JP2022091185A - Heating device for laminated iron core - Google Patents

Abstract

To provide a heating device for laminated iron cores with countermeasures against thermal expansion on a center guide.SOLUTION: A heating device 10 for a laminated iron core serves to process laminated iron cores 18 and apply a heat process to an adhesive applied to the iron cores 18. The device 10 includes a center guide 24. This center guide 24 is a chuck mechanism with a variable outer diameter. The outer diameter is reduced when setting the iron cores to the center guide. Even if the temperature of the center guide rises, it does not interfere with the setting of the iron cores.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heating device for a laminated iron core.

The laminated iron core is used for motors and the like. The laminated iron core is obtained by adhering the iron core to the iron core. This adhesion is made by heat-treating the adhesive. Various heating devices are known for this purpose (see, for example, Patent Document 1 (FIG. 3)).

Patent Document 1 will be described with reference to the following figure.
FIG. 8 is a diagram illustrating a basic configuration of a conventional heating device, and the heating device 100 is placed on the base 101 so as to surround the base 101, the center guide 102 standing up from the base 101, and the center guide 102. It includes a base plate 103 and a lower plate 104, an induction heating coil 105 arranged so as to surround the base plate 103, a lower plate 104, and a center guide 102, and a top plate 107 and an upper plate 108 suspended by a cylinder 106. ..

A predetermined number of iron cores 109 are placed on the lower plate 104. At this time, the center guide 102 serves to guide the iron core 109. Further, the center guide 102 plays a role of preventing the iron core 109 from moving in the direction perpendicular to the axis of the center guide 102 (the left-right direction in the drawing).

The cylinder 106 is extended to lower the top plate 107 and the upper plate 108, and the iron core 109 is pressed by the upper plate 108.

In this state, the induction heating coil 105 is energized. Magnetic flux is generated from the induction heating coil 105. This magnetic flux generates an eddy current inside the iron core 109. Eddy currents generate Joule heat due to the electrical resistance of the iron core 109. If the adhesive is a thermoplastic resin, it is fluidized by heating and then cured. When the energization is stopped, the iron core 109 is naturally cooled. After that, the iron core 109 is removed from the center guide 102.

FIG. 9 is an enlarged cross-sectional view of a main part of FIG. 8 and is a diagram showing a relationship between a conventional center guide and an iron core.
The iron core 109 is generally manufactured by punching a thin electromagnetic steel plate (silicon steel plate). Therefore, the hole diameter of the central hole 111 inevitably varies. In consideration of this variation and workability, a gap δ is set between the center guide 102 and the iron core 109. This gap δ is about 10 μm.

By the way, in FIG. 8, if the iron core 109 set → heating → cooling → iron core 109 removal is set as one production cycle, this production cycle is repeated.
The center guide 102 also repeats heating and cooling, but the next heating may start before the temperature is sufficiently lowered. That is, when the production cycle is repeated 10 times or more, the expansion of the center guide 102 is accumulated, and it becomes difficult to set and remove the iron core 109.

As a countermeasure, increase the gap δ to about 30 μm. Even if the expansion of the center guide 102 is accumulated, the iron core 109 can be set and removed. However, when the gap δ becomes large, a part of the iron core 109 is laterally displaced when the adhesive is fluidized, and the finishing accuracy of the laminated iron core is lowered.

As another measure, extend the cooling time in one production cycle, or cool for a sufficiently long time after repeating the production cycle 10 times. This eliminates the accumulation of expansion. However, the longer the cooling time, the lower the productivity.

It is not preferable that the finishing accuracy of the laminated iron core is lowered and the productivity is lowered.
Therefore, a heating device having measures against thermal expansion is desired for the center guide 102.

Japanese Unexamined Patent Publication No. 7-298567

An object of the present invention is to provide a center guide with a heating device for a laminated iron core having measures against thermal expansion.

The invention according to claim 1 is a heating device for a laminated iron core, which treats the laminated iron core as a processing target and heat-treats the adhesive applied to the iron core.
It is equipped with a center guide that is inserted into the center hole provided in the iron core.
This center guide is characterized by being a variable outer diameter chuck mechanism whose outer diameter can be changed.

The heating means is basically an induction heating coil, but may be an electric heater, and the heating type is arbitrary.

