JP2020199583A - Punching device - Google Patents

Abstract

To provide a punching device that can punch out a product in which heights of cut surfaces differ depending on sites, with a simple structure.SOLUTION: The punching device comprises: a punching cutter blade mold comprising a punching blade formed by folding down a belt-like blade annularly; a reception mold 2 comprising a support member 22, formed by folding down a belt-like plate material annularly, which supports a sheet material 31 around the punching blade when punching out a product form the sheet material 31; and a constraining member that constrains the sheet material 31 around the support member 22. The support member 22 is formed so that heights of a support surface that supports the sheet material 31 differ depending on sites, and the plate material is folded down to be formed in a contour shape following a contour of the punching blade.SELECTED DRAWING: Figure 8B

Description

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

Products such as trays made of synthetic resin are manufactured by cutting a sheet material (work material) which is a material by a punching device provided with a Thomson blade formed by bending a strip-shaped blade. Conventionally, many of such products have a flat cut surface shape, but in recent years, the number of such products having a height difference is increasing.

As a technique for punching a product having a shape in which the cut surface has a height difference as described above, Patent Document 1 describes a product portion formed as a recess and a flange shape to the outside of the recess around the upper edge of the recess of the product portion. The product part is made of a plastic molded product having a blank part formed by overhanging the product part and a bulging part for forming an upper edge changing part formed by bulging from the concave portion of the product part and the upper edge of the concave portion toward the outside of the concave portion. In order to punch out, the blank portion was pressed against the punching table, and the plastic molded product was supported by using the main convex portion for positioning and supporting the product portion and the auxiliary convex portion for supporting the bulging portion for forming the upper edge changing portion. Above, a punching device for punching a product portion having an upper edge changing portion by cutting the outer periphery of the recess and the bulging portion for forming the upper edge changing portion with a Thomson blade is disclosed.

Patent No. 4972226

However, in the case of the above-mentioned conventional punching device, when the shape of the bulging portion for forming the upper edge changing portion of the plastic molded product becomes complicated, an auxiliary convex portion having a shape along the bulging portion for forming the upper edge changing portion is formed. It cannot be easily created, which causes problems such as high cost.

The present invention has been made in view of such circumstances, and a main object thereof is to provide a punching device capable of solving the above problems.

In order to solve the above-mentioned problems, the punching device according to one aspect of the present invention is formed by bending a strip-shaped blade in an annular shape in a punching device for punching a product in which the height of the cut surface differs depending on a portion from a sheet material. A punching blade type having a punched blade, and a receiving mold having a support member formed by bending a strip-shaped plate material in an annular shape and supporting the sheet material around the punching blade when punching the product. A restraining member that restrains the sheet material is provided around the support member, and the support member is formed so that the height of the support surface that supports the sheet material differs depending on the portion, and the contour of the punching blade. The plate material is bent so as to have a contour shape along the above.

In this aspect, it is preferable that the heights of at least one portion of the support surface and the supported surface are the same.

In this aspect, it is preferable that the height of the highest point of the supporting surface and the height of the highest point of the supported surface match.

In this aspect, it is preferable that the height of the lowest point of the supporting surface and the height of the lowest point of the supported surface match.

Further, in the above aspect, it is more preferable that the support member is formed so that the height of the support surface differs depending on the height of the supported surface.

Further, in the above aspect, the restraining member is composed of elastic members formed on each of the punching blade mold and the receiving mold, and when the punching blade mold and the receiving mold are relatively close to each other. The sheet material may be sandwiched between the elastic members.

According to the punching device according to the present invention, it is possible to punch a product having a complicated shape with a simple configuration.

