JP4475439B1 - Cutting tool - Google Patents

Abstract

The present invention provides a cutting tool capable of suppressing generation of noise and cutting powder when a sheet material is cut.
[Solution]
A cutting tool 1 for cutting a sheet material, comprising a fan-shaped blade body 2 and a saw-tooth cutting blade 3 arranged along the outer periphery of the blade body 2, and having a saw-tooth shape. A plurality of recesses 31 that are continuously provided along the outer peripheral portion of the blade body 2 are formed on the side surface of the cutting blade 3, and the width between the adjacent recesses 31 is 0.2 mm to Cutting tool 1 for cutting, in which a 0.5 mm straight non-dented portion is formed.
[Selection] Figure 1

Description

  The present invention relates to a cutting tool. In particular, the present invention relates to a cutting tool for cutting a sheet material such as a cardboard sheet.

  As a packaging box for storing or moving an article, a cardboard box manufactured by assembling a cardboard sheet 50 as shown in FIG. 11 is known. The upper lid and the bottom plate of the cardboard box are formed by folding slits in a part of the cardboard sheet 50 so that the cut parts overlap each other.

  In forming this slit, a grooving device is generally used, and a cutting tool 60 as shown in FIG. 12 is often used for this grooving device (for example, the prior art of Patent Document 1). reference).

  In this cutting tool 60, a cutting blade 62 and a cutting blade 63 are integrally formed on a blade body 61 formed in a fan shape. The notch generating blade 62 protrudes 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 includes corner portions 64 on both sides in the width direction of the end surface. Yes. The cutting blades 63 are provided on both sides in the thickness direction of the blade body 61 along the outer peripheral surface of the blade body 61.

  The cutting tool 60 is attached to a grooving device 70 as shown in FIGS. FIG. 13 is a side view showing a schematic configuration of the grooving device, and FIG. 14 is a front view. Two cutting tools 60 described above are attached to the grooving device 70, and the configuration of the grooving device 70 will be described below with the cutting tools 60a and 60b as the respective cutting tools.

  The grooving device 70 includes an upper rotating shaft 71 and a lower rotating shaft 72. The upper rotary shaft 71 and the lower rotary 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-like upper rotary holders 73 and 73 and a pair of lower sides are arranged. Rotating holders 74 and 74 are provided.

Two cutting blades 60a and 60b are sandwiched between a pair of upper rotating holders 73 and 73 by fasteners (not shown) such as bolts, respectively. These 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 respective cut generating blades 62a and 62b face each other along the outer peripheral direction. It is attached.
On the other hand, the two receiving blades 75 and 75 are attached to the opposing surfaces of the pair of lower rotating holders 74 and 74 at a predetermined interval corresponding to the thickness dimensions of the cutting blades 60a and 60b. It is done.

  Next, a method for forming a slit in the cardboard sheet 50 using the grooving device 70 having the above configuration will be described. As shown in FIG. 13, with the upper rotating holders 73 and 73 and the lower rotating holders 74 and 74 rotated, the corrugated cardboard sheet 50 is moved along the sheet feeding line L of the grooving device 70 as shown in FIG. Feed to the grooving device 70 from the right side. As a result, the cutting tool 60a is sandwiched between the receiving blades 75 and 75, and the corrugated cardboard sheet 50 is cut to form the front slit 51 having the end portion 53 as an end point as shown in FIG. Similarly, the other cutting tool 60b is sandwiched in the gap between the receiving blades 75, 75, the cardboard sheet 50 is cut, and the rear slit 52 starting from the starting end 54 is formed.

  As a cutting tool used when forming a slit in a corrugated cardboard sheet, in addition to the shape shown in FIG. 12, for example, a cutting blade disclosed in Patent Document 2 is formed in a sawtooth shape. Is also known. FIG. 15 shows an enlarged view of a main part of a cutting tool with a cutting blade formed in a sawtooth shape. The cutting tool 60 is formed as a continuous wave shape (saw tooth shape) on the outer edge of the cutting blade, and a relief recess 65 is formed between the tops of the saw teeth. Between each escape recess 65, a substantially triangular non-recess portion 66 sandwiched between a pair of curved lines that constitute part of the contour of the escape recess 65 adjacent to each other is formed. The non-recessed portion 66 is formed to suppress the generation of the thread-like waste 50a (FIG. 16) remaining in the cut portion when the cardboard sheet 50 is cut.

