JP3124503U - Circular saw with chip guide surface - Google Patents

Circular saw with chip guide surface Download PDF

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JP3124503U
JP3124503U JP2006004482U JP2006004482U JP3124503U JP 3124503 U JP3124503 U JP 3124503U JP 2006004482 U JP2006004482 U JP 2006004482U JP 2006004482 U JP2006004482 U JP 2006004482U JP 3124503 U JP3124503 U JP 3124503U
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sintered body
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rake face
circular saw
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岳摩 磯谷
保之 神田
嗣典 藤原
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Kanefusa KK
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Abstract

【課題】製品寿命を大幅に向上した切屑誘導面を有した丸鋸を提供する。
【解決手段】台金４２の外周に複数設けた歯体４４にチップ座４６が切欠形成され、このチップ座４６に主として超硬合金からなる硬質チップ４８を接合する。硬質チップ４８の回転方向前面４８ａには、被切削材の切屑を巻くように案内する切屑誘導面５６が形成される。更に、超硬基材５０の上部に凹部５４を形成し、この凹部５４に多結晶ダイヤモンド焼結体６０を備えた刃先部５２が接合される。すなわち、この多結晶ダイヤモンド焼結体６０は、硬質チップ４８における最も摩耗の激しいすくい面６０ｂに位置して、切屑誘導面５６に続くよう設けられる。
【選択図】図２A circular saw having a chip guide surface with significantly improved product life is provided.
A chip seat is cut out in a plurality of tooth bodies provided on an outer periphery of a base metal, and a hard chip mainly made of a cemented carbide is joined to the chip seat. On the front surface 48a in the rotational direction of the hard tip 48, a chip guide surface 56 is formed for guiding the chip of the workpiece to be wound. Further, a concave portion 54 is formed on the upper portion of the cemented carbide substrate 50, and a cutting edge portion 52 including the polycrystalline diamond sintered body 60 is joined to the concave portion 54. In other words, this polycrystalline diamond sintered body 60 is located on the rake face 60 b where the hard tip 48 is most worn, and is provided so as to continue to the chip guiding face 56.
[Selection] Figure 2

Description

この考案は、鉄系または非鉄系金属材料を切断する際に使用される切屑誘導面を有した丸鋸に関するものである。   The present invention relates to a circular saw having a chip guide surface used when cutting ferrous or non-ferrous metallic materials.

超硬合金からなる硬質チップを複数の歯体に各々接合したチップソーが、被切削材を切断加工する際に使用される丸鋸として広く知られている。このような硬質チップを備えた丸鋸において、切削時に生ずる切屑の排出を促すため、硬質チップの回転前面にすくい面とすくい面に続く切屑誘導面が形成されたものがある。図８は、このような切屑誘導面１４を備えた丸鋸１０を拡大して示す図であって、丸鋸本体をなす台金１６の外周に複数(図８では１つのみ図示)設けられた歯体１８に、硬質チップ１２が接合されている。硬質チップ１２のすくい面２０は、該チップ１２の先端に位置する第１すくい面２２と、該第１すくい面２２に続いて鋸中心側に延在する第２すくい面３２とから形成されると共に、第２すくい面３２の下縁に続く切屑誘導面１４が鋸中心側かつ回転前方に向かって延在するよう設けられている。   A tip saw in which hard tips made of cemented carbide are joined to a plurality of tooth bodies, respectively, is widely known as a circular saw used when cutting a workpiece. In some circular saws having such a hard tip, in order to facilitate the discharge of chips generated at the time of cutting, a rake face and a chip guide surface following the rake face are formed on the rotating front surface of the hard tip. FIG. 8 is an enlarged view of the circular saw 10 having such a chip guide surface 14, and a plurality (only one is shown in FIG. 8) is provided on the outer periphery of a base metal 16 constituting the circular saw body. The hard tip 12 is joined to the tooth body 18. The rake face 20 of the hard tip 12 is formed from a first rake face 22 located at the tip of the tip 12 and a second rake face 32 extending to the saw center side following the first rake face 22. At the same time, a chip guide surface 14 following the lower edge of the second rake face 32 is provided so as to extend toward the center of the saw and forward of rotation.

すなわち、この丸鋸１０を用いて被切削材(図示せず)を切断する場合、前記第１すくい面２２で切削された被切削材の切屑は、第２すくい面３２の表面を滑った後切屑誘導面１４で回転前方に押しやられ湾曲する。そして、湾曲した切屑は渦巻き状に巻かれて、スムーズに外部へ排出される。これにより、切屑の排出が滞ることで生じていた硬質チップ１２による切屑の噛み込みや、前記すくい面２０の凝着剥離と云った問題を回避することが可能となり、殊に鉄系・非鉄系材料の切断に効果を上げている(例えば、特許文献１参照)。
特公平７−４９１６８号公報 That is, when cutting the workpiece (not shown) using the circular saw 10, chips of the workpiece cut by the first rake face 22 slide on the surface of the second rake face 32. The chip guide surface 14 is pushed forward and curved. The curved chips are spirally wound and discharged smoothly to the outside. This makes it possible to avoid problems such as chip biting by the hard tip 12 and adhesion peeling of the rake face 20, which have occurred due to the delay in chip discharge, and particularly iron-based and non-ferrous-based. This is effective for cutting materials (for example, see Patent Document 1).
Japanese Examined Patent Publication No. 7-49168

