JPH04129700A - Manufacture of punch die - Google Patents

Abstract

PURPOSE:To fix a cutting blade simply and correctry, by arranging a cutting blade provided with a gate for flowing-in with its fixing in the specified shape to the foundation bed on which surface a magnetic field is formed, and solidifying the internal zone of the frame member fixed to the circumference of the cutting blade with a synthetic resin. CONSTITUTION:A cutting blade 2 and push member 9 are fixed with their attraction by a magnetic force onto the board face of a magnetic chuck 1. The arrangement pattern of the cutting blade 2, etc., is to punch a blank sheet for assembling a carton for example. A flowing-in gate is provided at adequate place on the cutting blade 2 and push member 3. A frame member 4 fixed onto the magnetic chuck 1 upper face by surrounding the circumference of the cutting blade 2 is arranged in accordance with the size of the fitting part of the punch die of a punch device. After fixing the cutting blade 2 and frame member 4 onto the board face of the magnetic chuck 1, a synthetic resin liquid is flowed into the internal zone of the frame member 4. A resin board 5 of the punch die in the specified shape can be formed with the synthetic resin liquid being solidified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a die for punching a sheet material of an appropriate shape from a plate-shaped body such as a corrugated sheet or a plastic sheet.

[Prior Art] For example, a cardboard box commonly used as a packaging box is assembled from a blank sheet formed by punching out a corrugated pole sheet. This blank sheet is punched out by using an upper mold having a plate-shaped cutting blade and pressing lines fixed in a predetermined shape, and pressing the core upper mold against the corrugated cardboard sheet. The conventional upper mold is a wooden plywood board with a narrow groove extending through it, and a cutting blade or a press line is inserted into the narrow groove and fixed. Such punching dies are used not only for punching paper such as cardboard and cardboard, but also for punching sheet-like materials such as plastic and leather.

[Problem B to be solved by the invention] The narrow grooves in conventional punching dies are cut into a predetermined shape using a sewing machine saw or a laser cutting device, and this work is extremely precise and requires skill. . The cutting blades and markings are fixed by being fitted into the narrow grooves cut in this way, but it is difficult to keep the height of the blades at the same level, and it is necessary to adjust the height level from time to time. Ta. In other words, if there is an error in the height level, there will be parts that cannot be cut, so
This is because the product value is lost. For this reason, adjustment has conventionally been carried out by pasting a tape-like material on the back side of the cutting blade or the back side of the face plate (lower die) where the cutting is defective. However, even if the height was corrected, deviations would still occur in other parts, requiring frequent adjustments. In addition, in order to save the effort of height adjustment, a method of increasing the pressure when punching is adopted, but this method shortens the life of the cutting blade, roughens the cut surface of the product, and severely damages the face plate. there were. Furthermore, if the punching operation is repeated, the inserted portion may become loose and fall out.

On the other hand, in the case of blank sheets for cardboard boxes, etc.
Pressing lines for creating creases are provided along with the cutting blade, but
When the corrugated pole sheet is pressed with this pressed rule, line cracking (the liner of the corrugated board sheet is torn) may occur. Since this problem can be solved by simultaneously crushing the corrugations around the portion of the corrugated board sheet where the pressed line is pressed, protrusions are provided on both sides of the pressed line. Conventionally, the narrow grooves for fitting the pressed lines are also created using a laser cutting device, etc. However, although it is easy to form the narrow grooves using these methods, It was difficult to form a wide groove for fitting the two at the same time. For this reason, the protrusions had to be formed by pasting cork or polypropylene molded products on both sides of the pressed lines fitted into the narrow grooves, which was time-consuming. Also, as a structural problem, IIIj on plywood
When installing the IB, it is necessary to provide connecting parts at appropriate locations so that the part surrounded by the narrow groove does not fall off, and
It was necessary to provide a notch in the cutting edge so as not to interfere with the connecting portion.

[Means for solving the problem] In view of the above points, the present inventors have conducted extensive research and have found that
The present invention has been achieved, and its feature is that it cuts into sheet materials of a predetermined shape in the production of a punching die for punching sheet materials of a predetermined shape from a plate-shaped body. A cutting blade provided with pouring gates at appropriate locations is placed on the surface of a base that forms a magnetic field on the surface in a state in which it is fixed by the magnetic force of the base, and then a frame is fixed around the cutting blade. A synthetic resin liquid is poured onto the surface of the base, which is an internal area of the material, and the synthetic resin liquid is solidified to form a resin board with the cutting blade fixed thereon.

Here, the term "plate-shaped body" as used herein refers to a thin plate-shaped body from which a sheet material to be punched is obtained. This can be, for example, cardboard, cardboard, plastic sheet or leather. Examples of sheet materials to be punched out include blank sheets for cardboard boxes, soles of shoes made of rubber or leather, and various types of plastic stickers. In this case, the plate-shaped body does not refer only to the raw material for obtaining the required sheet material, but also includes cases in which holes or notches of appropriate shapes are provided in the plate-shaped body. In other words, this is a case where a plate-shaped body is required after punching out a sheet material.

