PROBLEM TO BE SOLVED: To prevent crack of a protruded portion.SOLUTION: In an anchor 10, when forming an insertion-through hole 44 and a protruded portion 46, a through-hole is formed by pressing a steel plate from below to form a recess and punching a recess formation part in the steel plate from above. As a result, drooped faces are formed at both axial edges on a peripheral face of the through-hole, respectively, and sheared faces are formed axially inside of each drooped face on the peripheral face of the through-hole. The whole periphery of the through-hole of the steel plate is then pushed and opened to form the insertion-through hole 44 and the protruded portion 46 in the steel plate, while the drooped faces and the sheared faces inferior in face roughness exist at both axial ends on the peripheral face of the through-hole. The crack around the through-hole of the steel plate can be prevented during pushing and opening the whole periphery of the through-hole of the steel plate even when thickness of the steel plate is thin, and the crack of the protruded portion 46 can be prevented.

    【課題】突出部の割れを抑制する。【解決手段】アンカ10では、挿通孔44及び突出部46が形成される際に、鋼板が下方から押圧されて凹部が形成された後、鋼板の凹部形成部分が上方から打抜かれて貫通孔が形成されるため、貫通孔の周面の軸方向両縁にダレ面が形成されると共に、貫通孔の周面の各ダレ面より軸方向内側にせん断面が形成される。このため、その後、貫通孔の周面の軸方向両端部に面粗さが低いダレ面及びせん断面が存在する状態で、鋼板の貫通孔全周が押開かれて、鋼板に挿通孔44及び突出部46が形成される。これにより、鋼板の肉厚が薄い場合でも、鋼板の貫通孔全周が押開かれる際に鋼板の貫通孔周囲が割れることを抑制でき、突出部46の割れを抑制できる。【選択図】図3


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    Title :

    BELT MOUNTING TOOL AND METHOD OF MANUFACTURING BELT MOUNTING TOOL


    Additional title:

    ベルト取付具及びベルト取付具の製造方法


    Contributors:
    ITO TADAO (author)

    Publication date :

    2015-06-18


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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