JP2004181571A

JP2004181571A - Saw blade

Info

Publication number: JP2004181571A
Application number: JP2002351354A
Authority: JP
Inventors: Tomoyuki Hashimoto; 智幸橋本
Original assignee: Amada Co Ltd
Current assignee: Amada Co Ltd
Priority date: 2002-12-03
Filing date: 2002-12-03
Publication date: 2004-07-02

Abstract

<P>PROBLEM TO BE SOLVED: To lengthen the service life of a saw blade by restraining a cutting bend of the saw blade 9, and to improve working efficiency by shortening cutting time in spite of a degree of machinability of a workpiece. <P>SOLUTION: This saw blade 9 has a large number of two kinds of trapezoidal teeth different in a shape of an addendum part. The two kinds of trapezoidal teeth are composed of a first trapezoidal tooth 13 of a bilaterally symmetrical shape and a second trapezoidal tooth 15 being a bilaterally symmetrical shape, having an addendum width narrower than an addendum width of the first trapezoidal tooth 13 and having the tooth height higher than the tooth height of the first trapezoidal tooth 13, and forms a parallel kerf 25 in the cutting direction in the center of an addendum surface 21 in the second trapezoidal tooth 15. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、ワークピースの切断に用いられ、かつ台形歯を多数備えてなる鋸刃に関する。
【０００２】
【従来の技術】
従来より、例えば金属製のワークピースを切断する際には帯鋸盤が広く使用されている。そして、前記帯鋸盤の工具である鋸刃については、近年、様々な研究がなされており、前記ワークピースの切断面をきれいに仕上げたいというニューズに対応して、前記切断面を形成する歯先幅の広い台形歯を多数備えた鋸刃が開発されるに至っている。
【０００３】
即ち、図６に示すように、前記ニューズに対応した鋸刃１は、多数の切断歯グループ３を連続して備えてあって、各切断歯グループ３はそれぞれ歯先部の形状が異なる第１台形歯５と第２台形歯７とからなる。ここで、第１台形歯５及び第２台形歯７はそれぞれ左右（図６（ａ）において上下，図６（ｂ）において紙面に向かって裏表，図６（ｃ）において右左）対称形状であって、第１台形歯５の歯高５Ｈは第２台形歯７の歯高７Ｈはよりも低く、第１台形歯５の歯先幅５Ｂは第２台形歯７の歯先歯幅７Ｂよりも広いものである。
【０００４】
なお、本発明に関連する先行技術として特許文献１に示すものがある。
【０００５】
【特許文献１】
特開２０００−２６３３２７号公報
【０００６】
【発明が解決しようとする課題】
ところで、機械構造用炭素鋼，一般構造用圧延鋼、クロム鋼等の一般被削材からなるワークピースに対して切断加工を行う場合にあっては、前述のようにワークピースの切断面をきれいに仕上げることができるものの、合金工具鋼，ステンレス等の難削材からなるワークピースに対して切断加工を行う場合にあっては、第１台形歯５の歯先幅５Ｂ及び第２台形歯７の歯先幅７Ｂが広いために、ワークピースに対する鋸刃１の食い込み性が悪くなって、切断抵抗が高くなる。そのため、鋸刃１を用いて難削材からなるワークピースに対して切断加工を行うと、鋸刃１の切曲り量が大きくなって、鋸刃寿命が短くなると共に、切削時間が長くなって、作業能率が悪化する。
【０００７】
【課題を解決するための手段】
請求項１に記載の発明にあっては、歯先部の形状が異なる複数種の台形歯を多数備えてなる鋸刃において、
前記複数種の台形歯のうち、左右対称形状であって、最も歯先幅が狭くかつ最も歯高が高い台形歯（最小歯先幅で最大歯高の台形歯）における歯先面中央に、切削方向に対して略平行な切り溝を形成してなることを特徴とする。
【０００８】
ここで、前記台形歯には、台形状の切断歯の他に、台形状の切断歯の右コーナ側又は左コーナ側を面取した切断歯も含まれる。
【０００９】
請求項１に記載の発明特定事項によると、前記最小歯先幅で最大歯高の台形歯における歯先面中央に前記切削方向に対して略平行な前記切り溝を形成したため、前記最小歯先幅で最大歯高の台形歯における歯先とワークピースとの接触部を少なくして、前記鋸刃のワークピースに対する食い込み性を向上させて、切削抵抗を小さくすることができる。
【００１０】
請求項２に記載の発明にあっては、歯先部の形状が異なる２種類の台形歯を多数備えてなる鋸刃において、
前記２種類の台形歯は、
左右対称形状の第１台形歯と、
左右対称形状であって、前記第１台形歯の歯先幅よりも狭い歯先幅を有しかつ前記第１台形歯の歯高よりも高い歯高を有した第２台形歯とからなり、
前記第２台形歯における歯先面中央に、切削方向に対して略平行な切り溝を形成してなることを特徴とする。
【００１１】
ここで、前記台形歯には、台形状の切断歯の他に、台形状の切断歯の右コーナ側又は左コーナ側を面取した切断歯も含まれる。
【００１２】
請求項２に記載の発明特定事項によると、前記第２台形歯における歯先面中央に前記切削方向に対して略平行な切り溝を形成したため、前記第２台形歯における歯先とワークピースとの接触部を少なくして、前記鋸刃のワークピースに対する食い込み性を向上させて、切削抵抗を小さくすることができる。
【００１３】
請求項３に記載の発明にあっては、歯先部の形状が異なる３種類の台形歯を多数備えてなる鋸刃において、
前記３種類の台形歯は、
左右非対称形状であって、左コーナ側を面取した第１台形歯と、
左右非対称形状であって、右コーナ側を面取した第２台形歯と、
左右対称形状であって、前記第１台形歯及び前記第２台形歯の歯先幅よりも狭い歯先幅を有しかつ前記第１台形歯及び前記第２台形歯の歯高よりも高い歯高を有した第３台形歯とからなり、
