JP4110544B2

JP4110544B2 - Manufacturing method of saw blade of hand saw

Info

Publication number: JP4110544B2
Application number: JP29108397A
Authority: JP
Inventors: 英二只信
Original assignee: ARS Corp
Current assignee: ARS Corp
Priority date: 1997-10-23
Filing date: 1997-10-23
Publication date: 2008-07-02
Anticipated expiration: 2017-10-23
Also published as: JPH11123704A

Description

【０００１】
【発明の属する技術分野】
本発明は手引き鋸の鋸身の製造方法に関するものである。
【０００２】
【従来の技術】
従来より手引き鋸により被切断材を切断する場合において、鋸身と被切断材との摩擦を低減し、鋸引きを軽快にするために、鋸身に対し鋸歯の先端を一目毎交互に左右に振り分けて、鋸歯部のアサリ厚み巾を背部の厚みより広くする、アサリ付けが施されており、このアサリの最適な形成度合は被切断材の種類により相違するが、通常は鋸身の厚さの１．３〜１．８倍が適当とされている。
【０００３】
更に、鋸身の側面と被切断材との摩擦を一層低減するため、鋸歯部の付け根から腹部にかけての鋸身の厚みを薄くし、鋸引きの際に腹部と被切断材とが接触しないようにして摩擦を低減した鋸として、鋸身本体の刃渡り全長、もしくは根元側後半部における背部の厚みを、鋸歯を形成した鋸歯部先端のなす厚みと同一ないし稍小となるように定め、さらにこの背部と鋸歯部との間における腹部の厚みを、本体両側面に盗み部を設けることにより上記背部の厚みより小さくなるように形成させ、然して上記鋸歯の末端と盗み部を設けた腹部の外面を連続状に形成したことを特徴とする手引き鋸が特開昭５７ー１５９０２号公報等により知られている。
【０００４】
【発明が解決しようとする課題】
上記従来の手引き鋸の製造は、図８に示すように、アサリ厚み巾（２ｔ）の厚みを有する鋼板部材を砥石等による研磨手段を用いて、背部はアサリ厚み巾（２ｔ）より狭く背厚（７ｔ）となるように、且つ腹部は最も薄い腹厚（８ｔ）からアサリ厚み巾（２ｔ）に漸増するよう左右側面を対称に研磨し、最後に鋸歯の目立てを行って鋸身を製造するものであり、研磨によりアサリ厚み巾（２ｔ）を背巾（７ｔ）より巾広く残すことでアサリ付けを不要としている。
【０００５】
しかし、背部、腹部及び鋸歯部の全面を研磨手段により削り出すため、材料の鋼板部材は少なくともアサリ厚み巾（２ｔ）の厚みを有した厚い鋼板部材を使用する必要があり、材料コストの削減が困難である一方、背部や腹部においては、厚い鋼板部材を背厚（７ｔ）や腹厚（８ｔ）まで研磨するため、材料の研磨量が非常に多くなり、材料の大部分が無駄になるとともに、鋼板部材の粗研磨と仕上げ研磨の二段階の研磨加工が必要で、加工に手数が掛かり、加工時間も長時間を要する。又、研磨加工に使用する砥石の摩耗も激しく、その交換等にも手数が掛るなど製造コストが高くなり、経済性に問題があった。
【０００６】
更に、研磨量の多さと共に研磨加工精度の限界により、一定の厚みであるべき背厚（７ｔ）、腹厚（８ｔ）が鋸身の部位によって異なる場合があるだけでなく、研磨工程において鋸基体にねじれが生じたまま研磨した場合には、鋸身に歪みを残してしまう虞があり、被切断材を切断した場合における切断面の仕上がりの悪化や、被切断材との摩擦により鋸引き操作が重くなる等の問題が生じていた。
【０００７】
そこで本発明は、圧延により形成及び表面仕上げされた圧延鋼板は寸法、面粗度の精度が確保されている点に着眼し、鋸身の材料に薄い圧延鋼板を使用できるようにすることで材料コストを低減するとともに、研磨工程における研磨量を減少させ、製造工程の手数も削減して製造コストを低減することにより、鋸身の厚さが均一で、且つ歪みがない鋸身である手引き鋸を安価に製造できる製造方法を提供することを課題とする。
【０００８】
【課題を解決するための手段】
本発明は上記課題を解決するためになされたものであって、鋸身の両側面に対する研磨手段に回転砥石を使用し、該回転砥石の回転軸を鋸身の移送ラインに対して鋭角に設定し研磨を行う手引き鋸の製造方法において、圧延鋼板（Ｍ）を鋸身（１）の外形輪郭形状に打ち抜いて打抜第一基体（１ａ）とし、該打抜第一基体（１ａ）の鋸歯を形成する縁部に、後工程において目立形成する鋸歯に対応させた鋸歯形成部（２ｃ）を形成するとともにアサリ付けを施してアサリ付第一基体（１ｂ）とする第一工程と、該アサリ付第一基体（１ｂ）を固定して移送する移送手段と、スピンドル（１２）によって前記回転砥石（１１）を回転させる研磨手段からなり、前記研磨手段により、回転砥石（１１）の周面又はその一部を、アサリ付第一基体（１ｂ）を背部（７）とこれに連続する腹部形成部とに仮想ラインで分けたその腹部形成面に接しさせて、砥石周面縁部（１１ｃ）が背部（７）と腹部（８）の境界部に隅肉部（７ａ）を形成し、アサリを確保した状態において、前記アサリ付第一基体（１ｂ）の両側面の腹部形成部のみを片面毎に又は両面同時に研磨し、盗み部（９）を形成して腹部（８）とするとともにアサリを揃え、前記鋸歯形成部（２ｃ）のアサリ厚み巾（２ｔ）を背部（７）の背厚（７ｔ）より大として研磨第二基体（１ｃ）を形成する第二工程と、前記鋸歯形成部（２ｃ）に目立手段により、第一鋸歯（２ａ）若しくは第二鋸歯（２ｂ）又はこれらを混在させた鋸歯部（２）を形成して鋸身（１）とする第三工程とからなる手引き鋸の製造方法を基本とする。
【０００９】
【発明の実施の形態】
及び
【実施例】
（実施例１）
本発明の実施例１に係る折り畳み式手引き鋸の鋸身の製造方法を図を用いて説明すると、図１は鋸身の製造工程の手順、図２は鋸身の模式的断面図、図３はアサリ付第一基体を片面研磨している状態の正面図、図４は図３のＨ方向から見た側面図であって、まず、第一工程として厚さ０．８ｍｍの圧延鋼板Ｍを全長３００ｍｍ、最大高さ４０ｍｍの鋸身１の外形輪郭形状にプレスカッターにより打ち抜いて打抜第一基体１ａとし、その腹部８の縁部に鋸歯部２の基礎となる鋸歯形成部２ｃをプレス手段により形成し、同時に該鋸歯形成部２ｃを一目毎に圧延鋼板Ｍに対して左右に振り分けるように交互に曲げてアサリ付けを施してアサリ付第一基体１ｂを得る。該アサリは右側面側に曲げた鋸歯形成部２ｃの先端を結ぶ仮想線と、左側面側に曲げた鋸歯形成部２ｃの先端を結ぶ仮想線が為す間隔、すなわちアサリ厚み巾２ｔが圧延鋼板Ｍの厚さよりやや広く、１．２ｍｍとなるようにする。
【００１０】
次に第二工程として上記アサリ付第一基体１ｂの側面であって鋸歯形成部２ｃの先端部から２０ｍｍの位置を基線Ｌ１とし、鋸歯形成部２ｃの先端部から基線Ｌ１までの両側面を、鋸歯形成部２ｃと連続するように研磨し、腹部８を形成して研磨第二基体１ｃを形成する。すなわち、手引き鋸の把手を支持するため根元側後端を研磨せずに支持面１３を残し、アサリ付第一基体１ｂの前端から根元側後端付近までほぼ全長に渡って左右対称に、且つアサリ厚み巾２ｔを背部７の背厚７ｔより大とし、アサリを確保するようにして後記研磨手段により研磨する。研磨の形状は腹部８は左右均一に研磨して盗み部９を削除することにより、腹部８の腹厚８ｔが０．６ｍｍで一定となるようにし、鋸歯形成部２ｃの近辺では研磨量を減少させて滑らかに鋸歯形成部２ｃと腹部８を連続させ、先端部分では極僅かに研磨するにとどめて鋸歯形成部２ｃのアサリを揃える。尚、研磨量や研磨部分は完成する鋸身１の曲げやねじりに対する強度に大きく関係するため、研磨量の増減、あるいは支持面１３付近の研磨を減少して鋸身１の強度を調節することができる。
