JPH0230772B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a molding device for a laminated iron core, and more particularly to a molding device for a laminated iron core that can adjust the laminated thickness of the laminated iron core to a desired thickness.

FIG. 1 is a sectional view showing an example of a mold device for a laminated core. This mold apparatus has a first station to a fifth station, and in the first station, as shown in FIG. 2, a skew escape round hole 2 and a pilot hole 3 are bored in the strip 1.
At the second station, a shaft hole 4 and a lotus slot 5 are bored. At the third station, a cut-and-raised protrusion extraction hole 6 and a cut-and-raised protrusion 7 (see Fig. 3 a, b) leading to the skew escape round hole 2 are formed, and as shown in Fig. 4 a, b. , cut and raised projection 7
Holes 6a corresponding to cut-and-raised protrusions are formed for each predetermined number of sheets. Due to the structure of the mold, the fourth station is an idle station for maintaining strength, and no processing is performed, and the fifth station performs outline cutting, caulking, and skew processing of the laminated iron core pieces 9 in the die 8.

As schematically shown in FIG. 5, the punch 10 in the third station has a lower cutting edge 10a formed in a shape necessary for forming the cut-and-raised protrusion 7, and an upper end serving as a base of a cam facing into the punch holder 11. It is formed in the section 12. This cam portion 12 is a tapered cam, and a cam 14 is driven forward and backward by a solenoid 13 attached to the punch holder 11.
is in constant contact with. When the vertically moving punch holder 11 descends to the lowest end, the cutting edge 10a of the punch 10 presses the strip 1.
The amount projected from the lower surface of 5 is the cut and raised protrusion 7.
When forming the holes 6 and 6, the protrusion 7 is maintained so that the protrusion does not exceed the thickness of the strip 1, but when the hole 6a is formed, the protrusion 7 is kept to protrude more than twice the thickness of the strip 1. (See Figures 6 and 7).

This change in the amount of protrusion is applied to the punch 10 by displacement of the cam 14. The time to increase the amount of protrusion of the punch 10 is when the press stroke is performed by the number of laminated core pieces 9 required for one laminated core.

At the fifth station, at each press stroke, the punch 16 punches the laminated core piece 9 having the cut and raised protrusions 7 into the die 8 from the portion indicated by the imaginary line 17 shown in FIG. It can be rotated by the amount corresponding to the amount. Note that detailed explanation thereof will be omitted here.

On the other hand, a cylinder 18 is provided within the die 8 . This cylinder 18 generates receiving pressure when punching and caulking with the punch 16, and descends by an amount equivalent to the thickness of the laminated core piece 9 each time it is caulked. is lowered to the extraction position. cylinder 18
When the cylinder 18 is lowered to the removal position, the product on the cylinder 18 is pushed out by another cylinder 19.

The mold device with the above configuration controls the stacking thickness of the product by forming holes 6a (Fig. 4) for non-coupling in the laminated core 9 for each predetermined number of sheets, so the thickness deviation of the strip 1 There is a problem with variations in the stacking thickness of the product. Incidentally, JIS standards allow a tolerance of ±10% for the thickness of electrical steel sheets used for electrical equipment, so the thickness of the laminated core can vary by up to 20%. On the other hand, a normal laminated core is formed by stacking 50 to 100 core pieces, so the plate thickness is 0.5 mm.
When manufacturing a product with a thickness of 50 mm by stacking 100 strips using a strip of It will end up being put away. This waste not only causes economic loss, but also has the negative effect of unstable product accuracy and characteristics.

On the other hand, a proximity switch detects the lowering position of the cylinder 18 when the laminated core piece 9 drawn into the die 8 reaches a desired stacking thickness. There is an idea to control the stacking thickness of the product by forming the hole 6a, but it is difficult to position and attach the proximity switch with high precision (within the thickness of the strip 1), and it lacks practicality.

In addition, in order to solve the above-mentioned problems,
As described in Publication No. 56-47225, there is a means for measuring the laminated thickness dimension that activates a mark mechanism at an arbitrary point before the number of sheets to be laminated, and furthermore, a means for measuring the laminated thickness dimension that activates a mark mechanism at any time before the number of sheets to be laminated, and further adds and accumulates at each timing signal, and punches out when the target value is exceeded. A method for producing a laminated core with accurate lamination thickness has been disclosed, but this Japanese Patent Application Laid-Open No. 56-47225
What is disclosed in the publication is that when controlling the laminated thickness of the laminated iron core plate, a detection mark (mark hole or paint) is attached to the laminated iron core plate piece to detect the presence or absence of the laminated iron core plate piece. For this reason, the marked parts cannot be processed, which reduces the degree of freedom in processing the laminated core plate pieces (when forming mark holes), and the detection marks cannot be made with paint. When forming, there is a drawback that the number of work steps increases.

