Abstract:
본발명은구멍주변에생성된버의형성방향과반대방향으로펀칭하여직경을확장시킴에따라구멍주변에형성된버가밀려올라가는동안구멍주변에형성된미세한결함들이크랙의시발점이되어두께방향으로파단이발생하게되는것을지연시키면서구멍의직경을확장시키도록하여기존공정에비해재료의구멍확장성비를획기적으로증가시킬수 있음은물론산업적으로재료를성형함에있어성형성을증가시킬수 있는판상재료의구멍확장방법에관한것이다. 이를위한본 발명의판상재료의구멍확장방법은, a) 판상재료에구멍을형성하는단계; 및 b) 펀칭공정으로제작된 구멍주변에생성된버의형성방향과구멍확장공정시 펀치가올라오는방향을반대로두고구멍을확장시킴에따라버가밀려올라가는동안구멍주변에형성된미세한결함들이크랙의시발점이되어두께방향으로파단이발생하게되는것을지연시키며상기구멍의직경을확장시키는단계;를포함하는판상재료의구멍확장방법;를포함한다.
Abstract:
생체 의료용 소재의 내부와 외부의 밀도가 상이하며, 상기 생체 의료용 소재는 타이타늄이고 기공을 가지는 것인, 생체 의료용 다공성 타이타늄 및 그의 제조방법이 제공된다. 본 발명에 따르면, 소망하는 밀도 및 기계적 특성를 제어하는 것이 가능하여 인체의 뼈를 대신하여 사용할 수 있는 인체에 무해한, 다공성 타이타늄을 제공할 수 있다.
Abstract:
The present invention relates to a method for obtaining a microstructure comprising the fine grain of a nanosize of 100nm or less, or the hyperfine of a submicro size by applying much shearing deformation to a tubular metallic material while passing the tubular metallic material through a path of a fixed shaped mold. The present invention has an effect for increasing the yield and costs of a process by achieving the target grain size while reducing the number of the process in comparison with a conventional method. According to the present invention, the method for manufacturing a microstructure comprises: a first shear deformation step for reducing a tube by passing a tubular metallic material through a mold which is broken at a fixed angle in a cross section; a second shear deformation step for expanding the tube by passing the tubular metallic material which is first shear deformed to a mold which is broken in a direction which is opposed to the first shear deformation step in a cross section; and a third shear deformation step for passing the tubular metallic material which is second shear deformed through the broken mold to be a form which is the same as an initial form.