JP2676979B2 - Punching die and punching press - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a punching die, particularly a total punching die for obtaining a ring-shaped product, and a punching press machine using the same.

[Conventional technology]

Conventionally, as shown in FIG. 3, a total punching die for obtaining a ring-shaped product has been used. The punching die consists of an upper die 1 and a lower die 2, and the upper die 1 is an inner die punch 3
And a product knockout 4 surrounding the same, and a contour cutting die 5 on the outside thereof, and the lower die 2 comprises a ring-shaped punch 6 and a stripper plate 7 on the outside thereof. The internal punching punch 3 has a male cutting blade 3a at its tip, the ring-shaped punch 6 has a female cutting blade 6a and a male cutting blade 6b at its tip, and the external punching die 5 has a female cutting blade 5a at its tip. Have. At least the tip of the ring-shaped punch 6 can be positioned between the inner-shape punch 3 and the outer-shape punching die 5, and the male cutting blade 3a
The female cutting blade 6a, the male cutting blade 6b, and the female cutting blade 5a are corresponding cutting blades. Product knockout 4
Can move up and down relative to the inner punch 3
Facing the ring-shaped punch 6. The stripper plate 7 faces the outer shape cutting die 5 and is biased upward. A relief 31 is formed inside the ring-shaped punch 6, and the inner diameter is slightly larger in the lower portion. In FIG. 3, 8 is a material after punching, 9 is a ring-shaped product, and 10 is punching waste.

When punching the ring-shaped product 9 with this punching die, when the material is placed between the upper die 1 and the lower die 2 and the upper die 1 is lowered, the outer shape punching die 5 urges the material upward. Pressed against the stripper plate 7,
Is pushed down against the urging force, and the material is between the male cutting edge 3a of the inner punching punch 3 and the female cutting edge 6a of the ring punch 6 and the male cutting blade 6b of the ring punch 6b.
And the female cutting blade 5a of the outer shape cutting die 5 are punched in a ring shape by shearing force. The ring-shaped punch 6 serves both as a punch for the outer shape punching die 5 and as a die for the inner shape punching 3. Ring-shaped product 9
Is separated from the rest of the material 8 while being pressed against the upper end of the ring-shaped punch 6 by the downwardly biased product knockout 4. After punching, the upper mold that has reached the bottom dead center is raised to the top dead center, and the top of the product knockout 4 is hit (the spring bias may be used) to push down the ring-shaped product 9 and the upper mold 1 Between the lower mold 2 and the lower mold 2 and blown out of the mold by an air flow or the like caused by blowing compressed air. The punching scraps 10 on the inner side of the ring remain in the space inside the ring-shaped punch 6, and after stacking several sheets, they drop by their own weight and are discharged below the lower mold 2. This punching die can be used in a general-purpose press.

In addition to the above, there are several types of dies for punching more precise ring-shaped products, but all of them require an expensive dedicated press machine.

[Problems to be solved by the invention]

However, in the above-mentioned punching die, the punching scraps of the inner part of the ring-shaped product drop through the inside of the ring-shaped punch. It deforms under pressure. For this reason, the clearance between the inner shape punch and the outer shape punching die is changed, and the punching dimensional accuracy is deteriorated. Also, punching debris is clogged inside the ring-shaped punch, and it is sandwiched between the cutting edge of the inner-shaped punch and
These cutting blades could be damaged, which shortened the life of the mold. To avoid any of these problems, there is a relief inside the ring-shaped punch,
If it escapes, the rubbed ring-shaped punch will soon become unusable due to re-polishing, which will rather shorten the life of the punching die.

Other types of dies for precision punching of ring-shaped products, as mentioned above, require an expensive dedicated press machine, which increases the punching cost.

In a die for punching a ring-shaped product, in order to prevent deformation of the ring-shaped punch due to punching waste accumulated inside and damage to the cutting edge due to clogging of punching waste as described above, It is thought that it is sufficient to extrude the sheets one by one into the space between the upper mold and the lower mold, but in this case, the product and the punching waste may be mixed.

Therefore, an object of the present invention is to provide a punching die which can be used in a general-purpose press machine and can obtain a ring-shaped product with high dimensional accuracy.

Another object of the present invention is to provide a punching die which has a long life without causing damage to the cutting edge due to clogging of punching chips.

Still another object of the present invention is to provide a punching die that does not cause deformation of the ring-shaped punch due to punching dust and damage of the cutting edge due to clogging of punching dust, and separate the ring-shaped product and the punching dust inside the ring. The purpose is to provide a punching press machine that can be taken out.

