JPH0236331B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a laminated iron core manufacturing apparatus that manufactures a laminated iron core by laminating iron core pieces while caulking each other.

(Prior Art) In this type of conventional device, the laminated thickness of a product is managed by counting the number of laminated iron core pieces. That is, the target number of laminated pieces is calculated by dividing the required laminated thickness by the thickness of the strip material (steel plate) for manufacturing the iron core that was measured in advance, and the counted value of the number of laminated pieces of the iron core pieces reaches the target number of laminated pieces. Sometimes it is determined that a single product has been formed.

(Problem to be Solved by the Invention) The conventional device that manages the lamination thickness by counting the number of laminated iron core pieces as described above has an error in the lamination thickness of the product when the thickness of the strip material changes. It had the disadvantage of causing That is, if the target number of laminated products is 200, for example, if the thickness of the strip material changes by 0.005 mm, there is a problem that the laminated thickness of the product becomes 1 mm thicker than the required laminated thickness.

In short, conventional devices cannot accommodate changes in the thickness of the strip material.

(Means for Solving the Problems) The present invention includes means for measuring the position of a piston rod that receives an iron core piece, a counter for counting the number of press strokes, and a counter for counting the number of press strokes when the count value of the counter reaches a preset value A. At the same time, the stroke length ΔP of the piston rod during the time when K timing signals are generated is detected based on the output of the rod position measuring means, and the average plate thickness of the iron core piece t=Δl/ means for calculating K, and calculating a target number N of laminated sheets based on the required laminated thickness H and the average plate thickness t, and resetting the counter when the counted value of the counter reaches the target number N of laminated sheets. It consists of

(Function) According to the present invention, the target number of laminated iron core pieces is updated to an appropriate value according to the change in the thickness of the iron core pieces.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 illustrates a progressive die mechanism in a laminated iron core manufacturing apparatus according to the present invention.

This mold mechanism section has a first station to a fifth station, and the first station has a strip material (steel plate) 1 as shown in FIG.
A skew escape round hole 2 and a pilot hole 3 are drilled in the second station, and a shaft hole 4 and a lotus slot 5 are drilled in the second station.

At the third station, there is a round hole for skewing.
Cut-and-raised protrusion extraction hole 6 and cut-and-raised protrusion 7 leading to
(See Fig. 3 a, b) is formed, and as shown in Fig. 4 a, b, by actuation of the solenoid based on the cut signal described later, the cut-and-raised protrusion 7 is removed. A hole 6a is formed.
That is, the punch 10 in the third station has a lower cutting edge 10a having a shape necessary for forming the protrusion 7, as schematically shown in FIG. A taper cam 12 facing into the punch holder 11 is formed at the upper end, which is the base. This cam 12 is always in contact with a cam 14 that is driven forward and backward by a solenoid 13 attached to the punch holder 11.

Fig. 6 shows the position of the cutting edge of the punch 10 when the punch holder 11 is lowered to the lowest end with the solenoid 13 not activated, and Fig. 7 shows the position of the cutting edge when the solenoid is activated. . Therefore, at this third station,
The cut and raised projection 7 is formed when the solenoid 13 is not activated, and the hole 6a is formed when the solenoid 13 is activated.

The stripper 15 shown in the figures has the function of pressing the strip material 1 from the upper surface side during the press stroke.

The fourth station is an idle station for maintaining the strength of the mold, and no processing is performed here. At the fifth station, the punch 16 and the rotary die 8 punch out the outer shape of the iron core piece 9 and caulk it. The cut and raised protrusions 7 of the subsequent iron core constituent pieces are caulked and fitted into the cut and raised protrusion holes 6 of the iron core piece 9, and are integrally coupled.

Incidentally, since the portion in which the hole 6a shown in FIG. 4b is formed does not have a cut-and-raised protrusion, it is not caulked during the above-mentioned outline cutting. The cut-out portion becomes a separation core for separating the products.

A cylinder 18 is provided below the die 8 . This cylinder 18 receives the iron core piece 9 drawn into the die 8 by a holder 20 attached to the tip of the piston rod 19, and generates a receiving pressure when punching and caulking with the punch 16. Each time the iron core piece 9 is pulled out, it is lowered by an amount corresponding to the thickness of the iron core piece 9.

The pedestal 20 is levitated by a predetermined length from the tip of the rod 19 by a spring (not shown), and when the upper surface of the pedestal 20 is pressed by the iron core piece 9 and the floating distance disappears, the pedestal 20 is provided below. protrusion 20
a presses the switch 21 to actuate it.

Cylinder 22 arranged on the side of cylinder 18
is activated when a product is taken out, which will be described later.

The inner diameter of the die 8 is set so that an appropriate amount of frictional force is applied to the outer periphery of the iron core piece 9.
This frictional force provides a pressing force between the iron core pieces 9.

