JP6058850B1 - Punching mold - Google Patents

Abstract

There is provided a punching die capable of suppressing a difference in height between adjacent blade edges even when sheet material punching is repeated. A punching die is bent so as to form a two-dimensional shape with a band-shaped blade 311 and a part of the ring-shaped part missing. Is provided with a belt-like blade 312 abutting against the belt-like blade 311, and in a region where the belt-like blade 311 and the belt-like blade 312 are in contact with each other, a protrusion 311 b is provided on the belt-like blade 311 side, and a protrusion is provided on the belt-like blade 312 side. Notches 312b that can be engaged with the portions 311b are provided. By engaging the notch 312b with the protrusion 311b and connecting the strip blade 312 to the strip blade 311, the movement of the strip blade 312 with respect to the strip blade 311 in the height direction can be restricted. [Selection] Figure 4

Description

  The present invention relates to a punching die for cutting a sheet material used for a tray made of synthetic resin or the like.

  Synthetic resin trays, paper boxes, cardboard boxes and the like are manufactured by cutting a sheet material, which is a material, with a punching die (see, for example, Patent Document 1).

  As described in Patent Document 1, the punching die is a belt in which a strip-shaped Thomson blade (hereinafter referred to as “band-shaped blade”) bent into a planar shape to be punched is fixed to a base. Usually, since a plurality of products are punched from one sheet material, strip-shaped blades are arranged on the punching die so as to form a plurality of identical planar shapes.

  Also, instead of arranging two identical band-shaped blades, a part of one of the band-shaped blades is shared between two adjacent band-shaped blades, and there is no gap between the punched products, thereby suppressing waste of material. Has been done. FIG. 11 is a perspective view showing a configuration of a conventional punching die, and FIG. 12 is an exploded perspective view thereof. As shown in FIG. 11, in order to punch two products, the band-shaped blades are arranged so as to form two closed spaces 100 and 200. One band-shaped blade 10 is formed in an annular shape so as to form a closed space 100, and the band-shaped blade 20 adjacent to the band-shaped blade 10 is formed in a two-dimensional shape with a part missing, and two end portions 22 sandwiching the missing part. Is brought into contact with the belt-like blade 10 forming the closed space 100, and a closed space 200 having the same shape as the closed space 100 is formed (see FIG. 11).

JP 2012-71373 A

  In the conventional punching die as described above, when the punching process of the sheet material is repeated, the cutting edge of the band-shaped blade 20 is unstable, so that the height of the cutting edge of the band-shaped blade 10 and the band-shaped blade 20 is different. There is. Thus, when a difference arises in the height of the blade edge | tip of the strip shaped blade 10 and the strip shaped blade 20, the problem that it becomes easy to generate | occur | produce a cutting defect when cut | disconnecting a sheet material will arise.

  This invention is made | formed in view of such a situation, The main objective is to provide the punching die which can solve the said subject.

In order to solve the above-described problem, a punching die according to one aspect of the present invention is bent so as to form a first belt-like blade and a two-dimensional shape in which a part of an annular shape is missing, and the annular missing part is formed. A second band-shaped blade whose both ends are in contact with the outer surface of the first band-shaped blade so as to be blocked by a part of the first band-shaped blade, and the first band-shaped blade and the second band-shaped blade are in contact with each other; In the contact area, a protrusion projecting toward the outer surface in the thickness direction is formed on the first band-shaped blade side, and a cutout that is recessed in the thickness direction on the second band-shaped blade side and engageable with the protrusion section. A notch is provided, and the second band-shaped blade is connected to the first band-shaped blade by engaging the notch with the projecting portion, thereby increasing the height of the second band-shaped blade with respect to the first band-shaped blade. is capable restricting the movement in the direction, that of the first band-shaped blade and the second band-shaped blade When the first band-shaped blade and the second band-shaped blade are attached to the base by fitting the end opposite to the blade edge of the base into the base, the protrusion and the notch are It is provided on the cutting edge side of the first belt-like blade and the second belt-like blade from the stand, respectively.

  In this aspect, the notch may be provided at each edge of the second belt-like blade.

  Moreover, the said aspect WHEREIN: The said notch may be provided in the blade tip side rather than the center position of the height direction in a said 2nd strip | belt-shaped blade.

