JP4145716B2

JP4145716B2 - Rolling die for deep grooved screw and method for manufacturing deep grooved screw

Info

Publication number: JP4145716B2
Application number: JP2003146034A
Authority: JP
Inventors: ▲隆▼夫若井
Original assignee: 若井産業株式会社
Priority date: 2003-05-23
Filing date: 2003-05-23
Publication date: 2008-09-03
Anticipated expiration: 2023-05-23
Also published as: JP2004344952A

Description

【０００１】
【発明の属する技術分野】
この発明は、軸部の外周面の雄ネジに深溝を設けた構造を有し、木造建築での木材の結合に使用する深溝付きスクリュウを転造するためのダイスと、このダイスを用いたスクリュウネジの製造方法に関する。
【０００２】
【従来の技術】
木材の結合に使用するスクリュウネジには、ねじ込み時の抵抗の発生が少なく、円滑にねじ込むことができると共に、締結後は外部からの衝撃や振動が加わっても緩むことのない、優れた緩み止め機能が要求される。
【０００３】
従来、このようなスクリュウネジとして提案されている深溝付きスクリュウネジ１は、図５（Ｃ）と図６のように、一端に頭部２と他端に先端３を有する軸部４の外周面に、頭部２側にブランク部５を残して途中の位置から先端の範囲に雄ネジ６を設け、この雄ネジ６にネジ山と交差するように、ネジ山の谷よりも深い深溝７を設けた構造になっている（例えば、特許文献１参照）。
【０００４】
このような、深溝付きスクリュウネジ１は、雄ネジ６が谷径に等しい孔を穿孔しつつその周囲にネジ山が食い込み、雄ネジ６のネジ山に設けた深溝７が、ねじ込み時に木材の繊維を切りながら進入すると共に、切り屑が深溝７内に収納されるので、ねじ込み操作が円滑に行え、締結後は深溝７に木の繊維が食い込み、緩み止め機能が得られるという効果がある。
【０００５】
通常、木材用のスクリュウネジは、対向面に雄ネジ形成用の突条を設けた左右対称となる一対の転造ダイスを用い、このダイス間に送り込まれた図５（Ａ）のようなネジ下のリベット８を挟み付け、一方ダイスの移動により転がして雄ネジを圧造する。
【０００６】
雄ネジ形成用の突条は、初めは細く高く、終わりに向かって徐々に幅が広くなり、突条間の溝はこれと逆に終わりに向かって徐々に幅が狭くなり、ネジ下のリベットは、突条で押さえ込まれた部分の肉代の移行部分が溝に入り込んで成形され、ネジ山が徐々に形通りに圧造されて所定のスクリュウネジが完成することになる。
【０００７】
なお、スクリュウネジには先端が必要なので、転造ダイスの下部には、先端を圧造するための圧造揉み切り部が設けられている。
【０００８】
上記のような転造ダイスを用いたスクリュウネジの製造において、雄ネジに深溝を形成するには、一方の転造ダイスの中間に縦のロレットを設け、このロレットで雄ネジのネジ山にＶ字状の凹溝を形成する方法や、上記転造ダイスでスクリュウネジを圧造した後、別の工程で雄ネジのネジ山にカッターで切り込みを入れて凹溝を形成する方法が考えられる。
【０００９】
【特許文献１】
特開平１１−６２９３４号公報（図１）
【００１０】
【発明が解決しようとする課題】
ところで、前者のような一方の転造ダイスの中間に縦のロレットを設けてＶ字状の凹溝を形成する方法では、ネジ山のみに凹溝を設けることは可能であったが、雄ネジの谷部よりも深く凹溝を形成しようとした場合、谷部に凹溝を形成することによって発生する肉代の移行を処理しなければならないという問題が生じ、従って、この問題を解決しなければ、雄ネジの谷部よりも深い深溝付きのスクリュウネジを圧造することができないことになる。
【００１１】
また、後者の方法は、別に凹溝を形成する工程が必要になり、工程数が増えることで製作能率が低下し、コストアップにつながるという問題がある。
【００１２】
そこで、この発明の課題は、雄ネジの谷部に凹溝を形成することによって発生する肉代の移行の問題を解決することができ、１工程で雄ネジのネジ山を変形させることなく雄ネジと、雄ネジの谷部より深い深溝の形成が行え、深溝付きのスクリュウネジを低コストで製作することができる転造ダイスと、この転造ダイスを用いた深溝付きスクリュウの製造方法を提供することにある。
【００１３】
【課題を解決するための手段】