[Means for solving the problem]

In the punching die according to the present invention, in order to obtain a ring-shaped product with good dimensional accuracy, to prevent damage to the cutting edge due to clogging of punching waste, and to prolong the life of the punching die, a male cutting edge is provided at the tip. Internal punching punch, ring punch with female cutting edge and male cutting edge at the tip,
Outer die having a female cutting edge at the tip, product knockout that is placed between the inner die punch and the outer die and movable toward the ring punch, and the outer die that is placed outside the ring punch In a punching die including a stripper biased toward, a lower die knockout capable of pressing the material flatly is provided between the tip of the inner die punch and the surface of the inner die punch.
In addition, a punch scrap knockout pin that can project toward the inner punch is provided in the center hole of the lower knockout.

Further, in the punching press of the present invention, a ring-shaped product is provided with a punching die that does not cause deformation of the ring-shaped punch due to punching dust and damage of the cutting edge due to clogging of punching dust, and separates the ring-shaped product from the punching dust inside the ring. In order to provide a punching press that can be taken out by taking out the punching die, the punching die can be punched with an inner die punch, a ring punch, an outer die, a product knockout arranged between the inner die and the outer die, and a ring punch. Along with the stripper arranged on the outside, punching waste knockout means that can project toward the inner punching punch is provided, and the ring-shaped product pushed out by the protrusion of the product knockout and the punching scrap pushed out by the protrusion of the punching waste knockout means. Is provided with a means for discharging the And a means for separating the discharged ring-shaped products and chippings by its flow.

In the punching die of the present invention, at least the tip of the ring-shaped punch can be located between the inner die-cutting punch and the outer-shape die by a minute clearance, and the male cutting blade on the outer side of the tip and the outer-die punching die. The material is punched onto the ring by a shearing force between the female cutting blade at the tip of and the female cutting blade inside the tip and the male cutting blade at the tip of the internal punch. The stripper presses the material between the surface of its tip and the outer shape punching die by urging during punching. The product knockout faces the ring-shaped punch,
At the time of punching, the ring-shaped punch restrains the lowering, and after punching, the lowering allows the ring-shaped product to be extruded.

When punching the inside of the ring-shaped product, the lower die knockout holds the material flat between the surface of the tip and the inner die punch. Therefore, it is desirable that the tip surface of the lower mold knockout be flat.

The punching scrap knockout pin projects from the tip of the lower mold knockout toward the inner mold punch after separating the upper mold and the lower mold after punching, thereby pushing out the punching scraps remaining on the lower mold knockout after punching. The knockout pin knockout pin (hereinafter referred to as a knockout pin) may be projected by a spring or the like.
The base may be pushed or tapped to project, and it may be advanced with screws. The lower die knockout may also serve as the knockout pin, and in this case, the urging force for pushing out the punching scraps after punching may be made larger than the urging force at the time of punching (of the inner punching punch).
When the lower die knockout and the knockout pin are provided separately, the lower die knockout does not need to project from the tip of the ring-shaped punch, and only the knockout pin needs to project, so the knockout pin is free for the lower die knockout, It must be able to move towards the internal punch. That is, the knockout pin is slidably provided with respect to the lower knockout. The knockout pin may be provided at the center of the lower knockout, or may be provided outside thereof, that is, between the knockout pin and the inner surface of the ring-shaped punch. The knockout pin may consist of multiple parts (eg, two parts separated by a lower knockout).

The punching press of the present invention has an upper die including an inner die punch, an outer shape die and a product knockout, and a lower die including a ring punch and a knockout pin (the upper die and the lower die have the opposite configurations). However, it is possible to punch, that is, the male cutting blade of the inner punch and the female cutting blade inside the ring punch, and the male cutting blade outside the ring punch and the female cutting blade of the outer die. In between, the material is punched into a ring by shearing forces. Even if the upper die of the punching die is moved with respect to the fixed lower die, conversely the lower die is moved with respect to the fixed upper die, or the upper die and the lower die are moved simultaneously. Good. After moving the upper die or lower die from the first dead center to the second dead center for punching, retract it to the first dead center to remove the punched ring-shaped product and punching scraps from the mold. , Release the combination of upper and lower molds. When the upper die and the lower die are moved at the same time, each movement has a first dead center and a second dead center.

