JP2003053445A - Blanking method for sheet metal component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing sheet metal components, a method enabling sheet metal components to be smoothly collected without causing deflection in the base thin metallic sheet. SOLUTION: In the blanking method in which a plurality of sheet metal components are successively blanked in the longitudinal direction from the base sheet 1 composed of a long thin metallic sheet, there is formed by press forming a reinforcing part 2 for increasing rigidity of a scrap part 15 which remains in the base sheet when the sheet metal components are blanked, in the process concurrent with or prior to the blanking process.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for punching a thin metal part from a thin metal plate.

[0002]

2. Description of the Related Art Conventionally, as a method for extracting thin metal parts such as a motor core sheet base material from a thin metal plate, FIG.
As shown in FIG. 4, a progressive press working method is known in which a long thin metal base plate 1 is fed in the longitudinal direction to sequentially punch out products having a desired shape. In this progressive press working method, after a product having a desired shape is punched from the base plate 1, the base plate 1 is lifted upward by a guide lifter 4 and a block lifter 5 provided on a lower die 6 in the longitudinal direction. Forward to. The progressive press working method is a method of continuously collecting the thin plate metal part from the thin plate metal part collection port 65 provided in the lower die 6 by repeating this series of operations.

[0003]

However, when the base plate 1 is a very thin plate material and a thin metal part having a relatively large outer diameter is punched out from the base plate 1, the base plate 1 remains on the base plate side. Bending occurs in the scrap portion 15 to be removed.
In particular, the boundary portion 151 located between the punching positions is likely to be bent. In this case, the scrap part 1 above
The flexure generated in the boundary portion 151 when advancing 5 is caught in the thin plate metal component sampling port 65, or the full width of the base plate is reduced due to the occurrence of the flexure, so that the base plate is removed from the guide lifter 4. There was a risk of coming off.
Therefore, the progressive press working method could not be continuously performed in some cases.

The present invention has been made in view of the above conventional problems, and a punching method for a thin metal part capable of smoothly collecting a thin metal part without causing a bending of a base plate of the thin metal plate. Is to provide.

[0005]

According to a first aspect of the present invention, there is provided a punching method in which a plurality of thin metal parts are sequentially punched out from a base plate made of a long thin metal plate in the longitudinal direction. A punching method for a thin sheet metal part is characterized in that a reinforcing portion for increasing the rigidity of the scrap portion is formed in the scrap portion remaining on the side at the same time as or before the punching step. 1).

In the present invention, as described above, the reinforcing portion is formed on the scrap portion at the same time as or before the punching. As a method of forming the reinforcing portion, there is a press molding method, for example. Therefore, when a thin metal part is stamped from the base plate of the thin metal plate, the rigidity of the scrap portion is significantly improved as compared with the conventional one due to the existence of the reinforcing portion. Therefore, the flexure of the scrap portion is suppressed by the existence of the reinforcing portion. Therefore, it is possible to prevent the trouble at the time of progressive feeding of the original plate due to the bending of the scrap portion, and it is possible to smoothly perform the continuous punching of the thin sheet metal parts.

As described above, according to the present invention, it is possible to provide a method of manufacturing a thin sheet metal component capable of smoothly collecting the thin sheet metal component without causing the base plate of the thin sheet metal plate to bend.

A second aspect of the present invention is a punching method in which a plurality of thin metal parts are sequentially punched and sampled in a longitudinal direction from a base plate made of a long thin metal plate, and the thin metal parts remain on the base plate side when punching. A pair of claws provided by bending a part of the base plate at a substantially right angle are previously provided at both end portions of the boundary portion located between the front and rear punching positions adjacent to each other in the longitudinal direction. When advancing the scrap portion after forming and punching the thin sheet metal part, tension is applied so as to separate the pair of claw portions outwardly from each other, and advance is performed while suppressing the bending of the boundary portion. A method for punching a thin sheet metal part, characterized in that (claim 8).

In the present invention, as described above, a pair of claw portions are provided at both end portions of the base plate before punching the thin metal part. Then, after punching the thin sheet metal part, tension is applied to the scrap portion by pulling the pair of claw portions outward. This tension resists the gravity applied to the base plate itself. Therefore, the occurrence of bending of the base plate can be suppressed. Therefore, it is possible to prevent the trouble at the time of progressive feeding of the original plate due to the bending of the scrap portion, and it is possible to smoothly perform the continuous punching of the thin sheet metal parts.

