JPH08242560A - Cutting edge of press blanking die for rotor core of rotary machine - Google Patents

Abstract

PURPOSE: To provide a cutting edge constitution of a press blanking die having guide sections which prevent the occurrence of burrs when the cutting edges are moved for cutting operation in the case of manufacturing the rotor core of a rotary machine by using the cutting edge. CONSTITUTION: Projecting sections 61a and 61b which are protruded from both end faces of the punch 4 of a press blanking die used for manufacturing the rotor core of a rotary machine are provided to a guide section 6 provided for the punch 4 so that the side face sections of the sections 61a and 61b can be slid and put on the side face sections of inserting sections for inserting the guide 6 of the die cutting edge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single press stamper for manufacturing a rotor core plate of a rotating electric machine in which a plurality of slot portions having openings are formed on the outer diameter side of a fan-shaped segment of electric steel plate. The present invention relates to the structure of a cutting tool.

[0002]

2. Description of the Related Art FIG. 3 shows a rotor core plate.
FIG. 4A is a top view of a press punching upper die for manufacturing a conventional rotor core plate, FIG. 7A is a plan view, and FIG. 5 is an explanatory view of manufacturing a rotor core plate by using the upper die for the punching die of FIG. 4, and FIG. 6 is a VI-VI sectional view of FIG. Rotor cores for induction motors, cylindrical synchronous machines, etc. have a structure in which rotor electric core plates with a slot portion for mounting a rotor coil formed on a thin electric steel plate made of a silicon steel plate are laminated in a cylindrical shape. Has been adopted. This cylindrical rotor core plate is manufactured by a total punching method in which a plurality of slots are integrally pressed from a sheet of electrical steel sheet with a press-punching die tool, and a pair of press punches. There are two types of single punching method, which is a single press punching die tool consisting of an upper die tool and a lower die tool for which a slot portion is sequentially provided in the circumferential direction. When the outer diameter of the rotor core is large, as shown in FIG. 3, the rotor 1 is obtained by punching the slot portion 1 into a fan-shaped segment obtained by dividing the electrical steel plate into several parts in the circumferential direction of the rotor iron core with a press punching tool. Make the core plate 2,
The rotor core plates 2 are alternately laminated so that both ends thereof are not concentrated and do not overlap with each other, and the rotor core plates are laminated in a circular shape to manufacture a rotor core. The electrical steel sheet has a thickness of 0.5 to
The width of the opening portion 3 of the slot portion 1 that is 0.7 mm and opens on the outer diameter surface side of the rotor core plate 2 holds the rotor coil inserted through and attached to the slot portion 1 via a wedge (not shown). Therefore, the width of the slot portion 1 is made narrower than that of the slot portion 1.

Both the total punching method and the single punching method described above are applied to the punching by the press punching blade for forming the slot portion 1 in the segment of the electric steel sheet. The size of the rotor core is different from the standard product,
When the number of rotor core plates is not large, the rotor core plates may be manufactured with a single press punching die. An upper die tool 4 for a press punching die for producing the rotor core plate 2 shown in FIG. 4 includes a slot punching portion 4a for punching the slot portion 1 having the opening 3 and having a rectangular cross section in FIG. An outer diameter punching portion 4b protruding rightward is provided, respectively. The upper die cutter 4 for the press punching die is fixed to an upper die cutter blade mount 9 shown in FIG. 6 described later, and the lower die cutter 5 fitted to the upper die cutter 4 is the bottom die shown in FIG. It is fixed to the die blade mounting base 10 to form a press punching die.

Next, a method of manufacturing the rotor core plate 2 having a plurality of slot portions from the electric steel plate of the fan-shaped segment by the above-mentioned single press punching die will be described. The outer diameter surface of the upper die cutter 4 for press punching is punched so that the predetermined outer diameter surface 2a of the rotor core plate 2 is located on the outer diameter side of the electrical steel sheet punched and cut into fan-shaped segments. Part 4
Aligning with b, the upper die blade 4 is pressed in the A direction as shown in FIG. 6 to punch the slot portion 3 (FIG. 3). Upper die blade 4 when cutting with a press die die
And the gap L between the lower tool 5 and 3/100 to 4/100 m
By setting m, it is possible to prevent the occurrence of burrs on the minute projections of the electrical steel sheet on the punched cut surface, and to manufacture the rotor core plate 2 having a good finished outer diameter. Note that FIG.
FIG. 4 is a diagram in which a slot portion 1 is punched on the left end side of a segment of an electrical steel sheet.

