JPH08168214A - Duct piece for forming cooling path of laminated core and manufacturing method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a duct piece and a method for producing the same, which does not produce a large amount of scrap material, can be manufactured in a short time, and can also share a punching blade, and which is low in cost. A projection 13 having a height B for projection welding is provided on one piece of a duct piece 12 having a width A, and a depth B having the same shape and the same size as the projection 13 is provided at the same position in the longitudinal direction of the opposite piece. In the press punching device, a plate-like material having a width corresponding to the length of the duct piece 12 in the longitudinal direction is provided in the press punching device.
It is manufactured by punching with a punching tool while feeding it one by one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct piece for forming a cooling path of a laminated iron core of a rotating electric machine such as a generator or an electric motor, and a method for manufacturing the duct piece.

[0002]

2. Description of the Related Art In a laminated iron core of a rotary electric machine such as a generator or an electric motor, in order to remove heat generated during operation and maintain a predetermined temperature, the core is divided into a plurality of parts and a gas refrigerant is passed through the gap. A cooling method is often used.
FIG. 3 is a vertical cross-sectional view showing the basic structure of a laminated core of a rotary electric machine of this type. The laminated core 1 is divided into a plurality of parts by interposing a duct piece 2 for forming a cooling path, and is cooled by passing cooling air through the gap formed by the duct piece 2.

FIG. 4 is a plan view of a duct piece for forming a cooling path of a conventional laminated iron core. The duct piece 2 is in the form of a long rectangular plate having a length and a width corresponding to the height and gap of the laminated iron core, and a plurality of pieces for welding and joining to the laminated iron core by projection welding are formed on one piece in the longitudinal direction. A protrusion is provided. FIG. 5: is explanatory drawing which shows the manufacturing method of the duct piece for forming the cooling path of the conventional laminated iron core. Duct piece 2
Is manufactured by a method of punching the material 6 one after another using a press punching device.

[0004]

As described above, in the laminated iron core of the conventional rotary electric machine, the predetermined cooling path is formed by using the duct piece 2 having the shape as shown in FIG. 4 punched by the press punching device. are doing. However,
When the duct piece 2 of this shape is used, as shown in FIG. 5, when the duct piece 2 is punched out from the material 6 in a punching process, a large amount of the end material 4 is produced, resulting in a high manufacturing cost. There were difficulties.

Further, since the duct piece 2 is punched corresponding to its shape to be manufactured, if the shape of the duct piece 2 changes, for example, even if only the width A changes, a new piece is added each time. There was a problem that a blade for press punching was required. The object of the present invention is to prevent the generation of a large amount of scrap material, to shorten the manufacturing time, and to manufacture a duct piece which changes only the width A by using the same press-punching blade, which can be manufactured inexpensively. A duct piece for forming a cooling path for a laminated core and a method for manufacturing the duct piece.

[0006]

In order to achieve the above object, according to the present invention, a laminated iron core of a rotating electric machine is divided into a plurality of laminated portions, and a gas refrigerant is passed through the gap between the laminated iron cores. A duct piece having a substantially rectangular plate shape for forming a cooling path for cooling a plurality of protrusions used for welding with a laminated iron core is formed on one side in the longitudinal direction, and the above-mentioned is formed at the same position in the longitudinal direction on the opposite side. It is configured by forming a recessed portion having the same shape and size as the protruding portion.

Further, a plate-shaped material having a width equal to the length of the duct piece in the longitudinal direction is applied to the duct piece in a direction orthogonal to the longitudinal direction by using a press punching device. It will be manufactured by punching with a punching tool while feeding in the same length as.

[0008]

As described above, the plurality of welding projections are provided on one side in the longitudinal direction, and the recesses having the same shape and size as the above-mentioned projections are provided at the same positions in the longitudinal direction on the opposite sides. If a duct piece for forming a cooling path is configured, when a plate-shaped material is punched and formed using a blade for press punching, the next step is to correspond to the recess or protrusion formed in the punched material. If the duct pieces to be punched out are aligned and punched out, it is possible to reduce the amount of scrap material generated when punching out a plurality of duct pieces one after another, or to eliminate them.

In particular, by using a press punching device, a plate-like material having a width that is the same as the length of the duct piece in the longitudinal direction is cut by the same length as the width of the duct piece in the direction orthogonal to the longitudinal direction. If it is manufactured by punching with a punching tool while feeding, the next duct piece will be punched in conformity with the dents or protrusions formed in the punched material, so no scraps will occur. Become.

When a cooling path is formed in a laminated iron core by using the duct piece having the above-described structure, a recessed portion that does not contact the iron core is formed on the side of the duct piece opposite to the welded portion installation side. It suffices that the support be in contact with the welded portion at a length corresponding to the welded portion, and the function as the cooling passage forming duct piece is not impaired.

[0011]

1 is a plan view of a duct piece for forming a cooling path of a laminated iron core according to the present invention. The duct piece 12 has a plate shape having a long rectangular flat surface with a width A, and a projection 13 having a height B for welding and joining to a laminated iron core is formed on one piece in the longitudinal direction by a projection welding method. There is. Further, in the other facing piece, the same number of recesses 15 of the depth B having the same shape and size as the protrusions 13 are formed at the same position in the longitudinal direction as the protrusions 13.