  In the above aspect, each of the first belt-like blade and the second belt-like blade is provided continuously with the plate-like portion having a substantially uniform thickness and the plate-like portion, and the thickness is directed toward the blade edge. And the protrusion and the notch are respectively in the first belt-like blade and the second belt-like blade than the boundary between the plate-like portion and the blade portion. It may be provided on the plate-like part side.

  Moreover, the said aspect WHEREIN: The said projection part may be fixed in the state engaged with the said notch.

  Moreover, the said aspect WHEREIN: The said projection part may be welded in the state engaged with the said notch.

  According to the punching die according to the present invention, even when the punching process of the sheet material is repeated, it is possible to suppress a difference in height between the blade edges of adjacent blades.

FIG. 3 is a plan view showing a schematic configuration of the punching die according to the first embodiment. The perspective view which shows an example of the sheet | seat material of a process target. The perspective view which shows the tray which is an example of the product after a process. The perspective view which shows the structure of the strip shaped blade which makes | forms an annular | circular shape. The perspective view which shows the structure of the strip shaped blade which makes | forms the cyclic | annular form which one part lost. The perspective view which shows the state with which the strip | belt-shaped blade which makes | forms an annular | circular shape, and the strip | belt-shaped blade | blade which makes | forms the annular | circular shape which one part lost. FIG. 3 is a partial enlarged perspective view showing a contact portion between two adjacent band-shaped blades in the punching die according to the first embodiment. Sectional drawing of the double-edged strip-shaped blade. The top view of the connection part of two adjacent strip shaped blades in the punching die which concerns on Embodiment 1. FIG. The partial expansion perspective view which shows the structure of a notch and a projection part. The figure for demonstrating the position where the notch is provided. The perspective view which shows the structure of the connection part of the adjacent strip shaped blade in the punching die which concerns on Embodiment 2. FIG. The perspective view which shows the structure of the conventional punching die. The disassembled perspective view which shows the structure of the conventional punching die.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is a plan view showing a schematic configuration of a punching die according to the present embodiment. The punching die 1 is configured by arranging a strip-shaped punching blade 3 on one surface of a wooden base 2. Hereinafter, the side of the base 2 on which the punching blade 3 is arranged (the front side in FIG. 1) is referred to as the “front side”, and the opposite side (the back side in FIG. 1) is referred to as the “back side”. The “rear side”, the lower side is called “front side”, the right side is called “right side”, and the left side is called “left side”.

  The surface of the base 2 is a flat surface, and a groove (not shown) having a shape to be punched by laser processing is formed on the surface, and a strip-shaped punching blade 3 is fitted into the groove, thereby punching die. 1 is configured. The punching blade 3 is fitted into the groove of the base 2 at the end opposite to the cutting edge so that the cutting edge is positioned on the front side.

  FIG. 2A is a perspective view illustrating an example of a sheet material to be processed, and FIG. 2B is a perspective view illustrating a tray that is an example of a product after processing. When the punching die 1 is used, the sheet material 4 to be processed is arranged on the front side of the punching blade 3 of the punching die 1, and the sheet material 4 functions as a punching die 1 and a cutting board (not shown). Is cut and processed by being pushed out. The concave portion 41 provided in the sheet material 4 corresponds to each quadrangular shape of the punching die 1. That is, the sheet material 4 is arranged with respect to the punching die 1 so that the concave portion 41 of the sheet material 4 fits inside the square of the punching die 1, and the periphery of each concave portion 41 is cut by the punching blade 3. In this way, the tray 5 shown in FIG. 2B is created.

  As shown in FIG. 1, the punching blade 3 according to the present embodiment is arranged so as to form a plurality of quadrangles with rounded corners. Each square is a shape in which the sheet material 4 is punched, that is, the shape of the tray 5 that is a product. Thus, the punching blade 3 is arranged along the shape to be punched, and the shape is not limited to a quadrangle.

  In FIG. 1, the punching blades 3 are arranged so that five squares in the front-rear direction and six squares in the left-right direction are arranged in a matrix. Hereinafter, the punching blade 3 will be described in detail.

  The punching blade 3 includes six blade units 31 that can cut a sheet material in five squares in the front-rear direction and arranged in the left-right direction. The blade unit 31 is composed of five strip blades 311 to 315.

  FIG. 3A is a perspective view showing the configuration of the strip blade 311, and FIG. 3B is a perspective view showing the configuration of the strip blade 312.

