Metal joint body and apparatus for manufacturing the metal joint body
A miniaturized metal joint body and an apparatus for manufacturing the metal joint body to be improved about strength are provided. By cutting three overlapped metal sheets along a first cutting line and a pair of second cutting lines extending so as to intersect the first cutting line at each end of the first cutting line and pressing areas surrounded with the first cutting line and the pair of second cutting lines and each of a pair of bending lines connecting both ends of the pair of second cutting lines, each of the pairs of projecting members is formed so as to project in a pressing direction of arrow Z.
1 . A metal joint body, which is formed by joining two or more metal sheets to each other, comprising:
a pair of projecting members formed by cutting the, two or more overlapped metal sheets along a first cutting line and a pair of second cutting lines extending so as to intersect the first cutting line at each end of the first cutting line, and pressing areas surrounded with the first cutting line and the pair of second cutting lines and each of a pair of bending lines connecting both ends of the pair of second cutting lines so as to bend the each area about each of the bending lines and project the areas in a direction of pressing;
a hole formed by arranging the projecting members; and
a metal contact area arranged between an outer surrounding cutting surface of the projecting member arranged at a first metal sheet of the metal sheets located at a pressing side and an inner surrounding cutting surface of the hole arranged at a position to oppose to the outer surrounding cutting surface and arranged in a second metal sheet of the metal sheets overlapped on the first metal sheet and located at a far side from the pressing side.
2 . The metal joint body according to claim 1 , wherein widths of the projecting members and the holes along a direction parallel to the first cutting line are increasing toward the first cutting line.
3 . An apparatus for manufacturing a metal joint body by joining two or more metal sheets to each other, the apparatus comprising:
a first die having a press hole formed into a shape same as an area surrounded with a pair of second cutting lines intersecting a first cutting line at each end of the first cutting line and a pair of bending lines connecting both ends of the pair of second cutting lines, and the press hole being shallower from a bottom corresponding to the first cutting line toward each edge corresponding to the bending lines; and
a second die having a press projection formed to be fitted to the press hole and to be gradually narrower toward a top corresponding to the bottom of the press hole.