前記第３台形歯における歯先面中央に、切削方向に対して略平行な切り溝を形成してなることを特徴とする。
【００１４】
請求項３に記載の発明特定事項によると、前記第３台形歯における歯先面中央に前記切削方向に対して略平行な切り溝を形成したため、前記第３台形歯における歯先とワークピースとの接触部を少なくして、前記鋸刃のワークピースに対する食い込み性を向上させて、切削抵抗を小さくすることができる。
【００１５】
請求項４に記載の発明にあっては、請求項３に記載の発明特定事項の他、前記第１台形歯の歯先幅と前記第２台形歯の歯先幅が略同じになると共に、前記第１台形歯の歯高と前記第２台形歯の歯高が略同じになるように構成してなることを特徴とする。
【００１６】
請求項４に記載の発明特定事項によると、請求項３に記載の発明特定事項による作用と同様の作用を奏する。
【００１７】
請求項５に記載の発明にあっては、歯先部の形状が異なる３種類の台形歯を多数備えてなる鋸刃において、
前記３種類の台形歯は、
左右対称形状の第１台形歯と、
左右対称形状であって、前記第１台形歯の歯先幅よりも狭い歯先幅を有しかつ前記第１台形歯の歯高よりも高い歯高を有した第２台形歯と、
左右対称形状であって、前記第２台形歯の歯先幅よりも狭い歯先幅を有しかつ前記第２台形歯の歯高よりも高い歯高を有した第３台形歯とからなり、
前記第３台形歯における歯先面中央に、切削方向に対して略平行な切り溝を形成してなることを特徴とする。
【００１８】
請求項５に記載の発明特定事項によると、前記第３台形歯における歯先面中央に前記切削方向に対して略平行な切り溝を形成したため、前記第３台形歯における歯先とワークピースとの接触部を少なくして、前記鋸刃のワークピースに対する食い込み性を向上させて、切削抵抗を小さくすることができる。
【００１９】
請求項６に記載の発明にあっては、請求項１から請求項５のうちのいずれかの請求項に記載の発明特定事項の他に、前記切り溝の底面は、最も歯高の低い前記台形歯の歯先線よりも背面側に位置するように構成してなることを特徴とする。
【００２０】
請求項６に記載の発明特定事項によると、請求項１から請求項５のうちのいずれかの請求項に記載の発明特定事項による作用の他に、前記切り溝の底面は、最も歯高の低い前記台形歯の歯先線よりも背面側に位置するようにしたため、前記切り溝による切り残しが、前記切削方向からみて後続の前記切り溝の底部に接触することを回避できる。
【００２１】
【発明の実施の形態】
以下、本発明の実施の形態について図面を参照して説明する。
【００２２】
図１（ａ）は、図１（ｂ）を上からみた図であって、図１（ｂ）は、第１の発明の実施の形態に係わる鋸刃の一部分の右側面図であって、図１（ｃ）は、前記鋸刃の断面図である。
【００２３】
図１に示すように、第１の発明の実施の形態に係わる鋸刃９は、多数の切断歯グループ１１を連続して備えてあって、各切断歯グループ１１は、それぞれ、歯先部の形状が異なる第１台形歯１３と第２台形歯１５とからなる。なお、各台形歯１３，１５における歯先部は超硬合金により構成されている。
【００２４】
そして、第１台形歯１３及び第２台形歯１５はそれぞれ左右（図１（ａ）において上下，図１（ｂ）において紙面に向かって裏表，図１（ｃ）において右左）において左右）対称形状であって、第２台形歯１５の右コーナ側１７及び左コーナ側１９は面取してある。また、第２台形歯１５は、第１台形歯１３の歯先幅１３Ｂより狭い歯先幅１５Ｂを有し、かつ第１台形歯１３の歯高１３Ｈよりも高い歯高１５Ｈを有している。
【００２５】
更に、第２台形歯１５における歯先面２１中央には歯先２３から切削方向（図１（ａ）（ｂ））において左方向）に対して平行な切り溝２５が左右対称に形成してあって、この切り溝２５の底面は第１台形歯１３の歯先線１３Ｌよりも背面側（図１（ｂ）において下側）に位置するように構成してある。
【００２６】
従って、第１の発明の実施の形態の発明特定事項によると、第２台形歯１５における歯先面２１中央に前記切削方向に対して略平行な切り溝２５を形成したため、第２台形歯１５における歯先２３とワークピース（図示省略）との接触部を少なくして、鋸刃９のワークピースに対する食い込み性を向上させて、切削抵抗を小さくすることができる。
【００２７】
また、切り溝２５の底面は第２台形歯１５の歯先線１５Ｌよりも背面側に位置するようにしたため、切り溝２５による切り残しが前記切削方向からみて後続の切り溝２５の底部に接触することを回避できる。
【００２８】
以上の如き、第１の発明の実施の形態によれば、第２台形歯１５における歯先２３とワークピースとの接触部を少なくして、鋸刃９のワークピースに対する食い込み性を向上させて、切削抵抗を小さくできるため、２数種の台形歯（第１台形歯１３と第２台形歯１５）によってワークピースの切断面をきれいに仕上げつつ、ワークピースの被削性の高低に拘わらず、鋸刃９の切曲りを抑制して、鋸刃寿命を長くすると共に、切削時間を短くして作業能率を向上させることができる。
【００２９】
また、切り溝２５による切り残しが前記切削方向からみて後続の切り溝２５の底部に接触することを回避できるため、第２台形歯１５における切り溝２５付近の歯欠けを防止すると共に、鋸刃９の直進性を更に向上させることができる。
【００３０】
図２（ａ）は、図２（ｂ）を上からみた図であって、図２（ｂ）は、第２の発明の実施の形態に係わる鋸刃の一部分の右側面図であって、図２（ｃ）は、前記鋸刃の断面図である。
【００３１】
図２に示すように、第２の発明の実施の形態に係わる鋸刃２７は、多数の切断歯グループ２９を連続して備えてあって、各切断歯グループ２９は、それぞれ、歯先部の形状が異なる第１台形歯３１と第２台形歯３３と第３台形歯３５からなる。なお、各台形歯３１，３３，３５における歯先部は超硬合金により構成されている。
【００３２】
そして、第１台形歯３１は、左右（図２（ａ）において上下，図２（ｂ）において紙面に向かって裏表，図２（ｃ）において右左）非対称形状であって、左コーナ側３７を面取してある。第２台形歯３３は、左右非対称形状であって、右コーナ側３９を面取してある。ここで、第１台形歯３１の歯先幅３１Ｂと第２台形歯３３の歯先幅３３Ｂが略同じになると共に、第１台形歯３１の歯高３１Ｈと第２台形歯３３の歯高３３Ｈが略同じになるように構成してある。
【００３３】
また、第３台形歯３５は、左右対称形状であって、右コーナ側４１及び左コーナ側４３を面取してある。ここで、第３台形歯３５は、第１，第２台形歯３１，３３の歯先幅３１Ｂ，３３Ｂよりも狭い歯先幅３５Ｂを有してあって、第１，第２台形歯３１，３３の歯高３１Ｈ，３３Ｈよりも高い歯高３５Ｈを有している。
【００３４】
更に、第３台形歯３５における歯先面４５中央には歯先４７から切削方向（図２（ａ）（ｂ）において左方向）に対して平行な切り溝４９が形成してあって、この切り溝４９の底面は第１，第２台形歯３１，３３の歯先線３１Ｌ，３３Ｌよりも背面側（図２（ｂ）において下側）に位置するように構成してある。
【００３５】
