JPH0428425A - Die and press machine for punching - Google Patents

Abstract

PURPOSE:To prevent the punch of ring shape from being deformed by providing the lower die knockout incorporating the knockout-pin for the punched layer inside the punch of ring shape of the lower die and discharging the punched scrap at every punching time. CONSTITUTION:The material 8 is mounted horizontally between the upper die 1 and the lower die 2, by lowering the upper die 1 and pressing the stripper plate 7 down, the material 8 is punched in the ring shape at between the male die cutting blade 6b of the punch 6 of ring shape and the female die cutting blade 5a of the outer shape punching die 5, and at between the female die cutting blade 6a and the male die cutting blade 3a of the inner shape punching punch 3. Next, when the upper die 1 is elevated, because the knockout pin 12 is energized with the spring 12c, so its top end 12a projects from the upper end 11a of the lower die knockout 11, the punched scrap 10 in the punch 6 is pushed out from the lower die 2. Further, when the upper end of the products knockout 4 of the upper die 1 is knocked, the ring shaped products 9 is pushed to between the upper die 1 and the lower die, and is blown out from the die together with the punched scrap 10 by the air flow. Therefore, no punched scrap fills the ring shaped punch 6 during the punching time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a punching die, and particularly to a complete punching die for obtaining a ring-shaped product and a punching press using the same.

[Conventional technology]

Conventionally, the catfish punching mold for obtaining ring-shaped products was
The one shown in the figure was used.

The punching die consists of an upper die 1 and a lower die 2. The upper die 1 is equipped with an inner punch 3, a product knockout 4 surrounding it, and an outer die 5 on the outside thereof, and the lower die 2 is a ring-shaped punch. 6 and stripper brakes 1 and 7 on the outside thereof. The inner shape punch 3 has a tip Fi 4. m AN-type cutting blade 3a, ring-shaped bread 100 has a female-type cutting blade 6a and male-type cutting blade 6b at the tip; At least the tip of the bread 100 can be located between the inner punch 3 and the outer punch 5, and includes a male cutting blade 3a and a female cutting blade 6a, and an a-shaped cutting blade 6b and a female cutting blade 5a. The product knockout 4 can move vertically relative to the inner punch 3 and faces the ring-shaped punch 16.

The stripper plate 7 faces the outline cutting die 5,
Forced upward. A relief 31 is formed inside the ring-shaped pan 100, and the inner diameter of the portion below it is slightly larger. In FIG. 3, 8 indicates the material after punching, 9 indicates a ring-shaped product, and 10 indicates punching waste.

When punching out the ring-shaped product 9 with this punching die,
” When a material is placed between the second mold 1 and the lower mold 2 and the upper mold 1 is lowered, the outline cutting die 5 presses the material against the stripper plate 7 which is urged upward, and the stripper plate 7 As the material is pushed down against the force, the material is removed between the male cutting edge 3a of the inner punch 3 and the female cutting edge 6a of the ring punch 6, and between the male cutting edge 6b of the ring punch 6 and the outer shape. A ring shape is punched out by shearing force between the punching die 5 and the female cutting blade 5a of the punching die 5. The ring-shaped punch 6 serves both as a punch for the outer punch die 5 and as a die for the inner punch 3. The ring-shaped product 9 is pressed against the upper end of the ring-shaped punch 6 by the product knockout 4 urged downward, and the material 8
separated from the rest of the . After punching, the upper die that has reached the bottom dead center is raised to the top dead center and the top of the product knockout 4 is struck (sometimes using a spring bias).
The ring-shaped product 9 is pushed down, pushed out between the upper mold 1 and the lower mold 2, and blown out of the mold by an air flow caused by blowing compressed air. The punching waste 10 from the inner part of the ring remains in the space inside the ring-shaped punch 6, and after forming several molds, it falls under its own weight and is discharged below the lower mold 2. This punching die can be used with a general-purpose press machine.

In addition to the above-mentioned molds, there are several types of molds for punching more precise ring-shaped products, but all of them require expensive dedicated presses.

[Problem to be solved by the invention]

However, with the above-mentioned punching die, the punching waste from the inner part of the ring-shaped product falls through the inside of the ring-shaped punch, so the ring-shaped punch is damaged from the inside by the punching waste accumulated inside. It deforms slightly under pressure. For this reason, the clearance between the inner punch and the outer punch die changes, impairing the dimensional accuracy of punching. In addition, punching debris may become clogged inside the ring-shaped punch and become caught between the cutting blades of the inner punch and damage the cutting blades, thereby shortening the life of the mold. In order to avoid some of these problems, a relief is provided inside the ring-shaped punch, but if there is only a relief, the worn ring-shaped punch will become unusable due to regrinding sooner, and the punching die will deteriorate. Life expectancy will be shortened.

