in the lead-out part. The lead-out part is formed in a wide thin gutter shape, and the magnet is provided across the width direction of the lead-out part.

Accordingly, the coolant flows through the outlet, and at that time, the magnetic substance residue contained in the coolant is absorbed by the magnet and removed. Therefore, the magnetic substance residue is reliably removed. Further, since the outlet portion has a thin gutter shape, the cooling liquid flowing through the outlet portion becomes shallower, so that the magnetic substance residue can be more reliably absorbed by the magnet.

In the magnetic substance hardening device of the induction hardening apparatus according to the second aspect, the magnet is an electromagnet, and is housed in a recess provided across the width direction of the lead-out portion. Is flush with a portion other than the concave portion of the lead-out portion. For this reason, the flow of the coolant in the outlet section is not obstructed. In addition, if the power supply to the electromagnet is stopped, the magnetic substance residue that has been adsorbed up to that time can be easily removed.

In the magnetic hardening device according to the third aspect of the present invention, the magnet is a permanent magnet, and is provided on the back side of the lead-out portion made of a magnetic material. Therefore, a similar effect can be obtained without considering wiring such as an electromagnet.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of a magnetic substance residue removing mechanism in an induction hardening apparatus of the present invention.

FIG. 2 is a schematic side view of a storage tank used for a magnetic substance residue removing mechanism in the induction hardening apparatus of the present invention.

FIG. 3 is a schematic perspective view of a lead portion used for a magnetic substance residue removing mechanism in the induction hardening apparatus.

FIG. 4 is a schematic sectional view showing another embodiment of the present invention.

FIG. 5 is a schematic configuration diagram of an induction hardening apparatus using a magnetic substance residue removing mechanism in the induction hardening apparatus of the present invention.

[Explanation of symbols]

 220A to 220C Storage tank 400 Recovery path 500A to 500C Outgoing unit 600A to 600C Electromagnet W Work L Coolant

Claims (3)

(57) [Claims] 1. A storage tank for storing a cooling liquid for cooling a work, a lead-out part for leading the cooling liquid from the storage tank to an external recovery path, and a magnet provided in the lead-out part. The lead-out portion is formed in a wide thin gutter shape, and the magnet is provided across the width direction of the lead-out portion. 2. The magnet is an electromagnet, and is housed in a concave portion provided across the width direction of the lead-out portion.
The mechanism for removing a magnetic substance residue in an induction hardening apparatus according to claim 1, wherein an upper surface of the magnet is flush with a portion other than the concave portion of the lead-out portion. 3. The mechanism for removing a magnetic substance residue in an induction hardening apparatus according to claim 1, wherein said magnet is a permanent magnet and is provided on the back side of a lead-out section made of a magnetic substance.