従って、第２の発明の実施の形態の発明特定事項によれば、第３台形歯３５における歯先面４５中央に前記切削方向に対して略平行な切り溝４９を形成したため、第３台形歯３５における歯先４７とワークピース（図示省略）との接触部を少なくして、鋸刃２７のワークピースに対する食い込み性を向上させて、切削抵抗を小さくすることができる。
【００３６】
また、切り溝４９の底面は第１，第２台形歯３１，３３の歯先線３１Ｌ，３３Ｌよりも背面側（図２（ｂ）において下側）に位置するようにしたため、切り溝４９による切り残しが前記切削方向からみて後続の切り溝４９の底部に接触することを回避できる。
【００３７】
以上のごとき、第２の発明の実施の形態によれば、第３台形歯３５における歯先４７とワークピースとの接触部を少なくして、鋸刃２７のワークピースに対する食い込み性を向上させて、切削抵抗を小さくできるため、３数種の台形歯（第１台形歯３１と第２台形歯３３と第３台形歯３５）によってワークピースの切断面をきれいに仕上げつつ、ワークピースの被削性の高低に拘わらず、鋸刃２７の切曲りを抑制して、鋸刃寿命を長くすると共に、切削時間を短くして作業能率を向上させることができる。
【００３８】
また、切り溝４９による切り残しが後続の切り溝４９の底部に接触することを回避できるため、第３台形歯３５における切り溝４９付近の歯欠けを防止すると共に、鋸刃２７の直進性を更に向上させることができる。
【００３９】
図３（ａ）は、図３（ｂ）を上からみた図であって、図３（ｂ）は、第３の発明の実施の形態に係わる鋸刃の一部分の右側面図であって、図３（ｃ）は、前記鋸刃の断面図である。
【００４０】
図３に示すように、第３の発明の実施の形態に係わる鋸刃５１は、多数の切断歯グループ５３を連続して備えてあって、各切断歯グループ５３は、それぞれ、歯先部の形状が異なる第１台形歯５５と第２台形歯５７と第３台形歯５９とからなる。なお、各台形歯５５，５７，５９における歯先部は超硬合金により構成されている。
【００４１】
ここで、第１台形歯５５は、左右（図３（ａ）において上下，図３（ｂ）において紙面に向かって裏表，図３（ｃ）において右左）対称形状であって、歯先幅５５Ｂ及び高歯５５Ｈを有している。
【００４２】
また、第２台形歯５７は、左右対称形状であって、右コーナ側６１及び左コーナ側６３を面取している。第２台形歯５７は、第１台形歯５５の歯先幅５５Ｂよりも狭い歯先幅５７Ｂを有してあって、第１台形歯５５の歯高５５Ｈよりも高い歯高５７Ｈを有している。
【００４３】
更に、第３台形歯５９は、左右対称形状であって、左コーナ側６５及び右コーナ側６７を面取している。第３台形歯５９は、第２台形歯５７の歯先幅５７Ｂよりも狭い歯先幅５９Ｂを有してあって、第２台形歯５７の歯高５７Ｈよりも高い歯高５９Ｈを有している。そして、第３台形歯５９における歯先面６９中央には歯先７１から切削方向（図３（ａ）（ｂ））において左方向）に対して平行な切り溝７３が形成してあって、この切り溝７３の底面は第１，第２台形歯５５，５７の歯先線５５Ｌ，５７Ｌよりも背面側（図３（ｂ）において下側）に位置するように構成してある。
【００４４】
従って、第３の発明の実施の形態の発明特定事項によると、第３台形歯５９における歯先面６９中央に前記切削方向に対して略平行な切り溝７３を形成したため、第３台形歯５９における歯先７１とワークピース（図示省略）との接触部を少なくして、鋸刃５１のワークピースに対する食い込み性を向上させて、切削抵抗を小さくすることができる。
【００４５】
また、切り溝７３の底面は第１，第２台形歯５５，５７の歯先線５５Ｌ，５７Ｌよりも背面側（図３（ｂ）において下側）に位置するようにしたため、切り溝７３による切り残しが後続の切り溝７３の底部に接触することを回避できる。
【００４６】
以上のごとき、第３の発明の実施の形態によれば、第３台形歯５９における歯先７１とワークピースとの接触部を少なくして、鋸刃５１のワークピースに対する食い込み性を向上させて、切削抵抗を小さくできるため、３数種の台形歯（第１台形歯５５と第２台形歯５７と第３台形歯５９）によってワークピースの切断面をきれいに仕上げつつ、ワークピースの被削性の高低に拘わらず、鋸刃５１の切曲りを抑制して、鋸刃寿命を長くすると共に、切削時間を短くして作業能率を向上させることができる。
【００４７】
また、切り溝７３による切り残しが前記切削方向からみて後続の切り溝７３の底部に接触することを回避できるため、第３台形歯５９における切り溝７３付近の歯欠けを防止すると共に、鋸刃５１の直進性を更に向上させることができる。
【００４８】
【実施例】
次に、実施例について簡単に説明する。
【００４９】
図４（ａ）は、発明品及び従来品によりＳＫＤ６１からなるワークピースを切断する場合における切断面積と切削抵抗の関係を示す図であって、図４（ｂ）は、発明品及び従来品によりＳ４５Ｃからなるワークピースを切断する場合における切断面積と切削抵抗の関係を示す図であって、図４（ｃ）は、発明品及び従来品によりＳ４５Ｃからなるワークピースを切断する場合における切断面の面粗さを示す図であって、図５（ａ）は、発明品及び従来品によりＳＫＤ６１からなるワークピースを切断する場合における切断面積と鋸刃の切曲り量の関係を示す図であって、図５（ｂ）は、発明品及び従来品によりＳ４５Ｃからなるワークピースを切断する場合における切断面積と鋸刃の切曲り量の関係を示す図であって、図５（ｃ）は、発明品及び従来品によりＳＫＤ６１からなるワークピースを切断する場合における限界切削率を示す図である。
【００５０】
図４（ａ）（ｂ）に示すように、発明品（第１の発明の実施の形態に係わる鋸刃９）によってＳＫＤ６１からなるワークピース又はＳ４５Ｃからなるワークピースを切断する場合の方が、従来品（従来の鋸刃１）によってＳＫＤ６１からなるワークピース又はＳ４５Ｃからなるワークピースを切断する場合に比較して、切断抵抗を低減できることが確認された。また、図４（ｃ）に示すように、前記発明品によってＳ４５Ｃからなるワークピースを切断する場合においても、前記従来品によるってＳ４５Ｃからなるワークピースを切断する場合と同様に、ワークピースの切断面をきれいに仕上げることが確認された。
【００５１】
更に、図５（ａ）（ｂ）に示すように、前記発明品によってＳＫＤ６１からなるワークピース又はＳ４５Ｃからなるワークピースを切断する場合の方が、前記従来品によってＳＫＤ６１からなるワークピース又はＳ４５Ｃからなるワークピースを切断する場合に比較して、鋸刃の切曲り量を小さくきることが確認された。なお、図５（ａ）（ｂ）中の×は鋸刃の切曲り寿命を示している。また、図５（ｃ）に示すように、前記発明品によりＳＫＤ６１からなるワークピースを切断する場合の方が、前記従来品によりＳＫＤ６１からなるワークピースを切断する場合よりも、限界切削率が向上することが確認された。
【００５２】
【発明の効果】
請求項１に記載の発明によれば、前記最小歯先幅で最大歯高の台形歯における歯先とワークピースとの接触部を少なくして、前記鋸刃のワークピースに対する食い込み性を向上させて、切削抵抗を小さくができるため、前記複数種の台形歯によってワークピースの切断面をきれいに仕上げつつ、ワークピースの被削性の高低に拘わらず、前記鋸刃の切曲りを抑制して、鋸刃寿命を長くすると共に、切削時間を短くして作業能率を向上させることができる。
