SUCTION MANIFOLD

PURPOSE:To manufacture the suction manifold simply and with a large degree of freedom of a design without necessitating a bulge working process and a brazing process, etc., by forming a plenum chamber use tubular bulge part and a suction branch feed-out use tubular bulge part in a metallic clad sheet. CONSTITUTION:By printing a press-contact inhibitor in a necessary pattern on one face of one of two pieces of Al plates 10, and pressing the other Al plate 10 against this face, a clad sheet 2 having plural groups consisting of a non-press-contacting part for forming a plenum chamber use tubular bulge part and a non-press-contact part for forming a suction branch feed-out use tubular bulge part is made. Subsequently, by leading fluid pressure such as air pressure, etc., into the inside of both the bulge part forming use non-press-contact parts of this clad sheet 2 and the tubular bulge part forming use non-press-contact part which becomes a throttle body fitting use flange 5, they are brought to pre-tube expansion, and thereafter, cut to a necessary shape, brought to regular tube expansion, and a plenum chamber use tubular bulge part 3, a suction branch feed-out use tubular bulge part 3 and a throttle body fitting use flange use tubular bulge part 12 are formed. In the end, by widening the tubular bulge part 12 to the outside, and bending a non-press-contact part 11 to the outside, both the flanges 5, 6 are formed, and a suction manifold 1 is manufactured.