JP2001016832A - Method of blanking iron core plates with press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve productivity of blanking iron core plates, made of electrical steel sheets by feeding strips that are rewind from coils to a press in a state that a plurality of the strips are stacked, and by blanking the strips on the press to obtain a plurality of iron core plates simultaneously. SOLUTION: Roll feeds 17, 19 are driven intermittently to rewind strips 15 from two reel stands 13, 14 and the strips 15 are fed to a press 11 in a state that the strips 15 are stacked. At each stage of a progressive die 12, each blanking process predetermined is performed so that two pieces of iron core plates are obtained simultaneously. This structure can improve productivity of the blanking, by which the iron core plates of given dimensional accuracy is obtained from the strips 15 made of the electric steel sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a laminated iron core of a rotating machine such as a motor and an iron core plate having a required shape for forming a laminated iron core of an EI or CI transformer and a reactor by pressing. It relates to a method of obtaining by punching.

[0002]

2. Description of the Related Art In general, high efficiency is required in a rotary machine for energy saving, and in order to reduce eddy current loss during iron loss, a high resistivity of a material of an electromagnetic steel plate as a material of an iron core plate is required. It is effective to reduce the thickness of the electromagnetic steel sheet with the development of the electromagnetic steel sheet. Therefore, recently, an electromagnetic steel sheet having a thickness of 0.35 mm or less has been increasingly used. Similarly, in transformers and reactors, magnetic steel sheets thinner than 0.3 mm, which has been conventionally used, have been increasingly used for higher efficiency for energy saving.

However, taking an example of a rotating machine as an example, in order to obtain a core plate for forming a laminated iron core such as a rotor and a stator by punching out this electromagnetic steel plate by a press, a conventional method is to rewind the coil from a coil. Since one magnetic steel strip was supplied to the press and core sheets were punched one by one, the number of core sheets punched out increased significantly with the above-mentioned thinning, resulting in a time required for core plate punching. And it has been difficult to improve productivity.

[0004]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned conventional problems, and provides a method for punching an iron core plate by a press which improves the productivity of the punching work for obtaining the iron core plate. The purpose is to do.

[0005]

According to a first aspect of the present invention, there is provided a method for punching an iron core plate by a press, comprising:
A plurality of sheets are supplied to a press in a stacked state, and a plurality of iron core plates are simultaneously obtained by punching the strips in the stacked state in this press.

In the present invention, as the strip, a strip made of various magnetic thin plates such as an amorphous magnetic alloy steel strip can be used in addition to the electromagnetic steel strip.

According to the first aspect of the present invention, punching is performed by a press in a stacked state in which a plurality of strips are stacked, so that the number of core sheets punched per unit time is one strip. Compared to punching, the width is greatly increased, and the productivity of core plate punching is improved.

In the present invention, various types of coils wound around a strip can be used as the coil.
As in the invention described above, if the coil is configured by a coil formed by winding a single band plate, a general single-wound coil can be used (a plurality of coils are prepared) and the coil can be used. Has the advantage of being easily available.

Further, if the coil is constituted by a coil wound in a state in which a plurality of strips are stacked, the number of coils and therefore the installation space of the coil holding device are reduced. In a slitter line in which a thin plate is cut (slit) by a slitter and wound around a coil, productivity can be improved in the cutting step by stacking and cutting a plurality of thin plates at the same time.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to a first example shown in FIGS. FIG. 1 shows a product punched by the method of the present invention, 1 is a core plate for forming a stator core of a small motor, and 2 is a core plate for forming a rotor core, respectively, for a winding or a rotor. It has a general shape including slots 3 and 4 for forming conductors, holes 5 for inserting bolts, shaft holes 6, and the like.

FIG. 2 shows an apparatus for punching the iron core plate. In the figure, reference numeral 11 denotes a press comprising a crank press, which has a progressive feed die 12. Reference numerals 13 and 14 denote reel stands (uncoilers), which are strips 1 made of one electromagnetic steel strip.
The coil 16 formed by winding 5 is held so as to be rewound. 17 is a roll feed on the sending side,
Reference numeral 18 denotes a winding stand for winding the remaining material hoop after punching, 19
Is a roll feed on the winding side.