  Of the strip blades 311 to 315 constituting the blade unit 31, the strip blade 311 located at the rearmost side is bent into a square ring with rounded corners. Each of the other strip-shaped blades 312 to 315 is bent into a quadrangular annular shape with one side on the rear side missing. In FIG. 3B, only the configuration of the band-shaped blade 312 is shown, but the band-shaped blades 313 to 315 have the same configuration. In the present embodiment, an annular belt-like blade 311 is arranged at the rearmost side of the blade unit 31, and annular belt-like blades 312 to 315 partially missing are arranged in series on the front side of the belt-like blade 311. However, the present invention is not limited to this. An annular belt-like blade 311 is arranged at a position other than both ends of a blade unit in which a plurality of belt-like blades are arranged in series, and the belt-like blades 312 to 315 partially missing on both sides of the belt-like blade 311 are arranged in series. It is also possible to adopt a configuration in which these are arranged. Also, a part of the band-shaped blade 311 may be missing in the same manner as the other band-shaped blades 312 to 315. For example, the right or left side of the strip blade 311 may be missing, and in that case, the missing portion may be blocked by the left portion or the right portion of the strip blade 311 constituting the adjacent blade unit 31. That's fine. As described above, a belt-like blade in which all the belt-like blades 311 to 315 constituting the blade unit 31 are partially omitted may be used.

  In the present embodiment, the belt-like blade 312 has a quadrangular annular shape with one side missing, but two or three sides may be missing. For example, a total of two sides, one side on the rear side and one side on the front side of the belt-like blade 312 are missing, and these missing portions may be closed with the front portion of the belt-like blade 311 and the rear portion of the belt-like blade 313, respectively. Good. In addition to this, various aspects can be realized.

  The band-shaped blade 312 adjacent to the band-shaped blade 311 has its both ends 312a (refer to FIG. 3B) at the both ends 312a (refer to FIG. 3B) so as to close the rear part of the square annular portion missing with the front portion 311a (refer to FIG. 3A). Abut. Thus, a rectangular shape with rounded corners is formed by the band-shaped blade 312 and the front side portion of the band-shaped blade 311 (see FIG. 4). The front portion 311a of the belt-like blade 311 is a portion including a straight portion on the front side of the belt-like blade 311 having a quadrangular ring shape and arc-shaped portions at both ends thereof.

  Similarly, the belt-like blades 313 to 315 are in contact with the belt-like blades 312 to 314 at both ends so as to block the missing rear side portion of the square ring with the front portion of the belt-like blades 312 to 314 adjacent to the rear side. Is done. That is, both ends of the belt-like blade 313 are brought into contact with the front portion 312c (see FIG. 3B) of the belt-like blade 312 so as to block the rectangular missing portion of the belt-like blade 313, and both ends of the belt-like blade 314 are Both ends of the belt-like blade 315 are brought into contact with the front side portion of the belt-like blade 314 so as to close the square-like missing portion of the belt-like blade 314 so as to close the square-like missing portion. The As a result, a rectangular shape with rounded corners is formed by the strip blade 313 and the rear portion of the strip blade 312, and a square with rounded corners by the strip blade 314 and the rear portion of the strip blade 313. A shape is formed, and a rectangular shape with rounded corners is formed by the band-shaped blade 315 and the rear portion of the band-shaped blade 314.

  As shown in FIG. 3A, projections 311 b and 311 b projecting outward in the horizontal direction are provided at the boundary between the front side portion of the strip-shaped blade 311 and the straight line portion in both arc-shaped portions. Further, notches 312b and 312b having shapes that can be engaged with the protrusions 311b and 311b are provided at the edges of both ends 312a and 312a of the belt-like blade 312 respectively. By engaging these notches 312b and 312b with the protrusions 311b and 311b, both ends 312a and 312a of the strip blade 312 are connected to the front portion of the strip blade 311 (see FIG. 4). As a result, the belt-like blade 312 is restricted from moving in the front-back direction with respect to the belt-like blade 311. The details of the structure of the protrusion 311b and the notch 312b and the connection structure between the strip blade 311 and the strip blade 312 will be described later.