上記のような課題を解決するため、請求項１の発明は、軸部の外周に雄ネジと、この雄ネジと交差する深溝を設けた深溝付きスクリュウを造るための転造ダイスであり、この転造ダイスが、相対向して配置する固定ダイスと移動ダイスの組み合わせからなり、固定ダイスと移動ダイスの相対向する転造面のそれぞれに、全面にわたって角度のきつい深溝形成用突条を一定間隔の配置で設け、この両転造面を入側の先端から後端に向けて、雄ネジの仮成形部、深溝成形部、雄ネジの主成形部、雄ネジの仕上げ成形部に順次設定し、上記雄ネジの仮成形部は、各深溝形成用突条間の位置に、深溝形成用突条と同じかそれよりも低い高さを有し、緩い角度で傾斜すると共に傾斜方向に延長状となる突条が一定間隔の配置で設けられ、上記深溝成形部は、深溝形成用突条だけを設け、雄ネジの主成形部は、各深溝形成用突条間の位置に、深溝形成用の突条よりも低い高さで上記雄ネジの仮成形部に設けた突条の延長状に傾斜し、幅が後端に向かって漸次広くなり、傾斜方向に延長状となるよう形成された突条が一定間隔の配置で設けられ、上記雄ネジの仕上げ成形部は、各深溝形成用突条間の位置に、深溝形成用突条よりも低い高さで上記主成形部の突条の延長状に傾斜し、幅が後端に向かって漸次広くなり、傾斜方向に延長状となるよう形成された雄ネジ仕上げ用の突条が一定間隔の配置で設けられ、この雄ネジの仕上げ成形部において、上記各雄ネジ仕上げ用の突条間に形成される雄ネジ形成谷溝は、後端に位置するものほど幅が漸次狭くなり、その深さは最初の位置では深く途中の位置のものに向かって徐々に浅くなり、途中位置から終端の間に位置するものが同じ深さになっている構成を採用したものである。
【００１４】
請求項２の発明は、請求項１の発明において、上記深溝成形部は、深溝形成用突条の間に、雄ネジの仮成形用突条が、上記雄ネジの仮成形部に設けた突条の延長状の配置となり、雄ネジの仮成形部から雄ネジの主成形部に向かって徐々に低くなるように設けられている構成を採用したものである。
【００１５】
請求項３の発明は、請求項２の発明において、上記雄ネジの仮成形部に設けた突条と、深溝成形部に設けた雄ネジの仮成形用突条のそれぞれの幅が、雄ネジの主成形部に設けた突条の深溝成形部側先端の幅と同じ幅に設定されている構成を採用したものである。
【００１６】
ここで、上記固定ダイスと移動ダイスの全面に設ける深溝形成用突条は、例えば、ネジ下のリベットに対して二条の深溝を螺旋状に形成するような間隔で転造ダイスの全面にわたって、転造ダイスの上下方向に対して２０°程度の角度で設けられている。
【００１７】
また、雄ネジの仮成形部の突条は、その先端面が、深溝形成用突条間のフラットな底面に、その先端面が深溝形成用突条と同じかそれよりも低い高さを有する断面Ｖ字状の突形に形成され、仮成形部の範囲において同じ高さ条件に設定され、ネジ下のリベットの軸部に対してＶ字状の溝を形成することにより、その肉代を軸方向の両側に押し出すことになる。
【００１８】
雄ネジの主成形部の突条は、深溝成形部に臨む入側の端部が仮成形部の突条と同様の幅を有する条件となり、出側に向けて幅が広くなり、上記Ｖ字状の溝を軸方向に押し広げることになる。
【００１９】
雄ネジの仕上げ成形部に設けた雄ネジ仕上げ用の突条は、主成形部の突条と同様の高さとなる平坦面を有する断面台形の突起となり、入側の端部が主成形部の突条の後端部と同様の幅となり、後端に位置するものほど幅が漸次広くなることで、仕上げ成形部の突条間に形成されるＶ字状の雄ネジ形成谷溝は、後端部が雄ネジの仕上がり形状になっている。
【００２０】
上記のように、雄ネジの仮成形部において、深溝形成用突条でリベットの軸部に深溝を形成すると同時に、深溝形成用突条間に設けた突条でＶ字状の溝を形成することにより、雄ネジ形成のために肉代を移行させるための下地となるＶ字状の溝が同時に形成され、このため、雄ネジの主成形部において、雄ネジ形成のための突条の食い込みには、上記下地となるＶ字状の溝が予め形成されていることになり、このため、雄ネジの主成形部における突条の食い込み時の抵抗や衝撃の発生を有効に抑えることができ、雄ネジの形成が円滑に行えることになる。
【００２１】
また、請求項４の製造方法の発明は、上記した請求項１乃至３の発明の何れかに記載の転造ダイスを用い、固定ダイスと移動ダイスでネジ下のリベットを挟み付け、移動ダイスの移動により、このリベットの円軸部外周に、先ず、雄ネジの仮成形部において、深溝形成用突条を押し込むことで、角度の急な縦方向の深溝を複数形成すると同時に、深溝間に肉代が移行して形成された膨出部に突条で雄ネジの傾斜に見合う溝を形成し、次に、深溝成形部において、角度の急な深溝に深溝形成用突条を押し込むことで深溝の成形を行い、雄ネジの主成形部において、角度の急な深溝に深溝形成用突条を押し込ながら膨出部分に形成された溝を突条で押し広げることで肉代を突条間に移行させ、雄ネジの仕上げ成形部において、深溝形成用の突条で深溝を保形しながら、上記溝を雄ネジ仕上げ用の突条で軸方向に押し広げることで雄ネジ形成用の突条間の谷溝に肉代を移行させることにより、この谷溝によって深溝で分断された雄ネジを形成する構成を採用したものである。
【００２２】
上記固定ダイスと移動ダイスの雄ネジの仮成形部で、ネジ下のリベットの軸部に対して深溝形成用突条を押し込むことで、角度の急な複数の割溝を形成すると共に、割溝の形成によって生じた軸部の肉代を割溝間に移行させて膨出部を形成し、この膨出部に突条で雄ネジの傾斜に見合う溝を形成し、膨出部における肉代を突条の両側軸方向に移行させ、雄ネジの主成形部と仕上げ成形部の各突条で肉代を両側軸方向に押し広げることで、雄ネジ形成用の突条間の谷溝で雄ネジを形成することができ、雄ネジを形成している工程中は深溝形成用突条が、割溝を保形しているので、割溝が崩れることなく雄ネジを転造することができ、雄ネジに深溝のあるスクリュウネジを作ることができる。
【００２３】
【発明の実施の形態】
以下、この発明の実施の形態を図示例と共に説明する。
【００２４】