【００１１】
上記第二工程において使用する研磨手段は図３に示すように、アサリ付第一基体１ｂを電磁力を利用して吸着固定するベッド１０と、該ベッド１０を矢印の方向へ移送可能な駆動手段（図示省略）からなる移送手段、及びスピンドル１２によって回転する回転砥石１１からなるものであって、回転砥石１１はアサリ付第一基体１ｂを挟持して研磨するようにベッド１０との間隔を確保して位置決め固定されている。
【００１２】
上記回転砥石１１は、直径１５０ｍｍ，厚さ１２ｍｍの円柱砥石部１１ａに底面の直径１５０ｍｍの截頭円錐形の円錐砥石部１１ｂを連続して形成した形状で、連続部１１ｅは滑らかに連続しており、該円錐砥石部１１ｂの形状はアサリ付第一基体１ｂの腹部８を研磨する場合に円錐砥石周面１１ｆが僅かに鋸歯形成部２ｃの先端部を研磨するように設定されており、該回転砥石１１の回転軸はベッド１０に吸着固定したアサリ付第一基体１ｂの側面に平行であり、且つベッド１０の移送方向と平行な仮想ラインである移送ラインに対する角度θが７０度となるように設定されている。
【００１３】
図４に示すように研磨手段をＨ方向から見ると砥石周面縁部１１ｃの射影は楕円形となり、円柱砥石周面１１ｄはアサリ付第一基体１ｂの側面に平行であり、連続部１１ｅも滑らかな曲線である。
【００１４】
研磨加工する場合には、まずアサリ付第一基体１ｂの鋸歯形成部２ｃをベッド１０の移送ラインと平行になるようにし、且つベッド１０と最も接近する砥石周面縁部１１ｃ上の点が基線Ｌ１の延長線上になるようにしてアサリ付第一基体１ｂを吸着固定した後、前記ベッド１０を移送して前記回転砥石１１を該ベッド１０に固定されたアサリ付第一基体１ｂの側面に当接し、アサリ付第一基体１ｂの側面を研磨して盗み部９を形成し、次に裏面についても同様に研磨して腹厚８ｔを０．６ｍｍの一定厚とし、両面のアサリが綺麗に揃い、アサリ厚み巾２ｔを約１．２ｍｍに確保し、背厚７ｔは背部７を研磨しないため圧延鋼板Ｍの厚みのまま０．８ｍｍとした研磨第二基体１ｃを得る。
【００１５】
上記研磨手段によれば、回転砥石１１の回転軸をベッド１０の移送ラインに対する角度θを７０度として位置決め固定したため、アサリ付第一基体１ｂの鋸歯形成部２ｃをベッド１０の移送方向と平行になるように確実に吸着固定することにより、研磨加工時におけるアサリ付第一基体１ｂの歪みが発生することなく、腹部８に（回転砥石１１の厚さ１２ｍｍ）×ｓｉｎ７０度の巾で正確且つ容易に一定量の研磨を行うことができ、腹部８から背部７への境界部は、盗み部９の厚さを０．２ｍｍとした場合には巾約１．９ｍｍに渡って前記砥石周面縁部１１ｃの射影の形状でもって隅肉部７ａを形成することにより滑らかに連続し、鋸歯形成部２ｃは先端部に向かうに従って研磨量が減少し、該先端部を僅かに研磨して鋸歯形成部２ｃのアサリを揃えることができる。更に、研磨加工における研磨量は僅かな量であるため仕上げ用の砥石を用いた研磨加工のみでよく、加工精度を確保し易いため研磨面を極めて平滑に仕上げることができ、加工時間も短時間で充分であるため研磨による発生熱も僅かであって圧延鋼板Ｍに及ぼす影響も少ない。
【００１６】
尚、研磨手段は上記実施例に限定されるものではなく、回転砥石１１の形状、寸法、回転軸とベッド１０の移送ラインが為す角度θ等は製造する鋸身１の形状、腹部８の巾等に応じて変更できることはいうまでもないが、例えば隅肉部７ａを形成する部分であるため砥石周面縁部１１ｃに面取りを形成し、円錐砥石周面１１ｆの母線を円弧状として角度θを大きくする、あるいは、砥石の形状を截頭円錐形状として回転軸とアサリ付第一基体１ｂがなす角度を任意方向に設定するようにしてもよい。
【００１７】
しかし、回転軸と移送ラインのなす角度θを余り大きく（約８０度以上）すると隅肉部７ａが小さくなってしまうとともに、腹部８の表面に回転砥石１１による筋目が鋸身１の長手方向と略平行に、やや荒目に形成されるため、鋸歯の曲げ方向に対する強度を確保する上で好ましくない。反対に角度θを小さく（約６０度以下）すると、隅肉部７ａの巾が広くなることで、背部７と腹部８の厚さの差が少なくなるため、鋸引き作業において被切断材との摩擦が増大して鋸引き操作が重くなるとともに、回転砥石１１の厚みに対して腹部８の巾が狭くなるため効率的な研磨が行えず、一度の研磨で腹部８、隅肉部７ａ及びアサリを揃えるためには厚い回転砥石１１を使用する必要が生じる。そこで移送ラインに対する回転砥石１１の回転軸がなす角度を約６０度から８０度の範囲で設定すると、腹部８表面に形成される筋目は十分細かくなり、鋸歯の曲げ方向に対する強度を確保できるとともに隅肉部７ａの巾を適度なものとなり、効率的な研磨も行えることとなるため、好ましい。
【００１８】
尚、上記第二工程においては、片面ずつ研磨を行ったが、両面同時に、又は連続的に行うことも可能であって、まず両面同時の研磨手段の例について説明すると、アサリ付第一基体１ｂの支持面１３をクランプ等を用いて咬持固定するとともに該アサリ付第一基体１ｂを移送する移送手段、及び上記第二工程で使用した研磨手段のうちスピンドル１２によって回転する回転砥石１１の一対から構成し、該移送手段により移送されるアサリ付第一基体１ｂの腹部形成部を挟持するように、一対の回転砥石１１を回転砥石周面１１ｄが間隙を確保するよう対向して設置すると同時に、回転砥石１１の回転軸と移送ラインがなす角度を６０度から８０度程度に設定し、各回転砥石１１の回転方向をアサリ付第一基体１ｂの移送方向として、移送されるアサリ付第一基体１ｂを前記間隙に回転砥石１１の周速度よりも遅い移送速度で挿入することにより、腹部８、隅肉部７ａ及びアサリの両面を同時に研磨加工するのである。
【００１９】
次に連続研磨手段の例について説明すると、回転砥石１１を取り付けたスピンドル１２とベッド１０とからなる研磨装置の一対及びアサリ付第一基体１ｂをクランプ等を用いて咬持して移送する移送手段から構成し、ベッド１０はアサリ付第一基体１ｂの両面に当接するように、該アサリ付第一基体１ｂの表裏に、移送方向に平行に連続して配置し、該アサリ付第一基体１ｂを挟持するようにベッド１０と対向して固定する前記各回転砥石１１は前記各スピンドル１２によって回転させるとともに、アサリ付第一基体１ｂの両面を対称に研磨できるように位置させ、該回転砥石１１の回転軸はベッド１０に平行で、且つアサリ付第一基体１ｂの移送方向に対する角度が６０度から８０度となるように設定することにより、移送されるアサリ付第一基体の腹部８、隅肉部７ａ及びアサリを連続的に研磨加工するのである。
【００２０】
上記の例による研磨手段によれば、片面毎に研磨する研磨手段と比較してアサリ付第一基体１ｂを裏返してベッド１０に固定する手数が削減できるため、一定寸法の腹部８と背部７を有する鋸身１を効率よく製造することができ、さらに両面同時研磨手段によればベッド１０にアサリ付第一基体１ｂを固定することなく、歪みのない研磨を両面同時に迅速に行うことができる。
【００２１】
最後に第三工程として鋸歯部２を既存の目立て形成手段により形成して鋸身１を完成させる。鋸歯部２の形状について詳細に説明すると、図５のように、該鋸歯部２は第一鋸歯２ａ及び第二鋸歯２ｂから構成されており、各第一鋸歯２ａにはＡ断面に示すように、アサリ付けにより曲げられた方向と反対の面（以下「アサリ内面」という）の鋸引き方向ｊ側に下刃３、鋸送り方向ｋ側に上刃４、さらに先端部に上刃４、下刃と交わるように上目５が形成され、該下刃３と該上目５とが交わる先端部が第一天６ａを形成している。すなわち、第一鋸歯２ａはそれぞれ下刃３等が形成された面（以下「歯表」という）とは反対面（以下「歯裏」という）の方向にアサリが形成されることとなり、各第一天６ａが鋸歯部２の最も広い部分、すなわちアサリ厚み巾２ｔを構成している。
