JP7064729B1 - Punching blade for sheet-shaped workpieces - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform long-term punching work by easily plastically deforming a base end portion of a punching blade at the time of blank punching so that the cutting edge height can be adjusted to be uniform while avoiding damage to the blade portion. Provides a punching blade for sheet-shaped workpieces. SOLUTION: A large number of notches are made in a tapered portion formed so as to gradually decrease in thickness toward a base end at a predetermined depth from the base end and at a predetermined interval in the longitudinal direction of a punching blade. Form. [Selection diagram] Fig. 3

Description

The present invention relates to a sheet-shaped work punching blade, which is provided in a mold of a sheet-shaped work punching device such as a paper container, cardboard, and a plastic sheet, and punches a product sheet having a predetermined shape from the sheet-shaped work.

Conventionally, in the above-mentioned sheet-shaped work punching device, from the sheet-shaped work to the product sheet in the grooves formed corresponding to the outer shape, cuts and creases of the product sheet in the flat plate-shaped wooden mold called Thomson wooden mold. A punching blade made of a strip steel plate and a similar ruled line blade forming a crease are fitted and held, and the flat plate-shaped wooden mold is placed on the lower surface of the upper platen (platen) of the punching device with respect to the cutting edge of the punching blade. A metal plate and thick paper are provided and attached as needed, and the upper platen and the lower platen are moved toward each other and the flat platen is placed on the lower platen (face plate). A product sheet in which a notch is formed by a punching blade or a notch is formed by pressure contacting the sheet-shaped workpiece, and at the same time, a crease line is formed in the product sheet by a ruled line blade.

However, there is unevenness in the cutting edge height due to variations in the parallelism and flatness of the upper and lower platens and the height of the punching blade. On the other hand, a part of the cutting edge was excessively pressed and damaged, and the product sheet could not be reliably punched out from the sheet-like work. In particular, in the case of a punching blade whose part is pushed and bent according to the corner portion, the bent portion is compressed in the height direction and the cutting edge height becomes lower than the cutting edge height of the non-bending portion, and the lower platen is used. On the other hand, the cutting edge of the non-bent part was excessively pressed and easily damaged.

In addition, when punching in a state where the punching blades are unevenly distributed in a plane with respect to the flat plate-shaped wooden mold, the peripheral portion of the flat plate-shaped wooden mold is slightly bent with respect to the central portion due to insufficient rigidity of the punching device and the upper platen. As a result, the height of the cutting edge becomes uneven due to the curved shape, and there is a risk that cutting defects such as uncut parts may occur or the cutting edge may be damaged.

In order to avoid the above-mentioned cutting defects and damage to the punching blade, unevenness removal work is appropriately performed to finely adjust the contact condition of the cutting edge of the punching blade against the lower platen prior to the punching work, and punching is performed against the lower platen during the punching work. It is necessary to adjust the height of the cutting edge so that the cutting edge of the blade is pressed evenly.

In this unevenness removal work, the upper and lower platens are moved so that they are close to each other, and the product sheet is tried out from the sheet-shaped workpiece to check for punching defects. The height is adjusted by interposing a spacer such as one or more sheets of paper tape between the base end of the blade and the upper platen to avoid cutting defects and damage to the punching blade. It takes a long time and has a problem that the punching work efficiency is deteriorated.

In order to solve the above problem, a punching blade shown in Patent Document 1 has been proposed. The punching blade is made of a strip steel plate having a blade portion at the tip and a back portion at the rear end portion, and the back portion has a tapered shape that gradually narrows toward the rear end. By plastically deforming the tapered back due to pressure contact (collision) of the blade with respect to the lower platen during striking, unevenness removal work is performed while preventing excessive damage to the blade.

However, the punching blade is made of a strip-shaped steel plate having hardness in order to secure a predetermined number of punching times, but in order to plastically deform the back part at the time of blank punching, the back part is plastically deformed with respect to the lower platen. It was necessary to press with the force possible, and it was not possible to avoid damaging the cutting edge due to the pressing force at that time.

Japanese Unexamined Patent Publication No. 2005-297163

The problem to be solved is that when paper tape is inserted between the upper platen and the flat plate-shaped wooden mold to remove unevenness, the adjustment work takes time and effort, and the punching work efficiency deteriorates. be.

Further, when the rear end portion of the punching blade is formed in a tapered shape so as to be plastically deformable to avoid damage to the punching blade, damage to the blade portion cannot be effectively avoided by the force of plastically deforming the back portion. At the point.