JP-A-9-39118 JP 08-192390 A

  The cutting tool as disclosed in Patent Document 2 is excellent in that it can effectively suppress the generation of thread-like waste as described above, but each relief recess when cutting corrugated cardboard sheets. There was a problem that the noise was loud because the non-recessed portions arranged between them hit against the cut surface of the corrugated cardboard sheet. In addition, the non-dented portion scrapes the cut surface of the corrugated cardboard sheet, and there is a problem that a large amount of cutting powder is generated.

  The present invention has been made to solve such a problem, and an object of the present invention is to provide a cutting tool capable of suppressing generation of noise and cutting powder when cutting a sheet material.

The object of the present invention is a cutting tool for cutting a sheet material, and includes a fan-shaped blade body part and a sawtooth cutting blade part disposed along the outer periphery of the blade body part. The sawtooth cutting blade portion includes a cutting edge composed of a flat portion along the side surface of the blade main body portion and an inclined surface portion inclined with respect to the flat surface portion. A plurality of recesses provided continuously along the outer peripheral portion of the blade body is formed, and a linear non-recess portion having a width of 0.2 mm to 0.5 mm is formed between the recesses adjacent to each other. This is achieved by the cutting tool being formed.

  In the cutting tool, it is preferable that each non-dented portion is connected to each apex of the sawtooth in the sawtooth cutting blade.

  Moreover, it is preferable that each said linear non-dent part is extended in the direction substantially orthogonal to the tangential direction of the said blade main-body part in each vertex of the saw-tooth cutting blade part.

  Moreover, it is preferable that the said sawtooth-shaped cutting blade part is each provided in the thickness direction both sides of the said cutter main-body part along the outer peripheral surface of the said cutter main-body part.

  Moreover, it is preferable that the plurality of recesses are formed on the side surfaces of the saw-tooth cutting blades facing each other.

  ADVANTAGE OF THE INVENTION According to this invention, the cutting tool which can suppress the noise at the time of cutting | disconnection of a sheet | seat material, and generation | occurence | production of cutting powder can be provided.

It is a perspective view of the cutting tool for cutting which concerns on one Embodiment of this invention. It is a top view of the cutter for cutting shown in FIG. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a principal part enlarged view of FIG. It is explanatory drawing explaining the manufacturing method of the cutter for cutting shown in FIG. It is explanatory drawing explaining one process in the manufacturing method of the cutting tool for cutting shown in FIG. It is sectional drawing which shows the modification of the cutting tool for cutting shown in FIG. It is sectional drawing which shows the other modification of the cutter for cutting shown in FIG. It is explanatory drawing explaining the action | operation of the cutting tool for cutting shown in FIG. It is a schematic plan view of the corrugated cardboard sheet after the slit is formed. It is a top view of the conventional cutting tool. It is a side view which shows schematic structure of the grooving apparatus to which the cutting tool shown in FIG. 12 was attached. It is a front view which shows schematic structure of the grooving apparatus with which the cutting tool for cutting shown in FIG. 12 was attached. It is a principal part enlarged view of the other conventional cutting tool. It is an enlarged view which shows an example of the slit formed in the corrugated cardboard sheet.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a perspective view showing a cutting tool according to an embodiment of the present invention, and FIG. 2 is a plan view thereof. 3 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 4 is a cross-sectional view taken along the line BB in FIG. The cutting tool is a cutting tool for cutting a sheet material such as a corrugated cardboard sheet or a synthetic resin sheet, or for forming a slit in the sheet material. As shown in FIGS. 2, a sawtooth cutting blade portion 3, and a cut generating blade portion 4.

  The blade body 2 is formed in a fan shape in a plan view, and a sawtooth cutting blade 3 is disposed on the outer periphery thereof. At one end of the outer peripheral portion of the blade main body 2, a cut generating blade portion 4 is disposed.

  The sawtooth cutting blade 3 is provided on both sides in the thickness direction of the blade body 2 along the outer peripheral surface of the blade body 2. The saw-tooth cutting blade portion 3 is curved in a circular arc with a loose curve in plan view. One side surface of the sawtooth cutting blade portion 3 is formed to be flat, the thickness is gradually smaller toward the tip, and the blade edge has a rising angle of 45 degrees or less. A plurality of recesses 31 that are continuously provided along the outer periphery of the blade body 2 are formed on the side surfaces of the sawtooth cutting blade 3 that face each other. Between each recessed part 31 adjacent to each other, a linear non-recessed part 32 is formed, and each non-recessed part 32 is connected to each vertex 3a of the sawtooth in the sawtooth cutting blade part 3, respectively. . Moreover, each linear non-dent part 32 is a tangent of the blade main-body part 2 in each vertex 3a of the sawtooth in the sawtooth-shaped cutting blade part 3, as shown in FIG. 5 which is a principal part enlarged view of FIG. S) is formed to extend in a direction substantially orthogonal to the direction. The line width of the linear non-dented portion 32 is preferably formed to be in the range of 0.2 mm to 0.5 mm, for example. Moreover, it is preferable to comprise so that the distance between each adjacent vertex 3a, 3a of the saw-tooth in the saw-tooth-shaped cutting blade part 3 may be in the range of 1 mm to 6 mm, and may be in the range of 2 mm to 4 mm. More preferably, it is configured.