  FIG. 5 is a partially enlarged perspective view showing a contact portion between the band-shaped blade 311 and the band-shaped blade 312 in the punching die 1. The front portion 311a of the belt-like blade 311 and both ends of the belt-like blade 312 are in contact with each other without a gap. In addition, in order to form a square with rounded corners by the band-shaped blade 312 and the front part 311a of the band-shaped blade 311, the band-shaped blade 312 is provided at the end of the arc-shaped part 311c of the front part of the band-shaped blade 311. The end portions 312a need to be smoothly connected. For this reason, as shown in FIG. 5, a tapered surface 312 d is provided at the end 312 a of the belt-like blade 312. The tapered surface 312d has a shape corresponding to the outer shape of the end portion of the arc-shaped portion 311c in the front portion of the band-shaped blade 311, and the entire tapered surface 312d can be in close contact with the end portion of the arc-shaped portion 311c. As described above, it is preferable that the front portion 311a of the band-shaped blade 311 and both ends of the band-shaped blade 312 are in contact with each other without a gap, but there may be a slight gap.

  FIG. 6 is a cross-sectional view of a belt-like blade. In the present embodiment, the belt-like blades 311 to 315 are double-edged Thomson blades. That is, as shown in FIG. 6, the blade portion 301 of the belt-like blade is inclined on both sides and is formed so as to become thinner toward the tip. The band-shaped blades 311 to 315 have the blade portions 301 inclined on both sides as described above and the plate-shaped portions 302 having a substantially uniform thickness. Reference numeral 303 indicates a ridge line between the blade portion 301 and the plate-like portion 302.

  FIG. 7 is a plan view of a connection portion between the band-shaped blade 311 and the band-shaped blade 312. The band-shaped blade 311 and the band-shaped blade 312 are attached to the base 2 such that the tapered surface 312d is in close contact with the terminal portion of the arc-shaped portion 311c. Here, by providing the tapered surface 312d, the band-shaped blade 311 and the band-shaped blade 312 are connected so that the edge line of the blade edge of the band-shaped blade 311 and the edge line of the blade edge of the band-shaped blade 312 are smoothly connected. As a result, the sheet material 4 can be cut into two identical quadrangular shapes by the belt-like blade 311 and the belt-like blade 312 without causing uncut portions in the sheet material 4.

Next, the structure of the protrusion 311b and the notch 312b and the connection structure between the strip blade 311 and the strip blade 312 will be described in detail.
FIG. 8 is a partially enlarged perspective view showing the configuration of the protrusion 311b and the notch 312b. As shown in FIG. 8, the protrusion 311 b provided on the band-shaped blade 311 is a substantially rectangular plane formed so as to be substantially the same plane as the plane of the straight portion in the front portion of the band-shaped blade 311. It is comprised by the part 3111 and the intermediate part 3112 which connects the flat part 3111 and the outer surface of the circular arc part in the front side part of the strip-shaped blade 311. The protrusion 311b is formed by projecting a part of the arc-shaped portion in the front portion of the band-shaped blade 311 from the inner surface side to the outer surface side using a predetermined jig. On the other hand, the notch 312 b provided in the belt-like blade 312 is formed at the edge portion by cutting the end 312 a of the belt-like blade 312. The cutout 312b is substantially the same shape as the outer shape of the flat surface portion 3111 of the protrusion 311b and slightly larger when viewed in the horizontal direction.

  As described above, in this embodiment, the cutout 312b has substantially the same shape as the outer shape of the flat surface portion 3111 of the protruding portion 311b, but the present invention is not limited to this. For example, the cutout 312b may be longer in the left-right direction (horizontal direction) than the outer shape of the plane portion 3111. In this case, both ends of the belt-like blade 312b can be slid in the left-right direction while maintaining the state in which the notch 312b is engaged with the protrusion 311b. This makes it possible to easily adjust the positions of both ends.

  Note that the dimensions of the sheet material are not always constant due to differences in thermal shrinkage due to differences in raw resin, variations in manufacturing conditions, and the like, and there may be errors for each manufacturing lot. When such a dimensional error of the sheet material occurs, cutting defects are likely to occur if the position of each band-shaped blade remains fixed. In view of this, it has been conventionally proposed to adjust the position of each band-shaped blade by configuring the base with a plurality of plate-like members and moving each of those plate-like members in an appropriate amount in the front-rear and left-right directions. (For example, see Registered Utility Model No. 2574388). Also in this embodiment, the position of the band-shaped blade may be adjusted by configuring the base 2 with a plurality of plate-like members or the like in the same manner. In this case, as described above, when the notch 312b is longer in the left-right direction (horizontal direction) than the outer shape of the flat surface portion 3111, the state in which the notch 312b is engaged with the protruding portion 311b is maintained. However, the end of the belt-like blade 312b can be slid in the left-right direction for convenience.

