JPS601858Y2 - Control device for preventing product defects in progressive mold equipment for laminated core manufacturing - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for preventing product defects in a mold device for manufacturing laminated iron cores.

In a progressive die device for manufacturing a laminated core, a counting circuit counts the number of press strokes, and based on this counted value, control is performed to switch the processing content at a specific station every predetermined number of strokes.

This applies to control at a station for machining cut and raised protrusions for joining (caulking) laminated core pieces together, a station for machining a counterbore of a rotor core, and the like.

N corresponding to the number N of core pieces constituting one laminated core
A process is performed in which the part of the cut and raised protrusion is completely pulled out at every stroke, and an iron core piece that has the hole where the cut and raised protrusion has been removed but does not have the cut and raised protrusion is obtained every N strokes.

Since there is no cut-and-raised protrusion, the iron core piece that was pulled into the gou before the iron core piece is not connected to the iron core piece.

In this way, the product laminated core is separated every N strokes of the press, and it is possible to obtain a product laminated core each consisting of N core pieces.

By the way, suppose that the liquid-added strip material is interrupted before the number of strokes reaches N strokes, and a new strip material is installed in the progressive mold device and the operation is restarted.

Even if the press is driven, actual processing is not performed at the specific station until the leading end of the strip material reaches a specific station (a station where the processing contents are switched according to the number of strokes) from the first station.

That is, the number of presses corresponding to the number of stations from the first station to the specific station is blanked.

The counting circuit also counts blank strokes, so if this is done, there will be a discrepancy between the number of strokes counted by the counting circuit and the actual number of machining operations.The switching of machining contents at a specific station is controlled based on the count value of the counting circuit. If this occurs, a defective product may be produced.

For example, the number N of iron core pieces constituting one product is 100
The number of specific stations from the first station to the specific station is 4, and the count value of the counting circuit is 98.
If a new strip material is attached at this time, the count value will be 100 = N when two strokes of blank firing are performed, and the cut and raised protrusion will be removed before the tip of the strip material reaches the specific station. will be carried out.

Thereafter, two more strokes are performed before the tip of the strip material reaches a specific station.

At this time, the count value of the counting circuit is 2 (102-100=2
), and after that, when 9 pieces of the iron core are processed, the count value becomes 100=N, and the cut-and-raise protrusion is removed.

Therefore, a defective product is created in which 1.98+98=196 core pieces are combined.

This invention was developed to eliminate the above-mentioned drawbacks, and when the number of press strokes is counted by a counting circuit and the processing content at a specific station is changed for each predetermined stroke based on this counted value, it is possible to When a new strip material is installed in the mold device, the count value of the counting circuit is corrected by the number of stations from the first station to the specific station, and the count value of the counting circuit and the actual number of processing times are corrected. This prevents any misalignment between the two and thereby prevents product defects.

The present invention will be explained in detail below based on the embodiments shown in the accompanying drawings.

FIG. 1 shows an example of the processing contents at each station I to {circle around (2)} of a progressive mold apparatus for manufacturing a rotor core, and reference numeral 51 indicates a strip material.

At the first (first) station I, a skew escape round hole 52 and a pilot hole 53 are bored.

At the second station (2), a shaft hole 54 and a slot 55 are bored.

At the third station (2), a cut and raised projection 56 is formed.

Due to the structure of the mold, the fourth station (2) is an idle station for maintaining strength and no processing is performed, and the fifth station (2) performs outline cutting, caulking, and skew processing.

After this, the stator core core piece is machined at the outer side of the rotor core core piece removal hole 57 of the strip 1, but this point is not shown.

The stations where the machining contents are switched every predetermined number of strokes are the second station ■ and the third station ■. In the second station ■, the diameter of the shaft hole 54 is changed, and in the third station ■, the cut and raised protrusion 56 is left. Sometimes machining is performed that causes the parts to fall off without being removed.

Fig. 2 and 3 regarding processing at the 3rd station ■
This will be explained with reference to the figures.

The punch 58 at the third station (3) has a cutting edge 58a at the lower end having a shape necessary for forming the protrusion 56, and an upper end, which becomes the base, is formed into a protruding portion 60 in the punch holder 59. .

