JP6949294B1 - Lower blade and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lower blade capable of easily separating thread-like cutting chips generated when a sheet material such as a corrugated cardboard sheet is cut, and a method for manufacturing the lower blade. SOLUTION: A receiving blade (cutting blades 1a, 1b) used as a lower blade in a cutting device for cutting a corrugated sheet having a core between a pair of liners by the cooperation of an upper blade and a lower blade. The lower blade is formed in a ring shape and includes a blade portion 3 arranged along the outer peripheral portion thereof. A rough surface portion 5 composed of minute irregularities is formed, and the maximum height Sz of the rough surface portion 5 is in the range of 10 μm or more and 400 μm or less. A lower blade characterized in that cutting debris can be separated from between a pair of liners by contact with 5. [Selection diagram] FIG. 13

Description

The present invention relates to a lower blade and a method for manufacturing the lower blade. In particular, the present invention relates to a lower blade for cutting a corrugated cardboard sheet having a core between a pair of liners by cooperation between the upper blade and the lower blade, and a method for manufacturing the lower blade.

As a packaging box for storing or moving an object, a corrugated cardboard box manufactured by assembling a corrugated cardboard sheet 100 as shown in FIG. 15 is known. The top lid and bottom plate of the corrugated cardboard box are formed by forming a slit 101 in a part of the corrugated cardboard sheet 100 and folding the separated portions so as to overlap each other.

A grooving device is generally used for forming the slit 101, and a cutting tool 60 as shown in FIG. 16 is often used for this grooving device (for example, the conventional method of Patent Document 1). See technology).

In the cutting blade 60, the cutting generation blade 62 and the cutting blade 63 are integrally formed on the blade main body 61 formed in a fan shape. The cut generation blade 62 projects radially outward from one end of the outer peripheral surface of the blade body 61 so as to be flush with the end surface of the blade body 61, and has corners 64 on both sides in the width direction of the end surface. There is. The cutting blades 63 are provided on both sides of the blade body 61 in the thickness direction along the outer peripheral surface of the blade body 61.

The cutting edge 60 is attached to the grooving device 70 as shown in FIGS. 17 and 18. FIG. 17 is a side view showing a schematic configuration of a grooving device, and FIG. 18 is a front view. Two blades 60 for cutting are attached to the grooving device 70 as upper blades, and the configuration of the grooving device 70 will be described below with the respective blades as blades 60a and 60b for cutting.

The grooving device 70 includes an upper rotating shaft 71 and a lower rotating shaft 72. The upper rotating shaft 71 and the lower rotating shaft 72 are arranged in parallel with each other so as to face each other with the sheet feeding line L interposed therebetween, and a pair of disk-shaped upper rotating holders 73 and 73 and a pair of lower sides, respectively. It includes rotating holders 74 and 74.

Two cutting blades 60a and 60b, which are upper blades, are sandwiched between the pair of upper rotary holders 73 and 73 by fasteners (not shown) such as bolts, respectively. The cutting blades 60a and 60b are spaced apart from each other along the outer periphery of the pair of rotary holders 73 and 73 so that the cut generation blades 62a and 62b face each other along the outer peripheral direction. It is attached. On the other hand, on the facing surfaces of the pair of lower rotary holders 74, 74, the two lower blades 75, 75 are slightly wider than the thickness dimensions of the cutting blades 60a and 60b. It can be installed at a set interval. The receiving blades 75, 75 are blades formed in a ring shape, and a blade portion is formed on the outer peripheral portion thereof. The ring-shaped receiving blades 75, 75 may be configured as a receiving blade by using a single ring-shaped cutting blade, or, for example, a semi-ring-shaped cutting blade may be placed below. Two side rotation holders 74 and 74 may be installed to form a ring-shaped receiving blade. Further, a ring-shaped receiving blade may be formed by installing a plurality of fan-shaped cutting blades on the lower rotary holders 74 and 74.

Next, a method of forming a slit in the corrugated cardboard sheet 50 by using the grooving device 70 having the above configuration will be described. As shown in FIG. 17, in a state where the upper rotating holders 73, 73 and the lower rotating holders 74, 74 are rotated, the corrugated cardboard sheet 100 is placed along the sheet feeding line L of the grooving device 70 in FIG. It is fed to the grooving device 70 from the right side. As a result, the cutting blade 60a, which is the upper blade, is sandwiched between the gaps between the receiving blades 75, 75, which are the lower blades, and the corrugated cardboard sheet 100 is cut. The front slit 101 is formed. Similarly, the other cutting blade 60b is sandwiched between the receiving blades 75 and 75, the corrugated cardboard sheet 100 is cut, and the rear slit 101 starting from the start end portion 103 is formed.