【００２２】
次に第二鋸歯２ｂには、Ｂ断面に示すように、鋸引き方向ｊ側に下刃３が形成されておらず、アサリ付けにより曲げられた方向の面（以下「アサリ外面」という）の鋸送り方向ｋ側に上刃４、先端部に上目５がそれぞれ形成されており、上目５の先端部が第二天６ｂを形成している。従って第二鋸歯２ｂは上刃４等が形成されている面、すなわち歯表の方向に曲げられてアサリが形成されることとなるが、各第二天６ｂの左右への開き巾は前記第一天６ａの開き巾よりも狭くしている。
【００２３】
また、第一鋸歯２ａ、第二鋸歯２ｂの配列であるが、四目の第一鋸歯２ａの歯表と歯裏が順次交互に鋸身１の左右を向くように配列されており、第二鋸歯２ｂは第一鋸歯２ａの四目ごとに一目形成されており、該第二鋸歯２ｂも歯表と歯裏が順次交互に左右を向くように配列されている。
【００２４】
また、鋸身１をＣ方向からみると、第一天６ａと第二天６ｂが重なり合わず、アサリ厚み巾２ｔの巾方向に第一天６ａと第二天６ｂが四つ並んだ状態、つまり、両端に左右二つの第一天６ａがあり、その間に二つの第二天６ｂが位置し、第一天６ａと第二天６ｂが巾方向に四つ並ぶ構成となる。
【００２５】
従って、第一天６ａが左右に二つだけの場合であれば、被切断材の引き目の底面中央に断面三角形状の山が残り、この山が切削作業の妨げになって、鋸引きが重く、切れ味が悪くなるのであるが、第一天６ａと第二天６ｂが四つ並ぶようにしたことにより、引き目の底面中央に断面三角形状の山は残らず、切削作業において操作が軽くなり、切れ味が良くなるのである。
【００２６】
以上説明した実施例１の横引き用鋸によれば、材料となる圧延鋼板Ｍの厚みは背厚７ｔの厚みを有しておればよく、薄い圧延鋼板Ｍを使用できるため材料コストを低減することができ、研磨して仕上げる部分が鋸身１の腹部８と鋸歯形成２ｃの一部だけであるため、従来の鋸身１全体を研磨で形成する製造方法と比較して材料の研磨量が非常に少なくなり、材料の無駄が削減できるとともに、研磨方法が簡単且つ鋸身１に歪みの出ない研磨ができるので製作手数がかからず製造工程の手数も削減して、製造コストを低減することができ経済性を向上させることができる。
【００２７】
また、背厚７ｔが腹厚８ｔと比較して厚くすることができるため、鋸身１の腰が強く、腹厚８ｔを十分薄くしても鋸身１の捩じれが少なくなり、曲げに対する強度を確保できる。さらに回転砥石１１の回転軸をアサリ付第一基体１ｂの移送ラインに対して鋭角をなすように設定して研磨するため、背部７と腹部８の境界部に連続的に隅肉部７ａを形成でき、鋸身１の曲げに対する耐久性が向上するとともに、研磨により鋸歯部２に形成される筋目が十分細かくなって、鋸歯部２の周辺に発生する応力集中を防止し、曲げ方向に対する強度を確保して鋸歯の欠損を減少することができ、さらに、歯先が揃った綺麗なアサリが得られ、鋸引きにおいて被切断材の引き目を綺麗に仕上げることができるとともに、被切断材との摩擦による抵抗が少なく、鋸引きが軽快となる。
【００２８】
更に、圧延鋼板Ｍを鋸身１の外形輪郭形状に切断してから上記研磨等の加工を施すため、背部７の高さ、鋸身１の高さ、アサリの形成度合、鋸歯部２の形状を容易に変化させ、部分的に強度の必要な部分は盗み部９を形成しないでおくなど自由な加工が可能であり、これにより手引き鋸の用途に応じた腰の強さや歯の形状を得ることができる。尚、本発明に係る鋸は以上説明した実施例に限定されるものではなく、手引き鋸の用途に合わせた寸法、形状、または素材を使用することができることは言うまでもない。
【００２９】
（実施例２）
本発明の実施例２に係る手引き鋸を図を用いて説明すると、図６は本発明の実施例２に係る折り畳み式手引き鋸の鋸身１を右側面から見た部分拡大図であって、厚さ０．８ｍｍの圧延鋼板Ｍを全長３００ｍｍ、高さ３５ｍｍの鋸身１の外形輪郭形状にプレスカッターにより切断し、鋸歯形成部２ｃをプレスで成形してアサリ付第一基体１ｂを得る第一工程、該アサリ付第一基体１ｂの側面を研磨する第二工程は実施例１と同様であるが、第三工程で形成する鋸歯部２の形状に特徴がある。以下鋸歯部２の形状について詳細に説明する。
【００３０】
図６のように、該鋸歯部２は第一鋸歯２ａ及び第二鋸歯２ｂから構成されており、各第一鋸歯２ａの形状は実施例１と同様であって、アサリ内面の鋸引き方向ｊ側に下刃３、鋸送り方向ｋ側に上刃４、さらに先端部に下刃３、上刃４と交わるように上目５が形成され、該下刃３と該上目５とが交わる先端部が第一天６ａを形成している。すなわち、第一鋸歯２ａはそれぞれ歯裏の方向に曲げられてアサリが形成されることとなり、各第一天６ａが鋸歯部２の最もアサリ厚み巾２ｔの広い部分を構成している。
【００３１】
次に第二鋸歯２ｂには、鋸引き方向ｊ側の下刃３が形成されておらず、鋸送り方向ｋ側において、歯丈中心線Ｌ２に対して左右対称に上刃４が形成され、鋸身１の長手方向に対し、左右対称に上目５が形成されている。そして、上目５は第二天６ｂが尖ったものにせず、水平方向に巾を有しており、この第二鋸歯２ｂは左右どちらにもアサリ付けを行わない。
【００３２】
鋸歯部２をこのように構成したため、鋸身１を右側面からみると、四目の第一鋸歯２ａが歯表と歯裏が順次交互に左右を向くように配列されており、第二鋸歯２ｂは第一鋸歯２ａの四目ごとに一目形成されており、該第二鋸歯２ｂは左右対称であるため、いずれの側からみても同じ形状である。また、鋸身１をＥ方向からみると、第一天６ａの間に第二鋸歯２ｂの水平な第二天６ｂが存在する状態となり、鋸引き操作及び切れ味において、以下のような効果がある。
【００３３】
すなわちＥ方向から見た場合に第一天６ａが左右に二つだけの場合には、被切断材の引き目の底面中央に断面三角形状の山が残り、この山が切削作業の妨げになる。よって鋸引きが重く、切れ味が悪くなる。一方、本実施例のように第一天６ａをつなぐように第二鋸歯２ｂの第二天６ｂを形成した手引き鋸によれば、第二鋸歯２ｂが引き目の底を切削する機能を高めているので、引き目の底面中央に断面三角形状の山は残らず、切削作業において操作が非常に軽くなり、切れ味が良くなるのである。
【００３４】
（実施例３）
本発明の実施例３に係る折り畳み式手引き鋸を図を用いて説明すると、図７は本発明の実施例３に係る手引き鋸の鋸身１を右側面から見た部分拡大図であって、厚さ０．８ｍｍの圧延鋼板Ｍを全長３００ｍｍ、高さ３５ｍｍの鋸身１の外形輪郭形状にプレスカッターにより切断し、鋸歯形成部２ｃをプレスで成形してアサリ付第一基体１ｂを得る第一工程、該アサリ付第一基体１ｂを研磨する第二工程は実施例１と同様であるが、第三工程で形成する鋸歯部２の形状に特徴がある。以下鋸歯部２の形状について詳細に説明する。
【００３５】
図７のように、該鋸歯部２は第一鋸歯２ａ及び第二鋸歯２ｂから構成されており、各第一鋸歯２ａの形状は実施例１と同様であって、アサリ内面の鋸引き方向ｊ側に下刃３、鋸送り方向ｋ側に上刃４、さらに先端部に下刃３、上刃４と交わるように上目５が形成され、該下刃３と該上目５とが交わる先端部が第一天６ａを形成している。すなわち、第一鋸歯２ａはそれぞれ歯裏の方向に曲げられてアサリが形成されることとなり、各第一天６ａが鋸歯部２の最もアサリ厚み巾２ｔの広い部分を構成している。
【００３６】
次に第二鋸歯２ｂには、鋸引き方向ｊ側の下刃３が形成されておらず、鋸送り方向ｋ側において歯丈中心線Ｌ２に対して左右対称に上刃４が形成され、鋸身１の長手方向に対して左右対称に上目５が形成されている。前記実施例２と異なり、上目５は第二天６ｂが尖るように形成しており、この第二鋸歯２ｂは左右どちらにもアサリを有していない。
