JP5493494B2 - Hole punching method - Google Patents

Description

  The present invention relates to a punching method for making a hole in a metal flat plate in press working of the metal flat plate.

Conventionally, there is known a punching method in which a punch as a male die is inserted into a die hole of a die as a female die that supports one surface of a metal flat plate, and a hole having a shape along the opening of the die hole is opened in the metal flat plate. ing.
In this punching method, when the punch is inserted into the die hole, the portion punched out of the metal flat plate is separated from the metal flat plate to become a scrap and inserted into the die hole together with the punch. When it is lifted and pulled out from the die hole, there has been a problem that the punched waste also pops out from the die hole together (hereinafter, this phenomenon is referred to as scrap rise). When such a residue rises, the removal residue causes a problem such as damage to the metal flat plate during the next processing.

  Conventionally, as a technique for suppressing such residue rise, a method of providing a kicker pin on a punch, a technique of providing a suction device at the lower part of a die and suctioning and removing the residue (for example, refer to Patent Document 1), a surface of a die hole inner wall A technique for roughening the roughness (for example, see Patent Document 2), a technique for providing a spiral groove in the inner wall of the die hole (for example, see Patent Document 3), a technique for providing irregularities in the inner wall of the die hole (for example, see Patent Document 4) ), And a technique (for example, see Patent Document 5) in which a punched piece is subjected to a half punching process before the punching process and the punched pieces are fitted during the punching process.

However, as in the techniques described in Patent Documents 1 to 4 and the like, providing a suction device or setting a punch or die leads to an increase in mold production costs, and the hole size to be processed There may be restrictions on use depending on
Further, in the technique described in Patent Document 5, there is a case where the extracted wastes do not fit properly, and there is a possibility that the residue rises.

  The present invention has been made paying attention to the above-mentioned conventional problems, and an object of the present invention is to provide a hole punching method that can reliably prevent dregs rise at a low cost in the hole punching of a metal flat plate.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention includes a clamping step of clamping the periphery of a punched portion of a metal flat plate with a die and a stripper plate, and a punch provided on the stripper plate side. The punched part is inserted into a die hole formed in the die to punch out the hole, and a hole is opened in the metal flat plate. The punched part is separated from the metal flat plate as a punched residue and extruded into the die hole. A punching process, and before the clamping step, in the peripheral portion of the punched portion of the metal flat plate, either the clamping step or the punching step of the metal flat plate A protrusion forming step for forming a protruding portion curved in the shearing direction at a site pressed in the shearing direction is provided, and at the time of performing either the clamping step or the punching step In a state where the object to be punched portion is weighted in a direction perpendicular the substantially by presses the serial projections to deform in a direction substantially perpendicular to the shear direction, the carrying out punching by the punch of the stamping process, the In the protrusion forming step, the protrusion is provided outside the punched portion and in a portion sandwiched between the die and the stripper plate, and the outer periphery of the punched portion of the metal flat plate is performed during the sandwiching step. The punching method is characterized in that the projection is pressed when sandwiched between the die and the stripper plate .

Further, in the invention according to claim 2, in piercing method of claim 1, wherein the protrusions piercing, characterized in that said provided plurality along the periphery of the punching unit It was a method.

Further, in the invention according to claim 3, in piercing method of claim 2, wherein the protrusions and the piercing process, wherein the provided plurality symmetrically to be punched portion did.

According to a fourth aspect of the present invention, in the hole punching method according to any one of the first to third aspects, the protrusion is formed in a dot shape. The punching method was used.

According to a fifth aspect of the present invention, in the hole punching method according to any one of the first to third aspects, the protruding portion has an elongated bead shape extending in a direction along the outer periphery of the hole. It was set as the punching method characterized by being formed in this.

  In the first aspect of the present invention, at the time before the punched portion of the metal flat plate is punched with a punch in the punching step, the protrusion is pressed in the shearing direction and deformed in a direction substantially perpendicular to the shearing direction. The punched portion is in a state of being weighted in a direction substantially orthogonal to the shearing direction. In this state, when the punched portion is punched with a punch, the punched pieces separated from the metal flat plate are removed from the load substantially perpendicular to the shearing direction that has been applied so far, and extend in the substantially perpendicular direction to the shearing direction. As a result, the outer peripheral dimension of the punched residue is enlarged and the outer peripheral edge is pressed against the inner wall of the die hole, so that the punched residue stays in the die hole and can prevent the residue from rising.

