JPS6022816B2 - Manufacturing method for involute iron core - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing an impolite core.

2. Description of the Related Art An impolute core is known, in which a plurality of fixed-length steel plates are individually curved into an impolute shape and layered in a spiral shape.

The use of such an iron core as an iron core constituting a reactor with a gap was invented by the present inventor,
It is proposed separately. That is, as shown in FIG. 1, a plurality of impolute cores 1 are stacked together via a gap smoother 2 to form a columnar core 3, and a coil 4 is wound around the columnar core 3. The upper and lower ends of the plurality of parts are connected by a yoke 5 and integrated by a tightening stud 6. Note that 7 is a fixing band for the iron core 1. When such iron "○" is used, there are various advantages such as reducing loss due to eddy current, preventing local heating, and improving space factor. By the way, in order to manufacture this type of iron core, conventionally, a steel plate is bent into an impolute shape using a single cutting die designed in advance in an impolute shape, and then the steel plates are individually layered in a spiral shape. was. However, with this method, not only is it necessary to prepare an impolite-shaped cutting die, but also the steel plates must be bent individually using the cutting die, and the processed steel plates must be layered one after another. Therefore, its production was extremely troublesome. In order to solve this problem, the following manufacturing method has been invented and separately proposed by the present inventor.

As shown in Fig. 2, a small-diameter ring 11 is prepared, one end of a plurality of steel plates 12 is fixed by welding along its outer periphery, and each steel plate 12 is arranged radially in parallel with the ring 11. In addition, a plurality of push-out arms 14 each having a rotary loaf 13 at the tip are arranged along the outer edge of the steel plate 12, and each steel plate is slowly rotated by rotating it with a rotating shaft A iron-coupled to the ring 11. In this method, the extrusion arm 14 is gradually moved toward the rotation axis of the ring 11. According to this method, the tip of the steel plate 12 comes into contact with the roller 13 at the beginning of rotation of the ring. As a result, the extrusion arm 1 begins to curve around the fixed point with the ring 11, and as this curve progresses, the extrusion arm 1
4, the curvature progresses further, and when the steel plates 12 are finally bent to the extent that they are in close contact with each other, each steel plate is curved into an impolite iron core shape, as shown in Fig. 3. At that time, the roller 13 comes into contact with the outer end of the steel plate 12. As can be understood from the above description, each steel plate can be easily bent into an impolute shape by simply moving the extrusion arm 14 while rotating the ring 11, and therefore, this type of iron core can be easily processed and formed. become able to. Instead of the push-out arm 14, a rope may be wrapped around it and pulled. However, as a practical matter, when each steel plate 12 is fixed to the ring 11, there is no gap around the outer periphery of the ring 11, and one end of the steel plate to be fixed must be parallel to the center of the ring 11. Menkubi is made by arranging steel plates in a positional relationship.

An object of the present invention is to enable easy and accurate setting of the positional relationship of a steel plate with respect to a ring.

An embodiment of the present invention will be described with reference to the drawings. In FIGS. 4 and 5, reference numeral 15 is a base, and a hole 16 is formed in the center of the base. A plurality of holes 17 and the same number of holes 18 are formed along concentric circles, and pins 19 and 20 are inserted into each of the holes 17 and 18 on the base 1.
5 and is fixed with nuts 21 and 22.

The adjacent spacing P between the pins 19 and the adjacent spacing P' between the pins 20 are set to be equal. In order to hold the steel plate side by side using the above-mentioned base, the steel plate 12 is placed on the base between the adjacent pins 19 and between the mutually adjacent pins 20 located at the positions corresponding to the pins 19. 15, insert it so that it is upright. In this case, a plurality of steel plates are inserted so that there are no gaps between the inserted steel plates. In the configuration prototyped by the inventor, the pin spacing is 4.
On the 9th side, the number of sheets inserted was 14. After inserting the steel plate 12 across all the pins 1 and 20 (this may be done before inserting the steel plate 12), place the ring 11 on the base 15 so that its center is perpendicular to the base 15. installed on the surface of Then, each steel plate 2 is pressed so that its inner end is in contact with the outer peripheral surface of the ring 11. At this time, the number of steel plates is predetermined so that the inner surfaces of the steel plates 12 are in close contact with each other across the entire outer circumference of the ring 11 and no gaps are formed. Since the pins 19 and 20 are established perpendicularly to the base 15, the steel plates arranged in parallel on the surface of the base 15 as described above are parallel to each other and are all perpendicular to the base 15. The condition will be maintained.

Furthermore, since the axis of the ring 11 is perpendicular to the base 15, the steel plate becomes parallel to the center of the ring 11. While maintaining this positional relationship between the ring 11 and the steel plate 12, the outer peripheral surface of the ring 11 and the inner end of the steel plate 12 are fixed by welding. Since there is actually no gap between the steel plates, the upper and lower inner ends of the steel plates 12 are welded and fixed to the outer peripheral surface of the ring 11. By fixing in this manner, a structure as shown in FIG. 2 can be manufactured. After that, transfer this to another base equipped with an extrusion arm 14, and while rotating the ring 11, attach an extrusion arm (or rope, etc.) to the steel plate 12 from its outer end inward.
Use this to apply external force, and you will be able to produce Impolute Iron 0. If pins 19 and 20 of different diameters are used in the configurations shown in FIGS. 4 and 5,
The interval between each pin is changed, and the number of steel plates inserted between the pins can be changed arbitrarily.

This is extremely effective in that when rings 11 having different outer diameters are used, the number of steel plates fixed to the rings will also differ. Further, in the above embodiment, pins are used, but instead of this, a plurality of grooves extending radially around the hole 16 are formed in the base 15 so that the depth direction is the same as that of the base 1.
The grooves may be formed perpendicularly to the grooves 5 and arranged side by side by iron-coupling steel plates to the grooves. In this case, in order to easily maintain the vertical state of the steel plate, another base is prepared parallel to the surface of the base 15, and the lower green and upper edges of the steel plate are placed in the grooves of both bases. It is a good idea to do so. As detailed above, according to the present invention, the impolus
When manufacturing a steel core, the inner ends of multiple steel plates are fixed to the outer circumferential surface of the ring and attached radially around the ring, making it possible to accurately and easily align each steel plate to the ring. This has the effect of making it extremely easy to manufacture this type of impolite core.

[Brief explanation of drawings]

Fig. 1 is a front view showing an example of the use of an impolute core, Figs. 2 and 3 are plan views showing processing and forming conditions, Fig. 4 is a plan view of the base used in this invention, and Fig. 5 is It is a front view of the base with the left half section taken. 11...Ring, 12...Steel plate, 15...Base, 19, 20...
pin. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. A ring is installed on the base so that the axis is perpendicular to the base, and a pin or groove is formed to maintain the steel plate perpendicular to the surface of the base, and the ring is centered. A plurality of the steel plates are arranged radially side by side, and the inner ends of each steel plate are brought into contact with and fixed to the outer peripheral surface of the ring, and then, while rotating the ring, the steel plates are attached from the outer end to the inner end. A method for manufacturing an involute iron core, wherein the steel plate is curved into an involute shape by applying a directed external force.