JPH07241634A - Button die - Google Patents

Abstract

PURPOSE:To provide a button die in which slug float is surely prevented by a simple structure. CONSTITUTION:A punched hole is formed, by a pressurized lowering of an upper die toward a lower die of a press, on a work arranged between a punching blade provided in a punch and the die; and the punched hole of the work is cut by a cutting blade provided on the upper side of the punching blade of the punch, forming a die cutting blade 3e for forming a hole for attaching a member, on the periphery of the upper end side of the die inner wall 3c. The button die 3 is provided with air blow holes 3h, 3i, 3j, 3k, in plural places, which are communicated from the outer wall 3b to the inner wall 3c of the die in the tangential direction of the inner wall 3c and which is for bringing in pressurized air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a button die used in a punching hole forming apparatus which is arranged so as to face a punch and presses a workpiece.

[0002]

2. Description of the Related Art Conventionally, a button die used in a punching hole forming apparatus arranged to face a punch and punching out a workpiece has a cylindrical shape and is formed on the inner peripheral edge of the die inner wall on the punch side. It is known that a die cutting edge is formed. Such a button die is supported by a die plate on the lower press die, and has a punching blade at the tip of a punch for forming a round hole, the base end side of which is fixed to the upper press die that is pressed down against the lower press die. A predetermined position of the work piece is sheared by the die cutting edge to generate punch residue and form a punched hole. The dregs are sucked by the vacuum pump arranged below the inner wall of the die, and are forcibly dropped below the inner wall of the die to be removed. And
In the vicinity of the punched hole of the work piece in which the punched hole is formed, the fracture surface is work hardened when sheared by the punching blade of the punch and the die cutting edge of the button die, so serration is press-fitted into the hardened punched hole. In order to prevent the shaft member such as the pivot shaft to be crushed from being crushed, the side edge of the punched hole is cut by a cutting means installed in another place and the punched hole is cut to reduce the hardness to the ground of the work piece. The same circular member mounting holes are obtained.

[0003]

In the punching hole forming apparatus using the above-mentioned button die, when the punch comes into contact with the workpiece, the contact surface of the punch and the contact surface of the workpiece become parallel to each other. The air between both sides is expelled, and when a load is applied to the punch in this state, a bending moment acts not a little on the work piece under the punch, that is, the part that is punched and left behind, and the air under the punch is removed. When the pressure is reduced and the punching blade and the die die cutting edge of the button die are compressed during punching, the punch dust is completely sealed along the contour, and when the punch reaches bottom dead center and then returns. It is known that the punch may rise while it is still attached to the punch, causing so-called scrap rise, and a vacuum placed below the inner wall of the die to prevent scrap rise. If you try to suck in the scraps under the punch with a pump, there is a large suction force to remove the scraps in the sealed state from the bottom surface of the punch that has the same shape as the punching blade of the punch. A large vacuum pump is required, and if a large vacuum pump is installed, it may be difficult to install the punching hole forming processing device in a limited space and it may be disadvantageous in terms of noise in the factory. There are problems, and it has been a problem to solve the above problems.

[0004]

It is an object of the punch according to the present invention to provide a button die which has a simple structure and is capable of surely preventing scraping.

[0005]

[Constitution of the invention]

[0006]

A button die according to claim 1 of the present invention comprises a die body formed in a substantially cylindrical shape,
Fixed on the die outer wall which is on the outer peripheral side of the die main body and is supported by the die plate on the press lower die, and on the press upper die which is on the inner peripheral side of the die main body and presses down toward the lower press die. A punch hole is formed in the inner wall of the die into which the punch is inserted and on the upper edge of the inner wall of the die. And a die cutting blade that forms a member mounting hole by cutting a punching hole of a workpiece with a cutting blade provided on the upper side of the punching blade of a punch, and a die inner wall that is arranged on the upper end side of the inner wall of the die. The button die according to claim 2 of the present invention is characterized in that it has a structure in which it is connected to the inner wall of the die from the outer wall of the die in the tangential direction and has a plurality of air blow holes for introducing pressurized air. Outer wall and da In between the plate are formed on the annular concave groove, and the that the air introducing portion communicating with the air blow holes are provided, according to claim 3 of the present invention
In the button die according to the present invention, an air feeding section is formed between the outer wall of the die and the die plate, which is formed in a concave groove shape from the lower end of the outer wall of the die toward the upper end side thereof. Pressurized air generating means is communicatively connected to the feeding part, and the button die according to claim 4 of the present invention has a die inner wall and a die outer wall by being formed into a substantially cylindrical shape. It is supported by the lower press die, facing the punch fixed to the upper die, and when the punch is pressed down by the upper press die, it fits with the punching blade formed on the punch, and A button die having a die cutting edge for forming a punched hole on the inner wall of the die, wherein a plurality of air blow holes communicating from the outer wall of the die to the inner wall of the die are formed in the tangential direction of the inner wall of the die.