Other types of molds for precision punching of ring-shaped products require expensive dedicated presses, as mentioned above, which increases the cost of punching.

In a mold for punching ring-shaped products, in order to prevent the ring-shaped punch from being deformed due to punching debris accumulated inside the ring-shaped punch as described above, and the cutting blade from being damaged due to clogging of punching debris, it is necessary to remove the punching debris each time after punching. - It may be possible to extrude the sheets one by one between the upper mold and the lower mold, but if this is done, there is a risk that the product and punching waste may get mixed together.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a punching die that can be used even with a general-purpose press machine and can produce a ring-shaped product with good dimensional accuracy.

Another object of the present invention is to provide a punching die that does not cause damage to the cutting blade due to clogging with punching debris and has a long life.

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 waste or breakage of the cutting blade due to clogging of punching waste, and which separates the ring-shaped product from the punching waste on the inner side of the ring. The object of the present invention is to provide a punching press machine that can be taken out.

[Means to solve the problem]

In the punching die according to the present invention, in order to obtain a ring-shaped product with good dimensional accuracy, and to prevent damage to the cutting blade due to clogging with punching waste, and to extend the life of the punching die,
An internal punch with a male cutting blade at the tip, a ring punch with a female cutting blade and a male cutting blade at the tip, an external punch with a female cutting blade at the tip, an internal punch and an external punch. In a punching die comprising a product knockout disposed between and movable toward the ring-shaped punch, and a stripper disposed on the outside of the ring-shaped punch and biased toward the outer punch die, A lower die knockout capable of pressing the material flat between the tip surface and the ring-shaped punch is provided inscribed in the ring-shaped punch, and a punching waste knockout pin capable of protruding toward the inner die punch is provided in the center hole of the lower die knockout. Established.

Furthermore, the punching press machine of the present invention is equipped with a punching die that does not cause deformation of the ring-shaped punch due to punching debris or damage to the cutting blade due to clogging of punching debris, and the punching press machine is provided with a punching die that prevents the ring-shaped product from being deformed by punching debris or damage to the cutting blade due to clogging of punching debris. In order to provide a punching press machine that can be separated and taken out, the punching dies are divided into an inner punch, a ring punch, an outer punch, a product knockout placed between the inner punch and the outer die, and a ring punch. together with a stripper disposed on the outside of the punch, the ring-shaped product is pushed out by the protrusion of the product knockout, and the punched product is pushed out by the protrusion of the punch waste knockout means. Means for discharging the scraps out of the punching die by airflow is provided, and means for separating the ring-shaped product discharged by the airflow from the punching scraps is provided.

In the punching die of the present invention, at least the tip of the ring-shaped punch can be positioned between the inner punch and the outer punch with a slight clearance, and the male cutting blade on the outside of the tip and the outer punch die. The material is punched out in a ring shape by shearing force between the female cutting blade at the tip of the punch and the female cutting blade inside the tip and the male cutting blade at the tip of the inner punch. During punching, the stripper presses the material between the surface of its tip and the outline punching die by force.

The product knockout faces the ring-shaped punch, and is prevented from descending by the ring-shaped punch during punching, and can descend after punching to push out the ring-shaped product.

The lower die knockout is used when punching out the inside of a ring-shaped product.
The material is pressed flat between the surface of the tip and the inner punch. Therefore, it is desirable that the tip of the lower mold knockout has a flat surface.

The punching waste knockout pin pushes out punching waste remaining on the lower die knockout after punching by protruding from the tip of the lower die knockout toward the inner die punch after separating the upper die and the lower die after punching. The punching waste knockout pin (hereinafter referred to as knockout pin) may be made to protrude by being biased by a spring or the like, may be made to protrude by pushing or hitting the base, or may be made to protrude by using a screw. The knife-shaped knockout may also serve as a knockout bin, and in this case, the biasing force for pushing out punching waste after punching may be greater than the biasing force (of the inner punch) during punching. When the lower die knockout and knockout bin are provided separately, the lower die knockout does not need to protrude beyond the tip of the ring-shaped punch, and only the knockout bin needs to protrude, so the knockout bin can be freely attached to the lower die knockout. , must be able to move toward the inner punch. That is, the knockout bin is slidably provided relative to the lower mold knockout. The knock-out bottle may be provided in the center of the lower knock-out, or it may be provided on the outside of the knock-out, that is, between the inner surface of the ring-shaped punch. The knockout bin may consist of multiple parts (eg, two parts separated by a lower knockout).

