JPH0123931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for cutting steel pieces for radial cores.

For example, as shown in Fig. 1, a three-phase reactor is constructed by winding a coil 2 around each of three leg cores 1, and magnetically shorting the upper and lower ends of each leg core 1 with a yoke 3. Ru. In this case, a plurality of disc-shaped cores 4 are used as the leg cores 1, and spacers G made of non-magnetic material are used as the leg cores 1.
They are stacked together to form a cylinder. As the iron core 4, a so-called involute iron core formed by bending a steel plate into an involute curve shape may be used, but a radial iron core may also be used. The radial core is manufactured in the shape shown in FIG. 2, and includes steel pieces 5 having different lengths (including pieces having different lengths for each piece or for each piece of steel; the same applies hereinafter). ) are stacked in a fan shape to form a fan-shaped iron core block 6, and a plurality of the core blocks 6 are arranged radially in sequence to form a disk shape.

3 and 4 show details of the iron core block 6, in which steel pieces 5 of different lengths are arranged with their outer ends arranged in a straight line or in an arc (an arc that coincides with the outer circumference of the iron core 4). They are constructed by stacking them in parallel.
The steel pieces 5 are obtained by sequentially cutting raw steel sheets that have been previously rolled into rolls using a cutting machine. In this case, as shown in the cutaway diagram in FIG. 5, the width of the raw steel plate 7 (however, the direction of easy magnetization is the direction of the arrow μ. Therefore, this direction is also the rolling direction of the raw steel plate, that is, the length direction). It is convenient to set in advance equal to the sum l of the respective lengths la and ln of the longest steel piece 6A and the shortest length steel piece 6N among the steel pieces constituting the core block 6. That is, first, the raw steel plate 7 is sequentially cut into pieces W having a constant width (the length of this width corresponds to the thickness of the iron core 4) in its width direction. The rectangular, e.g., strip-shaped steel plates 8A to 8N obtained by this cutting are then cut in the width direction of the steel plate (the length direction when viewed from the original steel plate 7), and at this time, the cutting length is For the first steel plate 8A, the required length ln from one edge 8' to the steel plate 6N, then
One of the steel pieces obtained by cutting can be used as a steel piece 6A, and the other steel piece can be used as a steel piece 6N'. As the next steel plate 8B, the edge 8'
The length from 1 to 6 is the same as the length required for the second longest steel piece 6B among the steel pieces constituting the core block 6, and the steel piece is cut in the same manner. The steel pieces obtained by this cutting can be used as the second longest steel piece 6B and the second shortest steel piece 6M' of the steel pieces constituting the core block 6, respectively.

Thereafter, each of the steel plates 8A to 8N is sequentially cut in the same manner with different cutting lengths, and when the steel plates 6A to 6N are obtained by cutting the number of steel plates required to construct one iron core block 6, Steel pieces 6A'~ required to construct another iron core block 6
6N' can be obtained at the same time. In other words, if each steel plate 8A to 8N is cut as described above, by cutting one steel plate, a piece of steel for one core block 6 and a piece of steel for another core block 6 are cut. This allows you to obtain both pieces at the same time. The number of steel pieces required to manufacture one iron core block is usually from several to over 100 pieces.

However, when each steel plate 8 is cut as described above, there are the following drawbacks as a practical problem. That is, in general, a cutting machine for this type of steel plate 8 is provided with an upper blade 9 and a lower blade 10 as shown in FIG. 6, and the upper blade 9 is lowered after the steel plate 8 is transferred between the two blades. Cut the steel plate 8. Now steel plate 8
If it is assumed that is being transferred in the direction of arrow P,
If the distance from the edge 8' to the upper blade 9 is short,
(In other words, if the cutting length is short), the piece of steel that rests on the lower blade 10 is long, so it can be cut without any problem, but as the cutting points are sequentially shifted, the distance from the edge 8' to the upper blade gradually increases. The remaining steel piece resting on the lower blade 10 becomes shorter. When the last steel plate is cut, the length of the remaining steel piece will be ln. In order to make the above-mentioned radial core 4 as circular as possible, it is desirable that the center angle of the fan-shaped core block 6 is as small as possible. The length ln of the steel pieces 6N and 6N' becomes shorter, and some of them are, for example, several mm.
It is almost impossible to cut such a short piece of steel with a normal cutting machine.

The purpose of this invention is to easily cut a raw steel plate to obtain steel pieces of different lengths used to construct a radial core using an ordinary cutting machine. shall be.

Embodiments of the present invention will be described with reference to FIG. 7 and subsequent figures. In this invention, as shown in FIG.
First, it is sequentially cut into strip-shaped steel plates 8A to 8N having a width W. Next, these steel plates are cut into steel pieces 6A~
6N, as shown in the cutaway diagram in Figure 7, the first steel piece 8A has a length from one edge 8'.
Cut at ln. Thereafter, cutting is performed in the same manner at different lengths (the cutting length is gradually decreased), but for the steel slab 8I in the center among the steel slabs 8A to 8N, this is cut to the middle length at the top. If cutting is to be performed at l _i , the lengths from the edge 8' of the steel slabs 8I onwards are cut at points that are successively shorter than l _i (cutting lengths are made shorter). Then, the last steel piece 8N is cut at a length ln from the end edge 8'. This cutting location is exactly the same as the cutting location of the first steel piece 8A.

