JPH05177600A - Punching die and sheet punching method - Google Patents

Abstract

PURPOSE:To eliminate wear likely generated on a cutting edge, lower die, etc., for punching a sheet from a plate-form material and perform punching certainly despite eventual wear partially by contacting the cutting edge of a punch to the lower die, etc., with a uniform pressure. CONSTITUTION:To the rear surface of a resin board 4 to which a cutting edge 2 is fixed, a cushion material 5 is adhered by pouring in a liquid of plastics. Otherwise, a resin board 4 is installed to the holddown part of a punching device through cushion material 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die and a punching method for punching an appropriately shaped sheet material from a plate-like body such as a corrugated cardboard sheet or a plastic sheet.

[0002]

2. Description of the Related Art For example, a corrugated cardboard box generally used as a packaging box is constructed by blanking blank corrugated cardboard sheets. This blank sheet is punched by using a punching die (upper die) in which a band-shaped cutting blade and a ruled line are arranged and fixed in a predetermined shape, and pressing the punching die against a corrugated cardboard sheet. As a conventional punching die, there is one in which a thin groove penetrating through a wooden plywood is provided, and a cutting blade or a ruled line is fitted and fixed in the thin groove. Also, there is a die-cutting type of resin board on which the cutting blades and the like are fixed by pouring a synthetic resin liquid after the cutting blades and the ruled lines are arranged and fixed on the base and solidifying the synthetic resin liquid. .. This resin board has many advantages over the one made of plywood, in that the manufacturing method is simpler, the height of the cutting edge is fixed, and the cutting edge is held firmly and there is no trouble such as falling off. Is.

In contrast to the punching die as described above, the lower die is formed with a pressing surface corresponding to the cutting blade and the ruled line of the punching die. This lower die is fixed on a cut plate provided in a punching device, a corrugated cardboard sheet or the like is sequentially supplied between the punching die and the lower die, and the cut plate is pressed from below, thereby successively forming a predetermined shape. Punched into sheet material. The punching speed by the punching device reaches up to about 8000 sheets per hour, and high precision is required for the punching die and the lower die. When punching a corrugated cardboard sheet or the like, the cut plate may be used as it is as a lower mold.

[0004]

However, in the conventional punching die and punching method, as the punching work is carried out for a long time, the cutting blade of the punching die and the lower die and the cut plate pressed by the cutting blade are partially cut off. Will wear out. Therefore, there has been a drawback that the punching of the sheet material cannot be performed completely.
For this reason, conventionally, so-called unevenness removal has been performed, in which a thin tape or the like is attached to the punching die mounting portion at the portion where the sheet material is defectively cut. To remove unevenness, in addition to directly attaching the unevenness removing tape to the punching die mounting portion of the punching device, it is also applied to the unevenness removing film stored in the punching die mounting portion, or it is attached to the back surface of the punching die.
This unevenness removing work required experience and required a considerable amount of time for adjustment. Further, since the unevenness removing work is extremely troublesome, it has been attempted to eliminate the defective cutting by increasing the punching pressure of the punching die. However, if this method is used, for example, what was normally punched with the axial pressure of a punching device of about 40t will endlessly increase the pressure to about 80t, and the cutting edge of the cutting edge will be crushed or the lower die As a result, the wear of the die and the cut plate is further promoted, and not only the punching die but also the lower die and the cut plate cannot be used, and the life of the die is significantly shortened.

