JP2009214250A

JP2009214250A - Circular saw for metal cutting

Info

Publication number: JP2009214250A
Application number: JP2008061995A
Authority: JP
Inventors: Yoshitaka Tsune; 良孝津根
Original assignee: Tsune Seiki Co Ltd
Current assignee: Tsune Seiki Co Ltd
Priority date: 2008-03-12
Filing date: 2008-03-12
Publication date: 2009-09-24

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circular saw for metal cutting capable of reducing abrasion by reducing contact of a workpiece material and a side flank as much as possible, increasing resistance against chipping and cutting of a cutting blade tip, effectively preventing chapping, etc. of a cutting surface and drastically extending a life span of the circular saw. <P>SOLUTION: A blade body 14 is formed for each of pitches on an outer peripheral edge of a disk type base metal 12, and the cutting blade tip 20 is respectively fastened on each of the blade bodies 14. Stepped parts 30 formed in the rear in the rotating direction of the blade bodies 14 and formed so that an interval of them between the both side flanks 28 becomes narrow are furnished on the both side flanks 28 connected to both sides of an outer peripheral flank 32 of each of the cutting blade tips 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、鉄鋼材料や非鉄金属材料などの金属材料を切断する際に使用する金属切断用丸鋸に関する。 The present invention relates to a circular saw for metal cutting used when cutting a metal material such as a steel material or a non-ferrous metal material.

従来、この種の金属切断用丸鋸としては、切刃チップが円盤形状の丸鋸本体外周に、径方向外方に突出してろう付けされたものがある。この丸鋸は、特許文献１，２に記載されているように、円板状の台金の外周縁に沿って所定ピッチに形成された刃体を備え、各刃体は、台金のチップ座にロウ付けされ固着された切刃チップから成る。 Conventionally, as this type of metal cutting circular saw, there is one in which a cutting edge tip is brazed to protrude radially outward on the outer periphery of a disk-shaped circular saw body. As described in Patent Documents 1 and 2, this circular saw includes blade bodies formed at a predetermined pitch along the outer peripheral edge of a disk-shaped base metal, and each blade body has a base metal chip. It consists of a cutting edge chip brazed to a seat.

切刃チップは、略方形体状のチップ本体と、チップ本体の頂部前面側に形成された所要のすくい角を有するすくい面と、すくい面下に連接して形成された凹部を備えている。さらに、チップ本体の両側には、所要の横逃げ角を有する両側一対の横逃げ面と、チップ本体の頂部に形成された所要の逃げ角を有する外周逃げ面と、外周逃げ面の先端より後端方向に向けて形成された切屑分割用溝と、外周逃げ面と両側横逃げ面外周端とのなす角部が切欠かれて形成された面取り部とを備えている。
特開２００２−１６１４号公報特開２００４−３５１５７８号公報 The cutting edge chip includes a substantially rectangular chip body, a rake face having a required rake angle formed on the front side of the top of the chip body, and a recess formed to be connected below the rake face. Further, on both sides of the chip body, a pair of lateral flank surfaces having a required lateral clearance angle, an outer peripheral clearance surface having a required clearance angle formed on the top of the chip body, and a rear end of the outer peripheral clearance surface. A chip dividing groove formed in the end direction and a chamfered portion formed by cutting out a corner formed by the outer peripheral flank and the outer peripheral ends of both lateral flank surfaces are provided.
Japanese Patent Laid-Open No. 2002-1614 JP 2004-351578 A

上記背景技術のチップ本体の場合、両側の横逃げ面は所要の逃げ角を有して被切断材の切断面との接触を軽減しているが、逃げ角はせいぜい１°程度であり、大きく取ることは難しく、経時的に横逃げ面が摩耗して、切断面との接触面積が広がっていく。接触面積が大きくなると、切削抵抗の増大や発熱の問題が生じ、切刃チップの摩耗・摩擦熱に起因する亀裂や欠けを生じやすく、丸鋸の寿命を著しく低下させやすいものであった。さらに、それらに起因する切断面の両横逃げ面の接触状態の差により、切れ曲りが発生して、加工精度に悪影響を与えるものであった。 In the case of the chip body of the background art described above, the lateral clearance surfaces on both sides have a required clearance angle to reduce contact with the cut surface of the material to be cut, but the clearance angle is at most about 1 °, which is large. It is difficult to take, and the lateral clearance surface wears with time, and the contact area with the cut surface increases. When the contact area is increased, there is an increase in cutting resistance and a problem of heat generation, which tends to cause cracks and chipping due to wear and frictional heat of the cutting edge tip, and to significantly reduce the life of the circular saw. Furthermore, due to the difference in the contact state between the side flank surfaces of the cut surface caused by them, cutting occurs, which adversely affects the machining accuracy.

