JP2022076182A - Rotary blade for mowing and method of manufacturing the same - Google Patents

Rotary blade for mowing and method of manufacturing the same Download PDF

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JP2022076182A
JP2022076182A JP2020186480A JP2020186480A JP2022076182A JP 2022076182 A JP2022076182 A JP 2022076182A JP 2020186480 A JP2020186480 A JP 2020186480A JP 2020186480 A JP2020186480 A JP 2020186480A JP 2022076182 A JP2022076182 A JP 2022076182A
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plate portion
rotary blade
pedestal
corrugated
corrugated plate
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篤 ▲高▼田
Atsushi Takada
恭介 大橋
Kyosuke Ohashi
大地 ▲高▼田
Daichi Takada
大和 ▲高▼田
Yamato Takada
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Nano TEM Co Ltd
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Nano TEM Co Ltd
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Abstract

To provide a rotary blade for mowing, which can inhibit foreign matter such as pebbles from scattering around, and a method of manufacturing the same.SOLUTION: A rotary blade 10 for mowing includes a base that is formed in a disc shape, and a first corrugated sheet part 21 that is fixed on the outer peripheral side of the base and formed like a corrugated sheet along a rotational direction C of the base and that cuts grass by an end positioned on the radial outside of the base.SELECTED DRAWING: Figure 2

Description

本発明は、草刈用回転刃及びその製造方法に関する。 The present invention relates to a rotary blade for mowing and a method for manufacturing the same.

例えば、特許文献１に記載の刈払刃は、円盤状基板の外周端縁部に同一ピッチで形成された突出状の歯部と、円盤状基板の外周端縁部に沿って配設され、歯部にロウ付けされている超硬チップ刃を備える。超硬チップ刃の刃先は、刈払刃の回転方向を向き、隣り合う２つの歯部の間の凹状のポケットに入り込む草を切断する。 For example, the cutting blade described in Patent Document 1 is arranged along the protruding tooth portions formed at the same pitch on the outer peripheral edge portion of the disk-shaped substrate and along the outer peripheral edge portion of the disk-shaped substrate. It is equipped with a carbide tip blade that is brazed to the teeth. The cutting edge of the carbide tip blade points in the direction of rotation of the cutting blade and cuts grass that enters the concave pocket between two adjacent teeth.

特開２０１５－１９６１０号公報JP-A-2015-19610

上記特許文献１に記載の刈払刃では、ポケットに小石等の異物が引っ掛かって刈払刃の回転力により小石等の異物が周囲に飛散するおそれがある。 In the cutting blade described in Patent Document 1, foreign matter such as pebbles may be caught in the pocket and the foreign matter such as pebbles may be scattered around due to the rotational force of the cutting blade.

本発明は、上記実状を鑑みてなされたものであり、小石等の異物が周囲に飛散することを抑制できる草刈用回転刃及びその製造方法を提供することを目的とする。 The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotary blade for mowing and a method for manufacturing the same, which can suppress foreign substances such as pebbles from scattering to the surroundings.

上記目的を達成するため、本発明の第１の観点に係る草刈用回転刃は、円板状に形成される台座と、前記台座の外周側に固定され、前記台座の回転方向に沿って波板状に形成され、前記台座の径方向外側に位置する端部にて草を切断する第１波板部と、を備える。 In order to achieve the above object, the rotary blade for mowing according to the first aspect of the present invention is fixed to a disk-shaped pedestal and the outer peripheral side of the pedestal, and waves along the rotation direction of the pedestal. It is provided with a first corrugated plate portion that is formed in a plate shape and cuts grass at an end portion located on the radial outer side of the pedestal.

また、前記草刈用回転刃は、前記台座の外周側に固定され、前記回転方向に沿って前記第１波板部と並列に波板状に形成され、前記台座の径方向外側に位置する端部にて草を切断する第２波板部を備える、ようにしてもよい。 Further, the rotary blade for mowing is fixed to the outer peripheral side of the pedestal, is formed in a corrugated shape in parallel with the first corrugated plate portion along the rotational direction, and is an end located on the radial outer side of the pedestal. A second corrugated plate portion for cutting grass at the portion may be provided.

また、前記第１波板部と前記第２波板部は、それぞれ矩形波部を備え、前記草刈用回転刃は、前記第１波板部の前記矩形波部と前記第２波板部の前記矩形波部を互いに対向させることにより形成される筒状部を備える、ようにしてもよい。 Further, the first corrugated plate portion and the second corrugated plate portion each have a rectangular corrugated portion, and the rotary blade for mowing is the rectangular corrugated portion and the second corrugated plate portion of the first corrugated plate portion. It may be provided with a tubular portion formed by facing the rectangular wave portions to each other.

また、前記台座は、前記台座の外周面に形成され、前記筒状部が嵌まる凸部を備える、ようにしてもよい。 Further, the pedestal may be formed on the outer peripheral surface of the pedestal and may include a convex portion into which the tubular portion fits.

また、前記第１波板部は、前記回転方向に沿う平板状で形成される第１平板部と、前記回転方向に沿う平板状で形成され、前記回転方向に交わる方向及び前記回転方向において前記第１平板部と異なる位置に設けられる第２平板部と、前記回転方向に交わる方向に延び、前記第１平板部と前記第２平板部の間を接続する接続部と、を備える、ようにしてもよい。 Further, the first corrugated plate portion is formed in a flat plate shape along the rotation direction and a flat plate shape along the rotation direction, and is described in a direction intersecting the rotation direction and in the rotation direction. It is provided with a second flat plate portion provided at a position different from that of the first flat plate portion, and a connecting portion extending in a direction intersecting the rotational direction and connecting between the first flat plate portion and the second flat plate portion. You may.

上記目的を達成するため、本発明の第２の観点に係る前記草刈用回転刃の製造方法は、前記第１波板部を前記台座にＴｉｇ溶接、スポット溶接又はレーザー溶接により固定する工程を含む。 In order to achieve the above object, the method for manufacturing the rotary blade for mowing according to the second aspect of the present invention includes a step of fixing the first corrugated plate portion to the pedestal by Tig welding, spot welding or laser welding. ..

