JPS585735B2 - Product ejecting device in progressive mold device for laminated core manufacturing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a product take-out device in a progressive mold device for manufacturing laminated iron cores.

In a progressive die device for manufacturing a laminated core, at a station for cutting out the outer shape of a laminated core piece from a strip, the laminated core piece is drawn into a lower die for outer shape cutting, and the previously drawn die in the die is It is crimped together with the laminated core pieces to join them.

The laminated core manufactured by this method has the cut and raised protrusions of the laminated core piece that is later drawn out in the hole that is the cut and raised protrusion trace of the laminated core piece that has been punched out and placed in the die. It is press-fitted and caulked to join together.

In addition, although the above laminated core pieces are cut and raised every predetermined number of pieces, and although there are no protrusions, there are holes where the cut and raised protrusions remain. The laminated core piece that is pulled into the die and the subsequent pieces that are pulled out following the laminated core piece become uncoupled due to the presence of the laminated core piece.

That is, the laminated core pieces without cut and raised protrusions are placed at the lowest position, and the laminated core pieces that are pulled out until the next laminated core piece without cut and raised protrusions are combined together. It becomes one product laminated core.

A device for taking out the product laminated core from the bottom of the die in such a mold device is disclosed in Japanese Patent Application No. 50-1262.
There is one shown in the specification of No. 01.

This allows the product holder to be tilted, and when the cylinder supporting the holder is retracted, the holder is tilted at a predetermined position below the lower mold, allowing the product on the holder to fall naturally into the chute. This is what I did.

However, oil-based dirt, etc. may cause the product to stick to the pedestal and prevent it from falling naturally.Also, since the pedestal that has been tilted is returned to its original horizontal position by the gravitational moment, the product may not tilt back to its original position. Sometimes it remained.

In addition, since the product is removed from the bottom of the press through a long chute, the product may break during the process.Furthermore, if the chute is clogged with broken product, the clogging will not be noticed until the chute is filled with product, resulting in a blockage. Another drawback is that it takes time to notice.

In addition, since the cylinder for supporting the pedestal must be retracted to the bottom of the press in order to tilt the pedestal, the stroke of the cylinder becomes long, and there is also the problem that it takes time to take out the product.

This invention has been made in view of the above-mentioned points, and the present invention has been made in view of the above-mentioned points. A product extrusion actuator is installed in the mold on the opposite side of this passage across the die interior space, and when taking out the product, the pedestal supporting cylinder is retracted according to a predetermined procedure to take out the product on the pedestal. It is an object of the present invention to provide a product take-out device that descends to a position corresponding to a passage and extends a product pushing actuator to push out the product on a pedestal into a take-out passage.

Since the product is actively pushed out by the push-out actuator, clogging of the product in the take-out passage is less likely to occur.

Furthermore, even if the product becomes clogged, the clog can be noticed immediately from the extended state of the actuator.

In addition, since the product is ejected (extruded) within the lower mold rather than from below the press device as in the past, the stroke of the cylinder supporting the pedestal is shortened, contributing to faster product ejection work.

By the way, after the product on the pedestal is pushed out, the empty pedestal must be raised until it comes into contact with a laminated core piece that is closely held on the inner periphery of the die to receive the product.

For this purpose, the pedestal supporting cylinder must be extended to a position where the laminated core pieces abut against the pedestal.

That is, the cylinder stops expanding when the laminated core pieces come into contact with the cradle.

Conventionally, a switch was provided at a fixed position, and when the cylinder was extended by a predetermined amount, the extension was controlled to be stopped based on the operation of this switch.

However, if the thickness of the product changes, the amount by which the pedestal rises until it comes into contact with the laminated core piece also changes, causing the trouble of having to change the mounting position of the switch.

Therefore, in the present invention, the above problem is solved by providing a sensor on the side of the pedestal supporting cylinder that detects when an object comes into contact with the pedestal.

An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a cross-sectional view showing a station for outline cutting, caulking, and skewing of a core piece for a rotor core in a progressive die device for manufacturing a laminated core.

The die 1 at this station is rotatable through bearings 2 and 3, and a sprocket 4 is attached to its outer periphery.

A link chain (not shown) is hung on the sprocket 4, and this link chain is connected to the indexing means (
(not shown), the subrocket 4 (that is, the die 1) is rotated by an angle corresponding to the skew amount for each stroke of the press.

Reference numeral 5 indicates a punch (planking die) for punching out the outer shape provided in the upper mold, 6 indicates a strip, and 7 indicates laminated core pieces punched and stacked in the die 1.