【００５３】
請求項２に記載の発明によれば、前記第２台形歯における歯先とワークピースとの接触部を少なくして、前記鋸刃のワークピースに対する食い込み性を向上させて、切削抵抗を小さくできるため、前記２数種の台形歯（前記第１台形歯と前記第２台形歯）によってワークピースの切断面をきれいに仕上げつつ、ワークピースの被削性の高低に拘わらず、前記鋸刃の切曲りを抑制して、鋸刃寿命を長くすると共に、切削時間を短くして作業能率を向上させることができる。
【００５４】
請求項３に記載の発明によれば、前記第３台形歯における歯先とワークピースとの接触部を少なくして、前記鋸刃のワークピースに対する食い込み性を向上させて、切削抵抗を小さくできるため、前記３数種の台形歯（前記第１台形歯と前記第２台形歯と前記第３台形歯）によってワークピースの切断面をきれいに仕上げつつ、ワークピースの被削性の高低に拘わらず、前記鋸刃の切曲りを抑制して、鋸刃寿命を長くすると共に、切削時間を短くして作業能率を向上させることができる。
【００５５】
請求項４に記載の発明によれば、請求項３に記載に発明と同様の効果を奏する。
【００５６】
請求項５に記載の発明によれば、前記第３台形歯における歯先とワークピースとの接触部を少なくして、前記鋸刃のワークピースに対する食い込み性を向上させて、切削抵抗を小さくできるため、前記３数種の台形歯（前記第１台形歯と前記第２台形歯と前記第３台形歯）によってワークピースの切断面をきれいに仕上げつつ、ワークピースの被削性の高低に拘わらず、前記鋸刃の切曲りを抑制して、鋸刃寿命を長くすると共に、切削時間を短くして作業能率を向上させることができる。
【００５７】
請求項６に記載の発明によれば、請求項１から請求項５のうちのいずれかの請求項に記載の発明の効果の他に、前記切り溝による切り残しが前記切削方向からみて後続の前記切り溝の底部に接触することを回避できるため、前記切り溝からの歯欠けを防止すると共に、前記鋸刃の直進性を更に向上させることができる。
【図面の簡単な説明】
【図１】図１（ａ）は、図１（ｂ）を上からみた図であって、図１（ｂ）は、第１の発明の実施の形態に係わる鋸刃の一部分の右側面図であって、図１（ｃ）は、前記鋸刃の断面図である。
【図２】図２（ａ）は、図２（ｂ）を上からみた図であって、図２（ｂ）は、第２の発明の実施の形態に係わる鋸刃の一部分の右側面図であって、図２（ｃ）は、前記鋸刃の断面図である。
【図３】図３（ａ）は、図３（ｂ）を上からみた図であって、図３（ｂ）は、第３の発明の実施の形態に係わる鋸刃の一部分の右側面図であって、図３（ｃ）は、前記鋸刃の断面図である。
【図４】図４（ａ）は、発明品及び従来品によりＳＫＤ６１からなるワークピースを切断する場合における切断面積と切削抵抗の関係を示す図であって、図４（ｂ）は、発明品及び従来品によりＳ４５Ｃからなるワークピースを切断する場合における切断面積と切削抵抗の関係を示す図であって、図４（ｃ）は、発明品及び従来品によりＳ４５Ｃからなるワークピースを切断する場合における切断面の面粗さを示す図である。
【図５】図５（ａ）は、発明品及び従来品によりＳＫＤ６１からなるワークピースを切断する場合における切断面積と鋸刃の切曲り量の関係を示す図であって、図５（ｂ）は、発明品及び従来品によりＳ４５Ｃからなるワークピースを切断する場合における切断面積と鋸刃の切曲り量の関係を示す図であって、図５（ｃ）は、発明品及び従来品によりＳＫＤ６１からなるワークピースを切断する場合における限界切削率を示す図である。
【図６】図６（ａ）は、図６（ｂ）を上からみた図であって、図６（ｂ）は、従来の鋸刃の一部分の右側面図であって、図６（ｃ）は、前記鋸刃の断面図である。
【符号の説明】
９鋸刃
１３第１台形歯
１５第２台形歯
２１歯先面中央
２５切り溝
２７鋸刃
３１第１台形歯
３３第２台形歯
３５第３台形歯
４５歯先面中央
４９切り溝
５１鋸刃
５５第１台形歯
５７第２台形歯
５９第３台形歯
６９歯先面中央
７３切り溝[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a saw blade used for cutting a workpiece and having a large number of trapezoidal teeth.
[0002]
[Prior art]
2. Description of the Related Art Band saw machines have been widely used for cutting metal workpieces. In recent years, various studies have been made on the saw blade, which is a tool of the band saw machine, and in response to the news that the cut surface of the workpiece is desired to be finished finely, the width of the tooth tip forming the cut surface is desired. Saw blades having a large number of wide trapezoidal teeth have been developed.
[0003]
That is, as shown in FIG. 6, the saw blade 1 corresponding to the news is provided with a large number of cutting tooth groups 3 in succession, and each cutting tooth group 3 has a first shape having a different tooth tip portion. It comprises a trapezoidal tooth 5 and a second trapezoidal tooth 7. Here, the first trapezoidal tooth 5 and the second trapezoidal tooth 7 are symmetrical in the left and right directions (up and down in FIG. 6A, front and back in FIG. 6B and right and left in FIG. 6C). Thus, the tooth height 5H of the first trapezoidal tooth 5 is lower than the tooth height 7H of the second trapezoidal tooth 7, and the tip width 5B of the first trapezoidal tooth 5 is greater than the tip height 7B of the second trapezoidal tooth 7. It is wide.