As described above, according to the present invention, it is possible to provide a punching method for a thin sheet metal component which can smoothly collect the thin sheet metal component without causing a bending of the base plate of the thin sheet metal plate.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the first invention (claim 1), the reinforcing portion has a right-angled portion formed along a direction substantially perpendicular to the longitudinal direction of the base plate. Preferred (Claim 2). The right-angled portion is, for example, shown in FIGS.
As shown in FIG. 6, the reinforcing portion is provided in the scrap portion of the base plate and is a portion that is provided substantially at right angles to the longitudinal direction of the base plate. In this case, the bending that occurs in the width direction of the base plate can be suppressed.

Further, it is preferable that the reinforcing portion has a parallel portion formed along a direction substantially parallel to the longitudinal direction of the base plate (claim 3). For example, as shown in FIG. 6 described later, the parallel portion is a reinforcing portion provided in the scrap portion of the base plate and is a portion provided so as to be substantially parallel to the longitudinal direction of the base plate. In this case, the bending that occurs in the longitudinal direction of the base plate can be suppressed.

Further, it is preferable that the reinforcing portion has an inclined portion formed obliquely with respect to a longitudinal direction of the base plate (claim 4). For example, as shown in FIG. 1 described later, the inclined portion is a reinforcing portion provided in a scrap portion of the base plate, and is a portion provided so as to be oblique with respect to the longitudinal direction of the base plate. In this case, the bending that occurs in the longitudinal direction and the width direction of the base plate can be suppressed at the same time.

Further, it is preferable that the reinforcing portion has a round portion that surrounds the whole or a part of the punched outer shape of the thin plate metal component in an arc shape (claim 5). The round part above is
For example, as shown in FIGS. 7 to 9 which will be described later, it is a reinforcement portion provided in the scrap portion of the base plate and is a portion provided so as to surround the whole or part of the punched outer shape of the metal component in an arc shape. is there. In this case, any directional bending that occurs in the scrap portion around the punched outer shape can be suppressed.

Further, it is preferable that the reinforcing portion has a projecting shape projecting from the periphery thereof (claim 6). As the protruding shape, various shapes such as a U-shaped cross section can be adopted. Further, the above-mentioned protruding shape can be easily formed by press forming, and at the same time, the so-called section modulus can be sufficiently improved, and it is suitable as the above-mentioned reinforcing portion.

Further, the reinforcing portion may have a stepped shape in which the heights of the one side and the other side are stepped with respect to the reinforcing portion as a boundary (claim 7). The stepped shape can be obtained, for example, as shown in FIG. 9 described later, by providing a plane to which the punched outer shape of the metal component belongs and a plane to which the punched outer shape does not belong in different steps. In this case as well, it is possible to improve the section modulus as in the case of the protruding shape.

Further, when the stepped shape is provided, it is preferable that the plane to which the punched outer shape belongs is formed to be higher than the plane around it. In this case, even when the flat surface to which the punching external shape belongs is bent, the flexure is located at a position sufficiently higher than the lower metal sheet metal component sampling port, and thus the risk of the flexure being caught in the thin metal sheet component sampling port. The sex can be further reduced.

Further, the shape of the reinforcing portion may be a combination of the right-angled portion, the parallel portion, the inclined portion, the round portion, the protruding shape, and the stepped shape. In this case, the bending suppression effect can be further improved.

Next, in the second aspect of the present invention (claim 8), the claw portion is formed by forming a notch in the base plate so as to correspond to a front end position and a rear end position of the claw portion, and thereafter. It is preferable that the portion located between the notches is bent at a substantially right angle (claim 9). In this case, the claw portion can be easily formed by bending only the portion sandwiched by the notches. Further, the position of the claw portion can be set so as to reduce the decrease in material yield.

Further, it is preferable that the base plate is a thin electromagnetic steel plate, and the thin metal part is a sheet base material for a motor core. A large number of the above-mentioned motor core sheet base materials are laminated and used as a rotor core or a stator core. Since a large number of the above-mentioned motor core sheet base materials are required, it is effective to manufacture them from the original plate made of the above thin metal plate by the progressive press working method. At this time, by adopting the above-described excellent punching method, it is possible to further smoothly manufacture the motor core sheet base material.