In the punching press of the present invention, the punching scrap knockout means provided in the punching die is the same as the knockout pin described above for the die. The punching die of the press machine is preferably provided with a lower die knockout urged toward the inner die punch, inside the ring die punch. The lower die knockout is the same as that described above for the punching die (the lower die knockout may also serve as the knockout pin).

In the punching press of the present invention, in order to discharge the ring-shaped product and the punching scraps out of the punching die by air flow, compressed air may be blown out from the nozzle, nitrogen,
A gas stream other than air such as argon may be used. As a means for separating the ring-shaped product discharged by the air flow and the punching waste, for example, a separation plate provided between the upper mold and the lower mold is convenient. You may use the duct etc. which take in each air flow containing a product and waste respectively.

[Action]

In the punching die according to the present invention, for example, when the upper die is lowered, the material is pressed between the outer shape punching die and the urged stripper and between the inner die punching and the lower die knockout to make the ring punch, the inner die The material is punched into a ring shape by a shearing force between the cutting blades at the tips of the punching die and the punching die. At the inner part of the ring-shaped product during punching, the lower die knockout holds the material against the inner die-cutting punch, so that the inner edge of the punched ring-shaped product hardly returns and the inner edge is Since most of the surface is a sheared surface, the dimensional accuracy is remarkably improved as compared with a conventional mold without a lower knockout.

After punching, the upper die and the lower die are separated, and the product is knocked out to push out the ring-shaped product in the opposite direction of the punching.
On the other hand, by making the tip of the knockout pin inside the lower die knockout project beyond the tip of the ring punch, the punching dust remaining inside the ring punch is pushed out from the inside of the ring punch before the next punching. The punching dust that remains inside the ring-shaped punch is removed one by one every time it is punched out, and there is no overlap, so the ring-shaped punch will not be deformed by the force from the inside, which reduces the dimensional accuracy. There is nothing to do. Further, since the punching dust is not clogged inside the ring punch, the punching dust is not caught between the inner punch and the ring punch to damage the cutting blades.

The punching die according to the present invention has a structure in which the lower die knockout and the knockout pin are simply added to the inside of the ring-shaped punch of the conventional punching die, and therefore can be used in a general-purpose press machine.

The punching press according to the present invention, after punching, discharges punching dust between the upper die and the lower die each time by the punching dust knockout means inside the ring-shaped punch.
Punching waste does not accumulate inside the ring-shaped punch, and the ring-shaped punch is not deformed by it.

The punching die according to the present invention is different from the conventional punching die in that both the ring-shaped product and the punching waste are discharged between the upper die and the lower die. In the punching press according to the present invention, both the ring-shaped product and the punching waste are discharged between the upper die and the lower die of the punching die, and the ring-shaped product blown off by the air flow and the punching waste are separated by the separating means. , They can be separated and collected without being mixed with each other.

 Hereinafter, the present invention will be described in more detail with reference to Examples.

〔Example〕

An example of a punching die according to the present invention is shown in FIGS. 1 (A) and 1 (B). FIG. 1 (A) shows a state in which the upper die 1 of the punching die is near the bottom dead center, and FIG. 1 (B) shows a state in which the upper die 1 of the punching die returns to the vicinity of the top dead center after punching. , Respectively.

The punching die comprises an upper die 1 and a lower die 2, and the upper die 1 is an inner die punch 3 and a product knockout 4 surrounding it.
Furthermore, the outer shape die 5 is provided. The lower die 2 has a ring-shaped punch 6, a stripper plate 7 on the outside thereof, a lower die knockout 11 on the inside of the ring-shaped punch 6, and a knockout pin 12 penetrating the center thereof. The inner cutting punch 3 has a male cutting blade 3a at the tip, the ring-shaped punch 6 has a female cutting blade 6a on the inner side of the tip, the male cutting blade 6b on the outer side, and the outer shape cutting die 5 has a female cutting blade 5a at the tip. , Respectively. The stripper plate 7 faces the outer shape cutting die 5 and is biased upward. The product knockout 4 can slide between the inner punch 3 and the outer die 5, and the lower end 4a can protrude from between them. The tip of the ring punch 6 can be located between the inner punch 3 and the outer die 5 and faces the lower end 4a of the product knockout 4. The lower die knockout 11 is urged upward by a spring 11c that abuts on the base portion 11b, and is displaced up and down. A small amount projects from the upper end of the punch 6. The knockout pin 12 is biased upward by a spring 12c that abuts a lower end 12b, and its upper end 12a can project from the upper end 11a of the lower mold knockout 11 to a predetermined height. In FIG. 1, 8 is a material, 9 is a ring-shaped product, and 10 is punching waste.