By cutting in this way, steel pieces for two iron core blocks 6 can be obtained by cutting one steel plate as in FIG. 5, and each steel piece 6A to 6N
When cutting, the length of the piece of steel placed on the lower blade 10 is half the length of the steel plate at its shortest, so it can be easily cut with a normal cutting machine. Even if a presser metal fitting 11 is provided that moves integrally with the upper blade 9, as shown in FIG. Therefore, the steel plate can be cut reliably.

In order to cut each of the steel plates 8A to 8N, it is preferable to move the cutting machine sequentially in the length direction of the steel plates 8A to 8N. In this case, compared to the case of cutting as shown in Figure 5, the moving distance of the cutting machine is approximately half, and when cutting as shown in Figure 5, after cutting the final steel plate 8N, the cutting machine must be returned to its initial position, but the seventh
When cutting as shown in the figure, the cutting position of the final steel plate 8N is the same as the cutting position of the first steel plate 8A, so there is no need to return the cutting machine to the initial position. Instead of moving the cutting machine, the cutting machine may be installed at a fixed position, and the feeding positions of the respective steel plates transferred thereto may be made to be sequentially different from each other.

FIG. 9 shows a specific example for this purpose. The raw steel plate 7 wound into a roll is unwound and first cut into steel plates 8 by a cutting machine 13 at equal intervals along its width. This steel plate 8 is then fed in its longitudinal direction (in the direction of the arrow) and cut in its width direction by a cutting machine 14. At this time, the steel plate 8 is fed until its tip touches the stopper 15. Then, it is cut by the cutting machine 14 at the hit position. The stopper 15 is sequentially moved forward or backward by a predetermined distance in the direction of the arrow. Cutting machine 1
When moving forward toward 4, move from steel plate 8I to steel plate 8N.
It will be easily understood that this is the case when cutting from the steel plate 8A to the steel plate 8I when moving backward. The steel pieces cut by the cutter 14 and the remaining steel pieces are stacked one after another by being distributed from side to side to form each core block. Even in this case, the movement distance of the stopper 15 may be half the length of the steel plate 8, and the final steel plate 8N
There is no need to return it to its original position after cutting it.

As mentioned above, each steel piece may have a different length in sequence, and these pieces may be stacked to form an iron core block.
Furthermore, as shown in FIG. 10, the iron core block 6 may be constructed by using several pieces of the same length as the steel pieces on both sides, or as shown in FIG. The iron core block 6 may be constructed by stacking the pieces or by sequentially stacking shorter steel pieces on both sides thereof. The example shown in FIG. 11 is an example in which a plurality of steel pieces having different lengths are used. In any case, if you want to obtain a plurality of steel pieces with different lengths, use a plurality of steel plates 8 instead of the cutaway diagram shown in Fig. 7.
What is necessary is to obtain a steel billet by changing the cutting length each time.

As described in detail above, according to the present invention, when obtaining steel pieces of different lengths for the core blocks constituting the radial core, it is possible to reliably and easily cut a rectangular steel plate. In addition, the moving range of the cutting machine or the stopper can be reduced to half the length of the steel plate, and both the forward and backward movements of the moving range can be used to set the cutting location.

[Brief explanation of drawings]

Fig. 1 is a front sectional view of a three-phase reactor to explain an example of the use of a radial core, Fig. 2 is a perspective view of the radial core, and Fig. 3 is a plan view of a part of the radial core.
FIG. 4 is a plan view of the iron core block, FIG. 5 is a general cutting diagram of a steel plate, FIG. 6 is a side view showing a cutting state according to the cutting diagram of FIG. 5, and FIG. 7 is an embodiment of the present invention. A cutaway diagram of the steel plate. FIG. 8 is a side view showing the cutting state according to the cutaway diagram of FIG. 7. FIG. 9 is a perspective view illustrating a series of cutting steps. FIGS. FIG. 7 is a plan view showing another example. 4...Radial core, 6...Iron core block, 6A~6
N, 6A'~6N'...Steel piece, 7...Raw steel plate, 8,8A
~8N...square steel plate, 13,14...cutting machine.

Claims (1)

[Claims] 1 A fan-shaped core block is created by sequentially stacking multiple pieces of steel with different lengths, and these core blocks are used for a radial core that is constructed by radially arranging the core blocks in an approximately circular shape. In this method, a raw steel plate is first cut at equal intervals in the width direction to obtain a rectangular steel plate, and then each steel plate is cut along the width direction so that the cutting length is first cut. When the steel plate is cut in half, the cutting length of each subsequent steel plate is changed to become shorter, and each of these steel plates is cut. A method of cutting a steel piece for a radial core so as to obtain each of the above-mentioned steel pieces.