ところで、前記丸鋸１０が使用によって摩耗劣化し、切削能力が低下した場合に、摩耗した硬質チップ１２の刃先を再研磨することで切削能力を回復できることが、省エネ・コストの観点から望ましい。しかしながら、前記丸鋸１０は、前述の如く硬質チップ１２のすくい面２０に続く切屑誘導面１４を有しているので、該チップ１２を研磨すると、刃先(すくい面２０)と切屑誘導面１４との適正な位置関係が崩れてしまい、切屑のスムーズな排出が損なわれてしまう問題がある。従って、このような切屑誘導面１４を有した丸鋸１０は、使用により切削能力が低下した場合に再利用を考慮することなく新たな丸鋸に取り替える、所謂使い切りタイプ(スローアウエイ形式)として使用せざるを得ないのが実情である。このような理由から、切屑誘導面１４を有する丸鋸１０に対しては、製品寿命の向上化が最大の課題となっている。   By the way, it is desirable from the viewpoint of energy saving and cost that the cutting ability can be recovered by re-polishing the cutting edge of the worn hard tip 12 when the circular saw 10 is worn and deteriorated by use and the cutting ability is lowered. However, since the circular saw 10 has the chip guide surface 14 following the rake face 20 of the hard tip 12 as described above, when the tip 12 is polished, the cutting edge (rake face 20), the chip guide surface 14 and There is a problem in that the proper positional relationship is broken and the smooth discharge of chips is impaired. Accordingly, the circular saw 10 having such a chip guide surface 14 is used as a so-called single-use type (slow-away type) in which when a cutting ability is reduced due to use, a new circular saw is replaced without considering reuse. The fact is that we have to do it. For these reasons, the greatest problem for the circular saw 10 having the chip guide surface 14 is to improve the product life.

そこで本考案は、前述した従来技術に内在している前記課題に鑑み、これを好適に解決するべく提案されたものであって、製品寿命を大幅に向上した切屑誘導面を有した丸鋸を提供することを目的とする。   In view of the above-described problems inherent in the prior art, the present invention has been proposed to suitably solve this problem, and a circular saw having a chip guide surface that greatly improves the product life. The purpose is to provide.

前記課題を克服し、所期の目的を達成するため、本考案に係る切屑誘導面を有した丸鋸は、
台金の外周に複数設けた歯体の各々に硬質チップが設けられ、該硬質チップの回転方向前面の外周側にすくい面を形成し、被切削材の切屑を巻くように案内する切屑誘導面が硬質チップにおける前記すくい面の鋸中心側に連続して形成された丸鋸であって、
超硬合金からなる前記硬質チップの最外周部位を多結晶ダイヤモンド(ＰＣＤ)焼結体または窒化硼素(ＣＢＮ)焼結体からなる超硬質焼結体で形成し、前記すくい面を該超硬質焼結体で構成したことを特徴とする。
請求項１の考案によれば、硬質チップの最外周部位を超硬質焼結体で形成して、すくい面を該超硬質焼結体から構成したので、使用による摩耗劣化が劇的に抑制されて製品寿命を大幅に向上させることができる。また、超硬質焼結体は、硬質チップにおける最も摩耗が激しい部分にのみ用いられるので、超硬質焼結体の必要量が最小限度に抑えられ、コストの増加を極力抑制し得る。 In order to overcome the above problems and achieve the intended purpose, a circular saw having a chip guide surface according to the present invention,
A chip guide surface that is provided with a hard tip on each of the tooth bodies provided on the outer periphery of the base metal, forms a rake face on the outer peripheral side of the front surface in the rotation direction of the hard tip, and guides the chips of the workpiece to be wound. Is a circular saw formed continuously on the saw center side of the rake face in the hard tip,
The outermost peripheral portion of the hard tip made of cemented carbide is formed of a super-hard sintered body made of a polycrystalline diamond (PCD) sintered body or a boron nitride (CBN) sintered body, and the rake face is made of the ultra-hard sintered body. It is characterized by comprising a ligation.
According to the first aspect of the present invention, the outermost peripheral portion of the hard tip is formed of an ultra-hard sintered body, and the rake face is formed of the ultra-hard sintered body. Product life can be greatly improved. In addition, since the ultra-hard sintered body is used only in the hardest part of the hard tip, the required amount of the ultra-hard sintered body can be minimized and the increase in cost can be suppressed as much as possible.

前記課題を克服し、所期の目的を達成するため、本願の別の考案に係る切屑誘導面を有した丸鋸は、
台金の外周に複数設けた歯体の各々に硬質チップが設けられ、該硬質チップの回転方向前面の外周側に位置する第１すくい面と該第１すくい面の鋸中心側に続く第２すくい面とからなるすくい面を硬質チップに形成し、被切削材の切屑を巻くように案内する切屑誘導面が硬質チップにおける前記第２すくい面の鋸中心側に連続して形成された丸鋸であって、
超硬合金からなる前記硬質チップの最外周部位を多結晶ダイヤモンド(ＰＣＤ)焼結体または窒化硼素(ＣＢＮ)焼結体からなる超硬質焼結体で形成し、少なくとも前記第１すくい面を超硬質焼結体で構成したことを特徴とする。
請求項２の考案によれば、前述した請求項１に係る考案と同様な効果に加え、すくい面を第１すくい面と第２すくい面とから形成したので、鉄系の被切削材の切断に殊に好適である。 In order to overcome the above-mentioned problems and achieve the intended purpose, a circular saw having a chip guide surface according to another device of the present application,
A hard tip is provided on each of the plurality of tooth bodies provided on the outer periphery of the base metal, and a second rake face located on the outer peripheral side of the front surface in the rotational direction of the hard tip and a second rake surface following the first rake face side of the first rake face. A circular saw in which a rake face composed of a rake face is formed on a hard tip, and a chip guide surface for guiding the chip of the workpiece to be wound is continuously formed on the side of the saw of the second rake face in the hard tip. Because
The outermost peripheral portion of the hard tip made of cemented carbide is formed of a super-hard sintered body made of a polycrystalline diamond (PCD) sintered body or a boron nitride (CBN) sintered body, and at least the first rake face is super It is characterized by comprising a hard sintered body.
According to the second aspect of the invention, in addition to the same effect as the first aspect of the invention, the rake face is formed of the first rake face and the second rake face, so that the cutting of the iron-based work material is performed. Particularly preferred.

