JPH0227048B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a progressive die device for manufacturing a laminated core, and more particularly to a progressive die device configured to simultaneously perform lamination and caulking in the core outer diameter punching process.

Conventionally, in the lamination caulking method in this type of mold equipment, the adjacent thin iron core sheets are separated by frictional resistance between the thin iron core sheets drawn into the outer diameter punching die and the inner peripheral surface of the die and the downward pressure of the punch. As disclosed in Japanese Patent Publication No. 55-11940, etc., there is a method of laminating the caulking projections formed in the die by applying a constant caulking pressure upward from the bottom of the die. A method is known in which thin iron core plates are received and the caulking protrusions formed on adjacent thin iron core plates are engaged with each other by the descending pressure of a punch to laminate the iron core thin plates.

However, among these conventional methods, the former has the disadvantage that the caulking force is small and it is difficult to keep the laminated thickness of the product within a certain range, making it impossible to obtain uniformity of the product. In addition, in the latter case, a constant pressure is always applied from the lower part of the outer diameter punching die to the lower surface of the thin core plate that has been drawn out, so if this upward pressing force is large, the thin core plate that has been drawn out will be pushed upwards. There is a risk that the product will push up and cause an unexpected situation, and in order to prevent this danger, there are many problems that need to be solved in implementation, such as the complexity of the structure, the increase in size, and the complexity of control. It was hot.

Under these circumstances, the applicant of this application first filed the
A mold device was proposed in Patent Application No. 19411 (see Japanese Patent Application Laid-open No. 138526/1983). This mold device includes a pressure pad that comes into contact with the lower surface of the die and a fluid pressure operating means that actively presses the pressure pad toward the lower surface of the die during the core outer diameter punching and lamination caulking process of the progressive mold device for manufacturing laminated cores. and means for detecting contact and separation of the pressure pad from the lower surface of the die, and means for controlling the operation of the fluid pressure actuating means based on the output signal of the detection means, and after laminating a predetermined number of sheets into the die portion, , which is characterized by temporarily applying re-caulking force to the laminated iron core, and compared to the conventional device described above, double caulking suppresses the laminated thickness of the product within a certain range and improves the uniformity of the product. However, in this device, the iron core thin plate is drawn into the die part, and when it is full, the pressure pad pressing the lower surface of the die by the pressing force of the fluid pressure actuating means prevents the punch from descending. Only once when the core is pushed down by the fluid pressure actuator, a force equivalent to the pressing force of the fluid pressure actuating means is applied as a re-caulking force to the core stacked inside the die. It was more difficult to keep it within a certain range. The reason for this was that sufficient pressing force could not be obtained due to the short pressurizing time required for re-caulking.

Therefore, the present invention further improves the mold device of the above-mentioned Japanese Patent Application No. 57-19411 (see Japanese Patent Application Laid-open No. 58-138526), and provides sufficient caulking force to create a laminated layer with a highly uniform laminated thickness. A pressure pad that comes into contact with the lower surface of the die during the core outer diameter punching and lamination caulking process of the progressive mold device for manufacturing laminated cores.
fluid pressure operating means for holding the pressure pad in contact with the lower surface of the die; means for detecting contact and separation of the pressure pad from the lower surface of the die; It has a means for setting and counting the number of press strokes after the presser pad is separated, and a re-caulking force setting means attached to the fluid pressure actuating means, and has a means for setting and counting the number of press strokes after the presser pad is separated, and a means for setting a re-caulking force attached to the fluid pressure actuating means, and is configured to adjust the downward pressure of the punch for each stroke at the set number of strokes. The present invention is characterized in that a set re-caulking force is applied to the core thin plates laminated inside the die portion in response to this, and details thereof will be explained below with reference to drawings showing embodiments.

First, FIG. 1 shows a partial cross-sectional front view of the entire mold apparatus according to the present invention, and this mold apparatus shows a progressive mold consisting of five steps (stations) 1st to 5th. The structure is such that punching of the outer diameter of the iron core and lamination and caulking work are performed at the step. Since the first to fourth steps are the same as the conventionally known structure, the explanation will be omitted, and the fifth step, which is a characteristic part of the present invention, will be explained in more detail.