The thin metal part has a thickness of 0.35 m.
It is preferably m or less and the outer diameter is 200 mm or more (claim 11). When the thickness is 0.35 mm or less and the outer diameter is 200 mm or more, the scrap portion is particularly likely to bend. Even in this case, the bending of the scrap portion can be sufficiently suppressed as described above.

[0022]

Embodiments First, Embodiment 1 to Embodiment 7 will describe a punching method for a thin sheet metal part according to an embodiment of the first invention. (Embodiment 1) As shown in FIGS. 1 to 3, a punching method of a thin metal part of this example is such that a plurality of thin metal parts 11 and 12 are sequentially arranged in a longitudinal direction from a base plate 1 made of a long thin metal plate. This is a punching method for punching and sampling. At the same time as or before the punching, the reinforcing portion 2 for increasing the rigidity of the scrap portion is formed by press molding with respect to the scrap portion remaining on the base plate side at the time of punching the thin plate metal parts 11 and 12. To do.

Hereinafter, this example will be described in detail. In this example, as shown in FIGS. 1 to 3, the width is 340 mm and the thickness is 0.
Two types of sheet materials for motor cores were produced from the original plate 1 of a 35 mm thin metal plate as a thin metal part by a progressive press working method. The motor core sheet base materials produced in this example are the rotor core sheet 11 and the stator core sheet 12 shown in FIGS. 2 (a) and 2 (b), respectively. As shown in FIG. 3A, the rotor core sheet 11 has a hollow portion 11 at the center.
The first protrusion 111 and the second protrusion 112, which have a ring shape with 0s and are alternately provided on the outer peripheral portion, and the second protrusion
It has an opening 113 provided in the convex portion 112. Also,
As shown in FIG. 2B, the stator core sheet 12 is
It has a ring shape with a rotor core insertion portion 120 provided in the center, a slot portion 121 on the inner peripheral portion, and a screw hole portion 122 on the outer peripheral portion. The outer diameter of the rotor core sheet 11 is smaller than the inner diameter of the stator core sheet 12.

In this example, six pressing steps P1 to P6 were performed as shown in FIG. 1 in order to collect the above two types of motor core sheet base materials. Specifically, first, as shown in FIG. 1, in the first pressing step P1, the reinforcing portion 2 having the right-angled portion 21 and the inclined portion 22 is formed on the base plate 1 of the thin metal plate by press molding. In addition, the reinforcing portion 2 formed in this example has a protruding shape protruding more than its surroundings, specifically, a protruding shape having a U-shaped cross section.

Next, in the second pressing step P2, the hollow portion 110 of the rotor core sheet 11 is formed on the base plate 1 of the thin metal plate.
And the opening 113 was formed. Then, in the third pressing step P3, the slot portion 1 of the stator core sheet 12 is
21 precursors 123 and screw holes 122 were formed. Next, in the fourth pressing step P4, the rotor core sheet 11 is formed so as to form the first protrusions 111 and the second protrusions 112.
Then, as shown in FIG. 3, the rotor core sheet 11 was sampled from the thin plate metal part sampling port 65 of the lower mold 6.

Next, as shown in FIG. 1, in the fifth pressing step P5, the immediate inside of the precursor mold 123 was punched into a circular shape to form the rotor core insertion portion 120 and the slot portion 121. Further, in the sixth pressing step P6, the stator core sheet 12 was punched out, and the stator core sheet 12 was sampled from the thin metal part sampling port 65 of the lower die 6 as shown in FIG. Hereinafter, the rotor core sheet 11 and the stator core sheet 12 shown in FIG. 2 were manufactured one after another by repeating the pressing steps P1 to P6.

Conventionally, unlike the present example, the first pressing step P1 for forming the reinforcing portion is not carried out. Therefore, conventionally, in the scrap portion 15 after punching the stator core sheet 12 in the final pressing step, the bending of the narrow boundary portion 151 becomes particularly large. Therefore, when the final press step is completed and the sheet is sequentially fed, the bending is caught in the thin plate metal component sampling port 65 of the lower die 6 or the original plate 1 is disengaged from the guide lifter 4, and the original plate 1 is sequentially fed. There was a danger that could not be done.