[0004]
As a prior art related to the present invention, there is one disclosed in Patent Document 1.
[0005]
[Patent Document 1]
JP 2000-263327 A
[Problems to be solved by the invention]
By the way, when cutting a workpiece made of a general work material such as carbon steel for machine structure, rolled steel for general structure, and chrome steel, as described above, clean the cut surface of the workpiece. Although it can be finished, when cutting a workpiece made of a difficult-to-cut material such as alloy tool steel or stainless steel, the tip width 5B of the first trapezoidal tooth 5 and the second trapezoidal tooth 7 Since the tooth width 7B is wide, the bite of the saw blade 1 into the work piece is deteriorated, and the cutting resistance is increased. Therefore, when cutting is performed on a workpiece made of a difficult-to-cut material using the saw blade 1, the amount of bending of the saw blade 1 is increased, the life of the saw blade is shortened, and the cutting time is increased. , Work efficiency deteriorates.
[0007]
[Means for Solving the Problems]
In the invention according to claim 1, in a saw blade including a plurality of trapezoidal teeth having a plurality of types of tooth tips having different shapes,
Of the plurality of types of trapezoidal teeth, the left and right symmetrical shape, the narrowest tip width and the highest tooth height (the trapezoidal tooth with the minimum tip width and the maximum tooth height) in the center of the tip surface, It is characterized in that a cut groove substantially parallel to the cutting direction is formed.
[0008]
Here, the trapezoidal tooth includes, in addition to the trapezoidal cutting tooth, a cutting tooth obtained by chamfering the right corner side or the left corner side of the trapezoidal cutting tooth.
[0009]
According to the first aspect of the present invention, since the cut groove substantially parallel to the cutting direction is formed at the center of the tip surface of the trapezoidal tooth having the minimum tooth width and the maximum tooth height, the minimum tooth tip is formed. In the trapezoidal tooth having the maximum width and the maximum tooth height, the contact portion between the tooth tip and the workpiece is reduced, so that the bite of the saw blade into the workpiece is improved, and the cutting force can be reduced.
[0010]
According to the invention as set forth in claim 2, in a saw blade provided with a large number of two types of trapezoidal teeth having different tooth tip shapes,
The two types of trapezoidal teeth are
A first trapezoidal tooth having a symmetrical shape,
A second trapezoidal tooth having a symmetrical shape, having a tip width narrower than the tip width of the first trapezoidal tooth, and having a tooth height higher than the tooth height of the first trapezoidal tooth;
A cut groove substantially parallel to the cutting direction is formed at the center of the tip surface of the second trapezoidal tooth.
[0011]
Here, the trapezoidal tooth includes, in addition to the trapezoidal cutting tooth, a cutting tooth obtained by chamfering the right corner side or the left corner side of the trapezoidal cutting tooth.
[0012]
According to the second aspect of the present invention, since a cut groove substantially parallel to the cutting direction is formed at the center of the tip surface of the second trapezoidal tooth, the tip of the second trapezoidal tooth, the workpiece, and , The cutting force can be reduced by improving the bite of the saw blade into the work piece.
[0013]
According to the invention as set forth in claim 3, in a saw blade including a large number of three types of trapezoidal teeth having different tooth tip shapes,
The three types of trapezoidal teeth are
A first trapezoidal tooth having a left-right asymmetric shape and a chamfered left corner side;
A second trapezoidal tooth having a left-right asymmetric shape and a right corner side chamfered;
Teeth having a symmetrical shape, having a tip width smaller than the tip width of the first trapezoidal tooth and the second trapezoidal tooth, and being higher than the tooth height of the first trapezoidal tooth and the second trapezoidal tooth. Consisting of a third trapezoidal tooth with a height,
The third trapezoidal tooth is characterized in that a cut groove substantially parallel to the cutting direction is formed at the center of the tip surface of the third trapezoidal tooth.
[0014]
According to the third aspect of the present invention, since a cutting groove that is substantially parallel to the cutting direction is formed at the center of the tip surface of the third trapezoidal tooth, the tooth tip and the workpiece of the third trapezoidal tooth are formed. , The cutting force can be reduced by improving the bite of the saw blade into the work piece.
[0015]
In the invention according to claim 4, in addition to the matters specified in claim 3, the tip width of the first trapezoidal teeth and the tip width of the second trapezoidal teeth are substantially the same, The tooth height of the first trapezoidal teeth is substantially the same as the tooth height of the second trapezoidal teeth.
[0016]
According to the fourth aspect of the present invention, the same operation as that of the third aspect of the present invention is achieved.
[0017]
In the invention according to claim 5, in a saw blade including a large number of three types of trapezoidal teeth having different tooth tip shapes,
The three types of trapezoidal teeth are
A first trapezoidal tooth having a symmetrical shape,
A second trapezoidal tooth having a symmetrical shape, having a tip width narrower than the tip width of the first trapezoidal tooth, and having a tooth height higher than the tooth height of the first trapezoidal tooth;
A third trapezoidal tooth having a symmetrical shape, having a tip width narrower than the tip width of the second trapezoidal tooth, and having a tooth height higher than the tooth height of the second trapezoidal tooth,
The third trapezoidal tooth is characterized in that a cut groove substantially parallel to the cutting direction is formed at the center of the tip surface of the third trapezoidal tooth.
[0018]
According to the fifth aspect of the present invention, since a cutting groove that is substantially parallel to the cutting direction is formed at the center of the tip surface of the third trapezoidal tooth, the tooth tip and the workpiece of the third trapezoidal tooth are formed. , The cutting force can be reduced by improving the bite of the saw blade into the work piece.
[0019]
In the invention according to claim 6, in addition to the invention specifying items according to any one of claims 1 to 5, the bottom surface of the kerf has the lowest tooth height. It is characterized in that it is configured to be located on the back side of the tip line of the trapezoidal tooth.
[0020]
According to the invention-specifying feature of claim 6, in addition to the action of the invention-specifying feature of any one of claims 1 to 5, the bottom surface of the cut groove has the highest tooth height. Since the trapezoidal tooth is located behind the lower tip line of the trapezoidal tooth, it is possible to prevent the uncut portion of the kerf from coming into contact with the bottom of the subsequent kerf when viewed from the cutting direction.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
FIG. 1A is a top view of FIG. 1B, and FIG. 1B is a right side view of a part of the saw blade according to the first embodiment of the present invention. FIG. 1C is a sectional view of the saw blade.