本考案に係る切屑誘導面を有した丸鋸によれば、使用による摩耗劣化が抑制されて製品寿命を大幅に向上させることができる。   According to the circular saw having the chip guide surface according to the present invention, wear deterioration due to use can be suppressed and the product life can be greatly improved.

次に、本考案に係る切屑誘導面を有した丸鋸につき、好適な実施例を挙げて、添付図面を参照しながら以下説明する。   Next, a circular saw having a chip guide surface according to the present invention will be described below with reference to the accompanying drawings with a preferred embodiment.

請求項１に係る考案に対応する実施例１では、超硬質焼結体として、非鉄系金属の切断に好適な多結晶ダイヤモンドを採用した場合について説明する。図１は、実施例１に係る切屑誘導面を有した丸鋸４０の全体図であって、丸鋸４０の主体となる台金４２の外周には、所定間隔で複数の歯体４４が形成されている。図２に示すように、各歯体４４には、丸鋸４０の径方向および回転方向側に開放するチップ座４６が切欠形成され、該チップ座４６に主として超硬合金から形成された硬質チップ４８がろう付け等の接合手段により接合される。なお、硬質チップ４８の説明において、上下とは、図２に示す状態で指称し、前後とは、丸鋸４０の回転方向に対して指称するものとする。   In Example 1 corresponding to the invention according to claim 1, a case will be described in which polycrystalline diamond suitable for cutting a non-ferrous metal is adopted as the ultra-hard sintered body. FIG. 1 is an overall view of a circular saw 40 having a chip guide surface according to the first embodiment, and a plurality of tooth bodies 44 are formed at predetermined intervals on the outer periphery of a base metal 42 which is the main body of the circular saw 40. Has been. As shown in FIG. 2, each tooth body 44 has a notch formed on a chip seat 46 that opens in the radial direction and the rotational direction side of the circular saw 40, and the chip seat 46 is mainly made of a cemented carbide. 48 is joined by joining means such as brazing. In the description of the hard tip 48, “upper and lower” are designated in the state shown in FIG. 2, and “front and rear” are designated with respect to the rotation direction of the circular saw 40.

実施例１に係る硬質チップ４８は、略矩形状の超硬基材５０と刃先部５２とから構成されている。前記超硬基材５０は、図５に示す如く、その上部に前記刃先部５２を収容固定可能な凹部５４が形成されると共に、該凹部５４における前側の縁部５４ａから超硬基材５０の前面部５０ａに掛けて湾曲状の切屑誘導面５６が形成されている。また、前記凹部５４に収容状態で超硬基材５０にろう付けされる刃先部５２は、図３に示す如く、平行六面体状に形成された超硬合金からなる基材５８と、該基材５８の前側に設けられる多結晶ダイヤモンド(ＰＣＤ)焼結体(超硬質焼結体)６０とが一体成形されてなる。すなわち、図２に示すように、前記硬質チップ４８は、該チップ４８において切削時に最も摩耗が激しい部位である回転方向前面４８ａ側の先端部分(最外周部位)に、超硬合金よりも更に硬質な超高圧の焼結体であるＰＣＤ焼結体６０が設けられ、硬質チップ４８における耐摩耗性の大幅な向上が図られている。更に、図２に示すように、前記ＰＣＤ焼結体６０の前側のすくい面６０ｂにおける下縁６０ａと、前記切屑誘導面５６の上縁(前記凹部５４の縁部５４ａ)とが略一致して連続面を形成し、切削時に被切削材６２より生ずる切屑６４のスムーズな排出が実現される(図６参照)。   The hard tip 48 according to the first embodiment includes a substantially rectangular carbide substrate 50 and a blade edge portion 52. As shown in FIG. 5, the cemented carbide substrate 50 is formed with a concave portion 54 capable of accommodating and fixing the cutting edge portion 52 at an upper portion thereof, and the cemented carbide substrate 50 is formed from a front edge 54 a of the concave portion 54. A curved chip guiding surface 56 is formed on the front surface portion 50a. Further, the cutting edge portion 52 brazed to the cemented carbide substrate 50 in the state of being accommodated in the recess 54 includes a substrate 58 made of cemented carbide formed in a parallelepiped shape, and the substrate, as shown in FIG. A polycrystalline diamond (PCD) sintered body (ultra-hard sintered body) 60 provided on the front side of 58 is integrally formed. That is, as shown in FIG. 2, the hard tip 48 is harder than the cemented carbide at the tip end portion (outermost peripheral portion) on the front side 48a in the rotational direction, which is the portion where the wear is most severe when cutting. A PCD sintered body 60 that is a very high-pressure sintered body is provided, and the wear resistance of the hard chip 48 is greatly improved. Furthermore, as shown in FIG. 2, the lower edge 60a of the front rake face 60b of the PCD sintered body 60 and the upper edge of the chip guiding surface 56 (the edge part 54a of the concave part 54) substantially coincide with each other. A continuous surface is formed, and smooth discharge of the chips 64 generated from the workpiece 62 during cutting is realized (see FIG. 6).