The plan view which shows the structure of the punching blade type which concerns on embodiment. The front sectional view which shows the structure of the punching blade type which concerns on embodiment. The perspective view which shows the tray which is an example of a product. A side view showing a tray which is an example of a product. The side view which shows the structure of the punching blade type which concerns on embodiment. The plan view which shows the structure of the receiving type which concerns on embodiment. The front sectional view which shows the structure of the receiving mold which concerns on embodiment. The side view which shows the structure of the receiving type which concerns on embodiment. The side view which shows the structure of the receiving mold which concerns on embodiment when supporting a sheet material. The side view which shows the structure of the receiving mold which concerns on embodiment when supporting a sheet material. The schematic diagram which shows the punching process of a sheet material by a punching apparatus. The schematic diagram which shows the punching process of a sheet material by a punching apparatus. The schematic diagram which shows the punching process of a sheet material by a punching apparatus. The schematic diagram which shows the punching process of a sheet material by a punching apparatus. The side view which shows the structure of the modification of the receiving type which concerns on embodiment. The side view which shows the structure of the modification of the receiving type which concerns on embodiment. A perspective view showing a tray of another example of the product. Side view showing a tray of another example of the product. A perspective view showing a tray of another example of the product. Side view showing a tray of another example of the product.

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

The punching device according to the present embodiment includes a punching blade type provided with a punching blade and a receiving type. Hereinafter, the configurations of these punching blade molds and receiving molds will be described.

[Punching blade type configuration]
FIG. 1 is a plan view showing a structure of a punching blade type according to the present embodiment. Further, FIG. 2 is a front sectional view thereof. The punching blade type 1 is configured by arranging a strip-shaped punching blade 12 on one surface of a wooden base 11. Hereinafter, the side on which the punching blade 12 of the base 11 is arranged is referred to as a "front side", and the opposite side thereof is referred to as a "back side".

The surface of the base 11 is a flat surface, and a groove (not shown) having a shape to be punched by laser processing is formed on this surface, and the punching blade 12 formed by bending a strip-shaped blade in an annular shape in the groove. Is fitted to form the punching blade mold 1. The punching blade 12 is fitted with an end portion on the opposite side of the cutting edge into the groove of the base 11 so that the cutting edge is positioned on the front side.

An elastic member 13 attached to the base 11 is provided on the outer peripheral side of the punching blade 12. The elastic member 13 is made of a urethane sponge. A slight gap is formed between the punching blade 12 and the elastic member 13. As will be described later, the elastic member 13 functions as a restraining member for restraining the sheet material to be processed together with the elastic member provided on the receiving mold side.

FIG. 3A is a perspective view showing a tray which is an example of a product obtained by punching a sheet material to be processed, and FIG. 3B is a side view showing the tray. As will be described later, the sheet material to be processed is arranged on the front side of the punching blade 12 of the punching blade mold 1, and the sheet material is sandwiched between the punching blade mold 1 and the pedestal described later and cut. As a result, the tray 3 is produced.

As shown in FIGS. 3A and 3B, the cut surfaces (upper end surfaces) 3a on both side surfaces of the tray 3 have a shape having a height difference. More specifically, the cut surfaces 3a on both side surfaces of the tray 3 have a shape in which the central portion is the highest and the cut surfaces 3a are gradually lowered from the central portion toward the end portions. On the other hand, the heights of the cut surfaces on the front and back surfaces of the tray 3 are constant and are the same as the height of the cut surfaces at the side end portions. As described above, the tray 3 has a region in which the height of the cut surface differs depending on the portion.

FIG. 4 is a side view showing the configuration of the punching blade mold 1. As shown in FIG. 4, since the punching blade 12 has a constant height over the entire circumference, the cutting edges are on the same plane. As described above, in the present embodiment, the tray 3 in which the height of the cut surface differs depending on the portion is punched by using the punching blade 12 whose cutting edges are on the same plane. Although the description of the elastic member 13 is omitted in FIG. 4, the elastic member 13 also has a constant height over the entire circumference like the punching blade 12, and the height of the punching blade 12 and the elastic member 13 is high. Is the same. However, the heights of the punching blade 12 and the elastic member 13 may be different.

[Receiver type configuration]
FIG. 5 is a plan view showing the configuration of the receiving mold according to the present embodiment. Further, FIG. 6 is a front sectional view thereof. The receiving mold 2 is configured by arranging a strip-shaped support member 22 on one surface of a wooden base 21. Hereinafter, the side on which the support member 22 of the base 21 is arranged is referred to as a "front side", and the opposite side thereof is referred to as a "back side".

