JPH08257995A - Steel rule die - Google Patents

Abstract

PURPOSE: To surely prevent blades from dropping by bonding the lower surfaces of rubber blocks to an upper steel plate and the side faces of the blocks to the side faces of a blade or a ruling blade, in a trimming die for use in a plate punch. CONSTITUTION: In a trimming die for punching a case of a VCR cassette and the like made of a plastic sheet, steel plates 14, 15 are bonded to the upper and lower surfaces of plywood 1, and are fixed integral with each other using screws 17.... The plywood 1 and the upper and lower steel plates 14, 15 are cut at the required parts by laser beams so that a blade 11 and a ruling blade 12 can be placed lengthwise and crosswise, and the blade 11 and the ruling blade 12 are fitted into a variety of oblong holes formed. In order to prevent the blade 11 and the ruling blade 12 from dropping, rubber blocks 16, 16 are bonded to the side walls of the blade 11 and the ruling blade 12 and to the upper surface of the steel plate 14 with a rubber type adhesive.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die and a female die used in a flat plate punching machine in manufacturing a paper container or a plastic box. In particular, it relates to a steel rule die in which two metal plates obtained by cutting a metal plate with a laser beam are embedded, and a female die in which a metal plate is also cut with a laser beam.

[Prior Art] Conventionally, a steel rule die used for a flat plate punching machine is a 0.7 mm wide groove formed by cutting an 18 mm plywood with an NC device equipped with a carbon dioxide gas laser beam. The bent blade had the same thickness, and the ruled blade was inserted. For example, there is USP3036478. However, due to problems such as accuracy and durability, steel rule dies composed of two metal plates above and below are provided instead of plywood. For example USP3863550, US
P4052886, USP5022955. US
P3863550 is obtained by cutting a 0.7 mm groove on two upper and lower 1 mm thick steel plates by a corrosion technique.
To accurately cut a groove on a 1 mm steel plate with a width of 0.7 mm, apply a photo register on both sides of the steel plate, put a negative film of a pattern on it, expose it, and corrode it in a corrosion tank to cut the groove. is there. This is a technique suitable for mass-produced products such as shadow masks for cathode ray tubes. It is not suitable for single product such as die-cutting. It also requires expensive capital investment. USP4052886, USP5022955
Has proposed a method of cutting a groove in a steel sheet with a laser beam or milling. However, considering productivity, milling cuts a groove of 0.7 mm for a plate thickness of 1 mm, so it is accurate but much slower than a laser. The laser beam is optimal. However, the problem of these three is that the blade, especially the straight blade, is easily removed. So USP3
863550 and USP3863550 are SEMI-RI.
GID (semi-hard) material such as epoxy resin is poured and fixed. USP 5029505 is a method of fixing by ball bearing. This method is not possible with short straight blades. USP3036478 is not suitable for blade replacement because it is a method of fixing a nail from a hole opened on the back. In addition, these prior known techniques are plastic sheets,
For example, it is not suitable for a VCR cassette case made of PP (polypropylene) sheet. It is known that the steel rule die itself should be heated by a hot plate from the backside for punching, but the plywood is carbonized and the die life is short. Therefore, in order to punch out these plastic sheets, only the outer shape is normal steel rule
In order to form a sharp broken line by punching with a die, the high-frequency welder type press machine is used to heat-form the ruled line.

[Problems to be Solved by the Invention] The present invention is a steel with high precision and high strength capable of preventing the blade from falling off.
Providing a rule die. It also aims to provide heat-resistant steel rule dies. It is also to provide a female mold with high precision and durability.

[Means for Solving the Problem] As a means for preventing the blade from falling off, the side wall of the blade and the upper steel plate are fixed with a rubber block. Alternatively, a part of the blade is cut and the blade is inserted into the upper steel plate and then twisted on the lower surface of the steel plate to prevent the blade from falling off. Further, by connecting two steel plates with a metallic spacer and inserting a heater in the hollow, heating can be performed with good thermal efficiency. Laser-cut stainless steel sheet is attached to another plate to provide a precise and durable female die.

[Operation] The punching die and the female die of the present invention are set in a flat plate punching machine and punched. In the case of punching a paperboard, a normal use method may be used. When punching out a plastic sheet, a heater is inserted into the hollow portion 21 for use. When using the punching die and the female die of the present invention as a set, the ruled line blade 12
The blades 11 have the same height.