On the other hand, in this example, the scrap portion 1
5 has a reinforcing portion 2 for increasing rigidity. Due to the existence of the reinforcing portion 2, the cross-section coefficient of the scrap portion 15 is improved, and the resistance against bending due to its own weight is significantly improved as compared with the conventional case. Further, the reinforcing portion 2 of this example has a right angle portion 21.
And an inclined portion 22. Therefore, the reinforcing portion 2 of the present example can suppress the bending that occurs in the longitudinal direction and the width direction of the base plate 1. Therefore, in this example, even in the very narrow scrap portion 15 after punching the stator core sheet 12, almost no bending occurred. In this example, as described above, since the trouble due to the bending of the scrap portion 15 can be prevented, continuous punching of the motor core sheet base material can be smoothly performed, and the motor core sheet base material can be produced. It was possible to improve the property.

(Example 2) In this example, as in Example 1, six pressing steps P21 to P26 were performed as shown in FIG. 4 in order to collect the motor core sheet base material shown in FIG. In this example, the first pressing step P1 in Example 1 was used.
The step of forming the reinforcing portion 2 performed in step 3 was performed immediately before punching out the rotor core sheet 11. Specifically, as shown in FIG. 4, in the first pressing step P21, the hollow portion 110 and the opening 113 of the rotor core sheet 11 were formed in the base plate 1 of the thin metal plate. Then, in the second pressing step P22, the precursor 123 and the screw hole 122 of the slot 121 of the stator core sheet 12 were formed.

Next, in the third pressing step P23,
As in Example 1, the reinforcing portion 2 having the right angle portion 21 and the inclined portion 22 was formed. In the following pressing steps P24 to P26, the rotor core sheet 11 and the stator core sheet 12 were punched and sampled in the same manner as in Example 1.

As described above, in this example, the reinforcing portion 2 was formed immediately before punching the rotor core sheet 11. In this case, as in the case of Example 1, smooth punching of the motor-core sheet base material could be performed without causing troubles due to bending of the scrap portion 15. For this reason, after punching the rotor core sheet 11 and the stator core sheet 12 from the base plate, the area of the base plate becomes very small, so that the reinforcing portion 2 is necessary, but at the time of the second pressing step 22, it is still unclear. It can be seen that the area of the base plate 1 is sufficiently wide and has rigidity that can prevent the flexure, and it is not always necessary to provide the reinforcing portion 2. Needless to say, when the reinforcing portion 2 is first provided as in the first embodiment, the rigidity of the scrap portion in all subsequent pressing steps can be improved.

(Embodiment 3) In this embodiment, the motor core sheet base material shown in FIG. 2 is manufactured in the same manner as in Embodiment 1 except that only the shape of the reinforcing portion 2 is changed. Indicates. As shown in FIG. 5, the first modification of the reinforcing portion 2 is an example having only a right angle portion 21 formed along a direction substantially perpendicular to the longitudinal direction of the base plate 1.
A second modification of the reinforcing portion 2 has an example in which the right-angled portion 21 and a parallel portion 23 formed along a direction substantially parallel to the longitudinal direction of the base plate 1 are provided as shown in FIG. Is. The third modification of the reinforcing portion 2 is an example having a round portion 24 that surrounds a part of the punched outer shape of the right-angled portion motor core sheet base material in an arc shape as shown in FIG. 7.

In this embodiment, whichever shape the reinforcing portion 2 is formed in, as in the first embodiment, the smooth punching of the motor core sheet base material does not cause any trouble due to the bending of the scrap portion 15. I was able to do it.

(Embodiment 4) Also in this embodiment, an example in which the motor core sheet base material shown in FIG. 2 is manufactured in the same manner as in Embodiment 1 except that only the shape of the reinforcing portion 2 is changed. Show. Specifically, the reinforcing portion 2 in this example is shown in FIG.
As shown in (a), it has a rounded portion 24 that encloses the entire punched outer shape of the motor core sheet base material in an arc shape, and as shown in (b) of the same figure, a protruding shape with a U-shaped cross section protruding from the surroundings. It is an example having 25. Also in this case, as in the first embodiment, the punching of the motor core sheet base material could be performed smoothly without causing any trouble due to the bending of the scrap portion.

In particular, since the reinforcing portion 2 in this example has a round portion that surrounds the entire punched outer shape of the motor core sheet base material in an arc shape, it suppresses bending in any direction around the punched outer shape. sell. Therefore, after forming the reinforcing portion 2, almost no bending occurred around the punched outer shape. Therefore, the effect of suppressing the deflection could be obtained more stably.