Japanese Unexamined Patent Publication No. 9-39118

However, when slitting is performed using a conventionally used cutting blade, there is a problem that thin thread-like (whisker-like) cutting chips remain inside the cut surface on the corrugated cardboard sheet 100 side. .. Specifically, FIGS. 19 (a) to 19 (e) showing a process when the corrugated cardboard sheet is cut with a cutting blade will be described. FIG. 19A is a view immediately before the corrugated cardboard sheet 100 is sandwiched between the upper blade cutting blade 62a (62b) and the lower blade receiving blade 75 (cutting blade), and is the upper blade cutting. From this state, the processing blades 62a (62b) crush the corrugated cardboard sheet 100 from above toward between the lower blades 75 and 75 as shown in FIG. 19B. At this time, as shown in FIG. 19B, when the corrugated cardboard sheet 100 is crushed, the stepped top portion of the core 100c is deformed flatly, and when the corrugated cardboard sheet 100 is further crushed, the side surface portion of the stepped top portion is deformed into an S shape to form the core. An overlapping portion Z is formed on 100c. Then, as shown in FIG. 19C, the cutting blade 62a (62b), which is the upper blade, further crushes the corrugated cardboard sheet 100 from above, and the liner 100a of the corrugated cardboard sheet 100 is the upper blade. It is cut by the blades 62a (62b), and the liner 100b of the corrugated cardboard sheet 100 is cut by the receiving blade 75 which is a lower blade. Then, as shown in FIG. 19D, the overlapping portion Z of the corrugated cardboard sheet 100 is sandwiched between the cutting blade 62a (62b) which is the upper blade and the receiving blade 75 which is the lower blade, whereby the corrugated cardboard sheet 100 The overlapping portion Z is sheared by the cutting blade 62a (62b) which is the upper blade and the receiving blade 75 which is the lower blade, and the corrugated cardboard sheet 100 is cut. As a result, as shown in FIG. 19E, the overlapped portion Z of the cut core 100c is separated from the slit waste 104 and formed as a thin thread-like piece of paper (cutting waste 110a), and the cutting waste 110a is corrugated cardboard. It will remain on the sheet 100 side. That is, the overlapping portion Z is separated from the cutting waste 110b on the slit waste 104 side to become the cutting waste 110a, and remains sandwiched between the liners 100a and 100b of the corrugated cardboard sheet 100.

Here, when the cutting waste 110a becomes thin, as shown in FIG. 20, the cutting waste 110a easily protrudes from between the liners 100a and 100b. Then, if the cutting waste 110a is carried to the next process while remaining on the corrugated cardboard sheet 100 and becomes a corrugated cardboard box as a final product, the quality of the corrugated cardboard box naturally deteriorates. Further, when an item is packed or sealed in a cardboard box in which such thin cutting chips 110a are not completely separated in the boxing process, the cutting chips 110a fall into the inside of the box due to vibration or impact during these processes. It ends up. That is, the cutting waste 110a is mixed into the packaged item. It is not permissible for the cutting chips 110a to be mixed into the products to be packaged in this way, especially for products such as foods for the purpose of cleanliness.

The present invention has been made to solve such a problem, and is a lower blade capable of easily removing thread-like cutting chips generated when a sheet material such as a corrugated cardboard sheet is cut, and a method for manufacturing the lower blade. The purpose is to provide.

The object of the present invention is a lower blade used in a cutting device for cutting a corrugated cardboard sheet having a core between a pair of liners in cooperation with the upper blade and the lower blade. It is configured in a ring shape and includes a blade portion arranged along the outer peripheral portion thereof, and a rough surface portion composed of minute irregularities is formed on the side surface of the blade portion and a region including the blade edge of the blade portion. The maximum height Sz of the rough surface portion is in the range of 10 μm or more and 400 μm or less, and between the pair of liners due to contact between the thread-like cutting chips formed in the cutting process based on the core and the rough surface portion. This is achieved by a lower blade characterized in that the cutting debris can be detached from the surface.

Further, in the lower blade, it is preferable that the rough surface portion is formed so as to form a strip having the same width along the circumferential direction of the blade portion.

Further, it is preferable that the rough surface portion is formed by blasting the side surface of the blade portion. Further, it is preferable that the rough surface portion is formed in the entire circumferential direction of the blade portion. Further, the ring-shaped lower blade may be formed by combining two cutting blades formed in a semi-ring shape, or by combining a plurality of cutting cutting blades formed in a fan shape. You may.

The object of the present invention is a lower blade used in a grooving device for forming a slit in a corrugated cardboard sheet having a core between a pair of liners in cooperation with the upper blade and the lower blade. The lower blade is formed in a ring shape and includes a blade portion arranged along the outer peripheral portion thereof, and is composed of minute irregularities on the side surface of the blade portion including the cutting edge of the blade portion. A rough surface portion is formed, and the maximum height Sz of the rough surface portion is in the range of 10 μm or more and 400 μm or less. This is achieved by a lower blade characterized in that the cutting debris can be separated from between the pair of liners.

It is preferable that the lower blade is formed so as to form a strip having the same width along the circumferential direction of the blade portion.

Further, it is preferable that the rough surface portion is formed by blasting the side surface of the blade portion. Further, it is preferable that the rough surface portion is formed in the entire circumferential direction of the blade portion. Further, the ring-shaped lower blade may be formed by combining two cutting blades formed in a semi-ring shape, or by combining a plurality of cutting cutting blades formed in a fan shape. You may.