This invention was made in view of the above-mentioned circumstances, and as well as manufacturing a laminated iron core with accurate lamination thickness,
It is an object of the present invention to provide a laminated core mold device that improves the degree of freedom in processing laminated core plate pieces and reduces the number of work steps.

According to this invention, in the above mold device,
a numerical value setting means, and a position for detecting the piston rod position of the cylinder when the laminated thickness of the laminated core piece on the cylinder that generates receiving pressure becomes a laminated thickness slightly smaller than a predetermined times the desired laminated core thickness; a detecting means; and means for outputting a cut signal for forming a hole for non-coupling when the number of press strokes after detecting the piston rod position reaches a numerical value set by the numerical value setting means; The set numerical value is appropriately adjusted by the numerical value setting means to compensate for installation errors of the position detecting means, and thus a laminated iron core having a desired lamination thickness is manufactured.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 8 is a block diagram showing an embodiment of a lamination thickness control system of a mold device for a laminated iron core according to the present invention, and FIGS. 9a to 9g are timing charts of signals of each part in FIG. Moreover, FIGS. 10a to 10e are diagrams for explaining the operation of the cylinder according to the present invention.

In FIGS. 10a to 10e, a cylinder 20 is a cylinder that receives the laminated core piece drawn into the die 8 from below, generates a receiving pressure during caulking, and performs an upward and downward movement when taking out the product. The proximity switch 21 detects the upward force pushing up the cylinder 20, and outputs a high level signal in the states shown in FIG. 10b, c, and e.
Of course, the above-mentioned pushing up force is smaller than the frictional resistance force between the laminated core pieces and the inside of the die 8, but larger than the weight of one product.

The proximity switch 22 is arranged to output a high level signal when the piston rod position of the cylinder 20 is below the position shown in FIG. 10c. Here, the piston rod position shown in FIG. 10c is the position when the total stacking thickness x of the laminated core pieces stacked on the cylinder 20 is slightly smaller than twice the desired stacking thickness. do. Now, if the thickness of the strip 1 is 0.5 mm and a laminated core with a stack thickness of 50 mm is to be manufactured, the total stack thickness x is, for example, 97 mm.

The proximity switch 23 is arranged to output a high level signal when the piston rod position of the cylinder 20 reaches the position shown in FIG. 10d, that is, the product removal position. In addition, the proximity switch 22
As explained in the prior art, the accuracy of the mounting positions of 2 and 23 is not high, and there is an error of, for example, 1 to 2 mm (about 2 to 4 laminated core pieces).

When manufacturing the first product A (FIG. 10b), the stacking thickness is determined by controlling the number of products. In this case, the thickness of strip 1 is 0.5mm,
Since the desired stacking thickness is 50 mm, the above number is 100.

In FIG. 8, the setting switch 30 is set to
Set 100. The phase detection circuit 31 receives the press stroke signal (FIG. 9a) and outputs a clock signal to the counter 32 and the synchronization circuit 33, for example, every time the press reaches the top dead center. counter 3
2 is reset to 0 in the initial state, and thereafter counts the input clock signal and outputs a signal indicating the counted value to the changeover switch 34.

The changeover switch 34 is a latch circuit 37 which will be described later.
The movable contact piece 34a is connected to the contact point 34b by the output of
or 34c, and when manufacturing the first product A, the movable contact piece 34a
is connected to contact 34b. Therefore, a signal indicating the count value of the counter 32 is applied to the coincidence detection circuit 35 via the changeover switch 34.

A signal indicating a set value of 100 is applied from the aforementioned setting switch 30 to the other input of the coincidence detection circuit 35, and when the two input signals match, the coincidence detection circuit 35 outputs a coincidence signal to the output circuit 36 and the latch. Add to circuit 37.

The output circuit 36 receives the coincidence signal and outputs a cut signal for forming the non-coupling hole 6a in the laminated core piece 9. This cut signal energizes the solenoid 13 shown in FIG. 5 to change the amount of protrusion of the punch 10. Further, the latch circuit 37 latches the coincidence signal, and in response to the signal, the movable contact piece 34a of the changeover switch 34 is switched and connected to the contact point 34c.

When the first product A is manufactured in this manner, the laminated core pieces 9 are laminated within the die 8 in order to subsequently manufacture the second product B.

The laminated core piece 9 is punched out of the cylinder 20, and each time the cylinder 20 is pressurized by the punch 16, it gradually descends by an amount equivalent to the thickness of the laminated core piece 9 (see FIG. 9g). The proximity switch 22 outputs a high level signal when the piston rod position of the cylinder 20 is below the position shown in FIG. 10c (see FIG. 9c). Note that this signal sag is caused by the inertia of the piston rod due to press punching.