The surface of the base 21 is a flat surface, and a groove (not shown) having a shape similar to that of the punching blade 12 is formed on this surface by laser processing, and a strip-shaped plate material is formed by bending the strip-shaped plate material in an annular shape in the groove. The receiving mold 2 is formed by fitting the supporting member 22 together. The end of the support member 22 opposite to the support surface is fitted into the groove of the base 21 so that the support surface that supports the sheet material is positioned on the front side.

The support member 22 has a contour shape along the contour of the punching blade 12, and has an outer peripheral shape that is one size larger than the outer peripheral shape of the punching blade 12. As a result, the support member 22 can support the sheet material on the outside of the punching blade 12 when the sheet material is cut so that the punching blade mold 1 and the receiving mold 2 are relatively close to each other.

An elastic member 23 is attached to the base 21 so as to be in contact with the outer surface of the support member 22. Similar to the elastic member 13 described above, the elastic member 23 is made of a urethane sponge. The elastic member 23 functions as a restraining member for restraining the sheet material to be processed together with the elastic member 13 provided on the punching blade mold 1 side.

As shown in FIG. 6, a quadrangular through hole 24 is provided in the central portion of the base 21. The through hole 24 serves as a space for accommodating the bottom portion of the product punched from the sheet material when the sheet material is cut.

FIG. 7 is a side view showing the configuration of the receiving mold 2. As shown in FIG. 7, the support surface (upper end surface) of the side surface of the support member 22 has the highest central portion and gradually decreases from the central portion toward the end portion, similarly to the cut surface of the tray 3. It has such a shape. Although the description of the elastic member 23 is omitted in FIG. 7, the elastic member 23 also has the same shape as the support member 22. In the present embodiment, the heights of the support member 22 and the elastic member 23 are the same, but may be different.

8A and 8B are side views showing the configuration of the receiving mold 2 when supporting the sheet material. In the present embodiment, the sheet material 31 is arranged so that the back surface side of the sheet material 31 faces the front side of the receiving mold 2 (see FIG. 8A), and when the subsequent punching process is performed, the sheet material 31 is attached to the support member 22. It is supported (see FIG. 8B). In this case, the back surface of the sheet material 31 is the supported surface 3b, and the supported surface 3b is in contact with the support surface 22a which is the upper end surface of the support member 22, so that the sheet material 31 is supported by the support member 22.

In addition, unlike the above, there may be a mode in which the sheet material 31 is arranged so that the surface side of the sheet material 31 faces the front side of the receiving mold 2. In that case, the surface of the sheet material 31 becomes the supported surface.

In the state where the sheet material 31 is supported by the support member 22 as described above, the heights of the support surface of the support member 22 and the supported surface of the sheet material 31 are the same. That is, the support member 22 is formed so that the height of the support surface differs depending on the height of the supported surface of the sheet material 31. Therefore, since the supported surface is supported by the entire surface of the supporting surface, the sheet material 31 can be stably supported.

[Punching process]
Hereinafter, the punching process of the sheet material 31 will be described. 9A and 9B are schematic views showing a punching process of the sheet material 31 by the punching device of the present embodiment. When the sheet material 31 is punched, the sheet material 31 is arranged between the punching blade die 1 and the receiving die 2 as shown in FIG. 9A. In the present embodiment, the sheet material 31 is cut by the punching blade mold 1 arranged above the sheet material 31, but the punching blade mold 1 may be arranged below the sheet material 31.

With the sheet material 31 arranged as described above, the punching blade mold 1 is lowered and the receiving mold 2 is raised, so that the sheet material 31 is sandwiched between the punching blade mold 1 and the receiving mold 2. In this state, the punching blade die 1 and the receiving die 2 are relatively close to each other (see FIG. 9A).

The upper surface of the sheet material 31 comes into contact with the lower end surface of the elastic member 13 of the punching blade mold 1, and the lower surface thereof is the upper end surface of the elastic member 23 of the receiving mold 2 and the support surface which is the upper end surface of the support member 22. (See FIG. 9B). As a result, the sheet material 31 is sandwiched by the elastic members 13 and 23 and restrained so as not to move. This makes it possible to prevent the sheet material 31 from being pulled and moving when the sheet material 31 is cut by the punching blade 12.