本発明によれば、草刈用回転刃及びその製造方法において、小石等の異物が周囲に飛散することを抑制できる。 According to the present invention, in the rotary blade for mowing and the method for manufacturing the same, it is possible to suppress the scattering of foreign substances such as pebbles to the surroundings.

本発明の一実施形態に係る草刈用回転刃の斜視図である。It is a perspective view of the rotary blade for mowing which concerns on one Embodiment of this invention. 本発明の一実施形態に係る草刈用回転刃の一部を拡大した斜視図である。It is an enlarged perspective view of a part of the rotary blade for mowing which concerns on one Embodiment of this invention. 本発明の一実施形態に係る台座の一部を拡大した斜視図である。It is an enlarged perspective view of a part of the pedestal which concerns on one Embodiment of this invention. 本発明の一実施形態に係る（ａ）は図２のＡ－Ａ線断面図であり、（ｂ）は（ａ）のＢ－Ｂ線断面図である。FIG. 2A according to an embodiment of the present invention is a sectional view taken along line AA of FIG. 2, and FIG. 2B is a sectional view taken along line BB of FIG. 2A. 本発明の一実施形態に係る図４（ａ）のＤ－Ｄ線断面図である。FIG. 4 is a sectional view taken along line DD of FIG. 4A according to an embodiment of the present invention. 本発明の変形例に係る草刈用回転刃の一部を拡大した斜視図である。It is an enlarged perspective view of a part of the rotary blade for mowing which concerns on the modification of this invention. 本発明の変形例に係る草刈用回転刃の一部を拡大した斜視図である。It is an enlarged perspective view of a part of the rotary blade for mowing which concerns on the modification of this invention.

本発明の一実施形態に係る草刈用回転刃及びその製造方法について図面を参照して説明する。
図１に示すように、草刈用回転刃１０は、回転軸Ｏを中心に回転方向Ｃに沿って回転し、草刈用回転刃１０の外周面にて草等を切断する。回転軸Ｏは、円板状の草刈用回転刃１０の中心に草刈用回転刃１０の厚さ方向に沿って延びる。 A rotary blade for mowing and a method for manufacturing the same according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the mowing rotary blade 10 rotates around the rotation axis O along the rotation direction C, and cuts grass or the like on the outer peripheral surface of the mowing rotary blade 10. The rotary shaft O extends from the center of the disk-shaped rotary blade 10 for mowing along the thickness direction of the rotary blade 10 for mowing.

図１に示すように、草刈用回転刃１０は、台座１１と、台座１１に固定される切断部２０と、を備える。
台座１１は金属製の円板状に形成されている。
図３に示すように、台座１１は、台座１１の外周面に位置し、切断部２０を位置決めする複数の凸部１２を備える。凸部１２は、台座１１の外周面に回転方向Ｃに沿って並べられている。凸部１２は、それぞれ、回転方向Ｃに沿って延びる矩形柱状に形成されている。本例では、複数の凸部１２のうち隣り合う２つの凸部１２ａ，１２ｂには、図２に示すように、１つの切断部２０が装着されている。 As shown in FIG. 1, the mowing rotary blade 10 includes a pedestal 11 and a cutting portion 20 fixed to the pedestal 11.
The pedestal 11 is formed in the shape of a metal disk.
As shown in FIG. 3, the pedestal 11 is located on the outer peripheral surface of the pedestal 11 and includes a plurality of convex portions 12 for positioning the cut portion 20. The convex portions 12 are arranged on the outer peripheral surface of the pedestal 11 along the rotation direction C. Each of the convex portions 12 is formed in a rectangular columnar shape extending along the rotation direction C. In this example, as shown in FIG. 2, one cutting portion 20 is attached to two adjacent convex portions 12a and 12b among the plurality of convex portions 12.

図２及び図４（ａ）に示すように、切断部２０は、凸部１２ａ，１２ｂに嵌まり、草刈用回転刃１０の径方向外側（図４（ｂ）の上側）に位置する端部にて草Ｇを切断する。本例では、切断部２０は、凸部１２ａに嵌まる筒状部２３と、凸部１２ｂに嵌まる筒状部２４と、を備える。筒状部２３と筒状部２４は、回転方向Ｃに並び互いに連結されている。 As shown in FIGS. 2 and 4 (a), the cut portion 20 fits into the convex portions 12a and 12b, and is an end portion located on the radial outer side (upper side of FIG. 4 (b)) of the grass cutting rotary blade 10. Cut grass G at. In this example, the cutting portion 20 includes a tubular portion 23 that fits into the convex portion 12a and a tubular portion 24 that fits into the convex portion 12b. The tubular portion 23 and the tubular portion 24 are arranged in the rotation direction C and connected to each other.

詳しくは、図４（ａ），（ｂ）に示すように、切断部２０は、第１波板部２１と、第２波板部２２と、接着部２５ａ，２５ｂ，２５ｃ，２６と、を備える。
第１波板部２１と第２波板部２２は、回転方向Ｃに沿って延びる矩形波板状をなす。本例では、第１波板部２１と第２波板部２２は、それぞれ２周期分の台形波板状をなす。第１波板部２１と第２波板部２２は、それぞれの台形波部が回転方向Ｃに直交する方向、すなわち回転軸Ｏ（図１参照）に沿う方向に互いに対向するように配置されている。第１波板部２１と第２波板部２２の板厚は、例えば、０．１μｍ～５００μｍに設定される。 Specifically, as shown in FIGS. 4A and 4B, the cutting portion 20 includes a first corrugated plate portion 21, a second corrugated plate portion 22, and adhesive portions 25a, 25b, 25c, 26. Be prepared.
The first corrugated plate portion 21 and the second corrugated plate portion 22 form a rectangular corrugated plate extending along the rotation direction C. In this example, the first corrugated plate portion 21 and the second corrugated plate portion 22 each form a trapezoidal corrugated plate for two cycles. The first corrugated plate portion 21 and the second corrugated plate portion 22 are arranged so that their trapezoidal corrugated portions face each other in the direction orthogonal to the rotation direction C, that is, in the direction along the rotation axis O (see FIG. 1). There is. The plate thickness of the first corrugated plate portion 21 and the second corrugated plate portion 22 is set to, for example, 0.1 μm to 500 μm.