この発明の転造ダイス１１は、相対向して配置する固定ダイス１２と移動ダイス１３の組み合わせからなり、固定ダイス１２と移動ダイス１３の相対向する転造面のそれぞれに、全面にわたって角度のきつい深溝形成用突条１４を一定間隔の配置で設け、この両転造面が入側の先端から後端に向けて、雄ネジの仮成形部Ａ、深溝成形部Ｂ、雄ネジの主成形部Ｃ、雄ネジの仕上げ成形部Ｄに順次設定され、両ダイス１２、１３の相対向する転造面のパターンは左右対称状となっている。
【００２５】
上記雄ネジの仮成形部Ａは、各深溝形成用突条１４間のフラットな底面に、その先端が深溝形成用突条１４と同じかそれよりも低い高さで幅が狭い断面Ｖ字状の突形に形成され、緩い角度で傾斜すると共に傾斜方向に延長状となる突条１５が一定間隔の配置で設けられている。
【００２６】
上記深溝成形部Ｂは、深溝形成用突条１４だけを設け、この深溝形成用突条１４間がネジ下のリベット８の軸部に対して直接作用しない面になっているようにするか、図１のように、深溝形成用突条１４の間に、雄ネジの仮成形用突条１５ａを、上記雄ネジの仮成形部Ａに設けた突条１５の延長状の配置となり、雄ネジの仮成形部Ａから雄ネジの主成形部Ｃに向かって徐々に低くなるように設けることができる。
【００２７】
上記雄ネジの主成形部Ｃは、各深溝形成用突条１４間の平坦面間に、深溝形成用突条１４よりも低い高さで上記雄ネジの仮成形部Ａに設けた突条１５の延長状に傾斜し、入側の端部が仮成形部の突条１５と同様の条件となり、出側に向けて幅が漸次広くなる断面Ｖ字状の突形に形成された突条１６が設けられている。
【００２８】
上記した深溝成形部Ｂの仮成形用突条１５ａは、図１の場合、雄ネジの仮成形部Ａの突条１５より広幅としたが、これら雄ネジの仮成形部Ａに設けた仮成形用突条１５と、深溝成形部Ｂの仮成形用突条１５ａの幅は、雄ネジの主成形部Ｃに設けた突条１６の深溝成形部側に位置する入側先端の幅と同じ幅に設定するようにしてもよい。
【００２９】
また、雄ネジの仕上げ成形部Ｄは、各深溝形成用突条１４間の位置に、深溝形成用突条１４よりも低い高さで上記主成形部Ｃの突条１６の延長状に傾斜し、主成形部Ｃの突条１６と同様の高さとなる平坦面を有する断面台形の突起となり、入側の端部が主成形部Ｃの突条１６の後端部と同様の幅となり、後端に位置するものほど幅が漸次広くなり、傾斜方向に延長状となるよう形成された雄ネジ仕上げ用の突条１７が一定間隔の配置で設けられている。
【００３０】
図３のように、この雄ネジ仕上げ用の突条１７間がＶ字状の雄ネジ形成谷溝１８となり、仕上げ成形部Ｄの突条１７が後端に位置するものほど幅が漸次広くなることで、雄ネジ形成谷溝１８は後端に位置するものほど幅が狭くなり、後端部が雄ネジの仕上がり形状になっている。
【００３１】
上記雄ネジ形成谷溝１８の深さは、図２のように、最初の位置では深く途中の位置のものに向かって徐々に浅くなり、途中位置から終端の間に位置するものが同じ深さになっている。
【００３２】
このように、雄ネジの仮成形部Ａ、主成形部Ｃ、仕上げ成形部Ｄに設けた雄ネジ形成用の各突条１５、１６、１７は、一定間隔の配置となるよう、深溝形成用突条１４と合成された状態で設けられ、この雄ネジ形成用の各突条１５、１６、１７は、連続した雄ネジ６を形成することができるように傾斜角度と間隔が設定されている。
【００３３】
上記転造面に設ける雄ネジの仮成形部Ａ、主成形部Ｃ、仕上げ成形部Ｄ及び深溝成形部Ｂの範囲は、例えば、仮成形部Ａはネジ下のリベットの軸部が３回転、深溝成形部Ｂは同１回転、主成形部Ｃは同４回転、仕上げ成形部Ｄは同４回転するように設定されている。
【００３４】
また、両転造ダイスの対向面における下部には、ネジ下のリベット８の軸部に先鋭状の先端３を転造するための先端形成部１９が設けてある。
【００３５】
次に、この発明の転造ダイスを用いた深溝付きのスクリュウネジの製造方法を説明する。
【００３６】
図４（Ａ）のように、固定ダイス１２に対して移動ダイス１３が退動位置にある状態で、図５（Ａ）に示すようなネジ下のリベット８の軸部を、雄ネジの仮成形部の間に供給し、図４（Ｂ）のように、移動ダイス１３を固定ダイス１２と平行に移動させると、先ず、雄ネジの仮成形部Ａの間において、回転させられたネジ下のリベット８の軸部外周に対して深溝形成用突条１４を押し込むことで、図５（Ｂ）のように、角度の急な複数の深溝７と深溝７間に肉代を移行させた膨出部９を形成し、この膨出部９に突条が食い込むことで、雄ネジ６の傾斜に見合う螺旋の溝１０を形成し、膨出部９における肉代を突条１５の両側軸方向に移行させる。
【００３７】
次に、リベット８の軸部が深溝成形部Ｂに臨むと、上記仮成形部Ａで形成した深溝７に深溝形成用突条１４が嵌まり込むことで、深溝７の形状を修正固定化する。
【００３８】
この深溝成形部Ｂに雄ネジの仮成形用突条１５ａを設けた場合、仮成形用突条１５ａで上記した螺旋の溝１０を押し広げることになる。
【００３９】
続いて、移動ダイス１３の移動に伴ってリベット８の軸部が主成形部Ｃに進入すると、主成形部Ｃの突条１６は出側に向けて漸次広幅になっているので、この突条１６が膨出部９に予め形成されたＶ字状の溝１０を押し広げることで、この膨出部９の肉代を突条１６の両側軸方向に移行させることになり、この工程中において、深溝形成用突条１４が深溝７に嵌まり込むことで、深溝７の形状の崩れ発生を防止する。
【００４０】