[0007]

In the button die according to the first aspect of the present invention, the pressurized air is introduced from the outer wall of the die into the inner wall of the die tangentially to the inner wall of the die through a plurality of air blow holes. Therefore, since the pressurized air is blown with a large pressure between the punching blade of the punch and the punch residue under the punch, when the punching hole is formed in the work piece by the punch, the punch residue under the punch is The punch works to release the sealing condition and imparts a swirl force to the draft to make the draft move toward the lower part of the inner wall of the die while swirling along the inner wall of the die. When a hole for mounting a member is formed on the punch, it is blown with a large pressure between the shaving blade of the punch and the shavings under the shaving blade, so a turning force is applied to the shavings scraped from the punching hole. While turning along the inner wall of the die, the forced wind force directed to the lower side of the inner wall of the die acts on the scraps. In the button die according to the second aspect of the present invention, since the pressurized air is introduced into the air blow hole from the air introducing portion, the pressure of the pressurized air between the die outer wall and the die plate is kept uniform in the air introducing portion. Be drunk Therefore,
Pressurized air introduced from the air blow hole to the inside of the inner wall of the die is blown with a uniform pressure between the punching blade of the punch and the punch residue under the punch. When formed, it acts to unseal the punch residue underneath the punch, and imparts a swirl force to the punch residue to turn along the inner wall of the die and force the wind force downward toward the inner wall of the die. When punched to form a member mounting hole in the work piece, it is sprayed with a uniform pressure between the shaving blade of the punch and the shavings below the shaving blade. A turning force is applied to the shavings scraped from the hole to turn along the inner wall of the die and force the wind force directed downward of the inner wall of the die to act on the shavings. In the button die according to the third aspect of the present invention, the pressurized air generated by the pressurized air generating means is guided to the air introducing section via the air feeding section on the outer wall of the die. Therefore, it is not necessary to form a complicated flow path for air feeding in the die plate, and the pressurized air is blown with a large pressure between the punching blade of the punch and the punch residue under the punch, so that the punch When a punching hole is formed in the work piece by the work, it works to release the sealing condition of the punch residue under the punch and imparts a turning force to the punch residue while turning along the die inner wall When a punch is used to form a member mounting hole in the work piece, a large amount of pressure is applied between the shaving blade of the punch and the shavings under the shaving blade when the punch is used to form a member mounting hole. Since it is sprayed with the shavings, a turning force is applied to the shavings shaved off from the punched hole, and the shavings are forced to turn downward along the inner wall of the die while turning along the inner wall of the die. In the button die according to claim 4 of the present invention, since the pressurized air introduced into the air blow hole is blown between the punching blade of the punch and the punch residue under the punch, the punch of the punch residue under the punch is punched. It acts so as to release the sealed state against the inner wall of the die and gives a swirl force to the sludge to swirl along the inner wall of the die so that the forced wind force directed downward of the inner wall of the die acts on the sludge.

[0008]

1 to 10 show a first embodiment of a button die according to the present invention and a punching hole forming apparatus using this button die.

The illustrated button die 3 is used in the punching hole forming / processing apparatus 1 shown in FIG. 4, and the punching hole forming / processing apparatus 1 mainly includes a punch 2, the button die 3 and
The press upper die 4 fixing the punch 2, the die plate 5 fixing the button die 3, the press lower die 6 supporting the die plate 5, and the press upper die 4 are applied to the press lower die 6. A guide post 7 for lowering the pressure and a pressurized air generating means 8 for generating pressurized air for feeding the inside of the button die 3 are provided.

As shown in FIG. 5, the punch 2 has an implant portion 2b formed on the base end side of the punch body 2a having an axial shape, a punching portion 2c formed on the tip end side of the punch body 2a, and a punching punch. A cut portion 2d formed at a predetermined distance above the portion 2c and a neck portion 2e formed between the punched portion 2c and the cut portion 2d are provided.