図４（ａ）に示すように、第１波板部２１は、第１平板部２１ａ，２１ｂ，２１ｃと、第２平板部２１ｄ，２１ｅと、接続部２１ｆ，２１ｇ，２１ｈ，２１ｉと、を備える。
図４（ｂ）に示すように、第１平板部２１ａ，２１ｂ，２１ｃは、回転方向Ｃの接線方向Ｅに沿って延びる長方形板状をなす。第１平板部２１ａ，２１ｂ，２１ｃは、接線方向Ｅに沿って並べられる。
第２平板部２１ｄ，２１ｅは、接線方向Ｅに沿って延びる長方形板状をなす。図４（ａ）に示すように、第２平板部２１ｄ，２１ｅは、第１平板部２１ａ，２１ｂ，２１ｃとは回転方向Ｃ及び回転方向Ｃに直交する方向に異なる位置に設けられる。
接続部２１ｆ，２１ｇ，２１ｈ，２１ｉは、第１平板部２１ａ，２１ｂ，２１ｃと第２平板部２１ｄ，２１ｅの間を接続するように設けられ、回転方向Ｃに交わる方向に延びる。接続部２１ｆは、回転方向Ｃにおいて第１平板部２１ａと第２平板部２１ｄの互いに近くに位置する端部同士を接続する。接続部２１ｇは、回転方向Ｃにおいて第２平板部２１ｄと第１平板部２１ｂの互いに近くに位置する端部同士を接続する。接続部２１ｈは、回転方向Ｃにおいて第２平板部２１ｅと第１平板部２１ｂの互いに近くに位置する端部同士を接続する。接続部２１ｉは、回転方向Ｃにおいて第２平板部２１ｅと第１平板部２１ｃの互いに近くに位置する端部同士を接続する。 As shown in FIG. 4A, the first corrugated plate portion 21 includes first flat plate portions 21a, 21b, 21c, second flat plate portions 21d, 21e, and connection portions 21f, 21g, 21h, 21i. Be prepared.
As shown in FIG. 4B, the first flat plate portions 21a, 21b, 21c have a rectangular plate shape extending along the tangential direction E in the rotation direction C. The first flat plate portions 21a, 21b, 21c are arranged along the tangential direction E.
The second flat plate portions 21d and 21e form a rectangular plate extending along the tangential direction E. As shown in FIG. 4A, the second flat plate portions 21d and 21e are provided at positions different from those of the first flat plate portions 21a, 21b and 21c in the direction orthogonal to the rotation direction C and the rotation direction C.
The connecting portions 21f, 21g, 21h, 21i are provided so as to connect between the first flat plate portions 21a, 21b, 21c and the second flat plate portions 21d, 21e, and extend in a direction intersecting the rotation direction C. The connecting portion 21f connects the ends of the first flat plate portion 21a and the second flat plate portion 21d located close to each other in the rotation direction C. The connecting portion 21g connects the ends of the second flat plate portion 21d and the first flat plate portion 21b located close to each other in the rotation direction C. The connecting portion 21h connects the ends of the second flat plate portion 21e and the first flat plate portion 21b located close to each other in the rotation direction C. The connecting portion 21i connects the ends of the second flat plate portion 21e and the first flat plate portion 21c located close to each other in the rotation direction C.

図４（ａ）に示すように、第２波板部２２は、第１波板部２１と同様に、第１平板部２２ａ，２２ｂ，２２ｃと、第２平板部２２ｄ，２２ｅと、接続部２２ｆ，２２ｇ，２２ｈ，２２ｉと、を備える。
第２波板部２２は、回転方向Ｃに直交する方向において第１波板部２１に対して対称となるように設けられる。
第１波板部２１の第１平板部２１ａと第２波板部２２の第１平板部２２ａは互いに対面し接着部２５ａを介して接着されている。第１波板部２１の第１平板部２１ｂと第２波板部２２の第１平板部２２ｂは互いに対面し接着部２５ｂを介して接着されている。第１波板部２１の第１平板部２１ｃと第２波板部２２の第１平板部２２ｃは互いに対面し接着部２５ｃを介して接着されている。接着部２５ａ，２５ｂ，２５ｃは、エポキシ樹脂又は銀ロウ等の接着剤からなる。 As shown in FIG. 4A, the second corrugated plate portion 22 is connected to the first flat plate portions 22a, 22b, 22c and the second flat plate portions 22d, 22e, similarly to the first corrugated plate portion 21. 22f, 22g, 22h, 22i and so on.
The second corrugated plate portion 22 is provided so as to be symmetrical with respect to the first corrugated plate portion 21 in a direction orthogonal to the rotation direction C.
The first flat plate portion 21a of the first corrugated plate portion 21 and the first flat plate portion 22a of the second corrugated plate portion 22 face each other and are bonded via the adhesive portion 25a. The first flat plate portion 21b of the first corrugated plate portion 21 and the first flat plate portion 22b of the second corrugated plate portion 22 face each other and are bonded via the adhesive portion 25b. The first flat plate portion 21c of the first corrugated plate portion 21 and the first flat plate portion 22c of the second corrugated plate portion 22 face each other and are bonded via the adhesive portion 25c. The adhesive portions 25a, 25b, and 25c are made of an adhesive such as epoxy resin or silver wax.