FIG. 9 shows a control unit 30 that manages the lamination thickness of the product.
This control unit includes a keyboard 31 for inputting setting values and the like to be described later, a timing signal generator 32 for generating a timing signal every time the punch holder 11 shown in FIG. 1 makes a press stroke, and the piston rod. A pulse encoder 33 that outputs a number of pulse signals corresponding to the stroke amount of the piston rod 19, an up-down counter 34 that counts the output of the pulse encoder 33 and detects the position of the piston rod 19, an output of the switch 21, and a timing signal generator. 32 and counter 34
A central processing unit (hereinafter referred to as CPU) 35 executes the procedure described below based on the output of
It consists of a memory 36 connected to a CPU 35.

The CPU 35 is programmed with a first counter that counts the timing signal and a second counter that counts the timing signal after the switch 21 is activated, and executes the processing procedure shown in FIG.

The operation of this embodiment will be explained below with reference to the same figure.

As shown in FIG. 10, when manufacturing a laminated iron core product using the apparatus according to this embodiment, the following value setting operation is first performed by operating the keyboard 31 (step 100).

N ₀ : is the initial target number of laminated sheets per manufactured product, and in this example, N ₀ is set to 100.

Nc: A criterion value for the count value n of the first counter, which is set to Nc=2 in this example. α, K: A criterion value for the count value m of the second counter. Yes, in this example α=7,
K=86 is set.

H: Required lamination thickness of product These values are stored in the memory 36.
The value N ₀ can be obtained by measuring the thickness of the strip material 1 shown in FIGS. 1 and 2 and dividing the required lamination thickness by the measured value.

After the above setting operation, the values m and n of the second and first counters are reset (step 101,
102). Then, when the die holder 11 makes a press stroke (step 103), the count value n of the first counter is incremented by one (step 104), and it is then determined whether the count value n has reached 2 (step 103).
105). Incidentally, as the die holder 11 strokes, the timing signal generator 32 outputs the timing signal shown in FIG. 11a.

When the first press stroke is performed in step 103, processing is performed at the first station shown in FIG. The processing part will be located at the second station.

When the first press stroke is executed, the value n of the counter shown in step 104 is 1;
Therefore, the determination result at step 105 is NO.
Then, the program jumps to step 107, and it is determined whether or not the switch 21 shown in FIG. 1 has been actuated. Since it is below 8, the result of this judgment is also NO.

Next, it is determined whether the count value n of the counter has reached N ₀ = 100 (step 108), but since the result of this determination is of course NO, the steps in step 103 and
104 processes are executed. As a result, the value n of the counter becomes Nc=2, and the judgment result of step 105 is
Since the answer is YES, the cut signal shown in FIG. 11b is output at the end of this second press stroke (step 106).

This cut signal energizes a solenoid 13 shown in FIG. 5 provided at the third station, whereby the tip 10a of the punch 10 is lowered by a predetermined distance than usual.

At this point, the judgment results in steps 107 and 108 are both NO, so in step 103 the third
When the second press stroke is executed, the punch tip 10a penetrates the strip material 1 shown in FIG. 7, thereby forming the hole 6a shown in FIG. 4.

The cut signal disappears after the third press stroke, and from then on until the judgment result in step 108 becomes YES, that is, the count value n of the first counter reaches 100.
Steps 103 to 105 and step 107 until
The procedure shown in 108 is executed. As a result, the fifth
At the station, the iron core pieces 9 for product A are sequentially drawn into the die 8 as shown in FIG.

Note that since the hole 6a shown in FIG. 4 is formed at the third station during the third press stroke, the protrusion 7 is not present in the iron core piece that is first drawn into the die. The iron core piece 9a having no protrusion functions as a core for separating the products, and is hereinafter referred to as a separating core. In FIG. 12a, only this separation core 9a is hatched.

When the count value of the first counter reaches 100 and the judgment result in step 108 becomes YES, step
At 102, this first counter is reset.
After resetting the counter, the same procedure as above is carried out, thereby stacking the iron core pieces 9 for product B in the die 8 as shown in FIG. 12b. Note that a separating core 9a is interposed between the iron core piece for product A and that for product B.

In Figure b, the separation core 9a of product A is placed on the cradle 2.
0 and the switch 21 is activated. When switch 21 is activated,
Since the judgment result in step 107 is YES, the count value of the second counter is incremented by one (step 107).
109), the current count is 1. Then, a judgment is made as to whether or not the value of the count value m is α=7 (step 110), and since the result of this judgment is NO, the process jumps to step 111.
Here, it is determined whether the count value n has reached 100 (step 112).