Since the implanting portion 2b has an outer diameter dimension D0 and is fixed to the upper press die 4 provided in the punching hole forming apparatus 1, the punching portion 2c is arranged above the button die 3 described later.

The punching portion 2c is located at a position opposite to each other on the outer edge of the punching portion main body 2c1 formed in a cylindrical shape, and the punching upper die 4 is pressed down toward the lower pressing die 6 (from the upper side in FIG. 5). (Below) there are formed two convex portions 2c2, 2c3 having a length corresponding to the height dimension of the punched portion main body 2c1 and slightly protruding toward the outer peripheral side. At the end, the convex portion 2c2,
A punching blade 2c4 is formed on the peripheral edge including 2c3. The punching portion main body 2c1 of the punching portion 2c has an outer diameter dimension D1.
This outer diameter dimension D1 is predetermined as smaller than the inner diameter dimension D50 of the member mounting hole 50h to be formed in the pivot arm 50 shown in FIG. In addition, as shown in FIG.
The outer dimension L1 between the c2 and 2c3 is equal to
It is equal to the outer diameter dimension D2 of the shaving blade 2d1 formed in. The height dimension of the punched portion 2c is preset according to the thickness dimension of the workpiece such as the pivot arm 50.

As shown in FIG. 7, the punching portion 2c is punched in a shape corresponding to the outer shape of the punching portion main body 2c1 including the convex portions 2c2, 2c3 as the press upper die 4 is pressed down toward the press lower die 6. Pivot arm 50 with blade 2c4
8 is punched out to remove the non-circular scrap 50a, the cut 50b1 corresponding to the protrusions 2c2, 2c3 is formed on the pivot arm 50, as shown in FIG.
It has a function of forming a punching hole 50b having 50b2 and forming two half-moon shaped cutting margins 50b3, 50b4 on the side edge of the punching hole 50b by the notches 50b1, 50b2. External dimensions L of the convex portions 2c2, 2c3
Since 1 is equal to the outer diameter dimension D2 of the shaving blade 2d1 of the shaving portion 2d, the outer diameter dimension of the half-moon shaped shaving margins 50b3 and 50b4 matches the outer diameter dimension D2 of the shaving blade 2d1. Further, the protrusions 2c2, 2c3 are not limited to two locations, but may be a plurality of locations. In that case, the side edges of the punching hole 50b are each provided with a shaving margin separated by a plurality of notches. It

The scraped portion 2d has a cylindrical shape having an outer diameter dimension D2 which is larger than the outer diameter dimension D1 of the cylindrical portion of the punched portion 2c and which is equal to the outer dimension dimension L1 of the convex portions 2c2, 2c3 of the punched portion 2c. , Sharpening blade 2d1 on the edge of the edge
Are formed. The outer diameter dimension D2 of the shaving blade 2d1 is predetermined to be substantially equal to the inner diameter dimension D50 of the member mounting hole 50h formed in the pivot arm 50.

The shaving portion 2d is sheared by the punching blade 2c4 of the punching portion 2c, and then the upper press die 4 is further pressed and lowered toward the lower press die 6,
The half-moon-shaped shavings 50b3, 50b4 of the punched holes 50b each having the separated half-moon-shaped shavings 50b3, 50b4 having two cuts 50b1, 50b2.
As shown in FIG. 9, by performing a cutting process on the half-moon shaped scraps 50b3 and 50b4, the half-moon shaped scraps 50b5 and 50b are divided into two parts corresponding to the separated half-moon shaped scraps 50b3 and 50b4.
6 has a function of forming 6 to form a member mounting hole 50h at a predetermined position of the pivot arm 50. At this time, the separated half-moon shaped cutting margins 50b3 and 50b4 are cut 50b while being cut by the cutting blade 2d1.
1 and 50b2 are crushed and connected to each other so as to be smaller, but a sharpening blade 2d1 is attached to the die cutting blade 3a of the button die 3.
Is cut off from the pivot arm 50 when the cutting passes and the cutting is completed, and at the same time, it is separated from the pivot arm 50. Therefore, due to the momentum at that time, the punched portion 2c of the punch 2 is not sealed and the half-moon shaped scrap 50b is divided into two.
It becomes 5, 50b6 and falls.