図４（ａ）に示すように、筒状部２３は、接続部２１ｆ，２１ｇ，２２ｆ，２２ｇ及び第２平板部２１ｄ，２２ｄにより構成され、凸部１２ａが嵌まる空洞部ＨＬを有する。筒状部２３は、それぞれの内角が１２０°となる６角形筒状をなす。第２平板部２１ｄ，２２ｄに対応する辺の長さは、接続部２１ｆ，２１ｇ，２２ｆ，２２ｇに対応する辺の長さよりも長く設定されている。筒状部２３は、回転方向Ｃに長い６角形筒状をなす。第２平板部２１ｄ，２２ｄは、凸部１２ａを回転方向Ｃに直交する方向から挟み込む。 As shown in FIG. 4A, the cylindrical portion 23 is composed of connecting portions 21f, 21g, 22f, 22g and second flat plate portions 21d, 22d, and has a hollow portion HL into which the convex portion 12a is fitted. The tubular portion 23 has a hexagonal tubular shape having an internal angle of 120 °. The length of the side corresponding to the second flat plate portion 21d, 22d is set to be longer than the length of the side corresponding to the connecting portions 21f, 21g, 22f, 22g. The tubular portion 23 has a hexagonal tubular shape that is long in the rotation direction C. The second flat plate portions 21d and 22d sandwich the convex portions 12a from the direction orthogonal to the rotation direction C.

図４（ａ）に示すように、筒状部２４は、接続部２１ｈ，２１ｉ，２２ｈ，２２ｉ及び第２平板部２１ｅ，２２ｅにより構成され、凸部１２ｂが嵌まる空洞部ＨＬを有する。筒状部２４は、筒状部２３と同様の形状をなす。
図４（ｂ）に示すように、接着部２６は、台座１１の外周の側面と第１波板部２１と第２波板部２２の下端部の間に設けられ、第１波板部２１と第２波板部２２を台座１１の外周の側面に固定する。接着部２６は、エポキシ樹脂又は銀ロウ等の接着剤からなる。
また、第１波板部２１及び第２波板部２２は、台座１１に、例えば、Ｔｉｇ（Tungsten Inert Gas）溶接、スポット溶接又はレーザー溶接により固定されてもよい。 As shown in FIG. 4A, the cylindrical portion 24 is composed of connecting portions 21h, 21i, 22h, 22i and second flat plate portions 21e, 22e, and has a hollow portion HL into which the convex portion 12b is fitted. The tubular portion 24 has the same shape as the tubular portion 23.
As shown in FIG. 4B, the adhesive portion 26 is provided between the side surface of the outer periphery of the pedestal 11 and the lower end portion of the first corrugated plate portion 21 and the second corrugated plate portion 22, and the first corrugated plate portion 21 is provided. And the second corrugated sheet portion 22 are fixed to the side surface of the outer periphery of the pedestal 11. The adhesive portion 26 is made of an adhesive such as epoxy resin or silver wax.
Further, the first corrugated plate portion 21 and the second corrugated plate portion 22 may be fixed to the pedestal 11 by, for example, Tig (Tungsten Inert Gas) welding, spot welding or laser welding.

図５に示すように、第１波板部２１と第２波板部２２は、それぞれ、草Ｇ等を切断するための複数の砥粒１５と、複数の砥粒１５を結合する結合材１６と、を備える。複数の砥粒１５は、結合材１６内に分布している。複数の砥粒１５は、草刈用回転刃１０の径方向（図５の上下方向）に１列に並べられている。これにより、第１波板部２１と第２波板部２２を薄くすることができ、草刈用回転刃１０の切れ味を向上させることができる。
砥粒１５は、例えば、ダイヤモンドである。なお、砥粒１５は、ダイヤモンドに限らず、立方晶窒化ホウ素（ＣＢＮ）砥粒であってもよいし、ＣＢＮ砥粒とダイヤモンドを混合させてもよい。さらには、複数の砥粒１５は、炭化ケイ素（ＳｉＣ）、又は溶融アルミナ（Ａｌ２Ｏ３）、若しくはこれらを混合したものであってもよい。結合材１６は、内部に複数の砥粒１５を保持する。結合材１６は、ニッケル、鉄、アルミニウム等の金属、アルミニウム合金・青銅（ブロンズ）等の合金、又はセラミック等により形成される。
結合材１６の先端面１６ｓに露出する砥粒１５により草Ｇが切断される。この砥粒１５が摩耗すると結合材１６から脱落して、新たな砥粒１５が結合材１６の先端面１６ｓに露出する。よって、第１波板部２１と第２波板部２２のそれぞれの先端部が摩耗した場合でも、草刈用回転刃１０の切れ味が維持される。 As shown in FIG. 5, the first corrugated plate portion 21 and the second corrugated plate portion 22 each have a plurality of abrasive grains 15 for cutting grass G and the like, and a binder 16 for binding the plurality of abrasive grains 15. And. The plurality of abrasive grains 15 are distributed in the binder 16. The plurality of abrasive grains 15 are arranged in a row in the radial direction (vertical direction in FIG. 5) of the rotary blade 10 for mowing. As a result, the first corrugated plate portion 21 and the second corrugated plate portion 22 can be made thinner, and the sharpness of the rotary blade 10 for mowing can be improved.
The abrasive grain 15 is, for example, diamond. The abrasive grains 15 are not limited to diamond, but may be cubic boron nitride (CBN) abrasive grains, or CBN abrasive grains and diamond may be mixed. Further, the plurality of abrasive grains 15 may be silicon carbide (SiC), molten alumina (Al 2 O 3 ), or a mixture thereof. The binder 16 holds a plurality of abrasive grains 15 inside. The binder 16 is formed of a metal such as nickel, iron or aluminum, an alloy such as an aluminum alloy or bronze, or a ceramic or the like.
The grass G is cut by the abrasive grains 15 exposed on the tip surface 16s of the binder 16. When the abrasive grains 15 are worn, they fall off from the binder 16 and new abrasive grains 15 are exposed on the tip surface 16s of the binder 16. Therefore, even when the tips of the first corrugated plate portion 21 and the second corrugated plate portion 22 are worn, the sharpness of the mowing rotary blade 10 is maintained.