The invention according to claim 2 is the heating device for the laminated iron core according to claim 1.
It is provided with a base plate, a lower plate to be placed on the base plate, an upper plate to be placed on the iron core on the lower plate, and a top plate to be placed on the upper plate. Made of stainless steel
The lower plate and the upper plate are made of carbon steel that allows magnetic flux to pass through.
An induction heating coil that surrounds the iron core, a tubular ferrite that surrounds the induction heating coil, a lower ferrite that extends from the lower end of the tubular ferrite to the lower plate, and an upper ferrite that extends from the upper end of the tubular ferrite to the upper plate. It is characterized by having.

The invention according to claim 3 is the heating device for the laminated iron core according to claim 1 or 2.
The variable outer diameter chuck mechanism has three claws arranged at a pitch of 120 ° in a plan view.
Two of the claws are fixed claws, and the remaining one is a movable claw driven by an air cylinder.

The invention according to claim 4 is the heating device for the laminated iron core according to claim 1 or 2.
The variable outer diameter chuck mechanism has two claws arranged at a pitch of 180 ° in a plan view.
One of the claws is a fixed claw, and the other one is a movable claw driven by an air cylinder.

The invention according to claim 5 is the heating device for a laminated iron core according to claim 3 or 4.
At least one of the fixed claw and the movable claw is characterized by having a cooling refrigerant passage.

In the invention according to claim 1, the outer diameter of the center guide can be changed. Reduce the outer diameter and set the iron core on the center guide. Even if the temperature of the center guide rises, there is no problem in setting the iron core.
After setting, adjust the outer diameter of the center guide to the hole diameter of the center hole of the iron core. The iron core does not move during the heat treatment.
When removing the iron core from the center guide, reduce the outer diameter. Even if the temperature of the center guide rises, there is no problem in removing the iron core.
Therefore, according to the present invention, the center guide is provided with a heating device for a laminated iron core with measures against thermal expansion.

In the invention according to claim 2, the induction heating coil surrounding the iron core is surrounded by a tubular ferrite. A part of the magnetic flux generated by the induction heating coil is promoted by the tubular ferrite.
However, a part of the magnetic flux extending from the tubular ferrite is cut off by the base plate or the top plate. This cutoff includes making it difficult for magnetic flux to pass through. The same applies below.
As a countermeasure, in the present invention, the lower ferrite and the upper ferrite are attached to the tubular ferrite.
The magnetic flux extending from the tubular ferrite is induced by the lower ferrite and the upper ferrite and is used for heating the iron core.

In the present invention, the iron core is heated to a predetermined temperature in a shorter time. On the other hand, since the heating efficiency is good, the temperature rise of the center guide increases and the thermal expansion increases. However, if the center guide is a variable outer diameter chuck mechanism, thermal expansion does not matter.
Therefore, according to the present invention, there is provided a heating device for a laminated iron core having measures against thermal expansion as a center guide while increasing the heating efficiency of the iron core.

In the invention according to claim 3, the main part of the outer diameter variable chuck mechanism is composed of two fixed claws and one movable claw. Compared to the structure in which all three claws are made variable, if only one is made a movable claw, the device can be simplified and the equipment cost can be reduced.

In the invention according to claim 4, the main part of the outer diameter variable chuck mechanism is composed of one fixed claw and one movable claw. If the number of fixed claws is one as compared with the structure of two fixed claws, the device can be further simplified and the equipment cost can be further reduced.

In the invention according to claim 5, a refrigerant passage is provided in the claw. By cooling the nails with water or the like, the temperature rise of the nails can be suppressed. Compared to the structure in which the claws are naturally cooled in the atmosphere, if the claws are forcibly cooled with a refrigerant, the time for cooling the claws can be shortened and the operating rate of the heating device can be increased.