  As described above, in the present invention, the protrusion is pressed and deformed in a direction substantially orthogonal to the shearing direction, and is pressed against the die hole by extension deformation when the punched residue is separated from the metal flat plate to prevent the residue from rising. For this reason, it is possible to reliably prevent the residue from rising, as compared with the case in which unevenness is formed on the extraction residue and fitted.

  In addition, according to the present invention, it is possible to prevent the residue from rising only by forming a protrusion on the metal flat plate, so that the residue can be prevented from rising more inexpensively than when a suction device is provided or a punch or die is provided. it can.

Moreover, as the outer periphery of the punched portion of the metal flat plate is sandwiched between the die and the stopper plate by the clamping process, the projection is pressed in the shearing direction by the die and the stopper plate, and the projection is moved in a direction substantially orthogonal to the shearing direction. Deform. And with this deformation | transformation of a projection part, a to-be-punched part is weighted toward inner side from the outer peripheral side. Note that the punched portion may be bent and deformed in the shearing direction by this load.

In this state, a punching process is performed, the punched part is punched by a punch, and the punched part is separated from the metal flat plate. And remains in the die hole.
In addition, since a protrusion remains around the hole, the rigidity of the hole can be increased as compared with a case where no protrusion is provided.

In the second aspect of the present invention, since the plurality of protrusions are provided along the periphery of the punched portion, the punching step after the punching process is stretched in the outer peripheral direction at a plurality of locations, and the stretching is performed at one location. Compared with what is produced, there are many places where the die hole is in contact with the inner wall, and the anti-slip performance can be enhanced.

In the third aspect of the present invention, since the plurality of protrusions are provided symmetrically on the periphery of the punched portion, the punching step after the punching process is performed in the outer circumferential direction symmetrically, and the stretching is performed asymmetrically. As compared with the above, the outer dimension passing through the center of the punched portion can be reliably increased, the pressure contact force to the inner wall of the die hole can be increased, and the dregs rise prevention performance can be improved.

In the invention according to the fourth aspect , since the protrusions are formed in the shape of dots, it is easy to process in the protrusion forming step, and it is easy to provide a large number. When many are provided, the number of deformed portions in the outer peripheral direction of the punched residue generated in the punching process is increased, the pressure contact force to the inner wall of the die hole can be increased, and the residue prevention performance can be improved.

In the fifth aspect of the present invention, since the protruding portion is formed in a bead shape elongated in the direction along the outer periphery of the hole, when the punched residue is extended in the punching process, the protrusion extends with a width in the direction along the outer periphery. Therefore, the deformation range in the outer peripheral direction can be widened, the pressure contact range to the inner wall of the die hole can be widened, and the residue rise prevention performance can be enhanced.