このように、雄ネジの仮成形部Ａにおいて、深溝形成用突条１４でリベット８の軸部に深溝７を形成すると同時に、深溝形成用突条１４間に設けた突条１５でＶ字状の溝１０を形成することにより、雄ネジ形成のために肉代を移行させるための下地となるＶ字状の溝１０が同時に形成され、このため、雄ネジの主成形部Ｃにおいて、雄ネジ形成のための突条１６の食い込み位置には、上記下地となるＶ字状の溝１０が予め形成されていることになり、このため、雄ネジの主成形部Ｃにおける突条１６の食い込み時の抵抗や衝撃の発生を有効に抑えることができ、雄ネジ６の形成が円滑に行えることになる。
【００４１】
次に、移動ダイス１３の移動に伴ってリベット８の軸部が仕上げ成形部Ｄに進入すると、この仕上げ成形部Ｄの突条１７で肉代を両側軸方向に押し広げて溝幅を広くする。
【００４２】
この仕上げ成形部の突条１７は、台形の平坦面になっているので、主成形部Ｃで形成された溝１０を両側軸方向に移行させることにより、肉代を突条１７間に押しやり、肉代は両突条１７間に形成された溝１８内に進入する。
【００４３】
上記仕上げ成形部Ｄの突条１７は、台形の平坦面になっているので、平坦面によってリベット８の軸部における深溝形成用突条１４間の部分は円軸状に成形され、しかも、この突条１７は出側に向けて漸次広幅になり、突条１７間の溝１８は逆に出側に向けて漸次狭くなっているので、突条１７で両側軸方向に押し広げられた肉代はこの突条１７間の溝１８に進入し、螺旋状の雄ネジ６に成形される。
【００４４】
上記した螺旋状の雄ネジ６の成形工程において、深溝形成用突条１４は両ダイス１２、１３の全面に設けられているので、仮成形部Ａと主成形部及Ｃび仕上げ成形部Ｄによって雄ネジ６を順次形成していくとき、深溝７は深溝形成用突条１４によって保持され、従って、深溝７の形状の変化がなく、この深溝形成用突条１４間に雄ネジ６が分断された状態で形成され、深溝７は突条１７で仕上げられた軸部に対して一部食い込み状となる。
【００４５】
従って、深溝７を保形したまま雄ネジ６を形成することができ、図５（Ｃ）のように、雄ネジ６が深溝７で分断され、雄ネジ６に対してネジ山と交差するように、ネジ山の谷径よりも深い深溝７が設けられたスクリュウネジ１を１工程で製造することができる。
【００４６】
【発明の効果】
以上のように、この発明によると、固定ダイスと移動ダイスの相対向する転造面のそれぞれに、一定間隔の配置で全面にわたって角度のきつい深溝形成用の突条を設け、この両転造面を入側の先端から後端に向けて、雄ネジの仮成形部、深溝成形部、雄ネジの主成形部、雄ネジの仕上げ成形部に順次設定したので、リベットの軸部に対して最初に深溝を形成してこれを最後まで保形することで、雄ネジの圧造時に深溝が潰れるというようなことがなく、また、リベットの軸部に対して雄ネジの仮成形部に設けた突条で深溝間に凹溝を形成することにより、次の雄ネジの主成形部における突条の食い込みが凹溝部分から始まるので、主成形部の突条の食い込み時における抵抗や衝撃の発生を防ぐことができ、リベットの軸部を円滑に転造加工することができ、精度の高い良質の深溝付きスクリュウネジを製造することができる。
【００４７】
また、深溝付きスクリュウネジを１工程で製造することができ、製作コストの低減が図れる。
【図面の簡単な説明】
【図１】この発明に係る転造ダイスにおける固定ダイスを示す正面図
【図２】固定ダイスの縦断正面図
【図３】固定ダイスの要部構造を示す斜視図
【図４】（Ａ）は転造ダイスにネジ下のリベットを供給した横断面図、（Ｂ）はネジ下のリベットの加工状態の横断面図、（Ｃ）は深溝付きスクリュウネジの加工状態の横断面図
【図５】（Ａ）は深溝付きスクリュウネジの製造に用いるネジ下のリベットの正面図、（Ｂ）は同上に深溝を形成した状態の正面図、（Ｃ）は深溝付きスクリュウネジの正面図
【図６】深溝付きスクリュウネジの拡大した横断面図
【符号の説明】
１スクリュウネジ
２頭部
３先端
４軸部
５ブランク部
６雄ネジ
７深溝
８ネジ下のリベット
９膨出部
１０溝
１１転造ダイス
１２固定ダイス
１３移動ダイス
１４深溝形成用突条
１５突条
１６突条
１７突条
１８谷溝
Ａ雄ネジの仮成形部
Ｂ深溝成形部
Ｃ雄ネジの主成形部
Ｄ雄ネジの仕上げ成形部[0001]
BACKGROUND OF THE INVENTION
The present invention has a structure in which a deep groove is provided in a male screw on an outer peripheral surface of a shaft portion, a die for rolling a screw with a deep groove used for joining wood in a wooden building, and a screw using the die The present invention relates to a screw manufacturing method.
[0002]
[Prior art]
Screw screws used for joining wood have little resistance when screwed in, and can be screwed in smoothly, and after tightening, they won't loosen even when subjected to external impacts or vibrations. Function is required.
