JPS63178514A - Iron core steel strip cutting equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] This invention relates to an iron core steel in which a plurality of amorphous magnetic ribbons are laminated and bonded to be used as a core material for laminated iron cores used in stationary electrical equipment such as transformers and reactors. The present invention relates to a cutting device suitable for cutting bands.

[Subject skill]

In recent years, an amorphous magnetic ribbon has been developed as a magnetic material to replace the conventional silicon steel strip, and various iron cores for stationary electrical equipment using this amorphous magnetic ribbon have been proposed. The core loss of this amorphous magnetic ribbon is 172 ~
Since it has a low iron loss of 1/3, it is expected to have an excellent energy saving effect when used in the iron core of a power transformer. It is thin and has low rigidity, and is also hard and brittle. Therefore, when manufacturing a laminated core using the amorphous magnetic ribbon, cutting the amorphous magnetic ribbon one by one is very inefficient and difficult, and the rigidity is very low. Therefore, there was a problem with the self-reliance, and the work of laying the iron core was difficult. Therefore, research and development is currently underway to find the use of amorphous magnetic ribbons as iron core materials, with the aim of adopting most of them as wound iron cores for small power distribution transformers.

However, recently, iron core materials made by laminating a large number of amorphous magnetic ribbons and heat-bonding them (for example, Metglass 26053-2, a trade name sold by Allied Corporation in the United States), have been laminated to increase the thickness. (hereinafter simply referred to as iron core steel strip) is commercially available as a copper strip for laminated cores.

This core steel strip is annealed in a magnetic field at the same time as the amorphous magnetic ribbon is laminated by the manufacturer.
There is an advantage that no heat treatment is required on the user side. Furthermore, since the required number of extremely thin amorphous magnetic ribbons are laminated, the rigidity is also increased. However, since the core steel strip has already been heat-treated, the embrittlement, which is a drawback of amorphous magnetic ribbon, has progressed further, and when it is cut, cracks, chips, etc. may occur at the same time as cutting. It has become difficult to use it as a core material for laminated cores, and there have been problems with the method of cutting the core steel strip into strips or the like.

That is, since the core steel strip is hard and extremely brittle as described above, when it is cut by ordinary cutting means, such as fusing with laser plasma or cutting with a grindstone, the cut portion may melt or undergo thermal strain deformation. .

Furthermore, when cutting with a press or shear (at room temperature), cracks, cracks, cracks, or layer peeling occur in the cut portion, making it difficult to use it as an iron core material.

For this reason, when cutting the core steel strip, the steel strip can be cut well to some extent by heating the cut portion of the steel strip and cutting with a cutting machine. This is considered to be because the hardness of the steel strip itself is softened to some extent by heating the core steel strip.

However, the thickness of core steel strips made of laminated amorphous magnetic ribbons varies widely in the width direction, making it extremely difficult to heat the cut points at a uniform temperature, resulting in differences in heating temperature. If you cut under this condition, parts that are heated to a certain temperature can be cut well, but parts that are heated to a certain temperature will crack, chip, or chip as before, and the cut part will have a saw-blade-like cut in some parts. There are cases where it cannot be used as a core material for laminated cores, and it cannot be said to be optimal as a means for cutting heat-treated core steel strips.

[Purpose of the invention]

This invention eliminates the above-mentioned drawbacks, and produces core material for laminated cores by smoothly and efficiently cutting heat-treated core steel strips produced by laminating and heat-bonding a plurality of amorphous magnetic ribbons. An object of the present invention is to provide a cutting device suitable for improving performance.

[Summary of the Invention] When cutting the steel core strip, the present invention arranges a plurality of electrodes in a line horizontally on both sides of the cut point of the steel core strip, and then cuts the steel core strip through each of these electrodes. Electric current is applied to heat the core steel strip, and when the temperature at the cutting point reaches a predetermined temperature, the cutting device is activated to cut the core steel strip. Even if a deviation occurs, each of the plurality of electrodes contacts the core steel strip individually according to the thickness deviation, and the temperature distribution at the cutting location is made almost uniform regardless of the thickness deviation, and the core steel strip is The present invention is characterized in that cutting is performed smoothly and reliably to improve productivity of laminated iron cores.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 14.

In FIG. 1, reference numeral 1 denotes an iron core steel strip formed by laminating and bonding a plurality of amorphous magnetic ribbons in the manufacturing process and then subjecting them to heat treatment (annealing), which is wound around a drum 2. 3 is a rotary encoder that detects the feed amount of the iron core steel strip 1;
is a feed roller for the steel strip 1, which is driven by an electric motor 5.