This cam portion 60 is a tapered cam, and is always in contact with a cam 62 that is driven forward and backward by a solenoid 61 attached to the punch holder 59.

When the punch holder 59, which reciprocates up and down with the press stroke, descends to the lowest end, the cutting edge 58a of the punch 58 presses the strip 51 on the stripper 63.
protrudes from the underside of the

The amount of protrusion is changed by a solenoid 61.

When the solenoid 61 is deenergized, a cut and raised protrusion 56 having a predetermined protrusion amount is formed as shown in FIG. 3a.

When the solenoid 61 is energized, the cam 62 moves forward to push down the punch 58, and as shown in FIG. 3, the cut and raised projection 56 is pulled out.

The solenoid 61 is energized every N strokes corresponding to the number N of core pieces constituting one product laminated core.

In order to understand the outline cutting and crimping processing, the processing contents of station (2) will be explained with reference to FIG.

Die 1 in this station ■ is bearings 2 and 3.
The sprocket 4 is rotatable by the intervention of the sprocket 4, and a sprocket 4 is attached to the outer periphery of the sprocket.

A link chain (not shown) is hung on the sprocket 4, and this link chain is connected to the indexing means (
(not shown), the sprocket 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 designates a punch (blanking die) for punching out the outer shape provided in the upper mold, 51 represents a strip, and 7 represents laminated core pieces punched and stacked in the die 1.

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

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

During press working, pressure is applied to a given bridge by a cylinder 9 to prevent the platform 8 from lowering due to the weight of the laminated iron core and the impact of pressurization. When the laminated core piece is pushed down, it will go down by that amount.

Reference numeral 27 is a rod of the cylinder 9.

In FIG. 4, the cylinder 28 is placed horizontally at the bottom of the mold.
is a cylinder for taking out the product laminated core (feeding it out in the lateral direction), and when the cylinder 9 descends to take out the product and reaches the predetermined product take-out position, the rod 29 is extended and the receiver is placed in one piece on the stand 8. Passage 3 for taking out the product laminated core
Push to 0.

On the other hand, the part of the strip 51 that has reached the die 1 at station (2) has a cut protrusion 56 and a skew escape round hole 5.
2 is provided.

When the punch 5 is pressed down with the press stroke, the outer shape of the iron core piece 7 is punched out along the punching trace 57 shown in FIG.

The cut and raised protrusions 56 of the core piece 7 whose outer shape has been cut out fit tightly into the raised marks of the cut and raised protrusions 56 of the laminated core piece that has been previously drawn into the die 1, so that the stacked iron core pieces are mutually separated. They are caulked together.

Note that the laminated core piece 7' in contact with the base 8 of the receiver does not have a cut-and-raised protrusion 56, but a cut-out mark of the cut-and-raised protrusion 56 is formed.

For example, if one product laminated core is made up of N core pieces, and the amount of protrusion of the cut and raised protrusions 56 is the thickness of one plate, at the cut and raised protrusion forming station (1), 1
For the second laminated core piece, no cut-and-raised protrusion 56 is formed, and only the punching trace is formed, and from the second to the Nth piece (
Cut and raised protrusions 56 are formed on N-1) laminated core pieces.

Therefore, the core pieces 7' without the protrusions 56 are obtained by cutting and raising every N pieces.

The process of removing the cut-and-raised protrusion 56 is a "full cut" process.
That's what it means.

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 56, 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.

In addition, when the protrusion amount of the cut and raised protrusion 56 is the thickness of 2 sheets or n sheets, "all cuts" are performed for the 1st and 2nd core pieces or the 1st to nth core pieces. , cut and raised protrusions 56 are provided on the third to N-th core pieces or the (n+1)-th to N-th core pieces.

FIG. 5 is a block diagram showing an embodiment of the present invention, and shows a control system that performs total cutting control according to the number of press strokes.

The press stroke signal is a signal that generates one pulse for every one stroke of the press, and the counting circuit 64 counts the number of press strokes in response to this stroke signal.

The counting circuit 64 is modulo N (N is the number of core pieces constituting one product).

The counting output C of the counting circuit 64 is supplied to a complete cut control circuit 65.

The total cut control circuit 65 energizes the solenoid 61 (see FIG. 2) when C=N.

Therefore, a complete cut is performed every N strokes.