[0003]
Conventionally, a screw screw 1 with a deep groove proposed as such a screw screw is an outer peripheral surface of a shaft portion 4 having a head 2 at one end and a tip 3 at the other end as shown in FIGS. In addition, a male thread 6 is provided in the range from the middle position to the tip, leaving the blank portion 5 on the head 2 side, and a deep groove 7 deeper than the thread valley is formed on the male thread 6 so as to intersect the thread. The structure is provided (see, for example, Patent Document 1).
[0004]
In such a screw screw 1 with a deep groove, the male screw 6 drills a hole equal to the valley diameter, and a screw thread bites around the hole, and the deep groove 7 provided in the screw thread of the male screw 6 is a fiber of wood at the time of screwing. Since the chip enters the deep groove 7 and the chip is stored in the deep groove 7, the screwing operation can be performed smoothly, and after fastening, the wood fiber bites into the deep groove 7, and the function of preventing loosening is obtained.
[0005]
Normally, a screw for wood uses a pair of symmetrical rolling dies provided with male thread forming protrusions on the opposite surface, and a screw as shown in FIG. 5A fed between the dies. The lower rivet 8 is clamped, and on the other hand, it is rolled by moving the die to forge the male screw.
[0006]
The male thread-forming ridges are narrow and high at the beginning, and gradually widen toward the end, while the grooves between the ridges gradually narrow toward the end, and the rivets under the screw In this case, the transition portion of the meat portion of the portion pressed by the ridge enters the groove and is molded, and the screw thread is gradually formed in a shape to complete a predetermined screw screw.
[0007]
In addition, since a tip is required for the screw screw, a forging slashed portion for forging the tip is provided at the lower portion of the rolling die.
[0008]
In manufacturing screw screws using the above rolling dies, in order to form a deep groove in the male screw, a vertical knurl is provided in the middle of one of the rolling dies, and V A method of forming a letter-shaped concave groove or a method of forming a concave groove by cutting a screw thread of a male screw with a cutter in another step after forging a screw screw with the above rolling die.
[0009]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-62934 (FIG. 1)
[0010]
[Problems to be solved by the invention]
By the way, in the method of forming a V-shaped concave groove by providing a vertical knurl in the middle of one rolling die as in the former, it was possible to provide a concave groove only on the screw thread, If you try to form a ditch deeper than the trough, you will have to deal with the transition of meat cost caused by forming a ditch in the trough, and you must solve this problem. For example, a screw screw with a deep groove deeper than the valley of the male screw cannot be forged.
[0011]
Further, the latter method requires a separate step of forming a concave groove, and there is a problem that the production efficiency is lowered and the cost is increased due to an increase in the number of steps.
[0012]
Accordingly, an object of the present invention is to solve the problem of transition of meat cost caused by forming a concave groove in the valley portion of the male screw, and the male screw without deforming the male screw thread in one step. A rolling die that can form a screw and a deep groove deeper than the valley of the male screw, and can produce a screw screw with a deep groove at a low cost, and a manufacturing method of a screw with a deep groove using this rolling die are provided. There is to do.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the invention of claim 1 is a rolling die for making a screw with a deep groove provided with a male screw on the outer periphery of a shaft portion and a deep groove intersecting with the male screw. The rolling dies consist of a combination of fixed dies and moving dies arranged opposite to each other, and the deep groove forming ridges with tight angles are spaced at regular intervals on each of the opposing rolling surfaces of the fixed and moving dies. Set both rolling surfaces from the front end to the rear end of the entrance side, and set the male thread temporary molding part, deep groove molding part, male thread main molding part, and male thread finish molding part sequentially. The male screw temporary forming portion has a height equal to or lower than the deep groove forming ridges at a position between the deep groove forming ridges, and is inclined at a gentle angle and extended in the inclined direction. The above-mentioned deep groove forming part Only the deep groove forming ridges are provided, and the male thread main molding portion is provided at a position between the deep groove forming ridges at a height lower than the deep groove forming ridges in the male thread temporary molding portion. The above-mentioned male thread finish molding part is provided with ridges that are inclined at an extension of the ridge, the width gradually increases toward the rear end, and is provided at regular intervals. Is inclined at the position between the deep groove forming ridges at a height lower than the deep groove forming ridges, as an extension of the ridges of the main molded portion, and the width gradually becomes wider toward the rear end. Male thread finishing ridges formed so as to be extended in the direction are provided at regular intervals, and in the male thread finish molding portion, male threads formed between the male thread finishing ridges. As the thread formation trough is located at the rear end, the width gradually becomes narrower. Gradually shallower toward the ones, in which those located between the end has adopted the configuration that has the same depth from the middle position.
[0014]
According to a second aspect of the present invention, in the first aspect of the invention, the deep groove forming portion includes a protrusion provided with a male screw temporary forming protrusion on the male screw temporary forming portion between the deep groove forming protrusions. The configuration is such that the strips are arranged in an elongated shape and are gradually lowered from the provisional molded portion of the male screw toward the main molded portion of the male screw.
[0015]
According to a third aspect of the present invention, in the second aspect of the present invention, the widths of the protrusions provided on the male screw temporary forming portion and the male screw temporary forming protrusions provided on the deep groove forming portion are respectively equal to the male screw. The structure set to the same width as the width of the deep groove forming part side tip of the protrusion provided in the main forming part is adopted.
[0016]
Here, the deep groove forming protrusions provided on the entire surface of the fixed die and the moving die are, for example, rolled over the entire surface of the rolling die at intervals such that two deep grooves are spirally formed with respect to the rivet under the screw. It is provided at an angle of about 20 ° with respect to the vertical direction of the die.
