JP2005297163A - Punching blade - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize damage of the blade tip generated in idle driving for absorbing nonuniformity of the height of a blade or nonuniformity of the height of a punching device. <P>SOLUTION: This belt-like punching blade 1 is formed by arranging a back part 3 applied to a metallic plate (a steel plate 102) on the rear end side by processing a blade part 2 on the tip; and enhances strength by increasing the volume of a tip part of the blade by forming the blade part 3 as a two-stage blade; and reduces deformation of the blade tip 21 in idle driving by forming a structure for easily plastically deforming the back part 3 to the blade tip 21 by processing the back part 3 side of the punching blade 1 in a tapered shape of reducing in the thickness toward the rear end. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a strip-shaped punching blade used for punching paper containers, cardboard, plastic sheets and the like. Note that the punching blade of the present invention includes a strip-shaped blade (half-cut blade) for half-cutting paper containers and plastic sheets.

  As a method of punching and half-cutting, a die board such as a plywood is subjected to grooving according to the punching pattern (for example, the unfolded shape of the paper container), and a strip-shaped punching blade is fitted into the processed groove. An embedded die (die) is manufactured, and this die is attached to a punching device (pressing machine) or the like, and a punching process or half-cutting of a paper container or a plastic sheet is performed (for example, patent document) 1 and Patent Document 2).

In punching, etc., before performing actual punching, blanking is performed several tens to several hundreds of times, and the back of the punching blade is plastically deformed, resulting in uneven punching blade height or punching device height unevenness. Pretreatment is performed to absorb
Japanese Utility Model Publication No. 06-050799 JP 2001-293696 A

  By the way, when performing the above-mentioned pretreatment (blank driving), the cutting edge of the punching blade collides with a steel or stainless steel face plate (platen), and the cutting edge is damaged. As a result, there is a problem that the sharpness of the blade is deteriorated at the time of actual punching, for example, the generation of paper dust is accelerated.

  In order to solve such problems, that is, to prevent damage to the cutting edge during blanking, increase the hardness of the cutting edge by increasing the hardness of the blade tip so that the deformation when the cutting edge collides with the face plate is reduced. However, there is a limit to increasing the hardness of the tip of the blade.

  The present invention has been made in view of such circumstances, and it is possible to reduce as much as possible damage to the blade edge that occurs during blanking to absorb unevenness in blade height or unevenness in the punching device. The object is to provide a punching blade.

  The punching blade of the present invention is a strip-shaped punching blade in which a blade portion is processed at the front end and a back portion is provided on the rear end side against a metal plate (for example, a steel plate), and the blade portion has a plurality of different blade angles. The blade surface is formed, and the back side of the punching blade is processed into a taper shape whose thickness decreases toward the rear end.

  According to the punching blade of the present invention, the back portion is tapered so that the thickness decreases toward the rear end, and the back portion of the punching blade is easily deformed plastically with respect to the cutting edge. At the time of blanking performed before the cutting, the back portion is plastically deformed earlier than the cutting edge, and the deformation of the cutting edge at the time of blanking can be reduced.

  Furthermore, in the punching blade of the present invention, the blade portion is a blade having a plurality of blade surfaces with different blade angles (two-stage blade), so that the blade angle at the blade tip is set to a large angle (for example, 50 to 60 °). This makes it possible to increase the volume of the tip of the blade. Thereby, when the cutting edge hits the face plate at the time of blanking, strength can be given so that the cutting edge is not deformed, and the deformation of the cutting edge at the time of blanking can be further reduced. In addition, since the blade portion is a two-stage blade, it is possible to easily perform processing such as polishing only the tip portion of the blade and reducing the surface roughness of only the tip portion of the blade. Even when the blade angle of the blade edge is set to a large angle (for example, 50 to 60 °), excellent sharpness can be ensured.

  Here, in the punching blade according to the present invention, the surface roughness of the blade surface of the blade portion (the blade surface 22 shown in FIG. 2) is preferably 0.06 to 0.15 μm Rz. By adopting such a configuration, excellent sharpness can be maintained for a long period of time.

  The punching blade of the present invention is a strip-shaped punching blade in which a blade portion is processed at the tip, and a back portion is provided on the rear end side against a metal plate (for example, a steel plate), and the blade tip of the blade portion has a curved shape. In addition to being processed, the back side of the punching blade is characterized by being processed into a tapered shape whose thickness decreases toward the rear end.

  According to the punching blade of the present invention, the back portion is tapered so that the thickness decreases toward the rear end, and the back portion of the punching blade is easily deformed plastically with respect to the cutting edge. At the time of blanking performed before the cutting, the back portion is plastically deformed earlier than the cutting edge, and the deformation of the cutting edge at the time of blanking can be reduced.

