JP2599465B2 - Manufacture of iron core - Google Patents

Description

The present invention relates to a method of manufacturing a laminated iron core by punching an iron core from an iron core plate, and laminating the iron cores, and a method of manufacturing a laminated iron core. The present invention relates to a device for applying a pressing force to a lower surface of an iron core.

[Technical background]

As a method for producing this type of laminated iron core, Japanese Patent Application Laid-Open No. 62-20 / 1987
There are techniques described in JP-A-9814 and JP-A-63-237405. This technique will be described with reference to FIGS. 1 to 4 showing one embodiment of the present invention. First, as shown in FIG. 1, a belt-shaped iron core that runs linearly and intermittently at a position A. A material for the iron core 1 'is removed on the plate 1, and a downward caulking projection 2 is formed in the material removing portion by a punch.

Subsequently, at the position C, the material removing portion is punched by the punch 8 on the lower die 3 to obtain the iron core 1 ′, and the iron core 1 ′ is dropped into the die 3 to At the same time, the upper and lower iron cores 1 'and 1' which are stacked and overlapped on the dropped iron core 1 'are fitted together with the projections 2 and the recessed portions on the upper surfaces of the projections 2 to be integrated into a laminated iron core 1 ".

Also, as shown in FIGS. 2 to 4, a caulking ring 4 is provided on the lower surface of the die 3, and the laminated iron core 1 ″ extruded from the lower surface of the die 3 is press-fitted into the caulking ring 4. Then, the laminated iron core 1 ″ is held by the side pressure of the caulking ring 4. Below the caulking ring 4, there is provided a receiving base 6 which advances and retreats toward the caulking ring 4 by the cylinder 5. The receiving base 6 is brought into contact with the lower surface of the laminated iron core 1 ″ projecting from the lower surface of the caulking ring 4. The pressing force of the cylinder 5 is applied to the laminated iron core 1 ″ through the receiving base 5.

On the other hand, at the position shown in FIG. 1B, the punch is lowered deeper than usual for every required number of layers of the iron cores 1 'to be punched out, and the projections 2 are punched to form through holes. The through hole is made to correspond to the recessed portion between the core 1 'and the projection 2 and the recessed portion are not fitted to each other, so that the two iron cores 1' and 1 'are not integrated, and the laminated iron core 1 "is formed. When the separation surface 1a comes out of the lower surface of the caulking ring 4 (FIG. 3), the receiving table 6 is lowered by the cylinder 5 as shown in FIG. Cylinder 9
Is extended, and the laminated iron core 1 ″ on the
To the required position.

[Problems to be solved by the invention]

In the manufacture of the laminated iron core 1 ″, it is preferable that the iron cores 1 ′ have as few gaps as possible and that the projections 2 and the recessed portions are firmly caulked from the viewpoint of iron core performance. The degree of caulking is determined by the side pressure of the caulking ring 4 and the pressurizing force of the cylinder 5. This is because, when caulking with the punch 8, the lower the laminated iron core 1 ″ moves, the weaker the caulking force.

At this time, since the laminated iron core 1 "also has to descend in the caulking ring 4 in accordance with the lowering of the punch 8, the side pressure of the caulking ring 4 cannot be increased more than necessary. When the hole is small, the iron core 1 'is more likely to be deformed when it passes therethrough. It is necessary to increase the internal pressure, that is, the pressing force of the cylinder 5.

On the other hand, in order to send the laminated iron core 1 "to a required position, if the pressure (back pressure) of the cylinder 5 is applied to the lower surface of the laminated iron core 1", the side pressure of the caulking ring 4 and the pressure of the cylinder 5 The laminated iron core 1 ″ is in a state of being sandwiched by the pressing force, and the laminated iron core 1 ″ cannot be sent out by the pushing plate 10. For this reason, as shown in FIG. 4, the receiving stand 6 is sufficiently lowered to release the above-mentioned sandwiched state.

After the release, when the feeding of the laminated iron core 1 ″ is completed, the receiving table 6 rises again and comes into contact with the lower surface of the laminated iron core 1 ″ protruding from the caulking ring 4. At this contact, if the rise of the cradle 6 can be stopped instantaneously, the cradle 6 can be stopped immediately immediately before the abutment, and no contact force is applied to the laminated iron core 1 ″. Due to the characteristics of the cylinder 5, which is a pressure device, that is, even if the feeding of fluid to the cylinder 5 is stopped, the cradle 6 rises due to inertia, so it is impossible to stop instantaneously, and the contact force is not small. Joins laminated iron core 1 ″. The force becomes a push-up force, and the caulking ring 4 and the laminated iron core 1 ″ in the lower die 3 are pushed back to cause inconvenience such as protruding from the upper surface of the lower die 3. 8 interferes with the punching action.

On the other hand, in order to minimize the contact force due to the inertia, the extension speed of the cylinder 5 may be suppressed. However, a decrease in the extension speed decreases work efficiency. That is, this is against the speeding up of the work.

The present invention, under the above circumstances, when the above-mentioned pedestal rises,
It is an object of the present invention to eliminate the contact force with the lower surface of the laminated iron core 1 ″.

