JP4019394B2 - Punching die and its manufacturing method - Google Patents

Description

  The present invention relates to a punching die for punching a sheet-like material such as a plastic sheet or a corrugated cardboard sheet into a desired shape, and a method for manufacturing the punching die.

A conventional punching die will be described with reference to the drawings.
FIG. 7 is a perspective view showing a conventional punching die, and FIG. 8A is an enlarged sectional view taken along lines Y and Y in FIG. 7 when a narrow groove is formed using a laser beam. FIG. 8B is an enlarged sectional view taken along lines Y and Y in FIG. 7 when a narrow groove is formed using an end mill and a wire. Conventionally, as a punching die for punching a sheet-like material such as a plastic sheet or a corrugated cardboard sheet into a desired shape, a plate-like body (referred to as “base material” in the present specification), for example, a veneer board, etc. A narrow groove 6 is provided through a base material 2 made of a wooden plywood, a plastic plate, or a metal plate, and a cutting blade (big blade) 1 is fitted and fixed in the narrow groove 6 (patent) Reference 1). Reference numeral 19 denotes a cutting edge of the cutting blade 1. As a means for forming the narrow groove 6 in the base material 2, a thread saw or the like has been conventionally used. However, in recent years, a laser cutting method using a laser beam, an end mill cutting method using an end mill, a wire cutting method using a wire, and the like have been adopted. ing.

The narrow groove formed in the base material by the above-described yarn saw, laser beam, end mill, wire or the like was formed to be slightly wider than the thickness of the cutting blade 1 in order to fit the cutting blade 1. Therefore, it was found that when the cutting blade 1 was fitted and fixed in such a narrow groove 6, the cutting blade was loosened while many sheets were punched. In particular, it has been found that the tendency is large in the portion of the short cutting blade 20, particularly in the portion of the straight and short cutting blade 20. Further, when the narrow groove 6 is formed in the base material 2 using a laser beam, the width of the narrow groove 6 at the center of the base material 2 is narrow on the front side and the back side as shown in FIG. Since it is wider than the width of the groove 6, the cutting blade is fixed at the front surface side portion and the back surface side portion of the base material 2, which is more susceptible to the influence. Further, as shown in FIG. 8 (b), when the cutting blade 1 is fitted and fixed in the narrow groove 6, the same applies to the case where the width of the narrow groove 6 is slightly widened to facilitate the operation. There was a problem.
As described above, a punching die obtained by forming a narrow groove in a base material using a yarn saw or a laser beam and inserting and fixing a cutting blade in the narrow groove is used for punching a corrugated cardboard sheet or the like. In some cases, the above facts were not a problem because there was no requirement for such accuracy. However, when punching sheet-like materials that require highly accurate punching, such as plastic sheets used in electronic parts, etc., the cutting blade is loosened while fixing many blades at high speed. It became clear that it became a big problem that it was impossible to punch properly.

JP-A-6-226482 (FIG. 3 on page 4 and FIG. 4 on page 3)

  Therefore, the present invention is a punching die of a type in which a narrow groove is formed in a base material using an end mill or the like, and a cutting blade is fitted and fixed in the narrow groove, and a plurality of sheet-like objects can be punched at high speed. It is an object of the present invention to provide a punching die that can be punched accurately without loosening of the cutting blade.

The present inventor has made it possible to solve the above problems by adopting the following configuration.
(1) A thick groove along the narrow groove having a narrow groove formed in a desired shape and surrounding the periphery of the cutting blade in at least one of two base materials in which the cutting blade is fitted. The resin filling chamber in which the resin filling chamber is formed, the resin introduction hole communicating with the resin filling chamber, and the hole that acts as a resin outflow and deaeration are formed, and the resin filling chamber is filled and solidified with fluid resin. Punching die characterized by
(2) The cutting die according to (1), wherein the cutting blade is provided with a concave portion or a through hole in a portion in contact with the resin.
(3) The punching die according to (1) or (2), wherein the narrow groove is formed by any one of a laser beam, an end mill, and a wire.
(4) A method of manufacturing a punching die according to any one of (1) to (3), wherein a narrow groove is formed in a desired shape, and a cutting blade is fitted into the narrow groove. A resin filling chamber in which at least one of the base material is formed with a thick groove along the narrow groove that surrounds the periphery of the cutting blade, a resin introduction hole communicating with the resin filling chamber, and a resin outflow and deaeration A method for producing a punching die comprising forming a hole acting as a filler, filling the resin filling chamber with a fluid resin, and solidifying the resin.
(5) The method for producing a die according to (4), wherein the resin is filled and solidified in a state where the die is pressed between upper and lower press surface plates.
The shape of the resin filling chamber “enclosing the cutting blade” includes a shape surrounding both sides of the cutting blade as shown in FIGS. 5 (a) and 5 (b), as well as a cutting blade as shown in FIG. 5 (c). A shape that surrounds one side is also included.