  By engaging the notches 312 b and 312 b of the belt-like blade 312 configured as described above with the protrusions 311 b and 311 b of the belt-like blade 311, both ends 312 a of the belt-like blade 312 are connected to the front portion of the belt-like blade 311. (See FIG. 4). Thus, when both ends 312a of the band-shaped blade 312 are connected to the front side portion of the band-shaped blade 311, the protrusions 311b and the cutouts in the front and back directions are cut out so that the heights of the blade edges of the band-shaped blade 311 and the band-shaped blade 312 are the same. The relative position to 312b is adjusted.

  The thickness (the length in the horizontal direction) of the protruding portion 311b is set to be substantially the same as the thickness of the end portion 312a of the belt-like blade 312 provided with the tapered surface 312d. Thereby, when the notch 312b is engaged with the protruding portion 311b, the flat surface portion 3111 of the protruding portion 311b and the inner surface of the end portion 312a of the band-shaped blade 312 are connected without a step. Therefore, the protrusion 311b does not protrude from the inner surface of the end 312a of the band-shaped blade 312 to the front side, so that it is possible to prevent the product tray 5 from being damaged. Even if the protruding portion 311b protrudes from the inner surface to the front side, the tray 5 is not damaged as long as the amount is small. Therefore, the protrusion 311b may protrude a small amount from the inner surface to the front side. On the contrary, the flat surface portion 3111 of the protruding portion 311b may be located on the back side of the inner surface of the end portion 312a. That is, the protrusion 311b may be positioned in the notch 312b.

  As described above, the end 312a of the band-shaped blade 312 is formed thinner toward the tip by providing the tapered surface 312d, and is easily deformed. Since the notch 312b formed in the easily deformable end 312a is engaged with and connected to the protrusion 311b, the end 312a is reinforced by the strip blade 311 and the deformation of the end 312a is suppressed. It becomes possible.

  FIG. 9 is a diagram for explaining a position where the notch 312b is provided. The closer the position where the notch 312b is formed to the back side, that is, the closer the engaging part between the projection 311b and the notch 312b is to the back side, the distance between the blade edge of the belt-like blade 311 and the belt-like blade 312 and the engaging part Therefore, a gap is easily generated between the band-shaped blade 311 and the band-shaped blade 312. On the other hand, as the position where the notch 312b is formed is on the front side, that is, the closer the engagement portion between the protrusion 311b and the notch 312b is on the front side, the distance between the blade edge and the engagement portion becomes smaller. The gap is less likely to occur. Considering this point, as shown in FIG. 9, the notch 312 b is provided on the blade edge side with respect to the center position in the height direction A in the portion of the belt-like blade 312 that protrudes from the surface of the base 2 to the front side. It is preferable. More specifically, it is preferable that the back side end of the notch 312b is provided on the front side of the center position. Thereby, generation | occurrence | production of the cutting defect resulting from a clearance gap producing between the strip shaped blade 311 and the strip shaped blade 312 can be suppressed.

  In addition, when notch 312b is formed in the blade part 301, the intensity | strength of the blade part 301 is not enough and there exists a possibility of causing a cutting defect as a result. Therefore, it is preferable that the notch 312 b is provided on the back side of the ridgeline 303 between the blade portion 301 and the plate-like portion 302. More specifically, it is preferable that the entire notch 312 b is provided in the plate-like portion 302 by positioning the front side end of the notch 312 b on the back side of the ridgeline 303.

  In the case of the present embodiment, the end portion 312a of the strip blade 312 is not fixed to the front portion 311a of the strip blade 311 by welding or the like. The band-shaped blades 311 and 312 are fixed to the base 2 so that the end 312a of the band-shaped blade 312 is kept in close contact with the front portion 311a of the band-shaped blade 311. This is because the band-shaped blades 311 and 312 can be separated so that any one of the band-shaped blades 311 and 312 can be easily replaced or repaired.

  The protrusion 311b and the notch 312b may be provided at a position located in the groove when the belt-like blades 311 and 312 are fitted into the groove of the base 2, but as in the present embodiment. It is preferable to be provided at a position located on the front side of the surface of the base 2. The latter is superior in workability when engaging the protrusion 311b and the notch 312b.

  Since the connection structure between the band-shaped blade 311 and the band-shaped blade 312 as described above is the same in the other band-shaped blades 313 to 315, the description thereof will be omitted.