The shaving part 2d has separated half-moon shaped shaving margins 50b3, 50 on the side edges of the punching hole 50b formed by the punching blade 2c4 of the punching part 2c.
Since b4 is cut, work hardening hardly occurs in the vicinity of the side edge of the member mounting hole 50h formed by the above cutting.

The neck portion 2e is a punched portion main body 2 of the punched portion 2c.
It is arranged between the punched portion 2c and the scraped portion 2d as having an outer diameter dimension D3 smaller than the outer diameter dimension D1 of c1 and smaller than the outer diameter dimension D2 of the scraped portion 2d. On the punched portion 2c side, there is formed a tapered inclined surface 2e1 having an outer diameter set to increase as it approaches the punched portion 2c.
The volume of the gap portion 2e2 which the neck portion 2e having e1 has between the punched portion 2c and the scraped portion 2d is set to be larger than the volumes of the half-moon shaped scraps 50b5 and 50b6 scraped by the scraped portion 2d.

The neck portion 2e is the punching blade 2 of the punching portion 2c.
After the shearing is performed by c4, the half-moon shaped scraps 50b5, 50 generated when the half-moon shaped margins 50b3, 50b4 are cut by the shaving part 2d.
b6 is dropped into the above-mentioned gap 2e2 formed between the die 3 and the die cutting edge 3a provided in the button die 3 described later, and the tapered inclined surface 2e1 is used before the punch 2 reaches the bottom dead center. Inner wall 3b of the button die 3
It has the function of dropping toward the inside without being caught.

In the button die 3, as shown in FIG. 1, a die outer wall 3b provided on the outer peripheral portion of a die body 3a formed in a substantially cylindrical shape is inserted into a die hole 5a provided in a die plate 5 in FIG. It is supported by the die plate 5 by tightening a die fixing means (not shown).

The upper end side of the die inner wall 3c provided in the inner peripheral portion of the die body 3a corresponds to the outer diameter dimension D2 of the scraped portion 2d of the punch 3 fixed to the press upper die 4, and the scraped portion 2d. The punch insertion portion 3d has a round hole shape having an inner diameter dimension D5 which is slightly larger than the outer diameter dimension D2, and a die cutting edge 3e is formed on the upper edge of the punch insertion portion 3d.

On the upper side of the die body 3a, an air introducing portion 3f in the form of an annular groove is formed on the die outer wall 3b, and between the lower end of the die outer wall 3b and the air introducing portion 3f. Since the air feeding portion 3g having a groove shape is formed in the groove, the air feeding portion 3g and the air introducing portion 3f are connected to and communicate with each other between the die outer wall 3b and the die plate 5.

Further, at four locations on the circumference of the air introducing portion 3f which are opposed to each other, round air blow holes 3h, 3i, which communicate with the die inner wall 3c from the die outer wall 3b side in the tangential direction of the die inner wall 3c, Since 3j and 3k are respectively formed, the air feeding portion 3g and the die inner wall 3c are provided through the air blow holes 3h, 3i, 3j, 3k and the air introducing portion 3f.
Communicates with the inner part of the. Air blow holes 3h, 3
Since i, 3j, and 3k open inside the die inner wall 3c in the tangential direction of the die inner wall 3c, when pressurized air generated by the pressurized air generating means 8 described later is introduced into the die inner wall 3c. It has a function of blowing the above-mentioned pressurized air toward the center of the die cutting edge 3e and blowing it while rotating downward along the die inner wall 3c. Here, as shown in FIG. 3, the air blow holes 3h, 3i, 3j, and 3k are not limited to those arranged at four opposite positions on the circumference of the air introducing portion 3f, and the pressurized air of the punch 2 is not limited to the ones. It is preferable to dispose the air introducing portion 3f at a plurality of positions on the circumference so as to collide with the side surface.

On the other hand, as shown in FIG.
An air hole 5b communicating with the outside is formed in the die hole 5a. One of the air holes 5b is communicatively connected to a valve (not shown) provided in the pressurized air generating means 8 through an air supply pipe 8a, and the other is inside the die hole 5a and an air supply portion of the button die 3 is provided. It is connected to 3g. Since the air feeding part 3g of the button die 3 is formed on the die outer wall 3b, no means for connecting the air hole 5b to the air feeding part 3g is necessary, and therefore the air hole 5b is a simple round hole. It is formed into a shape. Further, since the air introducing portion 3f of the button die 3 is formed on the die outer wall 3b inside the die hole 5a of the die plate 5, the air introducing portion 3f introduces the air blow holes 3h, 3i, 3j, 3k. The pressurized air that is applied is set to a uniform pressure.

