JPH03124329A - Pressing method for iron core - Google Patents

Abstract

PURPOSE:To increase the speed of the press working by setting the stopper at the hydraulic pressure equipment for the receiving stand set at the down side of the die of the punching and calking stage and relieving the dropping force of the laminated products on the progressive die for the laminated iron core. CONSTITUTION:On the progressive die which sets the calking projecting part 2 at the iron core plate 1 and punches the part including this projecting part 2 and executes to form the iron core 1' and to laminate, the receiving stand 6 for the laminated iron core group is set at the down side of the die of the stage of the outer shape punching and the mutual calking. On this receiving stand 6, the hydraulic pressure machinery for making the reaction of the descending stroke time of the punch 8 is set and is composed so that the back pressure is generated by descending the punched iron core 1'. In such a way, troubles in the pressing are eliminated and the very high speed operation of the pressing is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an iron core pressing method in which punched iron cores are laminated on a punching stage.

[Conventional technology and its problems]

The conventional iron core pressing method is to first provide caulking protrusions on a punched material, then punch out the part including the protrusions to obtain an iron core plate, and then press the blanks that are punched out in advance in this punching stage. A required number of iron core plates are laminated by repeatedly bonding and laminating the iron core plates by press-fitting their protrusions into each other.

In this case, it is desirable to have as few gaps as possible between the iron cores and to obtain a strong caulking force, but this requires sufficient processing force in the lamination stage.

For this reason, it is necessary to increase the pressure of the fluid pressure equipment located at the bottom of the mold.

In addition, in order to take the laminated iron core out of the mold, if the back pressure of the fluid pressure equipment mentioned above is acting, the laminated product will be pinched by that pressure and cannot be taken out, so the fluid pressure equipment must be used. It is necessary to avoid getting caught by letting it escape downward.

Because of these problems, even if the raising and lowering operations of fluid pressure equipment are controlled via solenoid valves, it is not possible to immediately switch between up and down operations, and due to the inertia peculiar to fluid pressure equipment, the fluid pressure During the lifting operation of the equipment, the upward pressure acts directly on the iron core group driven into the die, pushing the iron core group back.

This causes trouble during press working.

In addition, in order to avoid the effects of inertia, the stroke length that must be used to suppress the speed of fluid pressure equipment is shortened as much as possible, making it possible to increase the speed of the press by pressing the iron core. The purpose is to provide a method.

[Means to solve the problem]

In order to achieve the above object, the present invention provides caulking protrusions on an iron core plate of a punched material, then punches out a portion including the protrusions to obtain an iron core, and press-fits the protrusions into each other at this punching stage. The iron cores are stacked by fitting, and when a predetermined press stroke is carried out by repeating this process one after another, by cutting out the outline of the iron core plate with the caulking protrusion removed, it is possible to stack the iron cores at that stage. In an iron core pressing method in which the laminated thickness of the laminated iron core can be determined by forming a separation surface that does not caulk and fit with the iron core, a stage for cutting the outer shape of the iron core and mutually fitting and caulking the iron core. A cradle is provided below the die to receive the laminated iron core group,
Since a fluid pressure device is installed on this cradle to apply pressure opposite to the downward movement of the cradle due to the downward stroke of the punch, and an upper limit stopper of the cradle is placed above the fluid pressure device, high-speed press processing cannot be achieved.

Furthermore, the laminated iron core may be used with the laminated thickness changed depending on its intended use, and if the same fluid pressure equipment and back pressure device are used, the stroke of the fluid pressure equipment may be changed to its maximum laminated thickness. It is necessary to set the stroke such that the stroke can be taken out, and even if the lamination thickness is less than that, the stroke is operated, resulting in unnecessary operation time and making it impossible to increase the speed of the press.

Therefore, the present invention provides a stopper to stop the rising end of the fluid pressure device from applying the rising pressure directly to the laminated iron core group driven into the die when the fluid pressure device is rising, and then the pressure is increased to a predetermined level. The iron core that is punched out at that station is then lowered to create back pressure due to the pressure of the fluid pressure equipment, producing a stable laminated iron core. A group of laminated iron cores that are driven into a die when the fluid pressure equipment is operated upward is secured by ensuring the minimum space from which the laminated iron core can be taken out depending on the laminated thickness of each of the laminated iron cores. After stopping the machine so that the pressure is not directly applied to the machine, the machine automatically switches to a predetermined pressure, and then creates a back pressure by the pressure of the fluid pressure equipment by lowering the iron core punched at that station. This is what I did.

[Effect]

When the fluid pressure equipment is in a rising position, the pedestal is stopped by a stopper so that the rising end does not directly apply the rising pressure to the laminated iron core group driven into the die, and then the pedestal is stopped when the rising pressure is applied to the fluid pressure equipment. The pressure increase is set to a predetermined pressure, and then the iron core punched at the station is lowered to push down the pedestal, and the back pressure of the fluid pressure equipment is applied to the pedestal to form a stable laminated iron core. Manufacture.

