JPH0257689B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a strip cutting control device for a wound core for a transformer.

[Conventional technology]

BACKGROUND ART Wound cores, which are formed by winding a strip material with excellent magnetic properties into a ring shape, are widely used as transformer cores. For example, as shown in FIGS. 6 and 7, the wound core 1 is obtained by winding a strip material whose width direction has been cut out in advance into a predetermined shape, and whose cross section is square or square. In addition to the rectangular shape, the core has a stepped core (Fig. 8) or a circular shape (Fig. 9). A cylindrical coil bobbin 2, which has been divided into two in advance, comes into pressure contact with the winding core 1 at the pressure contact surface 3, and by rotating the coil bobbin 2 with respect to the winding core 1, the coil bobbin 2 is wound (Fig. (not shown).
There is also a cut core type in which the iron core is cut and separated at the coil insertion legs and inserted into a pre-prepared coil for assembly. The band material for the wound core shown in FIG. 9 has the shapes shown in FIGS. 10A and 10B.

[Problem that the invention seeks to solve]

When manufacturing the above-mentioned wound core, first, a continuous slitting device cuts out the material into a plurality of continuous strips of a predetermined shape and temporarily winds them on a winding frame, and then a winding device cuts each strip into strips. Wind it onto the winding jig. In this case, the winding thickness must be a predetermined thickness. In other words, if the winding thickness is too small, the air gap between the coil bobbin and the winding core will increase and the effective cross-sectional area will decrease, resulting in insufficient magnetic flux, and conversely, the winding thickness will be too large. If this happens, the rotation of the coil bobbin 2 may become jammed, or the coil bobbin 2 may become impossible to mount. For this reason, conventionally, when cutting out a strip of a predetermined shape using a slitting machine, the thickness of the strip was first measured, the total length was calculated based on that, the slitting machine was operated, and the thickness of the strip was cut out. The strip material is wound on a winding jig of a winding machine, a formed iron core is obtained, the cross-sectional shape is judged for the first time, and the overall length is adjusted.
This process was repeated over and over again, but it was time-consuming and the cutting width was not automatically controlled depending on the thickness of the strip, so even if it was wound onto a winding jig, it would not be possible to obtain a predetermined cross-sectional shape, such as a circular cross-sectional shape. As a result, the effective cross-sectional area of the wound core could not be obtained sufficiently, and therefore the amount of magnetic flux was insufficient, leading to a decrease in core performance.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a strip cutting control device for a wound iron core that allows a predetermined cross-sectional shape to be accurately obtained when the strip is wound around a winding jig.

[Means for solving problems]

A means for solving the above-mentioned problems is shown in FIG. That is, in a strip material cutting control device for a winding core in which a material is cut into a plurality of continuous strips having a predetermined shape by a continuous slitting device and the cut-out strips are wound onto a temporary winding frame, the thickness measuring means is used to The thickness t _i of the strip material wound around the take-up frame is measured, and the running length measuring means measures the running length L of the strip material. Then, the thickness cumulative calculation means cumulatively calculates the thickness of the strip material every predetermined length L _p of the measured running length. As a result, the cutting width control means controls the cumulatively calculated thickness Σt _i
The cutting width of the continuous slitter device is controlled accordingly. Furthermore, the comparison means is the cumulatively calculated thickness Σt _i
is compared with a predetermined thickness _tR , and as a result, when the cumulatively calculated thickness Σt _i reaches a predetermined length _tR , the period repeating means repeats the operation cycle of the cutting width control means.

[Effect]

According to the above-mentioned means, the cutout width of the strip material is controlled depending on the thickness of the strip material.

〔Example〕

FIG. 2 is a schematic diagram showing an embodiment of a band cutting control device for a wound core according to the present invention. In FIG. 2, the raw material 12 from the raw material coil 11 is cut into a strip material 12' by a continuous slitter device 14 having one or two pairs of slitter blades via a tension adjustment mechanism 13, and then cut into a strip material 12' by a temporary winding device. 15. Reference numeral 16 is a thickness gauge for measuring the thickness of the material 12 (strip material 12'), and is, for example, a differential transformer type thickness gauge, a capacitance type thickness gauge, or the like. The output of the thickness gauge is supplied to an A/D converter 191 of the control device 19. Reference numeral 17 is a running length meter of the material 12 (strip material 12'), which generates pulses in accordance with the rotation of the slitter blade of the continuous slitter device 14, for example. Further, 14a is a drive motor for driving the slitter blade of the continuous slitter device 14 in the width direction to control the cutting width, and 15a is a drive motor for the temporary take-up frame 15, which are input to the control device 19. It is connected to the output interface 195. moreover,
8 is a start switch for the drive motor 16, which is also connected to the input/output interface 195 of the control device 19.