A pedestal 8 supported by a hydraulic cylinder 9 is provided within the die 1 .

A layer of laminated core pieces 7 punched out by the punch 5 is placed on the pedestal 8.

During press working, a predetermined receiving pressure is applied by the cylinder 9 to prevent the pedestal 8 from lowering due to the weight of the laminated core and the impact at the time of pressing. When the iron core piece is pushed down, it will go down by that amount.

Reference numeral 27 is the rond of cylinder 9.

A product take-out passage 30 is provided in the lower part of the lower die and extends laterally into a space for inserting a laminated core piece in the die 1.

The product extrusion actuator 28 is provided on the opposite side of the passage 30 across the laminated core piece insertion space in the die 1, and is arranged so as to be able to expand and contract the rond 29 in the direction of the passage 30. .

For example, an air cylinder is used as the product extrusion actuator 28.

However, the present invention is not limited thereto, and a hydraulic cylinder, an electric linear actuator, or the like may also be used.

The cylinder 9 for supporting the pedestal is a double-rod type cylinder, and a first sensor LS1 and a second sensor LS2 are provided at predetermined fixed positions. A third sensor LS3 is attached to detect that the (laminated core piece) has abutted.

The first sensor LS1 detects that the pedestal 8 has descended to a predetermined lower limit position corresponding to the take-out passage 30, and the bottom surface of the passage 30 and the upper surface of the pedestal 8 reach the predetermined lower limit position. The height is the same, or the height is such that the top surface of the pedestal 8 is somewhat higher.

The second sensor LS2 is for detecting that the pedestal 8 has risen beyond a predetermined safe raised position set above the lower limit position.

An example of the third sensor LS3 is shown in FIG.

The rods 27, 27' of the cylinder 9 have a hollow cylindrical shape, and a small rod 38 is inserted into the cylinder.

The upper end of the small iron 38 is connected to the pedestal 8, and the lower part thereof faces the actuator 36A of the microswitch 36.

The microswitch 36 is fixed to the lower rod 27', and moves up and down once along with the rod 27' as the cylinder 9 expands and contracts.

A spring 37 is arranged between the upper end of the upper rod 27 and the pedestal 8.

When no load is applied to the pedestal 8, the rod 27 and the pedestal 8 are separated by the repulsive force of the spring 37, as shown in FIG. Do not apply pressure to 36A.

Therefore, the microswitch 36 is off (that is, the third sensor LS3 is off).

When the laminated core piece comes into contact with the pedestal 8, the spring 37 contracts,
The pedestal 8 is lowered until it hits the upper end of the rond 27.

That is, the pedestal 8 and the small iron 38 are lowered relative to the rods 27, 27', and the lower end of the small iron 38 presses the actuator 36A of the microswitch 36.

This turns on the microswitch 36 (that is, the third
sensor LS3 is turned on), and it is detected that an object has come into contact with the cradle 8.

On the other hand, a fourth sensor LS4 and a fifth sensor LS5 are provided in connection with the product extrusion actuator 28.

The fourth sensor LS4 is for detecting the extension limit position of the actuator 28, and the fifth sensor LS5 is for detecting the retraction limit position of the actuator 28.

The sensors LS1 to LS5 may be microswitches, or may be contact or non-contact limit switches or proximity detection switches.

FIG. 3 schematically shows the relationship between the position of the pedestal 8 and the on/off state of the sensors LS1 to LS3, and the position of the tip of the rod 29 of the actuator 28 and the on/on state of the sensors LS4 and LS5.

Incidentally, the portion of the strip 6 that has reached the die 1 for cutting the outer shape of the core piece of the rotor core is provided with cut protrusions 31 and slots 32 at appropriate pre-process positions as shown in FIGS. 4 and 5. ing.

The cut and raised projection 31 consists of an inclined part 31a and a horizontal part 31b, and a round hole 34 is provided at the tip thereof.

This round hole 34 is a relief hole at the tip of the horizontal portion 31b of the cut-and-raised protrusion 31 of the laminated core pieces 1 stacked on top, and thereby enables skewing.

The cut and raised protrusions 31 of the laminated core pieces 7 stacked above are tightly inserted into the voids in the laminated core pieces 7 created by the cut and raised protrusions 31, thereby caulking the stacked laminated core pieces together (tightening). ).

For this "caulking", the pressurizing force of the punch 5 and the "receiving pressure" via the cylinder 9 and the pedestal 8 act.