FIG. 6 is a cross-sectional view illustrating a protrusion forming process in the hole punching method according to the first embodiment. It is sectional drawing which shows the principal part of the press apparatus which implements the hole punching method of Example 1, and the metal flat plate 1, Comprising: The press process (clamping process) is shown. It is sectional drawing which shows the principal part of the press apparatus which implements the punching method of Example 1, and the metal flat plate 1, Comprising: It has shown just before implementation of the punching process. It is sectional drawing which shows the principal part of the press apparatus which implements the punching method of Example 1, and the metal flat plate 1, Comprising: It has shown just after implementation of the punching process. It is a perspective view which shows the metal flat plate 1 which implements the punching method of Example 1, Comprising: The state which implemented the protrusion formation process and provided the protrusion part 1a is shown. It is a perspective view which shows the metal flat plate 1 which implements the punching method of Example 2, Comprising: The protrusion formation process is implemented and the state which provided the bead 21a is shown. It is a perspective view which shows the metal flat plate 1 which enforces the punching method of Example 3, Comprising: The state which implemented the protrusion formation process and provided the protrusion part 31a is shown. It is sectional drawing which shows the principal part of the press apparatus which implements the punching method of Example 3, and the metal flat plate 1, Comprising: The press process (clamping process) is shown. It is sectional drawing which shows the principal part of the press apparatus which implements the hole punching method of Example 3, and the metal flat plate 1, Comprising: It has shown just before implementation of the punching process. It is sectional drawing which shows the principal part of the press apparatus which implements the punching method of Example 4, and the metal flat plate 1, Comprising: It has shown just after implementation of the punching process. It is a perspective view which shows the metal flat plate 1 which implements the hole punching method of Example 4, Comprising: The protrusion formation process is implemented and the state which provided the bead 41a is shown. It is a perspective view which shows the metal flat plate 1 which implements the other Example of this invention, Comprising: The state which implemented the protrusion formation process and provided the protrusion part 101a is shown. It is a perspective view which shows the metal flat plate 1 which implements the other Example of this invention, Comprising: The protrusion formation process is implemented and the state which provided the bead 201a is shown. It is a perspective view which shows the metal flat plate 1 which implements the other Example of this invention, Comprising: The protrusion formation process is implemented and the state which provided the bead 301a is shown.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The punching method according to the embodiment of the present invention includes a clamping step of clamping the periphery of a punched portion (1c) of a metal flat plate (1) between a die (2) and a stripper plate (3), and the stripper plate ( 3) A punch (5) provided on the side is inserted into a die hole (2a) formed in the die (2) to punch out the punched portion (1c), and a hole (1b) is formed in the metal flat plate (1). ), And a punching step of separating the punched portion (1c) as a punched residue (1d) from the metal flat plate (1) and pushing it into the die hole (2a). And before the said clamping process, in the peripheral part of the to-be-punched part (1c) of the said metal flat plate (1), the shear direction of the said metal flat plate (1) in either the said clamping process or the said punching process In the part pressed by A projection forming step for forming a projection portion (1a) curved in the cutting direction, and pressing the projection portion (1a) during either of the clamping step and the punching step so as to be substantially orthogonal to the shear direction It is a punching method characterized in that punching is performed by the punch (5) in the punching step in a state where the punched portion (1c) is weighted in the substantially orthogonal direction by being deformed in a direction. .

  Below, the punching method of Example 1 which is one Embodiment of this invention is demonstrated based on FIGS.

  The punching method according to the first embodiment is a processing method in which the metal flat plate 1 shown in FIG. 1 is pressed and a hole 1b (see FIG. 4) is formed in a predetermined portion. The steps are described below in order. explain.

(Projection formation process)
In the first embodiment, a protrusion forming step for forming the protrusion 1a on the metal flat plate 1 is performed before the press working.

  In this projection forming step, as shown in FIG. 1, a part of the metal flat plate 1 is formed by embossing the metal flat plate 1 with a lower mold 11 having a convex portion 11a and an upper mold 12 having a concave portion 12a. The protrusion 1a shown in FIG. 2 is formed by bending in the shearing direction, and the recess 1e is formed on the back side of the protrusion 1a. In addition, this protrusion part 1a is dot-shaped, and the shape seen from upper direction is formed in circular shape.

  In the first embodiment, the protruding portion 1a is formed along the outer periphery of a portion that opens the hole 1b (hereinafter, this portion is referred to as a punched portion 1c). That is, the hole 1b is opened in a circular shape as indicated by a dotted line in FIG. Therefore, along the outer periphery of the punched portion 1c and the portion sandwiched between the die 2 and the stripper plate 3 at the time of press processing described later, the protruding portions 1a are arranged at substantially equal intervals on the same circumference. A plurality (eight in the first embodiment) are formed symmetrically about the hole 1b.

  The die 2 and the stripper plate 3 are a female die and a male die for opening the hole 1b, and the die 2 has a die hole 2a having a cross-sectional shape that matches the shape of the hole 1b. On the other hand, the stripper plate 3 is formed so that its outer peripheral shape follows the die hole 2a.

(Pressing process (clamping process))
Next, the metal flat plate 1 is pressed using a mold (not shown).
The mold includes a lower mold and an upper mold (not shown), the metal flat plate 1 is placed on the lower mold, the upper mold is matched with the lower mold from above, and the metal flat plate 1 is pressed.