The term "substrate" refers to something that has a flat surface and forms a magnetic field on the surface. This is a table-shaped electromagnetic chuck or an electromagnetic chuck used for machining, etc. The magnetic force of this base attracts and fixes cutting blades, stamping lines, etc. to the surface of the base.

In this case, the cutting blade etc. may be fixed directly on the base, but
It is preferable to spread a film sheet or apply a release agent on the surface of the base.

The term "cutting blade" refers to a plate-shaped blade with a punching blade provided at its upper end. Since the lower end of the cutting blade is fixed by being attracted to the surface of the base by the magnetic force of the base, it may be made of any magnetic material. The arrangement of the cutting blade on the substrate surface is not particularly limited, but it is possible to mif a film sheet with a pattern to be placed on the substrate surface and fix the cutting blade along the pattern. is simple and accurate. Alternatively, a patterned iron plate or the like may be placed on the base so that the iron plate or the like can be reused.

After fixing the cutting blade on the base, the synthetic resin liquid is poured,
In order to allow this synthetic resin liquid to flow into each space surrounded by the cutting blade and the pressing rule, pouring gates are provided at appropriate locations between the cutting blade and the pressing rule. Further, by providing the pouring gate, when the synthetic resin liquid solidifies, the parts surrounded by the cutting blades etc. can be made to communicate with each other without being separated. This pouring gate is a hole, notch, or the like provided in a portion of the cutting blade other than the blade portion. The shape is not particularly limited as long as it allows the synthetic resin liquid to flow through it, but it is preferable to have a hole rather than a notch. In other words, if the gate is made into a hole, the strength of the cutting edge itself will be higher than that of a notch, and there will be no vertical warping, so it is possible to prevent the warping that occurs when the synthetic resin liquid that is poured into it contracts when it solidifies. There are advantages. Furthermore, since the contact area of the cutting blade with the base is not reduced, it does not affect fixation on the board surface due to magnetic force, and the cutting blade is resistant to force applied in the direction of removal from the resin board. The cutting blades, etc. are fixed by adhering them to the surface of the base using the magnetic force of the base as described above, but it is also possible to use a support or a separator (to maintain the spacing between the cutting blades) to be fixed on the base. .

The "synthetic resin liquid" may be any resin that has fluidity and solidifies after a certain period of time, and is not particularly limited, but a resin with a small shrinkage rate is preferable. Examples of the resin used in the present invention include epoxy and urethane resins. Furthermore, aggregate or the like may be added to these resins.

This synthetic resin liquid is poured into the area surrounded by the frame material on the base to which the cutting blade etc. are fixed to form a resin board to which the cutting blade etc. are fixed. This resin board is a punching die, and when it is attached to a punching device, a sheet material is punched out from the plate-shaped body. The frame material provided around the cutting blade may be attracted by the magnetic force of the base, or may be fixed with an adhesive or the like on a base without a magnetic field. In addition, this frame material may be one that is fixedly provided around the cutting blade, etc., so for example, a magnetic tray (having an edge corresponding to the height of the frame material around it) may be used as a base material. The tray may be placed on the surface and a cutting blade or the like may be fixed within the tray. By using such a tray, iron plate, etc., it is possible to remove the synthetic resin liquid from the base once it has initially hardened, and it is also possible to solidify it in another location. Therefore, the base can be used effectively.

The synthetic resin liquid is filled over the entirety of the internal area surrounded by the frame material, but it is preferable to provide a portion where no cutting blade or the like is present where the synthetic resin liquid is not filled.

This is done by separately fixing a mold to a part of the base where there are no cutting blades, etc., and then pouring a synthetic resin liquid into the solidified resin board to form a window hole.

[Embodiments] Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

FIG. 1 shows an example of the method of the present invention, in which a cutting blade 2 and a press rule 3 are magnetically attracted and fixed on the plate surface of an electromagnetic chuck 1. The arrangement pattern of the cutting blades 2 and the like is for punching out a blank sheet to be assembled into an A-type cardboard box. A frame member 4 surrounding the cutting blade 2 and fixed to the upper surface of the electromagnetic chuck 1 is also fixed by the magnetic force of the electromagnetic chuck 1. The internal dimensions of the frame material 4 determine the size of the resin board 5 to be manufactured, and the attachment of the punching die of the punching device fixes the frame material 4 in accordance with the size of the part. In this way, the cutting blade 2 is placed on the plate surface of the electromagnetic chuck 1.
After fixing the frame material 4, etc., a synthetic resin liquid 11 is poured into the internal area of the frame material 4 (FIG. 2). Cutting edge 2 shown in this example
The thickness is about 1+n and the height is about 248. The pressed line 3 has a thickness of approximately 1.5 squares and a height of approximately 23 squares. Further, the hole 6, which is a pouring gate provided in the cutting blade 2 and the press rule 3, has a diameter of 10 fi, and the synthetic resin liquid 11 is poured in to a thickness of about 16 mm.

When the synthetic resin liquid 11 is solidified in this manner, a resin board 5 as shown in FIG. 3 is formed.