  As described above, by engaging the notch 312 b of the band-shaped blade 312 with the protrusion 311 b of the band-shaped blade 311, both ends 312 a of the band-shaped blade 312 are connected to the front portion of the band-shaped blade 311. When cutting the sheet material 4 using the strip blades 311 and 312 connected in this manner, a force is generated in the direction in which both ends of the strip blade 312 spread, and as a result, the end portions of the strip blade 311 and the strip blade 312 There may be a slight gap between the cutting edges. Even if a gap is generated between the blade edges of the belt-like blade 311 and the belt-like blade 312 as described above, the belt-like blade 312 moves in the front-back direction with respect to the belt-like blade 311 because the notch 312 is engaged with the projection 311b. To be regulated. Accordingly, it is possible to suppress the band-shaped blade 311 and the band-shaped blade 312 from being displaced from each other in the front-back direction, and it is possible to maintain a state where the heights of the band-shaped blade 311 and the band-shaped blade 312 are the same.

(Embodiment 2)
The punching die according to the present embodiment is one in which a strip-like blade that is a single-edged Thomson blade is attached to a base.

  FIG. 10 is a perspective view showing a configuration of a connecting portion of adjacent band-shaped blades in the punching die according to the present embodiment. The band-shaped blade 321 is configured by bending a one-sided Thomson blade in an annular shape, and the band-shaped blade 322 is configured by bending an annular shape in which the one-sided Thomson blade is partially omitted. In the band-shaped blade 321 and the band-shaped blade 322, the end 322 a of the band-shaped blade 322 is brought into contact with the band-shaped blade 321 so that the missing part of the band-shaped blade 322 is closed by the band-shaped blade 321. Although not shown in the drawing, the punching die according to the present embodiment is provided with a plurality of strip-shaped blades having the same shape as the strip-shaped blade 322, and the missing portion of one of the strip-shaped blades is adjacent to the other. These are arranged so as to be linked in a chain so as to be closed with a band-shaped blade. These band-shaped blades have the same configuration as the band-shaped blade 322 described below, and the connection structure of adjacent band-shaped blades is the same as the connection structure of the band-shaped blades 321 and 322.

  In the band-shaped blades 321 and 322, the inclined surface of the blade portion 304 is provided on the inner surface of the band-shaped blades 321 and 322 arranged in an annular shape. That is, the outer side surfaces of the band-shaped blades 321 and 322 are provided with only a very small inclined portion, and the outer side surface is a substantially flat surface in the entire front and back direction.

  As described above, since the outer surfaces of the band-shaped blades 321 and 322 are substantially flat in the front and back direction, the front end of the outer surface of the band-shaped blades 321 and 322 is the cutting edge. That is, the cutting edges of the band-shaped blades 321 and 322 are provided along the outer surfaces of the band-shaped blades 321 and 322. For this reason, unlike the case of Embodiment 1, the taper surface for making it contact | adhere to the strip shaped blade 321 is not provided in the edge part 322a of the strip shaped blade 322. FIG. Even if the end portion 322a of the band-shaped blade 322 is not provided with a tapered surface, the cutting edge of the band-shaped blade 321 and the edge of the band-shaped blade 322 substantially coincide with each other at the connection portion between the band-shaped blade 321 and the end 322a of the band-shaped blade 322. To do. In addition, in order to make a blade edge | tip match in the connection part of the strip shaped blades 321 and 322, you may provide a small taper surface in the front-end | tip of the strip shaped blade 322. FIG.

  As shown in FIG. 10, similarly to the case of the first embodiment, projections 321b and 311b are provided at the boundary between the arcuate portions of the front portion 321a of the band-shaped blade 321 and the straight portions. Further, notches 322b and 322b each having a shape engageable with the protrusions 321b and 321b are provided at the edge of the end 312a of the band-shaped blade 322, respectively. By engaging these notches 322 b and 322 b with the projections 321 b and 321 b, both ends 322 a and 322 a of the strip blade 322 are connected to the front portion of the strip blade 311.

  In addition, since the other structure of the punching die which concerns on this Embodiment is the same as that of the punching die which concerns on Embodiment 1, the description is abbreviate | omitted.

(Other embodiments)
In the first embodiment described above, the flat surface portion 3111 included in the protrusion 311b provided on the belt-like blade 311 has a substantially rectangular shape. However, the present invention is not limited to this, and the semicircular shape and the square shape are not limited thereto. Other shapes such as a trapezoidal shape, a trapezoidal shape, and a triangular shape may be used. In that case, the notch 312 b provided in the belt-like blade 312 also has the same shape as the protrusion 311. As described above, in the case of the second embodiment, it is possible to employ various shapes for the protrusion and the notch.