The output signal of the proximity switch 22 is sent to the synchronous circuit 33.
added to. The output signal of the proximity switch 21 (see FIG. 9b) and the signal from the phase detection circuit 31 are added to the other inputs of the synchronization circuit 33, and the synchronization circuit 33 calculates the output signal from the AND condition of these three input signals. A trigger pulse is output to the one shot circuit 38.

The one shot circuit 38 is of a retrigger type with a pulse width longer than one cycle of the press stroke.
The output signal (FIG. 9d) is output to the differentiating circuit 39. The differential circuit 39 takes the rising edge differential of the input one shot, and resets the count value of the counter 32 to 0 based on this differential signal.

The counter 32 continues to count the number of press strokes even after being reset, and sends a signal indicating the counted value to the coincidence detection circuit 4 via the changeover switch 34.
It is added to 0.

A signal indicating the setting value 4 is applied from the setting switch 41 to the other input of the coincidence detection circuit 40, and when the two input signals match, that is, after the counter 32 is reset,
When the counter 32 counts 4, it applies a match signal to the output circuit 36. The details of the numerical values set in the setting switch 41 will be described later.

The output circuit 36 receives the coincidence signal and outputs a cut signal for forming a non-coupling hole 6a in the laminated core piece 9 (see FIG. 9e).

Furthermore, when the count value of the counter 32 reaches 6, a cylinder start signal (9th
(see Figure f). Note that illustration of a coincidence detection circuit and a setting switch for outputting this cylinder start signal is omitted. Further, the set value 6 is determined by the stacking thickness of one product and the thickness of the die 8. In other words, if the product to be taken out is not lower than the die 8, it will not come down even if the cylinder 20 is started, and if it goes down too much, the product may crack due to insufficient side pressure, or the product to be taken out may break. Since the product above may also fall down, the set value for starting the cylinder 20 is determined so that these inconveniences do not occur.

When the cylinder start signal is output, the cylinder 20 rapidly descends (see Fig. 9g), and when the proximity switch 23 detects that the cylinder 20 has descended to the product removal position (see Fig. 10d), the cylinder 20 descends rapidly (see Fig. 9g). 19 (FIG. 1), product A is pushed out and taken out. After the product A is taken out, the cylinder 20 quickly rises again and comes into contact with the next product B (see FIG. 10e).

Thereafter, products are manufactured one after another in the same manner as above.

Now, product A whose stacking thickness is controlled by number of sheets.
If the stack thickness of product B is exactly 50 mm, the proximity switch 22 should detect the piston rod position when the stack thickness of product B reaches 47 mm. because,
This is because the positioning is such that the piston rod position is detected when the total thickness x on the cylinder 20 becomes 97 mm or more.

After the proximity switch 22 detects the piston rod position, it takes four press strokes until a cut signal is output, and this cut signal further stacks the laminated iron core pieces 9 in which the non-coupling hole 6a is formed. (The station for forming the hole 6a is the third station, and the station for punching and caulking the laminated core pieces 9 is the fifth station.)
Six laminated core pieces 9 are further laminated on the product B, and the laminated thickness of the product B is 47 mm + (4 + 2) x 0.5 mm = 50 mm.

However, as mentioned above, the proximity switch 2
Since the positioning accuracy of No. 2 is not high, it is conceivable that the piston rod position is actually detected only when the total volume thickness x becomes, for example, 98 mm or more. In this case, by changing the setting of the setting switch 41 from 4 to 2, the stacking thickness of the product can be set to 48 mm + (2 + 2) x 0.5 mm = 50 mm. The positioning error of the proximity switch 22 can be determined by measuring the stacking thickness of the product taken out and calculating backwards from the measured value, and the setting value of the setting switch 41 can be adjusted appropriately according to the positioning error. reset to the correct value.

On the other hand, even if the proximity switch 22 is positioned at the desired position, the thickness of the product A is controlled by the number of sheets, so the stacked thickness may be 51 mm, for example. In this case, product B has a stacking thickness of 49
mm, and henceforth products with stacked thicknesses of 49 mm and 51 mm will be manufactured alternately. In order to solve this problem, for example, during the manufacture of a product with a stack thickness of 49 mm, the output timing of the cut signal is delayed by two press strokes, that is, the setting value 4 of the setting switch 41 is temporarily set to 6, and then the cut signal is outputted again. You can set it back to 4.