When this press working is performed, the periphery of the punched portion 1c of the metal flat plate 1 is sandwiched (a sandwiching step).
That is, the outer peripheral portion of the punched portion 1c in the metal flat plate 1 moves in the downward direction indicated by the arrow P1 together with the upper die when the stripper plate 3 provided integrally with the upper die not shown in FIG. It is sandwiched between the die 2 provided integrally with a lower mold (not shown) and the stripper plate 3.

  At the time of clamping, the protruding portion 1a is pressed and crushed by the die 2 and the stripper plate 3 in a shearing direction and deformed in a direction substantially perpendicular to the shearing direction indicated by an arrow P2 in the figure, and the punched portion 1c is sheared. It is substantially orthogonal to the direction, is loaded from the outer peripheral side to the inner side, is compressed in the substantially orthogonal direction, and a part thereof is deformed in the shearing direction which is the vertical direction in the figure although not shown.

(Punching process)
Next, a punching operation is performed in which the punch 5 provided in the upper die (not shown) is moved downward as indicated by an arrow P3 until it is inserted into the die hole 2a formed in the die 2, so that the punched portion of the metal flat plate 1 is punched. 1c is punched and separated from the metal flat plate 1, and a hole 1b shown in FIG. 4 is opened.

  Thereby, the to-be-punched part 1c becomes the punching waste 1d separated from the metal flat plate 1 and enters the inside of the die hole 2a. At this time, at the time of the punched portion 1c before being separated from the metal flat plate 1, the punched residue 1d is compressed in a direction substantially perpendicular to the shearing direction and from the outer periphery toward the inside. Since it may also be deformed in the shearing direction, when it is separated from the metal flat plate 1, it extends in the outer peripheral direction, and the outer periphery is pressed by pressing the inner wall of the die hole 2a in the outer peripheral direction as indicated by an arrow P4. .

  With this pressure contact force, the punched residue 1d stays in the die hole 2a when the punch 5 returns upward in the direction of the arrow P5, thereby preventing the residue from rising.

(Effect of Example 1)
As described above, in the hole punching method according to the first embodiment, the effects listed below can be obtained.

  a) Since the punched residue 1d extends in the die hole 2a and remains in pressure contact with the inner wall to prevent the residue from rising, the punched residue 1d can be prevented from damaging the surface of the metal flat plate 1 when the press die is opened. . Further, since the punched residue 1d is retained in the die hole 2a by utilizing its elastic deformation, the die hole is surely compared with the conventional method in which the punched residue 1d is deformed and the punched residues 1d are fitted to each other. 2a.

  b) Since the above-mentioned prevention of scraping of a) is performed only by forming the protrusion 1a around the portion where the hole 1b of the metal flat plate 1 is formed, an apparatus is added to the mold, punch or die, or processing is performed. Compared to the application, it is possible to reduce the cost of mold production, and it is possible to secure a degree of freedom in design by suppressing restrictions on the hole size to be processed.

  c) Since the protrusion 1a is formed only by embossing a circular dot on the outer periphery of the punched portion 1c, it is easy to mold and can be implemented at low cost.

  d) Since the protruding portions 1a are arranged at eight positions on the same circumference over the entire circumference of the punched portion 1c at equal intervals, the deformation of the protruding portion 1a may occur when the clamping process is performed. Symmetrically occurs at a plurality of locations around the entire circumference of 1c. Therefore, when the punched dregs 1d are expanded during the punching process, the expansion occurs symmetrically over the entire circumference, so that the maximum outer dimension is larger than that in which the expansion occurs asymmetrically on the outer periphery of the punched dregs 1d. It becomes easy to stay on the inner wall of the die hole 2a, and a high dregs rise prevention performance can be obtained.

  e) Since the protruding portion 1a is provided outside the punched portion 1c, the metal plate 1 can reinforce the peripheral edge of the hole 1b with the unevenness caused by the protruding portion 1a remaining around the hole 1b.

(Other examples)
Other embodiments will be described below. Since these other embodiments are modifications of the first embodiment, only the differences will be described, and the configuration common to the first embodiment or the other embodiments will be described. The description is omitted by giving a common reference numeral.