When the pressurized air generating means 8 is operated, it supplies pressurized air to the air feeding portion 3g of the button die 3 through the air feeding pipe 8a and the air hole 5b.
The pressurized air is spread to the air blow holes 3h, 3i, 3j, 3k by the air introducing portion 3f, and the air blow holes 3
Wind power is generated from h, 3i, 3j, and 3k toward the center of the die cutting edge 3e, and wind power is swung along the inner wall 3c of the die with the inner side of the inner wall 3c of the die being turned downward.

Pressurized air directed from the respective air blow holes 3h, 3i, 3j, 3k to the center of the die cutting edge 3e is supplied to the button die 3
Between the side of the punching blade 2c4 of the punch 2 and the side of the punching residue 50b below the punch 2 and the side of the shaving blade 2d1 of the punch 2 and the shavings 50b5, 5 in the punch inserting portion 3d.
0b6 collides with the side portion of the punch 2 when punching holes 50b are formed in the workpiece 50 by the punch 2.
It works so as to release the sealing condition between the punch residue 50a and the punch 2 located below, and imparts a turning force to the draw residue 50a to turn it below the die inner wall 3c while turning it along the die inner wall 3c. When the wind force is generated and the punch 2 forms the member mounting hole 50h in the workpiece 50, it works so as to release the sealing state between the cutting blade 2d1 and the punch 2, and the scrap 50b5 scraped from the punching hole 50b. , 50b6 is applied with a turning force to turn the scraps 50b5, 50b6 along the inner wall 3c of the die while generating a wind force directed toward the lower side of the inner wall 3c of the die. Therefore, the punch residue 50a punched by the punching blade 2c4 of the punch 2 is not sealed to the punch 2,
The shavings 50b5 and 50b6 scraped off by the shaving blade 2d1 of the punch 2 are quickly separated from the punch 2 and are forcedly dropped below the inner wall 3c of the die. Let it fall.

The punching hole forming / processing apparatus 1 using the button die 3 having such a structure forms and processes a punching hole in accordance with the procedure shown in FIGS. 7, 8, 9 and 10.

The button die 3 is fixed to the die plate 5,
By fixing the implanting part 2b of the punch 2 to the press upper die 4, the punching part 2c of the punch 2 is arranged above the punch inserting part 3d of the button die 3 and the upper side corresponding to the die cutting edge 3e of the button die 3. Place the pivot arm 50 on.
Therefore, when the press upper die 4 is pressed down to the press lower die 6 by the guide post 7 after operating the pressurized air generating means 8, the punching blade 2c4 included in the punching portion 2c of the punch 2 is As shown in FIG. 7, the punching hole 50b having the notches 50b1 and 50b2 shown in FIG. 8 is formed by descending to the inside of the die cutting edge 3e of the button die 3 and shearing the pivot arm 50 at a predetermined position. 50b
Half-moon shaped shavings 50b3, 50b4 separated on the side edge of
Are formed respectively.

At this time, when a predetermined position of the pivot arm 50 is sheared by the punching blade 2c4, the punching blade 2c4 is a non-circular shape corresponding to the convex portions 2c2, 2c3, and the pivot arm 50 corresponding to the punching blade 2c4. Since the punched-out portion of is also non-circular, it is difficult to achieve a sealed state between the contact surface of the punched-out portion 2c and the contact surface of the pivot arm 50, and the air blow holes 3h, 3
Pressurized air directed from i, 3j, 3k toward the center of the die cutting edge 3e collides with the punching blade 2c4 of the punch 2 that has entered the punch insertion portion 3d of the button die 3 and the side portion of the punch residue 50a. The punch 2 is prevented from being sealed with the punch 50a punched by the punching portion 2c, the punch 50a is separated from the punch 2, and each of the air blow holes 3h,
3i, 3j, 3k along the die inner wall 3c along the die inner wall 3
Due to the pressurized air that swirls the inside of c downwards, the above-mentioned debris 50a quickly separates from the punch 2 and is forcibly dropped below the die inner wall 3c. The scrap 50a that has fallen below the die inner wall 3c is accommodated in a bucket 9 installed below the lower press die 6 through a small hole 6a formed in the lower press die 6.