In the punching die of the present invention, a narrow groove is formed in a desired shape, and a resin filling chamber is formed so as to surround the cutting blade by two base materials in which the cutting blade is fitted in the thin groove. The fluid filling resin is filled and solidified in the resin filling chamber, so that the cutting blade is accurately fixed in a desired shape, and even when a large number of sheet-like materials are punched out, it can be punched out accurately. There is an excellent effect that it becomes possible.
Moreover, as a cutting blade, by using a cutting blade having at least one recess or through hole in a portion that comes into contact with the resin, the cutting blade can be more accurately and firmly fixed to the base material in a desired shape. It becomes possible.
Furthermore, by filling and solidifying the resin in a state where it is pressed between the upper and lower press surface plates, the cutting edge of the cutting blade is fixed in a horizontally aligned state, and more accurate punching becomes possible.

The present invention is a punch of a type in which a cutting blade is fitted into a narrow groove of a base material in which a narrow groove is formed in a desired shape, and the cutting die of the present invention accurately connects the cutting blade to the base material, This is a die that is fixed so that the cutting blade does not loosen even if a large number of sheet-like materials are punched out.
The base material of the punching die of the present invention may be a plate-like body formed of any material, but a plate-like body formed of a synthetic resin is preferable. Examples of the synthetic resin include acrylic resin, PET (polyethylene terephthalate), and vinyl chloride resin.
A plate-like body in which several wooden plate-like bodies or thin wooden sheet-like materials are laminated, for example, a veneer board may be used.
Further, when punching a large number of sheets or punching a slightly hard material, a thin metal plate-like body can be used.
Since two plate-like bodies are used, they may not be so thick, and may have a thickness of about 6 to 8 mm.
It should be noted that any of the cutting dies of the present invention can be widely applied by adjusting the thickness of the base material, from a cutting die using a high cutting blade to a cutting die using a low cutting blade. is there.

  The narrow groove can be formed on the plate-like body by any known method, but it is preferably performed by end milling using a machining machine. As shown in FIG. 8B, when the cutting blade 1 is fitted and fixed in the narrow groove 6, the present invention is used when the width of the narrow groove 6 is slightly widened in order to facilitate the operation. This effect is particularly remarkable.

As the cutting blade fitted into the narrow groove of the plate-like body, a cutting blade usually used for this type of punching die can be used. The cutting blade is a metallic, thin and elongated band-like body having a blade portion formed on one side in the length direction, cut into an appropriate length, used in a straight line shape or after being bent. .
In order to improve the integration with the cutting blade and resin and prevent relative displacement between them, it is located between the two base materials under the cutting blade portion of the cutting blade. It is preferable that at least one recess or through hole is provided in the portion (that is, the portion in contact with the resin).

The resin filling chamber and the resin introduction hole communicating with the resin filling chamber are formed in at least one of the two base materials, and the two base materials are like screws and nails with the cutting blades fitted. It is fixed with an appropriate fixing material or adhesive. In order to fix more accurately, positioning holes may be provided in the respective base materials, and positioning pins may be inserted and fixed therein.
The resin introduction hole is a hole for filling the resin, and at least one is provided. The height of the resin filling chamber and the resin introduction hole is preferably narrow, but considering the fluidity of the resin to be filled, it is 4 to 8 mm, preferably about 6 mm. Of course, when resin with good fluidity is used as the resin to be filled, it can be 4 mm or less.

  The resin filled in the resin filling chamber can be either a thermoplastic or thermosetting resin. Specifically, examples of the resin filled in the resin filling chamber include an epoxy resin and a urethane resin phenol. Resins, melamine resins, polyimide resins, silicone resins and the like can be mentioned.

In the following, the punching die of the present invention will be described in detail with reference to the drawings. Of course, the present invention is not limited to the following description.
FIG. 1 is a view showing a sheet-like material punched by the punching die of the present invention, and FIG. 2 is a cutting blade (recessed portion) in a state of being arranged in a desired shape before being fitted into the punching die of the present invention. 3 is a perspective view showing the punching die of the present invention, FIG. 4 (a) is a perspective view of the lower base material 3, and FIG. FIG. 5A is a perspective view of the upper base material 2 turned upside down, and FIG. 5A is a cross-sectional view taken along lines X and X in FIG. 3. FIGS. 5B and 5C are cross-sectional views of an example in which the resin filling chamber has another shape.