ここで、前記刃先部５２の具体的な製造工程について説明すると、図４に示す如く、合成ダイヤモンドの微結晶を高温・高圧で、各種の結合剤と同時に焼結させて得られた多結晶ダイヤモンド(ＰＣＤ)焼結体ブランク６６を準備する。このＰＣＤブランク６６は、例えば直径約７０ｍｍ、厚み約３ｍｍの円盤状で、超硬合金層の基部材５９とＰＣＤ層６１の２層構造からなる。更に、必要であれば、前記超高圧焼結体ブランク６６に鏡面研磨を施すことで、被切削材６２の切屑６４が刃先部５２に溶着するのを抑制することができる。   Here, a specific manufacturing process of the cutting edge portion 52 will be described. As shown in FIG. 4, polycrystalline diamond obtained by sintering synthetic diamond microcrystals simultaneously with various binders at high temperature and high pressure. (PCD) A sintered body blank 66 is prepared. The PCD blank 66 is, for example, a disk shape having a diameter of about 70 mm and a thickness of about 3 mm, and has a two-layer structure of a cemented carbide layer base member 59 and a PCD layer 61. Furthermore, if necessary, it is possible to suppress the chips 64 of the workpiece 62 from being welded to the cutting edge portion 52 by performing mirror polishing on the ultra-high pressure sintered body blank 66.

次に、前記超高圧焼結体ブランク６６を、例えば放電式ワイヤカット法により等間隔で切断する。そして、図４(ｂ)に示す如く、等間隔で切り出された分割体６７に対し、同じく放電式ワイヤカット法により、所要の傾斜角度θで等間隔毎に切断することで、先端部にＰＣＤ焼結体６０を有した平行六面体状の刃先部５２が複数作成される(図４(ｃ)参照)。ここで、ＰＣＤ焼結体６０は、鉄系金属よりも硬度の低い、例えば、アルミニウム合金等の非鉄金属材の切削に殊に好適に使用されるため、図３に示すように、ＰＣＤ焼結体６０のすくい角αはプラス側(正)に設定されている。すなわち、図４(ｂ)に示す分割体６７に対するワイヤーの切断入射角度θによって、硬質チップ４８のすくい角αが規定されることになる。   Next, the ultra-high pressure sintered body blank 66 is cut at regular intervals by, for example, a discharge wire cutting method. Then, as shown in FIG. 4B, the divided body 67 cut out at equal intervals is cut at equal intervals at the required inclination angle θ by the same discharge wire cutting method, so that the PCD is formed at the tip portion. A plurality of parallelepiped cutting edge portions 52 having a sintered body 60 are created (see FIG. 4C). Here, since the PCD sintered body 60 is particularly preferably used for cutting a non-ferrous metal material having a hardness lower than that of a ferrous metal, for example, an aluminum alloy, as shown in FIG. The rake angle α of the body 60 is set to the plus side (positive). That is, the rake angle α of the hard tip 48 is defined by the cutting incident angle θ of the wire with respect to the divided body 67 shown in FIG.

上記工程によって形成された刃先部５２は、前記超硬基材５０の凹部５４に着座固定される。ここで、刃先部５２の接合に際しては、一般的なチップソーの接合に採用されるような高周波銀ろう付けでは強度不足となるため、例えば、高融点のインサートメタル材を使用して刃先部５２を接合している。すなわち、刃先部５２と超硬基材５０との接合に際しては、銀ろう付けよりも高融点を有するインサートメタルを使用し、ろう付け、レーザー溶接または抵抗溶接等にの方法で溶接される。前述したように、前記ＰＣＤ焼結体６０のすくい面６０ｂと、前記切屑誘導面５６とが略連続面を形成するよう構成することで、切削時の切屑６４が切屑誘導面５６を介して効率的に排出されるようになっている。   The cutting edge portion 52 formed by the above process is seated and fixed in the concave portion 54 of the cemented carbide substrate 50. Here, when joining the blade edge portion 52, the high frequency silver brazing used for joining general tip saws is insufficient in strength. For example, the blade edge portion 52 is formed using an insert metal material having a high melting point. It is joined. That is, when the cutting edge portion 52 and the cemented carbide substrate 50 are joined, an insert metal having a higher melting point than silver brazing is used, and welding is performed by a method such as brazing, laser welding, or resistance welding. As described above, the rake face 60b of the PCD sintered body 60 and the chip guiding surface 56 are configured to form a substantially continuous surface, so that the chips 64 at the time of cutting are efficiently passed through the chip guiding surface 56. Are being discharged.

