JPS63132412A - Punching-out method of strip material for semicircular cross-section wound core - Google Patents

Abstract

PURPOSE:To increase the efficiency of working by a method wherein, when a plurality of iron core strip materials with which almost semicircular cross-section will be obtained when it is rolled up on a mold is going to be punched out continuously, the punch-out line between the adjoining strip materials is formed into a curved line having a gentle slope or a straight line. CONSTITUTION:The edge 21a on one side of the material 21, which is the continuous long-sized material of uniform width of wound-core material, is in the state of a straight line, the other side of the material is cut out along the prescribed curved line 21b, and the wound-core strip material 22 is cut out continuously into a plurality of pieces of cores. (The longitudinal direction is shown by reducing to one five hundredth in the diagram.) The cut-out line linking the largest width part (the part which becomes the diameter of semicircular cross-section when rolled up to a mold) of each strip material 22 and the smallest width part of the adjoining other strip material 22 is formed into the curved line 21 having a gentle slope. For example, if the 21c part is formed in the length of 5 cm or thereabout against the overall length of 20 cm of the strip 22, a continuous cutting work can be performed without stopping a slitter device even on the connecting part of the largest width part and the smallest width part, and the efficiency of working can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wound core of a transformer to which a cylindrical coil bobbin is applied.

[Conventional technology]

Recently, circular cross-section cores, which have the advantages of being ultra-thin, compact, and lightweight, have come to be used as wound cores for transformers to which cylindrical coil bobbins are applied (Reference: Japanese Patent Publication No. 60-2
Publication No. 8375, Publication No. 61-22851, Japanese Unexamined Patent Publication No. 1983
132057), that is, as shown in Figure 3, the wound core l is obtained by winding a strip material with excellent magnetic properties that has been cut out in a predetermined shape in the width direction in accordance with the shape. , its cross section is circular. A cylindrical coil bobbin 2, which has been divided into two in advance, is pressed against the winding core l at the pressure contact surface 3, and by rotating this coil bobbin 2 with respect to the winding core 1, the coil bobbin 2 is
A winding (not shown) is applied to the wire. Therefore,
In this case, the gap 4 between the wound core 1 and the coil bobbin 2 becomes smaller, and excellent magnetic properties are obtained. For example, the wound core shown in FIG. 3 has a rectangular shape as shown in FIG.

From the standpoint of material utilization efficiency and ease of cutting work, the method for cutting out the band material for the circular cross-section wound core described above is to leave one side of the straight edges of the material straight and the other side into a predetermined curve. Already known are the method of cutting along two predetermined curves (as shown in Figure 5), or the method of cutting along two predetermined curves while leaving both straight edges of the material straight (as shown in Figure 6). (Reference: Japanese Patent Publication No. 61-22851).

[Problem that the invention seeks to solve]

However, the above-mentioned cutting method cannot be applied to the single-phase outer iron type semicircular cross-section wound cores 11, 12 or 8 shown in FIG.
When applied to the outer core 13 and inner core 14, 15 (both have semicircular cross sections) of the tripod type three-phase wound core shown in the figure, the strip material will be cut out as shown in Figure 9 or Figure 1O. As a result, the arrow X or the first
As shown by arrows Y and Z in Figure 0, when a sharp cutting angle occurs and the slitter is used to cut out the area, the slitter is stopped and other means are used to cut out the area.
.

It is necessary to cut out the parts shown in Y and Z, and considering that the slitter device operates continuously at a speed of 200 m/min or more, this results in a significant decrease in work efficiency, and as a result, the transformation There was a problem in that it led to an increase in the manufacturing cost of the device (wound core).

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a method for cutting out a band material for a semicircular cross-section wound core with good work efficiency.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention provides that, when cutting out along curved lines to obtain a substantially semicircular cross section, a straight line and/or a gently sloped line is formed between the curved lines of the cutout. By cutting out along the curve, strips for a plurality of wound cores are continuously obtained.