The upper die blade 4 includes an outer diameter portion 2 of an electric steel plate.
As shown in FIGS. 4 (a) and 4 (b), a guide portion 6 projecting toward the lower die cutter 5 is provided at a position located outside b. Then, the guide side surface portion 6a on the upper side of the figure and the guide side surface portions 6b and 6c on both end surfaces of the guide portion 6 correspond to the insertion portion 11 for inserting the guide portion provided in the lower die cutter 5. Sliding on each side surface, upper die blade 4
While maintaining the gap between the side surfaces of the lower mold tool 5 and the lower mold tool 5 at the above-mentioned predetermined value, the upper mold tool 4 is introduced into the lower mold tool 5 and fitted and cut. There is. After punching the slot portion 1 into the electrical steel sheet as described above, the right end portion in the figure of the portion punched by the outer diameter punching portion 4b of the above-mentioned punching die for press is next punched. The electric steel sheet is moved in the direction of the arrow at a position where it overlaps with 1/2 of the width dimension S of the slot portion indicated by the alternate long and short dash line, and the slot portion 3 is punched while the tooth portion 7 having a predetermined width is provided. After that, punching is sequentially performed to form a predetermined number of slot portions 1 as shown in FIG.

[0006]

By the way, the guide portion 6 for introducing the above-mentioned conventional upper die blade 4 into the lower die blade 5 is
A configuration in which the guide side surface 6a on the upper portion of the guide portion 6 and the guide side surface portions 6b and 6c on both end surfaces slide on each side surface portion of the insertion portion corresponding to each guide side surface portion of the lower die cutter 5. Has become. Therefore, the horizontal movement of the upper mold tool 4 in FIG. 5 is caused by the guide side surfaces 6b and 6c and the insertion part 1 of the lower mold tool 5.
Since it is constrained by each side surface of 1, the upper die blade 4 at the time of pressing
The dimensions of the left and right gaps between the lower die cutter 5 and the lower die cutter 5 can be kept constant. However, as shown in FIG. 6, in the vertical direction of the upper die blade 4, the upper die blade 4 has a side surface portion 6a of the guide portion 6 and a side surface portion of the insertion portion 11 of the lower die blade 5 corresponding thereto. Slides and is introduced into the lower die blade 5, so that the upper die blade 4 moves in the direction of arrow B in the figure by the lateral pressure from the side surface portion 5a of the lower die blade 5 during press cutting, 4, the gap L between the lower die 5 and the lower die 5 is narrowed, and burrs, which are minute protrusions of the electrical steel sheet, are formed on the cut surface between the slot bottom portion 1a and the outer diameter surface 2a of the rotor core plate 2 after cutting shown in FIG. There was a problem that became large.

The presence of burrs on the rotor core plate 2 causes damage to the insulating layer of the rotor coil inserted and mounted in the slot of the rotor core obtained by laminating the rotor core plates 2 described above. Not only that, conduction due to contact with the adjacent rotor core plate 1 may cause partial overheating of the iron core due to an increase in eddy current of the rotor core plate 2 and may promote thermal deterioration of the rotor coil. is there. Therefore, it takes a lot of time for the deburring work to prevent the damage of the rotor coil and the abnormal overheating of the iron core. Further, since the presence of burrs on the rotor core plate 2 may damage the blade portion due to the scoring between the upper die blade 4 and the lower die blade 5, the polishing work of the press punching die tends to increase. It was

An object of the present invention is to prevent burrs from being generated on the bottom of the slot and the outer diameter surface of the rotor core plate when the rotor core plate is punched and manufactured by a press punching tool for electric steel plates which solves the above problems. It is intended to provide a press-punching die blade having a guide portion capable of being prevented.