なお、超硬基材５０に切屑誘導面５６や凹部５４を形成するに際しても、前述の放電式ワイヤーカット法による成形加工が殊に好適である。また、アルミニウム合金等の軟質金属切削には、従来技術の説明で述べた負のすくい角の第１すくい面２２を設ける必要はなく、正のすくい角をなす第２すくい面３２に対応する単一のすくい面６０ｂのみを硬質チップ４８に設ければよい。しかしながら、硬質金属切削の場合、耐刃欠け性の向上の観点から、前記すくい面６０ｂの上部を研磨して、負のすくい角を有する第２のすくい面を形成するのが望ましい。更に、必要な場合、刃先部５２の上部を研磨して、該刃先部５２の先端逃げ角βが研磨する前の先端逃げ角β'に比べて若干小さくなるようにしてもよい(図３参照)。これにより、切削時に生ずる刃先部５２の先端の耐欠け性を更に向上させることができる。更に、超硬基材５０の材質は、前記基材５８と同じＷＣ焼結体が採用される。   In addition, when forming the chip | tip guidance surface 56 and the recessed part 54 in the cemented carbide base material 50, the shaping | molding process by the above-mentioned electric discharge type wire cut method is especially suitable. In addition, when cutting a soft metal such as an aluminum alloy, it is not necessary to provide the first rake face 22 having the negative rake angle described in the description of the prior art, but a single rake face corresponding to the second rake face 32 having a positive rake angle. Only one rake face 60b may be provided on the hard chip 48. However, in the case of hard metal cutting, it is desirable to polish the upper part of the rake face 60b to form a second rake face having a negative rake angle from the viewpoint of improving the chip resistance. Further, if necessary, the upper portion of the blade edge portion 52 may be polished so that the tip clearance angle β of the blade edge portion 52 is slightly smaller than the tip clearance angle β ′ before polishing (see FIG. 3). ). Thereby, the chipping resistance of the tip of the blade edge portion 52 generated during cutting can be further improved. Furthermore, the same WC sintered body as that of the substrate 58 is adopted as the material of the cemented carbide substrate 50.

(実施例１の作用)
次に、実施例１に係る切屑誘導面を有した丸鋸の作用について、アルミニウム合金からなる被切削材６２を切断する場合を例に説明する。所要の回転速度で回転する丸鋸４０を被切削材６２に接近させると、硬質チップ４８における最外周部位、すなわち刃先部５２のＰＣＤ焼結体６０が被切削材６２に最も早く到達する(図６(ａ)参照)。すると、被切削材６２は、刃先部５２によって切り込まれ、その表面が切屑６４として削り出される。更に被切削材６２が切り込まれると、図６(ｂ)に示すように、切屑６４がＰＣＤ焼結体６０のすくい面６０ｂおよび超硬基材５０の切屑誘導面５６に案内されて渦巻き状に巻かれる。そして、被切削材６２を切り込んでいた硬質チップ４８が該被切削材６２から離れると、図６(ｃ)に示す如く、渦巻き状に巻かれた切屑６４が被切削材６２から離脱して、丸鋸４０の外部へスムーズに排出される。 (Operation of Example 1)
Next, the operation of the circular saw having the chip guide surface according to the first embodiment will be described by taking as an example the case of cutting the workpiece 62 made of an aluminum alloy. When the circular saw 40 rotating at a required rotational speed is brought close to the workpiece 62, the outermost peripheral portion of the hard tip 48, that is, the PCD sintered body 60 of the cutting edge portion 52 reaches the workpiece 62 earliest (see FIG. 6 (a)). Then, the workpiece 62 is cut by the cutting edge portion 52 and the surface thereof is cut out as chips 64. When the workpiece 62 is further cut, as shown in FIG. 6 (b), the chips 64 are guided by the rake face 60 b of the PCD sintered body 60 and the chip guide surface 56 of the cemented carbide substrate 50 to form a spiral shape. Wrapped around. Then, when the hard tip 48 that has cut the workpiece 62 is separated from the workpiece 62, as shown in FIG. 6C, the spirally wound chips 64 are detached from the workpiece 62, It is smoothly discharged to the outside of the circular saw 40.

ここで、実施例１に係る丸鋸４０においては、硬質チップ４８における最も切削に寄与する部位であるすくい面６０ｂは、超硬合金よりも硬質で耐摩耗性に極めて優れたＰＣＤ焼結体６０により形成されている。従って、ＰＣＤ焼結体６０を使用していない従来の丸鋸に比べて使用による摩耗が極めて少なく、製品寿命を大幅に伸ばすことが可能となる。また、ＰＣＤ焼結体６０は一般の超硬合金材に比べて高価であるが、実施例１に係る丸鋸４０にあっては、摩耗が最も激しい部位にのみピンポイントでＰＣＤ焼結体６０を使用するので、ＰＣＤ焼結体６０の使用量は最小限度に抑えられる。これにより、丸鋸４０の製品コストの増加を極力抑制することが可能となる。   Here, in the circular saw 40 according to the first embodiment, the rake face 60b, which is the part that contributes most to the cutting in the hard tip 48, is harder than the cemented carbide and has extremely excellent wear resistance. It is formed by. Therefore, compared to a conventional circular saw that does not use the PCD sintered body 60, wear due to use is extremely small, and the product life can be greatly extended. The PCD sintered body 60 is more expensive than a general cemented carbide material. However, in the circular saw 40 according to the first embodiment, the PCD sintered body 60 is pinpointed only at a portion where the wear is most severe. Therefore, the usage amount of the PCD sintered body 60 can be minimized. Thereby, it becomes possible to suppress the increase in the product cost of the circular saw 40 as much as possible.