Further, the object of the present invention is used in a cutting device for cutting a corrugated cardboard sheet having a core between a pair of liners in cooperation with an upper blade and a lower blade, and the core formed in the cutting process. A method for manufacturing a lower blade capable of separating the thread-shaped cutting chips from between the pair of liners based on the above, and the side surface of the blade portion arranged along the outer peripheral portion of the lower blade formed in a ring shape. The present invention is characterized in that the region including the cutting edge of the blade portion is provided with a rough surface portion forming step for forming a rough surface portion composed of minute irregularities having a maximum height Sz in the range of 10 μm or more and 400 μm or less by blasting. It is achieved by the manufacturing method of the lower blade.

In this method for manufacturing the lower blade, it is preferable that silica sand or a metal piece having an average particle size of 300 μm or more and 1.1 mm or less, more preferably 500 μm or more and 900 μm or less is sprayed on the side surface of the blade portion in the blasting process. ..

Further, in the rough surface portion forming step, it is preferable to blast the rough surface portion so as to form a strip-shaped rough surface portion having the same width along the circumferential direction of the blade portion.

Further, in the rough surface portion forming step, it is preferable to perform blasting so as to form the rough surface portion in the entire circumferential direction of the blade portion.

According to the present invention, it is possible to provide a lower blade and a method for manufacturing the lower blade, which can easily remove cutting chips of threads generated when a sheet material such as a corrugated cardboard sheet is cut.

It is a top view of the blade for cutting processing which concerns on one Embodiment of this invention. It is an enlarged view in the cross section AA of FIG. FIG. 3 is an enlarged plan view of a main part showing a modified example of a grooving blade in the cutting blade shown in FIG. 1. FIG. 3 is an enlarged plan view of a main part showing a modified example of a grooving blade in the cutting blade shown in FIG. 1. (A) is a plan view of the cutting generation blade included in the cutting blade shown in FIG. 1, and (b) is a side view when viewed from the direction of arrow B in (a), and (c). ) Is a front view when viewed from the arrow C direction in (a), and (d) is a rear view when viewed from the arrow D direction in (a). It is explanatory drawing for demonstrating an example of the manufacturing method of the blade for cutting process shown in FIG. It is explanatory drawing explaining the operation of the blade for cutting process shown in FIG. It is explanatory drawing for demonstrating the process and effect at the time of cutting a corrugated cardboard sheet with a cutting edge. It is a schematic structural cross-sectional view which shows the modification of the blade for cutting process shown in FIG. It is a figure which shows the modification of the cut-out generation blade provided with the cutting-edge cutting edge shown in FIG. It is a side view when viewed from the arrow E direction in a), (c) is a front view when viewed from the arrow F direction in (a), and (d) is an arrow in (a). It is a rear view when viewed from the view G direction. (A) is a plan view showing a modification of the cutting generation blade shown in FIG. 5, and (b) is a plan view showing a modification of the cutting generation blade shown in FIG. It is a top view which shows the deformation example of the blade body provided with the blade for cutting processing shown in FIG. It is a top view which shows the receiving blade used as a lower blade. It is a schematic structural sectional view of the receiving blade (cutting blade) shown in FIG. It is a schematic plan view of the corrugated cardboard sheet after the slit is formed. It is a side view of the conventional cutting edge blade. It is a side view which shows the schematic structure of the grooving apparatus to which the blade for cutting processing is attached. It is a front view which shows the schematic structure of the grooving apparatus to which the blade for cutting processing is attached. It is explanatory drawing which shows the process at the time of cutting a corrugated cardboard sheet with a blade for cutting processing. It is an enlarged view which shows an example of the slit formed in the corrugated cardboard sheet.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Each figure is partially enlarged or reduced to facilitate understanding of the configuration. FIG. 1 is a plan view showing a cutting blade according to an embodiment of the present invention, and FIG. 2 is an enlarged view in a cross section thereof AA. The cutting blade 1 is a blade for forming a slit in a sheet material such as a corrugated cardboard sheet or a synthetic resin sheet while rotating, and as shown in FIGS. 1 and 2, the blade body 2 and the grooving blade 1 are used. 3 and a cutting generation blade 4 are provided.

The blade body 2 is made of a metal material such as stainless steel, iron, or tool steel, and is formed in a fan shape in a plan view as shown in FIG. The blade body 2 is provided with two bolt holes 21 on one end side (one side surface side of the blade body 2). The bolt hole 21 is a hole for attaching the cut generation blade 4 to the blade body 2 by the bolt 50. The two bolt holes 21 are formed side by side along the radial direction of the blade body 2.

The grooving blade 3 is arranged along the outer peripheral portion of the blade body 2 in the same manner as the conventional cutting blade 60 (see FIG. 28). The grooving blade 3 in the present embodiment is a blade portion configured to perform slit processing on the sheet material, and is provided on both side edges in the thickness direction of the blade body 2 as shown in FIG. The specific form of the grooving blade 3 is not particularly limited, and may be formed in a sawtooth shape, for example, as shown in the enlarged plan view of the main part of FIG. When the grooving blade 3 is formed in a sawtooth shape, the distance S between the vertices 3a of the sawtooths 3 adjacent to each other is formed to be, for example, 2.0 mm to 4.0 mm, and the sawtooth 3 is formed. It is preferable to form the maximum height H to be, for example, 2.0 mm to 3.5 mm. Further, when the grooving blade 3 is formed in a sawtooth shape, as shown in FIG. 3, the contour shape 3b of the saw tooth 3 interposed between the vertices 3a of each saw tooth 3 is V-shaped in a plan view. As shown in FIG. 4A, the contour shape 3b may be formed so as to be curved in a plan view. Further, as shown in FIG. 4B, the contour shape 3b may be formed so as to have a V shape inclined to one side in a plan view.