[0017]
Further, the protrusion of the male thread temporary forming portion has a tip end surface on a flat bottom surface between the deep groove forming protrusions, and the tip surface has a height equal to or lower than the deep groove forming protrusion. It is formed in a V-shaped projecting shape, set to the same height condition in the range of the temporary forming part, and by forming a V-shaped groove on the shaft part of the rivet under the screw, the meat allowance is reduced. Extrude to both sides in the axial direction.
[0018]
The protrusion of the main molded part of the male screw has a condition that the end on the entry side facing the deep groove formed part has the same width as the protrusion of the temporary formed part, and becomes wider toward the exit side. The groove is pushed out in the axial direction.
[0019]
The male thread finish projection provided on the male thread finish molding section is a trapezoidal projection with a flat surface with the same height as the projection of the main molding section, and the end on the entry side is the main molding section. The width of the rear end of the ridge is the same as that of the rear end of the protrusion, and the width of the rear end is gradually increased. The end is finished with a male thread.
[0020]
As described above, in the male screw temporary forming portion, the deep groove is formed in the shaft portion of the rivet by the deep groove forming protrusion, and at the same time, the V-shaped groove is formed by the protrusion provided between the deep groove forming protrusions. As a result, a V-shaped groove serving as a base for shifting the meat allowance for forming the male screw is formed at the same time. Therefore, in the main molded portion of the male screw, the protrusion for biting the male screw is bitten. In this case, the V-shaped groove serving as the base is formed in advance, and therefore, it is possible to effectively suppress the occurrence of resistance and impact when the protrusion is biting in the main molded portion of the male screw. Thus, the male screw can be formed smoothly.
[0021]
Further, the invention of the manufacturing method of claim 4 uses the rolling die according to any one of claims 1 to 3 described above, sandwiches a rivet under a screw with a fixed die and a moving die, and moves the moving die. By moving, by first pushing deep groove forming protrusions into the outer periphery of the circular shaft portion of the rivet in the male screw temporary forming portion, a plurality of deep grooves having a steep vertical direction are formed, and at the same time, there is a gap between the deep grooves. A groove corresponding to the inclination of the male screw is formed by a protrusion on the bulging part formed by transition of the margin, and then a deep groove is formed by pushing the deep groove forming protrusion into the deep groove having a sharp angle in the deep groove forming part. In the main molded part of the male screw, the groove is formed between the ridges by pushing the ridge for forming the deep groove into the deep groove with a steep angle while pushing the groove formed in the bulging part with the ridge. In the finish forming part of the male screw, While keeping the groove, the groove is moved deeper into the valley groove between the male thread forming ridges by pushing the groove in the axial direction with the male thread finishing ridges. The structure which forms the external thread parted by is adopted.
[0022]
In the temporary forming part of the male screw of the fixed die and the moving die, a plurality of grooves having a steep angle are formed by pushing the deep groove forming ridge against the shaft part of the rivet under the screw. The bulge of the shaft portion generated by the formation of the bulge is moved between the split grooves to form a bulge portion, and a groove corresponding to the inclination of the male screw is formed on the bulge portion, and the flesh margin at the bulge portion is formed. At the troughs between the ridges for male screw formation The male thread can be formed, and during the process of forming the male thread, the deep groove forming projection keeps the split groove, so that the male thread can be rolled without breaking the split groove. A screw screw with a deep groove in the male screw can be made.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
The rolling die 11 of the present invention comprises a combination of a fixed die 12 and a moving die 13 arranged opposite to each other, and each of the opposing rolling surfaces of the fixed die 12 and the moving die 13 has a tight angle over the entire surface. The deep groove forming ridges 14 are provided at regular intervals, and both rolling surfaces are directed from the front end to the rear end of the entry side, the male screw temporary forming portion A, the deep groove forming portion B, and the male screw main forming portion. C, set in the finish forming part D of the male screw in sequence, the patterns of the rolling surfaces of the dies 12 and 13 facing each other are symmetrical.
[0025]
The male screw temporary forming portion A has a V-shaped cross-section with a flat bottom surface between the deep groove forming ridges 14 and a tip that is the same height as the deep groove forming ridge 14 or a lower height and a narrow width. The ridges 15 are formed at regular intervals and are inclined at a gentle angle and are extended in the inclination direction.
[0026]
The deep groove forming portion B is provided with only the deep groove forming ridges 14 so that the space between the deep groove forming ridges 14 does not directly act on the shaft portion of the rivet 8 under the screw, As shown in FIG. 1, between the deep groove forming ridges 14, a male thread temporary forming ridge 15 a is an extended arrangement of the ridges 15 provided in the male thread temporary forming portion A. The provisional molding portion A can be provided so as to gradually become lower toward the main molding portion C of the male screw.
[0027]
The male thread main molding portion C is provided between the flat surfaces between the deep groove forming ridges 14 at a height lower than the deep groove forming ridges 14 on the male thread temporary forming portion A. The ridge 16 is formed into a V-shaped projection having a cross-sectional shape that is gradually widened toward the exit side. Is provided.
[0028]
In the case of FIG. 1, the provisional protrusion 15a of the deep groove forming portion B described above is wider than the protrusion 15 of the male screw temporary forming portion A. However, the provisional forming provided in the male screw temporary forming portion A is as follows. The width of the protrusion 15 and the provisional protrusion 15a of the deep groove forming portion B are the same width as the width of the inlet tip located on the deep groove forming portion side of the protrusion 16 provided on the main forming portion C of the male screw. You may make it set to.