When the ring-shaped product is punched by the punching die shown in FIG. 1, the material 8 is placed horizontally between the upper die 1 and the lower die 2 and the upper die 1 is lowered, as shown in FIG. 1 (A). As shown, the falling profiler die 5 forces the material 8 against the upwardly biased stripper plate 7 to push the stripper plate 7 down against the bias. When the stripper plate 7 is pushed down from a free position slightly higher than the tip of the ring-shaped punch 6 to a height of the tip of the ring-shaped punch 6 and further to a position lower than that, the material 8 becomes a male outside the tip of the ring-shaped punch 6. Female cutting edge of die cutting edge 6b and outer shape cutting die 5
5a and between the female cutting blade 6a on the inner side of the tip and the male cutting blade 3a of the inner punching punch 3 are punched in a ring shape by shearing force. The ring-shaped punch 6 serves both as a punch for the outer shape punching die 5 and as a die for the inner shape punching 3. When punching the inside of the ring-shaped product 9, the material 8 is pressed between the lower die knockout 11 and the inner die-cutting punch 3 which are biased upward,
The inner edge of the punched ring-shaped product 9 is barely seen back, and the dimensional accuracy is significantly improved. The ring-shaped product 9 is separated from the other parts of the material 8 while being pressed against the upper end of the ring-shaped punch 6 by the product knockout 4 which is biased downward. After punching, when the upper die 1 that has reached the bottom dead center by descending a little further is raised again,
As shown in FIG. 1 (B), the knockout pin 12 is a spring.
Since it is urged upward by 12c, its upper end 12a projects from the upper end 11a of the lower die knockout 11, and the punching dust 10 generated inside the ring-shaped punch 6 is pushed out of the lower die 2. After the upper die 1 has risen to the top dead center, when the upper end of the product knockout 4 is tapped, the ring-shaped product 9 is pushed out between the upper die 1 and the lower die 2. The punching waste 10 and the ring-shaped product 9 that have been pushed out are blown out of the mold by an air flow as described later.

Most of the inner edge of the stamped ring-shaped product 9 has a sheared surface, and the inner edge is hardly bent. Further, during the punching work, the ring-shaped punch 6 is not clogged with punching chips.

An example of a punching press according to the present invention is shown in FIG.
The punching press shown in FIG. 2 includes an upper die set 21 and a lower die set 22, and the upper die set 21 can be moved up and down. The upper die 1 of the punching die is fixed to the lower portion of the upper die set 21, and the lower die 2 of the punching die is fixed to the upper portion of the lower die set 22. An air nozzle 23 is arranged on the left side of the upper mold 1, and an air nozzle 24 is arranged on the left side of the lower mold 2. A separation plate 25 is provided on the right side between the upper mold 1 and the lower mold 2, and a product chute 26 is provided on the right side thereof. Upper die set
A product knockout rod 27 is connected to the product knockout 4 through 21.

The operation of the press machine shown in FIG. 2 will be described below. When the upper die set 21 is lowered by lowering a ram (not shown), the upper die 1 fixed to the lower portion thereof is lowered toward the lower die 2. As described above, the material (not shown) is punched in a ring shape between the tip of the ring-shaped punch 6 and the outer shape punching die 5 and the inner die-cutting punch 3, and the upper die set 21 is further lowered to the bottom dead center. Reach When the upper die set 21 is raised again, the upper end 12a of the knockout pin 12 biased upward projects from the upper end 11a of the lower die knockout 11, and the punching waste 10 is pushed out of the lower die 2. After the upper die set 21 reaches the top dead center, when the top of the product knockout rod 27 is tapped, the product knockout 4 connected to the lower end thereof is pushed down, and the ring-shaped product 9 becomes the upper die 1.
Is pushed downwards. Extruded ring-shaped product 9
Is blown out of the mold toward the right in the figure by the air flow blown from the air nozzle 23, is further sent to the right along the upper surface of the separation plate 25, and is sent to the product chute 26. On the other hand, the punching scrap 10 extruded above the lower mold 2
Is blown off to the right in the figure by the air flow blown out from the air nozzle 24, is sent further to the right along the lower surface of the separation plate 25, and is collected in a punching waste container (not shown) via a chute (not shown). It Since the ring-shaped product 9 and the punching waste 10 extruded between the upper mold 1 and the lower mold 2 and blown off are separated by the separating plate 25, they can be recovered without being mixed with each other.