INDUSTRIAL APPLICABILITY The present invention is a punching blade of a sheet-shaped work made of a strip steel plate in which a blade portion is machined at the tip portion and the base end side abuts on the surface plate of the punching device and movement is restricted. At the same time, the base end portion is formed with a tapered portion whose thickness gradually decreases toward the base end, and the tapered portion has a depth of 0.05 to 3 mm from the base end and a longitudinal width of 0. The most important feature is the formation of a large number of notches with an arrangement interval of 1 to 5 mm and an arrangement interval of 4 to 130 / inch with respect to the longitudinal direction of the tapered portion .

INDUSTRIAL APPLICABILITY According to the present invention, the base end portion of the punching blade can be easily plastically deformed at the time of blank punching so that the cutting edge height can be adjusted to be uniform while avoiding damage to the cutting edge portion, and long-term punching work can be performed. to enable.

It is a perspective view from the bottom of the flat plate-shaped wooden mold attached to the sheet-shaped work punching device. It is a flat plate-shaped wooden mold attached to a surface plate, and is a vertical cross-sectional view corresponding to the line AA in FIG. It is a perspective view which shows a part of a punching blade. It is a partially enlarged sectional view which shows the modification example of a taper part. It is a partially enlarged sectional view which shows the modification example of a taper part. It is explanatory drawing which shows the one-sided contact state of a punching blade with respect to a face board. It is explanatory drawing which shows the plastic deformation state of a taper part.

The tapered portion of the base end has a depth of 0.05 to 3 mm from the base end, a width in the longitudinal direction of 0.1 to 5 mm, and a large number of arrangement intervals of 4 to 130 / inch with respect to the longitudinal direction of the tapered portion. The best form is to form a notch.

Hereinafter, the punching blade of the sheet-shaped workpiece according to the present invention will be described with reference to the drawings.
First, as shown in FIGS. 1 and 2, the outline of the flat plate-shaped wooden mold 1 mounted on the sheet-shaped work punching device (not shown) will be described. Grooves 3 are formed corresponding to the outer shape, cuts, and creases of the product sheet (not shown) punched out from a sheet-like work such as a plastic sheet. The punching blade 5 according to the present invention is fitted so as to protrude from the front surface (lower surface) of the flat plate-shaped wooden mold 1 at a predetermined cutting edge height.

Further, the ruled line blade 7 is fitted in the groove 3 corresponding to the crease so as to protrude from the front surface of the flat plate-shaped wooden mold 1 at a height slightly lower than the protruding height of the punching blade 5. Since the ruled line blade 7 is not directly related to the present invention, the details thereof will be omitted.

An elastic body 9 (indicated by a one-point chain line) such as a sponge having a height protruding from the cutting edge of the punching blade 5 is provided on the lower surface of the flat plate-shaped wooden mold 1 along both side surfaces of the punching blade 5. 9 is elastically deformed by being pressed against the face plate 13 as the platen 11 is lowered, which will be described later, so that the cutting edge of the punching blade 5 can collide with the face plate 13 when punching or blank punching the product sheet from the sheet-like work. The height of the cutting edge of the punching blade 5 in the above can be adjusted.

The flat plate-shaped wooden mold 1 is restricted from moving by contacting the base end of the punching blade 5 with the front surface (lower surface) of the metal surface plate (upper platen) 11 via a metal plate or the like as necessary. It can be installed in the state. Then, when punching the product sheet from the sheet-shaped work or when punching blank prior to the punching process, the surface plate 11 on which the flat plate-shaped wooden mold 1 is set is moved toward the face plate 13 arranged below the punching blade 5. The cutting edge is moved by a (collision) stroke that presses against the upper surface of the face plate 13.

As shown in FIG. 3, the punching blade 5 is made of, for example, a strip-shaped steel plate having a height of 23.6 mm and a thickness of 0.7 mm, and a predetermined cutting edge height and cutting edge angle (for example, from 40 ° to 40 ° to the tip portion thereof). The blade portion 5a (50 °) has a predetermined taper angle (for example, 10 ° to 20 °) and a length at the base end portion, and the thickness gradually decreases and the base end surface thickness is 0 to 0.6 mm. The tapered portion 5b is formed. The taper angle and the base end surface thickness of the tapered portion 5b are arbitrarily selected according to the plastic deformation characteristics of the punching blade 5.

The base end surface thickness is a value when the blade thickness of the punching blade 5 is 0.7 mm, but when the blade thickness is 0.9 mm, the base end surface thickness is 0 to 0.8 mm and the blade thickness is 1. For 0.4 mm, the base end surface thickness may be selected in the range of 0 to 1.3 mm.

Further, as the tapered portion 5b, in addition to the linear shape in which the thickness gradually decreases toward the base end shown in the drawing, the thickness gradually decreases toward the base end as shown in FIG. The shape may be any of the shapes, as shown in FIG. 5, in which the thickness gradually decreases toward the base end in a stepped manner.

