JPS6047830B2 - Manufacturing method of stratified iron core - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a laminated core having a structure in which insulating coated iron core materials and non-insulating coated iron core materials are alternately stacked and integrated.

In a stratified core, it is required to use a core material such as a silicon steel plate with insulation coating on both sides to prevent eddy currents and reduce iron loss, but the insulation coating core material is different from the non-insulation coating core material. It is very expensive in comparison.

Incidentally, the core pieces that constitute the core of the laminated core are usually formed one by one using a progressive forge.

As is well known in the progressive die, a coil material is used as the strip and core pieces can be obtained at high speed. However, no matter how fast the core piece is produced, it cannot be manufactured to a specified thickness. Therefore, the core pieces that have been punched out one by one are stacked up and joined together using bolts, rivets, or welding, but this assembly process is extremely inefficient, making it possible to achieve ultra-high speed using progressive dies. This agreement has become a bottleneck that prevents the production of stratified iron cores from being rationalized. Under these circumstances, a technology was developed that uses a progressive die to form the core pieces, stack them, and swage them, and if necessary, also performs so-called skew processing, in which they are stacked with a predetermined twist angle. . In other words, although it has become possible to streamline production by laminating core pieces formed from either insulation-coated strips or non-insulation-coated strips, as mentioned above, the insulation is very expensive. The use of coated core material alone may not be economically acceptable. The use of only non-insulating coated iron core material is not allowed as it will not be possible to obtain a good quality product. Although this economical problem can be solved by stacking core pieces made of insulated core material and core pieces made of non-insulated core material alternately, in this case, the continuous work using a progressive die is unnecessary. Because it is possible, it is unavoidable to alternately stack separately produced core pieces made of insulated core material and core pieces made of non-insulated core material, and use methods such as bolts, rivets, or welding. At present, they are integrated into a product stratified core. An object of the present invention is to provide a method for highly efficiently producing a laminated core in which the core pieces made of the above-mentioned insulated core material and the core pieces made of non-insulated core material are stacked alternately in a mold. be.

According to the present invention, the above object is to simultaneously supply insulation coated iron core material and non-insulation coated iron core material to a mold,
This is achieved by crimping and integrating both core materials inside the portion that will become the outer edge of the core piece at an appropriate time before the core piece is cut into an outer shape.

Hereinafter, the present invention will be explained by way of examples with reference to the accompanying drawings.

First, as shown in FIG. 1, a metal strip 1 coated with an insulating material on both sides and a metal strip 2 not covered with an insulating material are placed one on top of the other. Cut and raised protrusions 3 on both sides of the
This process of punching out the metal strips 1 and 2 and integrating the two metal strips 1 and 2 may be performed outside the mold, or may be performed inside the mold.

Since the mold is usually a progressive die, the cut and raised protrusions 3 can be punched out very easily, for example at the first station. Furthermore, the metal strip 1
, 2 by the cut-and-raised protrusion 3 ensures that the two metal strips 1 and 2 are tightly connected to each other.
If it is possible to move by pitches, this is omitted. When the two metal strips 1 and 2 are not integrally connected by the cut and raised protrusions 3, a high degree of precision is required of the feeder for supplying the strips to the mold, but once inside the mold, The metal strips 1 and 2 are brought into a bonded state by various processing operations performed simultaneously at each station. Next, at one station in the mold, a protrusion 5 of an appropriate shape used for caulking for layering is punched into a predetermined position of the strip supply 4 obtained by overlapping the two metal strips 1 and 2. .

The protrusions 5 are usually provided at about four locations on the core component 6 to be punched out, as shown in FIG. In addition, the shape is assumed to be trapezoidal as shown in Figures 3 and 4, but when two pieces of the core are overlapped and pressed together, they are placed vertically above each other. The shape may be freely designed as long as the core components 6 can be combined as shown in FIG.
However, the amount of protrusion from the lower surface of the core component piece 6 when hammered out should not exceed the thickness of the upper metal strip, for example 1, and the sum of the thicknesses of the two metal strips 1 and 2. put. The amount of protrusion of the protrusions 5 is determined by the amount when a large number of core constituent pieces 6 are swaged in a die 9 by a punch 8 having a protrusion 7 corresponding to the protrusion 5 at the same time as the outer shape is punched out, as shown in FIG. Connection of adjacent pieces of each core component 6, connection of metal strips 1 and 2 constituting each core component 6, and holes 10 without protrusions 5 supplied when a predetermined layer thickness is obtained. The single core component 11 serves to make it possible for the subsequent core component 6 group to be uncoupled from the preceding core component 6 group. That is, the product laminated core 12 consists of the core components 6 which are sequentially superimposed on the core components 11 in the die 9.
The thickness of the core components starting from the core component 11 until the next core component 11 is supplied and superimposed on the group up to the core component 6 which is one core component before the next core component 11. As described above, the outer shape is cut out in the die 9 and simultaneously caulked with the projections 5.
The laminated core 12 is formed continuously with the lower surface of the core component 11 provided with holes 10 instead of the protrusions 5 serving as a separating surface, as shown in FIG. 6, by stacking the metal strips 1 and 2 alternately. It becomes something. According to the present invention having the above configuration, an insulating core component piece is caulked in a mold, and an iron core component piece formed of an insulating coated metal strip, a non-insulating coated metal strip, and an insulator can be used. Compared to overlapping each other one by one and connecting them with bolts, nuts, etc., an excellent effect can be obtained in that it not only reduces labor but also significantly reduces processing costs.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a part of an example of a strip used in carrying out the present invention, Fig. 2 is a plan view illustrating the progress of processing, and Fig. 3 is a plan view showing an enlarged view of an example of the caulking protrusion. Figure 4 is a sectional view taken along line 3, Figure 5 is a longitudinal sectional view illustrating the connection and separation of the core components within the die, and Figure 6 is a cross-sectional view of the core components formed according to the present invention. 1 is a partial vertical cross-sectional view of a laminated iron core. 1. Metal strip with insulation coating; 2.
...Metal strip without insulation coating, 3...
... cut and raised projection, 4 ... strip, 5 ...
...Protrusion for caulking, 6... Core component piece, 7
...Protrusion, 8...Punch, 9...
... Die, 10 ... Hole, 11 ... Core component piece, 12 ... Laminated core.

Claims (1)

[Claims] 1 Supplying strips to the mold for stratified bonding within the mold is to simultaneously supply insulation coated iron core material and non-insulation coated iron core material,
Before the outer shape is cut out, caulking protrusions are formed on the inner side of the outer edges of the core pieces to integrally connect the two plates of iron core material, and the caulking protrusions allow each of the cores to be joined together. A method of manufacturing a laminated iron core in which pieces are alternately stacked and fixed in a mold.