この発明は上記背景技術の問題点に鑑みて成されたもので、被削材と横逃げ面との接触を極力少なくしてその摩擦を減少せしめ、切刃チップの欠けや切削抵抗の増加、切断面の荒れなどを効果的に防止し、丸鋸の寿命を大幅に延ばすことも可能な金属切断用丸鋸を提供することを目的とする。 This invention was made in view of the above-mentioned problems of the background art, and reduces the friction by reducing the contact between the work material and the side flank as much as possible, increasing the chip of the cutting edge tip and the cutting resistance, An object of the present invention is to provide a circular saw for metal cutting which can effectively prevent roughening of the cut surface and can greatly extend the life of the circular saw.

この発明は、円板状の台金の外周縁に刃体が所定ピッチ毎に形成され、前記各刃体に各々切刃チップが固着されてなる金属切断用丸鋸であって、前記各切刃チップの外周逃げ面両側につながる両側横逃げ面に、前記刃体の回転方向後方に形成され、前記両側横逃げ面間の間隔が狭くなって形成された段部が各々設けられている金属切断用丸鋸である。 The present invention is a metal cutting circular saw in which blades are formed at predetermined pitches on the outer peripheral edge of a disk-shaped base metal, and a cutting edge tip is fixed to each of the blades. Metals provided on both side flank surfaces connected to both sides of the outer peripheral flank surface of the blade tip, respectively, are formed on the rear side in the rotation direction of the blade body, and are formed with a narrower interval between the side flank surfaces on both sides. A circular saw for cutting.

前記段部は、前記刃体の半径方向に対して±１０°の範囲内で段が形成され、前記切刃チップの刃先から前記刃体の円周方向に前記段部までの幅は、０．３〜１．５ｍｍである。また、前記段部から後方部分の前記切刃チップの厚みは、前記刃体の厚みと等しいものである。 The step portion is formed within a range of ± 10 ° with respect to the radial direction of the blade body, and the width from the cutting edge of the cutting blade tip to the step portion in the circumferential direction of the blade body is 0. .3 to 1.5 mm. Further, the thickness of the cutting edge tip in the rear portion from the stepped portion is equal to the thickness of the blade body.

この発明の金属切断用丸鋸は、被削材と横逃げ面との接触を少なくしてその摩擦を減少せしめ、切刃チップの切削抵抗を抑え、切刃チップ及び丸鋸の寿命を大幅に延ばすことが可能なものである。 The circular saw for metal cutting of the present invention reduces the friction by reducing the contact between the work material and the side flank, suppresses the cutting resistance of the cutting edge tip, and greatly increases the life of the cutting edge tip and the circular saw. It can be extended.

以下、この発明の一実施形態について図１，図２を基にして説明する。この実施形態の金属切断用丸鋸１０は、円板状の台金１２の外周に所定ピッチで形成された刃体１４を有し、各刃体１４にはほぼ直角に切り欠かれたチップ座１６が設けられ、このチップ座１６にロウ付け等により超硬金属から成る切刃チップ２０が固定されている。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. A circular saw 10 for cutting metal according to this embodiment has blade bodies 14 formed at a predetermined pitch on the outer periphery of a disk-shaped base metal 12, and each blade body 14 has a chip seat cut out at a substantially right angle. 16 is provided, and a cutting edge tip 20 made of a hard metal is fixed to the tip seat 16 by brazing or the like.