図４（ａ），（ｂ）に示すように、空洞部ＨＬは小石が進入しない程度の大きさに形成される。例えば、空洞部ＨＬにおける第２平板部２１ｄと第２平板部２２ｄの間の距離は、２０μｍ～５ｍｍの範囲に設定される。好ましくは、この距離は、２０μｍ～１ｍｍの範囲に設定される。一例として、この距離は、約２０μｍ、約０．４ｍｍ、約０．８ｍｍ、又は約１．０ｍｍに設定される。
図２に示すように、隣り合う２つの切断部２０の隙間Ｓｋは、小石が進入しない程度の大きさに形成される。例えば、この隙間は、２０μｍ～５ｍｍの範囲に設定される。小石は、粒径２ｍｍ以上の岩石の破片を指し、粒径２５６ｍｍ以上を巨礫、粒径６４ｍｍ～２５６ｍｍを大礫、粒径４ｍｍ～６４ｍｍを中礫、粒径２ｍｍ～４ｍｍを細礫という。 As shown in FIGS. 4A and 4B, the cavity HL is formed in such a size that pebbles do not enter. For example, the distance between the second flat plate portion 21d and the second flat plate portion 22d in the hollow portion HL is set in the range of 20 μm to 5 mm. Preferably, this distance is set in the range of 20 μm to 1 mm. As an example, this distance is set to about 20 μm, about 0.4 mm, about 0.8 mm, or about 1.0 mm.
As shown in FIG. 2, the gap Sk between the two adjacent cutting portions 20 is formed to a size such that pebbles do not enter. For example, this gap is set in the range of 20 μm to 5 mm. Pebbles refer to rock fragments with a particle size of 2 mm or more, and are called large gravel with a particle size of 256 mm or more, large gravel with a particle size of 64 mm to 256 mm, medium gravel with a particle size of 4 mm to 64 mm, and fine gravel with a particle size of 2 mm to 4 mm.

次に、草刈用回転刃１０の使用方法について説明する。
草刈用回転刃１０は、図示しない草刈り機に装着された状態で、回転軸Ｏを中心に回転方向Ｃに回転させられる。草刈用回転刃１０が回転した状態で、草刈用回転刃１０の第１波板部２１と第２波板部２２の端部が草Ｇに接触する。第１平板部２１ａ，２１ｂ，２１ｃ，２２ａ，２２ｂ，２２ｃと第２平板部２１ｄ，２１ｅ，２２ｄ，２２ｅはそれぞれ回転方向Ｃにおいて周期的に交互に草Ｇに接触する。このため、鋸歯と同様に作用することから、切断部２０の草Ｇに対する接触圧が高まり、草Ｇの切断が容易となる。また、第１平板部２１ａ，２１ｂ，２１ｃ，２２ａ，２２ｂ，２２ｃと第２平板部２１ｄ，２１ｅ，２２ｄ，２２ｅが回転方向Ｃにおいて異なる位置に設けられているため、複数箇所で草Ｇに接触して草Ｇを切断することができる。例えば、草刈用回転刃１０が接触する草Ｇの複数箇所のうち草Ｇの切断が容易な箇所が切断される。このため、草Ｇの切断が容易となる。
次に、草刈用回転刃１０の製造方法について説明する。この製造作業は、人又は作業ロボット、若しくは人と作業ロボットの協働により行われる。
まず、第１波板部２１と第２波板部２２を接着部２５ａ，２５ｂ，２５ｃにより接着することによりチップ状の切断部２０が製造される。そして、切断部２０の筒状部２３，２４が台座１１の凸部１２ａ，１２ｂに嵌め込まれる。次に、切断部２０は、Ｔｉｇ溶接、スポット溶接、レーザー溶接又はロウ付けにより台座１１に固定される。台座１１の全ての凸部１２に切断部２０が嵌め込まれて固定されることにより、草刈用回転刃１０の製造が完了する。 Next, a method of using the rotary blade 10 for mowing will be described.
The mowing rotary blade 10 is rotated in the rotation direction C about the rotation axis O in a state of being mounted on a mowing machine (not shown). With the grass cutting rotary blade 10 rotated, the ends of the first corrugated plate portion 21 and the second corrugated plate portion 22 of the grass cutting rotary blade 10 come into contact with the grass G. The first flat plate portions 21a, 21b, 21c, 22a, 22b, 22c and the second flat plate portions 21d, 21e, 22d, 22e each periodically and alternately come into contact with the grass G in the rotation direction C. Therefore, since it acts in the same manner as the saw blade, the contact pressure of the cutting portion 20 with respect to the grass G increases, and the cutting of the grass G becomes easy. Further, since the first flat plate portions 21a, 21b, 21c, 22a, 22b, 22c and the second flat plate portions 21d, 21e, 22d, 22e are provided at different positions in the rotation direction C, they come into contact with the grass G at a plurality of locations. The grass G can be cut. For example, among a plurality of parts of the grass G with which the rotary blade 10 for mowing is in contact, the parts where the grass G can be easily cut are cut. Therefore, the grass G can be easily cut.
Next, a method of manufacturing the rotary blade 10 for mowing will be described. This manufacturing work is performed by a human being, a working robot, or a collaboration between a human and a working robot.
First, the chip-shaped cut portion 20 is manufactured by adhering the first corrugated plate portion 21 and the second corrugated plate portion 22 with the adhesive portions 25a, 25b, 25c. Then, the tubular portions 23 and 24 of the cutting portion 20 are fitted into the convex portions 12a and 12b of the pedestal 11. Next, the cut portion 20 is fixed to the pedestal 11 by Tig welding, spot welding, laser welding or brazing. By fitting and fixing the cutting portions 20 to all the convex portions 12 of the pedestal 11, the production of the rotary blade 10 for mowing is completed.