The control device 19 is composed of, for example, a microcomputer, and includes, in addition to an A/D converter 191 and an input/output interface 195, a CPU 192, a ROM 193 for storing programs, etc., a RAM 194 for storing temporary data, etc.

The operation of the control device 19 in FIG. 2 is shown in FIGS. 3 and 4.
This will be explained with reference to the flowcharts shown in FIGS.

The routine shown in FIG. 3 is an interrupt routine that starts when the start switch 18 is turned on. In step 301, the traveling length counter L of the material 12 (strip material 12') is cleared, in step 302 the cumulative thickness T is cleared, in step 303 the driving motor 15a is turned on, and in step 304 this is The routine ends. In this way, the temporary take-up frame 15 rotates as shown by the arrow, and the material 1
2 cutting and winding of the strip 12' begin.

Cuttings of material 12 and strip material 1 as described above
When the winding operation 2' is started, an interrupt routine shown in FIG. 4 is executed every time a pulse is generated by the running length meter 17. At step 401 in FIG. 4, the travel length counter L is counted up by +1 and the RAM
194, and the routine ends at step 402.

FIG. 5 shows a thickness measurement routine, which is executed at predetermined time intervals. In step 501, the value of the traveling length counter L is read from the RAM 194, and it is determined whether or not it has reached a predetermined value _Lp , that is, whether the material 12 (strip material 12') has traveled a predetermined length.
Only when running for a predetermined length (L>L _p ), step 5
Proceed to 02-507, otherwise go to step 5
Proceed directly to 08.

In step 502, the running length counter L is cleared. Next, in step 503, the thickness gauge 1
6 is A/D converted and taken in, step 50
In step 4, the cumulative thickness T is set as T←T+t _i . Next, in step 505, the cumulative thickness T
It is determined whether or not has reached a predetermined value _tR . As a result, when the cumulative thickness T reaches the predetermined value t _R (T>t _R ), the process proceeds to step 506, where the cumulative thickness T is cleared.

In step 507, the ROM is determined by the cumulative thickness T.
The position of the slitter blade of the continuous slitter device 14 is determined by interpolating a predetermined cutting curve (primary map) stored in advance in the slitter 193 to calculate the cutting width, and controlling the drive motor 14a according to this cutting width. change.

The routine then ends at step 508.

In this way, the thickness t _i of the material 12 (strip material 12') is taken for each predetermined length, and the cutting width of the strip material 12' is controlled based on the cumulative thickness T (=Σt _i ). This cutting width control is then repeated for each cumulative thickness _tR . Therefore, a band material for a wound core with a predetermined cross-sectional shape, for example, a stepped wound core shown in FIG. 8 and a band material for a wound core with a circular cross-sectional shape shown in FIG. When the strip material is wound around a winding jig, the desired cross-sectional shape can be obtained accurately.

〔Effect of the invention〕

As explained above, according to the present invention, in the continuous slitting device, the cutting width of the strip material is controlled by its thickness, so the shape of the strip material is accurate, and as a result, the strip material can be processed in the subsequent process. When wound around a winding jig, the cross-sectional shape takes on a predetermined shape, for example, a nearly perfect circular cross-sectional shape, which is useful for improving the effective cross-sectional area of the wound core and increasing the magnetic flux.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of the present invention.
FIG. 2 is a schematic diagram showing an embodiment of a belt material cutting control device for a wound core according to the present invention; FIGS. 3, 4, and 5; FIG.
The figure is a flowchart showing the operation of the control device in Fig. 2, Figs. 6 and 7 are external views showing examples of general wound cores, and Figs. 8 and 9 are examples of general wound iron cores. FIG. 10 is a plan view showing an example of the strip material shown in FIG. 9. 1... Winding core, 2... Coil bobbin, 11...
Material coil, 12...Material, 12'...Strip material, 1
3...Tension adjustment mechanism, 14...Continuous slitting device, 15...Temporary winding frame, 16...Thickness gauge, 17
...Traveling length meter, 18...Start switch, 1
9...Control device.

Claims (1)

[Scope of Claims] 1. A strip material cutting control device for a wound core in which a material is cut into a plurality of continuous strips having a predetermined shape using a continuous slitting device, and the cut out strips are temporarily wound onto a winding frame, comprising: a thickness measuring means for measuring the thickness of the strip wound on the temporary winding frame; a running length measuring means for measuring the running length of the strip; and every predetermined length of the measured running length. a thickness accumulation calculation means for cumulatively calculating the thickness of the strip material measured in the above; a cutting width control means for controlling the cutting width of the continuous slitter device according to the cumulatively calculated thickness; and the cumulative calculation. a thickness comparing means for comparing the calculated thickness with a predetermined thickness; and a period repeating means for repeating the operating cycle of the cutting width control means when the cumulatively calculated thickness reaches the predetermined thickness. A belt material cutting control device for a wound iron core.