(Embodiment 5) Also in this embodiment, an example in which the motor core sheet base material shown in FIG. 2 is manufactured in the same manner as in Embodiment 1 except that only the shape of the reinforcing portion 2 is changed. Show. Specifically, as shown in FIG. 9 (a), the reinforcing portion 2 of this example has a round portion 24 that surrounds the entire punched outer shape of the motor core sheet base material in an arc shape, and further, the reinforcing portion is a boundary. Is an example in which a step shape 26 is formed to make the height of one side different from that of the other side.

In this example, since the stepped shape 26 has the effect of improving the section modulus of the scrap portion 15, in this case also, as in the case of the first embodiment, there is no trouble caused by bending of the scrap portion, and smooth It was possible to punch various sheet materials for motor cores.

Next, a punching method for a thin sheet metal part according to the second embodiment of the present invention will be described in the sixth and seventh embodiments. (Embodiment 6) As shown in FIGS. 10 to 12, a punching method for thin metal parts of this example is such that a plurality of thin metal parts 11 and 12 are sequentially arranged in a longitudinal direction from a base plate 1 made of a long thin metal plate. This is a punching method for punching and sampling. Of the scrap portion 15 remaining on the original plate side when punching the thin plate metal parts 11 and 12, both side end portions 152 of the boundary portion 151 located between the front and rear punching positions adjacent to each other in the longitudinal direction are provided with the original elements. A pair of claw portions 3 formed by bending a part of the plate at a substantially right angle is formed in advance. Then, after punching the thin metal parts 11 and 12, the scrap part 15
When advancing, the tension is applied so that the pair of claw portions 3 are pulled outward from each other, and the forward movement is performed while suppressing the bending of the boundary portion 151.

Hereinafter, this example will be described in detail. In this example, first, as shown in FIG. 10, the width is 6 mm wider than the base plate used in Examples 1 to 7, the width is 346 mm, and the thickness is 0.35 m.
A base plate 1 of a thin metal plate of m was prepared, and two kinds of sheet base materials for motor cores were manufactured from the base plate 1 as thin metal parts 11 and 12 by a progressive press working method. The motor core sheet base material produced in this example is the same as in Examples 1 to 5, and is the rotor core sheet 11 and the stator core sheet 12 shown in FIG.

In this example, six pressing steps P31 to P36 were performed as shown in FIG. 10 in order to prepare the above two types of motor core sheet base materials. Specifically, FIG.
In the first pressing step P31, as shown in FIG. 5, the hollow part 110 and the opening 113 of the rotor core sheet 11 are formed in the base plate 1 of the thin metal plate, and at the same time, a pair of notches 153 are formed in both edges of the base plate 1. . Notch 15 in this example
As shown in FIG. 10, the vertical lines 3 drawn from the center of the punching position 11 of the thin metal parts to both edges of the base plate 1 are the base plates 1.
It was formed at the position where it intersects with both edges. Next, in the second pressing step P32, the precursor type 123 of the slot portion 121 of the stator core sheet 12 and the screw hole portion 122 were formed.

Next, in the third pressing step P33, the portions which are both edges of the base plate 1 and which are sandwiched by the two adjacent notches 153 are bent at a substantially right angle, and the pair of claw portions 3 are formed.
Was formed. In this example, the claw portions 3 are formed on substantially the entire edges of the base plate 1 as shown in FIG. And
In the fourth to sixth pressing steps P34 to P36 after the pressing step P33 is completed, basically the same pressing as that in the above-described first embodiment is performed, but in all cases, the base plate 1 with the claw portion 3 is used. The points handled are very different. Therefore, in this example,
The guide lifter 4 having the following special structure was provided for the lower mold 6 in all the subsequent steps.

The guide lifter 4 is shown in FIGS.
As shown in FIG. 5, the block 41 has a substantially U-shaped cross section, a groove portion 42 formed in the block 41, and a top plate portion 49 covering the groove portion 42. Base plate 1 of the block 41
The height of the near wall portion 46 is lower than that of the other wall portion 45, and a space 460 is provided between the wall portion 46 and the top plate 49. By this,
The block 41 and the top plate portion 49 form a void having a substantially L-shaped cross section. Then, on the inner surface of the wall portion 46 on the base plate side of the block 41, a taper portion 46 which is inclined from the insertion opening 43 in the traveling direction of the base plate so as to reduce the width of the groove 42.
1 and a linear portion 462 connected from the tapered portion 461 in the traveling direction of the base plate.