  The incision generating blade portion 4 is a blade portion for cutting off one end of a scrap piece that is produced when the corrugated cardboard sheet is cut by the cutting tool 1 from the one end of the outer peripheral surface of the blade main body portion 2. It protrudes radially outward so as to be flush with the end face of the blade body 2, and is provided with corners 41 on both sides in the width direction of the end face.

  The cutting tool 1 having the above configuration is used by being attached to a grooving device 70 as shown in FIG. 13, for example. Since the method for forming the slits in the corrugated cardboard sheet is the same as the method described in the background art above, detailed description is omitted here.

  In the cutting tool 1 for cutting according to the present embodiment, since the non-dented portion 32 formed between the adjacent concave portions 31 has a linear shape, when cutting a sheet material such as a corrugated cardboard sheet, The area of the non-recessed portion 32 that hits the cut surface of the sheet material can be reduced. As a result, it is possible to suppress the noise generated at the time of contact between the cut surface of the sheet material and the non-dented portion 32 to a low level. In addition, as a result of reducing the area of the non-recessed portion 32 that hits the cut surface of the sheet material, the amount of cutting powder generated by the contact between the cut surface of the sheet material and the non-recessed portion 32 can be reduced.

  Moreover, since the non-dent part 32 in the cutting tool 1 according to the present embodiment is connected to each vertex 3a of the saw tooth in the saw tooth cutting blade part 3, it may occur when cutting the sheet material. The filamentous waste can be reliably divided.

  Next, the manufacturing method of the cutting tool 1 according to this embodiment will be described with reference to FIG. First, by cutting the outer peripheral portion of a plate-like metal member formed in a fan shape as shown in the plan view of FIG. 6A, the blade body 2 shown in the plan view of FIG. 6B. And the cutting tool 8 in the middle of the process provided with the cutting production | generation blade 4 is formed. The cut generating blade 4 is formed so as to protrude radially outward from one end of the outer peripheral surface of the blade body 2. Further, the cut generating 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 body 2 (inclined surface forming step). . If it demonstrates concretely, the groove | channel 81 will be formed in the outer peripheral part of the cutter main-body part 2 by cutting. The groove 81 is formed along the outer peripheral portion of the cutter main body 2 in the entire outer peripheral portion except for the vicinity of both end portions of the outer peripheral portion. The groove 81 is formed in a V-shape when viewed in cross section, and the side surfaces of the groove 81 facing each other are inclined surfaces when viewed in cross section. 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 to be sharp.

  Next, as shown in FIG. 6 (d), the inclined surface is cut to form the sawtooth cutting blade portion 3 (cutting blade forming step). More specifically, by repeating the cutting process of removing a part of the edge of the inclined surface (the outer peripheral end of the blade main body) while forming the recess 31 on the surface of the inclined surface, the outer surface of the blade main body 2 is removed. A saw tooth is formed on the periphery (saw tooth forming step). Various methods can be adopted as the cutting process for forming the saw teeth, but end milling is preferable from the viewpoint of processing accuracy, workability, and the like. Usually, saw teeth are sequentially formed by cutting from one end 82 to the other end 83 of the inclined surface that is the side surface of the groove 81. In addition, saw-tooth is formed so that the linear non-dent part 32 remains between each recessed part 31 formed in the surface of an inclined surface.

  In the step of forming a saw tooth, after cutting the n-th and n + 1-th saw teeth adjacent to each other, the n-th saw tooth is cut again before cutting the n + 2-th saw tooth. Is preferable (return processing step). Referring to the enlarged view of the main part of FIG. 7, after the nth sawtooth is formed, the (n + 1) th sawtooth adjacent to the nth sawtooth is formed. Normally, the next saw tooth is the (n + 2) saw tooth adjacent to the (n + 1) th saw tooth, but before the n + 2 saw tooth is formed, the nth saw tooth is cut again. To do. Thereby, when the (n + 1) th sawtooth is processed, the metal burr generated on the nth sawtooth side of the recess 31a corresponding to this sawtooth can be reliably removed. General removal of metal burrs is performed by barrel polishing after the saw-tooth formation step is completed. However, with this method, the blade at the tip of the saw-tooth is blunted, and the life of the cutting tool (cutting the sheet material) There was a problem that the time that can be shortened. However, by adding the return machining step as described above, it is possible to reliably remove the metal burrs while preventing blunting of the blade at the tip of the saw tooth.