【００３７】
鋸歯部２をこのように構成したため、四目の第一鋸歯２ａが歯表と歯裏が順次交互に左右を向くように配列され、第二鋸歯２ｂは第一鋸歯２ａの四目ごとに一目形成されており、該第二鋸歯２ｂは左右対称であるため、いずれの側からみても第二鋸歯２ｂについては同じ形状である。よって、鋸身１をＧ方向からみると、第一天６ａの間に第二鋸歯２ｂの第二天６ｂが存在する状態となり、切れ味の上において、以下のような効果がある。
【００３８】
すなわち、Ｇ方向から見て、第一天６ａが左右に二つだけの場合には、被切断材の引き目の底面中央に断面三角形状の山が残り、この山が切削作業の妨げになるから鋸引きが重く、切れ味が悪くなる。一方、本実施例のように第一天６ａの間に第二鋸歯２ｂの第二天６ｂを形成した手引き鋸によれば、第二鋸歯２ｂが引き目の底を切削する機能を高めているので、引き目の底面中央に断面三角形状の山は残らず、切削作業において操作が軽くなり、切れ味が良くなるのである。
【００３９】
【発明の効果】
以上説明した本発明に係る手引き鋸の製造方法によれば、材料となる圧延鋼板（Ｍ）の厚みは背厚（７ｔ）の厚みを有しておればよく、薄い圧延鋼板（Ｍ）を使用できるため材料コストを低減することができ、研磨して仕上げる部分が鋸身（１）の腹部（８）と鋸歯形成（２ｃ）の一部だけであるため、従来の鋸身（１）全体を研磨で形成する製造方法と比較して材料の研磨量が非常に少なくなり、材料の無駄が削減できるとともに、研磨方法が簡単且つ鋸身（１）に歪みの出ない研磨ができるので製作手数がかからず製造工程の手数も削減して、製造コストを低減することができ経済性を向上させることができる。
【００４０】
また、背厚（７ｔ）が腹厚（８ｔ）と比較して厚くすることができるため、鋸身（１）の腰が強く、腹厚（８ｔ）を十分薄くしても鋸身（１）の捩じれが少なくなり、曲げに対する強度を確保できる。さらに回転砥石（１１）の回転軸をアサリ付第一基体（１ｂ）の移送ラインに対して鋭角をなすように設定して研磨するため、背部（７）と腹部（８）の境界部に連続的に隅肉部（７ａ）を形成でき、鋸身（１）の曲げに対する耐久性が向上するとともに、研磨により鋸歯部（２）に形成される筋目が十分細かくなって、鋸歯部（２）の周辺に発生する応力集中を防止し、曲げ方向に対する強度を確保して鋸歯の欠損を減少することができ、さらに、歯先が揃った綺麗なアサリが得られ、鋸引きにおいて被切断材の引き目を綺麗に仕上げることができるとともに、被切断材との摩擦による抵抗が少なく、鋸引きが軽快となる。
【００４１】
以上により、材料に薄い鋼板を使用することができるとともに研磨量を減少させることで、材料コストを低減でき、また製造工程の手数も削減して製造コストを低減でき、鋸身の厚さが均一で、且つ歪みがない鋸身である手引き鋸を安価に製造できる製造方法を提供することができる。
【図面の簡単な説明】
【図１】鋸身の製造工程の手順である。
【図２】鋸身の模式的断面図である。
【図３】アサリ付第一基体を片面研磨している状態の正面図である。
【図４】図３のＨ方向から見た側面図である。
【図５】実施例１に係る手引き鋸の鋸歯部を右側面から見た部分拡大図である。
【図６】実施例２に係る手引き鋸の鋸歯部を右側面から見た部分拡大図である。
【図７】実施例３に係る手引き鋸の鋸歯部を右側面から見た部分拡大図である。
【図８】従来の鋸身の模式的断面図である。
【符号の説明】
１鋸身
１ａ打抜第一基体
１ｂアサリ付第一基体
１ｃ研磨第二基体
２鋸歯部
２ａ第一鋸歯
２ｂ第二鋸歯
２ｃ鋸歯形成部
２ｔアサリ厚み巾
３下刃
４上刃
５上目
６ａ第一天
６ｂ第二天
７背部
７ａ隅肉部
７ｔ背厚
８腹部
８ｔ腹厚
９盗み部
１０ベッド
１１回転砥石
１１ａ円柱砥石部
１１ｂ円錐砥石部
１１ｃ砥石周面縁部
１１ｄ円柱砥石周面
１１ｅ連続部
１１ｆ円錐砥石周面
１２スピンドル
ｊ鋸引き方向
ｋ鋸送り方向
Ｌ１基線
Ｌ２歯丈中心線
Ｍ圧延鋼板[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a saw blade.
[0002]
[Prior art]
In order to reduce the friction between the saw blade and the workpiece and to make the sawing lighter when cutting the workpiece with a hand-drawn saw, the tip of the saw blade is alternately turned left and right alternately at a glance. The claws are arranged so that the thickness of the claws is wider than the thickness of the back, and the optimum formation of the claws differs depending on the type of material to be cut, but the thickness of the saw blade is usually used. Of 1.3 to 1.8 times is appropriate.
[0003]
Furthermore, in order to further reduce the friction between the side of the saw blade and the material to be cut, the thickness of the saw blade from the base of the saw tooth portion to the abdomen is reduced so that the abdomen and the material to be cut do not contact during sawing. As a saw with reduced friction, the blade span length of the blade body or the thickness of the back portion of the latter half of the base side is determined to be the same as or smaller than the thickness formed by the tip of the sawtooth portion forming the sawtooth. The thickness of the abdomen between the back portion and the sawtooth portion is formed to be smaller than the thickness of the back portion by providing a stealing portion on both sides of the main body, and the outer surface of the abdomen provided with the end of the sawtooth and the stealing portion is formed. A hand saw having a continuous shape is known from Japanese Patent Laid-Open No. 57-15902.