  The second embodiment is a modification of the first embodiment, and the shape of the protrusion formed in the protrusion formation step is different from that of the first embodiment.

  That is, in the second embodiment, as shown in FIG. 6, the protruding portion is provided with a bead 21 a that is arcuate and long and convex upward along the outer periphery of the punched portion 1 c, and this bead 21 a has the same circumference. They are symmetrically arranged at intervals of 90 degrees in the upper four places.

  Even in the second embodiment, the projection forming process, the press working process (clamping process), and the punching process similar to those in the first embodiment are executed, and the effects a) to e) are obtained as in the first embodiment. .

  In addition, in Example 2, since the bead 21a is formed in an arcuate ridge shape elongated in the circumferential direction, when this portion is sandwiched between the die 2 and the stripper plate 3 in the pressing process, In the to-be-punched part 1c, the weight by a deformation | transformation arises in the range which has the width | variety in the circumferential direction. Therefore, when punching with the punch 5 is performed in the punching process, the punching residue 1d extends in a range having a width in the circumferential direction, and is thus pressed against the inner wall of the die hole 2a with a width. It is easy to stay in.

Next, the hole punching method of Example 3 will be described.
In the third embodiment, the positions of the protrusions 31a formed in the protrusion forming process are different from those in the first embodiment, and as a result, the operations of the pressing process (clamping process) and the punching process are different.

  That is, in Example 3, as shown in FIG. 7, the protrusion 31a is formed along the inner periphery of the position where the hole 1b is formed in the punched portion 1c, and the punch 5 is pressed. It is formed in a shape that protrudes upward from the upper surface in the figure which is the side surface.

  In Example 3, as shown in FIG. 8, in the pressing process, when the outer periphery of the punched portion 1 c of the metal flat plate 1 is sandwiched between the die 2 and the stripper plate 3, the protruding portion 31 a is not pressed.

  In the next punching step, when the punch 5 punches the metal flat plate 1, first, as shown in FIG. 9, the punch 5 presses the projection 31 a downward and is substantially orthogonal to the shearing direction indicated by the arrow P <b> 2. The punched portion 1c is bent and deformed in the shearing direction.

  After that, the punch 5 punches the punched portion 1c, and this portion is separated from the metal plate 1 as the punched residue 1d and enters the inside of the die hole 2a. When the weight is removed, the punched residue 1d is restored and removed. The peripheral edge extends outward as indicated by arrow P4 and is pressed against the inner wall of the die hole 2a.

  Therefore, when the punch 5 returns in the direction of the arrow P5 as shown in FIG. 10, the punched residue 1d stays in the die hole 2a, and the residue can be prevented from rising.

As described above, even in the third embodiment, the effects a) to d) can be obtained as in the first embodiment.
Furthermore, in Example 3, since the protruding portion 31a was formed in the punched portion 1c, the protruding portion 31a was separated from the metal flat plate 1 together with the punched residue 1d, and the protruding portion 31a did not remain on the metal flat plate 1.
Therefore, the surface quality of the metal flat plate 1 after the punching process can be improved.

  The fourth embodiment is a modification of the third embodiment, and is an example in which a bead 41a shown in FIG. 11 is provided as a protrusion. That is, the bead 41a is formed in a convex shape protruding along the inner periphery of the hole 1b in the direction of the arc-shaped punch 5 as in the second embodiment.

  Therefore, also in Example 4, as in Example 3, when the punch 5 punches the metal flat plate 1, the punched portion 1c is deformed in a direction perpendicular to the shearing direction to obtain a punched residue 1d. When separated from the metal flat plate 1, it is pressed against the inner wall of the die hole 2 a with a restoring force, and the residue can be prevented from rising.

  Moreover, in Example 4, since the bead 41a was formed in the shape of a long ridge in the circumferential direction, when the punch 5 pressed the bead 41a, deformation occurred in a range having a width in the circumferential direction, and the die hole 2a It is easy to engage with.

  As mentioned above, although the punching method of the present invention has been described based on Examples 1 to 4, the specific configuration is not limited to these Examples 1 to 4, and each of the claims Design changes and additions are permitted without departing from the scope of the claimed invention.