It is sectional drawing of the heating apparatus of the laminated iron core which concerns on this invention. It is a figure explaining the magnetic flux, (a) is the figure which shows the comparative example, (b) is the figure which shows the Example. FIG. 3 is a sectional view taken along line 3-3 of FIG. It is a cross-sectional view taken along line 4-4 of FIG. It is a figure explaining the operation of the outer diameter variable chuck mechanism. It is a figure explaining the modification example of the outer diameter variable chuck mechanism. It is a figure explaining the refrigerant passage. It is a figure explaining the basic structure of the conventional heating apparatus. FIG. 8 is an enlarged cross-sectional view of a main part of FIG. 8 and is a diagram showing a relationship between a conventional center guide and an iron core.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the heating device 10 for the laminated iron core is mounted on the gantry base 11, the portal base 12 mounted on the gantry base 11, the base plate 13 mounted on the gantry base 12, and the base plate 13. A lower plate 14, an upper plate 15 arranged above the lower plate 14, a top plate 16 mounted on the upper plate 15, a pressing means 17 for applying a downward force to the top plate 16, and an iron core 18. An induction heating coil 19 arranged so as to surround the induction heating coil 19, a tubular ferrite 21 arranged so as to surround the side surface of the induction heating coil 19, and an arrangement extending from the lower end of the tubular ferrite 21 to the lower plate 14. The lower ferrite 22 is provided, the upper ferrite 23 is arranged so as to extend from the upper end of the tubular ferrite 21 to the upper plate 15, and the center guide 24 for positioning the iron core 18 sandwiched between the lower plate 14 and the upper plate 15 is provided. ing.

The lower ferrite 22 extending from the lower end of the tubular ferrite 21 has a structure in which the lower ferrite 22 is arranged at a predetermined distance from the lower end of the tubular ferrite 21, and the lower ferrite 22 is the lower end of the tubular ferrite 21. Refers to both structures placed in contact with. The same applies to the upper ferrite 23.

The center guide 24 is a variable outer diameter chuck mechanism 30.
The outer diameter variable chuck mechanism 30 extends upward from, for example, a rail 31 mounted on the gantry base 11, a slider 32 movably fitted to the rail 31, an air cylinder 33 for driving the slider 32, and the slider 32. A columnar movable claw 34 that penetrates a gate-shaped base 12, a base plate 13, a lower plate 14, an iron core 18, and an upper plate 15, and a lower plate 14, an iron core that is arranged parallel to the movable claw 34 and extends upward from the base plate 13. It consists of a columnar fixing claw 35 penetrating the 18 and the upper plate 15.

The iron core 18 is a silicon steel plate (electromagnetic steel plate) having a thickness of 0.2 to 0.5 mm, and is a perforated plate having an inner diameter of 50 to 150 mm and an outer diameter of 200 to 250 mm.
An adhesive with a thickness of several μm is locally (or entirely) applied to the upper and lower surfaces of the iron core 18 punched from the coil of the silicon steel plate by pressing, and a predetermined number of perforated plates are piled (laminated). Then, for example, a laminated iron core having a height of 50 to 150 mm can be obtained.

The adhesive may be a thermosetting resin that is fluidized by heating and cured at about 180 ° C., for example, an epoxy resin, an acrylic resin, or a silicone rubber resin, and can be arbitrarily selected.

The lower plate 14 and the upper plate 15 are carbon steel plates.
Preferably, a gap δ1 of about several mm is secured between the fixed claw 35 and the movable claw 34. This gap δ1 blocks or suppresses heat transfer from the lower plate 14 and the upper plate 15 to the fixed claw 35 and the movable claw 34.

Next, the presence or absence of the lower ferrite 22 and the upper ferrite 23, and the materials of the base plate 13 and the top plate 16 will be examined.

〇Case 1: When the base plate 13 and the top plate 16 are made of carbon steel and there is no lower ferrite 22 and upper ferrite 23:
The magnetic flux generated by the induction heating coil 19 passes through the tubular ferrite 21, the lower plate 14 and the upper plate 15, and the base plate 13 and the top plate 16.
The tubular ferrite 21 promotes the utilization of magnetic flux.
The lower plate 14 and the upper plate 15 are heated by magnetic flux and transferred to the iron core 18.

The base plate 13 and the top plate 16 are also heated by the magnetic flux. Part of this heat goes to the lower plate 14 and the upper plate 15, but most of it is dissipated to the atmosphere. This heat dissipation causes a decrease in the heating efficiency of the iron core 18.

〇Case 2: When the base plate 13 and the top plate 16 are made of stainless steel and there is no lower ferrite 22 and upper ferrite 23:
Since the base plate 13 and the top plate 16 do not pass magnetic flux, the magnetic flux generated by the induction heating coil 19 passes through the tubular ferrite 21 and the lower plate 14 and the upper plate 15.
The tubular ferrite 21 promotes the utilization of magnetic flux.
The lower plate 14 and the upper plate 15 are heated by magnetic flux and transferred to the iron core 18.