なお、実施例１では、前記超硬基材５０および基材５８を、共に同じ超硬合金(ＷＣ焼結体)から形成した場合を示したが、両者を異なる超硬合金から形成してもよい。また、実施例１では、刃先部５２や超硬基材５０を成形加工する際に、放電式ワイヤカット法を採用した場合を示したが、例えば、レーザーカット装置等により加工するようにしてもよい。更に、超硬基材５０の凹部５４や切屑誘導面５６については、上記方法に加えて金型焼結により形成することも可能である。また、実施例１では、超硬質焼結体としてＰＣＤ焼結体６０を採用した場合を示したが、窒化硼素(ＣＢＮ)焼結体を採用することも可能である。   In Example 1, the case where both the cemented carbide substrate 50 and the substrate 58 are formed from the same cemented carbide (WC sintered body) is shown. Good. Further, in the first embodiment, the case where the discharge wire cutting method is adopted when the cutting edge portion 52 and the cemented carbide substrate 50 are molded is shown. However, for example, the cutting may be performed by a laser cutting device or the like. Good. Further, the concave portion 54 and the chip guiding surface 56 of the cemented carbide substrate 50 can be formed by die sintering in addition to the above method. In the first embodiment, the PCD sintered body 60 is used as the ultra-hard sintered body. However, a boron nitride (CBN) sintered body can also be used.

次に、本考案の請求項２に係る発明が対応する実施例２について、以下説明を行なう。前述した実施例１では、超硬質焼結体としてＰＣＤ焼結体６０を採用して、アルミニウム合金等の非鉄系金属の切断に好適な丸鋸４０について説明したが、鉄系金属材を切断する際には、超硬質焼結体として立法晶窒化硼素(ＣＢＮ)焼結体を採用することが推奨される。図７は、ＣＢＮ焼結体７０を採用した実施例２に係る丸鋸７２の一部を拡大して示している。この丸鋸７２は、基本的に実施例１の丸鋸４０と同様な構成であって、各歯体４４にろう付けされた硬質チップ７６の超硬基材５０に凹部５４が形成され、該凹部５４に刃先部８２が接合されている。そして、この刃先部８２の前側に第１すくい面７０ｂ1を形成する前記ＣＢＮ焼結体７０が設けられている。すなわち、実施例２の丸鋸７２は、硬質チップ７６における最外周部位が、ＣＢＮ焼結体７０によって形成されている。 Next, Embodiment 2 to which the invention according to claim 2 of the present invention corresponds will be described below. In the above-described first embodiment, the PCD sintered body 60 is employed as the ultra-hard sintered body and the circular saw 40 suitable for cutting non-ferrous metal such as aluminum alloy has been described. However, the iron-based metal material is cut. In this case, it is recommended to adopt a cubic boron nitride (CBN) sintered body as the ultra-hard sintered body. FIG. 7 shows an enlarged part of a circular saw 72 according to the second embodiment that employs the CBN sintered body 70. The circular saw 72 is basically configured in the same manner as the circular saw 40 of the first embodiment, and a concave portion 54 is formed in a cemented carbide substrate 50 of a hard tip 76 brazed to each tooth body 44. The blade edge portion 82 is joined to the recess 54. The CBN sintered body 70 that forms the first rake face 70b 1 is provided on the front side of the cutting edge portion 82. That is, in the circular saw 72 of the second embodiment, the outermost peripheral portion of the hard tip 76 is formed by the CBN sintered body 70.

前記第１すくい面７０ｂ1は、従来技術で説明した第１すくい面２２と同様に、負のすくい角に設定されている。また、前記硬質チップ７６の回転方向前面７６ａには、第２すくい面７０ｂ2および切屑誘導面５６が形成されている。この第２すくい面７０ｂ2は、前記第１すくい面７０ｂ1の下方(鋸中心側)に位置するよう設けられ、正のすくい角に設定されている。すなわち、実施例２に係る丸鋸７２においては、２つの第１すくい面７０ｂ1および第２すくい面７０ｂ2によって硬質チップ７６のすくい面７０ｂが構成されている。そして、前記すくい面７０ｂのうち少なくとも第１すくい面７０ｂ1をＣＢＮ焼結体７０で構成するようになっている。更に実施例１で示した丸鋸４０と同様に、前記第２すくい面７０ｂ2の鋸中心側に連続して切屑誘導面５６が形成され、前記切屑６４のスムーズな排出が実現されている。 The first rake face 70b 1 is set to a negative rake angle, like the first rake face 22 described in the prior art. Further, a second rake face 70b 2 and a chip guide face 56 are formed on the front face 76a in the rotational direction of the hard chip 76. The second rake face 70b 2 is provided below the first rake face 70b 1 (on the saw center side) and is set to a positive rake angle. That is, in the circular saw 72 according to the second embodiment, the rake face 70b of the two first rake face 70b 1 and the second rake face 70b 2 by the hard tip 76 is formed. In addition, at least the first rake face 70 b 1 of the rake face 70 b is configured by the CBN sintered body 70. Further similarly to the circular saw 40 shown in Example 1, the second rake face 70b 2 of the saw center continuously to side chip deflecting surface 56 is formed, a smooth discharge of the chip 64 is realized.