[0009]

In order to solve the above problems, the present invention is used in a press punching die comprising an upper die tool and a lower die tool for punching a slot portion in a rotor core plate of a rotating machine. A slot punching portion that punches a slot portion that opens to the outer diameter side of the rotor core plate and an outer portion that punches a part of the outer diameter surface of the rotor core plate that is continuous with the opening portion of the slot portion. A blade part consisting of a diameter punching part, a guide part provided on the upper mold tool for introducing and fitting the upper mold tool at a predetermined position of the lower mold tool, and a lower mold tool inserting this guide part With the insertion portion provided, while wrapping the opening portion of the slot portion on the outer diameter surface punched by the outer diameter punching portion in the fan-shaped segment of the electrical steel sheet forming the rotor core plate, For a single-type press punching die that punches one slot at a time, Guide portions was found is provided on the tool has a rectangular cross section projection projecting from the left and right end surfaces of the upper tool post,
Each guide side surface portion of this guide portion is configured to be slidably fitted to each side surface portion of the insertion portion into which the guide of the lower die cutter is inserted.

[0010]

According to the present invention, in the press-punching die, the upper die is introduced into the lower die by the guide side surface portions of the guide portions on the left and right end surfaces of the conventional upper die and the insertion portion of the lower die. In addition to the mating configuration, the guide parts provided on the upper die cutter are provided on both left and right end surfaces of the upper die cutter so as to hold the gap between the upper and lower blades in the radial direction of the rotor core plate. A projecting portion having a rectangular cross section that projects from is provided. As a result, the vertical side surfaces of the protrusions protruding from the left and right end surfaces of the upper die cutter of the guide portion are slidably fitted to the corresponding side surface portions of the lower die cutter insert portion. Since it fits, it is possible to keep the gap between the left and right side and top and bottom side surfaces of the upper and lower knives uniform, and the upper dies move in one direction during press punching. It is possible to prevent the occurrence of burrs due to the reduction in the gap size of the lower die cutter.

[0011]

EXAMPLES The present invention will be described below based on examples.
1A and 1B are outline views of an upper die for a press punching die of a rotor core plate of a rotating machine according to an embodiment of the present invention, in which FIG. 1A is a front view and FIG. Is. Further, FIG. 2 is an explanatory view of manufacturing an electric steel sheet by a punching die blade of FIG. The drawings correspond to FIGS. 4 and 5 of the related art, respectively, and the same parts as those of the related art are denoted by the same reference numerals and detailed description thereof will be omitted.
In the upper die cutter 4 for the press punching die shown in FIG. 1, as in the conventional case, the lower die cutter 5 is projected at a position located outside the outer diameter surface 2b of the electric steel plate of the upper die cutter 4, A guide portion 6 that fits into the insertion portion of the blade 5 is provided. The guide portion 6 has a rectangular cross-section with left and right ends having protrusions 61a, 61a protruding from both end faces of the upper tool 4, respectively.

The procedure for producing the rotor core plate 2 by punching an electric steel sheet with the press punching die according to the present invention is performed as described in the above-mentioned conventional example. That is, as shown in FIG. 2, an electric steel plate punched and cut into fan-shaped segments is attached to the outside of the upper die cutter 4 for the press punching die so as to be located on the outer diameter surface 2a of the rotor core plate 2 having a predetermined size. Diameter punching part 4
The rotor core plate 2 having a predetermined shape is manufactured by aligning with b and punching. Next, a tooth portion 7 having a predetermined gap width is provided so that the right end portion of the portion punched by the outer diameter punching portion 4b wraps up to ¼ of the width of the next punched slot portion 1. First, move the electrical steel sheet in the direction of the arrow and punch it.