Note that the laminated core piece 7' in contact with the pedestal 8 does not have a cut-and-raised protrusion 31, and a hole 33 (see FIG. 5) is formed as a trace of the cut-and-raised protrusion 31.

For example, if one product laminated core is made up of N core pieces, at the cut-and-raise protrusion forming station,
For the first laminated core piece, a cut-and-raised protrusion 31 is not formed, but a hole 33 is formed as the punched part, and for the second to N-th (N-1) laminated core pieces, the cut and raised protrusion 31 is not formed. Raising protrusion 31
form.

Therefore, an iron core piece 7' having only a hole 33 without a protrusion 31 is obtained by cutting and raising every N pieces.

The process of removing the cut-and-raised protrusion 31 to leave only the hole 33 is called "total cut."

In other words, "total cutting" is performed for each number of core pieces constituting one product.

The core piece 7' that has been completely cut becomes the lowest core piece of the product laminated core.

In other words, since this core piece 7' does not have the cut-and-raised protrusion 31, it is separated from the core piece 7 without being caulked to the core piece 7 which was previously cut out in the die 1.

Therefore, in the process of continuous outline cutting and caulking in the die 1, each product is automatically separated.

Note that the inner diameter of the die 1 matches the outer diameter of the core piece 1 only at the upper part, and is slightly wider than the outer diameter of the core piece 7 at the lower part.

Therefore, the periphery of the laminated core piece drawn into the die 1 is initially in pressure contact with the inner periphery of the die 1, but as more core pieces are drawn on top of it, it gradually descends. , it eventually reaches a position where it does not come into contact with the inner periphery of the die 1 (a portion with a wide inner diameter).

Therefore, if the pedestal 8 is lowered at an appropriate point when one product laminated core is no longer in contact with the inner circumferential surface of the die 1, only the one product laminated core placed on the pedestal 8 will be removed from the pedestal. 8 to a position corresponding to the take-out passage 30.

After pushing this product out into the passage 30, when the pedestal 8 is raised, its periphery comes into pressure contact with the inner peripheral surface of the upper part of the die 1, and the lowermost part of the product laminated core (cut) which has stopped without falling down is removed. The pedestal 8 comes into contact with the iron core piece 7' (without the protrusion 31).

The upper port 9a and lower port 9b of the cylinder 9 are connected to a fluid pressure circuit 39, which is shown in detail in FIG.

In this example, a hydraulic cylinder is used as the cylinder 9.

The fluid pressure circuit shown in FIG. 6 consists of a receiving pressure recovery circuit 10 and a cylinder vertical drive circuit 11.

The received pressure generation circuit 10 is connected to the lower port 9b of the cylinder 9.
A check valve 12 is arranged so as to form a flow path from the top port 9a to the top port 9a, a relief valve 13 is provided on the bottom port 9b side and operates at a predetermined P1, A predetermined pressure fluid supply circuit 14 is provided for supplying fluid (pressure oil) at a predetermined pressure P2 to the port 9b side.

The predetermined pressure fluid supply circuit 14 includes a motor 15, a pump 16, and a relief valve 17 for feeding pressure oil at a predetermined pressure P2.
It includes a two-position solenoid valve 18 for switching the supply of pressure oil, and a check valve 19 provided between the lower port 9b of the cylinder 9 and the solenoid valve 18.

The cylinder vertical drive circuit 11 includes a pilot type check valve 2
Upper ports 9a and 9b of cylinder 9 via 0,21
A circuit for supplying pressure oil at a predetermined pressure P3 consisting of a motor 22, a pump 23, a relief valve 24, and an accumulator 25, and a three-position solenoid valve 26 for switching the supply of pressure oil to the cylinder 9. It is equipped with

Port 26a of electromagnetic valve 26 is connected to upper port 9a of cylinder 9 via check valve 20, and port 26b is connected to lower port 9b via check valve 21.

The fluid pressure circuit shown in FIG. 6 has the following three states, which are determined by the positions of the solenoid valves 18 and 26.

In the "received pressure generation state", solenoids SOL1 to SOL
All OLs 3 are deenergized and the solenoid valves 18, 26 are placed in neutral positions 18A, 26B as shown.

Therefore, the predetermined pressure fluid supply circuit 14 is activated, and the pressure oil of the predetermined pressure P2 is supplied to the position 18A of the solenoid valve 18 and the check valve 1.
9 to the lower port 9b side of the cylinder 9 (that is, to the upper port 9a side and the relief valve 13 side via the check valve 12).

