JP4957902B2 - Rotating blade for mowing and manufacturing method thereof - Google Patents

Rotating blade for mowing and manufacturing method thereof Download PDF

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JP4957902B2
JP4957902B2 JP2007132137A JP2007132137A JP4957902B2 JP 4957902 B2 JP4957902 B2 JP 4957902B2 JP 2007132137 A JP2007132137 A JP 2007132137A JP 2007132137 A JP2007132137 A JP 2007132137A JP 4957902 B2 JP4957902 B2 JP 4957902B2
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blade
base metal
rotary blade
outer peripheral
peripheral edge
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JP2008263934A (en
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力 宮崎
務 市川
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株式会社トリガー
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Description

本発明は、台金の外周縁部に設けた刃で雑草や雑木等を刈払いするための刈払い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 brush cutting for cutting weeds, trees and the like with a blade provided on an outer peripheral edge of a base metal, and a method for manufacturing the rotary blade.

従来、刈払い用回転刃は、円板状の台金の外周縁部に所定間隔で多数のチップ取付凹部を形成し、このチップ取付凹部に超硬金属やダイヤモンドからなるチップがそれぞれロウ付け固着されることにより形成されている。なお、この種の回転刃としては、例えば特許文献１に開示されている。
実用新案登録第２５３００６３号公報 Conventionally, a rotary blade for brush cutting has a large number of chip mounting recesses formed at predetermined intervals on the outer peripheral edge of a disk-shaped base metal, and chips made of cemented carbide or diamond are brazed and fixed to the chip mounting recesses, respectively. Is formed. In addition, as this kind of rotary blade, it is disclosed by patent document 1, for example.
Utility Model Registration No.2530063

しかしながら、このようなチップを有する回転刃においては、台金の多数のチップ取付凹部に銀ローとフラックスを使用してチップを固着する必要があるため、ロー付け作業自体に熟練を有し、回転刃自体のコストの低減化に自ずと限界があると共に、フラックス等の使用によりチップ固着作業現場の作業環境が悪化し易く、かつ銀ローの使用で限りある銀資源の有効利用の面からも好ましくないという問題点を有している。  However, in a rotary blade having such a tip, it is necessary to fix the tip to a large number of chip mounting recesses of the base metal using silver solder and flux. There is a limit to reducing the cost of the blade itself, and the working environment of the chip fixing work site is likely to deteriorate due to the use of flux, etc., and it is not preferable from the viewpoint of effective use of silver resources, which is limited by the use of silver raw material. Has the problem.

本発明は、このような事情に鑑みてなされたもので、その目的は、チップを使用することなくチップと同等の切れ味が得られてコストの低減化が図れると共に、回転刃製造現場の作業環境の改善等が容易に図れる刈払い用回転刃及びその製造方法を提供することにある。  The present invention has been made in view of such circumstances, and an object thereof is to obtain a sharpness equivalent to that of a chip without using the chip, thereby reducing the cost and working environment of the rotary blade manufacturing site. It is an object of the present invention to provide a rotary blade for brush cutting and a method for manufacturing the same.

かかる目的を達成すべく、本発明のうち請求項１に記載の発明は、円板状の台金の中心位置に刈払い機への取付穴が形成されると共に外周縁部に多数の刃が形成された刈払い用回転刃であって、前記刃は、台金の外周縁部を圧縮成形することにより、台金の板厚より大きな厚みを有して台金に一体成形されていることを特徴とし、請求項２に記載の発明は、前記台金の硬さがＨＲＣ３５以上で前記刃の硬さがＨＲＣ６０以上に設定されていることを特徴とする。  In order to achieve such an object, the invention described in claim 1 of the present invention is such that a mounting hole for a brush cutter is formed at the center position of a disk-shaped base metal, and a plurality of blades are provided at the outer peripheral edge. A rotary blade for brush cutting formed, wherein the blade has a thickness larger than the thickness of the base metal and is integrally formed with the base metal by compressing the outer peripheral edge of the base metal. The invention according to claim 2 is characterized in that the hardness of the base metal is set to HRC35 or more and the hardness of the blade is set to HRC60 or more.