The case 2 is preferable to the case 1 because the heat radiation from the base plate 13 and the top plate 16 to the atmosphere is eliminated or suppressed.

Therefore, the base plate 13 and the top plate 16 are made of stainless steel, which makes it difficult for magnetic flux to pass through.
Stainless steel includes austenitic stainless steel, ferrite stainless steel, and martensitic stainless steel. Ferritic and martensitic stainless steels are magnetic materials and are not suitable because they pass magnetic flux well.
On the other hand, the austenitic stainless steel (for example, SUS304) is a non-magnetic material and is suitable because it is difficult for magnetic flux to pass through.

The structure of the case 2 described above will be further described with reference to FIG. 2 (a), and the improved structure of the case 2 will be described with reference to FIG. 2 (b). That is, the actions of the tubular ferrite 21, the lower ferrite 22, and the upper ferrite 23 will be described with reference to FIGS. 2 (a) and 2 (b).

FIG. 2A is a diagram showing a comparative example, and the tubular ferrite 21 plays a role of promoting effective utilization of the magnetic flux generated by the induction heating coil 19.
A part of the magnetic flux 26 passes through the iron core 18 via the upper plate 15 and the lower plate 14. Further, another magnetic flux 27 is directed toward the base plate 13 and the top plate 16. The base plate 13 and the top plate 16 cut off the magnetic flux 27. Therefore, the magnetic flux 27 cannot be effectively utilized.

FIG. 2B is a diagram showing an embodiment, in which the magnetic flux 27 is guided by the lower ferrite 22 and the upper ferrite 23. Since the upper plate 15 and the lower plate 14 are carbon steel plates, the magnetic flux 27 is passed therethrough.
That is, the magnetic flux 27 passes through the upper plate 15, the iron core 18, passes through the lower plate 14, and returns to the tubular ferrite 21. As a result, the magnetic flux 27 can be effectively utilized.
Therefore, it is effective to attach the lower ferrite 22 and the upper ferrite 23 to the tubular ferrite 21.

As shown in FIG. 3, the variable outer diameter chuck mechanism 30 has three claws 34, 35, 35 arranged at a pitch of 120 ° in a plan view, and two of the claws are fixed claws 35, 35. The remaining one is a movable claw 34 driven by an air cylinder 33.

As shown in FIG. 4, a rail 31 is mounted on a gantry base 11, a slider 32 is fitted on the rail 31 so as to be movable in the front and back directions of the drawing, and a movable claw 34 is fixed to the slider 32 by a bolt or the like. Preferably, a steel ball 36 is interposed between the rail 31 and the slider 32. When the steel ball 36 is interposed, the coefficient of friction between the rail 31 and the slider 32 is significantly reduced, and the slider 32 and the movable claw 34 move smoothly without shaking.

It should be noted that one rail 31 may be replaced with a left guide bar and a right guide bar, and the slider 32 may be guided by these left guide bars and right guide bars. Therefore, the structure of FIG. 4 may be changed as appropriate, and the point is that the movable claw 34 may move smoothly without shaking or rattling.

The operation of the outer diameter variable chuck mechanism 30 having the above configuration will be described with reference to FIG.
Before setting the iron core, as shown in FIG. 5A, the movable claw 34 is retracted from the circumscribed circle 37 of the fixed claw 35.

As shown in FIG. 5 (b), the iron core 18 is set. At this time, the central hole 38 of the iron core 18 is displaced from the circumscribed circle 37. The central hole 38 can be set so as not to hit the three claws 34, 35, 35.

As shown in FIG. 5 (c), the movable claw 34 is advanced. A forward force of an air cylinder (FIG. 1, reference numeral 33) is always applied to the movable claw 34. As a result, two fixed claws 35 and one movable claw 34 hit the iron core 18 with honey. In this state, it is heated to fluidize and cure the adhesive.
In the process of heating, the iron core 18 does not shift in the left-right direction of the drawing. A laminated iron core with good dimensional accuracy can be obtained.

After heating is completed, the movable claw 34 is retracted as shown in FIG. 5 (d). The movable claw 34 is separated from the iron core 18, and the iron core 18 is separated from the fixed claw 35. As a result, the iron core 18 can be easily removed, and the work efficiency is improved.