The punching press machine of the present invention has an upper die consisting of an inner punch, an outer die and a product knockout, and a lower die consisting of a ring punch and a knockout bin.The structure of the upper die and the lower die can be reversed. between the male cutting edge of the inner punch and the female cutting edge of the ring punch, and between the male cutting edge of the outer ring punch and the female cutting edge of the outer punch. , the material is punched out into a ring shape by shearing force. It is possible to move the upper die of a rolling die relative to a fixed die, conversely move the lower die relative to a fixed upper die, or move the upper and lower dies simultaneously. You can. After moving the upper or lower mold from the first dead center to the second dead center for punching, the punched ring-shaped product and punching waste are removed from the mold:
Then, move it back to the first dead center and release the combination of upper and lower molds. When the upper mold and the lower mold are moved simultaneously, each movement has a first dead center and a second dead center.

In the punching press of the invention, the punching waste knockout means provided in the punching die is the same as the knockout bin described above for the die. It is preferable that the punching die of the press machine is further provided with a lower die knockout inside the ring-shaped punch that is biased toward the inner die punch.The lower die knockout is also the same as described above for the punching die. (The lower type knockout may also serve as the knockout bin).

In the punching press machine of the present invention, in order to discharge the ring-shaped product and punching waste to the corner of the punching die by airflow, compressed air may be blown out from a nozzle, or a gas flow of a gas other than air such as nitrogen or argon may be used. may also be used. A simple means for separating the ring-shaped product discharged by the air flow and the punching waste is, for example, a separation plate provided between the upper mold and the lower mold.

Ducts or the like may be used to take in airflows containing product and waste, respectively.

[Effect]

In the punching die according to the present invention, for example, when the upper die is lowered, the material is pressed between the outer die and the biased stripper and between the inner die punch and the lower die knockout, and the material is pressed between the ring-shaped punch and the inner die. The material is punched out into a ring shape by shearing force between the cutting blades at the tips of the punch and the die.

During punching, on the inside of the ring-shaped product, the lower die knockout presses the material between the inner punch and the inner edge of the punched ring-shaped product, so there is almost no curling of the inner edge, and the inner edge is Since most of the part is a sheared surface, dimensional accuracy is significantly improved compared to conventional molds that do not have a lower knockout.

After punching, the upper die and the lower die are separated, and the ring-shaped product is pushed out in the opposite direction to the punching process by the product knockout, while the tip of the knockout bin inside the lower die knockout is made to protrude beyond the tip of the ring-shaped punch. According to
Punching waste remaining inside the ring-shaped punch is pushed out from within the ring-shaped punch before the next punching. The punching waste remaining inside the ring-shaped punch is removed one by one each time punching is performed, and the rings do not overlap, so the ring-shaped punch is not deformed by force from the inside, resulting in poor dimensional accuracy. There's nothing to do.

Furthermore, since the inside of the ring-shaped punch is not clogged with punching debris, punching debris will not be caught between the inner punch and the ring-shaped punch and damage their cutting blades.

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

In the punching press machine according to the present invention, after punching, the punching debris is discharged between the upper die and the lower die each time by the punching debris knockout means inside the ring-shaped punch, so that the punching debris does not accumulate inside the ring-shaped punch. There is no
This prevents deformation of the ring-shaped punch.

The punching die according to the present invention differs from conventional punching dies in that both the ring-shaped product and the punching waste are discharged between the upper die and the lower die. Both the product and the punching scraps are discharged between the upper and lower molds of the punching die, and the ring-shaped product and the punching scraps blown away by the airflow are separated by a separating means, so they can be separated without mixing with each other. can be collected by doing so.

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

〔Example〕

Examples of the punching die according to the present invention are shown in FIGS.
Figure 1 (A) shows the state in which the upper die l of the punching die is near the bottom dead center, and Fig. 1 (B) shows the state in which the upper die l of the punching die is near the top dead center after punching. The respective states are shown below.