In addition, when the protrusion amount of the cut and raised protrusion 56 is equivalent to the thickness of n plates, the control circuit 65 for total cutting is such that the count value C is N≦C≦N+n.
-1, the solenoid 61 is energized.

Since the count value C is modulo N, N22, N0n-1
=n-1.

By the way, the number of stations from the first station I to the third station ■ is 2, and when a new strip 51 is installed, it will take two blank strikes before the tip of the strip 51 reaches the third station ■. be.

The strip material replacement detection circuit 66 is a circuit that detects that a new strip material has been installed, and may be configured to automatically detect this, or may be configured to detect this automatically by manual operation of a switch or the like when the strip material is installed. It may be configured to generate a detection signal.

The new strip installation detection signal outputted from the detection circuit 66 is applied to a numerical value correction circuit 67, and the circuit 67 generates a numerical value for correction.

The numerical correction circuit 67 adjusts the number "2" corresponding to the number of stations from the first station ■ to the third station ■.
is supplied to the counting circuit 64, and 2 is subtracted from the current count value of the counting circuit 64.

In this way, the count output C of the counting circuit 64 has 2
'A value corrected for one stroke is obtained.

Therefore, the actual number of machining operations at the third station (2) exactly matches the count value of the counting circuit 64, and accurate total cutting control can be performed.

Incidentally, the same control as described above is performed also when machining the shaft hole 54 at the second station (2).

Out of the N core pieces that make up one product, the shaft holes 54 of the core pieces from the 1st to the Therefore, in the second station (2), the size of the shaft hole 54 must be controlled to be changed according to the number of press strokes.

For this, a large-diameter punch (not shown) and a small-diameter punch (not shown) are placed concentrically at the second station ■, and the large-diameter shaft hole 54 is punched out using both the large-diameter punch and the small-diameter punch. The shaft hole 54 may be punched out using only a small diameter punch.

This switching can be performed by controlling one solenoid (not shown) in the same way as in the case of total cutting.

The control circuit configuration is almost the same as that shown in FIG. 5, but the value of the correction value is set to be the difference between the first station and the second station, and the range of the count value for energizing the solenoid is determined as appropriate.

In addition, when the counting circuit is shared with the one for total cut control 64, as shown in FIG.
A circuit 68 performs correction by adding the station difference "1" to the output C of the counting circuit 64, and provides the corrected value C+1 to the machining control circuit 69 for the shaft hole 54.

As explained above, according to the present invention, accurate control can be performed in the progressive mold device, and product defects can be prevented.

[Brief explanation of the drawings] Fig. 1 is a front view of a liquid-added strip material showing an example of processing at each station I to ■ in a progressive mold device for manufacturing laminated iron cores, and Fig. 2 is a front view of a punch for machining cut-and-raise protrusions. A schematic longitudinal sectional view of the mechanism; FIG. 3a is an enlarged longitudinal sectional view showing the cut and raised protrusion processing state; FIG. 3 is an enlarged longitudinal sectional view showing the removal of the cut and raised protrusion; The figure is a vertical cross-sectional view showing the mold mechanism of the station for cutting out the outer shape of the laminated core piece, hooking and skewing it, FIG. 5 is an electrical block diagram showing one embodiment of the present invention, and FIG. FIG. 2 is a block diagram showing an example of a circuit added to the. 1... Gui, 5. J8・・・・・・Punch, 7
, 7'... Laminated core piece, 8... Receiver is stand, 51... Strip, 54... Shaft hole, 56... Cut and raised projection, 59... Punch holder, 60, 62... Cam, 61...
... Solenoid, 64... Counting circuit, 67...
...Numerical correction circuit.

Claims (1)

[Scope of utility model registration request] In a control device for a progressive mold device for manufacturing a laminated iron core, the control device for a progressive mold device for manufacturing a laminated iron core is configured to count the number of press strokes in a counting circuit and control switching of processing contents at a specific station among a plurality of stations based on the counted value. When a new liquid strip material is installed on the
A progressive mold for manufacturing a laminated iron core, comprising a circuit for correcting the count value of the counting circuit by the number corresponding to the position of the specific station in the station row, and correcting the discrepancy between the number of press strokes and the actual number of processing operations. Control device for preventing product defects in equipment.