（効果）
以上、説明した一実施形態によれば、以下の効果を奏する。
（１）草刈用回転刃１０は、円板状に形成される台座１１と、台座１１の外周側に固定され、台座１１の回転方向Ｃに沿って波板状に形成され、台座１１の径方向外側に位置する端部にて草Ｇを切断する第１波板部２１と、を備える。
この構成によれば、草刈用回転刃１０の草Ｇを切断する部位が草刈用回転刃１０の径方向外側を向くため、上記特許文献１に記載の刈払刃と異なりポケットを形成せずに済む。このため、草刈用回転刃１０では、小石等の異物が周囲に飛散することを抑制できる。
また、第１波板部２１は、台座１１の回転方向Ｃに沿って波板状に形成されるため、草刈用回転刃１０の回転中に草Ｇの複数箇所に周期的に接触する。このため、草Ｇの切断が容易となる。 (effect)
According to the above-described embodiment, the following effects are obtained.
(1) The rotary blade 10 for mowing is fixed to the pedestal 11 formed in a disk shape and the outer peripheral side of the pedestal 11, and is formed in a corrugated shape along the rotation direction C of the pedestal 11 and has a diameter of the pedestal 11. A first corrugated plate portion 21 for cutting grass G at an end located on the outer side in the direction is provided.
According to this configuration, since the portion of the rotary blade 10 for mowing that cuts the grass G faces the radial outside of the rotary blade 10 for mowing, unlike the mowing blade described in Patent Document 1, no pocket is formed. I'm done. Therefore, the rotary blade 10 for mowing can prevent foreign substances such as pebbles from scattering around.
Further, since the first corrugated plate portion 21 is formed in a corrugated plate shape along the rotation direction C of the pedestal 11, it periodically contacts a plurality of points of the grass G during the rotation of the grass cutting rotary blade 10. Therefore, the grass G can be easily cut.

（２）草刈用回転刃１０は、台座１１の外周側に固定され、台座１１の回転方向Ｃに沿って第１波板部２１と並列に波板状に形成され、台座１１の径方向外側に位置する端部にて草Ｇを切断する第２波板部２２を備える。
この構成によれば、第１波板部２１と第２波板部２２が並列に設けられるため、草Ｇの接触箇所の数を増やすことができ、草Ｇの切断が容易となる。 (2) The rotary blade 10 for mowing is fixed to the outer peripheral side of the pedestal 11 and is formed in a corrugated shape in parallel with the first corrugated plate portion 21 along the rotation direction C of the pedestal 11, and is radially outside the pedestal 11. A second corrugated plate portion 22 for cutting the grass G at the end portion located at is provided.
According to this configuration, since the first corrugated plate portion 21 and the second corrugated plate portion 22 are provided in parallel, the number of contact points of the grass G can be increased, and the grass G can be easily cut.

（３）第１波板部２１は、第２平板部２１ｄと接続部２１ｆ，２１ｇからなる矩形波部を備える。第２波板部２２は、第２平板部２２ｄと接続部２２ｆ，２２ｇからなる矩形波部を備える。草刈用回転刃１０は、第１波板部２１の矩形波部と第２波板部２２の矩形波部を互いに対向させることにより形成される筒状部２３を備える。
この構成によれば、草刈用回転刃１０は筒状部２３を有するため、草刈用回転刃１０の強度を高めることができる。 (3) The first corrugated plate portion 21 includes a rectangular corrugated portion composed of a second flat plate portion 21d and connecting portions 21f and 21g. The second corrugated plate portion 22 includes a rectangular corrugated portion including a second flat plate portion 22d and connecting portions 22f and 22g. The mowing rotary blade 10 includes a tubular portion 23 formed by facing the rectangular corrugated portion of the first corrugated plate portion 21 and the rectangular corrugated portion of the second corrugated plate portion 22 to each other.
According to this configuration, since the mowing rotary blade 10 has a tubular portion 23, the strength of the mowing rotary blade 10 can be increased.

（４）台座１１は、台座１１の外周面に形成され、筒状部２３が嵌まる凸部１２ａを備える。
この構成によれば、筒状部２３が凸部１２ａに嵌まることにより、第１波板部２１と第２波板部２２が台座１１に位置決めされる。 (4) The pedestal 11 is formed on the outer peripheral surface of the pedestal 11 and includes a convex portion 12a into which the tubular portion 23 is fitted.
According to this configuration, the first corrugated plate portion 21 and the second corrugated plate portion 22 are positioned on the pedestal 11 by fitting the tubular portion 23 into the convex portion 12a.

（５）第１波板部２１は、回転方向Ｃに沿う平板状で形成される第１平板部２１ａ，２１ｂ，２１ｃと、回転方向Ｃに沿う平板状で形成され、回転方向Ｃに交わる方向及び回転方向Ｃにおいて第１平板部２１ａ，２１ｂ，２１ｃと異なる位置に設けられる第２平板部２１ｄ，２１ｅと、回転方向Ｃに交わる方向に延び、第１平板部２１ａ，２１ｂ，２１ｃと第２平板部２１ｄ，２１ｅの間を接続する接続部２１ｆ，２１ｇ，２１ｈ，２１ｉと、を備える。
この構成によれば、第１平板部２１ａ，２１ｂ，２１ｃと第２平板部２１ｄ，２１ｅは、それぞれ異なる位置で草Ｇを切断することができる。 (5) The first corrugated plate portion 21 is formed in a flat plate shape along the rotation direction C and is formed in a flat plate shape along the rotation direction C, and intersects the rotation direction C. And the second flat plate portions 21d, 21e provided at positions different from the first flat plate portions 21a, 21b, 21c in the rotation direction C, and the first flat plate portions 21a, 21b, 21c and the second plate portions 21a, 21b, 21c extending in the direction intersecting the rotation direction C. It is provided with connecting portions 21f, 21g, 21h, 21i connecting between the flat plate portions 21d and 21e.
According to this configuration, the first flat plate portions 21a, 21b, 21c and the second flat plate portions 21d, 21e can cut the grass G at different positions.

（６）草刈用回転刃１０の製造方法は、第１波板部２１を台座１１にＴｉｇ溶接、スポット溶接又はレーザー溶接により固定する工程を含む。
この構成によれば、第１波板部２１を台座１１に低エネルギーで接合することが可能となる。
また、第１波板部２１及び第２波板部２２からなるチップ状の切断部２０を台座１１にＴｉｇ溶接、スポット溶接又はレーザー溶接により固定してもよい。 (6) The method for manufacturing the rotary blade 10 for mowing includes a step of fixing the first corrugated plate portion 21 to the pedestal 11 by Tig welding, spot welding or laser welding.
According to this configuration, the first corrugated sheet portion 21 can be joined to the pedestal 11 with low energy.
Further, the chip-shaped cutting portion 20 composed of the first corrugated plate portion 21 and the second corrugated plate portion 22 may be fixed to the pedestal 11 by Tig welding, spot welding or laser welding.