[Means for solving the problem]

In order to solve the above-mentioned problems, according to the present invention, there is provided a method for manufacturing a laminated iron core by applying an upward pressure (back pressure) to the laminated iron core 1 ″ by the above-described support 6.
When the receiving table 6 is stopped, the laminated iron core 1 "protruding from the lower surface of the caulking ring 4 is brought into contact with the receiving table 6 by descending.

In the invention relating to a device for applying pressure to the laminated iron core 1 ″ in which the laminated iron core 1 ″ is brought into contact with the receiving table 6 by descending, the above-mentioned receiving member in which the lower surface of the laminated iron core 1 ″ projecting from the caulking ring 4 contacts The table 6, the cylinder 5 for moving the receiving table 6 toward and away from the caulking ring 4 and maintaining a required pressing force, and the receiving table 6 provided below the caulking ring 4 are brought into contact with each other, and A stopper 7 for preventing the ascending; the stopper 7 is located outside the area of the swaging ring 4 through which the laminated iron core 1 "passes, so as not to hinder the passage of the laminated iron core 1". It is a configuration that is located.

[Action]

According to the present invention constructed as described above, the laminated iron core 1 "is manufactured by the same operation as that of the above-described conventional example, but the laminated iron core 1" from the caulking ring 4 is stopped by the stopper when the pedestal 6 is raised in the operation. If the pedestal 6 is brought into contact with the stopper 7 before projecting from the lower surface of the cylinder 7, the lower surface of the laminated iron core 1 "comes into contact with the pedestal 6 by lowering, so that the required pressure in the cylinder 5 is reduced. The crimping action of the iron core 1 'is performed, that is, the contact force when the cradle 6 is lifted does not act on the laminated iron core 1 ".

〔Example〕

FIG. 1 shows an example of a processing step of the laminated iron core 1 ″. At positions A to F, various types of processing described later are performed, and the positions are set at equal intervals. The core plate 1 is intermittently fed at a stroke at each position interval, and each process is performed when the core plate 1 stops.

The process of providing the caulking protrusion 2 for lamination of the iron core 1 'at the position of the point A and the position of the point D, and the process of knocking down the caulking protrusion 2 at the position of the point B and the position of the point E are performed at the position of the point C. And F
The punching of the iron core 1 'is performed at the position of the point. For this reason, in this embodiment, two types of doughnut-shaped iron cores 1 ′ having different diameters are obtained from the iron core plate 1, and the same action is obtained at each position of A and D, B and E, and C and F. Therefore, only the operation at each of the positions A, B, and C will be described below. In addition, the formation position of the caulking protrusion 2 of the iron core plate 1 and the iron core
As for the punching position 1 ', the material is preliminarily cut out on the iron core plate 1 by visual measurement.
To be sent intermittently.

The formation of the caulking projection 2 at the position A is performed by lowering a punch (not shown).
It faces downward as shown in the figure. A circular hole in the center at the same time as this caulking
1b is punched. In the processing at the position B, a punch (not shown) descends and knocks down the caulking projection 2, and the punch works according to the number of laminations of the iron cores 1 'described later. That is, the shot-down action is performed at the stroke interval of the number of layers. In addition, the processing at the position B is stopped, and at the position A, the working length of the punch is increased by the caulking action interval (the stroke interval) of the lamination number, and the protrusion 2
Can be shot down without forming.

The punching at the point C is performed by lowering the punch 8, whereby the donut-shaped iron core 1 ′ is punched, and the iron core 1 ′ is dropped into the lower die 3. The upper and lower iron cores 1 ', 1', which are stacked on the iron core 1 ', and the recesses of the protrusions 2 of the upper and lower iron cores 1', 1 'are fitted together to be integrated. That is, the respective iron cores 1 'are laminated and integrated to form a laminated iron core 1 ".

A caulking ring 4 is provided on the lower surface of the lower die 3, and the caulking ring 4 has an inner circumference narrower by about 5 to 10 μ around the front circumference than the hole of the lower die 3. The iron core 1 'is press-fitted by the downward force of the punch 8 and the laminated iron core 1 "is supported by the side pressure of the caulking ring 4. Therefore, as shown in FIGS.
Each time the punch 8 is punched and lowered, the iron core 1 ′ descends in the caulking ring 4 by the thickness of one sheet, and the projection 2 and the recessed portion are fitted.

On the other hand, at the position B, the iron core 1 ′ lacking the caulking projection 2 is punched out by the punch 8 to form the lower die 3.
When it is dropped into the inside, it has no projection 2 and is a through hole, so that it does not fit with the lower iron core 1 ′, and the separation surface 1 a is formed. That is, the protrusions 2 of the iron core 1 ′ are not fitted every required number of sheets, and the iron core 1 ′ becomes the required number of laminated iron cores 1 ″ and descends in the lower die 3 and the caulking ring 4. As shown in FIGS. 3 and 4, when the separation surface 1a passes below the lower surface of the caulking ring 4, the free fall is possible.