Next, a description will be given of a punching method by the above-mentioned apparatus. The roll feeds 17 and 19 are intermittently driven to rewind the band plate 15 from the two reel stands 13 and 14 and to carry out the punching method.
The sheet is supplied to the press 11 in a state where the sheets are stacked. In each stage of the progressive die 12, punching such as punching of the center hole 6 of the iron core plate 2, punching of the slot 4 and outer diameter, punching of the hole 5 of the iron core plate 1, slot 3 and inner diameter punching, and outer diameter punching are performed. After processing, two iron core plates 2 which are products
And two iron core plates 1 are simultaneously obtained. The punched iron core plates 1 and 2 are discharged from below the progressive die 12 to the side of the press by a conventional method, but illustration thereof is omitted.

In the first stage of the progressive die 12, for example, two pilot holes are punched at a position near the edge of the strip 15 which does not interfere with the punching position of each iron core plate. (With pilot pin inserted in pilot hole)
Performing each punching process while positioning the position 5 is preferable because the displacement of the two band plates can be prevented and the position of the band plate can be accurately positioned at each stage.

A specific example of the punching by the above-mentioned apparatus is as follows. An iron core plate 1 having an outer diameter of 108 mm and an outer core having an outer diameter of
The core plate 2 having a diameter of 300 mm per minute is punched out of a core plate 2 having a predetermined dimensional accuracy with a small amount of burrs.
It could be obtained in the ratio of one sheet. On the other hand, in the punching process from one strip plate 15 unwound from only one coil 16 according to the conventional method, each of the iron core plates 1 and 2
Only one sheet can be obtained, and according to the present invention, the productivity of the iron core plate is greatly improved to twice.

FIG. 3 shows a second embodiment of the present invention. In the drawing, the same parts as those in FIG. 2 are denoted by the same reference numerals, and the detailed description thereof will be omitted. In this example, one coil 21 in which two wide strips are cut by a slitter in a slitter line and cut by a slitter and two strips 15 and 15 made of an electromagnetic steel strip are wound in a stacked state. The remaining material hoop after punching is sheared in the final stage of the progressive die 12 and is discharged as a perforated square plate-like scrap material below the press. The installation of each device on the winding side in 1 becomes unnecessary.

Also in this example, the strips 15 are supplied to the press 11 in a stacked state of two sheets, and the two cores 1 and 2 are stamped out in the same manner as in the first example. It can be obtained at the same time. Since only one reel stand needs to be provided, the installation space is small.

The present invention is not limited to the above examples. For example, in the above example, two strips 15 are punched in a laminated state, but three or more strips 15 are similarly laminated. Punching may be performed in the state. In addition, strip 15
Depending on the size and material of the reel stand or the type of the reel stand, a slack portion of the band plate 15 is provided between the reel stand and the roll feed 17, and a loop controller for holding the slack amount is provided. The device configuration may be other than the above.

When the iron core plates 1 and 2 have a crimped portion such as a V-shaped notch or a circular concave and convex shape in order to secure the alignment between the iron core plates when forming the laminated core and to secure the lamination strength. The processing of these caulked portions can be performed simultaneously with the above-mentioned punching process (on another stage or the same stage of the progressive die 12), and the present invention can be applied to a case other than the punching process. Is what is done. In the above, the laminated iron core of the motor was explained,
The present invention is also applicable to punching of an iron core plate for forming a laminated core of a transformer and a reactor having an EI shape or a CI shape.

[0019]

As described above, according to the present invention,
The core strip is obtained by performing punching with a press on the stacked strips that are unwound from the coil and a plurality of stacked strips, so that the productivity of the punching of the core strip is improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an iron core plate showing an example of an embodiment of the present invention.

FIG. 2 is a front view of an apparatus for punching the iron core plate of FIG. 1;

FIG. 3 is a front view of another apparatus for punching the iron core plate of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... iron core plate, 2 ... iron core plate, 11 ... press, 12 ... progressive type, 13 ... reel stand, 14 ... reel stand, 1
5 band strip, 16 coil, 17 roll feed, 21
…coil.

Claims (3)

[Claims] 1. A plurality of strips unwound from a coil are fed to a press in a stacked state in which a plurality of strips are stacked. And a method for punching an iron core plate by a press. 2. The method according to claim 1, wherein the coil comprises a coil formed by winding a single strip. 3. The method according to claim 1, wherein the coil comprises a coil wound with a plurality of strips stacked.