[For production]

According to the above-mentioned means, a plurality of semicircular cross-sections of iron core strips can be obtained continuously without stopping the slitter device.

〔Example〕

1 and 2 are plan views of a material for explaining a method of cutting out a band material for a semicircular cross-section wound core according to the present invention. In Fig. 1(A), a material 2 with straight edges is shown.
One side edge 21a of 21.1 remains straight, and the other side has a predetermined curve 21.1. Cut out along b. As a result, a plurality of strips 22 are obtained. Note that the predetermined curve 21b is defined by the band material 22.
When the core is wound into a predetermined shape, a wound core 11, 12, or 13 having a semicircular cross section as shown in FIG. 7 or 8 is obtained. According to the invention, each curve 21. b along a straight line and/or a gently sloped curve 21c. Note that the length of the cut out strip 22 is actually about 500 times the width, so the curve 21C
As shown in the enlarged view of FIG. 1(B), the curve is a very gentle curve including a straight line. For example, for a strip with a total length of 20 m, the gently sloped curved part is 5 cm.
It is sufficient if it is about n, and it is sufficient to wrap this part as a wound core without cutting it off, and there is little loss of i members. As a result, the slitter device (see Japanese Patent Publication No. 60-28375, Japanese Unexamined Patent Publication No. 132027) can perform continuous cutting along the curves 21b and 21c without stopping.

In FIG. 2, the edges 31a and 31b on both sides of the raw material 31, which has straight edges, remain straight and are simultaneously cut out along two predetermined curves 31G and 31d.

As a result, a plurality of strips 32 and 33 are obtained. In this case, the uneven portions of the rows of the plurality of strips 32 are made to correspond to the uneven portions of the rows of the plurality of strips 33, thereby increasing the utilization efficiency of the material.

The cutting method shown in Figures 1 and 2 is based on the
This can be easily carried out using the slitter device disclosed in Japanese Patent Application Laid-open No. 0-28375 or Japanese Patent Application Laid-Open No. 132027.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to obtain a band material for a wound core with a semicircular cross section that has good work efficiency.

[Brief explanation of the drawing]

1 and 2 are material plan views illustrating the method of cutting out a strip material for a semicircular cross-section wound core according to the present invention; FIG. 3 is a sectional view showing a circular cross-section wound core equipped with a conventional coil bobbin; Figures 4 (A) and (B) are a plan view and a cross-sectional view of a general rectangular wound core, and Figures 5 and 6 are band materials illustrating the method of cutting out the band material for the wound core in Figure 4. Plan view, Figures 7(A) and (B) are plan views and cross-sectional views showing a general single-phase external iron type wound core, and Figures 8(A) and (B) are general three-phase wound cores. A plan view and a cross-sectional view showing the iron core. FIGS. 9 and 10 are plan views of a strip illustrating a method of cutting out the semicircular cross section of FIGS. 7 and 8 into a strip for the core. 11-15...Semicircular cross-section wound core, 21, 31...Material, 22, 32, 3
3... Belt material.

Claims (1)

[Claims] 1. When cutting out a strip material for a semicircular cross-section wound core, one side of both linear edges of the material remains straight, and the other side of the material is cut out by the strip material. Cut out along a curve that will give a predetermined approximately semicircular cross section when it is cut out and wound into a predetermined mold, and a straight line and/or a gentle slope between the cut out curves. A method for cutting out a strip material for a semicircular cross-section wound core, in which a plurality of strip materials for a wound core are continuously obtained by cutting along a curve. 2. When cutting out the strip material for the semicircular cross-section wound core, keep both straight edges of the material straight, so that when the strip material is cut out and wound into a predetermined shape, The convex part and the concave part are cut out simultaneously along two curves facing each other such that a substantially semicircular cross section is obtained, and between the cut out curves is cut out along a straight line and/or a gently sloped curve. A method for cutting out a strip material for a semicircular cross-section wound core, in which a plurality of strip materials for a wound core are continuously obtained by cutting out the material.