[0004]
[Problems to be solved by the invention]
As shown in FIG. 8, the conventional hand saw is manufactured by using a grinding means such as a grindstone with a steel plate member having a clam thickness width (2t), and the back portion is narrower than the clam thickness width (2t). (7t) and the abdomen is polished symmetrically so that the abdomen gradually increases from the thinnest abdominal thickness (8t) to the clam thickness width (2t), and finally saw blades are sharpened to produce a saw blade Therefore, it is not necessary to apply the claws by leaving the clam thickness width (2t) wider than the spine width (7t) by polishing.
[0005]
However, since the entire surface of the back part, the abdomen part, and the sawtooth part is cut out by the polishing means, it is necessary to use a thick steel plate member having a thickness of the clam thickness width (2 t) as the material steel plate member, which reduces the material cost. On the other hand, in the back and abdomen, since the thick steel plate member is polished to the back thickness (7t) or abdomen thickness (8t), the amount of material polishing becomes very large, and most of the material is wasted. In addition, two stages of polishing processing, ie, rough polishing and finish polishing of steel plate members, are required, and processing takes a long time. In addition, the grindstone used for the polishing process is also heavily worn, and the production cost is high, such as the need for replacement thereof.
[0006]
Further, due to the large amount of polishing and the limit of polishing processing accuracy, the back thickness (7t) and belly thickness (8t), which should be constant, may not be different depending on the part of the saw blade, but also during the polishing process If polishing is performed with the substrate twisted, there is a risk that the saw blade will remain distorted, and sawing will occur due to deterioration of the cut surface finish when the workpiece is cut and friction with the workpiece. There were problems such as heavy operation.
[0007]
Therefore, the present invention focuses on the fact that the rolled steel sheet formed and surface-finished by rolling has secured dimensions and surface roughness accuracy, and enables the use of a thin rolled steel sheet as a saw blade material. A hand saw that is a saw blade with uniform thickness and no distortion by reducing costs, reducing the amount of polishing in the polishing process, and reducing manufacturing costs by reducing the number of steps in the manufacturing process. It is an object of the present invention to provide a manufacturing method that can manufacture a product at low cost.
[0008]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, In a method for manufacturing a hand saw that performs polishing by using a rotating grindstone as a polishing means for both side surfaces of the saw blade, and setting the rotation shaft of the rotating grindstone at an acute angle with respect to the transfer line of the saw blade, The rolled steel plate (M) is punched into the contour shape of the saw blade (1) to form a punched first substrate (1a), and the edge forming the sawtooth of the stamped first substrate (1a) A first step of forming a sawtooth forming portion (2c) corresponding to the sawtooth to be vertically formed and applying a clam to form a first base with claws (1b), and fixing the first base with claws (1b) By means of transporting and the spindle (12) Said It comprises polishing means for rotating the rotating grindstone (11), Said The abdomen forming surface obtained by dividing the peripheral surface of the rotating grindstone (11) or a part thereof by a virtual line into the back part (7) and the abdomen forming part continuous therewith by polishing means. In the state where the peripheral edge portion (11c) of the grindstone forms a fillet portion (7a) at the boundary between the back portion (7) and the abdomen portion (8), and the claws are secured, the first base with claws Only the abdomen forming part on both sides of (1b) is polished on one side or both sides at the same time to form a stealing part (9) to form the abdomen (8) and aligning the claws, the claws of the sawtooth forming part (2c) A second step of forming the polished second substrate (1c) by setting the thickness width (2t) to be larger than the back thickness (7t) of the back portion (7), and the saw blade forming portion (2c) by the conspicuous means, the first saw blade (2a) or the second sawtooth (2b) or the sawtooth portion (2) in which these are mixed Basic to a method for manufacturing a guide saw comprising a third step of the saw body (1).
[0009]
DETAILED DESCRIPTION OF THE INVENTION
as well as
【Example】
(Example 1)
The manufacturing method of the saw blade of the folding hand-drawn saw according to the first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a procedure of the saw blade manufacturing process, FIG. 2 is a schematic sectional view of the saw blade, FIG. Fig. 4 is a front view showing a state where the first substrate with claws is polished on one side, and Fig. 4 is a side view seen from the H direction in Fig. 3. First, a rolled steel plate M having a thickness of 0.8 mm is used as a first step. The outer contour shape of the saw blade 1 having a total length of 300 mm and a maximum height of 40 mm is punched by a press cutter to form a punched first base body 1a, and a sawtooth forming portion 2c serving as a basis of the sawtooth portion 2 is pressed at the edge of the abdomen 8 At the same time, the sawtooth forming portion 2c is alternately bent and applied to the rolled steel plate M to the left and right at a glance, and subjected to clawing to obtain the first substrate 1b with claws. The clams have an interval formed by a virtual line connecting the tip of the sawtooth forming portion 2c bent to the right side and a virtual line connecting the tip of the sawtooth forming portion 2c bent to the left side, that is, the set thickness width 2t is the rolled steel plate M. The thickness is slightly wider than the thickness of 1.2 mm.
[0010]
Next, as a second step, the side surface of the first base 1b with claws and a position 20 mm from the tip of the sawtooth forming portion 2c is set as the base line L1, and both side surfaces from the tip of the sawtooth forming portion 2c to the base line L1 are Polishing is performed so as to be continuous with the sawtooth forming portion 2c, and the abdomen 8 is formed to form the polished second substrate 1c. That is, to support the handle of the hand saw, the base side rear end is not polished and the support surface 13 is left, and the left and right sides of the first base 1b with claws are symmetrical from the front end to the vicinity of the base side rear end. The clam thickness width 2t is made larger than the back thickness 7t of the back portion 7, and polishing is performed by a polishing means described later so as to secure the claws. The abdomen 8 is polished uniformly left and right to eliminate the stealing part 9 so that the abdominal thickness 8t of the abdomen 8 is constant at 0.6 mm, and the amount of polishing is reduced in the vicinity of the sawtooth forming part 2c. Then, the sawtooth forming portion 2c and the abdominal portion 8 are smoothly connected to each other, and the tip portion is only slightly polished to align the claws of the sawtooth forming portion 2c. Since the polishing amount and the polishing portion are greatly related to the strength of the finished saw blade 1 against bending and twisting, the strength of the saw blade 1 is adjusted by increasing or decreasing the polishing amount or reducing the polishing near the support surface 13. Can do.
[0011]
As shown in FIG. 3, the polishing means used in the second step is a bed 10 for attracting and fixing the first substrate 1b with claws using electromagnetic force, and a driving means for transferring the bed 10 in the direction of the arrow. The rotating grindstone 11 is composed of a transfer means (not shown) and a rotating grindstone 11 that is rotated by a spindle 12. The rotating grindstone 11 secures an interval with the bed 10 so as to sandwich and grind the first substrate 1b with claws. The positioning is fixed.
[0012]
The rotary grindstone 11 has a shape in which a truncated cone cone portion 11b having a bottom diameter of 150 mm is continuously formed on a cylindrical grindstone portion 11a having a diameter of 150 mm and a thickness of 12 mm, and the continuous portion 11e is smoothly and continuously formed. The shape of the conical grindstone portion 11b is set so that the peripheral surface 11f of the conical grindstone slightly grinds the tip of the sawtooth forming portion 2c when the abdomen 8 of the first base 1b with claws is polished. The rotational axis of the rotating grindstone 11 is parallel to the side surface of the first substrate 1b with claws adsorbed and fixed to the bed 10, and the angle θ with respect to the transfer line which is a virtual line parallel to the transfer direction of the bed 10 is 70 degrees. Is set to
[0013]
As shown in FIG. 4, when the polishing means is viewed from the H direction, the projection of the peripheral edge portion 11c of the grindstone is elliptical, the peripheral surface 11d of the cylindrical grindstone is parallel to the side surface of the first base 1b with claws, and the continuous portion 11e is also formed. It is a smooth curve.