切刃チップ２０は、略方形体状のチップ本体２２と、チップ本体２２の頂部前面側に形成された所要のすくい角を有するすくい面２４と、すくい面２４の下に連接して形成され湾曲した凹部２６を備えている。さらに、チップ本体２２の両側には、すくい面２４及び凹部２６の両側に接続して、刃体１４の両側面と平行な面から僅かに台金１２の半径方向に互いに近づく方向に傾斜した横逃げ面２８が設けられている。横逃げ面２８は、刃体１４の円周方向に、途中で段になり、互いに刃体１４と同じ幅になった段部３０を有している。図２に示すように、段部３０の幅Ａは、切刃チップ２０の刃先から刃体１４の円周方向に、０．３〜１．５ｍｍの範囲が好ましい。これより狭いと、切刃チップ２０の欠けが発生しやすくなり、これより大きいと、段部３０を形成した効果が得られないからである。切刃チップ２０の両側横逃げ面２８両側に形成された段部３０は、チップ本体２２の外周から刃体１４の半径方向に対して、±１０°の範囲内で形成されている。 The cutting edge tip 20 is formed by being connected to a substantially rectangular chip body 22, a rake face 24 having a required rake angle formed on the front side of the top of the chip body 22, and connected to the bottom of the rake face 24. The concave portion 26 is provided. Further, on both sides of the chip body 22, connecting to both sides of the rake face 24 and the recess 26, laterally inclined in a direction slightly approaching each other in the radial direction of the base metal 12 from a plane parallel to both side faces of the blade body 14. A flank 28 is provided. The lateral flank 28 has step portions 30 that are stepped in the middle in the circumferential direction of the blade body 14 and have the same width as the blade body 14. As shown in FIG. 2, the width A of the stepped portion 30 is preferably in the range of 0.3 to 1.5 mm in the circumferential direction of the blade body 14 from the cutting edge of the cutting edge tip 20. If it is narrower than this, chipping of the cutting edge tip 20 tends to occur, and if it is larger than this, the effect of forming the stepped portion 30 cannot be obtained. The step portions 30 formed on both sides of both side clearance surfaces 28 of the cutting edge tip 20 are formed within a range of ± 10 ° from the outer periphery of the tip body 22 to the radial direction of the blade body 14.

さらに、チップ本体２２の頂部に形成された所要の逃げ角を有する外周逃げ面３２と、外周逃げ面３２の先端より後端方向に向けて形成された切屑分割用溝３４と、外周逃げ面３２と両側横逃げ面２８の外周端とのなす角部が切除されて形成された面取り部３６とを備えている。 Furthermore, an outer peripheral flank 32 having a required clearance angle formed at the top of the chip body 22, a chip dividing groove 34 formed from the front end of the outer peripheral flank 32 toward the rear end, and the outer peripheral flank 32. And a chamfered portion 36 formed by cutting off a corner formed by the outer peripheral ends of both lateral relief surfaces 28.

この金属切断用丸鋸１０の使用方法は、所要の切断機にセットして、常法により高速回転させることにより、鉄鋼材など所要の被削材を切削して切断する。 The method of using the metal cutting circular saw 10 is set in a required cutting machine and rotated at a high speed by a conventional method to cut and cut a required work material such as a steel material.

この実施形態の切刃チップ２０を取り付けた金属切断用丸鋸１０は、チップ本体２２の一対の横逃げ面２８の回転方向後方に段部３０が形成されているので、切断時に被削材の切断面に当接する部分は、すくい面２４と横逃げ面２８の一定範囲に抑えられ、横逃げ面２８と被削材との摩擦を、ほぼ図２(ｂ)の斜線部程度の最小限に抑えることができる。これにより、切断時の摩擦による切断抵抗を抑えることができ、発熱も抑えられる。さらにその結果、切刃チップ２０のすくい面２４等の熱クラックの発生を抑えることができ、熱クラックによるチップ本体２２の欠けの発生も防止することができる。また、切断面精度の向上、切断抵抗の軽減により切れ曲りの発生を有効に防止せしめ、金属切断用丸鋸１０の寿命を著しく延ばすことが出来るものである。また、この構造により、切刃チップ２０の再研磨による切刃の再生が容易であり、金属切断用丸鋸１０の寿命も長くすることができる。 The metal cutting circular saw 10 to which the cutting edge tip 20 of this embodiment is attached has a stepped portion 30 on the rear side in the rotational direction of the pair of side clearance surfaces 28 of the tip body 22, so that the work material is cut during cutting. The portion in contact with the cut surface is limited to a certain range between the rake face 24 and the side flank face 28, and the friction between the side flank face 28 and the work material is minimized to the minimum of the shaded area in FIG. Can be suppressed. Thereby, cutting resistance due to friction during cutting can be suppressed, and heat generation can also be suppressed. As a result, it is possible to suppress the occurrence of thermal cracks on the rake face 24 and the like of the cutting edge tip 20, and to prevent the chip body 22 from being chipped due to thermal cracks. In addition, it is possible to effectively prevent the occurrence of cutting by improving the cutting surface accuracy and reducing the cutting resistance, and to significantly extend the life of the circular saw 10 for metal cutting. Further, with this structure, it is easy to regenerate the cutting edge by regrinding the cutting edge tip 20, and the life of the metal cutting circular saw 10 can be extended.