3 to 5, reference numerals 2 and 3 denote base materials, and the base material is formed into narrow grooves 6 formed by end mills or the like corresponding to the shape of a desired sheet A as shown in FIG. A cutting blade 1 having a shape as shown in FIG. 2 is fitted. Forms that surround the periphery of the cutting blade 1 in the two base materials 2 and 3, for example, as shown in FIGS. 4 (a) and 4 (b), thick grooves along the narrow grooves 6 are respectively formed. As a result, the resin filling chamber 4 is formed. At least one of the base materials 2 and 3 is provided with at least one hole 7 for filling the fluid resin 5. In addition, a hole 7 'can be provided to act as a resin outflow and deaeration. The fluid resin is filled in the resin filling chamber, degassed, and then cured by the action of the contained curing agent. As shown in FIG. 4, the resin filling chamber 4 preferably has a groove shape along the cutting blade. This is because the amount of the resin to be used is small and the influence of the resin shrinkage is small. Furthermore, this shape is preferable also in that the strength of the inner portion of the narrow groove 6 of the base material 2 before the cutting blade 1 is fitted is higher than the shape in which the inside of the narrow groove 6 is made hollow as a resin filling chamber. If there is a cavity in the resin filling chamber under the entire inner portion of the narrow groove 6 of the base material 2, the inner portion of the narrow groove 6 of the base material 2 may be depressed or the bridge may be broken before the cutting blade 1 is fitted. However, there is very little possibility that this will occur if the resin filling chamber has a shape as shown in FIG. Further, when the cutting blade 1 is fitted, the inner portion of the narrow groove 6 of the base material 2 is difficult to move, and the cutting blade 1 can be fitted while maintaining the levelness, and the cutting edge dimension can be highly accurate.
By using a cutting blade having at least one recess or through hole in the portion that comes into contact with the resin as the cutting blade, the cutting blade and the resin are firmly integrated and fixed. It becomes possible to fix the shape more accurately and firmly. Further, by adopting such a structure, the cutting blade can be accurately and firmly fixed to a desired shape with respect to the base material even if the fluid resin is somewhat contractible.

The punching die of the present invention may be manufactured by any method. For example, two base materials in which a narrow groove, a resin filling chamber and a thick groove serving as a resin introduction hole are formed in a desired shape are prepared. Manufactured by fitting a cutting blade into two narrow grooves on the base material with thick grooved surfaces and fixing to form a resin filling chamber, filling the resin filling chamber with fluid resin, and solidifying can do.
Further, as shown in FIG. 6 (a), the cutting die 8 is disposed between the upper and lower press surface plates 9, 10, and the height of the cutting blade 1 is increased by the press surface plates 9, 10 as shown in FIG. 6 (b). It is preferable that the resin filling chamber is filled with a fluid resin and solidified while being pressed at the same interval as the length a. By doing in this way, it is because the cutting edge of the cutting blade 1 at the time of resin filling and solidification can be prevented from being shaken, and fixing with the resin is performed in a state where the cutting edges are aligned horizontally.

It is a figure which shows the sheet-like thing punched by an example of the punching die of this invention. It is a perspective view which shows the cutting blade (example of what has a recessed part) of the state arrange | positioned in the desired shape before being inserted in the punching die of this invention. It is a perspective view which shows an example of the cutting die of this invention. (A), (b) is a perspective view which shows two base materials which comprise the punching die shown in FIG. (A) is the cut surface figure in the X, X-ray of FIG. 3, (b) And (c) is a cut surface figure which shows another example which changed the shape of the resin filling chamber. (A) is a perspective view which shows the state of the cutting die before performing the press for resin filling, (b) is a perspective view which shows the state filled with resin, pressing. It is a perspective view which shows the conventional punching die. (A), (b) is an expanded sectional view in the Y and Y line | wire of FIG.

Explanation of symbols

1, 1 'cutting blade 2, 3 base material 4 resin filling chamber 5 resin 6, 6' narrow groove 7 resin introduction hole 7 'deaeration and resin outflow hole 8 punching die 9 upper press surface plate 10 lower press surface plate

Claims (5)

  A narrow groove is formed in a desired shape, and a thick groove along the narrow groove is formed on at least one of the two base materials into which the cutting blade is fitted. The resin filling chamber, the resin introduction hole communicating with the resin filling chamber, and the hole acting as a resin outflow and deaeration are formed, and the resin filling chamber is filled with a fluid resin and solidified. A punching die.   The punching die according to claim 1, wherein the cutting blade is provided with a recess or a through hole in a portion in contact with the resin.   The punching die according to claim 1 or 2, wherein the narrow groove is formed by any one of a laser beam, an end mill, and a wire. It is a manufacturing method of the die according to any one of claims 1 to 3,
A narrow groove is formed in a desired shape, and a thick groove along the narrow groove is formed on at least one of the two base materials into which the cutting blade is fitted. The resin filling chamber, the resin introduction hole communicating with the resin filling chamber, and the hole acting as a resin outflow and deaeration are formed, and the resin filling chamber is filled with a fluid resin and solidified. Manufacturing method of punching dies.   The method for producing a punching die according to claim 4, wherein the filling and solidification of the resin is performed in a state where the punching die is pressed between upper and lower press surface plates.

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