また、請求項３に記載の発明は、中心位置に刈払い機への取付穴が形成されると共に外周縁部に多数の刃形成部が形成された円板状の台金をセットする工程と、該セットされた台金の刃形成部を加熱する工程と、該加熱された刃形成部を圧縮成形することにより台金の板厚より大きな厚みを有する刃を一体成形する工程と、を備えることを特徴とし、請求項４に記載の発明は、前記加熱する工程が直接通電加熱もしくは間接通電加熱で行われることを特徴とする。  The invention according to claim 3 is a step of setting a disk-shaped base metal in which a mounting hole to the brush cutter is formed at the center position and a plurality of blade forming portions are formed on the outer peripheral edge portion. A step of heating the blade forming portion of the set base metal, and a step of integrally forming a blade having a thickness larger than the plate thickness of the base metal by compression molding the heated blade forming portion. The invention according to claim 4 is characterized in that the heating step is performed by direct current heating or indirect current heating.

本発明の請求項１に記載の発明によれば、円板状の台金の外周縁部に形成される多数の刃が、台金の外周縁部を圧縮成形することにより、台金の板厚より大きな厚みを有して台金に一体成形されているため、刃としてのチップが不要となり、一体成形の刃によりチップと同等の切れ味が得られて回転刃自体のコストの低減化が図れると共に、フラックス等の使用が不要となって回転刃製造現場の作業環境の改善を図ることができ、かつ限りある銀資源等の有効利用や刃の飛散防止による刈払い作業の安全性の向上等を図ることができる。  According to the first aspect of the present invention, a plurality of blades formed on the outer peripheral edge portion of the disk-shaped base metal compress the outer peripheral edge portion of the base metal, thereby forming the base metal plate. Since it has a thickness larger than the thickness and is integrally formed on the base metal, a tip as a blade is not necessary, and the sharpness equivalent to the tip can be obtained by the integrally formed blade, and the cost of the rotary blade itself can be reduced. In addition, the use of flux, etc. is no longer required, and the working environment of the rotary blade manufacturing site can be improved. The effective use of limited silver resources and the improvement of the safety of the brush cutting work by preventing the scattering of the blade, etc. Can be achieved.

また、請求項２に記載の発明によれば、請求項１に記載の発明の効果に加え、台金の硬さがＨＲＣ３５以上で刃の硬さがＨＲＣ６０以上に設定されているため、一体成形の刃にチップと同等の硬さを持たせることができて、回転刃の切れ味をチップを有する回転刃と同等に設定することができる。  Further, according to the invention described in claim 2, in addition to the effect of the invention described in claim 1, since the hardness of the base metal is set to HRC35 or more and the hardness of the blade is set to HRC60 or more, integral molding The blade can have the same hardness as the tip, and the sharpness of the rotary blade can be set equal to that of the rotary blade having the tip.

また、請求項３に記載の発明によれば、外周縁部に多数の刃形成部が形成された台金をセットする工程、台金の刃形成部を加熱する工程及び刃形成部を圧縮成形して台金の板厚より大きな厚みを有する刃を一体成形する工程を備えるため、刃としてのチップが不要となり、一体成形の刃によりチップと同等の切れ味が得られて回転刃自体のコストの低減化が図れると共に、フラックス等の使用が不要となって回転刃製造現場の作業環境の改善を図ることができ、かつ限りある銀資源等の有効利用や刃の飛散防止による刈払い作業の安全性の向上等を図ることができる。  According to the invention of claim 3, the step of setting a base having a large number of blade forming portions formed on the outer peripheral edge, the step of heating the blade forming portion of the base and the blade forming portion are compression molded. In addition, since a step of integrally forming a blade having a thickness larger than the thickness of the base metal is provided, there is no need for a tip as a blade. It is possible to reduce the use of flux, etc., and to improve the working environment at the rotary blade manufacturing site. Also, the effective use of limited silver resources and the safety of brush cutting work by preventing blade scattering. The improvement of property etc. can be aimed at.

また、請求項４に記載の発明によれば、請求項３に記載の発明の効果に加え、加熱する工程が直接通電加熱もしくは間接通電加熱で行われるため、刃形成部の加熱を設備状況に応じて効率的に行うことができ、製造コストの一層の低減化を図ることができる。  According to the invention described in claim 4, in addition to the effect of the invention described in claim 3, since the heating step is performed by direct current heating or indirect current heating, the heating of the blade forming portion is brought into the equipment situation. Accordingly, the production can be efficiently performed, and the manufacturing cost can be further reduced.