Further, in the state where the sheet material 31 is sandwiched between the elastic members 13 and 23 as described above, the sheet material 31 is supported by the support member 22 outside the punching blade 12. In this way, since cutting is performed by the punching blade 12 in a state where the supported surface of the sheet material 31 is supported, stable cutting processing can be performed.

When the sheet material 31 is cut by the punching blade 12 as described above, the upper end portion of the support member 22 is accommodated in the gap formed between the punching blade 12 and the elastic member 13. This makes it possible to prevent the support member 22 from interfering with other members.

In the present embodiment, a gap is formed between the punching blade 12 and the elastic member 13, but the punching blade 12 and the elastic member 13 are provided in contact with each other, and no gap is formed between them. You may. Even in that case, it is possible to prevent the support member 22 from interfering with other members depending on the height of the support member 22. Further, even if they interfere with each other, no particular problem will occur as long as the support member 22 is in contact with the lower end portion of the elastic member 13.

10A and 10B are schematic views showing a punching process when viewed from the side surface of the punching device. In addition, in FIGS. 10A and 10B, the description of the elastic members 13 and 23 is omitted. As shown in FIG. 10A, when the sheet material 31 is cut, the cutting edge of the punching blade 12 first comes into contact with the highest point of the cut surface of the sheet material 31. Therefore, since the cut surface is flat, cutting can be started with a smaller force than when the cutting edge of the punching blade 12 comes into contact with the entire surface of the cut surface. Further, since the height of the highest point of the support surface of the support member 22 and the height of the highest point of the supported surface of the sheet material 31 match, the cut portion is supported by the support member 22 at the start of cutting. Therefore, cutting can be started stably.

After that, the sheet material 31 is sequentially cut toward the lowest point portion of the cut surface, and the lowest point portion is cut to punch out the sheet material 31 to produce a tray 3 (see FIG. 10B). .. In the case of the present embodiment, since the height of the lowest point of the support surface of the support member 22 and the height of the lowest point of the supported surface of the sheet material 31 are the same, the cut portion is the support member at the end of cutting. Since it will be supported by 22, the cutting can be completed smoothly.

As described above, when the sheet material 31 is cut, the sheet material 31 is restrained by the elastic members 13 and 23 and then supported by the support member 22. By stably fixing the sheet material 31 in this way, the sheet material 31 can be cut in the air by the punching blade 12. When the cut surface of the sheet material 31 has a shape having a height difference, the rigidity is higher than that when the cut surface is flat, so that cutting in the air can be easily performed.

In the case of the present embodiment, the support member 22 can be manufactured only by processing the upper end surface of the strip-shaped plate material into the same shape and then bending it in an annular shape. Therefore, even if the cut surface of the sheet material 31 has a complicated shape and has a height difference, the support member 22 corresponding to the cut surface can be easily manufactured, so that the cost can be reduced. ..

(Other embodiments)
[Height of the support surface of the support member]
In the case of the above embodiment, the support member 22 is formed so that the height of the support surface differs depending on the height of the supported surface of the sheet material 31, but the present invention is limited to this. is not. For example, as shown in FIG. 11, by providing a convex portion in the central portion of the support member 22, the heights of the highest and lowest points of the support surface of the support member 22 and the highest and lowest points of the supported surface of the sheet material 31 While the heights of the points are the same, the height of the support surface and the height of the supported surface may be different in other parts. Even in this case, when the cutting edge of the punching blade 12 first comes into contact with the cut surface of the sheet material 31, the cut portion is supported by the support member 22, so that cutting can be started stably. Further, since the cutting portion is supported by the support member 22 at the end of cutting, the cutting can be completed smoothly.

Further, as shown in FIG. 12, the support surface on the side surface of the support member 22 has a shape in which the central portion of the support member 22 is the highest and is inclined so as to be lowered from the central portion toward the end portion. The height of the highest point of the support surface of the support member 22 and the height of the highest point of the supported surface of the sheet material 31 are the same, while the height of the support surface and the height of the supported surface are the same in other parts. May be different. Even in this case, since the cutting portion is supported by the support member 22 at the start of cutting, the cutting can be started stably.