The height and thickness of the punching blade 5 are not limited to the above, and the thickness of the sea-shaped work to be punched and the number of laminated sheet-shaped works (the sea-shaped work punched by one punching operation). It is arbitrarily selected according to the number of sheets).

The tip portion of the punching blade 5 including the blade portion 5a is quenched by high-frequency heating or the like to increase its hardness. On the other hand, the base end portion including the tapered portion 5b is not quenched, has a lower hardness than the tip portion, and has metal properties that are easily plastically deformed.

A large number of notches 15 are formed in the tapered portion 5b at predetermined intervals in the longitudinal direction. Each notch 15 has, for example, a depth (depth from the base end) of 0.05 to 3 mm and a longitudinal width of 0.1 to 5 mm, and has an arrangement number of 4 to 130 / inch with respect to the longitudinal direction. Formed at intervals.

The taper angle and length of the tapered portion 5b, the thickness of the base end surface, the depth of the notch 15 formed in the tapered portion 5b, the width in the longitudinal direction, and the number of pieces per unit are determined by the plastically deformable force of the tapered portion 5b. It is appropriately set within a range that is higher than the shearing force for the sheet-shaped work and lower than the damageable force of the cutting edge.

Next, when the product sheet is punched from the sheet-shaped work using the flat plate-shaped wooden mold 1, the sheet-shaped work is not placed on the face plate 13 of the punching device prior to the punching work. The surface plate 11 on which the flat plate-shaped wooden mold 1 is mounted is moved toward the face plate 13, and the cutting edge of the punching blade 5 is pressed against the upper surface of the face plate 13 to perform blank punching work for removing unevenness. When the flat plate-shaped wooden mold 1 is attached to the surface plate 11, the base end surface of the tapered portion 5b in the punching blade 5 fitted in the groove 3 of the flat plate-shaped wooden mold 1 abuts on the front surface of the surface plate 11. It is in a state.

The blank punching operation is performed on the surface plate 11 or as shown in FIG. 6 (FIG. 6 shows a state in which the non-bent portion of the punching blade 5 whose height is lowered by bending is pressed against the face plate 13). If the parallelism and flatness of the face plate 13 and the height of the punching blade 5 are slightly different, and if the punching blade 5 is unevenly distributed on the flat plate-shaped wooden mold 1, the surface plate 11 or This is done in order to prevent the pressing force of the punching blade 5 against the face plate 13 from becoming uneven due to the rigidity of the face plate 13 and the like, and to prevent damage to the cutting edge and punching defects during punching work.

In this blank striking work, if there is an uneven height in which a part of the blade portion 5a is excessively pressed against the upper surface of the face plate 13, as shown in FIG. 7, the blade edge is pressed against the face plate 13. Along with this, the punching blade 5 corresponding to the excessively pressed portion is plastically deformed by being compressed by the force corresponding to the excessive pressing of the tapered portion 5b. At that time, since a large number of notches 15 are formed in the tapered portion 5b to further weaken the tapered portion 5, the tapered portion 5b can be reliably plastically deformed before the blade portion 5a is damaged.

The entire punching blade 5 is constant because the height of the cutting edge of the punching blade 5 at the portion excessively pressed against the face plate 13 due to the plastic deformation of the tapered portion 5b is lowered so as to match the height of the cutting edge at other locations. It is adjusted to the height of the cutting edge of.

As a result, during the blank punching operation, the cutting edge height of the entire punching blade 5 is prevented from being damaged by the excessive pressing force acting on the blade portion 5a due to the plastic deformation of the tapered portion 5b weakened by the notch 15. In the actual punching process, the product sheet can be reliably punched from the sheet-like work, and excellent sharpness can be maintained for a long period of time.

1 Flat wooden mold 3 Groove 5 Punching blade 5a Blade part 5b Tapered part 7 Ruled line blade 9 Elastic body 11 Surface plate 13 Surface plate 15 Notch

Claims (4)

It is a punching blade of a sheet-shaped work made of strip steel plate whose tip is machined and whose base end side abuts on the surface plate of the punching device and is restricted in movement.
The above blades are quenched and at the same time
The base end portion is formed with a tapered portion whose thickness gradually decreases toward the base end.
The tapered portion has a large number of notches having a depth of 0.05 to 3 mm from the base end, a longitudinal width of 0.1 to 5 mm, and an arrangement interval of 4 to 130 / inch with respect to the longitudinal direction of the tapered portion. The punching blade of the sheet-like work to which is formed. In claim 1,
The tapered portion is a punching blade for a sheet-shaped workpiece having a linear inclined surface whose thickness gradually decreases toward the base end. In claim 1,
The tapered portion is a punching blade for a sheet-shaped workpiece having a curved inclined surface whose thickness gradually decreases toward the base end. In claim 1,
The tapered portion is a punching blade for a sheet-shaped workpiece whose thickness gradually decreases toward the base end.

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