[0029]
Further, the finish forming portion D of the male screw is inclined at the position between the deep groove forming ridges 14 at a height lower than the deep groove forming ridges 14 as an extension of the ridge 16 of the main forming portion C. , A protrusion having a trapezoidal cross-section having a flat surface having the same height as the protrusion 16 of the main molding portion C, the end on the entry side has the same width as the rear end of the protrusion 16 of the main molding portion C, and the rear The protrusions 17 for male thread finishing, which are formed so as to gradually increase in width toward the end and extend in the inclination direction, are provided at regular intervals.
[0030]
As shown in FIG. 3, a space between the male thread finishing ridges 17 becomes a V-shaped male thread forming valley groove 18, and the width of the ridge 17 of the finish forming portion D is gradually widened as it is located at the rear end. Therefore, the width of the male screw forming trough 18 is narrower as it is located at the rear end, and the rear end portion has a finished shape of a male screw.
[0031]
As shown in FIG. 2, the depth of the male thread forming trough 18 gradually becomes shallower toward the middle position at the first position, and the depth between the middle position and the end is the same. It has become.
[0032]
In this way, the male thread forming protrusions 15, 16, and 17 provided in the male thread temporary forming portion A, the main forming portion C, and the finish forming portion D are for deep groove formation so that they are arranged at regular intervals. Provided in a state of being combined with the protrusion 14, the protrusions 15, 16, and 17 for forming the male screw are set at an inclination angle and an interval so that a continuous male screw 6 can be formed. .
[0033]
The range of the male screw temporary forming portion A, main forming portion C, finish forming portion D and deep groove forming portion B provided on the rolling surface is, for example, the temporary forming portion A has three rotations of the shaft portion of the rivet under the screw, The deep groove forming portion B is set to make one rotation, the main forming portion C to four turns, and the finish forming portion D to make four rotations.
[0034]
Further, a tip forming portion 19 for rolling the sharp tip 3 on the shaft portion of the rivet 8 under the screw is provided at the lower portion of the facing surface of both rolling dies.
[0035]
Next, the manufacturing method of the screw screw with a deep groove using the rolling die of this invention is demonstrated.
[0036]
As shown in FIG. 4A, with the moving die 13 in the retracted position with respect to the fixed die 12, the shaft portion of the rivet 8 under the screw as shown in FIG. When the movable die 13 is moved in parallel with the fixed die 12 as shown in FIG. 4 (B), first, the screw thread is rotated between the male screw temporary forming portions A. By inserting the deep groove forming protrusion 14 into the outer periphery of the shaft portion of the rivet 8, a bulge in which the wall thickness is shifted between the deep grooves 7 and the deep grooves 7 having a steep angle as shown in FIG. A protruding portion 9 is formed, and the protruding portion bites into the protruding portion 9 to form a spiral groove 10 that matches the inclination of the male screw 6. To migrate.
[0037]
Next, when the shaft portion of the rivet 8 faces the deep groove forming portion B, the deep groove forming protrusion 14 is fitted into the deep groove 7 formed by the temporary forming portion A, thereby correcting and fixing the shape of the deep groove 7. .
[0038]
When the male thread temporary forming protrusion 15a is provided in the deep groove forming portion B, the above-described spiral groove 10 is pushed and widened by the temporary forming protrusion 15a.
[0039]
Subsequently, when the shaft portion of the rivet 8 enters the main molding portion C as the moving die 13 moves, the ridge 16 of the main molding portion C gradually becomes wider toward the exit side. 16 pushes the V-shaped groove 10 formed in advance in the bulging portion 9, thereby shifting the flare of the bulging portion 9 in the axial direction on both sides of the ridge 16. The deep groove forming protrusion 14 is fitted into the deep groove 7 to prevent the shape of the deep groove 7 from being broken.
[0040]
In this way, in the male thread temporary forming portion A, the deep groove 7 is formed in the shaft portion of the rivet 8 by the deep groove forming protrusion 14 and at the same time, the protrusion 15 provided between the deep groove forming protrusions 14 is V-shaped. By forming the groove 10, a V-shaped groove 10 is formed at the same time as a base for shifting the meat allowance for male screw formation. At the biting position of the protrusion 16 for formation, the V-shaped groove 10 serving as the base is formed in advance. For this reason, when the protrusion 16 bites in the main molded portion C of the male screw. The generation of resistance and impact can be effectively suppressed, and the male screw 6 can be formed smoothly.
[0041]
Next, when the shaft portion of the rivet 8 enters the finish forming portion D as the moving die 13 moves, the ribs of the finish forming portion D are widened in the axial direction on both sides to widen the groove width. .
[0042]
Since the protrusions 17 of the finish forming part have a trapezoidal flat surface, the meat allowance is pushed between the protrusions 17 by moving the grooves 10 formed in the main forming part C in the axial direction on both sides. The meat bill enters into the groove 18 formed between the two protrusions 17.
[0043]
Since the protrusion 17 of the finish forming portion D has a trapezoidal flat surface, the portion between the deep groove forming protrusions 14 in the shaft portion of the rivet 8 is formed into a circular shaft shape by the flat surface. Since the ridges 17 are gradually widened toward the exit side, and the grooves 18 between the ridges 17 are gradually narrowed toward the exit side, the meat allowance that is pushed and expanded in the axial direction by the ridges 17. Enters the groove 18 between the protrusions 17 and is formed into a helical male screw 6.
[0044]
In the process of forming the helical male screw 6 described above, the deep groove forming protrusions 14 are provided on the entire surfaces of both dies 12, 13, so that the temporary forming portion A, the main forming portion, and the finish forming portion D are used. When the male screw 6 is sequentially formed, the deep groove 7 is held by the deep groove forming protrusion 14, and therefore the shape of the deep groove 7 is not changed, and the male screw 6 is divided between the deep groove forming protrusions 14. The deep groove 7 is partially bitten with respect to the shaft portion finished with the protrusions 17.