Furthermore, since the solenoid valve 18 is positioned at 18A, pilot pressure is not applied to the pilot check valves 20 and 21, and flows into the vertical drive fluid pressure circuit 11 from the upper port 9a and lower port 9b of the cylinder 9. The flow path is a check valve 20
, 21.

From the cylinder vertical drive fluid pressure circuit 11, only pressure oil at a predetermined pressure P3 can be supplied to the upper port 9a of the cylinder 9 via the port 26a1 and the check valve 20.

Note that the relationship between the pressure P2 in the predetermined pressure fluid supply circuit 14 and the operating pressure P1 of the relief valve 13 is such that the pressure P1 is equal to or greater than the pressure P1 to some extent.

Moreover, the pressure P3 in the circuit 11 is smaller than P1 and P2.

(To give an example, P1 is 150Kg/cm2, P2 is 1
00KP/cm2, P3 is about 20Kg/cm2.

) In the "cylinder up state", solenoid SOL1
and SOL2 are energized, and solenoid valve 18.26 is in position 18B.
, 26A.

Therefore, the predetermined pressure fluid supply circuit 14 becomes inoperative,
Pressure oil at the predetermined pressure P2 is not supplied to the lower port 9b (and the upper port 9a via the check valve 12).

”However, the pilot type check valves 20 and 21 are equipped with a solenoid valve 18.
Pilot pressure is applied to the valves 20 and 21, and the valves 20 and 21 are opened in both directions.

Therefore, pressure oil is supplied from the position 26A of the electromagnetic valve 26 to the lower port 9b of the cylinder 9, and the pressure oil is returned from the upper port 9a via the open check valve 20.

In this way, the piston rod 27 of the cylinder 9 is raised.

In the "cylinder lowering state", solenoids SOL1 and SOL3 are energized, and conversely to the above, the solenoid valve 26 is at position 26.
C, the rod 27 of the cylinder 9 is lowered.

Control of cylinder 9, that is, solenoids SOL1, SOL
2. Control of the SOL 3 and the product extrusion actuator 28 are performed by a sequence control circuit 40.

An example of sequence control of the progressive mold apparatus by this sequence control circuit 40 is shown in FIG.

In FIG. 7, the sequence control of the progressive mold device is as follows:
It is roughly divided into a press working sequence and a product take-out sequence.

The press processing sequence is a control sequence when the press device is driven to manufacture the laminated core, and during this time, the fluid pressure circuit shown in FIG. 6 is set to the above-mentioned 1 receiving pressure generation state. .

The product removal sequence is a sequence for removing the product and is relevant to the subject matter of the present invention.

In the press processing sequence, the number of strokes of the press is counted, and when the stroke matches the number N of laminated core pieces constituting one product, the above-mentioned "all cut" processing is performed.

The sequence then moves to the product removal sequence.

First, the solenoids SOL1 and SOL3 are energized to bring the cylinder 9 into the "downward state".

Retraction of the rod 27 of the cylinder 9 lowers the pedestal 8 (and the product placed thereon).

When the first sensor LS1 is turned on, the solenoid SOL1
, SOL3 are deenergized, and the lowering of the pedestal 8 is stopped.

At this time, the product on the pedestal 8 is deflected to face the entrance of the take-out passage 30.

Actuator 28 is then extended and rod 29 forces the product on pedestal 8 into channel 30.

The actuator 28 until the fourth sensor LS4 turns on.
is expanded.

When the fourth sensor LS4 is turned on, the product has been pushed to the exit of the passageway 30, thus making it possible to add one product.

The actuator 28 is then retracted until the fifth sensor LS5 is turned on, returning to the original position shown in FIG.

When the fifth sensor LS5 turns on, solenoid SOL1
, SOL2 are energized, and the cylinder 9 enters the "raised state".

The pedestal 8, which has become empty after being loaded with products, rises with the extension of the rod 21, and when the third sensor LS3 turns on after the second sensor LS2 turns on, that is, from the predetermined safe raised position. When the pedestal 8 comes into contact with the lowest part of the product laminated core suspended on the upper inner circumferential surface of the die 1 at the upper position, the solenoids SOL1 and SOL2 are deenergized and the rising of the pedestal 8 is stopped.

In this way, with the pedestal 8 in contact with the lowest iron core piece 7' in the die 1, the cylinder 9 enters the "receiving pressure generation state" and returns to the press working sequence.