Next, an example of modification according to the present invention will be described.
As shown in FIG. 6A, the variable outer diameter chuck mechanism 30 has two claws 34, 35 arranged at a pitch of 180 ° in a plan view, one of the claws is a fixed claw 35, and the rest. One of them may be a movable claw 34 driven by an air cylinder 33.
Since there is only one fixed claw 35, the outer diameter variable chuck mechanism 30 becomes simple.

Further, as shown in FIG. 6B, the outer diameter variable chuck mechanism 30 has three movable claws 34 arranged at a pitch of 120 ° in a plan view, and each of the movable claws 34 is operated by an air cylinder 33. It may be driven.
Further, as shown in FIG. 6 (c), the outer diameter variable chuck mechanism 30 has two movable claws 34 arranged at a pitch of 180 ° in a plan view, and each of the movable claws 34 is operated by an air cylinder 33. It may be driven.

Further, as shown in FIG. 7, the fixed claw 35 may be provided with a cooling refrigerant passage 35a, and the movable claw 34 may be provided with a cooling refrigerant passage 34a. By passing water or air through the refrigerant passages 34a and 35a, the temperature change of the fixed claw 35 and the movable claw 34 can be suppressed.

The refrigerant passages 34a and 35a are not essential, but in the laminated iron core heating device 10 shown in FIG. 1, when the production cycle is continued 10 times, the temperature of the fixed claw 35 and the movable claw 34 gradually rises.
As a countermeasure, for example, after 10 production cycles are completed, it is conceivable to set a "cooling time for a while" and then restart the next 10 production cycles. However, if this measure is taken, productivity will decrease slightly.
With the structure shown in FIG. 7, it is not necessary to set a "cooling time for a while", and the productivity is improved.

In addition, in FIG. 7, both the refrigerant passage 34a and the refrigerant passage 35a may be provided, or only one of them may be provided. It is necessary to connect a flexible hose to the refrigerant passage 34a provided in the movable claw 34, which increases the equipment cost. If only the refrigerant passage 35a is provided without providing the refrigerant passage 34a, the flexible hose becomes unnecessary and the equipment cost can be reduced.

The present invention is suitable for a heating device that heats an iron core with an adhesive to form a laminated iron core.

10 ... Laminated iron core heating device, 13 ... Base plate, 14 ... Lower plate, 15 ... Upper plate, 16 ... Top plate, 18 ... Iron core, 19 ... Induction heating coil, 21 ... Cylindrical ferrite, 22 ... Lower ferrite, 23 ... Upper ferrite, 24 ... Center guide, 26, 27 ... Magnetic flux, 30 ... Variable outer diameter chuck mechanism, 34 ... Movable claw, 34a, 35a ... Refrigerant passage, 35 ... Fixed claw, 38 ... Center hole.

The invention according to claim 1 is a heating device for a laminated iron core, which treats the laminated iron core as a processing target and heat-treats the adhesive applied to the iron core.
It is provided with a base plate, a lower plate to be placed on the base plate, an upper plate to be placed on the iron core on the lower plate, and a top plate to be placed on the upper plate. Made of stainless steel
The lower plate and the upper plate are made of carbon steel that allows magnetic flux to pass through.
An induction heating coil that surrounds the iron core, a tubular ferrite that surrounds the induction heating coil, a lower ferrite that extends from the lower end of the tubular ferrite to the lower plate, and an upper ferrite that extends from the upper end of the tubular ferrite to the upper plate. Equipped with
It is equipped with a center guide that is inserted into the center hole provided in the iron core.
This center guide is a variable outer diameter chuck mechanism that can change the outer diameter .
The outer diameter variable chuck mechanism includes an air cylinder, a slider moved by the air cylinder, a rail for guiding the slider, and a movable claw attached to the slider.
The air cylinder, the slider, and the rail are arranged outside the region sandwiched between the base plate and the top plate .

The invention according to claim 2 is the heating device for the laminated iron core according to claim 1 .
The variable outer diameter chuck mechanism has three claws arranged at a pitch of 120 ° in a plan view.
Two of the claws are fixed claws, and the remaining one is the movable claw driven by the air cylinder.

The invention according to claim 3 is the heating device for the laminated iron core according to claim 1 .
The variable outer diameter chuck mechanism has two claws arranged at a pitch of 180 ° in a plan view.
One of the claws is a fixed claw, and the other one is the movable claw driven by the air cylinder.