[0023]
As shown in FIG. 1, the saw blade 9 according to the first embodiment of the present invention includes a large number of cutting tooth groups 11 continuously, and each cutting tooth group 11 has a tooth tip portion. It is composed of first trapezoidal teeth 13 and second trapezoidal teeth 15 having different shapes. The tip of each of the trapezoidal teeth 13 and 15 is made of a cemented carbide.
[0024]
The first trapezoidal teeth 13 and the second trapezoidal teeth 15 are symmetrical in the left and right directions (up and down in FIG. 1 (a), front and back in FIG. 1 (b), right and left in FIG. 1 (c)). The right and left corners 17 and 19 of the second trapezoidal tooth 15 are chamfered. The second trapezoidal teeth 15 have a tip width 15B smaller than the tip width 13B of the first trapezoidal teeth 13, and have a tooth height 15H higher than the tooth height 13H of the first trapezoidal teeth 13. .
[0025]
Further, in the center of the tip surface 21 of the second trapezoidal tooth 15, a cut groove 25 is formed symmetrically from the tip 23 to the cutting direction (left direction in FIGS. 1A and 1B) in the left-right direction. In addition, the bottom surface of the cut groove 25 is configured to be located on the back side (lower side in FIG. 1B) than the tip line 13L of the first trapezoidal tooth 13.
[0026]
Therefore, according to the invention specific matter of the first embodiment of the present invention, since the cut groove 25 substantially parallel to the cutting direction is formed at the center of the tip surface 21 of the second trapezoidal tooth 15, the second trapezoidal tooth 15 In this case, the contact portion between the tooth tip 23 and the workpiece (not shown) can be reduced, the bite of the saw blade 9 into the workpiece can be improved, and the cutting resistance can be reduced.
[0027]
Further, since the bottom surface of the cut groove 25 is located on the back side of the tip line 15L of the second trapezoidal tooth 15, the uncut portion of the cut groove 25 contacts the bottom of the subsequent cut groove 25 when viewed from the cutting direction. Can be avoided.
[0028]
As described above, according to the embodiment of the first invention, the contact portion between the tip 23 and the workpiece of the second trapezoidal tooth 15 is reduced, and the bite of the saw blade 9 into the workpiece is improved. Since the cutting force can be reduced, the cut surface of the workpiece is finely finished by two or more kinds of trapezoidal teeth (the first trapezoidal teeth 13 and the second trapezoidal teeth 15), regardless of the machinability of the workpiece. The bending of the saw blade 9 can be suppressed to prolong the life of the saw blade and shorten the cutting time to improve the work efficiency.
[0029]
Further, since it is possible to prevent the uncut portion of the cut groove 25 from contacting the bottom of the subsequent cut groove 25 when viewed from the cutting direction, it is possible to prevent the second trapezoidal tooth 15 from being chipped in the vicinity of the cut groove 25, and to reduce the saw blade. 9 can further improve the straightness.
[0030]
FIG. 2A is a top view of FIG. 2B, and FIG. 2B is a right side view of a part of a saw blade according to the second embodiment of the present invention. FIG. 2C is a sectional view of the saw blade.
[0031]
As shown in FIG. 2, the saw blade 27 according to the second embodiment of the present invention is provided with a large number of cutting tooth groups 29 continuously, and each cutting tooth group 29 has a tooth tip portion. It comprises first trapezoidal teeth 31, second trapezoidal teeth 33, and third trapezoidal teeth 35 having different shapes. The tip of each of the trapezoidal teeth 31, 33, 35 is made of cemented carbide.
[0032]
The first trapezoidal teeth 31 have an asymmetric shape in the left and right direction (up and down in FIG. 2A, front and back in FIG. 2B and right and left in FIG. 2C), and the left corner side 37 is Chamfered. The second trapezoidal teeth 33 have a left-right asymmetric shape and are chamfered on the right corner side 39. Here, the tip width 31B of the first trapezoidal teeth 31 and the tip width 33B of the second trapezoidal teeth 33 become substantially the same, and the tooth height 31H of the first trapezoidal teeth 31 and the tooth height 33H of the second trapezoidal teeth 33. Are configured to be substantially the same.
[0033]
The third trapezoidal teeth 35 have a symmetrical shape with the right and left corners 41 and 43 being chamfered. Here, the third trapezoidal tooth 35 has a tip width 35B that is smaller than the tip width 31B, 33B of the first and second trapezoidal teeth 31, 33, and the first and second trapezoidal teeth 31, It has a tooth height 35H higher than the 33 tooth heights 31H, 33H.
[0034]
Further, in the center of the tip surface 45 of the third trapezoidal tooth 35, a cutting groove 49 parallel to the cutting direction (left direction in FIGS. 2A and 2B) is formed from the tip 47. The bottom surface of the cut groove 49 is configured to be located on the back side (lower side in FIG. 2B) than the tip lines 31L and 33L of the first and second trapezoidal teeth 31 and 33.
[0035]
Therefore, according to the invention specific matter of the embodiment of the second invention, since the cutting groove 49 substantially parallel to the cutting direction is formed at the center of the tip surface 45 of the third trapezoidal tooth 35, the third trapezoidal tooth is formed. The contact portion between the tooth tip 47 and the workpiece (not shown) at 35 is reduced, so that the bite of the saw blade 27 into the workpiece is improved, and the cutting resistance can be reduced.
[0036]
Further, since the bottom surface of the cut groove 49 is located on the back side (lower side in FIG. 2B) than the tip lines 31L, 33L of the first and second trapezoidal teeth 31, 33, the cut groove 49 is used. The uncut portion can be prevented from contacting the bottom of the subsequent cut groove 49 when viewed from the cutting direction.
[0037]
As described above, according to the embodiment of the second invention, the contact portion between the tip 47 and the workpiece of the third trapezoidal teeth 35 is reduced, and the bite of the saw blade 27 into the workpiece is improved. Since the cutting resistance can be reduced, the machinability of the workpiece is improved while the cut surface of the workpiece is finely finished by three or more types of trapezoidal teeth (the first trapezoidal teeth 31, the second trapezoidal teeth 33, and the third trapezoidal teeth 35). Irrespective of the height of the blade, the bending of the saw blade 27 can be suppressed, the life of the saw blade can be prolonged, and the cutting time can be shortened to improve the work efficiency.
[0038]
Further, since it is possible to prevent the uncut portion of the cut groove 49 from contacting the bottom of the subsequent cut groove 49, it is possible to prevent the third trapezoidal tooth 35 from being chipped in the vicinity of the cut groove 49 and to reduce the straightness of the saw blade 27. It can be further improved.