Further, as shown in FIG. 12B, the guide lifter 4 is arranged so as to be able to move up and down with respect to the lower die 6 via a pin 48. When the guide lifter 4 is lowered, the upper surface portion 465 of the wall portion 46 is at the same height as the upper surface portion 60 of the lower die 6, while the guide lifter 4 is moved up and down (FIG. 12 (a)). (State), the upper surface portion 465 of the wall portion 46 is configured to rise to a position sufficiently higher than the upper surface of the lower mold 6.

In all of the pressing steps P34 to P36, the guide lifter 4 is used to guide the progress of the base plate 1. That is, when the pawl portion 3 passes through the guide lifter 4, the guide lifter 4 is raised, and as shown by the arrow 9 in FIG. Move forward along. At this time, since the tapered portion 461 is inclined, the claw portion 3 is pulled outward in the width direction as it advances.
That is, when the base plate 1 is moved forward, the claw portion 3 is pulled in the direction of the arrow 91 as shown in FIG.
Tension is applied to the base plate 1 connected to the claw portion 3.

Therefore, the fourth to sixth pressing steps P34
In P36 to P36, due to the above-mentioned tension when the base plate 1 is fed, the scrap portion 15 having a narrow width hardly bends. Therefore, in all of the fourth to sixth pressing steps P34 to P36, smooth pressing work can be performed without causing any trouble,
The rotor core sheet 11 and the stator core sheet 12 could be manufactured one after another.

Further, in this example, as shown in FIG. 10, the claw portions 3 are formed over substantially the entire edges of the base plate 1. Therefore, after the press step P33 in which the claw portion 3 is formed, the tension is almost continuously applied to the base plate 1. Therefore, in this example, almost all the bending that can occur in the base plate 1 can be suppressed.

(Embodiment 7) In this embodiment, only the position for forming the claws in Embodiment 6 and the width of the base plate made of a thin metal plate are changed, and the same procedure as in Embodiment 6 is carried out. A material was produced. First, the same width as in Examples 1 to 5 340 m
A base plate 1 of a thin metal plate having a thickness of m and a thickness of 0.35 mm was prepared. The base plate 1 is 6 mm narrower than that used in Example 6. Two types of sheet base materials for motor cores shown in FIG. 2 were produced from the base plate 1 as thin metal parts by a progressive press working method.

In this example, six pressing steps P41 to P46 were performed as shown in FIG. Specifically, first
In the pressing step P41 of 1., the hollow portion 110 and the opening 113 of the rotor core sheet 11 are formed in the base plate 1 of the thin metal plate, and at the same time, two pairs of notches 153, that is, four cutouts 153 are formed on both edges of the base plate 1. The notch 153 was formed. As shown in FIG. 13, the notch 153 in this example is formed on both side end portions 15 of the boundary portion 151 located between the punching positions 10.
Formed to 2.

Next, in the second pressing step P42, the portions sandwiched by the two notches 153 adjacent to each other on both edges of the base plate 1 are bent at a substantially right angle, and the pair of claw portions 3 are formed.
Was formed. In this example, the claw portions 3 are formed on both side end portions 152 of the boundary portion 151. Next, in a third pressing step P43, the precursor type 123 of the slot portion 121 of the stator core sheet 12 and the screw hole portion 122 were formed on the base plate 1 of the thin metal plate. Hereinafter, the press process P44 to P
In 46, the guide lifter 4 is used as in the sixth embodiment.
The base plate 1 is sequentially fed in a state where tension is applied to the base plate 1, and the rotor core sheet 11 and the stator core sheet 1
2 was produced.

Also in this example, as in the case of Example 6, the scrap portion 15 is produced when the above-mentioned motor core sheet base material is produced.
The above-mentioned sheet base material for motor cores could be smoothly produced without any bending. Further, in this example, the claw portions 3 are formed only on both side end portions 152 of the boundary portion 151. Therefore, the claw portion 1 as in the sixth embodiment
Since it is not necessary to previously set the width of the base plate 1 to be long in order to form 53, it is possible to reduce a decrease in material yield.

[Brief description of drawings]

FIG. 1 is an explanatory diagram related to a method of manufacturing a motor core sheet base material according to a first embodiment.

FIG. 2 is a plan view (a) of a rotor core sheet and a plan view (b) of a stator core sheet according to Examples 1 to 8;

FIG. 3 is an explanatory diagram of a progressive press working method according to the first embodiment.