Now, as shown in FIG. 11c, if the switch 21 is actuated when the count value n of the first counter is 51, the judgment result at step 112 is NO.
Thereafter, the contents shown in steps 103 to 105 and steps 107, 108, 109, 110, and 112 are repeatedly executed until m=7, that is, until the determination result in step 110 becomes YES.

Incidentally, as the piston rod 19 moves downward, the pulse encoder 33 outputs a pulse signal corresponding to the amount of downward movement, and this signal is counted by the up-down counter 34.
The output of the counter 34 therefore indicates the position of movement of the piston rod 19.

When the count value m of the second counter reaches 7 and the judgment result in step 110 becomes YES, that is, the first
When the count value n of the first counter reaches 57 as shown in Figure 1a, the piston rod 19 is moved as shown in Figure 1d.
The reading of position _P1 is executed (step 111).
When the stacking of the iron core pieces 9 further progresses and the count value n of the first counter reaches 100, the determination result in step 112 becomes YES and the counter is reset (step 113). In this embodiment, as described above, the position P ₁ is read when the count value m of the second counter reaches 7, but this is done immediately after the iron core piece reaches the cradle 20. This is because the operation of the cylinder 18 is not stable.

From then on, steps 103, 104, 105, 106 and 107
The procedure is similar to that of steps 114, 115, 116,
Runs on 117 and 118. Since the switch 21 maintains its operating state from the moment when the judgment result in step 107 becomes YES until the present time, the judgment result in step 118 is YES. Therefore, steps similar to those shown in steps 109 and 110 are sequentially executed in steps 119 and 120, but as is clear from FIG. 11, the determination result in step 120 is NO.
Therefore, the program jumps to step 122 and determines whether the count value m is K(86)+α(7).

Since the current count value n of the second counter is 1, the judgment result at step 122 is NO.
Therefore, steps 114 and 115 are executed again. As a result, the value n of the first counter becomes 2.
Therefore, the judgment result in step 116 is YES.
becomes. As a result, after the prestroke for the value n=2 is completed, the third cut signal is output, and thereafter steps 118 to 120, steps 122, and steps 114 to 116 are performed until the judgment result in step 122 becomes YES. The contents shown are executed repeatedly.

Note that if the reference for the moving position of the piston rod 19 is the upper surface of the pedestal 20, the position _P1 is the first position.
It is shown as in Figure 2c. In addition, the stacking state of the iron core pieces at the time when the third cut signal is outputted and the stacking state at the time when product B is formed and the separation core is placed on the top surface are shown in Fig. d. , e.

If the determination result in step 122 is YES, the position _P2 of the piston rod 19 is read based on the output of the counter 34 (step 123), and then the position
An operation is performed to obtain the average plate thickness t=ΔP/K by dividing the difference ΔP=P ₂ −P ₁ between P ₂ and P ₁ by the value K (86) (step 124). Then, calculation is performed to obtain a new target number of laminated sheets N by dividing the required laminated thickness H by the average sheet thickness t determined in step 124 (step 125).
This stacked number N is stored in the memory 36 as the target stacked number for product C. In other words, the above-mentioned initial target number of laminated sheets N ₀ is updated to the value N.

By the way, when the position of the piston rod 19 is located below the bottom surface of the die 8 shown in FIG. 1 by the laminated thickness of the product + 2 mm, that is, in this example, as shown in FIG.
When the position reaches _P2 , the lowering of the rod 19 is started (see Fig. 11e). In addition, product A
If the product A is taken out too early, it will be difficult to take it out because the side pressure from the die 8 is acting on the product A. If the unloading time is too late, no lateral pressure will be applied to a part of the product B, causing problems such as the product B falling or part of it separating due to the impact of the press. When the rod 19 descends, the product A is separated by the separating core 9a and placed on the pedestal 20, as shown in FIG. 13g.
In addition, since the pressure applied to the upper surface of the pedestal 20 is reduced, the switch 21 is opened.

On the other hand, after the above-mentioned new target number of laminated sheets N is set, it is determined in step 126 whether or not the count value n has reached N, and the result of this determination is NO since the count value n at the present time is 43. . Therefore,
The contents of steps 114, 115, 116 and 118 are executed again, but as mentioned above, the switch 21 was opened after the previous press stroke (n=43), so the decision result of step 118 is NO.
becomes. As a result, the count value m of the second counter
is reset (step 127), and the process returns to step 114.

13h and 13i show the lowered positions of the piston rod 19 when the count value n is 45 and 46, respectively. The rod is stopped when it is lowered to the P ₃ position,
Then, as shown in FIG. 11f, the CPU 34 outputs a signal to extend the rod 22a of the cylinder 22. As a result, the product A is taken out from above the pedestal 20 by the piston rod 22a of the cylinder 22, as shown in FIG.
A is immediately retracted as shown in FIG. 14k.

When the removal of the product is completed, the piston rod 19 is raised as shown in FIG. contact and the switch 21 is reactivated.