なお、この発明の金属切断用丸鋸は、上記実施形態に限定されるものではなく、段部の高さや後方面の幅等は適宜選択可能なものである。また、切刃チップのその他の構成は適宜設定可能なものである。 In addition, the circular saw for metal cutting of this invention is not limited to the said embodiment, The height of a step part, the width | variety of a rear surface, etc. can be selected suitably. Further, other configurations of the cutting edge tip can be set as appropriate.

この発明の一実施形態の金属切断用丸鋸の刃体の部分拡大正面図（ａ）と、部分拡大上面図（ｂ）である。They are the partial enlarged front view (a) of the blade body of the circular saw for metal cutting of one Embodiment of this invention, and a partial enlarged top view (b). この実施形態の金属切断用丸鋸の切刃チップの平面図（ａ）、正面図（ｂ）、右側面図（ｃ）である。It is a top view (a), a front view (b), and a right side view (c) of the cutting edge tip of the circular saw for metal cutting of this embodiment.

符号の説明Explanation of symbols

１０金属切断用丸鋸
１２台金
１４刃体
１６チップ座
２０切刃チップ
２２チップ本体
２４すくい面
２８横逃げ面
３０段部
３２外周逃げ面 DESCRIPTION OF SYMBOLS 10 Metal saw circular saw 12 Base metal 14 Blade body 16 Tip seat 20 Cutting blade tip 22 Tip body 24 Rake face 28 Side relief face 30 Step part 32 Outer circumference relief face

Claims

円板状の台金の外周縁に刃体が所定ピッチ毎に形成され、前記各刃体に各々切刃チップが固着されてなる金属切断用丸鋸において、
前記各切刃チップの外周逃げ面両側につながる両側横逃げ面に、前記刃体の回転方向後方に形成され、前記両側横逃げ面間の間隔が狭くなって形成された段部が各々設けられていることを特徴とする金属切断用丸鋸。 In a circular saw for metal cutting in which a blade body is formed at a predetermined pitch on the outer peripheral edge of a disk-shaped base metal, and a cutting blade tip is fixed to each blade body,
Steps are formed on both side flank faces connected to both sides of the outer peripheral flank face of each cutting edge tip, and are formed on the rear side in the rotational direction of the blade body, and are formed with a narrow interval between the both side flank faces. A circular saw for cutting metal.

前記段部は、前記刃体の半径方向に対して±１０°の範囲内で段が形成され、前記切刃チップの刃先から前記刃体の円周方向に前記段部までの幅は、０．３〜１．５ｍｍであることを特徴とする請求項１記載の金属切断用丸鋸。 The step portion is formed within a range of ± 10 ° with respect to the radial direction of the blade body, and the width from the cutting edge of the cutting blade tip to the step portion in the circumferential direction of the blade body is 0. The circular saw for cutting metal according to claim 1, wherein the diameter is 3 to 1.5 mm.

前記段部から後方部分の前記切刃チップの厚みは、前記刃体の厚みと等しいことを特徴とする請求項１記載の金属切断用丸鋸。

The metal cutting circular saw according to claim 1, wherein the thickness of the cutting edge tip from the step portion to the rear portion is equal to the thickness of the blade body.