なお、本発明は以上の実施形態及び図面によって限定されるものではない。本発明の要旨を変更しない範囲で、適宜、変更（構成要素の削除も含む）を加えることが可能である。以下に、変形の一例を説明する。 The present invention is not limited to the above embodiments and drawings. Changes (including deletion of components) can be made as appropriate without changing the gist of the present invention. An example of the modification will be described below.

（変形例）
上記実施形態においては、１つの切断部２０は、２つの筒状部２３，２４を有していたが、これに限らず、１つ又は３つ以上の筒状部を有していてもよい。 (Modification example)
In the above embodiment, one cutting portion 20 has two tubular portions 23, 24, but the present invention is not limited to this, and one or more tubular portions may be provided. ..

上記実施形態においては、第１波板部２１と第２波板部２２は、それぞれ、複数の砥粒１５を備えていたが、複数の砥粒１５が省略されてもよい。この場合、第１波板部２１と第２波板部２２は先端が鋭利となる超硬合金等の金属により形成されてもよい。 In the above embodiment, the first corrugated sheet portion 21 and the second corrugated sheet portion 22 each include a plurality of abrasive grains 15, but the plurality of abrasive grains 15 may be omitted. In this case, the first corrugated plate portion 21 and the second corrugated plate portion 22 may be formed of a metal such as a cemented carbide having a sharp tip.

上記実施形態においては、第１波板部２１と第２波板部２２は、２周期分の矩形波板状をなしていたが、これに限らず、それぞれ１周期分の矩形波板状をなしていてもよいし、３周期以上分の矩形波板状をなしていてもよい。
また、上記実施形態においては、第１波板部２１の矩形波部と第２波板部２２の矩形波部は互いに対向するように設けられていたが、これに限らず、第１波板部２１の矩形波部と第２波板部２２の矩形波部が互いに対向しないように設けられていてもよい。言い換えると、第１波板部２１と第２波板部２２の位相がずれるように設けられてもよい。これにより、空洞部ＨＬのサイズが小さくなる。 In the above embodiment, the first corrugated plate portion 21 and the second corrugated plate portion 22 have a rectangular corrugated plate shape for two cycles, but the present invention is not limited to this, and each has a rectangular corrugated plate shape for one cycle. It may be a rectangular corrugated sheet for three or more cycles.
Further, in the above embodiment, the rectangular wave portion of the first corrugated plate portion 21 and the rectangular wave portion of the second corrugated plate portion 22 are provided so as to face each other, but the present invention is not limited to this, and the first corrugated plate portion is not limited to this. The rectangular wave portion of the portion 21 and the rectangular wave portion of the second corrugated plate portion 22 may be provided so as not to face each other. In other words, the first corrugated plate portion 21 and the second corrugated plate portion 22 may be provided so as to be out of phase with each other. This reduces the size of the cavity HL.

上記実施形態においては、草刈用回転刃１０は、回転軸Ｏに沿って並ぶ第１波板部２１と第２波板部２２を備えていたが、第１波板部２１と第２波板部２２の何れか一方が省略されてもよい。例えば、図７に示すように、第２波板部２２が省略されて、第１波板部２１のみから切断部２０が構成されてもよい。
また、草刈用回転刃１０は回転軸Ｏに沿って並ぶ３つ以上の波板部を備えていてもよい。 In the above embodiment, the rotary blade 10 for mowing includes a first corrugated plate portion 21 and a second corrugated plate portion 22 arranged along the rotation axis O, but the first corrugated plate portion 21 and the second corrugated plate portion 21. Either one of the parts 22 may be omitted. For example, as shown in FIG. 7, the second corrugated plate portion 22 may be omitted, and the cutting portion 20 may be configured from only the first corrugated plate portion 21.
Further, the rotary blade 10 for mowing may be provided with three or more corrugated plate portions arranged along the rotation axis O.

上記実施形態においては、複数の切断部２０は、草刈用回転刃１０の外周全域に沿って隙間Ｓｋを持って並べられていた。しかしながら、これに限らず、図６に示すように、１つの第１波板部２１と１つの第２波板部２２は、それぞれ、草刈用回転刃１０の外周の全域に沿ってリング状に形成されてもよい。 In the above embodiment, the plurality of cutting portions 20 are arranged with a gap Sk along the entire outer circumference of the rotary blade 10 for mowing. However, not limited to this, as shown in FIG. 6, one corrugated plate portion 21 and one second corrugated plate portion 22 each form a ring along the entire outer periphery of the rotary blade 10 for mowing. It may be formed.

上記実施形態においては、筒状部２３，２４は、それぞれ、６角形筒状をなしていたが、これに限らず、五角以下又は七角以上の多角形筒状であってもよいし、楕円を含む円筒状をなしていてもよい。
上記実施形態における台座１１の凸部１２ａ，１２ｂは省略されてもよい。 In the above embodiment, the tubular portions 23 and 24 have a hexagonal cylindrical shape, respectively, but the present invention is not limited to this, and may be a polygonal tubular shape having a pentagon or less or a seven-sided or more, or an ellipse. It may have a cylindrical shape including.
The convex portions 12a and 12b of the pedestal 11 in the above embodiment may be omitted.

上記実施形態においては、第１波板部２１と第２波板部２２は、接着部２５ａ，２５ｂ，２５ｃを介して接着されていたが、これに限らず、互いに離れた位置に設けられていてもよい。 In the above embodiment, the first corrugated plate portion 21 and the second corrugated plate portion 22 are adhered to each other via the adhesive portions 25a, 25b, 25c, but the present invention is not limited to this, and the first corrugated plate portion 21 and the second corrugated plate portion 22 are provided at positions separated from each other. You may.

上記実施形態における接着部２５ａ，２５ｂ，２５ｃ内には、草Ｇを切断するＣＢＮ砥粒又はダイヤモンド等の砥粒が分布していてもよい。これにより、草刈用回転刃１０の切れ味を向上させることができる。この砥粒の平均粒径は、砥粒１５の平均粒径と同等であってもよいし、砥粒１５の平均粒径よりも小さく設定されてもよい。 CBN abrasive grains for cutting grass G or abrasive grains such as diamond may be distributed in the bonded portions 25a, 25b, 25c in the above embodiment. Thereby, the sharpness of the rotary blade 10 for mowing can be improved. The average particle size of the abrasive grains may be the same as the average particle size of the abrasive grains 15, or may be set smaller than the average particle size of the abrasive grains 15.