A stopper 7 is provided on the lower surface of the caulking ring 4,
Below the stopper 7, a receiving table 6 which is moved up and down by the cylinder 5 is located. The pedestal 6 is in contact with the stopper 7 before the laminated iron core 1 "protrudes from the lower surface of the stopper 7 (the state shown in FIG. 2). , And after that,
As shown in FIG. 3, the cradle 6 descends while pushing down. For this reason, the pressure applied from the cylinder 5 acts upward on the laminated iron core 1 ″, that is, a pressure (back pressure) against the descending force of the punch 8 acts, and this back pressure causes
The caulking between the iron cores 1 'and 1' in the laminated iron core 1 "becomes stronger.

If the laminated iron core 1 ″ passes through the caulking ring 4 (third
As shown in FIG. 4 and FIG.
Is lowered, the laminated iron core 1 "is disengaged from the stopper 7, the holding plate 10 is moved rightward by the cylinder 9, and the laminated iron core 1" is withdrawn from the receiving table 6 and sent out to a required position. When the feeding is completed, the cradle 6 is raised by the cylinder 5 and returns to the initial state in FIG. Thereafter, the same operation is repeated.

In a state where the receiving table 6 is in contact with the stopper 7 and the laminated iron core 1 ″, the fluid pressure in the cylinder 5 is set to a predetermined value. The pressure is relieved by the circuit to always obtain a stable pressure (back pressure).

〔effect〕

The present invention is configured as described above, and the contact force when the pedestal rises is prevented from being applied to the laminated iron core. Therefore, there is no fear that the laminated iron core is pushed up by the contact force, so that there is no problem in processing.

Further, since the contact force is not applied, there is no problem even if the rising speed of the cradle is increased, so that the operation can be speeded up.

[Brief description of the drawings]

The drawings show an embodiment of the method for manufacturing an iron core according to the present invention. FIG. 1 is a plan view of a processing step of the iron core, and FIGS. 2 to 4 show an action of taking out a laminated iron core. It is a vertical side view. 1 ... iron core plate, 1 '... iron core, 1a ... separation surface, 1 "...
Laminated iron core, 2 ... Projection, 3 ... Lower die, 4 ... Caulking ring, 5 ... Cylinder, 6 ... Cradle, 7 ... Stopper, 8 ... Punch, 9 ... Take-out cylinder, 10 ... Veneer.

Claims (2)

(57) [Claims] 1. An iron core 1 'is removed on an iron core plate 1.
A downwardly caulking projection 2 is formed by a punch in the material removing portion.
Then, on the lower die 3, the material removing portion is punched by a punch 8 to obtain the iron core 1 ′, and the iron core 1 ′ is dropped into the die 3 to The upper and lower iron cores 1 ′ and 1 ′ that are simultaneously laminated and stacked on the dropped iron core 1 ′ are fitted together with the projections 2 and the recessed portions on the upper surfaces of the projections 2 to integrally form the laminated iron core 1 ″. The laminated iron core 1 ″ extruded from the lower surface of the die 3 is press-fitted into the caulking ring 4 on the lower surface, and the laminated iron core 1 ″ is held by the side pressure of the caulking ring 4. A receiving table 6 which advances and retreats toward the caulking ring 4 by a cylinder 5 for maintaining a required pressing force is brought into contact with the lower surface of the laminated iron core 1 ″ protruding from the lower surface of the caulking ring 4 and passes through the receiving table 6. The pressing force of the cylinder 5 A material removing portion applied to the iron core 1 "and corresponding to the required number of laminations of the iron core 1 'is punched out of the caulking protrusion 2 to form a through hole, and the material removing portion having this through hole is formed. Iron core 1 'obtained from the part
By making the through hole correspond to the recessed portion between the lower core 1 'and the lower core 1', the fitting of the protrusion 2 and the recessed portion is eliminated, and the two cores 1 'and 1' are not integrated. A separation surface 1a of the laminated iron core 1 "is formed. When the separation surface 1a comes out from the lower surface of the caulking ring 4, the pedestal 6 is lowered by the cylinder 5 and the laminated iron core on the pedestal 6 is formed. 1 "is a method for manufacturing an iron core for feeding 1" to a required position, wherein the laminated iron core 1 "protruding from the lower surface of the caulking ring 4 is brought into contact with the pedestal 6 by being lowered while the pedestal 6 is stopped. A method for producing an iron core. 2. An apparatus for applying pressure to the lower surface of the laminated iron core 1 "used in the method of manufacturing an iron core according to claim 1, wherein the lower surface of the laminated iron core 1" protruding from the lower surface of the caulking ring 4 is used. The above-mentioned receiving table 6 which contacts, the cylinder 5 which moves the receiving table 6 toward and away from the caulking ring 4 and maintains a required pressing force, and the receiving table 6 provided below the caulking ring 4 come into contact with each other. The stopper 7 is located outside the advance / retreat area of the laminated iron core 1 "of the caulking ring 4 and hinders the passage of the laminated iron core 1". A pressure applying device for applying pressure to the lower surface of the laminated iron core, wherein