Reference numeral 6 denotes a cutting device of the present invention, and its structure is as shown in FIGS. The movable plate 1o is fitted so as to be vertically movable. Reference numeral 11 denotes an upper cutter attached to the center of the movable plate 10 parallel to the width direction of the core steel strip with the blade facing downward; The cutter 12 is upright. 1
Reference numeral 3 denotes support shafts which are suspended from the movable plate 10 by having their heads vertically movably latched onto the movable plate 1o on both sides of the upper cutter 11, with the upper cutter 11 in the middle. In the upper part of the iron core steel strip 1 that is quantitatively fed into the device 6,
As shown in FIG. 1, pressurizing bodies 14a and 14b having a U-shaped longitudinal section are fixed perpendicularly to the feeding direction of the core steel strip 1, and the pressurizing bodies 14a and 14b have inner surfaces thereof. As shown in FIGS. 6 and 10, a plurality of cushioning materials 15 having excellent heat resistance and insulation properties such as silicone rubber are pasted along the width direction of the core steel strip 1 at small intervals, Further, a plurality of electrodes 16 made of a copper-ringed and highly conductive material are arranged under each of these cushioning materials 15 in a state of protruding below the pressurizing bodies 14a, 14b. A pressure spring 17 is inserted through the support shaft 13 and inserted between the movable plate 10 and the pressurizing bodies 14a and 14b, and 18 is attached above the movable plate 10 to move the movable plate 10 along the column 9. It is an elevating cylinder that raises and lowers a certain distance by a cylinder, and is driven and controlled by valves V, , V shown in FIG. 19a and 19b are pressurizing bodies 1
4a, 14b, the movable pedestal is placed on the fixed pedestal 8 via the support shaft 20, and this movable pedestal 19a, 1
9b is a pedestal 8 for fixing the head, as shown in FIGS. 1 and 6.
The core steel strip 1 is supported on the upper end of the support shaft 20 which is vertically movably hooked to the support shaft 20, and is provided so that the iron core steel strip 1 can be mounted horizontally. 8
The fixed pedestal 8 is held at a constant height by a support spring 21 inserted between the movable pedestal 19a and the movable pedestal 19b. 22 is a stopper for regulating the descending range of the movable pedestal 19a, and 23 is inserted into a guide shaft 24 that penetrates the end of the movable pedestal 19b and stands upright on the fixed pedestal 8, as shown in FIG. , is a compression spring for suppressing the lowering of the movable pedestal 19b after the movable pedestal 19a comes into contact with the stopper 22, and has a stronger spring pressure than the pressure spring 17 or the support spring 21, and is normally connected to the movable pedestal 19b. Not in contact.

Reference numeral 25 denotes a movable plate 1 on the outside in the length direction of the pressurizing body 14b.
As shown in FIG. 7, the pressing plate is vertically disposed at 0, and its hanging length is set to such a length that when the movable pedestal 19a comes into contact with the stopper 22, it comes into contact with the other movable pedestal 19b. ing.

The lifting cylinder 18 is lowered by operating the valve V, and the lowering distance is determined by the intermediate and lower limit switches Lx, L.
t, and is raised by operating the valve (2), and the rising distance is limited by an upper limit switch (L).

Next, the operation will be explained.

When cutting the core steel strip 1 with the cutting device 6, the 12th
As shown in the electrical circuit diagram in the figure, when the power switch S is turned on, the movable plate 10 is held in its original position and presses the upper limit switch L, as shown in Figure 1, so the electromagnetic contactor 88M The energized circuit of is closed, and therefore,
Main contact 88M and auxiliary contact 88M1 of electromagnetic contactor 88M
- Closes and starts the electric motor 5 for driving the feed roller. As a result, the feed roller 4 rotates (see 4 in FIG. 13) to unwind the core steel strip 1 from the drum 2 and send it to the cutting device 6 as shown in FIG. The amount of feed of the iron core steel strip 1 is determined by detecting the number of rotations of a rotary roller 3a that is in sliding contact with the steel strip 1 using a row encoder 3, and sending a signal thereof to a counting device C. When a preset numerical value detection signal is input to the counting device C, a command signal from the counting bag WC (see C in Fig. 13) causes
B contact cb of counting device C opens, and a contact Ca closes.