[0039]
FIG. 3A is a top view of FIG. 3B, and FIG. 3B is a right side view of a part of the saw blade according to the third embodiment of the present invention. FIG. 3C is a sectional view of the saw blade.
[0040]
As shown in FIG. 3, the saw blade 51 according to the third embodiment of the present invention includes a large number of cutting tooth groups 53 continuously, and each cutting tooth group 53 has a tooth tip portion. The first trapezoidal teeth 55, the second trapezoidal teeth 57, and the third trapezoidal teeth 59 having different shapes. The tip of each of the trapezoidal teeth 55, 57, 59 is made of a cemented carbide.
[0041]
Here, the first trapezoidal teeth 55 are symmetrical in the left and right directions (up and down in FIG. 3A, front and back in FIG. 3B and right and left in FIG. 3C), and have a tooth tip width 55B. And high teeth 55H.
[0042]
The second trapezoidal teeth 57 have a symmetrical shape in the left-right direction, and chamfer the right corner side 61 and the left corner side 63. The second trapezoidal teeth 57 have a tip width 57B smaller than the tip width 55B of the first trapezoidal teeth 55, and have a tooth height 57H higher than the tooth height 55H of the first trapezoidal teeth 55. I have.
[0043]
Further, the third trapezoidal teeth 59 have a left-right symmetric shape, and chamfer the left corner side 65 and the right corner side 67. The third trapezoidal teeth 59 have a tip width 59B smaller than the tip width 57B of the second trapezoidal teeth 57, and have a tooth height 59H higher than the tooth height 57H of the second trapezoidal teeth 57. I have. In the center of the tip surface 69 of the third trapezoidal tooth 59, a cutting groove 73 is formed parallel to the cutting direction (left direction in FIGS. 3A and 3B) from the tip 71, The bottom surface of the cut groove 73 is configured to be located on the back side (lower side in FIG. 3B) than the tip lines 55L, 57L of the first and second trapezoidal teeth 55, 57.
[0044]
Therefore, according to the invention specific matter of the third embodiment, since the cutting groove 73 substantially parallel to the cutting direction is formed at the center of the tip surface 69 of the third trapezoidal tooth 59, the third trapezoidal tooth 59 In this case, the contact portion between the tooth tip 71 and the workpiece (not shown) can be reduced, the bite of the saw blade 51 into the workpiece can be improved, and the cutting resistance can be reduced.
[0045]
Further, since the bottom surface of the cut groove 73 is located on the back side (lower side in FIG. 3B) than the tip lines 55L, 57L of the first and second trapezoidal teeth 55, 57, the cut groove 73 is used. The uncut portion can be prevented from contacting the bottom of the subsequent cut groove 73.
[0046]
As described above, according to the third embodiment of the present invention, the contact portion between the tip 71 of the third trapezoidal tooth 59 and the workpiece is reduced, and the bite of the saw blade 51 into the workpiece is improved. Since the cutting resistance can be reduced, the cut surface of the workpiece is finely finished by three or more kinds of trapezoidal teeth (the first trapezoidal tooth 55, the second trapezoidal tooth 57, and the third trapezoidal tooth 59), and the workability of the workpiece is improved. Irrespective of the height, the bending of the saw blade 51 can be suppressed, the life of the saw blade can be extended, and the cutting time can be shortened to improve the work efficiency.
[0047]
In addition, since it is possible to prevent the uncut portion of the cut groove 73 from coming into contact with the bottom of the subsequent cut groove 73 when viewed from the cutting direction, the third trapezoidal tooth 59 is prevented from being chipped near the cut groove 73, and the saw blade is cut. The straightness of 51 can be further improved.
[0048]
【Example】
Next, embodiments will be briefly described.
[0049]
FIG. 4A is a diagram showing a relationship between a cutting area and a cutting resistance when a workpiece made of SKD61 is cut by an invention product and a conventional product, and FIG. FIG. 4C is a diagram showing a relationship between a cutting area and a cutting resistance when a workpiece made of S45C is cut, and FIG. 4C illustrates a cut surface when cutting a workpiece made of S45C by an invention product and a conventional product. FIG. 5A is a diagram illustrating surface roughness, and FIG. 5A is a diagram illustrating a relationship between a cutting area and a bending amount of a saw blade when a workpiece made of SKD61 is cut by an invention product and a conventional product. FIG. 5B is a diagram showing the relationship between the cutting area and the amount of bending of the saw blade when cutting a workpiece made of S45C using the invention product and the conventional product, and FIG. Goods Is a diagram illustrating the critical cutting rate in the case of cutting a workpiece made of SKD61 by beauty conventional products.
[0050]
As shown in FIGS. 4 (a) and 4 (b), in the case where a workpiece made of SKD61 or a workpiece made of S45C is cut by the invention (the saw blade 9 according to the first embodiment of the invention), It has been confirmed that the cutting resistance can be reduced as compared with the case where a workpiece made of SKD61 or a workpiece made of S45C is cut by a conventional product (conventional saw blade 1). Also, as shown in FIG. 4 (c), when the workpiece made of S45C is cut by the invention, the work piece is cut in the same manner as when the workpiece made of S45C is cut by the conventional product. It was confirmed that the cut surface was finished finely.
[0051]
Further, as shown in FIGS. 5 (a) and 5 (b), when the work piece made of SKD61 or the work piece made of S45C is cut by the invention product, the work piece made of SKD61 or the work piece made of S45C is cut by the conventional product. It has been confirmed that the cutting amount of the saw blade can be reduced as compared with the case of cutting a workpiece. In addition, x in FIGS. 5A and 5B indicates the bending life of the saw blade. Further, as shown in FIG. 5 (c), when the workpiece made of SKD61 is cut by the invention, the critical cutting rate is improved as compared with the case of cutting the workpiece made of SKD61 by the conventional product. It was confirmed that.
[0052]
【The invention's effect】
According to the first aspect of the present invention, the contact portion between the tip and the workpiece in the trapezoidal tooth having the minimum tip width and the maximum tooth height is reduced, and the bite of the saw blade into the workpiece is improved. Therefore, since the cutting resistance can be reduced, while the cut surface of the workpiece is finely finished by the plurality of trapezoidal teeth, regardless of the machinability of the workpiece, the cutting of the saw blade is suppressed, The working efficiency can be improved by extending the life of the saw blade and shortening the cutting time.
[0053]
According to the second aspect of the present invention, the contact portion between the tip of the second trapezoidal tooth and the workpiece is reduced, so that the bite of the saw blade into the workpiece is improved, and the cutting resistance can be reduced. Therefore, while the cut surface of the workpiece is finely finished by the two kinds of trapezoidal teeth (the first trapezoidal tooth and the second trapezoidal tooth), the cutting of the saw blade is performed regardless of the machinability of the workpiece. The bending can be suppressed to prolong the life of the saw blade, and the cutting time can be shortened to improve the work efficiency.