  After machining the n-th saw tooth again, forming the n + 2-th saw tooth, then re-working the n + 1-th saw tooth, and then machining the n + -th saw tooth, When the formation of all the saw teeth is completed, the cutting blade forming step is completed.

  When the cutting tool main body 2 cut in the cutting blade machining step is not quenched in the previous stage of the cutting blade machining step, the cutting blade forming step is completed, and then the cutting blade is formed with all saw teeth. The cutting tool 1 is quenched and the manufacturing process is completed.

  When the cutting tool 1 is manufactured, it is particularly preferable that the blade body 2 cut in the cutting blade processing step is not quenched in the previous stage of the cutting blade processing step. The blade body 2 that has not been subjected to quenching is softer than that after quenching, and can be easily processed into saw teeth. Furthermore, since the cutting tool main body 2 that is the workpiece is in a state that is easy to cut, it is possible to more reliably remove the metal burrs generated by the sawtooth cutting by performing the return machining step. Become.

  The cutting tool 1 according to the embodiment of the present invention has been described above, but the specific configuration of the cutting tool 1 is not limited to the above embodiment. For example, in the above-described embodiment, the sawtooth cutting blade portion 3 is formed so as to have a double-blade configuration provided on each side in the thickness direction of the blade body portion 2 along the outer peripheral surface of the blade body portion 2. As shown in the schematic configuration sectional view of FIG. 8, the cutting blade 1 may be formed so that the sawtooth cutting blade portion 3 has a one-blade configuration.

  Moreover, in the said embodiment, each linear non-dent part 32 is extended in the direction substantially orthogonal to the tangential direction of the blade main-body part 2 in each vertex 3a of the sawtooth in the sawtooth-shaped cutting blade part 3. FIG. For example, as shown in the enlarged view of the main part in FIG. 9, each linear non-dented portion 32 is inclined with respect to the tangential direction of the blade body 2 at each vertex 3 a of the saw tooth. You may form so that it may extend in a direction. In the case of adopting such a configuration, the end point 32a of each non-dented portion 32 disposed on the vertex 3a side of each saw tooth is installed in the grooving device 70 with respect to the other end point 32b of the non-dented portion 32. It is particularly preferable that the straight non-dented portion 32 is formed to be inclined so as to be on the rotational direction side of the cutting tool 1 to be cut. With such a configuration, as shown in FIG. 10, the straight non-dented portion 32 enters the uncut cardboard sheet so as to be substantially perpendicular to the cardboard sheet 50, so that smooth cutting is performed. At the same time, generation of noise and cutting powder can be more effectively suppressed.

DESCRIPTION OF SYMBOLS 1 Cutting tool 2 Blade body part 3 Sawtooth-shaped cutting blade part 31 Recess 32 Non-dent part 3a Saw tooth apex 4 Cutting generation blade

Claims (5)

A cutting tool for cutting a sheet material,
A fan-shaped blade body, and a sawtooth cutting blade disposed along the outer periphery of the blade body,
The sawtooth cutting blade portion includes a cutting edge constituted by a flat surface portion along a side surface of the blade main body portion and an inclined surface portion inclined with respect to the flat surface portion,
The inclined surface portion is formed with a plurality of recesses that are continuously provided along the outer peripheral portion of the blade body portion,
A cutting tool for cutting, in which a linear non-dented portion having a width of 0.2 mm to 0.5 mm is formed between the concave portions adjacent to each other.   2. The cutting tool according to claim 1, wherein each of the non-recessed portions is connected to each vertex of a sawtooth in the sawtooth cutting blade portion.   Each said non-dent part of linear shape is extended in the direction substantially orthogonal to the tangential direction of the said blade main-body part in each vertex of the sawtooth in the said sawtooth-shaped cutting blade part. Cutting tool.   The cutting blade according to any one of claims 1 to 3, wherein the sawtooth cutting blade portion is provided on each of both sides in the thickness direction of the blade body portion along the outer peripheral surface of the blade body portion. 5. The cutting tool according to claim 4, wherein the plurality of concave portions are formed on side surfaces of the saw-toothed cutting blade portions facing each other.