Since the upper press die 4 is further pressed and lowered with respect to the lower press die 6, the shaving blade 2d of the shaving portion 2d is used.
By cutting the half-moon shaped cutting margins 50b3 and 50b4 separated at the side edge of the punching hole 50b, the member mounting hole 50h is formed at a predetermined position of the pivot arm 50.

At this time, the cutting margins 50b3, 50b
4 is crushed so as to make the cuts 50b1 and 50b2 smaller while being cut by the shaving blade 2d1 and connected to each other, and at the same time when the cutting is finished by the shaving blade 2d1, it is scraped off from the pivot arm 50 and the mutual connection is elastic. The shaving margins 50b3 and 50b4 are separated from each other, and as shown in FIG. 9, two shavings 50b are removed.
5 and 50b6 fall into the die cutting edge 3a of the button die 3 and fall into the gap 2e2 between the neck 2e of the punch 2 and the die cutting edge 3a of the button die 3 and then the punch 2 Before it reaches the bottom dead center, the taper-shaped inclined surface 2e1 drops toward the inside of the die inner wall 3b provided in the button die 3 without being caught, and the die cutting blade 3e is pushed through each of the air blow holes 3h, 3i, 3j, 3k. The pressurizing air directed to the center of the punch has entered the punch insertion portion 3d of the button die 3 and the shaving blade 2d1 of the punch 2 and the shavings 50b5, 5b.
The cutting blade 2d1 of the punch 2 collides with the side portion of 0b6.
The shavings 50b5 and 50b6 scraped by the shavings are separated from the punch 2, and the shavings are removed by the pressurized air swirling the inside of the die inner wall 3c downward from the air blow holes 3h, 3i, 3j, 3k along the die inner wall 3c. Dregs 50b5,
50b6 quickly separates from the punch 2 and is forcibly dropped below the die inner wall 3c. The scraps 50b5 and 50b6 that have fallen below the die inner wall 3c are also accommodated in the bucket 9.

During this time, while the punch 2 performs a single stroke from the top dead center to the bottom dead center by the press upper die 4 pressing and lowering the press lower die 6, the punch 2 has a punching portion 2c. A step of forming a punching hole 50b by the punching blade 2c4 thus formed and the die cutting edge 3e of the button die 3, and a sharpening blade 2d formed in the sharpening portion 2d of the punch 2.
1 and the die cutting edge 3e of the button die 3 for punching holes 5
The step of cutting 0b to form the member mounting hole 50h is performed at one time.

[0032]

As described above, according to the button die according to the first aspect of the present invention, the pressurized air is supplied from the outer wall of the die to the inner wall of the die in the tangential direction of the inner wall of the die through a plurality of air blow holes. In order to introduce it inside, when punching holes in the work piece with a punch, pressurizing air is blown with a large pressure between the punch blade of the punch and the punch residue under the punch, and the punch under the punch. While unraveling the sealing condition of the dregs to the punch and giving a swivel force to the dregs to swirl along the inner wall of the die, forcibly drop it below the inner wall of the die, and the punch formed a hole for mounting the member on the workpiece. At this time, since it is blown with a large pressure between the shaving blade of the punch and the shavings underneath the shaving blade, a turning force is applied to the shavings scraped from the punched holes to move along the inner wall of the die. According to the button die according to the second aspect of the present invention, the pressurized air is introduced from the air introducing portion to the air blow hole, so that the die outer wall and the die outer wall are rotated. When the pressure air between the die plate and the die plate is kept at a uniform pressure, when the punched hole is formed in the workpiece by the punch by the pressure air introduced from the air blow hole to the inside of the die inner wall,
Pressurized air is blown at a stable pressure between the punching blade of the punch and the punch residue under the punch to release the sealing condition of the punch residue under the punch and to give a swivel force to the punch residue. When the die is forcibly dropped below the inner wall of the die while swiveling along the inner wall to form a hole for mounting a member on the workpiece by the punch, between the sharpening blade of the punch and the shavings under the sharpening blade. In order to blow the powder with a stable pressure toward it, a turning force is applied to the shavings scraped from the punched hole to make the shavings turn along the inner wall of the die and forcibly fall below the inner wall of the die. According to the button die, since the pressurized air generated by the pressurized air generating means is guided to the air introduction portion via the air feeding portion on the outer wall of the die, a complicated air feeding passage is formed in the die plate. Must do Instead, it may be a simple round hole, and pressurized air is introduced from the outer wall of the die into the inner wall of the die tangentially to the inner wall of the die through air blow holes at multiple locations. When forming a hole, pressurized air is blown with a large pressure between the punching blade of the punch and the punch residue under the punch, and the seal state of the punch residue under the punch is released and the swirl swirls. When force is applied to the die inner wall while it is swung along the inner wall of the die to forcefully drop it below the inner wall of the die to form a member mounting hole in the workpiece with the punch, the blade is under the sharpening blade and under the sharpening blade. Since it is sprayed with a large pressure toward the shavings, a turning force is applied to the shavings scraped from the punching hole to swirl along the inner wall of the die and forcefully drop it below the inner wall of the die. According to the fourth aspect of the present invention, since the pressurized air introduced into the air blow hole is blown between the punching blade of the punch and the punch residue under the punch, the punch residue under the punch is removed. A large vacuum pump is used to prevent the scrap from rising because the punch is forced to fall below the inner wall of the die while being swung along the inner wall of the die by giving a swivel force to the punch to cause it to unseal. It is possible to install in a limited space as compared with the one that requires, and there is no cause of being disadvantageous in terms of factory noise, and it is possible to reliably prevent scraping with a very simple structure. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is an external perspective view of an embodiment of a button die according to the present invention.