FIG. 2 is an explanatory view showing a method of manufacturing a duct piece for forming a cooling path of a laminated iron core according to the present invention, and shows a method of manufacturing the duct piece 12 shown in FIG. 1 by press punching. Duct piece 12 for press punching device
A pair of punching blades 7A and 7B having a blade shape matching the shape of the longitudinal piece of the above is installed, and a predetermined plate having a width equal to the length of the duct piece in the longitudinal direction is provided on the punching blade 7B. Punching blade 7 while feeding thick material 6 by length A which is the same as the width orthogonal to the longitudinal direction of the duct piece
It is manufactured by pressing A and punching it downward.
Since the recessed portion 15 of the other piece facing the projection portion 13 of the one piece of the duct piece 12 has the same shape and the same size, if it is manufactured by punching while feeding each length A as described above, a scrap material is generated. Is completely eliminated and the material yield is greatly improved. Further, since there is no leftover material, there is no need for a conventional processing operation of the leftover material, and the time required for manufacturing is greatly shortened. Therefore, if the duct piece 12 shown in FIG. 1 is manufactured by this manufacturing method, it can be manufactured at low cost in terms of material and working time.

Further, if the recess 15 of the other piece facing the projection 13 of the one piece is a duct piece having the same shape as the duct piece 12, even if the width A of the duct piece changes,
If the material is punched out while feeding the material in lengths corresponding to the width, it is possible to manufacture using the same press-punching blade, which further reduces the manufacturing cost.

[0014]

As described above, according to the present invention, the laminated iron core of the rotary electric machine is divided into a plurality of laminated portions, and a gas refrigerant is passed through the gap to cool the laminated iron core. A duct piece in the shape of a substantially rectangular plate is formed on one side in the longitudinal direction with a plurality of protrusions used for welding with a laminated iron core,
Since it was decided to form a recess with the same shape and size as the above-mentioned protrusion at the same position in the longitudinal direction on the opposite side, punching out a plate-shaped material using a blade for press punching. In doing so, if the duct pieces to be punched next are aligned and punched out in correspondence with the recesses or protrusions that have been formed in the punched material, the end material generated when punching multiple duct pieces one after another is generated. Since the amount is small or none, the material yield is greatly improved,
It has become possible to inexpensively manufacture a duct piece for forming a cooling path of a laminated core.

Further, the duct piece for forming the cooling path of the laminated iron core is pressed with a press punching device to form a plate-shaped material having a width equal to the length of the duct piece in the longitudinal direction. If a method of punching with a punching tool is used while feeding the same length as the width in the direction orthogonal to the longitudinal direction, there will be no scraps, and the yield of material will be greatly improved. Since the required time is also significantly reduced, the duct piece for forming the cooling path of the laminated iron core can be manufactured at low cost. In addition, if this manufacturing method is used, if the concave portion of the other piece facing the protruding portion of the other piece is a duct piece having the same shape, it can be used even if the height of the duct piece changes. By punching while feeding the material, it is possible to manufacture using the same press-punching blade, further reducing the manufacturing cost of the duct piece for forming the cooling path of the laminated core. Becomes

[Brief description of drawings]

FIG. 1 is a plan view of a duct piece for forming a cooling path of a laminated iron core according to the present invention.

FIG. 2 is an explanatory view showing a method for manufacturing a duct piece for forming a cooling path of a laminated iron core according to the present invention.

FIG. 3 is a vertical cross-sectional view showing the basic structure of a laminated core of this type of rotary electric machine.

FIG. 4 is a plan view of a duct piece for forming a cooling path of a conventional laminated iron core.

FIG. 5 is an explanatory view showing a conventional method for manufacturing a duct piece for forming a cooling path of a laminated iron core.

[Explanation of symbols]

 1 Laminated Iron Core 2 Duct Piece 3 Protrusion 4 End Material 6 Material 7A Punching Blade 7B Punching Blade 12 Duct Piece 13 Projection 15 Recess

Claims (2)

[Claims] 1. A duct piece in the form of a substantially rectangular plate for forming a cooling path, in which a laminated iron core of a rotary electric machine is divided into a plurality of laminated portions, and a gas refrigerant is passed through the gap to cool the laminated iron core. A plurality of protrusions used for welding with the laminated iron core are formed on one side in the longitudinal direction, and a recess having the same shape and the same size as the protrusion is formed at the same position in the longitudinal direction on the other opposing side. A duct piece for forming a cooling path of a laminated iron core, which is characterized in that: 2. A plate-shaped material having a width that is the same as the length of the duct piece in the longitudinal direction is formed by using a press punching device and has the same length as the width of the duct piece in the direction orthogonal to the longitudinal direction. The method for producing a duct piece for forming a cooling path of a laminated core according to claim 1, wherein the duct piece is punched by a punching blade while being fed in.