In particular, since the cut plate is installed in the punching device, when the cut plate is used as the lower die, it is significantly different from the punching die or the lower die which is replaced by the sheet material to be punched. become. That is, although the surface thereof is required to have high hardness and accuracy and is extremely expensive, in the relationship with the punching die, the cutting blades in the first row of the punching die contact almost the same portion of the cut plate. As described above, since the punching die is attached to the punching device (which serves as a reference for positioning the punching die), there is a drawback in that the wear of that portion becomes remarkable. Once wear occurs in the portion of the cut plate corresponding to the first row cutting edge, it is attempted to eliminate it by removing unevenness in the punching die or increasing the driving pressure as described above, and therefore wear of that portion. Is further encouraged.
The depth of the recess due to wear of this portion may reach 100 to 300 μ. Therefore, unless a thick material such as cardboard is attached to the back surface of the punching die provided with the cutting blades in the first row, proper cutting cannot be performed, and the effect thereof is extremely great. In addition, this means that when there are a plurality of punching devices, the degree of wear of the cut plate installed in each punching device is different, and even if unevenness is removed by one punching die and adjustment is performed. When the punching die has to be attached to a punching device provided with another cut plate, the unevenness removing work is required again. For these reasons, the unevenness removing work is indispensable in the punching work of the sheet material, and the work efficiency is remarkably impaired.

[0006]

Therefore, the present inventor has achieved the present invention as a result of earnest research in view of the above problems, and is characterized in that a sheet material having a predetermined shape is formed from a plate-shaped body. The cutting blade provided with a pouring gate at an appropriate position is arranged and fixed on the surface of the base, and is an internal region of the frame material fixed around the cutting blade, which is the base of the base. In a resin board having the cutting edge fixed by pouring a synthetic resin solution onto the surface and solidifying the synthetic resin solution, a cushion material is attached to the back surface of the resin board.

Alternatively, it is a method of cutting a sheet material having a predetermined shape from a plate-like member, and after a cutting blade having a pouring gate at an appropriate position is arranged and fixed on the surface of the base, it is fixed around the cutting blade. In a resin board in which the cutting edge is fixed by pouring a synthetic resin liquid onto the surface of the base in the inner region of the frame material, the resin board is interposed with a cushion material. To attach it to the punching device.

The term "cushion material" as used herein refers to the back surface of the resin board and the punching device when it is attached to the back surface of the resin board or when the resin board is attached to the punching device. A thin plate-shaped elastic body interposed between the mounting portion and the mounting portion. This is, for example, synthetic rubber such as neoprene, butadiene styrene, or butyl, natural rubber, or foam. The cushioning material is interposed between the resin board and the mounting part of the punching device, so that the cutting edge is brought into contact with the lower mold or the cut plate with uniform pressure, and the cutting blade or the cut plate is partially worn. The purpose of the present invention is to prevent the occurrence of cracks, and to allow the elasticity of the cushion material to cut even if the cutting blade, the cut plate, or the like is partially worn, without causing unevenness.

The sticking of the cushion material to the resin board means sticking to the manufactured resin board with an adhesive or an adhesive. In addition, a step of placing a cushioning material on a substrate in advance when manufacturing a resin board, arranging and fixing a cutting blade or the like on the cushioning material, and pouring a synthetic resin liquid to solidify the synthetic resin liquid. Then, a method of adhering the cushion material to the resin board may be adopted. This cushion material
The resin board may be interposed when it is attached to the punching device, and thus may be attached or fixed to the attaching portion of the punching device.

The hardness and thickness of the cushion material are not particularly limited because they vary greatly depending on the material, shape and size of the sheet material to be punched. But,
In an experiment conducted by the present inventors, when a blank sheet having an average size and shape is punched out (the total extension length of the cutting edge is about 6000 mm), the thickness is about 1 mm, which is relatively large. The hard one seems to be preferable.

The term "plate-like body" means a thin plate-like body for obtaining a sheet material to be punched. This is, for example, cardboard or cardboard, plastic sheets or leather. The sheet material to be punched out is a blank sheet in the case of a cardboard box, the sole of a shoe such as rubber or leather, a printed circuit board of an electronic circuit, and various kinds of plastic stickers. The plate-shaped body in this case does not indicate only the raw material for obtaining the required sheet material, but also includes the case where the plate-shaped body is provided with holes or cutouts having appropriate shapes. That is, this is a case where a plate-shaped body after punching a sheet material is required.