The punching die consists of an upper die 1 and a lower die 2, and the upper die 1 includes an inner punch 3, a product knockout 4 surrounding it, and an outer die 5 outside the punch. The lower mold 2 includes a ring-shaped punch 6, a stripper plate 7 outside the ring-shaped punch 6, a lower mold knockout 11 inside the ring-shaped punch 6, and a knockout bin 12 passing through the center thereof. The inner punch 3 has a male cutting blade 3a at the tip and a ring punch 6.
has a female cutting blade 6a on the inside of the tip and a male cutting blade 6b on the outside, and the outline cutting die 5 has a female cutting blade 5a on the tip. The stripper plate 7 faces the outline cutting die 5 and is urged upward. The product knockout 4 can slide between the inner punch 3 and the outer punch die 5,
The lower end 4a can protrude from between them. The tip of the ring-shaped punch 6 can be located between the inner punch 3 and the outer punch die 5, and faces the lower end 4a of the product knockout 4. The lower mold knockout 11 has a base 11b.
It is biased upward by the spring llc that comes into contact with the ring-shaped punch 6, and is displaced up and down. However, as the flange portion lid of the base comes into contact with the lower end 6C of the ring-shaped punch 6, its upper end 11a moves a minute distance from the upper end of the ring-shaped punch 6. stand out. The knockout bin 12 is biased upward by a spring 12c that abuts a lower end 12b, and its upper end 12a can protrude from the upper end 11a of the lower mold knockout 11 to a predetermined height. In FIG. 1, reference numeral 8 indicates a material, 9 indicates a ring-shaped product, and 10 indicates punching waste.

A ring-shaped product is punched out using the punching die shown in Fig.
When the material 8 is lowered, as shown in FIG.
Press down against the bias. When the stripper plate 7 is pushed down from its free position slightly higher than the tip of the ring-shaped punch 6 to the height of the tip of the ring-shaped punch 6 or even lower, the material 8 is removed from the outer tip of the ring-shaped punch 6. A ring is formed between the die cutter 6b and the female cutter 5a of the outer die 5, and between the female cutter 6a on the inside of the tip and the male cutter 3a of the inner die 3 due to shearing force. It is punched out in a shape. The ring-shaped punch 6 serves both as a punch for the outer punch die 5 and as a die for the inner punch 3. When punching the inside of the ring-shaped product 9, the material 8 is pressed between the upwardly biased lower die knockout 11 and the inner punch 3, so that the inner edge of the ring-shaped product 9 is punched out. There is almost no warping, and dimensional accuracy is significantly improved. The ring-shaped product 9 is separated from the rest of the material 8 while being pressed against one end of the ring-shaped pan by the product knockout 4 which is urged downward. After punching, it descends a little further and reaches the bottom dead center.1. When the upper mold 1 is raised by 1 again, as shown in FIG. The punching scraps 10 that protrude from the ring-shaped punch 6 and are formed inside the ring-shaped punch 6 are pushed out of the lower die 2. After the upper mold 1 has risen to its dead center, the upper end of the product knockout 4 is struck, and the ring-shaped product 9 is pushed out between the upper mold 1 and the lower mold 2. The extruded punching waste 10 and the ring-shaped product 9 are blown into the mold 1 by an air stream as described later, for example.

Most of the inner edge of the punched ring-shaped product 9 is a sheared surface, and almost no curling of the inner edge is observed. Further, the ring-shaped punch 6 is not clogged with punching waste during the punching operation.

An example of a stamping press according to the invention is shown in FIG. The punching press machine shown in FIG. 2 includes an upper die set 21 and a square die set 22, and the die set 21 is movable up and down. A punching die 1-1 is fixed to the lower part of the upper die set 21, and a lower die 2 of the punching die is fixed to the upper part of the lower die set 22. An air nozzle 23 is arranged to the left of the upper mold 1, and an air nozzle 24 is arranged to the left 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. A product knockout rod 27 is connected to the product knockout 4 through the second die set 21.

The operation of the press shown in FIG. 2 will be explained below. When the upper mold die set 21 is lowered by the lowering of a ram (not shown), the upper mold 1 fixed to the lower part of the upper mold die set 21 is lowered toward the lower mold 2. As described above, a material (not shown) is punched into a ring shape between the tip of the ring-shaped punch 6 and the outer punch die 5 and the inner punch 3, and the upper die set 21
is further lowered to reach bottom dead center. When the type 2 die set 21 is raised again, the upper end 12a of the knockout bin 12, which is being forced upward, is moved to the lower die knockout 1.
The punching scraps 10 protrude from the upper end 11a of the die 1 and are pushed out of the lower die 2. - After the ring-shaped die set 21 reaches the top dead center, when the top of the product knockout port 7 door 27 is tapped, the product knockout 4 connected to its lower end is pushed down, and the ring-shaped product 9 is moved below the upper mold 1. pushed out.