The cut generation blade 4 is a blade portion for forming a slit end portion by cutting off one end of a scrap piece (slit scrap) generated when slitting is performed by a cutting blade 1 from a sheet material such as a corrugated cardboard sheet. be. As shown in FIGS. 1 and 5 (a) to 5 (d), the cut generation blade 4 has a flat plate-shaped mounting portion 41 detachably attached to one end side of the blade body 2 and one end of the mounting portion 41. It is provided with a cutting edge portion 42 formed in the portion. The cutting edge portion 42 is configured as a flat blade. The thickness of the mounting portion 41 is set, for example, in the range of 2 mm to 15 mm. Here, FIG. 5A is a plan view of the cutting generation blade 4 as viewed from above, and FIG. 5B is a side view of FIG. 5A as viewed from the direction of arrow B. be. 5 (c) is a front view seen from the arrow C direction of FIG. 5 (a), and FIG. 5 (d) is a rear view seen from the arrow D direction of FIG. 5 (a). be. As shown in FIG. 1, for example, the cut generation blade 4 is fixed to one end side of the blade body 2 so that the blade edge portion 42 projects radially outward from the outer peripheral surface of the blade body 2. It is preferable that the width of the cutting generation blade 4 is configured to be substantially the same as the thickness of the blade body 2. Further, the mounting portion 41 is configured to be elongated in the radial direction of the blade body 2, and includes a through hole 43 formed corresponding to the bolt hole 21 formed in the blade body 2. ing. In the present embodiment, the contour of the mounting portion is configured to have a rectangular shape in a plan view. The notch generation blade 4 is fixed at a predetermined position of the blade body 2 by tightening the bolt 50 and pressing the mounting portion 41 against the blade body 2 side with the bolt head. The portion around the through hole 43 is the portion that comes into contact with the bolt head of the bolt 50.

In the notch generation blade 4 in FIG. 5, the through hole 43 is formed in a long hole shape along the radial direction of the blade body 2, and the mounting portion 41 (cutting generation blade 4) has the cutting edge portion 42 as a blade. The position of the main body 2 can be adjusted in the radial direction. That is, the dimension of the elongated through hole 43 in the longitudinal direction is longer than the distance between the two bolt holes 21 formed in the blade body 2 (the distance between the bolt holes 21 including the two bolt holes 21). It is configured as follows. The width dimension of the through hole 43 (the width dimension in the vertical direction in FIG. 5A) is set to be larger than the diameter of the shaft portion of the bolt 50 to be inserted.

In the above embodiment, as a cutting generation blade 4 that cuts off one end of a scrap piece generated when slitting is performed by the cutting blade 1 from a sheet material such as a corrugated cardboard sheet, it can be attached to and detached from one end side of the blade body 2. However, the structure is not particularly limited to such a structure, and for example, as shown in FIG. 16 shown in a conventional example, the blade body 2 is integrally configured with the blade body 2. It can also be formed so as to project radially outward from one end of the outer peripheral surface so as to be flush with the end surface of the blade body 2.

In the present invention, as shown in FIGS. 1 and 2, a rough surface portion 5 composed of minute irregularities is formed on the outer side surface of the grooving blade 3 and in the region including the cutting edge 31 of the grooving blade 3. There is. The rough surface portion 3 is formed on the outer side surface of each grooving blade 3 provided on both side edges in the thickness direction of the blade body 2. Further, the rough surface portion 5 is formed so as to form a band along the circumferential direction of the grooving blade 3. The band-shaped rough surface portion 5 may be formed in the entire circumferential direction of the grooving blade 3, or may be formed in a region excluding both ends in the circumferential direction of the grooving blade 3. It may be. Further, the width of the rough surface portion 5 (the length in the radial direction of the blade body 2) has the same dimensions along the circumferential direction of the grooving blade 3 as shown in FIGS. 1 and 2 (of the same width). It is formed so as to form a band). The width of the rough surface portion 5 (the length in the radial direction of the blade body 2) shall be, for example, a dimension of about 5 mm or less from the cutting edge 31 of the grooving blade 3 toward the inside of the blade body 2 in the radial direction. Is preferable.

The rough surface portion 5 is preferably formed by blasting the side surface of the grooving blade 3. For example, the rough surface portion 5 is formed by spraying silica sand or metal particles having an average particle size of 300 μm or more and 1.1 mm or less, more preferably 500 μm or more and 900 μm or less, on the side surface of the blade portion (grooving blade 3). Is preferable. Further, the rough surface portion 5 preferably has a maximum height Sz (surface roughness Sz) of, for example, 10 μm or more and 400 μm or less, and more preferably 70 μm or more and 300 μm or less. Here, the maximum height Sz is a parameter obtained by extending Rz, which is a two-dimensional parameter, to three dimensions, and is measured in accordance with ISO 25178. Similar to Rz, Sz of the rough surface portion 5 is an index indicating the presence or absence of unevenness on the surface of the rough surface portion 5.