  Moreover, in each embodiment mentioned above, although the edge part of the strip-shaped blade 312 (322) is not fixed to the front side part of the strip-shaped blade 311 (321), this invention is not necessarily limited to this and is fixed. It may be. For example, the protrusion 311b (321b) may be welded in a state of being engaged with the notch 312b (322b). Of course, the protrusion 311b (321b) may be fixed in a state of being engaged with the notch 312b (322b) by other means. Thereby, it can prevent more reliably that a shift | offset | difference arises in the height of the blade edge | tip of both strip | belt-shaped blades. When the sheet material 4 is cut, a force is generated in a direction in which both ends of the band-shaped blade 312 (322) are separated from each other. As described above, the end of the band-shaped blade 312 (322) is the band-shaped blade 311 (321). If it is fixed to the front side portion, the two ends are prevented from separating from each other, and the shape of the band-shaped blade 312 (322) is maintained. Thereby, it is suppressed that a clearance gap arises between the edge part of the strip shaped blade 312 (322), and the strip shaped blade 311 (321).

  Further, in each of the above-described embodiments, the notch 312b (322b) is provided at both ends of the strip blade 312 (322), but the notch 312b (322b) is provided only at one end. Also good. In that case, the band-shaped blade 311 (321) is provided with the protrusion 311b (321b) only in the arc-shaped portion corresponding to the one end. Moreover, in each embodiment mentioned above, although the number of the notches 312b (322b) provided in the edge part of the strip | belt-shaped blade 312 (322) is 1, it may be plural. In this case, the band-shaped blade 311 (321) is provided with a number of protrusions 311b (321b) corresponding to the number of the notches 312b (322b).

  Further, in each of the above-described embodiments, the notch 312b (322b) is provided at the edge of the end of the strip blade 312 (322), but the notch 312b (322b) is provided at a position slightly away from the edge. ) May be provided.

  The punching die of the present invention is useful as a punching die for cutting a sheet material used for a paper box, a cardboard box and the like.

DESCRIPTION OF SYMBOLS 1 Punching die 2 Base 3 Punching blade 4 Sheet material 5 Tray 31 Blade unit 311 to 315 Strip blade 311a Front part 311b Protruding part 311c Arc part 312a End part 312b Notch 312c Front part 312d Tapered surface 301 Blade part 302 Plate shape Part 303 ridgeline

Claims (6)

A first strip blade;
It is bent so as to form a two-dimensional shape in which a part of the annular shape is missing, and both ends thereof are in contact with the outer surface of the first belt-like blade so as to block the annular missing part with a part of the first belt-like blade. A second belt-shaped blade,
In the region where the first belt-shaped blade and the second belt-shaped blade are in contact with each other, the first belt-shaped blade has a protrusion projecting outward in the thickness direction , and the second belt-shaped blade has a thickness. A notch that is depressed in the direction and engageable with the protrusion , respectively,
By engaging the notch with the protrusion and connecting the second strip blade to the first strip blade, movement of the second strip blade in the height direction with respect to the first strip blade can be restricted . Yes,
When the first belt-like blade and the second belt-like blade are attached to the base by inserting the end portions of the first belt-like blade and the second belt-like blade on the opposite side to the cutting edge. In addition, the protrusion and the notch are provided on the cutting edge side of the first band-shaped blade and the second band-shaped blade from the base, respectively.
Punching mold. The notches are respectively provided at the edge portions at both ends of the second strip-shaped blade.
The punching die according to claim 1. The notch is provided on the blade edge side with respect to the center position in the height direction of the second belt-like blade.
The punching die according to claim 1 or 2. Each of the first band-shaped blade and the second band-shaped blade is a plate-shaped portion having a substantially uniform thickness, and a blade portion that is provided continuously to the plate-shaped portion and decreases in thickness toward the blade edge. And
The protrusion and the cutout are provided on the plate-like portion side of the first belt-like blade and the second belt-like blade, respectively, than the boundary between the plate-like portion and the blade portion.
The punching die according to any one of claims 1 to 3. The protrusion is fixed in an engaged state with the notch,
The punching die according to any one of claims 1 to 4. The protrusion is welded in a state of being engaged with the notch,
The punching die according to claim 5.

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