The term "cutting blade" means a strip-shaped blade provided with a punching blade at its upper end. The cutting edge is fixed by abutting the lower end on the surface of the base. As a fixing method, a fixing tool such as a separate plate material or a separator (which holds the distance between the cutting blades) is used to fix the cutting blades in an upright state, or the magnetic force such as the electromagnetic chuck described above is used. Is. The arrangement of the cutting blade on the surface of the base is not particularly limited, but a film sheet having a pattern to be arranged is placed on the surface of the base, and the cutting blade is fixed along the pattern. Easy and accurate. Alternatively, a patterned iron plate or the like may be placed on a base so that the iron plate or the like can be reused.

After arranging and fixing the cutting blade on the base, the synthetic resin liquid is poured in. The synthetic resin liquid is flown into each space surrounded by the cutting blade and the ruled line, so that the cutting blade and the ruled line are appropriately placed. A pouring gate is provided. Further, by providing a pouring gate, when the synthetic resin liquid is solidified,
The parts surrounded by cutting blades can be communicated with each other without becoming independent. The pouring gate is a hole, a notch, or the like provided in a portion other than the blade portion of the cutting blade.
The shape is not particularly limited as long as it allows the synthetic resin liquid to flow, but a hole is preferable to a notch. That is, if the gate is a hole, the strength of the cutting edge itself becomes higher than that of the notch. Moreover, since there is no vertical warp,
There is an advantage that it is possible to prevent warpage that occurs during contraction when the poured synthetic resin liquid is solidified. Further, since the contact area of the cutting blade with the base does not decrease, it does not affect the fixing of the cutting blade on the board surface, and is strong against the force applied in the direction in which the cutting blade comes out of the resin board.

The term "base" means a plate-shaped or flat-shaped surface having a flat surface. The material may be wood, metal, or plastic. Further, it is preferable to have a structure in which a cutting edge or a ruled line is magnetically attracted and fixed to the surface of the substrate by a table-like electromagnetic chuck or a permanent magnet chuck. The cutting blade and the ruled line may be fixed directly on the surface of the base, but it is preferable to lay a film sheet or apply a release agent on the surface of the base.

The "synthetic resin liquid" may be any resin that has fluidity and solidifies after a lapse of a certain period of time, and is not particularly limited, but one having a small shrinkage factor upon curing is preferable. The resin used in the present invention is, for example, epoxy resin or urethane resin. Further, an aggregate or the like may be added to these resins. By pouring this synthetic resin liquid into the portion surrounded by the frame material on the base on which cutting blades and the like are arranged and fixed, a resin board with the cutting blades and the like fixed is formed, and a cushion material is attached to the resin board. It becomes a punching type. Further, when the resin board is attached to the mounting portion of the punching device, a cushion material is interposed between the back surface of the resin board and the mounting portion, and the sheet material is punched. When the resin board is formed by laying a film sheet on the base as described above, the film sheet may be attached to the back surface of the resin board, and in this case, the cushion material is attached via the film sheet. Stick or intervene.

"Punching device" means a device for punching a sheet material having a predetermined shape from a plate-like body by attaching a punching die. The punching mechanism is of a flat pressure type and is punched by the vertical movement of a flat fixed platen and a movable platen. A punching die or a resin board is generally attached to a fixed platen, and a movable platen is vertically moved to sequentially punch a sheet material from a plate-like body such as a blank sheet interposed therebetween. In the present invention, the punching die or the resin board may be attached to the movable surface plate depending on the type of punching device, and is not particularly limited. Further, the fixing method and structure are not particularly limited. Further, in the present invention, as described above, the cushion material is previously attached or attached to the attachment portion of the punching device, and the sheet material is punched by attaching the resin board via the cushion material. Good.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings.

FIG. 1 shows an example of a punching die 1 according to the present invention. A cushion is provided on the back surface of a resin board 4 in which cutting blades 2 and creases 3 arranged according to a punching pattern of a sheet material are fixed by pouring resin. It shows a state in which the material 5 is attached with an adhesive material. Cushion material 5 shown in this example
Is made of neoprene-based hard rubber having a thickness of 0.7 mm. Further, in this example, a mounting bracket 7 having a female screw formed in the center is mounted on the resin board 4, and is fixed to a mounting portion 6 of a punching device (not shown) with bolts.
For this reason, the cushion member 5 is provided with the holes 8 for inserting the bolts, but the positions and shapes of the mounting bracket 7 and the holes 8 are not limited.