Next, an example of a method for manufacturing the cutting blade 1 used as the above-mentioned upper blade will be described with reference to FIG. In addition, in an example of this manufacturing method, the one in which the notch generation blade 4 is integrated with the blade body 2 will be described as an example. First, by cutting the outer peripheral portion of the plate-shaped metal member 8 formed in a fan shape as shown in the plan view of FIG. 6 (a), as shown in the plan view of FIG. 6 (b). , A cutting tool main body 2 in the process of being machined having a hole for inserting a fastening bolt and a notch generating blade 4 is formed. The cut generation blade 4 is formed so as to project radially outward from one end of the outer peripheral surface of the blade body 2. Further, the cut generation blade 4 is formed so as to be flush with the end surface of the blade body 2.

Next, as shown in the cross-sectional view of the main part of FIG. 6C, an inclined surface is formed by cutting at least a part of the outer peripheral portion along the outer peripheral portion of the blade main body 2, and a pair of grooving blades 3 are formed. (Blade) is configured. Specifically, a groove 81 is formed on the outer peripheral portion of the blade body 2 by cutting. The groove 81 is formed along the outer peripheral portion of the blade main body 2 in the entire outer peripheral portion excluding the vicinity of both end portions in the outer peripheral portion. The groove 81 is formed in a V-shape in cross-sectional view, and the side surfaces of the groove 81 facing each other are inclined surfaces in cross-sectional view. The tip of the outer peripheral portion (edge of the inclined surface) of the blade body 2 in which the groove 81 is formed is formed so as to be sharp because it serves as the cutting edge.

Next, the blade body 2 on which the grooving blade 3 is formed is subjected to quenching treatment, and then, as shown in FIG. 6D, the side surface of the grooving blade 3 (blade portion) is the grooving blade. A rough surface portion 5 composed of minute irregularities is formed by blasting in a region including the cutting edge of 3 (blade portion) (rough surface portion forming step). In this blasting process, it is preferable that silica sand or metal particles having an average particle size of 300 μm or more and 1.1 mm or less, more preferably 500 μm or more and 900 μm or less, are sprayed on the side surface of the blade portion (grooving blade 3). Further, in the rough surface portion forming step, it is preferable to perform blasting so as to form a strip-shaped rough surface portion 5 having the same width along the circumferential direction of the grooving blade 3 (blade portion), and the rough surface portion forming step. In the above, it is preferable to perform blasting so that the surface roughness of the rough surface portion 5 has a maximum height Sz of, for example, 10 μm or more and 400 μm or less, more preferably 70 μm or more and 300 μm or less. By completing such a rough surface forming process, the manufacturing process of the cutting edge blade 1 is completed.

Although the quenching process is configured to be performed as a pre-step of the rough surface portion forming step described above, the quenching process may be performed to be performed after the rough surface portion forming step.

The cutting blade 1 having the above configuration is used by being attached to, for example, a grooving device 70 (cutting device) as shown in FIGS. 17 and 18. Since the method of forming a slit in a sheet material such as a corrugated cardboard sheet is the same as the method described in the above background technique, detailed description thereof will be omitted here.

Since the cutting edged and blade 1 according to the present embodiment has a rough surface portion 5 formed of minute irregularities formed on the outer side surface of the grooving blade 3 and a region including the cutting edge 31 of the grooving blade 3. As shown in FIG. 7, when the grooving blade 3 cuts the sheet material 100 and comes out to the lower side of the sheet material 100, the rough surface portion 5 formed in the cutting edge area of the grooving blade 3 is the core 100c. A thin thread-like piece of paper (cutting waste 110a) formed due to the overlapping portion Z can be effectively moved from between the liners 100a and 100b of the corrugated cardboard sheet 100 toward the slit side and separated from the corrugated cardboard sheet 100. The cutting waste 110a separated from the corrugated cardboard sheet 100 will fall downward through the slit. More specifically, as shown in FIGS. 8A to 8F showing the process of cutting the cardboard sheet with the cutting blade, the overlapping portion Z of the core 100c of the cardboard sheet 100 is the upper blade. In the process of cutting the corrugated sheet 100 by being sheared by the side surface (edge) of the cutting blade 1 and the lower blade 75, the cutting edge of the grooving blade 3 in the cutting blade 1 which is the upper blade. The rough surface portion 5 formed in the area and the portion Z that becomes the thread-like cutting waste 110a come into contact with each other. It becomes difficult to separate from the outer surface of the cutting edge of 3, and in a state where the cutting edge portion Z is caught on the cutting edge 31 of the grooving blade 3, it is guided to the lower side of the slit as the grooving blade 3 moves downward, and the cardboard sheet. It separates from between the liners 100a and 100b of 100 and falls downward. That is, according to the cutting tool 1 according to the present invention, at the same time as cutting the corrugated cardboard sheet 100, the thin thread-like cutting waste 110a formed due to the overlapping portion Z of the core 100c is guided to the lower side of the slit. As a result, it is effective that the cutting waste 110a is mixed in after the slitting process, for example, in the process of assembling the corrugated cardboard sheet 100 to form a corrugated cardboard box, or in the process of packing the goods in the corrugated cardboard box. It is possible to prevent it.