For example, in Examples 1 to 4, a round hole is shown as the shape of the hole. However, as long as the hole is a hole, the shape is not limited to a circle. For example, as shown in FIG. The hole 201b shown in FIG. 13 may be formed in a triangular shape, or may be formed in another shape such as another polygonal shape or an elliptical shape. Note that 101c in FIG. 12 and 201c in FIG. 13 indicate punched portions.
Also, the shape of the protrusion is not limited to a round shape like the protrusion 101a shown in FIG. 12, and may be formed in a shape other than a circle such as a quadrangle or an ellipse when embossing, for example. . Moreover, when forming in a protruding item | line shape like the bead part 201a shown in FIG. 13, you may form in the linear shape along a side. In this case, the example shown in FIG. 13 shows an example in which one ridge-shaped bead 201a is provided on one side of the triangular hole 201b, but for example, one side like a bead 301a shown in FIG. A plurality of them may be provided. In FIG. 14, 301b is a hole and 301c is a punched portion.

  Moreover, in the example shown in FIGS. 12-14, although the protrusion parts 101a, 201a, 301a have shown the example provided in the outer side of the to-be-punched part 101c, 201c, 301c, In the punched parts 101c, 201c, and 301c, when the punched parts 101c, 201c, and 301c are provided at portions that are pressed by the punch 5, the same operational effects as those of the third and fourth embodiments can be obtained.

  Moreover, as shown in Examples 1 to 4 and FIGS. 12 to 14, the number of protrusions including beads can be selected as appropriate, and is not limited to the illustrated number, and is at least one place, Desirably, it is preferably provided at a plurality of locations. Moreover, when providing in one place, it is desirable to form in the bead shape which has the length along a hole.

  In the first and second embodiments, the projection 1a and the bead 21a are projected upward, which is the side on which the punch 5 is provided (the upper side in the first and second embodiments). , 2, when the protruding portion is sandwiched between the die 2 and the stripper plate 3, the same effect can be obtained even if the protruding portion is formed in the downward direction opposite to that provided with the punch 5. .

DESCRIPTION OF SYMBOLS 1 Metal flat plate 1a Protrusion part 1b Hole 1c Punched part 1d Punch 2 Die 2a Die hole 3 Stripper plate 5 Punch 21a Bead (projection part)
31a Protrusion 41a Bead (Protrusion)

JP 11-57885 A Japanese Patent Laid-Open No. 9-234525 JP 7-214190 A JP-A-9-57363 JP-A-5-228545

Claims (5)

A clamping step of clamping the periphery of the punched portion of the metal flat plate with a die and a stripper plate;
A punch provided on the stripper plate side is inserted into a die hole formed in the die, the punched portion is punched, a hole is opened in the metal flat plate, and the punched portion is used as a punching piece to form the metal flat plate. A punching method comprising a punching process that is separated from and extruded into the die hole,
Before the clamping step, a protrusion curved in the shearing direction at a portion pressed in the shearing direction of the metal flat plate in either the clamping step or the punching step in the peripheral portion of the punched portion of the metal flat plate A protrusion forming step for forming a portion,
As a state in which the punched portion is pressed in the direction substantially orthogonal to the shearing direction by pressing the protrusion when deforming in the direction substantially orthogonal to the shearing direction when performing either the clamping step or the punching step, While performing the punching by the punch of the punching process,
In the projection forming step, the projection is provided outside the punched portion and at a portion sandwiched between the die and the stripper plate,
The punching method according to claim 1, wherein the projecting portion is pressed when the outer periphery of the punched portion of the metal flat plate is sandwiched between the die and the stripper plate during the holding step. The punching method according to claim 1 , wherein a plurality of the protrusions are provided along a periphery of the punched part. The punching method according to claim 2 , wherein a plurality of the projecting portions are provided symmetrically on the punched portion. The punching method according to any one of claims 1 to 3, wherein the protrusion is formed in a dot shape . The punching method according to any one of claims 1 to 3 , wherein the protruding portion is formed in an elongated bead shape extending in a direction along the outer periphery of the hole.

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