The cushion material 5 need not be provided on the entire back surface of the resin board 4, but may be provided partially as shown in FIG. In this case, each cushion member 5 may have the same thickness and hardness, but may have different thickness and hardness depending on the arrangement of the cutting blades 2. For example, cutting edge 2
There is a case where a hard cushion material 5 is attached to a portion where a large number of particles are gathered, and a relatively soft cushion material 5 is attached to a portion where the cutting edges 2 are not so arranged. Further, even with the cushion material 5 having the same hardness, a slightly thick cushion material 5 may be attached to a portion where the cutting edges 2 are concentrated. From this point of view, as described above, the first plate which contacts the same portion of the cut plate (not shown)
It seems preferable to attach a relatively soft cushioning material 5 to the back surface of the cutting blade 9 in the row so as not to damage the cut plate.

FIG. 3 shows an example of the punching method of the sheet material according to the present invention. When the resin board 4 is attached to the attachment portion 6, the cushion material 5 is interposed so as to fix the sheet material. Punching out. Therefore, when the resin board 4 is attached in this manner, the same effect as that of the punching die 1 in which the cushion material 5 is attached to the resin board 4 described above is obtained. Further, as shown in FIG. 4, the cushion member 5 may be provided in advance on the mounting portion 6, and the resin board 4 may be mounted on this portion.
As described above, even when the cushion material 5 is interposed, the cushion material 5 may be divided into a plurality of portions to be interposed, and may have different hardness and thickness.

[0021]

As described above, the punching die according to the present invention is
The height of the cutting edge can be fixed firmly and firmly, and it can be easily and reliably manufactured. By attaching a cushion material to the back surface of the resin board, the uneven pressure applied during punching of the resin board is absorbed, and the cutting edge is cut. Since it can be pressed against the lower mold and the cut plate with uniform pressure, the cutting blade, the cut plate, and the like hardly cause partial wear. Even if the cutting edge or the cut plate is partially worn, the elastic force of the cushioning material compresses the non-wearing part, the worn part is not compressed, and the cutting edge does not Since it is pressed until it comes into contact with the surface of, it has an effect of preventing defective cutting. Further, according to the punching method for a sheet material according to the present invention, since it has the same effect as that of the punching die described above, the unevenness removing work is almost unnecessary, and the punching work can be continuously performed. Next to
This has an extremely beneficial effect of improving work efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a punching die according to the present invention.

FIG. 2 is a perspective view showing another example of a punching die.

FIG. 3 is a schematic side view showing an example of the method of the present invention.

FIG. 4 is a schematic side view showing another example of the method of the present invention.

[Explanation of symbols]

 1 Punching type 2 Cutting blade 3 Stamping rule 4 Resin board 5 Cushion material 6 Mounting part 7 Mounting bracket 8 Hole 9 Cutting blade of the 1st row

Claims (2)

[Claims] 1. A sheet material having a predetermined shape is cut from a plate-shaped body, and a cutting edge provided with a pouring gate at an appropriate position is arranged and fixed on the surface of a base, and then the cutting edge is provided around the cutting edge. In a resin board in which the cutting edge is fixed by pouring a synthetic resin liquid on the surface of the base in the inner region of the fixed frame material and solidifying the synthetic resin liquid, a cushion is provided on the back surface of the resin board. A punching die characterized by sticking materials. 2. A method of cutting a sheet material into a sheet having a predetermined shape from a plate-like body, wherein a cutting edge provided with a pouring gate at an appropriate position is arranged and fixed on the surface of a base, and then the cutting edge is surrounded. In a resin board in which the cutting edge is fixed by pouring a synthetic resin liquid onto the surface of the base in the inner region of the fixed frame material and solidifying the synthetic resin liquid, the resin board is provided with a cushion material. A punching method for a sheet material, which is characterized in that the sheet material is attached to a punching device via the punching device.