Further, since the rough surface portion 5 is formed in substantially the entire area along the circumferential direction of the grooving blade 3, it is caused by the overlapping portion Z of the core 100c in the entire cut end surface formed on the sheet material 100. It is possible to effectively prevent the formed thin thread-like cutting chips 110a from remaining between the liners 100a and 100b of the corrugated cardboard sheet 100.

Further, since the rough surface portion 5 is formed so as to form a strip having the same width along the circumferential direction of the grooving blade 3, the effect of separating the thread-like cutting chips 110a from the corrugated cardboard sheet 100 can be made constant. It will be possible. Further, when the rough surface portion 5 having a predetermined width comes into contact with the cut end surface of the slit 101, it is possible to effectively remove the paper dust adhering to the cut end surface.

Although the cutting blade 1 according to the embodiment of the present invention has been described above, the specific configuration of the cutting blade 1 is not limited to the above embodiment. For example, in the above embodiment, in order to form the cutting edge blade 1 so that a slit can be formed in the sheet material, grooving blades 3 are provided on both side edges of the blade body 2 in the thickness direction. , The form is not particularly limited to such a form. For example, as shown in the schematic structural cross-sectional view of FIG. 9 (corresponding to the AA cross section of FIG. 1), a single blade portion 21 is formed on the outer peripheral portion of the blade body 2 so that the sheet material can be simply cut and separated. Cutting tool 1 for cutting so that a rough surface portion 5 composed of minute irregularities is formed on the side surface of the blade portion 21 including the cutting edge 21a of the blade portion 21. May be configured. When such a configuration is adopted, the rough surface portion 5 may be formed by blasting the region including the blade edge 21a on both side surfaces of the blade portion 21, or the blade edge may be formed on one side surface side. The rough surface portion 5 may be formed by blasting the region including the above. A cutting blade having such a structure is used as an upper blade in a cutting device for cutting a sheet material.

Further, in the above embodiment, the rough surface portions 5 are formed on both of the grooving blades 3 provided on both side edges in the thickness direction of the blade body 2, but for example, one of the grooving blades is formed. The rough surface portion 5 may be provided only on 3.

Further, in the above embodiment, the cutting edge portion 42 of the cutting generation blade 4 is configured as a flat blade, but for example, as shown in FIG. 10, it is configured as a semi-cylindrical form on the back surface side thereof. A semicircular cutting edge may be formed on the outer peripheral edge of one end by notching one end as shown by the broken lines in FIGS. 10A and 10B. The cut generation blade 4 is attached to one end side of the blade body 2 in a direction that exposes the outer peripheral curved surface of the blade edge portion 42 to one end side of the blade body 2. Here, FIG. 10A is a plan view of the cutting generation blade 4 when viewed from above, and FIG. 10B is a view of the cutting generation blade 4 when viewed from the arrow E direction shown in FIG. 10A. It is a side view of. Further, FIG. 10 (c) is a front view when viewed from the direction of arrow F shown in FIG. 10 (a), and FIG. 10 (d) is the direction of arrow G shown in FIG. 11 (a). It is a rear view when viewed from.

Further, in the above embodiment, the cutting generation blade 4 is formed in a flat plate shape, and the cutting edge portion 42 as a flat blade is provided at one end thereof. As shown in FIG. 11A. , One or a plurality of blade edge notches 421 may be formed in the blade edge portion 42. Further, even when the cutting generation blade 4 is configured as a semi-cylindrical form as shown in FIG. 10 and a semicircular cutting edge is formed on the outer peripheral edge of one end thereof, the cutting edge (the cutting edge portion 42 of the cutting edge portion 42) is formed. As shown in FIG. 11B, one or more cutting edge notches 421 may be formed at the tip).

Further, in the above embodiment, the cutting edge portion 42 of the cutting generation blade 4 is configured so that the position can be adjusted in the radial direction of the cutting tool body 2, and the cutting generation blade 4 is fixed to the cutting tool body 2 by two bolts 50. However, the configuration is not particularly limited to such a configuration, and the notch generation blade 4 is fixed to the blade body 2 by a single bolt 50 so that the position can be adjusted in the radial direction of the blade body 2. It may be adopted.

Further, in the above embodiment, the blade body 2 is configured to have a fan-shaped shape. For example, as shown in FIG. 12, one end side of the blade body 2 is cut into a substantially triangular shape in a plan view. The main body notch formed by being cut off may be configured to include a support surface 27 having an inclination of an angle θ with respect to the end face 25 of the blade main body 2. The angle θ is preferably in the range of 5 ° to 30 °, particularly preferably in the range of 10 ° to 20 °, and is set to 15 ° in the present embodiment. The bolt hole 21 used for fixing the notch generation blade 4 is formed on the support surface 27, and the notch generation blade 4 is attached to the support surface 27.

Further, in the above embodiment, the rough surface portion 5 is formed on the cutting blade 1 used as the upper blade, but the structure is not particularly limited to such a structure, and for example, a receiver used as a lower blade. By forming the rough surface portion 5 on the blade (cutting blade used as the lower blade), the same effect, that is, the thread-like cutting waste 110a can be effectively removed from between the liners 100a and 100b of the corrugated cardboard sheet 100. It has the effect of being able to separate.