Further, the height of the portion other than the highest point or the lowest point on the support surface of the support member 22 may be the same as the height of the portion at the position corresponding to the portion on the supported surface of the sheet material 31. .. In this case, the cut portion is not supported by the support member 22 at the start of cutting or at the end of cutting, but the cut portion is supported by the support member 22 in the process of cutting, so that stable cutting occurs. Processing becomes possible. As described above, the heights of at least one portion on the support surface and the supported surface need to be the same, and the portion may be a portion other than the highest point or the lowest point.

As described above, it is preferable that the support surface of the support member 22 and the supported surface of the sheet material 31 have the same height, but when the cut surface of the sheet material 31 has a height difference. Given that the cut surfaces are more rigid than when they are flat, cutting in the air is sufficiently possible even if the heights of these surfaces do not match. However, even in that case, the support surface of the support member 22 needs to be positioned along the punching blade 12. Therefore, the support member 22 has a contour shape along the contour of the punching blade 12.

Further, in the above embodiment, as a product punched from the sheet material, the tray 3 has a shape in which the cut surfaces on both side surfaces are the highest in the central portion and gradually decrease from the central portion toward the end portion. As illustrated, it is of course possible to punch out products of various shapes other than this. For example, as shown in FIGS. 14A and 14B, the tray 3 having a shape in which the cut surfaces on both side surfaces are the lowest in the central portion and gradually increase from the central portion toward the end portion, or FIGS. 15A and 15A and FIG. As shown in 15B, even if the tray 3 or the like has a shape in which the height of the cut surface changes periodically, the height of the support surface of the support member 22 corresponds to these shapes. By setting, it can be easily punched out.

Further, in the above-described embodiment, the configuration in which the elastic members 13 and 23 constituting the restraint member are made of urethane sponge has been described, but the present invention is not limited thereto. It is also possible to use natural rubber, synthetic rubber, springs and the like as the elastic members 13 and 23.

Further, in the above embodiment, the elastic members 13 and 23 directly sandwich the sheet material 31, but by attaching another member such as a plate to the tip of each elastic member, the elastic members 13 and 23 are the other. The sheet material 31 may be sandwiched between the members of the above.

Further, the restraint member may be composed of a member other than the elastic member. For example, the sheet material 31 may be restrained by piercing the sheet material 31 with a blade or a needle.

The punching device of the present invention is useful as a punching device for cutting a work material used for a tray made of synthetic resin or the like.

1 Punching blade type 11 Base 12 Punching blade 13 Elastic member 2 Receiving type 21 Base 22 Supporting member 22a Supporting surface 23 Elastic member 24 Through hole 3 Tray 3a Cutting surface 3b Supported surface 31 Sheet material

Claims (6)

In a punching device that punches products with different cut surface heights depending on the part from the sheet material
A punching blade type having a punching blade formed by bending a strip-shaped blade in an annular shape,
A receiving mold formed by bending a strip-shaped plate material in an annular shape and provided with a support member that supports the sheet material around the punching blade when the product is punched.
A restraining member for restraining the sheet material around the supporting member is provided.
The support member is formed so that the height of the support surface that supports the sheet material differs depending on the portion, and the plate material is bent so as to have a contour shape along the contour of the punching blade.
Punching device The heights of at least one portion of the supporting surface and the supported surface are the same.
The punching device according to claim 1. The height of the highest point of the supported surface coincides with the height of the highest point of the supported surface.
The punching device according to claim 2. The height of the lowest point of the supporting surface and the height of the lowest point of the supported surface match.
The punching device according to claim 2 or 3. The support member is formed so that the height of the support surface differs depending on the height of the supported surface.
The punching device according to claim 4. The restraining member is composed of elastic members formed on each of the punching blade mold and the receiving mold, and when the punching blade mold and the receiving mold are relatively close to each other, the elastic member forms the sheet. Hold the material,
The punching device according to any one of claims 1 to 5.