〔The invention's effect〕

According to the punching die of the present invention, most of the inner edge of the punched ring-shaped product has a sheared surface, and the deformation of the ring-shaped punch due to punching scraps accumulated in the die does not occur. Will get better. Further, it is not necessary to release the inside of the ring-shaped punch, and the cutting edge is not damaged due to clogging of punching chips in the die, so that the life of the die is extended. Further, since the punching die of the present invention can be used in a general-purpose press machine, the dimensional accuracy is good and the punching cost is low.

According to the punching press machine of the present invention, the deformation of the ring-shaped punch of the punching die does not occur, the dimensional accuracy of the product is improved, and the damage of the cutting edge due to the clogging of punching scraps in the die does not occur. Mold life is long. Further, according to the punching press of the present invention, even if the ring-shaped product punched by the punching die and the punching scraps from the ring inner part are both extruded between the upper die and the lower die of the punching die, they are They are taken out separately without being mixed with each other.

[Brief description of the drawings]

1 (A) and 1 (B) are sectional views showing an embodiment of a punching die according to the present invention, FIG. 2 is a partial sectional view showing an embodiment of a punching press according to the present invention, and FIG. FIG. 6 is a sectional view showing a conventional punching die. Explanation of symbols 1 …… Upper mold 2 …… Lower mold 3 …… Internal punching punch 3a …… Male cutting blade of internal punching 4 …… Product knockout 4a …… Product knockout lower end 5 …… Outside punching die 5a ...... Female cutting edge of die for die cutting 6 …… Ring type punch 6a …… Male cutting edge outside ring tip of ring type punch 6b …… Female cutting edge inside ring tip of ring type punch 6c …… Ring type punch Lower end 7 …… Stripper plate 8 …… Material 9 …… Ring-shaped product 10 …… Punching scrap 11 …… Lower mold knockout 11a …… Lower mold knockout upper end 11b …… Lower mold knockout base 11c …… Spring 11d …… Lower mold knockout base collar 12 …… Knockout pin 12a …… Knockout pin upper end 12b …… Knockout pin lower end 12c …… Spring 21 …… Upper die set 22 …… Lower die set 23,24 …… Air Nozzle 25 …… Separator 26 …… Product shoot 27 …… Product knockout rod 31 …… Escape

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Zenichi Yoshida 3-1-1 Sukegawa-cho, Hitachi-shi, Ibaraki Electric Wire Factory, Nitrate Electric Wire & Cable Co., Ltd. (56) References: Syo 59-148146 (JP, U) )

Claims (2)

(57) [Claims] 1. An inner die punch having a male cutting blade at its tip, a ring punch which can be positioned outside the inner die punch and has a female blade and a male blade at its tip, and said ring. The outer shape cutting die which can be located outside the shape punch and has a female cutting edge at the tip, the product knockout arranged between the inner shape punch and the outer shape cutting die, and the outer shape of the ring shape punch. Punching die for obtaining a ring-shaped product, wherein the product knockout is movable relative to the ring-shaped punch, the stripper being biased towards the profile punching die. In the inside of the ring-shaped punch, a knockout capable of pressing the material flat between the inside of the ring-shaped punch and the surface of the tip of the inner-shaped punch and the ring-shaped punch A punching die, which is provided with a punching scrap knockout pin that can protrude from the tip toward the inner punching punch. 2. An inner die-cutting punch having a male cutting blade at its tip, a ring-shaped punch which can be located outside the inner die-cutting punch and has a female cutting edge and a male cutting edge at its tip, and said ring. An outer shape punching die having a female cutting blade at the tip which can be located outside the shape punch, a product knockout disposed between the inner shape punching die and the outer shape punching die and movable toward the ring shaped punch, And a punching press machine for obtaining a ring-shaped product, the punching die having a stripper arranged on the outside of the ring-shaped punch and biased toward the contour punching die, wherein: Inside the ring-shaped punch, there is provided punching scrap knockout means capable of projecting from the tip of the ring-shaped punch toward the inner-shape punch, and the product knockout. Means for discharging the ring-shaped product extruded by the protrusion of the punching scrap and the punching scraps extruded by the protrusion of the punching scrap knockout means by an air flow to the outside of the punching die, and the ring-shaped product and the punching scraps discharged by the air flow. A punching press machine characterized by being provided with a separating means.