The receiving blade used as the lower blade is attached to, for example, the facing surfaces of the pair of lower rotating holders 74 and 74 of the grooving device 70, and has a semi-ring shape (as shown in FIG. 13). It is configured to include a first cutting blade 1a and a second cutting blade 1b having a fan shape). The first cutting processing blade 1a and the second cutting processing blade 1b each include a blade body 2 and a blade portion 3.

Each blade body 2 is formed of a metal material such as stainless steel, iron, or tool steel, and is formed in a substantially fan shape (semi-ring shape) in a plan view as shown in FIG. In addition, each blade body 2 is formed with a through hole 21 into which a fastener such as a bolt can be inserted at a predetermined position.

Each blade portion 3 is a blade for cutting a sheet material, is one side of the blade main body 2, and is formed along the outer peripheral portion of the blade main body 2. The specific form of the blade portion 3 is not particularly limited, and for example, it is formed in a sawtooth shape as shown in the enlarged plan view of the main part of FIG. 5 described with respect to the cutting blade 1 used as the upper blade described above. You may. When the blade portion 3 is formed in a sawtooth shape, the distance L between the vertices 3a of each saw tooth 3 adjacent to each other is formed to be, for example, 2.0 mm to 4.0 mm, and the maximum of each saw tooth 3 is formed. It is preferable to form the height H so as to be, for example, 2.0 mm to 3.5 mm. Further, when the blade portion 3 is formed in a sawtooth shape, as shown in FIG. 5, the contour shape 3b of the saw tooth 3 interposed between the vertices 3a of each saw tooth 3 is V-shaped in a plan view. It may be formed, or as shown in FIG. 6A, the contour shape 3b may be formed so as to be curved in a plan view. Further, as shown in FIG. 6B, the contour shape 3b may be formed so as to have a V shape inclined to one side in a plan view. The blade portion 3 is formed on the facing surface side when the receiving blade is attached to the facing surfaces of the pair of lower rotary holders 74 and 74 of the grooving device.

The rough surface portion 5 is formed by forming minute irregularities on the side surface of the blade portion 3 and the region including the cutting edge of the blade portion 3. Further, the rough surface portion 5 is formed so as to form a band along the circumferential direction of the blade portion 3. The band-shaped rough surface portion 5 is formed over the entire circumferential direction of the blade portion 3. Further, as shown in FIGS. 13 and 14, the width of the rough surface portion 5 (the length in the radial direction of the blade body 2) has the same dimensions along the circumferential direction of the blade portion 3 (strip shape of the same width). ). The width of the rough surface portion 5 (the length in the radial direction of the blade body 2) is preferably a dimension of, for example, about 5 mm or less from the cutting edge of the blade portion 3 toward the inside of the blade body 2 in the radial direction. .. The rough surface portion 5 is formed on the surface side facing each other when the receiving blade is attached to the facing surfaces of the pair of lower rotary holders 74 and 74 of the grooving device.

The rough surface portion 5 is preferably formed by blasting the side surface of the blade portion 3. For example, it is preferable that the rough surface portion 5 is formed by spraying silica sand or metal particles having an average particle size of 300 μm or more and 1.1 mm or less, more preferably 500 μm or more and 900 μm or less, on the side surface of the blade portion. Further, the rough surface portion 5 is preferably configured so that the maximum height Sz (surface roughness Sz) is, for example, 10 μm or more and 400 μm or less, and more preferably 70 μm or more and 300 μm or less.

Here, the receiving blade used as the lower blade is configured by combining two first and second cutting blades 1a and 1b formed in a semi-ring shape to form a ring shape as described above. Alternatively, for example, a single ring-shaped cutting blade may be used. Further, it may be formed by combining three or more fan-shaped cutting blades into a ring shape.

As shown in FIG. 8, the receiving blade having such a configuration has a rough surface portion 5 formed of minute irregularities formed on the side surface of the blade portion 3 and a region including the cutting edge of the blade portion 3. When cutting a corrugated cardboard sheet in cooperation with a cutting blade 1 which is an upper blade, the rough surface portion 5 formed in the cutting edge area of the blade portion 3 of the receiving blade is caused by the overlapping portion Z of the core 100c. The thin thread-like piece of paper (cutting waste 110a) formed in the corrugated cardboard sheet 100 can be effectively moved from between the liners 100a and 100b of the corrugated cardboard sheet 100 toward the slit side, and can be separated from the corrugated cardboard sheet 100. The cutting debris separated from the corrugated cardboard sheet 100 will fall downward through the slit. More specifically, as shown in FIG. 8, the overlapping portion Z of the core 100c of the cardboard sheet 100 is sheared by the cutting processing blade 1 which is the upper blade and the receiving blade which is the lower blade, and the cardboard sheet 100 is formed. In the process of cutting, the rough surface portion 5 formed in the cutting edge area of the receiving blade, which is the lower blade, comes into contact with the thread-like cutting debris. The cutting scrap portion sandwiched between the blade and the cutting edge becomes difficult to separate from the outer surface of the cutting edge of the lower blade, and the cutting scrap portion is suppressed from moving toward the back between the liners 100a and 100b of the cardboard sheet 100. As a result, as the grooving blade 3 in the cutting blade 1 which is the upper blade moves downward, the thread-like cutting debris separates from between the liners 100a and 100b of the cardboard sheet 100 and is on the lower side of the slit. It is possible to assist in falling into. That is, according to the receiving blades (cutting blades 1a and 1b) used as the lower blade, thin thread-like cutting chips formed due to the overlapping portion Z of the core 100c at the same time as cutting the corrugated cardboard sheet 100. It is possible to effectively suppress that 110a remains between the liners 100a and 100b of the corrugated cardboard sheet 100, and as a result, a post-process of the slit processing step, for example, the corrugated cardboard sheet 100 is assembled into a corrugated cardboard box. It is possible to effectively prevent the cutting chips 110a from being mixed in in the step of constructing or the step of packing the goods in the cardboard box.