FIG. 2 is a partially longitudinal side view of the button die shown in FIG.

3 is a sectional view of the button die shown in FIG. 2 taken along the line AA.

4 is a partially longitudinal side view of a punched hole forming apparatus using the button die shown in FIG.

FIG. 5 is a front view of a punch in the punched hole forming processing apparatus shown in FIG.

6 is a bottom view of the punch shown in FIG.

7 is a combination diagram of a button die and a punch for explaining the procedure of a punching hole forming method in the punching hole forming apparatus using the button die shown in FIG.

8 is a plan view of the work piece at the stage shown in FIG. 7. FIG.

9 is a combination diagram of a button die and a punch for explaining the procedure of a punching hole forming method in the punching hole forming apparatus using the button die shown in FIG.

10 is a plan view of the work piece at the stage shown in FIG. 9. FIG.

[Explanation of symbols]

 2 Punch 2c4 Punching blade 2d1 Sharpening blade 3 Button die 3a Die body 3b Die outer wall 3c Die inner wall 3e Die cutting edge 3f Air introduction part 3g Air feeding part 3h Air blow hole 3i Air blow hole 3j Air blow hole 5 Press upper die 4 Die plate 6 Press lower mold 8 Pressurized air generating means 50 Work piece 50b Punch hole 50h Member mounting hole

Claims (4)

[Claims] 1. A die main body formed in a substantially cylindrical shape, a die outer wall which is provided on an outer peripheral side of the die main body and is supported by a die plate on a lower press die, and an inner peripheral side of the die main body. A die inner wall into which a punch fixed to the press upper die is inserted, which is pressed down toward the press lower die, and a press down of the press upper die with respect to the press lower die, which is formed on the upper edge of the die inner wall. By forming a punching hole in the work piece arranged between the punching blade provided in the punch, and shaving the punching hole in the work piece with the sharpening blade provided above the punching blade of the punch. A die cutting edge that forms a member mounting hole and a plurality of air blow holes that are arranged on the upper end side of the die inner wall and communicate with the die inner wall from the die outer wall in the tangential direction of the die inner wall to introduce pressurized air. That Button die to butterflies. 2. The button die according to claim 1, wherein an air introduction portion formed in an annular groove shape and communicating with an air blow hole is provided between the outer wall of the die and the die plate. 3. An air feeding portion is formed between the outer wall of the die and the die plate in a groove shape from the lower end of the outer wall of the die toward the upper end thereof, and the air feeding portion communicating with the air introducing portion is provided. The button die according to claim 3, wherein a pressurized air generating means is communicatively connected to the feeding portion. 4. A substantially cylindrical shape having a die inner wall and a die outer wall, facing the punch fixed to the press upper die, and supported by the press lower die, the punch being the upper die. A button die provided with a die cutting edge on the inner wall of the die for forming a punching hole in a workpiece by fitting with a punching edge formed on the punch when the pressure is lowered by A button die characterized in that a plurality of air blow holes communicating from the outer wall of the die to the inner wall of the die are formed in the tangential direction of the inner wall.