[0054]
According to the third aspect of the present invention, the contact portion between the tip and the workpiece of the third trapezoidal tooth is reduced, so that the bite of the saw blade into the workpiece is improved, and the cutting resistance can be reduced. Therefore, while the cut surface of the workpiece is finely finished by the three or more kinds of trapezoidal teeth (the first trapezoidal tooth, the second trapezoidal tooth, and the third trapezoidal tooth), regardless of the machinability of the workpiece. In addition, the bending of the saw blade can be suppressed, the life of the saw blade can be prolonged, and the cutting time can be shortened to improve the work efficiency.
[0055]
According to the invention described in claim 4, the same effect as that of the invention described in claim 3 can be obtained.
[0056]
According to the invention as set forth in claim 5, the contact portion between the tip and the workpiece of the third trapezoidal tooth is reduced, so that the bite of the saw blade into the workpiece is improved, and the cutting resistance can be reduced. Therefore, while the cut surface of the workpiece is finely finished by the three or more kinds of trapezoidal teeth (the first trapezoidal tooth, the second trapezoidal tooth, and the third trapezoidal tooth), regardless of the machinability of the workpiece. In addition, the bending of the saw blade can be suppressed, the life of the saw blade can be prolonged, and the cutting time can be shortened to improve the work efficiency.
[0057]
According to the invention described in claim 6, in addition to the effect of the invention described in any one of claims 1 to 5, in addition to the effect of the invention, the uncut portion by the kerf may be a subsequent portion when viewed from the cutting direction. Since the contact with the bottom of the cut groove can be avoided, the chipping from the cut groove can be prevented, and the straightness of the saw blade can be further improved.
[Brief description of the drawings]
FIG. 1 (a) is a top view of FIG. 1 (b), and FIG. 1 (b) is a right side view of a part of a saw blade according to an embodiment of the first invention. FIG. 1C is a sectional view of the saw blade.
FIG. 2A is a top view of FIG. 2B, and FIG. 2B is a right side view of a part of a saw blade according to the second embodiment of the present invention; FIG. 2C is a sectional view of the saw blade.
3 (a) is a view of FIG. 3 (b) as viewed from above, and FIG. 3 (b) is a right side view of a part of a saw blade according to the third embodiment of the present invention; FIG. 3C is a sectional view of the saw blade.
FIG. 4A is a diagram showing a relationship between a cutting area and a cutting resistance when a workpiece made of SKD61 is cut by an invention product and a conventional product, and FIG. FIG. 4C is a diagram showing a relationship between a cutting area and a cutting resistance when a workpiece made of S45C is cut by a conventional product, and FIG. 4C shows a case where a workpiece made of S45C is cut by an invention product and a conventional product. FIG. 4 is a view showing the surface roughness of a cut surface in FIG.
FIG. 5A is a diagram showing a relationship between a cutting area and a bending amount of a saw blade when a workpiece made of SKD61 is cut by an invention product and a conventional product, and FIG. FIG. 5C is a diagram showing a relationship between a cutting area and a bending amount of a saw blade when a workpiece made of S45C is cut by an invention product and a conventional product, and FIG. It is a figure which shows the limit cutting rate in the case of cutting the workpiece which consists of.
6 (a) is a view of FIG. 6 (b) as viewed from above, and FIG. 6 (b) is a right side view of a part of a conventional saw blade, and FIG. () Is a sectional view of the saw blade.
[Explanation of symbols]
9 Saw blade 13 First trapezoidal tooth 15 Second trapezoidal tooth 21 Tooth surface center 25 Cutting groove 27 Saw blade 31 First trapezoidal tooth 33 Second trapezoidal tooth 35 Third trapezoidal tooth 45 Tooth surface center 49 Cutting groove 51 Saw blade 55 1st trapezoidal tooth 57 2nd trapezoidal tooth 59 3rd trapezoidal tooth 69 Tooth center 73

Claims

In a saw blade provided with a large number of different types of trapezoidal teeth having different tooth tip shapes,
Of the plurality of types of trapezoidal teeth, a symmetrical shape, a cut groove substantially parallel to the cutting direction is formed at the center of the tip surface of the trapezoidal tooth having the narrowest tip width and the highest tooth height. A saw blade characterized by the following.

In a saw blade provided with a large number of two types of trapezoidal teeth having different tooth tip shapes,
The two types of trapezoidal teeth are
A first trapezoidal tooth having a symmetrical shape,
A second trapezoidal tooth having a symmetrical shape, having a tip width narrower than the tip width of the first trapezoidal tooth, and having a tooth height higher than the tooth height of the first trapezoidal tooth;
A saw blade characterized in that a cut groove substantially parallel to a cutting direction is formed at the center of the tip surface of the second trapezoidal tooth.

In a saw blade having a large number of three types of trapezoidal teeth having different tooth tip shapes,
The three types of trapezoidal teeth are
A first trapezoidal tooth having a left-right asymmetric shape and a chamfered left corner side;
A second trapezoidal tooth having a left-right asymmetric shape and a right corner side chamfered;
A third symmetrical shape having a tip width smaller than the tip width of the first and second trapezoidal teeth and having a tooth height higher than the tooth height of the first and second trapezoidal teeth; Consisting of trapezoidal teeth,
A saw blade characterized in that a cutting groove substantially parallel to a cutting direction is formed at the center of the tip surface of the third trapezoidal tooth.

The tip width of the first trapezoidal tooth is substantially equal to the tip width of the second trapezoidal tooth, and the tooth height of the first trapezoidal tooth is substantially equal to the tooth height of the second trapezoidal tooth. The saw blade according to claim 3, wherein the saw blade is configured.

In a saw blade having a large number of three types of trapezoidal teeth having different tooth tip shapes,
The three types of trapezoidal teeth are
A first trapezoidal tooth having a symmetrical shape,
A second trapezoidal tooth having a symmetrical shape, having a tip width narrower than the tip width of the first trapezoidal tooth, and having a tooth height higher than the tooth height of the first trapezoidal tooth;
A third trapezoidal tooth having a symmetrical shape, having a tip width narrower than the tip width of the second trapezoidal tooth, and having a tooth height higher than the tooth height of the second trapezoidal tooth,
A saw blade characterized in that a cutting groove substantially parallel to a cutting direction is formed at the center of the tip surface of the third trapezoidal tooth.

The bottom surface of the said cut groove is comprised so that it may be located behind the tooth tip line of the said trapezoidal tooth with the lowest tooth height, The one in any one of Claim 1 to 5 characterized by the above-mentioned. The described saw blade.