  Furthermore, in the punching blade of the present invention, the tip of the blade portion is processed into a curved surface shape by polishing or the like, and the volume of the tip portion of the blade is increased so that the blade tip does not deform when hitting the face plate during blanking. It is possible to give a strong strength. As a result, the deformation of the cutting edge during idle driving can be further reduced. In the punching blade of the present invention, it is possible to ensure an excellent sharpness while increasing the tip of the blade by preventing grinding traces from being generated when grinding the blade tip into a curved surface by polishing. it can.

  In the punching blade of the present invention, the taper angle of the taper shape on the back side is preferably 10 to 30 °, and the thickness of the back end face is preferably 0.1 to 0.35 mm. By adopting such a shape and dimension, the back portion surely plastically deforms before the cutting edge at the time of blanking, so that damage to the cutting edge can be surely prevented. Furthermore, excessive plastic deformation of the back portion can be prevented, and pressure adjustment processing during actual punching after blanking can be reduced.

  According to the punching blade of the present invention, the blade portion has a two-stage blade, or the blade tip of the blade portion has a curved shape to increase the volume of the tip of the blade, and the portion on the back side becomes thicker toward the rear end. As the taper shape is reduced, the back of the punching blade has a structure that is easily plastically deformed with respect to the cutting edge.Therefore, the back part is plastically deformed before the cutting edge when blanking is performed before actual punching is performed. As a result, the deformation of the cutting edge at the time of idle driving can be reduced, and damage to the cutting edge can be suppressed. As a result, it is possible to maintain an excellent sharpness for a long time at the time of actual punching processing, and to solve the conventional problem that paper dust is quickly generated, for example.

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

<Embodiment 1>
FIG. 1 is a cross-sectional view showing an example of the punching blade of the present invention. FIG. 2 is an enlarged view of the blade portion of the punching blade of FIG.

  The punching blade 1 of this example is a steel band blade (double-edged blade) used for a punching die 100 (see FIG. 3), the blade portion 2 is processed at the tip, and the back portion 3 at the rear end. Is provided. The tip of the punching blade 1 has increased hardness by heat treatment such as quenching.

  In the punching blade 1 of this example, the blade portion 2 is a two-stage blade having two blade surfaces 22 and 23 having different blade angles, and the blade angle 21 of the blade tip 21 is increased to increase the tip of the blade. The point that the volume is increased and the taper shape in which the thickness decreases toward the rear end of the portion on the back portion 3 side, and the back portion 3 of the punching blade 1 has a structure that is easily plastically deformed with respect to the cutting edge 21. There is a feature.

  In the punching blade 1 shown in FIGS. 1 and 2, the dimensions of each part are, for example, a plate thickness t of 0.71 mm, a blade angle θ1 of the blade edge 21 of 50 ° or 60 °, and an angle θ2 of the blade portion 2. Is 42 °, and the height h of the blade angle θ1 portion is 0.15 mm. Further, the taper angle α of the tapered shape on the back portion 3 side is 16 °, and the thickness te of the rear end surface is 0.15 mm.

  As shown in FIG. 3, the punching blade 1 having the above structure is fitted into a groove 101 a formed in a die board 101 such as a plywood plate, and is a steel plate (surface plate) disposed on the back side (upper surface side) of the die board 101. It is set with the back 3 in contact with 102. By fitting the punching blade 1 into the die board 101 in this way, a punching die (upper die) 100 of a punching device (not shown) can be manufactured.

  Next, when punching is performed using the above punching die 100, blank punching is first performed without setting a workpiece such as a paper sheet or a plastic sheet in a punching device (not shown), and the punching blade 1 The cutting edge 21 is applied to a face plate (platen such as a steel plate) 103 to perform preprocessing for eliminating unevenness in the height of the punching blade 1 and unevenness in the punching device.

  Here, in the punching blade 1 of this example, the back portion 3 side is tapered so that the back portion 3 of the punching blade 1 is easily plastically deformed with respect to the cutting edge 21. In this case, the back portion 3 is plastically deformed earlier than the cutting edge 21 of the punching blade 1, so that the deformation of the cutting edge 21 at the time of blanking can be reduced, and damage to the cutting edge 21 can be suppressed. As a result, it is possible to maintain an excellent sharpness for a long period of time during actual punching processing, and to solve the problem of, for example, the early generation of paper dust.

  Further, in the punching blade 1 of this example, the blade angle 21 of the blade edge 21 is set to a large angle (for example, 50 to 60 °), and the volume of the tip portion of the blade is increased. In this case, it is possible to give the strength that the blade edge 21 is not deformed. As a result, it is possible to further reduce the deformation of the cutting edge 21 during idle driving.

  In the punching blade 1 of FIG. 1, if the surface 21 of the blade 21 is mirror-polished and the surface roughness of the blade surface 22 of the blade 21 is made fine, the above-described damage at the time of blanking of the blade 21 is reduced. In addition to the effect, it becomes possible to maintain an excellent sharpness for a long time during actual punching. In this case, the surface roughness of the blade surface (polishing surface) 22 of the blade edge 21 is preferably 0.06 to 0.15 μm Rz.