Of course, even if the proximity switch 22 is not positioned at the desired position and the stacking thickness of the first product whose number has been managed is not the desired stacking thickness, the setting value of the setting switch 41 can be adjusted as appropriate. Products with desired stacking thickness can be manufactured. Further, once the setting value of the setting switch 41 has been adjusted, it is not necessary to change the setting value unless the thickness of the strip changes significantly and the stacking thickness error exceeds the thickness.

In this embodiment, the proximity switch 22 is installed at the piston rod position when the total stacking thickness x of the laminated core pieces stacked on the cylinder 20 is slightly smaller than twice the desired stacking thickness. However, the position may be used to detect the piston rod position when the stacking thickness is slightly smaller than the desired stacking thickness by one or three times or more. However, if the detection position is a stacking thickness that is slightly smaller than 1, the stacking thickness of one product is sufficiently large compared to the thickness of the die 8, and after taking out the product,
This can be applied when a new product has not been completed before the cylinder is raised again, and when the detection position is a stacking thickness that is slightly smaller than a multiple of 3 times or more, the stacking thickness of one product can be It is sufficiently small compared to the thickness of the die 8, and can be applied when only one product comes down when taking out the product.

As explained above, according to the present invention, the laminate thickness is directly detected until the laminate thickness is slightly smaller than the desired laminate thickness, and after that detection, the laminate thickness of the laminated iron core is controlled by number management until the desired laminate thickness is reached. Since the structure allows adjustment of the stack thickness, the stack thickness error can be reduced to 1 regardless of the positioning error of the mounting position of the means for directly detecting the stack thickness.
The thickness can be kept within the thickness of two laminated core pieces.

The present invention also includes a position detection means for detecting the piston rod position of the cylinder when the thickness of the laminated core pieces on the cylinder becomes slightly smaller than a predetermined times the desired thickness of the laminated core. Therefore, when controlling the laminated thickness of the laminated core plate, there is no need to attach detection marks (mark holes or paint) to the laminated core plate pieces to detect the presence or absence of the laminated core plate pieces. It is possible to improve the degree of freedom in processing the iron core plate pieces or shorten the working process.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing an example of a mold used in carrying out the present invention, Fig. 2 is a plan view of a strip, and Fig.
Figure a is an enlarged plan view showing the cut and raised protrusion portion, Figure 3 b is a sectional view taken along line A-A in Figure 3 a, Figure 4 a is an enlarged plan view showing the hole for non-bonding, Figure 4 b is a sectional view taken along the line B-B in FIG. Fig. 7 is an enlarged vertical cross-sectional view of a hole forming state for non-bonding, Fig. 8 is a block diagram showing an embodiment of the lamination thickness control system of the mold device for a laminated core according to the present invention, and Figs. 9 a to g. 8 is a timing chart showing the signals of each part and the control mode of the cylinder, and FIGS. 10 a to 10 e are diagrams used to explain the operation of the cylinder according to the present invention. DESCRIPTION OF SYMBOLS 1... Strip, 6, 6a... Hole, 7... Cut-and-raised projection, 8... Die, 9... Laminated core piece, 10, 16... Punch, 12... Cam part, 13... Solenoid, 14...
Cam, 18, 19, 20...Cylinder, 21, 2
2, 23... Proximity switch, 30, 41... Setting switch, 31... Phase detection circuit, 32... Counter, 3
3... Synchronous circuit, 34... Selector switch, 35, 40
...Coincidence detection circuit, 36...Output circuit, 37...Latch circuit, 38...One shot circuit, 39...Differential circuit.

Claims (1)

[Scope of Claims] 1. A station that forms caulking protrusions on the strip with a protrusion amount not exceeding the plate thickness of the strip with each press stroke, and punches out the portion where the caulking protrusions are to be formed using a cut signal; The laminated core piece is pulled out from the strip into the die by the punch that is pressed down with each press stroke, and the caulking protrusion is applied by the pressurizing force of the punch and the cylinder that receives the laminated core piece pulled into the die from below. In a laminated core molding device having a station for caulking, the laminated core pieces have a numerical value setting means and a laminated core piece on the cylinder has a laminated thickness slightly smaller than a predetermined times the desired laminated core thickness. position detecting means for detecting the piston rod position of the cylinder at the time of the press stroke, and means for outputting the cut signal when the number of press strokes after detecting the piston rod position reaches a numerical value set by the numerical value setting means. . A laminated iron core mold apparatus for manufacturing a laminated iron core with a desired lamination thickness by adjusting a set numerical value by the numerical value setting means and changing the output timing of the cut signal. 2. The means for outputting the cut signal includes a counter that counts the number of press strokes and is reset by a detection output from the position detecting means, and a count value of the counter is set by the numerical value setting means. The laminated iron core mold apparatus according to claim 1, further comprising a coincidence detection circuit that outputs the cut signal when the numerical values match.