以下、本発明を実施するための最良の形態を図面に基づいて詳細に説明する。
図１〜図５は、本発明に係わる刈払い用回転刃の一実施形態を示し、図１がその平面図、図２が製造方法の一例を示す工程説明図、図３及び図４がその説明図、図５が刃の斜視図である。The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
1 to 5 show an embodiment of a rotary blade for brush cutting according to the present invention, FIG. 1 is a plan view thereof, FIG. 2 is a process explanatory view showing an example of a manufacturing method, and FIGS. An explanatory view and FIG. 5 are perspective views of the blade.

図１において、刈払い用回転刃１（以下回転刃１という）は、所定板厚の円板状の台金２を有し、この台金２の中心位置には、図示しない刈払い機への取付用の所定内径の取付穴３が形成されている。また、台金２の外周縁部２ａには、所定間隔で多数の刃４が台金２に一体成形により形成されている。  In FIG. 1, a rotary blade 1 for brush cutting (hereinafter referred to as a rotary blade 1) has a disk-shaped base metal 2 having a predetermined thickness, and a central part of the base metal 2 is connected to a brush cutter (not shown). A mounting hole 3 having a predetermined inner diameter is formed. Further, a large number of blades 4 are formed on the base metal 2 by integral molding at an outer peripheral edge 2 a of the base metal 2 at a predetermined interval.

そして、この刃４は、図２に示すようにして製造される。すなわち、先ず、図３に示すような成形用凹部５ａと電源が接続される支持部５ｂを有する成形金型５と、台金２の外周縁部２ａに嵌合可能な嵌合溝６ａを有する押さえ６を準備すると共に、プレス成形により外周縁部２ａに刃形成部２ｂが形成され、焼き入れ、焼き戻し及び表面研磨によりその硬度がＨＲＣ３５＋−以上に設定された台金２を準備し、図２（ａ）に示すように、台金２の外周縁部２ａ上に成形金型５を配置する。なお、図４に示すように、台金２の刃形成部２ｂの先端面（外周面）の外形寸法や成形金型５の成形用凹部５ａの幅寸法Ｗやその下降距離Ｌは、後述する如く刃形成部２ｂが圧縮成形された際に所定の刃４を形成し得るように設定されている。  And this blade 4 is manufactured as shown in FIG. That is, first, a molding die 5 having a molding recess 5a and a support portion 5b to which a power source is connected as shown in FIG. 3 and a fitting groove 6a that can be fitted to the outer peripheral edge 2a of the base metal 2 are provided. In addition to preparing the presser 6, a blade forming portion 2b is formed on the outer peripheral edge portion 2a by press molding, and a base metal 2 whose hardness is set to HRC35 + − or higher is prepared by quenching, tempering and surface polishing. As shown to 2 (a), the shaping die 5 is arrange | positioned on the outer-periphery edge part 2a of the base metal 2. As shown to FIG. In addition, as shown in FIG. 4, the external dimension of the front end surface (outer peripheral surface) of the blade forming portion 2b of the base metal 2, the width dimension W of the molding recess 5a of the molding die 5, and the descending distance L thereof will be described later. Thus, when the blade forming portion 2b is compression-molded, the predetermined blade 4 can be formed.

この状態で、図２（ｂ）に示すように、押さえ６の嵌合溝６ａを台金２に嵌合させて台金２を所定位置に保持し、その後、成形金型５を矢印イの如く下降させてその成形用凹部５ａ内に台金２の刃形成部２ｂを位置させ、台金２をセット状態とする。また、このとき、成形金型５のシャフト５ｂと台金２の刃形成部２ｂ間に交流または直流の電源７を接続する。  In this state, as shown in FIG. 2 (b), the fitting groove 6a of the presser 6 is fitted to the base metal 2 to hold the base metal 2 in a predetermined position. Thus, the blade forming portion 2b of the base metal 2 is positioned in the molding recess 5a, and the base metal 2 is set. At this time, an AC or DC power source 7 is connected between the shaft 5 b of the molding die 5 and the blade forming portion 2 b of the base metal 2.

次に、台金２をセット状態としたら、電源７を作動させて成形金型５と台金２間に所定時間電流を流して台金２の刃形成部２ｂを通電加熱し、刃形成部２ｂが所定温度まで加熱された時点で成形金型５を図２（ｃ）の矢印イの如く所定距離Ｌ下降させる。この成形金型５の下降により、台金２の加熱された刃形成部２ｂが圧縮成形されて、図５（ａ）に示すように、その板厚ｔ２が台金２の板厚ｔ１より所定寸法大きい刃部４ａが形成される。  Next, when the base metal 2 is set, the power source 7 is operated to pass a current for a predetermined time between the molding die 5 and the base metal 2 to energize and heat the blade forming portion 2b of the base metal 2, and the blade forming portion. When 2b is heated to a predetermined temperature, the molding die 5 is lowered by a predetermined distance L as shown by an arrow A in FIG. By the lowering of the molding die 5, the heated blade forming portion 2b of the base metal 2 is compression-molded, and the thickness t2 of the base metal 2 is predetermined from the thickness t1 of the base metal 2 as shown in FIG. A blade portion 4a having a large dimension is formed.