[0014]
In the case of polishing, first, the sawtooth forming portion 2c of the first substrate 1b with claws is made parallel to the transfer line of the bed 10, and the point on the grindstone peripheral surface edge portion 11c closest to the bed 10 is the base line. After the first substrate 1b with claws is adsorbed and fixed so as to be on the extended line of L1, the bed 10 is transferred and the rotating grindstone 11 is brought into contact with the side surface of the first substrate 1b with claws fixed to the bed 10. Then, the side surface of the first substrate 1b with claws is polished to form the stealing portion 9, and then the back surface is similarly polished so that the abdominal thickness 8t is a constant thickness of 0.6 mm, and the claws on both sides are neatly aligned. The clad thickness width 2t is secured to about 1.2 mm, and the back thickness 7t does not polish the back portion 7, so that the polished second substrate 1c having the thickness of the rolled steel sheet M of 0.8 mm is obtained.
[0015]
According to the above polishing means, since the rotational axis of the rotating grindstone 11 is positioned and fixed with the angle θ with respect to the transfer line of the bed 10 being 70 degrees, the sawtooth forming portion 2c of the first base 1b with claws is parallel to the transfer direction of the bed 10. By securely adsorbing and fixing in such a manner, the abdomen 8 (thickness of the rotating grindstone 11 is 12 mm in thickness) × sin 70 degrees in width is accurate and easy without causing distortion of the first substrate 1b with claws during polishing. The boundary portion from the abdomen 8 to the back portion 7 has a width of about 1.9 mm when the thickness of the stealing portion 9 is 0.2 mm. By forming the fillet portion 7a with the shape of the projection of the portion 11c, the sawtooth-forming portion 2c is smoothly continuous, and the amount of polishing of the sawtooth-forming portion 2c decreases toward the tip portion. 2c clams Can be aligned. Furthermore, since the amount of polishing in the polishing process is very small, it is only necessary to use a grinding wheel for finishing, and since it is easy to ensure the processing accuracy, the polished surface can be finished extremely smoothly and the processing time is also short. Therefore, the heat generated by the polishing is small and the influence on the rolled steel sheet M is small.
[0016]
The polishing means is not limited to the above embodiment, and the shape and size of the rotating grindstone 11 and the angle θ formed by the rotation shaft and the transfer line of the bed 10 are the shape of the saw blade 1 to be manufactured and the width of the abdomen 8. Needless to say, it can be changed according to, for example, a chamfering is formed on the peripheral edge 11c of the grindstone because it is a part forming the fillet 7a, and the angle θ Alternatively, the angle between the rotating shaft and the first base 1b with the claws may be set in an arbitrary direction by making the shape of the grindstone a frustoconical shape.
[0017]
However, if the angle θ formed by the rotation axis and the transfer line is too large (about 80 degrees or more), the fillet portion 7a becomes small, and the lines of the rotating grindstone 11 on the surface of the abdomen 8 are in the longitudinal direction of the saw blade 1. Since they are formed roughly parallel and slightly rough, it is not preferable for ensuring the strength of the saw blade in the bending direction. On the other hand, if the angle θ is reduced (about 60 degrees or less), the width of the fillet portion 7a is increased, so that the difference in thickness between the back portion 7 and the abdomen portion 8 is reduced. As the friction increases and the sawing operation becomes heavy, and the width of the abdomen 8 becomes narrower than the thickness of the rotating grindstone 11, efficient polishing cannot be performed, and the abdomen 8, fillet portion 7a and claws are not able to be efficiently polished. It is necessary to use a thick rotating grindstone 11 in order to align them. Therefore, when the angle formed by the rotation axis of the rotating grindstone 11 with respect to the transfer line is set in the range of about 60 to 80 degrees, the lines formed on the surface of the abdomen 8 are sufficiently fine, and the strength in the bending direction of the saw teeth can be secured and the corners can be secured. It is preferable because the width of the meat portion 7a is moderate and efficient polishing can be performed.
[0018]
In the second step, polishing was performed on each side, but it is also possible to perform both sides simultaneously or continuously. First, an example of a means for simultaneously polishing both sides will be described. First substrate 1b with claws A pair of rotating grindstones 11 rotated by a spindle 12 among transfer means for transferring the first substrate 1b with claws and holding means 13 for clamping the support surface 13 using a clamp or the like and the polishing means used in the second step. At the same time as installing the pair of rotating grindstones 11 so that the circumferential surface 11d of the rotating grindstone secures a gap so as to sandwich the abdomen forming portion of the first base 1b with claws transferred by the transfer means. The angle formed between the rotation axis of the rotating grindstone 11 and the transfer line is set to about 60 to 80 degrees, and the rotation direction of each rotating grindstone 11 is transferred as the transfer direction of the first substrate 1b with claws. By inserting the first substrate 1b with clams at a slower transport speed than the peripheral speed of the grinding wheel 11 in the gap, abdominal 8 is to simultaneously polishing both surfaces of the fillet portions 7a and clams.
[0019]
Next, an example of continuous polishing means will be described. Transfer means for holding and transferring a pair of polishing apparatuses comprising a spindle 12 and a bed 10 to which a rotating grindstone 11 is attached and a first substrate 1b with claws using a clamp or the like. The bed 10 is continuously arranged in parallel to the transfer direction on the front and back of the first substrate 1b with claws so as to contact both surfaces of the first substrate 1b with claws, and the first substrate 1b with claws. The rotary grindstones 11 that are fixed to face the bed 10 so as to sandwich the drum are rotated by the spindles 12 and are positioned so that both surfaces of the first base 1b with claws can be polished symmetrically. The rotation axis is set parallel to the bed 10 and the angle with respect to the transfer direction of the first substrate 1b with the set is set to be 60 to 80 degrees. One base abdominal 8 is to continuously polished fillet 7a and clams.
[0020]
According to the polishing means according to the above example, since the number of steps for turning the first substrate 1b with claws upside down and fixing it to the bed 10 can be reduced compared to the polishing means for polishing one side at a time, the abdomen 8 and the back part 7 having a certain size can be reduced. The saw blade 1 can be efficiently manufactured, and the double-sided simultaneous polishing means can quickly perform polishing without distortion without fixing the first substrate 1b with claws to the bed 10 simultaneously.
[0021]
Finally, as a third step, the sawtooth portion 2 is formed by the existing sharpening forming means to complete the saw blade 1. The shape of the sawtooth portion 2 will be described in detail. As shown in FIG. 5, the sawtooth portion 2 is composed of a first sawtooth 2a and a second sawtooth 2b, and each first sawtooth 2a has a section A as shown in FIG. , The lower blade 3 on the sawing direction j side of the surface opposite to the direction bent by the set-up (hereinafter referred to as “claw inner surface”), the upper blade 4 on the saw feed direction k side, and the upper blade 4 on the tip, An upper eye 5 is formed so as to intersect with the blade, and a tip portion where the lower blade 3 and the upper eye 5 intersect forms a first ceiling 6a. That is, the first sawtooth 2a is formed with claws in the direction of the surface (hereinafter referred to as "tooth back") opposite to the surface (hereinafter referred to as "tooth surface") on which the lower blade 3 or the like is formed. The top 6a constitutes the widest portion of the sawtooth portion 2, that is, the clam thickness width 2t.
[0022]
Next, as shown in the B cross section of the second sawtooth 2b, the lower blade 3 is not formed on the side of the sawing direction j, and the surface in the direction bent by the setting of the claws (hereinafter referred to as “claw outer surface”). An upper blade 4 is formed on the side of the saw feed direction k, and an upper eye 5 is formed on the tip, and the tip of the upper eye 5 forms a second top 6b. Therefore, the second sawtooth 2b is bent in the direction where the upper blade 4 and the like are formed, that is, in the direction of the tooth surface, to form a set of claws. It is narrower than the opening width of the heaven 6a.