Therefore, the main contact 88M1 of the electromagnetic contactor 88M is opened, stopping the activation of the electric motor 5, and stopping the feeding operation of the iron core steel strip 1 by the feeding roller 4. In addition, since the a contact Ca of the counting device C is closed, the valve ■ of the lifting cylinder 18,
The timers T, , 'rz are energized and the lifting cylinder 18 is driven to lower the movable plate 1o against the pressure and support springs 17 and 21 (see 10 in FIG. 13). At this time, although the timers T + and T z are energized, their timer contacts F+ 5 are not operating (see 1. and 1. in FIG. 13), and the movable plate 10 is energized as shown in FIG. , when it descends to a predetermined position (intermediate position) (see 10 in Figure 13)
, press intermediate limit switch L2 (L in Figure 13).
2), the energizing circuit of the valve V is opened to stop the lifting cylinder 18. Therefore, the movable plate 1o stops descending and cuts the iron core steel strip 1, which has been fed in a fixed amount to the cutting device 6, onto the pressurizing body 1o.
4a, 14b and movable pedestals 19a, 19b. That is, as the movable plate 1o descends, the pressurizing body 1
4a, 14b descend against the pressure spring 13 and come into contact with the movable pedestals 19a, 19b, as shown in FIG. are individually forcibly brought into contact with the surface of the core steel strip 1. Therefore, even if there is a thickness deviation in the core steel strip 1, the plurality of electrodes 16 individually contact the core steel strip 1 as shown in FIG. 9, thereby increasing the contact area with the core steel strip. Provided to increase the number of When a certain period of time (approximately 1 to 2 seconds) has elapsed after the iron core steel strip 1 is clamped, the timer T2 operates and closes its time contact [2], and when the electromagnetic contactor 88H is turned on and its main contact 88H8 is closed. , 1st
As shown in FIGS. 0 and 13, electricity is applied to the core steel strip 1 via the AC constant current device 30 and the electrodes 16. For this reason,
A current flows through the iron core steel strip 1, and as the current flows, an energy loss of I"R (1.current, R.resistance) occurs per unit time, which becomes normal heat (Joule heat), and the iron core steel strip 1. 1 (see 88H in Figure 13).

Then, when the heating temperature at the cutting position of the core steel strip 1 (point A-B in FIG. 10) reaches a temperature suitable for cutting after a certain heating time has elapsed, the timer TI operates and the timer contact j , 7 is opened and the electromagnetic contactor 88H is cut off to cut off the current to the core steel strip 1. At this point, the temperature near the cutting position of the core steel strip 1 (indicated by the dashed line in FIG. 14) is as follows. As shown by the dotted line in Fig. 14, all points are almost the same.

This is because, as mentioned above, electricity is supplied by arranging a plurality of electrodes 16 along the width direction of the core steel strip 1 with small gaps between them, so even if there is a thickness deviation, each electrode 16 This is because each of them is in strong contact with the core steel strip 1 due to the elastic force of the cushion material 15. Note that the two-dot chain line drawn in FIG. 14 shows the temperature distribution in an example in which the iron core steel strip was heated using an electrode made of a single plate, unlike the present example, and the plate thickness deviation was If this occurs, the contact area between the electrode and the steel core strip is extremely small (the current flowing through the steel core strip will flow only on the line connecting the electrodes that are in contact with the steel core strip among the opposing electrodes). Because the current does not flow, there are few parts through which the current flows, and the current flows locally in a concentrated manner, resulting in a high temperature in that part (on the other hand, the temperature rise in other parts is delayed due to thermal heating due to conduction). , the temperature distribution at the cutting position is not averaged.

Due to the operation of the timer T, its time contact 1. closes,
The energizing circuit of valve 1 is closed again to operate valve 1, and the lifting cylinder 18 is driven again to move the movable plate 10 to the third position.
Lower it further as shown. For this reason, the pressurizing body 1
4a and 14b are lowered against the force of the pressure spring 17° and the support spring 21 to bring the movable pedestal 19a into contact with the stopper 22 as shown in FIG. At this point, the iron core steel strip is cut with the lower blade cutter 1.
2, and the other movable pedestal 19b comes into contact with the compression spring 23, as shown in FIG. It is located just before contacting the pedestal 19b, and at this point the movable pedestal 1
9b, the movable plate 10 itself continues to descend in this state, and as shown in FIG. 4, when the upper cutter 11 comes into contact with the core steel strip 1, the pressing plate 25 moves as shown by the solid line in FIG. As shown, it comes into contact with the movable pedestal 19b. Although the movable plate 10 continues to descend and press down the pressurizing bodies 14a and 14b until the pressing plate 25 comes into contact with the movable pedestal 19b, one movable pedestal 19a hits the stopper 22 and the other movable pedestal 19
b is received by the compression spring 23 and does not fall, so the iron core steel strip 1 is placed on the lower cutter 12 and placed horizontally in the cutting device 6, as shown in FIGS. 3 and 4. The movable plate 10 is held and no mechanical distortion occurs due to the re-lowering of the movable plate 10. As mentioned above, the pressing plate 25 comes into contact with the movable pedestal 19b as the movable plate 10 descends, and in this state, the movable plate 10 is further lowered. When lowered, the movable pedestal 19b lowers while compressing the compression spring 23 by the pressing plate 25, as shown in FIGS. 5 and 8. That is, at the same time as the movable plate 10 descends, the movable pedestal 19b also descends, and as a result, the upper cutter 11 also moves to the fourth position.
It descends from the position shown in the figure and cuts the core steel strip 1. On this occasion,
The core steel strip 1 is heated to a temperature suitable for cutting, and the movable pedestal 19b also lowers at the same time as cutting, so the cutting process is smooth without cracking, chipping, or peeling of layers.