As shown in FIG. 2, the die part 1 according to the embodiment of the present application includes a die 2 having an inner diameter 2a through which the thin iron core plate is extracted by a punch p, and an inner diameter located at the lower part of the die 2 and having the same diameter as the inner diameter 2a. 3a, and the squeeze ring 3 is fixed by press-fitting into the lower inner diameter side of the squeeze ring 3, and has an inner diameter 4a on the upper side of this inner diameter that is the same as the inner diameter 3a of the squeeze ring 3, and the diameter increases from the middle (in diameter). 0.02 mm) and a ring 4 having an inner diameter 4b. Furthermore, the bottom surface 3 of this squeeze ring 3
b (the lower surface of the die portion 1), the pressure pad 5 is always held in contact with the fluid pressure operating means 6 such as a hydraulic cylinder (described later). The squeeze ring 3
A proximity switch 7 is built in, and this detection end is the lower surface 3b of the squeeze ring 3 (the lower surface of the die part 1).
Pressure pad 5 from the bottom surface of die part 1
The sensor is configured to detect contact and separation of the sensor and transmit an output signal. Next, fluid pressure actuating means 6 such as a hydraulic cylinder
The control circuit will be explained from FIG.

This embodiment will be explained as a hydraulic cylinder.
Two passages a and b for supplying and discharging pressure oil to the piston side chambers 6a and 6b of the hydraulic cylinder 6 are respectively connected to the output port of the switching valve 8, and the supply port of the switching valve 8 is connected to the output port of the switching valve 8. Pressure source (tank) via pump 9
10. Furthermore, a two-way valve 11 such as a shut-off valve is connected in the middle of the passage a,
In addition, a relief valve 12 is connected to the side closer to the hydraulic cylinder 6 to constitute a control circuit, and the two-way valve 11 and the relief valve 12 constitute a repressurizing force setting means. In the figure, numeral 13 indicates a press stroke setting means for re-caulking, which sets and counts the number of cores punched into the die section 1 after the presser pad 5 is separated from the lower surface of the die.
Reference numeral 14 indicates a fluid pressure operating means for transporting the iron core, number 15 indicates a stopper, and number 16 indicates a proximity switch. When the hydraulic cylinder 6 is lowered by the operation of the switching valve 8, the lower surface of the pressure pad 5 comes into contact with the stopper 15. When pressed in contact, an output signal is sent to a control device (not shown) of the fluid pressure operating means 14 for carrying out the iron core.

The operation of the embodiment apparatus configured as described above will be further explained.

1 and 2, first, the two-way valve 11 is switched to block the passage a, and the piston chamber 6a of the hydraulic cylinder 6 and the relief valve 12 side connected to the piston chamber 6a are sealed, and the pressure pad 5 is closed.
is always held in contact with the lower surface 3b of the die portion 1.
Punching of the core is started from this state, and core thin plates are successively punched into the die 2 and laminated and caulked. (Fig. 3) When the amount of sheets laminated into the die part 1 is full and the next one is pulled out into the die 2, the pressing force of the punch p is applied to the pressure pad 5 through the thin iron core plate. , acts in a direction to push down the pressure pad. At the same time, the proximity switch 7 is turned on, an output signal is input to the setting means, and canting is started. Therefore, the piston of the hydraulic cylinder 6 is pushed down, and the pressure within the piston chamber 6a increases. The pressure inside this piston chamber 6a is the punch p
This is a reaction force that opposes the pressing force due to the lowering of the die portion 1, and is applied as a re-staking force to the iron core t stacked inside the die portion 1. The maximum reaction force is generated when the punch p descends to the lowest end (bottom dead center), so by setting the maximum pressure applied to the piston chamber 6a at this time in the relief valve 12, this set pressure can be adjusted. A corresponding reaction force can be applied to the iron core as a re-caulking force. Therefore, when the punch p descends to the bottom dead center and the pressure inside the piston chamber 6a rises above the set pressure, the relief valve 12 opens and the piston chamber 6a
The pressure oil in a is released to the tank side, the pressure in the piston chamber 6a drops rapidly, and the relief valve 1
2 is closed. Due to this relief operation, the pressure in the piston chamber 6a is configured to drop to the extent that it does not push upward due to the frictional resistance between the core thin plate t drawn into the die part 1 and the inner peripheral surface of the die.
Therefore, the upper surface of the pressure pad 5 is stopped at a position lowered by one core thin plate pushed down by the punch p (FIGS. 2 and 4).