[0023]
The first sawtooth 2a and the second sawtooth 2b are arranged in such a manner that the tooth surface and the back of the first sawtooth 2a of the fourth eye are alternately arranged so as to face the left and right of the saw blade 1. The saw blades 2b are formed at a glance for every fourth of the first saw blades 2a, and the second saw blades 2b are also arranged so that the tooth surface and the back of the teeth are alternately directed to the left and right.
[0024]
Further, when the saw blade 1 is viewed from the C direction, the first ceiling 6a and the second ceiling 6b do not overlap each other, and the first ceiling 6a and the second ceiling 6b are arranged in the width direction of the clam thickness width 2t. That is, there are two first ceilings 6a on the left and right sides, two second ceilings 6b are positioned between them, and the first ceiling 6a and the second ceiling 6b are arranged in the width direction.
[0025]
Therefore, if there are only two first ceilings 6a on the left and right, a mountain with a triangular cross-section remains at the center of the bottom of the pull of the material to be cut. Although it is heavy and the sharpness is deteriorated, the four peaks of the first heaven 6a and the second heaven 6b are arranged so that a mountain having a triangular cross-section does not remain at the center of the bottom surface of the pull and the operation is light in the cutting operation. And sharpness is improved.
[0026]
According to the horizontal saw of Example 1 described above, the thickness of the rolled steel sheet M as a material only needs to have a thickness of 7 t, and the thin rolled steel sheet M can be used, so that the material cost is reduced. The portion to be polished and finished is only the abdomen 8 of the saw blade 1 and a part of the saw blade formation 2c, so that the amount of polishing of the material is smaller than that of the conventional manufacturing method in which the entire saw blade 1 is formed by polishing. The amount of material can be reduced and the waste of materials can be reduced. Also, the polishing method is simple and the saw blade 1 can be polished without distortion, so that the number of manufacturing steps is reduced and the number of manufacturing steps is reduced, thereby reducing the manufacturing cost. Can be economical.
[0027]
Further, since the back thickness 7t can be made thicker than the belly thickness 8t, the saw blade 1 has a strong waist, and even if the belly thickness 8t is sufficiently thin, the twist of the saw blade 1 is reduced, and the strength against bending is increased. It can be secured. Further, in order to polish by setting the rotation axis of the rotating grindstone 11 so as to make an acute angle with respect to the transfer line of the first substrate 1b with claws, a fillet portion 7a is continuously formed at the boundary portion between the back portion 7 and the abdominal portion 8. In addition to improving the durability of the saw blade 1 with respect to bending, the lines formed in the sawtooth portion 2 by polishing become sufficiently fine to prevent stress concentration occurring around the sawtooth portion 2 and to increase the strength in the bending direction. It is possible to reduce the loss of the sawtooth, and a beautiful clam with the tooth tips aligned is obtained, and the cut of the material to be cut can be finely finished in the sawing, and with the material to be cut There is little resistance due to friction and the sawing is light.
[0028]
Further, since the rolled steel plate M is cut into the outer contour shape of the saw blade 1 and then subjected to the processing such as polishing, the height of the back portion 7, the height of the saw blade 1, the degree of formation of the claws, the shape of the saw tooth portion 2 Can be easily processed, such as by not forming the stealing portion 9 in the part where strength is required partially, thereby obtaining waist strength and tooth shape according to the purpose of the hand saw be able to. The saw according to the present invention is not limited to the above-described embodiment, and it goes without saying that dimensions, shapes, or materials suitable for the purpose of the hand saw can be used.
[0029]
(Example 2)
The hand saw according to the second embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a partially enlarged view of the saw blade 1 of the folding hand saw according to the second embodiment of the present invention as viewed from the right side. A rolled steel plate M having a thickness of 0.8 mm is cut into a contour shape of a saw blade 1 having a total length of 300 mm and a height of 35 mm by a press cutter, and a sawtooth forming portion 2c is formed by a press to obtain a first substrate 1b with claws. One step, the second step of polishing the side surface of the first substrate 1b with claws, is the same as in Example 1, but is characterized by the shape of the sawtooth portion 2 formed in the third step. Hereinafter, the shape of the sawtooth portion 2 will be described in detail.
[0030]
As shown in FIG. 6, the sawtooth portion 2 is composed of a first sawtooth 2a and a second sawtooth 2b, and the shape of each first sawtooth 2a is the same as that of the first embodiment, and the sawing direction j of the inner surface of the clam is j. A lower blade 3 is formed on the side, an upper blade 4 is formed on the side of the saw feed direction k, and an upper eye 5 is formed so as to intersect with the lower blade 3 and the upper blade 4 on the tip, and the lower blade 3 and the upper eye 5 intersect. The tip portion forms the first ceiling 6a. That is, the first sawtooth 2a is bent in the direction of the back of the tooth to form a set, and each first top 6a constitutes the widest portion of the settooth thickness width 2t of the sawtooth portion 2.
[0031]
Next, the lower blade 3 on the sawing direction j side is not formed on the second sawtooth 2b, and the upper blade 4 is formed symmetrically with respect to the tooth height center line L2 on the saw feed direction k side. The upper eye 5 is formed symmetrically with respect to the longitudinal direction of the saw blade 1. The upper eye 5 does not have a pointed second top 6b and has a width in the horizontal direction, and the second saw-tooth 2b does not perform any attachment on either side.
[0032]
Since the sawtooth portion 2 is configured in this way, when the saw blade 1 is viewed from the right side, the first sawtooth 2a of the fourth eye is arranged so that the tooth surface and the back of the teeth are alternately alternately turned to the left and right. 2b is formed at a glance for every fourth of the first sawtooth 2a, and the second sawtooth 2b is symmetrical, and therefore has the same shape when viewed from either side. Further, when the saw blade 1 is viewed from the E direction, the horizontal second ceiling 6b of the second sawtooth 2b exists between the first ceilings 6a, and the following effects are obtained in the sawing operation and sharpness. .
[0033]
That is, when there are only two first ceilings 6a on the left and right when viewed from the E direction, a mountain having a triangular cross-section remains at the center of the bottom surface of the pull of the material to be cut, and this mountain hinders the cutting operation. . Therefore, the sawing is heavy and the sharpness is worsened. On the other hand, according to the hand saw which forms the second top 6b of the second saw blade 2b so as to connect the first top 6a as in the present embodiment, the function of the second saw blade 2b to cut the bottom of the pull is improved. As a result, a mountain having a triangular cross-section does not remain in the center of the bottom surface of the pull, and the operation becomes very light in cutting work and sharpness is improved.
[0034]
(Example 3)
The folding hand saw according to the third embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a partially enlarged view of the saw blade 1 of the hand saw according to the third embodiment of the present invention as viewed from the right side. A rolled steel plate M having a thickness of 0.8 mm is cut into a contour shape of a saw blade 1 having a total length of 300 mm and a height of 35 mm by a press cutter, and a sawtooth forming portion 2c is formed by a press to obtain a first substrate 1b with claws. One step, the second step of polishing the first substrate 1b with claws, is the same as in Example 1, but is characterized by the shape of the sawtooth portion 2 formed in the third step. Hereinafter, the shape of the sawtooth portion 2 will be described in detail.
[0035]
As shown in FIG. 7, the sawtooth portion 2 is composed of a first sawtooth 2a and a second sawtooth 2b, and the shape of each first sawtooth 2a is the same as that of the first embodiment, and the sawing direction j of the inner surface of the clam is j. A lower blade 3 is formed on the side, an upper blade 4 is formed on the side of the saw feed direction k, and an upper eye 5 is formed so as to intersect with the lower blade 3 and the upper blade 4 on the tip, and the lower blade 3 and the upper eye 5 intersect. The tip portion forms the first ceiling 6a. That is, the first sawtooth 2a is bent in the direction of the back of the tooth to form a clam, and each first ceiling 6a constitutes the widest part of the sawtooth portion 2 having a thickness 2t.