The configuration of the third sensor LS3 is not limited to the one using the small rod 38 as shown in FIG. 2, but may be one in which a proximity switch is attached to the pedestal 8.

In addition, the cradle 8 for the iron core piece for the rotor core is made of iron 21.
is rotatably supported.

This is to enable skewing processing.

Of course, the present invention can also be applied to product removal at a station for outline cutting and caulking of stator core pieces.

In that case, since skewing is not performed, there is no need to make the pedestal 8 rotatable with respect to the rod 27, and there is no need to make the die 1 rotatable, so the bearings 2, 3 and subrocket 4 also do not need to be made rotatable. Not necessary.

As explained above, according to the present invention, product clogging in the product removal passage is less likely to occur, and the stroke of the cylinder supporting the pedestal can be shortened, which helps speed up the product removal work. There is.

[Brief explanation of the drawing]

Fig. 1 shows an embodiment of the present invention, and Fig. 2 is a vertical cross-sectional view showing a station from which a product is taken out in a progressive mold device, and Fig. 2 shows a station for detecting that an object has come into contact with a cradle. FIG. 3 is a longitudinal cross-sectional view showing the outline of the configuration of the third sensor; FIG. 3 is a diagram schematically showing the operating positions of various sensors; FIG. 4 is a plan view showing an example of the strip portion immediately before outline cutting; FIG. FIG. 6 is an enlarged vertical cross-sectional view exaggerating the outline of the laminated core piece, caulking, and skew, and FIG. The figure is a flowchart showing the procedure of sequence control by the sequence control device. 1...Die, 5...Punch, 6...
...Strip, 7,7'...Laminated core piece,
8... Receiver, 9... Cylinder for supporting the cradle, 28... Actuator for pushing out the product, 30... Product take-out passage, LSI to LS5
・・・・・・Sensor.

Claims (1)

[Scope of Claims] 1. A die for punching laminated core pieces from a strip in which cut-and-raised protrusions of predetermined protrusions are provided at predetermined positions, and a die for punching laminated core pieces from each other as they are successively drawn into the die. In a progressive die device for manufacturing a laminated core, the product laminated core is caulked by the pressurizing force of a punch through the cut and raised protrusions when being pulled into the die to obtain a product laminated core. A cradle that receives the laminated core piece from below, a fluid pressure cylinder that supports the cradle, a product take-out passage provided in the lateral force direction at the bottom of the die and communicating with the die interior space, and a gooey interior space. A product extrusion actuator is provided on the opposite side of the passageway and arranged to be able to expand and contract in the direction of the passageway, and when the product is taken out, the cylinder is retracted so that the pedestal corresponds to the passageway. sequence control in which the actuator is lowered to a predetermined lower limit position, the actuator is extended to push out the product on the pedestal into the passage, the actuator is retracted, and the cylinder is then extended to raise the pedestal. A product removal device comprising a device. 2. The sequence control device includes a first sensor that detects that the pedestal has descended to the lower limit position, and a first sensor that detects that the pedestal has risen above a predetermined safe raising position that is set above the lower limit position. a second sensor that detects that the laminated core piece is in contact with the pedestal; a fourth sensor that detects the extension limit position of the actuator; The product increase according to claim 1, which includes a fifth sensor that detects a retraction limit position, and a sequence control circuit that controls the cylinder and actuator according to a predetermined procedure according to the signals from each of the sensors. Output device. 3. It has a die for punching the laminated core pieces from a strip in which cut and raised protrusions with a predetermined protrusion amount are provided at predetermined positions. In a progressive mold device for manufacturing laminated cores, the laminated cores that have been punched into the die and overlapped are caulked through the cut and raised protrusions to obtain a product laminated core by the pressurizing force of the punch during extraction. a pedestal that receives the pedestal from the pedestal; a fluid pressure cylinder that supports the pedestal; when increasing the number of products, the cylinder is retracted and the product on the pedestal that has been lowered accordingly is taken out, and the cylinder is then extended; A product comprising a control device and a detection means for detecting that an object has abutted on the pedestal, and when the abutment is detected by the detection means, the extension of the cylinder by the control device is stopped. Increase device. 4. The detection means includes a small rod that is inserted movably in the axial direction into the rond of the cylinder and whose tip end is connected to the holder, and a spring that is disposed between the holder and the rond of the cylinder. 4. The device for taking out a product according to claim 3, wherein the device is a detecting means comprising: and a switch that is activated in response to relative movement of the small rod with respect to the iron in the axial direction.