上記実施形態においては、複数の砥粒１５は、結合材１６内で草刈用回転刃１０の径方向に１列に並べられていたが、これに限らず、２列以上で並べられていてもよいし、結合材１６内でランダムに分布していてもよい。
また、台座１１と第１波板部２１及び第２波板部２２は一体形成されてもよい。 In the above embodiment, the plurality of abrasive grains 15 are arranged in one row in the radial direction of the mowing rotary blade 10 in the binder 16, but the present invention is not limited to this, and the plurality of abrasive grains 15 may be arranged in two or more rows. Alternatively, it may be randomly distributed in the binder 16.
Further, the pedestal 11, the first corrugated plate portion 21, and the second corrugated plate portion 22 may be integrally formed.

１０…草刈用回転刃、１１…台座、１２，１２ａ，１２ｂ…凸部、１５…砥粒、１６…結合材、１６ｓ…先端面、２０…切断部、２１…第１波板部、２１ａ，２１ｂ，２１ｃ，２２ａ，２２ｂ，２２ｃ…第１平板部、２１ｄ，２１ｅ，２２ｄ，２２ｅ…第２平板部、２１ｆ，２１ｇ，２１ｈ，２１ｉ，２２ｆ，２２ｇ，２２ｈ，２２ｉ…接続部、２２…第２波板部、２３，２４…筒状部、２５ａ，２５ｂ，２５ｃ，２６…接着部、Ｃ…回転方向、Ｅ…接線方向、Ｇ…草、Ｏ…回転軸、ＨＬ…空洞部、Ｓｋ…隙間 10 ... rotary blade for mowing, 11 ... pedestal, 12, 12a, 12b ... convex part, 15 ... abrasive grains, 16 ... binder, 16s ... tip surface, 20 ... cutting part, 21 ... first corrugated plate part, 21a, 21b, 21c, 22a, 22b, 22c ... 1st flat plate portion, 21d, 21e, 22d, 22e ... 2nd flat plate portion, 21f, 21g, 21h, 21i, 22f, 22g, 22h, 22i ... Connection portion, 22 ... 2 Corrugated plate part, 23, 24 ... Cylindrical part, 25a, 25b, 25c, 26 ... Adhesive part, C ... Rotation direction, E ... Tangent direction, G ... Grass, O ... Rotation axis, HL ... Cavity part, Sk ... gap

Claims (6)

円板状に形成される台座と、
前記台座の外周側に固定され、前記台座の回転方向に沿って波板状に形成され、前記台座の径方向外側に位置する端部にて草を切断する第１波板部と、を備える、
草刈用回転刃。 The pedestal formed in the shape of a disk and
It is provided with a first corrugated plate portion that is fixed to the outer peripheral side of the pedestal, is formed in a corrugated plate shape along the rotation direction of the pedestal, and cuts grass at an end located on the radial outer side of the pedestal. ,
Rotary blade for mowing. 前記台座の外周側に固定され、前記回転方向に沿って前記第１波板部と並列に波板状に形成され、前記台座の径方向外側に位置する端部にて草を切断する第２波板部を備える、
請求項１に記載の草刈用回転刃。 A second portion fixed to the outer peripheral side of the pedestal, formed in a corrugated shape in parallel with the first corrugated plate portion along the rotation direction, and cutting grass at an end located on the radial outer side of the pedestal. Equipped with a corrugated sheet
The rotary blade for mowing according to claim 1. 前記第１波板部と前記第２波板部は、それぞれ矩形波部を備え、
前記草刈用回転刃は、前記第１波板部の前記矩形波部と前記第２波板部の前記矩形波部を互いに対向させることにより形成される筒状部を備える、
請求項２に記載の草刈用回転刃。 The first corrugated plate portion and the second corrugated plate portion each have a rectangular corrugated portion.
The rotary blade for mowing includes a tubular portion formed by facing the rectangular wave portion of the first corrugated plate portion and the rectangular wave portion of the second corrugated plate portion to each other.
The rotary blade for mowing according to claim 2. 前記台座は、前記台座の外周面に形成され、前記筒状部が嵌まる凸部を備える、
請求項３に記載の草刈用回転刃。 The pedestal is formed on the outer peripheral surface of the pedestal and includes a convex portion into which the tubular portion fits.
The rotary blade for mowing according to claim 3. 前記第１波板部は、
前記回転方向に沿う平板状で形成される第１平板部と、
前記回転方向に沿う平板状で形成され、前記回転方向に交わる方向及び前記回転方向において前記第１平板部と異なる位置に設けられる第２平板部と、
前記回転方向に交わる方向に延び、前記第１平板部と前記第２平板部の間を接続する接続部と、を備える、
請求項１から４の何れか１項に記載の草刈用回転刃。 The first corrugated sheet portion is
The first flat plate portion formed in the shape of a flat plate along the rotation direction,
A second flat plate portion formed in a flat plate shape along the rotation direction and provided at a position different from that of the first flat plate portion in the direction intersecting the rotation direction and in the rotation direction.
A connection portion extending in a direction intersecting the rotation direction and connecting between the first flat plate portion and the second flat plate portion is provided.
The rotary blade for mowing according to any one of claims 1 to 4. 請求項１から５の何れか１項に記載の草刈用回転刃の製造方法であって、
前記第１波板部を前記台座にＴｉｇ溶接、スポット溶接又はレーザー溶接により固定する工程を含む、
製造方法。 The method for manufacturing a rotary blade for mowing according to any one of claims 1 to 5.
The step of fixing the first corrugated plate portion to the pedestal by Tig welding, spot welding or laser welding is included.
Production method.
JP2020186480A 2020-11-09 2020-11-09 Rotary blade for mowing and method of manufacturing the same Pending JP2022076182A (en)

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