The invention according to claim 4 is the heating device for a laminated iron core according to claim 2 or 3 .
The fixed claw and the movable claw are inserted into the central hole of the iron core heated by the induction heating coil.
In order to suppress a temperature change of at least one of the fixed claw and the movable claw, at least one of the fixed claw and the movable claw is characterized by having a cooling refrigerant passage.

In addition, in the invention according to claim 1 , the induction heating coil surrounding the iron core is surrounded by a tubular ferrite. A part of the magnetic flux generated by the induction heating coil is promoted by the tubular ferrite.
However, a part of the magnetic flux extending from the tubular ferrite is cut off by the base plate or the top plate. This cutoff includes making it difficult for magnetic flux to pass through. The same applies below.
As a countermeasure, in the present invention, the lower ferrite and the upper ferrite are attached to the tubular ferrite.
The magnetic flux extending from the tubular ferrite is induced by the lower ferrite and the upper ferrite and is used for heating the iron core.

In the present invention, the iron core is heated to a predetermined temperature in a shorter time. On the other hand, since the heating efficiency is good, the temperature rise of the center guide increases and the thermal expansion increases. However, if the center guide is a variable outer diameter chuck mechanism, thermal expansion does not matter.
Therefore, according to the present invention, there is provided a heating device for a laminated iron core having measures against thermal expansion as a center guide while increasing the heating efficiency of the iron core.
Further, in the invention according to claim 1, the outer diameter variable chuck mechanism includes an air cylinder, a slider moved by the air cylinder, a rail for guiding the slider, and a movable claw attached to the slider. , The air cylinder, the slider and the rail are arranged outside the region sandwiched between the base plate and the top plate .

In the invention according to claim 2 , the main part of the outer diameter variable chuck mechanism is composed of two fixed claws and one movable claw. Compared to the structure in which all three claws are made variable, if only one is made a movable claw, the device can be simplified and the equipment cost can be reduced.

In the invention according to claim 3 , the main part of the outer diameter variable chuck mechanism is composed of one fixed claw and one movable claw. If the number of fixed claws is one as compared with the structure of two fixed claws, the device can be further simplified and the equipment cost can be further reduced.

In the invention according to claim 4 , a refrigerant passage is provided in the claw. By cooling the nails with water or the like, the temperature rise of the nails can be suppressed. Compared to the structure in which the claws are naturally cooled in the atmosphere, if the claws are forcibly cooled with a refrigerant, the time for cooling the claws can be shortened and the operating rate of the heating device can be increased.

Claims (5)

It is a heating device for a laminated iron core that heat-treats the adhesive applied to the laminated iron core as a processing target.
It is equipped with a center guide that is inserted into the center hole provided in the iron core.
This center guide is a heating device for laminated iron cores, which is characterized by a variable outer diameter chuck mechanism that can change the outer diameter. The heating device for a laminated iron core according to claim 1.
It is provided with a base plate, a lower plate to be placed on the base plate, an upper plate to be placed on the iron core on the lower plate, and a top plate to be placed on the upper plate. Made of stainless steel
The lower plate and the upper plate are made of carbon steel that allows magnetic flux to pass through.
An induction heating coil that surrounds the iron core, a tubular ferrite that surrounds the induction heating coil, a lower ferrite that extends from the lower end of the tubular ferrite to the lower plate, and an upper ferrite that extends from the upper end of the tubular ferrite to the upper plate. A heating device for a laminated iron core, which is characterized by being equipped with. The heating device for a laminated iron core according to claim 1 or 2.
The variable outer diameter chuck mechanism has three claws arranged at a pitch of 120 ° in a plan view.
A heating device for a laminated iron core, characterized in that two of the claws are fixed claws and the remaining one is a movable claw driven by an air cylinder. The heating device for a laminated iron core according to claim 1 or 2.
The variable outer diameter chuck mechanism has two claws arranged at a pitch of 180 ° in a plan view.
A heating device for a laminated iron core, characterized in that one of the claws is a fixed claw and the other one is a movable claw driven by an air cylinder. The heating device for a laminated iron core according to claim 3 or 4.
A heating device for a laminated iron core, characterized in that at least one of the fixed claw and the movable claw has a cooling refrigerant passage.

Images