〔Example〕

Hereinafter, a method of pressing an iron core according to the present invention will be explained based on the accompanying drawings.

Fig. 1 shows an example of the press working process for laminated iron core processing of iron core plates. , the process of providing the caulking protrusions 2 for laminating the iron core at the position of point A and the position of point D is to separate the laminated and fixed pieces at the position of point B in front of point A and the position of point E in front of point D. The process of knocking off caulking protrusions is performed intermittently depending on the laminated thickness.

In addition to the above method, there is also a processing method in which the caulking protrusions are intermittently shot off at the positions where the caulking protrusions 2 are provided, depending on the laminated thickness.

In addition, at the 0 point position and the F point position, the outer diameter is punched to obtain the iron core 1', and the iron core 1', which has been previously punched in the die 3 due to the outer diameter punching, is The lamination and fixation of the iron core 1' is performed by the interfitting and caulking action of the caulking protrusions 2 provided at the machining positions of point and point D.

As shown in FIG. 2, a cradle 6 that is raised and lowered by a fluid pressure device 5 is provided below the primary caulking ring 4 that overlaps the lower side of the die 3, and a cradle 6 that is raised and lowered by a fluid pressure device 5 is provided on the lower surface of the secondary caulking ring 4. The upper limit stopper 7 of the pedestal 6 that the raised pedestal 6 comes into contact with is set.
to impose.

The pedestal 6 is raised by the action of the fluid pressure device 5, and at its rising end, the lowest laminated product 1'' is sequentially punched out by the punch 8 and is lowered by the iron core 1' which descends inside the die 3. Avoid contact.

In addition, the fluid pressure device 5 at the rising end of the pedestal 6 is set to a predetermined back pressure, and if more pressure is applied, the fluid is returned to the pressure leak circuit, ensuring a stable back pressure. It's starting to gain pressure.

〔effect〕

As described above, according to the method for pressing an iron core according to the present invention, the pedestal raised by the fluid pressure device is brought into contact with the stopper so that the pressure is not directly applied to the laminate, and the above-mentioned Since the pressure of the fluid pressure device is set to a predetermined back pressure upon contact, the increased pressure of the fluid pressure device does not act on the iron core group in the die.

For this reason, troubles in press working have been solved.

When the iron core plate 1 stops at the die 3, the outer diameter punch 8, which descends toward the die 3, punches out the iron core 1' from the iron core plate 1 into the die 3.

By repeating the above steps, the iron cores 1' are punched out one after another, and the punched iron cores 1' have resistance due to the previously punched iron cores 1' and the primary caulking ring 4, as shown in FIG. Then, the protrusions 2 are press-fitted together with the back pressure of the pedestal 6 whose upper surface is in contact with the lower surface of the lowest iron core 1', thereby stacking them.

The iron core laminated product 1'' processed to a predetermined lamination thickness is lowered to the take-out position together with the cradle 6 as shown in FIG. The veneer plate 10 is moved forward and the laminated product 1'' on the pedestal 6 is taken out.

When the removal of the laminated product 1'' is completed, the removal cylinder 9 is contracted to retract the veneer 10, and the fluid pressure device 5 is then extended to receive the laminated product 1'', and it is also possible to significantly speed up the pressing process. becomes.

[Brief explanation of the drawing]

The drawings show an embodiment of the iron core pressing method according to the present invention, and FIG. 1 is a plan view of the iron core pressing process;
FIGS. 2 to 4 are longitudinal sectional side views showing the removal of the iron core laminate. 1... Iron core plate, 1'... Iron core, 1''... Laminated product, 2... Protrusion, 3... Die , 4・・・・・・−
Next caulking ring, 5...Fluid pressure equipment, 6.
...cradle, 7...stopper,
8...Punch, 9...Take-out cylinder, 10...Piece plate.

Claims (1)

[Claims] (1) Providing caulking protrusions on the iron core plate of the punched material, then punching out the part including the protrusions to obtain an iron core, and stacking the iron cores by press-fitting the protrusions with each other in this punching stage, When this is repeated in sequence and a predetermined press stroke is made, the outer shape of the iron core plate with the caulking protrusion removed is removed, and the iron cores that have been laminated on that stage up to that point are separated without caulking. In an iron core pressing method in which the laminated thickness of the laminated iron core can be determined by forming a surface, a group of laminated iron cores is placed below the die of a stage where the outer shape of the iron core is cut out and the mutual fitting and caulking is performed. A fluid pressure device is provided on the cradle to apply a pressure opposite to the downward movement of the cradle by the descending stroker of the punch, and an upper limit stopper for the cradle is provided above the fluid pressure device. When the machine is working upwards, the pressure is stopped so as not to directly apply the pressure to the group of laminated iron cores driven into the die, and then the pressure is automatically switched to a predetermined level. An iron core pressing method characterized in that back pressure is created by the pressure of a fluid pressure device by lowering the iron core.