<Embodiment 2>
FIG. 4 is a sectional view showing another example of the punching blade of the present invention. FIG. 5 is an enlarged view of the blade portion of the punching blade of FIG.

  The punching blade 11 in this example is a steel band blade (both blades) used for a punching die 100 (see FIG. 6), the blade portion 12 is processed at the tip, and the back portion 13 at the rear end. Is provided. In addition, the hardness of the tip portion of the punching blade 11 is increased by heat treatment such as quenching.

  In the punching blade 11 of this example, the tip of the blade of the blade 12 is curved (R-shaped) to increase the volume of the tip of the blade, and the portion on the back 13 side is the rear end. The taper shape whose thickness decreases as it goes is characterized in that the back portion 13 of the punching blade 11 is easily plastically deformed with respect to the blade edge 121.

  In the punching blade 11 shown in FIGS. 4 and 5, the dimensions of each part are, for example, a thickness t of 0.71 mm, a radius r of the curved surface shape of the blade edge 121 is 0.02 mm, and an angle θ2 of the blade part 12. Is 42 °, and the height h of the curved portion is 0.02 mm. In addition, the taper angle α of the taper shape on the back portion 13 side is 16 °, and the thickness te of the rear end surface is 0.15 mm.

  As shown in FIG. 6, the punching blade 11 having the above structure is fitted into a groove 101 a formed in a die board 101 such as a plywood plate, and is a steel plate (surface plate) 102 disposed on the back side (upper side) of the die board 101. Is set with the back portion 13 in contact with it. By fitting the punching blade 11 into the die board 101 in this way, a punching die (upper die) 100 of a punching device (not shown) can be manufactured.

  Next, when punching is performed using the above punching die 100, blank punching is first performed without setting a work such as a paper sheet or a plastic sheet in a punching device (not shown), and the punching blade 11 The cutting edge 121 is applied to a face plate (platen such as a steel plate) 103 to perform pre-processing for eliminating unevenness in the height of the punching blade 11 and unevenness in the punching device.

  Here, in the punching blade 11 of this example, the back portion 13 side is tapered so that the back portion 13 of the punching blade 11 is easily plastically deformed with respect to the cutting edge 121. In this case, the back portion 13 is plastically deformed earlier than the cutting edge 121 of the punching blade 11, so that the deformation of the cutting edge 121 during idle driving can be reduced, and damage to the cutting edge 121 can be suppressed. As a result, it is possible to maintain an excellent sharpness for a long period of time during actual punching processing, and to solve the problem of, for example, the early generation of paper dust.

  Furthermore, in the punching blade 11 of this example, the blade edge 121 of the blade portion 12 is processed into a curved shape by polishing or the like to increase the volume of the tip portion of the blade, so that when the blade edge 121 hits the face plate 103 during blanking In addition, it is possible to provide strength that does not cause deformation. As a result, it is possible to further reduce the deformation of the blade edge 121 during idle driving.

  In the punching blade 11 of FIG. 3, by preventing grinding marks from being generated when the tip of the blade is processed into a curved shape by polishing, the above-described damage reduction effect when the blade edge 121 is blanked is reduced. In addition, it is possible to maintain an excellent sharpness for a long time during actual punching.

  INDUSTRIAL APPLICABILITY The present invention can be effectively used for a punching blade used for punching paper containers, cardboard, plastic sheets and the like.

It is sectional drawing which shows an example of the punching blade of this invention. It is an enlarged view of the blade part of the punching blade of FIG. It is sectional drawing which shows the punching blade of FIG. 1 in a use condition. It is sectional drawing which shows the other example of the punching blade of this invention. It is an enlarged view of the blade part of the punching blade of FIG. It is sectional drawing which shows the punching blade of FIG. 4 in a use condition.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,11 Punching blade 2,12 Blade part 21,121 Blade edge 22,23 Blade surface 3,13 Back part 100 Punching die 101 Die board 102 Steel plate 103 Face plate

Claims (4)

  A blade-shaped punching blade in which a blade portion is processed at the front end and a back portion is provided on the rear end side to contact the metal plate, and the blade portion is formed with a plurality of blade surfaces having different blade angles, A punching blade characterized in that the back side of the punching blade is processed into a tapered shape whose thickness decreases toward the rear end.   The punching blade according to claim 1, wherein the surface roughness of the blade surface of the blade portion is 0.06 to 0.15 μm Rz.   A blade-shaped punching blade in which a blade portion is processed at the front end and a back portion is provided on the rear end side to contact the metal plate, and the blade tip of the blade portion is processed into a curved shape, and the back portion of the punching blade A punching blade characterized in that the side is processed into a tapered shape whose thickness is reduced toward the rear end. The taper angle of the taper shape on the back side is 10 to 30 °, and the thickness of the back end face is 0.1 to 0.35 mm. Punching blade.

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