[0045]
Accordingly, the male screw 6 can be formed while retaining the deep groove 7, and the male screw 6 is divided by the deep groove 7 as shown in FIG. Furthermore, the screw 1 provided with the deep groove 7 deeper than the thread root diameter can be manufactured in one step.
[0046]
【The invention's effect】
As described above, according to the present invention, each of the rolling surfaces facing each other of the fixed die and the moving die is provided with a ridge for forming a deep groove having a tight angle over the entire surface at a constant interval. From the front end to the rear end, the male screw temporary forming part, deep groove forming part, male screw main forming part, and male thread finishing forming part were set in order, so the first to the rivet shaft part By forming a deep groove in the bottom and retaining the shape to the end, the deep groove will not be crushed when the male screw is forged, and the protrusion provided in the male screw temporary molding part against the shaft part of the rivet By forming a concave groove between the deep grooves in the strip, the biting of the ridge in the main molding part of the next male screw starts from the concave groove part, so resistance and impact are generated when the ridge of the main molding part bites in. Smooth rolling the rivet shank. It is possible, it is possible to produce a deep groove with Sukuryuuneji highly accurate quality.
[0047]
Moreover, the screw screw with a deep groove can be manufactured in one process, and the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a front view showing a fixed die in a rolling die according to the present invention. FIG. 2 is a longitudinal front view of the fixed die. FIG. 3 is a perspective view showing a structure of a main part of the fixed die. Cross-sectional view of rivet under screw supplied to rolling die, (B) is a cross-sectional view of processed state of rivet under screw, (C) is a cross-sectional view of processed state of screw screw with deep groove (A) is a front view of a rivet under a screw used for manufacturing a screw screw with a deep groove, (B) is a front view of a deep groove formed on the same, and (C) is a front view of a screw screw with a deep groove. Enlarged cross-sectional view of screw screw with deep groove [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Screw screw 2 Head part 3 Tip 4 Shaft part 5 Blank part 6 Male screw 7 Deep groove 8 Rivet 9 Under screw 10 Groove part 10 Groove 11 Rolling die 12 Fixed die 13 Moving die 14 Deep groove forming ridge 15 ridge 16 Projection 17 Projection 18 Valley groove A Temporary molding part B of male thread Deep groove molding part C Main molding part D of male thread Finishing molding part of male thread

Claims

This is a rolling die for making a screw with a deep groove provided with a male screw and a deep groove intersecting this male screw on the outer periphery of the shaft, and this rolling die is composed of a fixed die and a moving die arranged opposite to each other. Each of the opposing rolling surfaces of the fixed die and the moving die is provided with a deep groove forming protrusion with a fixed angle over the entire surface at regular intervals. Set the male screw temporary molding part, deep groove molding part, male screw main molding part, male screw finish molding part in order toward the end, and the male screw temporary molding part is between each deep groove forming protrusion The deep groove forming portion is provided with protrusions having a height equal to or lower than that of the deep groove forming protrusion and inclined at a gentle angle and extending in the inclined direction at a constant interval. Is provided only with a deep groove forming ridge, the main molded part of the male thread is In the position between the deep groove forming ridges, the height of the ridge provided on the temporary forming part of the male screw is lower than the deep groove forming ridge, and the width gradually increases toward the rear end. Ridges formed so as to be extended in the inclined direction are provided at regular intervals, and the finish forming portion of the male screw is located at a position between the ridges for forming the deep grooves than the ridges for forming the deep grooves. The ridge for male thread finishing formed so as to incline into an extension of the ridge of the main molding part at a low height, the width gradually increases toward the rear end, and extends in the inclination direction is constant. The male thread forming troughs formed between the protrusions for finishing each male screw in the male thread finish forming portion are arranged at intervals, and the width is gradually narrowed toward the rear end, The depth is gradually deeper at the first position toward the middle position and ends at the middle position. Rolling die of the deep groove with the screw of which is located between have the same depth.

In the deep groove forming portion, between the deep groove forming ridges, the male thread temporary forming ridge is an extension of the ridge provided on the male screw temporary forming portion, and the male screw temporary forming portion The rolling die for a screw with a deep groove according to claim 1, which is provided so as to be gradually lowered toward the main molding portion of the male screw.

The width of the protrusion provided on the male screw temporary forming portion and the width of the male screw temporary forming protrusion provided on the deep groove forming portion is the same as that of the deep groove forming portion side of the protrusion provided on the main forming portion of the male screw. The rolling die for a deep groove screw according to claim 2, wherein the rolling die is set to have the same width as the tip.

Using the rolling die according to any one of claims 1 to 3, a rivet under a screw is sandwiched between a fixed die and a moving die, and by moving the moving die, first, a male screw is provided on the outer periphery of the circular shaft portion of the rivet. By pressing the deep groove forming ridges in the temporary forming part, a plurality of deep grooves in the vertical direction with a steep angle are formed, and at the same time, male ridges are formed on the bulging parts formed by shifting the metal bill between the deep grooves. Grooves that match the inclination of the screw are formed, and then in the deep groove forming section, the deep groove forming protrusion is pushed into the deep groove having a sharp angle to form the deep groove, and in the main forming section of the male screw, the sharp angle is formed. While pushing the groove for forming the deep groove into the deep groove, the groove formed in the bulging part is expanded with the protrusion, so that the bill of meat is transferred between the protrusions. While retaining the deep groove with the ridge, the groove is a ridge for male thread finishing. By pushing axially the valley groove between ridges of the male thread formed by shifting the meat allowance method of deep grooves with screw to form a male screw which is divided by a deep groove by the Tanimizo.