In this manner, the press stroke operates in the same manner as described above for each set number of press strokes, and re-caulking pressure is applied to the core thin plates t laminated within the die portion 1. When the press stroke operation thus set is completed, a completion signal from the setting means 13 is input to the switching valve 8 and the two-way valve 11 to switch the flow path, and the piston chamber 6b of the hydraulic cylinder 6
Pressure oil flows into the piston chamber 6a through the passage b.
Return the oil inside to the tank and lower the piston.
At the same time, the pressure pad 5 also descends, and among the core thin plates t stacked inside the die part 1, the large diameter 4 inside the ring 4
One product located below part b descends together (Fig. 5). Next, when the lowered pressure pad 5 contacts the stopper 15 and further pushes down the stopper 15 slightly, the proximity switch 16 is turned on.
Then, an output signal is input to the control device (not shown) of the fluid pressure actuating means 14 for carrying out the iron core, and the fluid pressure actuating means 14 is advanced to eject the iron core thin plate t on the pressure pad to the side of the mold. (Figure 6). The hydraulic actuating means 14 is then retracted to its original position;
Subsequently, the hydraulic cylinder 6 rises and the pressure pad 5 comes into contact with the lower surface of the die part 1 again as shown in FIG. is pulled out and the above-mentioned operation is performed.

In this way, in the device of the present invention, the pressure pad 5 is configured so that it is always in contact with the lower surface of the die, that is, so that no strong upward pressing force is applied, and the pressure pad 5 is configured so that it does not exert a strong upward pressing force. The thin iron core plate is pulled out by the punch for each stroke for a predetermined press stroke, and a predetermined re-caulking force is applied to the thin iron core plate in the die portion in opposition to the downward pressing force of the punch until it reaches the bottom dead center. Therefore, compared to the known pedestal method that rises to the inside of the die, it is also compared to the patent application No. 19411 of 1984 (see Japanese Patent Application Laid-Open No. 138526/1983) proposed earlier by the applicant of the present application. , the crimping force can be much increased, and the laminated thickness of the product can therefore be made uniform with high precision.

Furthermore, it is a matter of course that the control of the laminated thickness of the iron core described in the earlier application described above can be carried out in the same manner. Further, in the embodiment of the present application, a proximity switch is used as the detection means, but changes such as using an eddy current type sensor are possible. Furthermore, since the re-caulking force and the number of times of re-caulking can be adjusted and set, it is possible to respond to changes in the shape of the product and can be used in a wide range of applications.Moreover, the structure is simple and an inexpensive device can be provided.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view showing the entire mold apparatus according to an embodiment of the present invention, and FIG. 2 is a line A-A in FIG. 1.
An enlarged cross-sectional view and FIGS. 3 to 6 are explanatory cross-sectional views showing the operating state in FIG. 2. (Explanation of symbols), 1...Die part, 2...Die,
3... Squeeze ring, 4... Ring, 5... Pressure pad, 6... Fluid pressure actuation means, 7...
Detection means (proximity switch), 8...Switching valve, 9...
...Pump, 10...Pressure source (tank), 11...
2-way valve, 12... Relief valve, 13... Press stroke number setting means for re-caulking, 14... Fluid pressure actuating means for carrying out iron core, 15... Stopper, 16...
...Proximity switch.

Claims (1)

[Scope of Claims] 1. In the core outer diameter punching and lamination caulking process of a progressive die device for manufacturing a laminated core, a pressure pad that comes into contact with the lower surface of the die, and a fluid pressure that maintains the pressure pad in contact with the lower surface of the die. an actuating means, a means for detecting contact and separation of the pressure pad from the lower surface of the die, and a means activated by an output signal of the detection means for setting and counting the number of press strokes after the pressure pad is separated from the lower surface of the die. and a re-caulking force setting means attached to the fluid pressure operating means, and the set re-caulking force is laminated into the die part against the downward pressure of the punch for each stroke in the set number of strokes. A mold device characterized in that it is configured to be added to an iron core. 2 Of the two passages for supplying and discharging fluid to and from the fluid pressure actuating means, a two-way valve connected to the middle of the passage on the supply side when bringing the pressure pad into contact with the lower surface of the die, and furthermore, The mold device according to claim 1, wherein the re-caulking force setting means is constituted by a relief valve connected to the means side.