そして、圧縮成形により刃部４ａが形成されたら、図２（ｄ）の矢印ロに示す如く成形金型５を上昇させると共に、押さえ６を台金２から離間させて台金２を成形金型５や押さえ６から取り外す。次に、この取り外した台金２の刃部４ａを焼き入れして、その硬度をＨＲＣ６０＋−以上に設定すると共に図示しないハンマーにより台金２の歪み取りを行い、その後、刃部４ａの側面や外周面等を研磨すると共に、刃部４ａや台金２に塗装を施し、図５（ｂ）に示すような刃４を形成する。これにより、台金２の外周縁部２ａに刃４が一体成形された回転刃１が製造される。  When the blade portion 4a is formed by compression molding, the molding die 5 is raised as shown by the arrow b in FIG. 2 (d), and the presser 6 is separated from the base metal 2 to form the base metal 2 into the molding die. Remove from 5 and presser 6. Next, the removed blade portion 4a of the base metal 2 is quenched, the hardness thereof is set to HRC60 + − or higher, and the base metal 2 is distorted with a hammer (not shown). The outer peripheral surface and the like are polished, and the blade portion 4a and the base metal 2 are coated to form the blade 4 as shown in FIG. Thereby, the rotary blade 1 in which the blade 4 is integrally formed on the outer peripheral edge 2a of the base metal 2 is manufactured.

つまり、回転刃１が、台金プレス成形、台金焼き入れ、台金焼き戻し、台金表面研磨、刃成形、刃焼き入れ、歪み取り、刃研磨、塗装の各工程により製造されることになる。なお、以上の説明における工程は一例であって、その工程順を一部入れ替えることもできるし、工程の一部削除や他の工程の追加等、設備状況等に応じて適宜に変更することができる。  That is, the rotary blade 1 is manufactured by each process of base metal press molding, base metal quenching, base metal tempering, base metal surface polishing, blade molding, blade quenching, distortion removal, blade polishing, and coating. Become. In addition, the process in the above description is an example, Comprising: The process order can be partly changed, and it can be changed appropriately according to the equipment situation etc., such as partial deletion of a process or addition of other processes. it can.

この回転刃１によれば、台金２の取付穴３を図示しない刈払い機の回転軸に装着してエンジンを作動させると、回転刃１が図１の矢印ハ方向に所定回転数で回転して、台金２の外周縁部２ａの各刃４によって例えば雑草や雑木等が刈り払いされる。この刈払い作業時において、各刃４が台金２にその板厚ｔ２が幅広状態で一体成形されると共に、刃４や台金２の硬度が所定に設定されていることから、従来のチップソーと同等の切れ味を得ることができると共に、刃４の飛散等が確実に防止されることになる。  According to this rotary blade 1, when the mounting hole 3 of the base metal 2 is mounted on the rotary shaft of a brush cutter (not shown) and the engine is operated, the rotary blade 1 rotates at a predetermined rotational speed in the direction indicated by the arrow C in FIG. Then, for example, weeds, weeds, etc. are cut off by the respective blades 4 of the outer peripheral edge 2a of the base metal 2. During the cutting operation, each blade 4 is integrally formed with the base metal 2 with its plate thickness t2 being wide, and the hardness of the blade 4 and base metal 2 is set to a predetermined value. Can be obtained, and the scattering of the blade 4 can be reliably prevented.