[Embodiment] The first embodiment of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a developed plan view of a punching design for punching a case of a VCR cassette. Generally, 18 mm plywood 1 is cut by an NC device with a laser beam. The part of the blade is the solid line 11,
The part of the ruled line blade 12 is a broken line. The bridges 13 are connected so that the plywood 1 is not cut apart when cut by a laser beam. However, when punching board or plastic with a punch, the cutting edge wears. 100,000 to 200,000 shots when punching waste paper as in Japan, and 100 when punching virgin pulp paperboard as in Western countries.
You have to change the blade every ten thousand shots. If the blade is replaced several times, the groove cut by the laser becomes loose and it becomes unusable. Therefore, the above-mentioned UPS3863550 is USP405 by Atlas Die as "Bonded Die".
2886, and USP 5029505 are reinforced by metal plates as "Never Die Die" by Southeastern Die Co., Ltd. SEMI-RIGID to prevent the blade from falling in the groove.
A steel rule die that can withstand blade replacement with a (semi-hard) plastic or ball bearing has been proposed. FIG. 2 shows an embodiment of the present invention, which is shown in FIG.
It is sectional drawing of the part enclosed with the circle. 15 mm plywood 1
Is cut with a laser beam, and two pieces of 1.5 mm stainless steel (SUS304) are similarly cut with a laser beam. To connect and fix the upper steel plate 14 and the lower steel plate 15 to each other, a tap hole 171 is provided in the upper steel plate 14 and a counterbore hole 172 is provided in the lower steel plate 15, and they are fixed with a screw 17 having a diameter of 4 mm. A blade 11 is provided on the upper surface of the upper steel plate 14.
And a rubber block 16 to prevent the ruled line blade 12 from falling off.
Is a rubber adhesive and the side wall of the blade 11, the ruled line blade 12 and the steel plate 1
The upper surface of 4 is adhesively fixed. In general, long blades and bent blades rarely fall off, but straight short blades and ruled line blades easily fall off. Rubber block 161 glued to the blade
May be higher than the blade 11 by about 3 mm in order to discharge the punched material. The effect of preventing falling and the effect of material discharge can be combined. A method of welding the blade 11 and the upper steel plate 14 to the falling of the blade 11 can be considered, but if this is done, the "PATCH UP" work cannot be performed.
"Muratori" is a work to remove the "unevenness" of the blade height. FIG. 3 shows another embodiment. If the material to be punched out is a plastic sheet, it is impossible to form a sharp ruled line with a ruled blade with a normal punching die. Therefore, in FIG. 1, only the part of the blade 11 is punched out, and the part of the ruled line blade 12 is formed by heating with a high-frequency fusing machine which is separately processed to form a sharp ruled line. Recently, PET resin sheets have been widely used for clear packages and the like. In that case, it is known that the life of the blade becomes extremely long by heating even the portion of the blade 11. Therefore, a heating plate may be installed on the back of the punching die. A temperature of about 200 degrees C must be heated. If you do not heat 200 degrees C, the cutting edge will not reach 50 degrees C. The reason why the temperature must be 200 ° C is that the plywood acts as a heat insulating material and heat is not efficiently transmitted to the cutting edge. As a result, the plywood is carbonized and the life of the die is short. A pipe-shaped spacer 2 having an outer diameter of 10 mm and a height of 15 mm is fixed to the upper steel plate 14 cut by the laser beam with a screw 17 having a diameter of 4 mm. Thereby, the hollow portion 21 capable of accommodating the heater can be formed. When a heater is passed through the blade 11 and the ruled line 12, for example, by opening a nick for passing a heater having a diameter of 8 mm, hot air flows in and out of the hollow portion and the heating is averaged. The short straight blade 11 and the ruled blade 12 make a notch 3 like the right end of the blade 11 in FIG. When the blade 11 and the ruled line blade 12 have the nick 31 corresponding to the bridge 13, the cut 3 may be once straightened with the anvil and the hammer, and then inserted from above and twisted with pliers. The notch 3 can be easily formed by a tool for forming a zipper on the blade 11. At the left end of the blade 11 in FIG. 4, there is a notch 3 formed by a grinder instead of the notch 3. By inserting the stopper 32 into the cut 3, it is possible to prevent the blade 11 from falling off. In the present invention, the upper and lower steel plates 14 and 15 are shown as an example of stainless steel having a thickness of 1.5 mm, but any metal plate may be used. Further, the thickness is not limited to 1.5 mm. In FIG. 5, the nick 31 has a special shape. The cutting width of the blade bottom is 3 mm, and the upper part is 7 mm. The upper steel plate 14 has a 3 mm bridge 13 corresponding to the blade bottom. After inserting the blade 11, the stopper 32 is attached to the nick 3 from the back surface of the upper steel plate 14.
Insert at the top of 1. This allows the blade 1 from the upper steel plate 14
1 cannot be missed. The VCR polypropylene cassette case is formed by heating and melting the ruled line in a separate process. In the die of the present invention, since the heater can be housed in the hollow portion 21 and heated, the punching of the outer shape blade 11 and the heating and melting of the ruled line 12 can be performed at the same time, which improves the productivity. FIG. 6 shows the relationship between the conventional die and the female die of the "bonded die". Conventionally, as in USP 4256026, the blade 11 is lower than the ruled line 12 by the thickness of the material 5, forming a hinge in the material 5. However, in the "bonded die", the blade 11 and the ruled line blade 12 have the same height. When it is stuck on the face plate like the female type of USP 4256026, the end portion must be inclined, but the "bonded die" is not necessary. And directly on the face plate 4,
The groove 41 corresponding to the ruled line blade 12 is cut. However, it is very difficult to form the female groove 41. Because, when punching, the blade 1 with a shower hardness of 70 degrees
The hardness of the face plate 4 on which 1 hits is 8
0 degrees. Since it is difficult to cut this hardness by milling, the face plate 4 is directly cut by corrosion as shown in FIG. A thin, about 1 mm stainless steel SUS304 may be used on the face plate 4 to cut grooves 41 in it. SUS304 has a Shore hardness of 30 degrees, but since it is viscous, it can withstand a blade edge of 70 degrees. Even in that case, the milling must be repeated by changing the milling drill.
The female die of the present invention uses SUS304 stainless steel, and adopts cutting with a laser beam having high machining productivity of the groove 41. However, it cannot be cut with a laser beam leaving the bottom as shown in FIG. Therefore, according to the present invention, as shown in FIG. 7, the stainless steel 4 of SUS304 having the same thickness as the board having the double-sided adhesive 44 adhered to the back surface is used.
The groove 41 corresponding to the ruled line blade 12 is cut. Then, it is adhesively fixed to another steel plate 45. It is cheaper and faster to manufacture than milling and corrosion. Since a laser beam can be cut regardless of hardness, a shovel 80-degree steel plate may be used as long as it has a cost. FIG. 8 shows one method of fixing the female die of the present invention to the steel plate 45. USP4
It is the same method as 5256026. The steel plate 45 is fixed to the lower fixed tank 42 of the punching machine together with the face plate 4 with screws. In this state, the female die 43 of the present invention set by the pin 6 is transferred to the die on the upper part of the punching machine. In this case steel plate 45
It is also possible to omit the step and directly transfer to the face plate 4. FIG. 9 shows another embodiment. A drill hole 111 is formed in the bottom of the groove of the cutting blade 11 cut in the punched plywood 1. The depth may be about 5 mm. The notch 3 of the blade 11 can be inserted from the back side when there is no bridge. If there is a bridge, the cut 3 is returned to its original state and is inserted from the surface.