The extruded ring-shaped product 9 is blown to the right in the figure by the air flow blown from the air nozzle 23 into the mold row, and is further sent to the right along the upper surface of the separating plate 25 to the product chute 26. sent to. On the other hand, the punching scraps 10 pushed upward from the lower die 2 are sent to the air nozzle 24.
Instead of being blown out, the punched paper is blown off to the right in the figure by the air current, sent further to the right along the lower surface of the separating plate 25, passes through a shade (not shown), and is collected in a punched waste container (not shown). Since the ring-shaped product 9 and the punching waste 10 pushed out and blown away between the upper die 1 and the lower die 2 are separated by the separation plate 25, they can be recovered without being mixed with the waste.

〔Effect of the invention〕

According to the punching die of the present invention, most of the inner edge of the punched ring-shaped product becomes a shearing surface, and the ring-shaped punch is not deformed due to punching debris accumulated in the die, resulting in dimensional accuracy of the product. gets better. In addition, only the inside relief of the ring-shaped punch is required, and the cutting blade is not damaged due to clogging of punching chips in the mold, so the life of the mold is extended.Furthermore, the punching mold of the present invention , it can be used with a general-purpose press machine, so it has good dimensional accuracy and the cost of punching is low.

According to the punching press machine of the present invention, the ring-shaped punch of the punching die does not deform, so the dimensional accuracy of the product is improved, and the cutting blade is not damaged due to clogging of punching waste in the die. The life of the mold is long. Furthermore, according to the punching press machine of the present invention, even if the wing-shaped product punched by the punching die and the punching waste from the inner part of the ring are both extruded between the upper die and the lower die of the punching die, are separated and taken out without mixing with each other.

[Brief explanation of the drawing]

1(A) and (B) are cross-sectional views showing one embodiment of a punching die according to the present invention, FIG. 2 is a partial cross-sectional view showing one embodiment of a punching press machine according to the present invention, and FIG. is a sectional view showing a conventional punching die. Explanation of symbols 1-・--1------・Upper mold 2----------・--Lower mold 3-Inner punch 3a・--Male cutter of the inner punch Blade 4...---
---------One product knockout 4 a---------
1. Lower end of product knockout 5. ---1-------
~Shape punch 5a...-Female cutting blade 6 of the shape punch 6 Ring-shaped punch 6a...-1---Male cutting blade 6 on the outside of the tip of the ring-shaped punch k)----Ring Female cutting blade 6 inside the tip of the punch 6 c - Lower end of the ring punch 7
--- Stripper plate 8 --- Material 9 --- Ring-shaped product 10 --- Punching scraps 11 --- 1- ------Lower mold knockout 11a---Lower mold knockout upper end 1l b------Base 11 of lower mold knockout
cm・------Spring 11 d---------One lower type knockout base top part 12--------- Knockout pin 12 a
---Top end of knockout bin 12 b----
Bottom end 12c of one-knock out bin 12c...-Spring 21...--Upper guide set 22--Lower guide set 3, 24-
−1−−−・・−Air nozzle 5・−・・−・−Separator plate 6・−・・−・・Product chute 7−−−−−・−−1−−Product knockout lot 1・−
・・・・・・－Escape Rad

Claims (2)

[Claims] (1) An internal punch with a male cutting blade at the tip, a ring punch that can be located outside of the internal punch and has a female cutting blade and a male cutting blade at the tip, the ring punch an outer shape punching die that can be located on the outside of the ring-shaped punch and has a female cutting blade at its tip, a product knockout that is arranged between the inner shape punch and the outer shape punch die, and a product knockout that is arranged on the outside of the ring-shaped punch. Equipped with a stripper,
In a punching die for obtaining a ring-shaped product, the product knockout is movable relative to the ring-shaped punch, and the stripper is biased toward the outline punch die. A knockout pin capable of pressing the material flat between the tip surface of the inner punch and a punching waste knockout pin capable of protruding from the tip of the ring-shaped punch toward the inner punch is provided inside the ring-shaped punch. A punching mold characterized by: (2) An internal punch having a male cutting blade at the tip, a ring punch that can be located outside the internal punch and having a female cutting blade and a male cutting blade at the tip, the ring punch a product knockout disposed between the inner punch and the outer punch die and movable toward the ring punch; A punching press machine for obtaining a ring-shaped product, the punching die having a stripper disposed outside the ring-shaped punch and biased toward the outer die, the ring-shaped die of the punching die being Provided inside the punch is a punching waste knockout means that can protrude from the tip of the ring-shaped punch toward the inner punch, and the ring-shaped product pushed out by the protrusion of the product knockout and the protrusion of the punching waste knockout means. A punching press machine comprising: means for discharging punching waste extruded by the punching die to the outside of the punching die by an air current; and means for separating the ring-shaped product and the punching waste discharged by the air flow.