このように実施例２に係る丸鋸７２は、硬質チップ７６において最も摩耗の激しい部位であるすくい面７０ｂのうち、少なくとも最外周側に位置する第１すくい面７０ｂ1をＣＢＮ焼結体７０で形成した。このＣＢＮ焼結体７０は、ＣＢＮの微結晶を超高圧下において加熱して得られる多結晶焼結体であって、主として、耐熱鋼等の難削材料の切削加工に好適に使用される。なお、刃先部８２の製造工程は、基本的に実施例１で示したものと同じであるが、図７から明らかなように、実施例２に係る丸鋸７２のすくい角αは、前述したようにマイナス側(負)に設定さたネガすくい角(第１すくい角)となっている。すなわち、硬質の鉄系金属を切削する場合に硬質チップ７６(刃先部８２)に加わる負荷は、アルミニウム材等を切削する実施例１の丸鋸４０に比べて大きいので、すくい角αをマイナスに逃がすことで硬質チップ７６の耐刃欠け性を向上させている。具体的なすくい角αの値については、約０°〜６０°の範囲であるのが望ましい。また、ＣＢＮ焼結体７０の厚み寸法Ｌ(図３参照)は、約０.２〜２ｍｍの値であるのが望ましい。 Thus, in the circular saw 72 according to the second embodiment, the first rake face 70b 1 positioned at least on the outermost peripheral side of the rake face 70b that is the most severely worn part of the hard tip 76 is formed by the CBN sintered body 70. Formed. The CBN sintered body 70 is a polycrystalline sintered body obtained by heating CBN microcrystals under an ultra-high pressure, and is mainly suitably used for cutting difficult-to-cut materials such as heat-resistant steel. The manufacturing process of the cutting edge portion 82 is basically the same as that shown in the first embodiment. However, as is apparent from FIG. 7, the rake angle α of the circular saw 72 according to the second embodiment is as described above. Thus, the negative rake angle (first rake angle) is set to the negative side (negative). That is, when cutting hard iron-based metal, the load applied to the hard tip 76 (blade tip 82) is larger than that of the circular saw 40 of Example 1 that cuts aluminum material or the like, so the rake angle α is made negative. By escaping, the chip resistance of the hard tip 76 is improved. The specific rake angle α is preferably in the range of about 0 ° to 60 °. The thickness dimension L (see FIG. 3) of the CBN sintered body 70 is preferably about 0.2 to 2 mm.

以上に示したように、実施例２に係る丸鋸７２においては、超硬質焼結体としてＣＢＮ焼結体７０を採用したので、鉄系金属等の難削材料であっても好適に切断することができる。また、ＣＢＮ焼結体７０は、硬質チップ７６のうち最も摩耗が激しい部位にのみ使用されているので、必要なＣＢＮ焼結体７０は最小限度に抑えられ、丸鋸７２の製品コストの高騰は抑制される。   As described above, in the circular saw 72 according to the second embodiment, the CBN sintered body 70 is used as the ultra-hard sintered body, so that even a difficult-to-cut material such as an iron-based metal is suitably cut. be able to. In addition, since the CBN sintered body 70 is used only in the hardest part of the hard tip 76, the necessary CBN sintered body 70 can be minimized and the product cost of the circular saw 72 is increased. It is suppressed.

なお、実施例２に係る丸鋸７２では、第１すくい面７０ｂ1を超硬質焼結体であるＣＢＮ焼結体７０で構成した場合を示したが、第１すくい面７０ｂ1に加えて、第２すくい面７０ｂ2もＣＢＮ焼結体７０で構成してもよい。また、超硬質焼結体としては、ＣＢＮ焼結体７０でなく、実施例１で示した多結晶ダイヤモンド(ＰＣＤ)焼結体を採用することも可能である。 In the circular saw 72 according to the second embodiment, the case where the first rake face 70b 1 is configured by the CBN sintered body 70 that is an ultra-hard sintered body is shown, but in addition to the first rake face 70b 1 , The second rake face 70b 2 may also be composed of the CBN sintered body 70. Further, as the ultra-hard sintered body, it is also possible to adopt the polycrystalline diamond (PCD) sintered body shown in Example 1 instead of the CBN sintered body 70.

実施例１に係る丸鋸を示す全体図である。1 is an overall view showing a circular saw according to Embodiment 1. FIG. 実施例１に係る丸鋸の歯体を示す拡大図である。It is an enlarged view which shows the tooth body of the circular saw which concerns on Example 1. FIG. 実施例１に係る刃先部を示す拡大図である。FIG. 3 is an enlarged view showing a blade edge part according to the first embodiment. 刃先部の製造工程を示す概略図であって、(ａ)は円盤状の超高圧焼結体ブランクを示し、(ｂ)は所定幅で切り出した状態の分割体を示し、(ｃ)は分割体から切り出された刃先部を示している。It is the schematic which shows the manufacturing process of a blade edge | tip part, (a) shows a disk-shaped ultrahigh pressure sintered compact blank, (b) shows the division body of the state cut out by predetermined width, (c) is division | segmentation. The cutting edge part cut out from the body is shown. 実施例１に係る超硬基材を示す拡大図である。1 is an enlarged view showing a cemented carbide substrate according to Example 1. FIG. 実施例１に係る丸鋸で被切削材を切削する様子を示す拡大説明図であって、(ａ)は被切削材に硬質チップが接触した状態を示し、(ｂ)は被切削材を切り込んだ状態を示し、(ｃ)は硬質チップが被切削材から離脱して渦巻き状の切屑が排出される状態を示す。BRIEF DESCRIPTION OF THE DRAWINGS It is an expanded explanatory view which shows a mode that a cut material is cut with the circular saw which concerns on Example 1, Comprising: (a) shows the state which the hard tip contacted the cut material, (b) cuts the cut material (C) shows a state where the hard tip is detached from the work material and spiral chips are discharged. 実施例２に係る丸鋸を示す一部拡大図である。6 is a partially enlarged view showing a circular saw according to Embodiment 2. FIG. 従来の切屑誘導面を有した丸鋸を示す一部拡大図である。It is a partially enlarged view showing a circular saw having a conventional chip guide surface.