[Advantages of the Invention] Since the present invention has the above-described structure, (A) the rubber block 16 prevents the blade 11 and the ruled line blade 12 from falling out of the die. Since the rubber block 16 has flexibility, it has no influence on the "uniformity" work of the blade 11. (B) The rubber block 161 not only prevents the blade 11 from falling out of the die, but can also discharge the punched material. (C) When punching a plastic sheet by heating a blade 1 and a ruled line blade 12 by inserting a heater into a hollow portion 21 formed by fixing two upper and lower steel plates 14 and 15 with a spacer 2. Not only can the life of the blade 11 be extended, but a sharp broken line can be obtained by one punching. (D) The notch 3 on the side wall of the blade 11 and the ruled line blade 12 is the blade 1
1. Prevent the ruled line blade 12 from falling off. (E) By cutting the stainless steel with a laser beam, a high hardness female die can be produced inexpensively and quickly.

[Brief description of drawings]

FIG. 1 is a plan view of a conventional punching die.

FIG. 2 is a sectional view of a circled portion of A of FIG.

FIG. 3 is a cross-sectional view of a circled portion of A of FIG.

FIG. 4 is a perspective view of an embodiment of the present invention.

FIG. 5 is a perspective view of an embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional “bonded die” die and female die.

FIG. 7 is a sectional view of a female die according to one embodiment of the present invention.

FIG. 8 is a sectional view showing a method of setting a female die according to one embodiment of the present invention.

FIG. 9 is a perspective view of a die according to one embodiment of the present invention.

[Explanation of symbols]

1; Plywood, 11: Blade, 111: Hole, 12: Ruled blade, 1
3; bridge, 14: upper steel plate, 15: lower steel plate, 1
6: rubber block, 161; protruding rubber block, 17;
Screw, 171; Tap hole, 172: Counterbore hole, 2; Spacer, 3: Notch, 31: Nick, 32: Stopper, 4: Face plate, 41: Groove, 42: Shimozane, 44; Double-sided adhesive, 45; Steel plate , 5; material,

Claims (4)

[Claims] 1. The lower surface of the rubber block 16 is an upper steel plate 14
In addition, the die is characterized in that the side surface is adhered to the blade 11 or the ruled line to the side surface of 12. 2. A die which is provided with a hollow portion 21 in which upper and lower steel plates 14 and 15 are fixed by a spacer 2 so as to accommodate a heater. 3. The die according to claim 2, wherein the side wall of the blade 11 or the ruled line blade 12 is provided with a notch 3. 4. A stainless steel 43 and a ruled blade 12
The groove 41 corresponding to the
Female type fixed to 5.