FIG. 4 shows another example of the method of the present invention, in which a film sheet 7 is laid on the electromagnetic chuck 1, and the film sheet 7 is
This is a method of fixing the cutting blade 2 etc. on top using magnetic force. This film sheet 7 is used for the purpose of facilitating the peeling of the formed resin board 5 and protecting the electromagnetic chuck 1, but in this example, a pattern in which the cutting blade 2 etc. should be arranged is drawn. A film sheet 7 is used to facilitate the arrangement of the cutting blade 2 and the like.

FIG. 5 shows another example of supporting and fixing the cutting blade 2 (hereinafter, the case of the press line 3 is also included) on the electromagnetic chuck 1, in which the cutting blade 2 is fixed using a support 8. This is what I did. In the method of the present invention, it is sufficient to fix the cutting blade 2 bent according to the pattern on the board surface using the magnetic force of the electromagnetic chuck 1, but the support 8 is also used to ensure the fixation. be. This support 8 is made by cutting an aluminum angle into a length of about 2 cm, and is fixed at appropriate locations on both sides of the cutting blade 2. Although double-sided adhesive tape is used to fix this, it may also be made of a magnetic material such as iron and fixed by the magnetic force of the electromagnetic chuck 1.

Further, as shown in FIG. 6, it may be fixed with a separator 9. This separator 9 maintains the distance between the cutting blades 2, and is provided so as to span the opposing cutting blades 2. The separator 9 itself does not need to be fixed to the plate surface of the electromagnetic chuck 1.

FIG. 7 shows another example of the resin board 5, in which a window hole 10 is formed in a portion where the cutting edge 2 is not present. This window hole 10 is formed by fixing a mold on the plate surface of the electromagnetic chuck 1 when pouring the synthetic resin liquid 11, and removing the mold when it hardens. is not particularly limited.

[Effects of the Invention] As described above, the method for manufacturing a punching die according to the present invention has various extremely excellent effects as described below.

■ Cutting blades, etc. that must be supported and fixed when pouring synthetic resin liquid can be easily and securely fixed.

■ Even if twisting occurs when the cutting blade is bent, the twisting can be corrected by attracting it onto the board surface using the magnetic force of the base, so the height of the blade can be maintained at a constant level.

■ The height of the blade can be kept constant and securely fixed, eliminating the need for time-consuming height adjustment.

■ Since the height of the blade can be kept constant and securely fixed, the pressure applied when punching sheet material can be reduced to about half of that of conventional methods, extending the life of the blade. ).

■ Wide ruled lines with integrated protrusions to prevent line cracking can also be embedded and fixed in the resin board in the same way as the cutting blades, eliminating the need for pasting cork, etc. as required in the past.

■ By laying a film sheet on the base, the formed resin board can be easily peeled off.

(2) If a pattern for arranging cutting blades etc. is drawn on the film sheet, the cutting blades etc. can be placed precisely and easily.

(2) If a hole is provided in the cutting blade or the like as a pouring gate, the cutting blade will not warp in the height direction, and warping due to shrinkage when the synthetic resin liquid hardens can be prevented.

■ By forming window holes in the resin board, the amount of shrinkage when the synthetic resin liquid hardens will be reduced, and the shrinkage will occur smoothly, reducing distortion and reducing weight. .

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the state in which the cutting blade etc. are fixed on the plate surface of the electromagnetic chuck, Figure 2 is a partial end view showing the state in which synthetic resin liquid is poured into the thing shown in Figure 1, and Figure 3. The figure is a perspective view showing an example of a formed resin board, Figure 4 is a side view showing a state in which a film sheet is spread on the board surface of the electromagnetic chuck and the cutting blade etc. are fixed, and Figures 5 and 6 are respectively FIG. 7 is a partial cross-sectional view showing another example of fixing the cutting blade, and FIG. 7 is a plan view showing another example of the resin board. 1... Electromagnetic chuck 3... Pressing line 5... Resin board 7... Film sheet 9... Separator 2... Cutting blade 4-... Frame material 6... Hole 8...・Support 10...Window hole 11...Synthetic resin liquid patent applicant Yamato Shiki Co., Ltd. Figure 6 #F7th

Claims (1)

[Scope of Claims] 1. In manufacturing a punching die for punching sheet materials of a predetermined shape from a plate-shaped body, the punching die is for cutting into sheet materials of a predetermined shape, and pouring gates are provided at appropriate locations. After the cutting blade is placed on the surface of the base that forms a magnetic field on the surface in a state in which it is fixed by the magnetic force of the base, the internal area of the frame material fixed around the cutting blade and the surface of the base 1. A method for manufacturing a punching die, characterized in that a synthetic resin liquid is poured onto the die and the synthetic resin liquid is solidified to form a resin board with the cutting blade fixed thereon. 2. A method for manufacturing a punching die according to claim 1, wherein a film sheet is placed on the surface of a base. 3. The method for manufacturing a punching die according to claim 1, wherein the pouring gate is formed by a hole. 4. The method for manufacturing a punching die according to claim 1, wherein the resin board is provided with window holes at appropriate locations where no cutting edge is present.