In order to fit the upper die cutter 4 in a predetermined position of the lower die cutter 5 when punching the above-mentioned electric steel plate, the surface of the slot punched portion 4a and the outer diameter punched portion 4b in FIG. The projecting guide portion 6 is carried out by slidingly introducing each side surface portion of the insertion portion, which is fitted in correspondence with the guide portion 6 provided on the lower die cutter 5, into the guide portion 6. That is, the guide portion 6 provided on the upper mold tool 4 of this embodiment has a rectangular cross-section having projecting portions 61a and 61b projecting from the left and right end surfaces of the upper mold tool 4, respectively. A guide side surface portion 6a positioned in the up-down direction of the guide portion 6 of the blade 4, guide side surface portions 6d and 6e of the protruding portions 61a and 61b opposed to the guide side surface portion 6a, and right and left of the guide protruding portions 61a and 61b. Each of the guide side surface portions 6b and 6c slides on each side surface portion of the insertion portion of the lower mold tool 5 provided corresponding to these guide side surface parts, and the upper mold tool 4 is moved to the lower mold tool 5's side. It is introduced into a predetermined position and fitted. Therefore,
In addition to the guide side surface portions 6b and 6c for preventing the conventional upper cutter 4 from moving in the left-right direction, as described above,
Since the blades are positioned by a and the guide side surface portions 6d and 6e and the side surface portions of the lower die blade 5, the upper die blade 4 in the radial direction of the rotor core plate 2 can be moved vertically. Also, it is possible to uniformly maintain the gap size between the upper die blade 4 and the lower die blade 5 at the time of fitting.

[0014]

As described above, according to the present invention, the structure of the guide portion provided on the upper die in the press die for the die for punching the rotor core plate of the rotating machine produced by punching the electric steel plate is as follows. As a rectangular shape projecting from both left and right end surfaces of the upper mold tool, each guide side surface part of this rectangular guide part slides on each side surface part of the insertion part into which the guide of the lower mold tool is inserted, and The blade was introduced into the lower die. As a result, the upper die does not move vertically during press punching as in the conventional case, so that the gap between the upper die and the lower die can be kept uniform when the rotor is rotated. It is possible to prevent burrs from being generated at the bottom of the radial direction of the core plate and the cut surface of the outer diameter surface. Therefore, deburring work of the rotor core plate for avoiding partial overheating of the iron core due to increase of eddy current in the rotor core of the rotating electric machine due to burr generation and mechanical damage to the rotor coil is required. It is not necessary, and the man-hours for manufacturing the rotor core and the manufacturing time can be reduced. Furthermore, since it is possible to prevent the occurrence of galling between the upper and lower mold knives due to burrs,
It is possible to reduce the number of times of polishing of the press die cutting tool.

[Brief description of drawings]

1A and 1B are shape diagrams of an upper die for a press punching die of a rotor core plate of a rotary machine showing an embodiment of the present invention, in which FIG. 1A is a plan view and FIG. It is a figure.

FIG. 2 is an explanatory view of manufacturing a punched rotor core plate with the upper die tool of FIG.

FIG. 3 is a plan view of a rotor core plate.

FIG. 4 is a shape diagram of an upper die for a conventional punching die for a rotor core plate, in which (a) is a plan view and (b) is (a).
FIG.

5 is an explanatory view of manufacturing a punched stator core plate with the upper die cutting tool of FIG. 4. FIG.

6 is a cross-sectional view taken along the line VI-VI of FIG.

[Explanation of symbols]

 1 Slot Part 2 Rotor Iron Core Plate 3 Opening Part 4 Upper Die Tool 4a Slot Punching Part 4c Outer Diameter Punching Part 5 Lower Die Tool 6 Guide Part 6d Guide Side Part 6e Guide Side Part 61a Projection Part 61b Projection Part

Claims (1)

[Claims] 1. A rotor punch of a rotating machine, which is used for a press punching die including an upper die and a lower die for punching a slot on a rotor core plate and punches a slot open on the outer diameter side of the rotor core plate. The lower die is a lower die with a blade portion including a slot punching portion for punching and an outer diameter punching portion for punching out a part of the outer diameter surface of the rotor core plate continuously with the opening of the slot portion. The rotor core plate is provided with a guide portion provided on the upper die blade for introducing and fitting the blade portion at a predetermined position and an insertion portion provided on the lower die blade for inserting the guide portion. A single-type press-punching tool for punching the slot portions one by one while wrapping the opening portion of the slot portion on the outer diameter surface punched by the outer diameter punching portion on a fan-shaped segment of electrical steel sheet , The guides provided on the upper mold tool protrude from the left and right end surfaces of the upper mold tool. It has a projecting portion having a rectangular cross section, and each guide side surface portion of the guide portion is slidably fitted to each side surface portion of the insertion portion for inserting the guide of the lower die cutting tool. Rotary machine rotor Iron core plate press punching die.