このように、上記実施形態の回転刃１よれば、台金２の外周縁部２ａの刃４が台金２に一体成形により形成されているため、刃４としての従来のチップが不要となり、チップ固着用のフラックス等の使用が不要となって、回転刃１の製造現場の作業環境の改善を図ることができると共に、資源としての銀ロー等を使用する必要がなく、銀資源の有効利用を促進することができる。特に、刃４の板厚ｔ２が台金２の板厚ｔ１より所定寸法大きく設定されると共に、台金２の硬さがＨＲＣ３５＋−以上で刃４の硬さがＨＲＣ６０＋−以上に設定されていることから、一体成形の刃４に従来のチップと同等の硬さを持たせることができて、回転刃１の切れ味をチップを有する回転刃と同等に設定することができる。  Thus, according to the rotary blade 1 of the said embodiment, since the blade 4 of the outer periphery 2a of the base metal 2 is formed by integral molding with the base metal 2, the conventional chip | tip as the blade 4 becomes unnecessary, The use of flux for fixing chips is not necessary, and the working environment of the rotary blade 1 can be improved. In addition, it is not necessary to use silver raw materials as resources, and silver resources can be used effectively. Can be promoted. In particular, the plate thickness t2 of the blade 4 is set to be a predetermined dimension larger than the plate thickness t1 of the base metal 2, and the hardness of the base metal 2 is set to HRC35 +-or more and the hardness of the blade 4 is set to HRC60 +-or more. Therefore, the integrally formed blade 4 can have the same hardness as the conventional tip, and the sharpness of the rotary blade 1 can be set to be equivalent to the rotary blade having the tip.

また、刃４が台金２の外周縁部２ａに一体成形されるため、従来の熟練を有するチップ固着作業が不要になると共に、高価なチップや銀ロー、フラックス等が不要となり部材費を低減させることができ、回転刃１のコストダウンが図れて、消耗品としての回転刃１を安価に提供することが可能となる、また同時に、従来のようにチップの固着ミス等による飛散がなくなり、刈払い作業の安全性を高めることができると共に、刃４の重量を従来のチップより軽く設定することができて、回転刃１自体の軽量化が図れ、刈払い作業時の作業者の負担を軽減させること等ができる。  In addition, since the blade 4 is integrally formed with the outer peripheral edge 2a of the base metal 2, the conventional chip fixing work with skill is not required, and expensive chips, silver solder, flux, etc. are not required and the member cost is reduced. The cost of the rotary blade 1 can be reduced, and it becomes possible to provide the rotary blade 1 as a consumable item at a low cost. The safety of the mowing work can be enhanced, and the weight of the blade 4 can be set lighter than the conventional chip, so that the rotary blade 1 itself can be reduced in weight, and the burden on the operator during the mowing work is reduced. It can be reduced.

さらに、台金２の刃形成部２ｂの加熱が直接通電加熱で行われるため、刃形成部２ｂの加熱を効率的に行うことができて、回転刃１の製造コストの一層の低減化を図ることができると共に、例えば各工程を自動化することにより、刃４を台金２に機械的に形成することができ、これらのことから、回転刃１自体のコストを一層低減させることが可能となる。  Furthermore, since the heating of the blade forming portion 2b of the base metal 2 is performed by direct current heating, the blade forming portion 2b can be efficiently heated and the manufacturing cost of the rotary blade 1 can be further reduced. In addition, the blade 4 can be mechanically formed on the base metal 2 by, for example, automating each process, and thus, the cost of the rotary blade 1 itself can be further reduced. .

なお、上記実施形態においては、台金２の刃形成部２ｂの加熱を直接通電加熱により行ったが、例えば図２（ａ）の二点鎖線で示すように、刃形成部２ｂの近傍に加熱コイル８を配置し、この加熱コイル８に低周波、中周波あるいは高周波の電流を流して、刃形成部２ｂを誘導加熱等により間接通電加熱するようにしても良い。このような誘導加熱を利用すれば、刃形成部２ｂを成形温度まで瞬時に加熱できて、回転刃１の製造能率を一層向上させることができる。  In the above embodiment, the blade forming portion 2b of the base metal 2 is heated by direct current heating. However, as shown by a two-dot chain line in FIG. 2A, for example, heating is performed in the vicinity of the blade forming portion 2b. A coil 8 may be disposed, and a low frequency, medium frequency, or high frequency current may be passed through the heating coil 8 to indirectly heat the blade forming portion 2b by induction heating or the like. By using such induction heating, the blade forming portion 2b can be instantaneously heated to the molding temperature, and the production efficiency of the rotary blade 1 can be further improved.