符号の説明Explanation of symbols

４２ 台金
４４ 歯体
４８ 硬質チップ(実施例１)
４８ａ 回転方向前面(実施例１)
５６ 切屑誘導面
６０ ＰＣＤ焼結体(超硬質焼結体)
６０ｂ すくい面(実施例１)
６２ 被切削材
６４ 切屑
７０ ＣＢＮ焼結体(超硬質焼結体)
７０ｂ すくい面(実施例２)
７０ｂ1 第１すくい面
７０ｂ2 第２すくい面
７６ 硬質チップ(実施例２)
７６ａ 回転方向前面(実施例２)
42 Base metal 44 Tooth body 48 Hard tip (Example 1)
48a Front direction of rotation (Example 1)
56 Chip guiding surface 60 PCD sintered body (super hard sintered body)
60b Rake face (Example 1)
62 Work Material 64 Chip 70 CBN Sintered Body (Super Hard Sintered Body)
70b Rake face (Example 2)
70b 1 First rake face 70b 2 Second rake face 76 Hard tip (Example 2)
76a Front direction of rotation (Example 2)

Claims (2)

台金(42)の外周に複数設けた歯体(44)の各々に硬質チップ(48)が設けられ、該硬質チップ(48)の回転方向前面(48a)の外周側にすくい面(60b)を形成し、被切削材(62)の切屑(64)を巻くように案内する切屑誘導面(56)が硬質チップ(48)における前記すくい面(60b)の鋸中心側に連続して形成された丸鋸であって、
超硬合金からなる前記硬質チップ(48)の最外周部位を多結晶ダイヤモンド(ＰＣＤ)焼結体または窒化硼素(ＣＢＮ)焼結体からなる超硬質焼結体(60)で形成し、前記すくい面(60b)を該超硬質焼結体(60)で構成した
ことを特徴とする切屑誘導面を有した丸鋸。 A hard tip (48) is provided on each of the tooth bodies (44) provided on the outer periphery of the base metal (42), and a rake face (60b) is provided on the outer peripheral side of the front surface (48a) in the rotational direction of the hard tip (48). A chip guide surface (56) for guiding the chip (64) of the workpiece (62) to be wound is formed continuously on the saw center side of the rake face (60b) in the hard tip (48). A circular saw,
The outermost peripheral portion of the hard chip (48) made of cemented carbide is formed of a superhard sintered body (60) made of a polycrystalline diamond (PCD) sintered body or a boron nitride (CBN) sintered body, and the rake A circular saw having a chip guiding surface, wherein the surface (60b) is composed of the super-hard sintered body (60). 台金(42)の外周に複数設けた歯体(44)の各々に硬質チップ(76)が設けられ、該硬質チップ(76)の回転方向前面(76a)の外周側に位置する第１すくい面(70b1)と該第１すくい面(70b1)の鋸中心側に続く第２すくい面(70b2)とからなるすくい面(70b)を硬質チップ(76)に形成し、被切削材(62)の切屑(64)を巻くように案内する切屑誘導面(56)が硬質チップ(76)における前記第２すくい面(70b2)の鋸中心側に連続して形成された丸鋸であって、
超硬合金からなる前記硬質チップ(76)の最外周部位を多結晶ダイヤモンド(ＰＣＤ)焼結体または窒化硼素(ＣＢＮ)焼結体からなる超硬質焼結体(70)で形成し、少なくとも前記第１すくい面(70b1)を超硬質焼結体(70)で構成した
ことを特徴とする切屑誘導面を有した丸鋸。
A hard tip (76) is provided on each of a plurality of tooth bodies (44) provided on the outer periphery of the base metal (42), and the first scoop located on the outer peripheral side of the front surface (76a) in the rotational direction of the hard tip (76). A rake face (70b) composed of a face (70b 1 ) and a second rake face (70b 2 ) following the first rake face (70b 1 ) on the saw center side is formed on a hard tip (76), A circular saw formed by a chip guide surface (56) for guiding the chips (64) of (62) to be wound continuously on the saw center side of the second rake face (70b 2 ) of the hard tip (76). There,
The outermost peripheral portion of the hard chip (76) made of cemented carbide is formed of a super-hard sintered body (70) made of a polycrystalline diamond (PCD) sintered body or a boron nitride (CBN) sintered body, and at least the above-mentioned A circular saw having a chip guiding surface, characterized in that the first rake face (70b 1 ) is composed of a super-hard sintered body (70).
JP2006004482U 2006-06-09 2006-06-09 Circular saw with chip guide surface Expired - Lifetime JP3124503U (en)

Priority Applications (1)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020001098A (en) * 2018-06-25 2020-01-09 株式会社アマダホールディングス Saw blade

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020001098A (en) * 2018-06-25 2020-01-09 株式会社アマダホールディングス Saw blade
JP7097242B2 (en) 2018-06-25 2022-07-07 株式会社アマダ Saw blade

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