JPH04320312A - Manufacture of transformer iron core - Google Patents

Abstract

PURPOSE:To achieve automation and enable influence due to dimensions of an iron core block to be reduced in manufacture of a step-shaped joint portion of an amorphous transformer iron core. CONSTITUTION:While an edge portion of a plurality of iron core blocks 2 where an amorphous magnetic thin band which is an iron core material is laminated is clamped, it is folded by an angle of theta from a horizontal state, a clamp 3b is released and is extended horizontally, thus forming a step-shaped joint portion and enabling a required length to be manufactured by repeating the same procedure.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a stepped joint of a step-wrap core for an amorphous transformer.

0002

2. Description of the Related Art FIG. 1 shows an example of a step lap wound core. The iron core 1 consists of a plurality of iron core blocks 1b in which amorphous magnetic ribbons 2 are laminated, and each iron core block 1b
The joints are staggered in a stepped manner and are arranged on one side 1a of the iron core 1. When the iron core block 1b is wound around the iron core 1, the joint becomes step-like, so it is necessary to shift the end face of the joint in advance by a predetermined amount in a step-like manner. In FIG. 2, (B) shows the iron core block 2b with one end of the joint end face aligned in order to shift the core block 2a by a predetermined amount in a stepwise manner. Figure 3 is an example of conventional manufacturing;
By winding the iron core block 2b shown in (B) of FIG. 2 directly from the end, the iron core block 2a with the joint end face shifted by a predetermined amount in a stepwise manner as shown in (A) of FIG. 2 is manufactured. Was.

0003

[Problem to be solved by the invention] Conventionally, a stepped joint was manufactured by winding an iron core block, but amorphous magnetic ribbons had thickness deviations, and the ribbons were piled up. When winding an iron core block, there were effects due to plate thickness deviations, such as the core popping out in a spiral pattern. In addition, as the amount of winding increases, the center of the winding shifts, making it difficult to control the amount of deviation of the stepped joint and mechanize it, so that manufacturing is mainly done by hand. It is an object of the present invention to be able to manufacture a step-like joint by mechanization while being hardly affected by the plate thickness deviation.

0004

[Means for Solving the Problems] In order to achieve the above object, in this invention, the joint end faces of the iron core blocks are aligned,
Make it into a flat plate, clamp the end face of the core block, bend a part of the core block at a certain angle while it is clamped, remove the clamp, straighten it immediately, and repeat the above steps to create a stepped joint. Manufacture.

[0005] As a result of the above, effects such as protrusion caused by overlapping of the iron core blocks with thickness deviations can be reduced, and the center of bending can be fixed by the method of bending and stretching, which facilitates mechanization.

[0006]

[Operation] The core block has a difference in length between the inside and outside of the core, but with this invention, even if the length or width of the core block changes, it can be clamped at the end face of the core block in the same way. By bending, unclamping and stretching, it is possible to manufacture stepped joints of iron core blocks. The stepwise shift amount can be changed by changing the bending angle and number of times.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 4 shows an example of an apparatus for implementing the manufacturing method of the present invention. Bending and stretching table 3a attached to main body 6
is equipped with a clamp 3b so that the angle can be changed freely and the iron core block 2 can be clamped. The sliding presser 5 is a plate that is attached to the main body 6 and has a smooth contact surface so that the iron core block 2 is pressed against the main body 6 and that the iron core block 2 is movable in the longitudinal direction.
rollers are installed. The sliding presser foot 5 has a weaker clamping force than the clamp 3b. The bending and stretching table 3a is set horizontally with the main body 6, and with the clamp 3b and the slide presser 5 open, the iron core block 2 with its end surfaces aligned is placed horizontally at a position where it can be clamped from the main body 6 with the clamp 3b. The iron core block 2 is clamped horizontally with a clamp 3b, and the surface is pressed with a sliding presser foot 5. In this state, the bending and stretching table 3a is tilted to an angle θ (degrees). At this time, the iron core block 2 is placed on the bending and stretching table 3a with the clamp 3
It is bent because it is clamped at b. When bent, the core block 2 shifts by the thickness of the core plate. Since the sliding presser foot 5 has a weaker clamping force than the clamp 3b, the core can be displaced by the amount that the core block 2 is pulled by the clamp 3b. When the bending is completed to the angle θ (degrees), the clamp 3b is released. With the clamp 3b released, the bending and stretching table 3a is made horizontal again. At this time,
The iron core block 2 is clamped by a sliding presser 5, and is stretched horizontally in a shifted state. Here, a step-like deviation occurs, and the deviation length l (mm) is calculated as follows: l (mm) = 2πt (mm) x θ (degrees) / 360, where the thickness of the iron core block is t (mm). (Every time)
becomes. The calculated deviation length L (mm) can be manufactured using the bending and stretching angle θ (degrees) and the number of times N (times).
It is expressed as L (mm)=N2πt×θ (degrees)/360 (degrees).

[0008]

[Effects of the Invention] Since the principle is simple: clamp and bend, unclamp and stretch, it is possible to automate the machine and achieve significant labor savings. There are almost no restrictions such as plate thickness deviation or core block length and width. A step shift can also be performed at the same position.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a step lap wound core.

FIG. 2 is a diagram showing an example of an iron core block.

FIG. 3 is a diagram showing a conventional manufacturing method.

FIG. 4 is a diagram showing an example of an apparatus for implementing the manufacturing method of the present invention.

[Explanation of symbols]

2 Iron core block 3a　Bending and stretching table 3b Clamp 5 Sliding foot 6 Main body θ Bending angle

Claims (1)

[Claims] Claim 1: An amorphous magnetic ribbon is used as the core material, the core is composed of a plurality of core blocks each laminated with the core material, and the joints of each core block are staggered in a stepped manner, and the joints are The method for manufacturing a step-lap transformer core arranged on one side of the core includes a step of aligning the joint end faces and clamping one end face of a flat core block, and a step of clamping a part of the core block while being clamped. A transformer comprising a step of bending at a certain angle, a step of immediately stretching and shifting the joint after removing the clamp, and a step of repeating each of the above steps a certain number of times to produce the necessary step-like deviation of the core block joint. Iron core manufacturing method.