Further, since the rough surface portion 5 is formed in substantially the entire area along the circumferential direction of the blade portion 3, it is formed due to the overlapping portion Z of the core 100c in the entire cut end surface formed on the sheet material. It is possible to effectively prevent the fine thread-like cutting chips from remaining between the liners 100a and 100b of the corrugated cardboard sheet 100.

Further, since the rough surface portion 5 is formed so as to have a strip shape having the same width along the circumferential direction of the blade portion 3, it is possible to make the effect of separating the thread-like cutting chips from the corrugated cardboard sheet constant. ..

1 Cutting blade 2 Cutting blade body 3 Grooving generation blade 31 Cutting edge 4 Cutting generation blade 5 Rough surface 100 Sheet material

Claims (16)

A lower blade used in a cutting device that cuts a corrugated board sheet having a core between a pair of liners by the cooperation of the upper blade and the lower blade.
The lower blade is formed in a ring shape and includes a blade portion arranged along the outer peripheral portion thereof.
A rough surface portion composed of minute irregularities is formed on the side surface of the blade portion and in a region including the blade edge of the blade portion.
The maximum height Sz of the rough surface portion is in the range of 10 μm or more and 400 μm or less.
A lower blade characterized in that the cutting debris can be separated from between the pair of liners by contact between the thread-like cutting debris based on the core formed in the cutting process and the rough surface portion. The lower blade according to claim 1, wherein the rough surface portion is formed so as to form a strip having the same width along the circumferential direction of the blade portion. The lower blade according to claim 1 or 2, wherein the rough surface portion is formed by subjecting a side surface of the blade portion to a blasting process. The lower blade according to any one of claims 1 to 3, wherein the rough surface portion is formed over the entire circumferential direction of the blade portion. The lower blade according to any one of claims 1 to 4, wherein the ring-shaped lower blade is formed by combining two cutting blades formed in a semi-ring shape. The lower blade according to any one of claims 1 to 4, wherein the ring-shaped lower blade is formed by combining a plurality of fan-shaped cutting blades. A lower blade used in a grooving device that forms a slit in a corrugated cardboard sheet having a core between a pair of liners by the cooperation of the upper blade and the lower blade.
The lower blade is formed in a ring shape and includes a blade portion arranged along the outer peripheral portion thereof.
A rough surface portion composed of minute irregularities is formed on the side surface of the blade portion and in a region including the blade edge of the blade portion.
The maximum height Sz of the rough surface portion is in the range of 10 μm or more and 400 μm or less.
A lower blade characterized in that the cutting debris can be separated from between the pair of liners by contact between the thread-like cutting debris based on the core formed in the cutting process and the rough surface portion. The lower blade according to claim 7, wherein the rough surface portion is formed so as to form a strip having the same width along the circumferential direction of the blade portion. The lower blade according to claim 7 or 8, wherein the rough surface portion is formed by subjecting a side surface of the blade portion to a blasting process. The lower blade according to any one of claims 7 to 9, wherein the rough surface portion is formed over the entire circumferential direction of the blade portion. The lower blade according to any one of claims 7 to 10, wherein the ring-shaped lower blade is formed by combining two cutting blades formed in a semi-ring shape. The lower blade according to any one of claims 7 to 10, wherein the ring-shaped lower blade is formed by combining a plurality of fan-shaped cutting blades. Used in a cutting device that cuts a corrugated cardboard sheet having a core between a pair of liners by the cooperation of an upper blade and a lower blade, the pair of thread-like cutting chips formed in the cutting process based on the core. A method for manufacturing a lower blade capable of separating the cutting chips from between the liners of the corrugated cardboard.
The maximum height Sz is in the range of 10 μm or more and 400 μm or less by blasting on the side surface of the blade portion arranged along the outer peripheral portion of the lower blade formed in a ring shape and including the blade edge of the blade portion. A method for manufacturing a lower blade, which comprises a rough surface portion forming step for forming a rough surface portion composed of minute irregularities. The method for manufacturing a lower blade according to claim 13, wherein in the blasting process, silica sand or a metal piece having an average particle size of 300 μm or more and 1.1 mm or less is sprayed on the side surface of the blade portion. The production of the lower blade according to claim 13 or 14, wherein the rough surface portion forming step is blasted so as to form a strip-shaped rough surface portion having the same width along the circumferential direction of the blade portion. Method. The method for manufacturing a lower blade according to any one of claims 13 to 15, wherein the rough surface portion forming step is blasted so as to form the rough surface portion in the entire circumferential direction of the blade portion.

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