Can be cut well. (See lO in FIG. 13) After cutting the core steel strip 1, the movable plate 10 pushes the lower limit switch L3 (see L3 in FIG. 13) to open the energizing circuit of the valve v1, and the lifting cylinder 18 is temporarily stopped and the lowering of the movable plate 10 is stopped, and at the same time, the energizing circuit of the valve v8 and the reset circuit of the counting device C are respectively closed, and the elevating cylinder 18 is re-driven to lower the movable plate 10.
and resets the counting device C to open its a contact Ca (b contact cb is closed) and timer TI.

By opening the energizing circuit of T, the timers T + and T t
(10.jl+t in Fig. 13,
reference).

When the movable plate 1O rises to the normal position, the upper limit rim switch L is pressed (see Figure 13), the energizing circuit of the valve 2 is opened, the lifting cylinder 18 is stopped, and the movable plate 10 to the original position shown in FIG. Feeding device 6.

FIG. 16(A) is obtained by sequentially repeating such operations.

As shown in (B), a fixed-length core steel plate 1a, lb, which is made by heat-bonding a plurality of amorphous magnetic ribbons each having a right-angled or inclined notch at both ends, is continuously cut. Then, the core steel plates 1a and lb are laminated, respectively, and the first
5. Fabricate the laminated core 40.50 shown in Figures (A) and (B).

Although the embodiment has been described in which alternating current is applied when heating the iron core steel strip 1, the present invention is not limited to this, and it goes without saying that direct current may be applied to heat the core steel strip 1.

〔Effect of the invention〕

Since the present invention is configured as described above, it has the following effects.

(1) When cutting a heat-treated steel core strip made by laminating a plurality of amorphous magnetic thin strips and heat-bonding them into a predetermined size and shape, the present invention can cut the core steel strip on both sides of the cutting position. The structure is such that the core steel strip can be heated and cut at a substantially uniform temperature even if there is a deviation in the thickness of the core steel strip by bringing a plurality of electrodes placed into pressure contact with each other. This makes it possible to smoothly and effectively cut special core steel strips that have advanced embrittlement, and dramatically improve the productivity of core materials for laminated cores made of amorphous magnetic ribbons.

(2) Furthermore, when cutting the iron core steel strip, the cutting device uses an elastic member to horizontally hold the iron core steel strip from the time it is clamped until the end of cutting. No extra external force is applied to the cut section of the band, and no delamination or mechanical distortion occurs, so the core properties of the laminated core made by laminating cut core steel plates will not deteriorate. .

As explained above, the present invention can provide a cutting device that can effectively cut a core steel strip made of an amorphous 1titt ribbon with excellent magnetic properties.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view for explaining the schematic configuration of the cutting device according to the present invention, FIGS. 2 to 5 are longitudinal sectional front views for explaining the operating order of the cutting device, and FIG. A cross-sectional view taken along line A-A in the figure, Figure 7 is B-- in Figure 4.
A cross-sectional view at BaI2, FIG. 8 is a cross-sectional view taken along the line C-C in FIG. An explanatory diagram for explaining the case of heating the belt, FIG. 11 is an enlarged sectional view of the heating section, FIG. 12 is an electric circuit diagram of the cutting device, and FIG. 13
The figure is a time chart diagram for explaining the operation of the cutting device, Figure 14 is a temperature distribution diagram for explaining the heating state at the cutting position of the core steel strip, and Figures 15 (A) and (B).
16 is a perspective view of a laminated core laminated using core steel plates cut by the apparatus of the present invention, and FIG. 16 is a perspective view showing core steel plates cut by the apparatus of the present invention. 1. Iron core steel strip 6. Cutting device 11.12-Cutter 14a, 14b. Pressure body 1
6. Electrode 18. Lifting cylinder 19a, 1
9b - Movable pedestal patent application Jinchubu Electric Power Co., Ltd. Aichi Electric Co., Ltd. Figure 4 Figure 5 Figure 6 Figure 8 Figure 9 Figure 10 Figure 11 Figure 18 Figure 14 Figure 1-- E f Nobu-ichi→

Claims (1)

[Claims] A processing method in which multiple electrodes are arranged in parallel along the width direction of the core steel strip with a small gap between them on both sides of the cutting position of the core steel strip, which is made by laminating and bonding multiple amorphous magnetic thin strips and subjecting them to heat treatment. A pressure body is provided to be movable up and down, and each of the electrodes is brought into pressure contact with the core steel body individually by the pressure body, and each of these electrodes is connected to a power source to energize the core steel strip, and the core steel strip is heated. A cutting device for an iron core steel strip, characterized in that the cutting position is heated to a predetermined temperature before cutting.