When the switch 21 is actuated, counting of m is started in step 119, and the press stroke is repeated thereafter. When the value of m becomes K+α, the calculation processing shown in steps 123 to 125 is executed again, and the target number N of laminated sheets for the next product D (not shown) is set.

As is clear from the above explanation, according to this example, for the first and second products A and B,
Initially, the target number of sheets N ₀ is applied, but for products after product C, an appropriate target number N of laminated sheets according to changes in the thickness of the strip material 1 is sequentially updated and set.

Incidentally, the change in the thickness of the strip material 1 is gradual, and therefore the laminated thickness of the first and second products is not affected by the change in the thickness.

In the above embodiment, since the hole 6 is formed at the third station, the cut signal is generated immediately after the count value n of the counter reaches 2, but this cut signal is generated when n=4, for example. may be generated. However, in this case, two unnecessary iron core pieces 9 will be formed before the first separation core 9a is formed.

In short, the count value n=Nc of the first counter when generating the cut signal can be set arbitrarily, but in the above example, it is desirable to set Nc=2.

Note that the process of updating the target number of laminated sheets ends up adjusting the generation interval of the cut signal.

In the above embodiment, the pedestal 20 is lowered when the value of K shown in FIG. 11 reaches 86, but it is also possible to set the timing at which the cradle 20 starts descending as follows. .

In other words, the number of stacked products from when the first counter is reset until the lower end of the product B protrudes by 2 mm from the lower surface 8a of the die 8 shown in FIG. 13f is known in advance from the thickness of the die 8, etc. This number may be preset in the memory 36, and the pedestal 20 may be lowered when the number of press strokes reaches this preset value.

In this case, it is of course possible to update the preset value based on the average plate thickness t obtained in step 124 shown in FIG.

(Effects of the Invention) According to the present invention, the stroke amount of the iron core piece receiving cylinder is detected while a predetermined number of iron core pieces are being laminated, and a new I try to set a target number of laminated sheets. Therefore, the laminated thickness of the product can always be kept constant regardless of changes in the thickness of the strip material, and its practicality is extremely high.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of the structure of a mold mechanism part in a laminated iron core manufacturing apparatus according to the present invention, and FIG.
The figure shows the processing mode of each station in the mold mechanism section, Figure 3a is an enlarged plan view showing the cut and raised protrusion part, Figure 3b is a sectional view taken along line A-A in Figure 3a, Figure 4a is an enlarged plan view showing the state in which the protrusion shown in Figure 3 has been removed, and Figure 4b is the line B-B in Figure 4b.
5 is a cross-sectional view conceptually showing the configuration of a punch mechanism for forming a cut-and-raised protrusion and cutting the protrusion, and FIGS. 6 and 7 are respectively
A conceptual diagram showing the position of the punch tip when the solenoid shown in the figure is not activated and activated, FIG. 8 is a conceptual diagram showing how the iron core pieces are laminated while being caulked, and FIG. A block diagram illustrating the configuration of the control section of the device; FIG. 10 is a flowchart illustrating the processing procedure of the CPU shown in FIG. 9;
FIG. 11 is a timing chart showing the operation of the device according to the present invention, FIGS. 12, 13, and 1.
FIG. 4 is a state diagram showing the lamination mode of the iron core pieces and the position change of the piston rod. 1... Strip material, 6, 6a... Hole, 7...
Cut and raised projection, 8...Die, 9...Iron core piece, 10,
16... Punch, 12, 14... Taper cam, 1
3... Solenoid, 18, 22... Cylinder, 1
9... Piston rod, 20... cradle, 21...
...Switch, 30...Control unit, 31...Keyboard, 32...Timing signal generator, 33...Pulse encoder, 34...Up-down counter, 35...CPU, 36...Memory.

Claims (1)

[Scope of Claims] 1. A station provided with a means for forming caulking protrusions on a strip material for each press stroke and punching out a portion where the caulking protrusions are to be formed based on a cut signal; and a station equipped with a means for pulling out the iron core piece from the strip material into the die, and a station equipped with a piston rod for receiving the iron core piece pulled out into the die; In a laminated iron core manufacturing apparatus in which the iron core pieces are caulked together using the caulking protrusions, there is provided a means for generating a timing signal for each press stroke, and a rod position measuring means for measuring the position of the piston rod. means for counting the timing signal and outputting the cut signal when the counted value reaches a preset value Nc; average plate thickness calculating means for calculating the average plate thickness t=ΔP/K of the iron core piece by determining the stroke length ΔP of the piston rod during the occurrence of the piston rod; A laminated iron comprising a laminated sheet number calculating means for calculating a target laminated sheet number N, and a means for resetting the count value of the cut signal generating means when the count value reaches the target laminated sheet number N (>Nc). Core manufacturing equipment.