[0036]
Next, the lower blade 3 on the sawing direction j side is not formed on the second sawtooth 2b, and the upper blade 4 is formed symmetrically with respect to the tooth centerline L2 on the saw feed direction k side. The upper eye 5 is formed symmetrically with respect to the longitudinal direction of the body 1. Unlike the second embodiment, the upper eye 5 is formed so that the second top 6b is pointed, and the second sawtooth 2b has no set on either side.
[0037]
Since the sawtooth portion 2 is configured in this way, the first sawtooth 2a of the fourth eye is arranged so that the tooth surface and the back of the teeth are alternately alternately turned to the left and right, and the second sawtooth 2b is one for each four eye of the first sawtooth 2a. Since the second sawtooth 2b is symmetrical, the second sawtooth 2b has the same shape when viewed from either side. Therefore, when the saw blade 1 is viewed from the G direction, the second top 6b of the second saw tooth 2b exists between the first tops 6a, and the following effects are obtained on the sharpness.
[0038]
That is, when there are only two first ceilings 6a on the left and right when viewed from the G direction, a mountain having a triangular cross section remains at the center of the bottom surface of the cut of the material to be cut, and this mountain hinders the cutting operation. The sawing is heavy and the sharpness becomes worse. On the other hand, according to the hand-drawing saw in which the second top 6b of the second saw tooth 2b is formed between the first top 6a as in the present embodiment, the function of the second saw tooth 2b cutting the bottom of the pulling eye is enhanced. Therefore, there is no triangular peak in the center of the bottom surface of the pull, and the operation becomes lighter in cutting work and the sharpness is improved.
[0039]
【The invention's effect】
According to the method for manufacturing a hand saw according to the present invention described above, the rolled steel plate (M) as a material only needs to have a back thickness (7 t), and a thin rolled steel plate (M) is used. Material costs can be reduced, and only the abdomen (8) of the saw blade (1) and part of the saw blade formation (2c) are polished and finished, so that the entire conventional saw blade (1) Compared with the manufacturing method formed by polishing, the amount of polishing of the material is very small, the waste of the material can be reduced, and the polishing method is simple and polishing without causing distortion in the saw blade (1) can be performed. However, the number of manufacturing steps can be reduced, the manufacturing cost can be reduced, and the economy can be improved.
[0040]
Moreover, since the back thickness (7t) can be made thicker than the abdominal thickness (8t), the saw blade (1) has a strong waist, and even if the abdominal thickness (8t) is sufficiently thin, the saw blade (1) The twisting of the wire is reduced, and the strength against bending can be secured. In addition, since the rotating shaft of the rotating grindstone (11) is set so as to form an acute angle with respect to the transfer line of the first substrate (1b) with claws, it is continuous to the boundary between the back (7) and the abdomen (8). The fillet portion (7a) can be formed, the durability of the saw blade (1) against bending is improved, and the lines formed in the saw tooth portion (2) by polishing become sufficiently fine, so that the saw tooth portion (2) Stress concentration around the edge of the wire, ensuring strength in the bending direction, and reducing sawtooth loss. In addition, a clean clam with tooth tips aligned is obtained. The finish can be finished neatly, and resistance to friction with the material to be cut is low, so that sawing is light.
[0041]
As described above, it is possible to use thin steel plate as the material and reduce the amount of polishing, thereby reducing the material cost, reducing the number of manufacturing steps and reducing the manufacturing cost, and the thickness of the saw blade is uniform. In addition, it is possible to provide a manufacturing method that can inexpensively manufacture a hand saw that is a saw blade having no distortion.
[Brief description of the drawings]
FIG. 1 is a procedure of a saw blade manufacturing process.
FIG. 2 is a schematic cross-sectional view of a saw blade.
FIG. 3 is a front view showing a state where the first substrate with claws is polished on one side.
4 is a side view as seen from the H direction in FIG. 3;
FIG. 5 is a partially enlarged view of the sawtooth portion of the hand saw according to the first embodiment when viewed from the right side surface.
FIG. 6 is a partially enlarged view of the sawtooth portion of the hand saw according to the second embodiment as viewed from the right side surface.
FIG. 7 is a partially enlarged view of the sawtooth portion of the hand saw according to the third embodiment as viewed from the right side surface.
FIG. 8 is a schematic cross-sectional view of a conventional saw blade.
[Explanation of symbols]
1 saw blade
1a Punched first substrate
1b First substrate with claws
1c Polished second substrate
2 Sawtooth part
2a First saw blade
2b Second sawtooth
2c sawtooth forming part
2t clam thickness
3 Lower blade
4 Upper blade
5 Top eyes
6a First heaven
6b Second heaven
7 back
7a Fillet
7t thickness
8 Abdomen
8t stomach
9 Thief
10 beds
11 Rotating whetstone
11a cylindrical grinding wheel
11b Conical whetstone
11c Wheel peripheral edge
11d Cylindrical grinding wheel circumference
11e continuous part
11f Conical whetstone circumference
12 spindle
j Sawing direction
k Saw feed direction
L1 baseline
L2 Tooth height center line
M Rolled steel sheet

Claims

In a method for manufacturing a hand saw that performs polishing by using a rotating grindstone as a polishing means for both side surfaces of the saw blade, and setting the rotation shaft of the rotating grindstone at an acute angle with respect to the transfer line of the saw blade,
The rolled steel plate (M) is punched into the contour shape of the saw blade (1) to form a punched first substrate (1a), and the edge forming the sawtooth of the stamped first substrate (1a) A first step of forming a sawtooth forming portion (2c) corresponding to the sawtooth to be vertically formed and applying a clam to form a first base with claws (1b), and fixing the first base with claws (1b) a transfer means for transferring Te consists polishing means for rotating said grinding wheel (11) by a spindle (12), by the polishing means, the peripheral surface or a part of the grinding wheel (11), a first substrate with clams (1b) is brought into contact with the abdomen formation surface divided by a virtual line between the back part (7) and the abdomen formation part continuous thereto, and the peripheral edge (11c) of the grindstone has the back part (7) and the abdomen (8). The fillet (7a) is formed at the boundary of the And polishing only the abdomen forming part on both sides of the first base with the claws (1b) for each side or both sides simultaneously, forming a stealing part (9) to make the abdomen (8) and aligning the claws, A second step of forming the polished second substrate (1c) by setting the thickness width (2t) of the sawtooth forming portion (2c) to be larger than the back thickness (7t) of the back portion (7), and the sawtooth forming portion (2c) Production of a hand-drawn saw comprising the third step of forming the first saw blade (2a) or the second saw blade (2b) or the saw blade portion (2) in which these are mixed by the conspicuous means to form the saw blade (1). Method.

The conspicuous means mixes the first sawtooth (2a) and the second sawtooth (2b) alternately for each predetermined unit number, and the first sawtooth (2a) is lowered in the sawing direction (j) side. The blade (3), the upper blade (4) on the saw feed direction (k) side, the lower blade (3) at the tip, and the upper eye (5) so as to cross the upper blade (4) 2c) is formed on the inner surface side of the clam, and the left and right opening width of the first top (6a) is the widest part of the clam thickness width (2t), and the second saw tooth (2b) is on the saw feed direction (k) side. The upper blade (4) and the upper eye (5) at the tip are formed on the outer surface of the clam, and the width of the second ceiling (6b) is narrower than the width of the first ceiling (6a). The method of manufacturing a hand saw according to claim 1.

The second saw tooth (2b) is not set up, and the upper blade (4) is formed symmetrically with respect to the tooth center line (L2) on the saw feed direction (k) side, The method according to claim 2, wherein the upper eye (5) is formed symmetrically with respect to the longitudinal direction of the saw blade (1) so that 6b) has a width in the horizontal direction.

The second sawtooth (2b) is not set up, and the upper blade (4) is formed symmetrically with respect to the tooth centerline (L2) on the saw feed direction (k) side, and the upper eye (5) 3. The method according to claim 2, wherein the second heaven (6b) is formed symmetrically with respect to the longitudinal direction of the saw blade (1).