FIG. 4 is an explanatory diagram related to a method of manufacturing a motor core sheet base material according to the second embodiment.

FIG. 5 is an explanatory diagram of a first modification of the reinforcing portion according to the third embodiment.

FIG. 6 is an explanatory diagram of a second modification of the reinforcing portion according to the third embodiment.

FIG. 7 is an explanatory diagram of a third modification of the reinforcing portion according to the third embodiment.

8A and 8B are an explanatory view (a) and a sectional view taken along the line AA (A) of the reinforcing portion according to the fourth embodiment.

9A and 9B are an explanatory view (a) and a sectional view taken along the line BB (b) of the reinforcing portion according to the fifth embodiment.

FIG. 10 is an explanatory diagram related to a method of manufacturing the motor core sheet base material according to the sixth embodiment.

FIG. 11 is an explanatory diagram of a progressive press working method according to a sixth embodiment.

FIG. 12A is an explanatory view of a guide lifter according to the sixth embodiment and FIG. 12B is a cross-sectional explanatory view of the guide lifter.

FIG. 13 is an explanatory diagram related to a method of manufacturing the motor core sheet base material according to the seventh embodiment.

FIG. 14 is an explanatory view of a progressive press working method according to a conventional example.

[Explanation of symbols]

1. ． ． Base plate, 10. ． ． Punching position, 11. ． ． Thin metal parts (rotor core sheet) 12. ． ． Thin metal parts (stator core sheet) 15. ． ． Scrap part, 151. ． ． Border area, 152. ． ． Both ends, 153. ． ． Cutout, 2. ． ． Reinforcement part, 3. ． ． Claw, 4. ． ． Guide lifter, 46. ． ． Taper part,

Claims (11)

[Claims] 1. A punching method for sequentially punching and sampling a plurality of thin metal parts in a longitudinal direction from a base plate made of a long thin metal plate, wherein a scrap portion remaining on the base plate side when punching the thin metal parts is used. On the other hand, a punching method for a thin sheet metal part, which comprises forming a reinforcing portion for enhancing the rigidity of the scrap portion at the same time as or before the punching. 2. The punching method for a thin sheet metal component according to claim 1, wherein the reinforcing portion has a right-angled portion formed along a direction substantially perpendicular to a longitudinal direction of the base plate. . 3. The thin plate metal component according to claim 1, wherein the reinforcing portion has a parallel portion formed along a direction substantially parallel to a longitudinal direction of the base plate. Punching method. 4. The method according to claim 1, wherein
The punching method for a thin metal part, wherein the reinforcing part has an inclined part formed obliquely with respect to a longitudinal direction of the base plate. 5. The method according to any one of claims 1 to 4,
The punching method for a thin sheet metal component, wherein the reinforcing portion has a round portion surrounding the whole or a part of the punching contour of the thin sheet metal component in an arc shape. 6. The method according to any one of claims 1 to 5,
The punching method for a thin sheet metal component, wherein the reinforcing portion has a protruding shape protruding more than its surroundings. 7. The method according to any one of claims 1 to 5,
The punching method for a thin sheet metal component, wherein the reinforcing portion has a stepped shape in which the heights of one side and the other side are stepped with respect to the reinforcing portion as a boundary. 8. A punching method for sequentially punching and sampling a plurality of thin metal parts from a base plate made of a long thin metal plate in a longitudinal direction, wherein a scrap portion remaining on the side of the base plate when punching the thin metal parts is used. A pair of claw portions formed by bending a part of the base plate at a substantially right angle are preliminarily formed at both end portions of the boundary portion located between the front and rear punching positions adjacent to each other in the longitudinal direction, and the thin plate is formed. When advancing the scrap portion after punching out the metal part, a thin plate is characterized in that tension is applied so as to separate the pair of claw portions outwardly from each other to suppress the bending of the boundary portion and advance the thin plate. How to punch metal parts. 9. The formation of the claw portion according to claim 8,
A thin metal sheet, characterized in that notches are formed in the base plate so as to correspond to the front end position and the rear end position of the claw portion, and then the portion located between the notches is bent at a substantially right angle. How to punch parts. 10. The punching method for a thin metal part according to claim 1, wherein the base plate is a thin electromagnetic steel plate, and the thin metal part is a motor core sheet base material. . 11. The stamped sheet metal component according to claim 1, wherein the sheet metal component has a thickness of 0.35 mm or less and an outer diameter of 200 mm or more. Method.