また、上記実施形態においては、台金２の刃形成部２ｂを加熱して圧縮成形したが、例えば加熱せずに金型により圧縮成形する冷間加工方式を採用することも可能である。さらに、上記実施形態における、台金２の全体形状、刃４の数やその形状、加熱方法等は一例であって、たとえば加熱方法としてバーナを使用する等、本発明に係わる各発明の要旨を逸脱しない範囲において適宜に変更することができる。  Moreover, in the said embodiment, although the blade formation part 2b of the base metal 2 was heated and compression-molded, it is also possible to employ | adopt the cold working system which compresses by a metal mold | die, for example, without heating. Further, the overall shape of the base metal 2, the number and shape of the blades 4, the heating method, and the like in the above embodiment are examples, and the gist of each invention related to the present invention, such as using a burner as the heating method, is provided. Changes can be made as appropriate without departing from the scope.

本発明は、台金の外周縁部に刃が形成されて刈払い機に取り付けられる全ての回転刃に適用できる。  The present invention can be applied to all rotary blades that are attached to a brush cutter with a blade formed on the outer peripheral edge of the base metal.

本発明に係わる刈払い用回転刃の平面図  Plan view of a rotary blade for brush cutting according to the present invention 同その製造方法の一例を示す工程説明図  Process explanatory drawing showing an example of the manufacturing method 同その説明図  Explanation of the same 同他の説明図  Other explanatory diagrams 同刃の斜視図  Perspective view of the blade

符号の説明Explanation of symbols

１・・・・刈払い用回転刃、２・・・・台金、２ａ・・・外周縁部、２ｂ・・・・刃形成部、３・・・取付穴、４・・・刃、４ａ・・・刃部、５・・・成形金型、５ａ・・・成形用凹部、５ｂ・・・・支持部、６・・・押さえ、６ａ・・・嵌合溝、７・・・電源、８・・・加熱コイル。  DESCRIPTION OF SYMBOLS 1 .... Rotary blade for brush cutting, 2 .... Base metal, 2a ... Outer peripheral edge part, 2b ... Blade forming part, 3 ... Mounting hole, 4 ... Blade, 4a ... Blade part, 5 ... Mold, 5a ... Molding recess, 5b ... Support part, 6 ... Presser, 6a ... Fitting groove, 7 ... Power supply, 8: Heating coil.

Claims (4)

円板状の台金の中心位置に刈払い機への取付穴が形成されると共に外周縁部に多数の刃が形成された刈払い用回転刃であって、
前記刃は、台金の外周縁部を圧縮成形することにより、台金の板厚より大きな厚みを有して台金に一体成形されていることを特徴とする刈払い用回転刃。A rotary blade for brush cutting in which a mounting hole to the brush cutter is formed at the center position of the disk-shaped base metal and a plurality of blades are formed on the outer peripheral edge portion,
A rotary blade for brush cutting, wherein the blade has a thickness larger than the thickness of the base metal and is integrally formed with the base metal by compressing the outer peripheral edge of the base metal. 前記台金の硬さがＨＲＣ３５＋−以上で前記刃の硬さがＨＲＣ６０＋−以上に設定されていることを特徴とする請求項１に記載の刈払い用回転刃。  The rotary blade for brush cutting according to claim 1, wherein the hardness of the base metal is set to HRC35 +-or more and the hardness of the blade is set to HRC60 +-or more. 中心位置に刈払い機への取付穴が形成されると共に外周縁部に多数の刃形成部が形成された円板状の台金をセットする工程と、該セットされた台金の刃形成部を加熱する工程と、該加熱された刃形成部を圧縮成形することにより台金の板厚より大きな厚みを有する刃を一体成形する工程と、を備えることを特徴とする刈払い用回転刃の製造方法。  A step of setting a disk-shaped base metal in which a mounting hole to the brush cutter is formed at the center position and a large number of blade forming parts are formed on the outer peripheral edge, and the blade forming part of the set base metal And a step of integrally forming a blade having a thickness larger than the thickness of the base metal by compression molding the heated blade forming portion. Production method. 前記加熱する工程が直接通電加熱もしくは間接通電加熱で行われることを特徴とする請求項３に記載の刈払い用回転刃の製造方法。  The method for manufacturing a rotary blade for brush cutting according to claim 3, wherein the heating step is performed by direct current heating or indirect current heating.
JP2007132137A 2007-04-17 2007-04-17 Rotating blade for mowing and manufacturing method thereof Active JP4957902B2 (en)

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JPS57115115A (en) * 1980-12-30 1982-07-17 Takefu Tokushu Kozai Kk Base material for circular blade of bush cutter
JPS6328313A (en) * 1986-07-18 1988-02-06 日立工機株式会社 Reaping blade for reaper
JPH06228650A (en) * 1993-02-04 1994-08-16 Miyaden:Kk Method and device for induction-heating mowing tip saw
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