LIQUID PRESSURE FORMATION METHOD

摘要

PURPOSE:To enable the formation of a large-sized component as well by deforming the article to be formed which is pressed between the die having the recessed part for formation and a fold pressing plate along the dies recessed part by the pressure liquid to flow in from the aperture being provided on the pressing plate and by sealing the space between the article to be formed and the pressing plate. CONSTITUTION:A pressure liquid is flowed in from the pressure liquid inlet port 15 of a bed 12 simultaneously with pressing by a fastening power P the article 1 to be formed which is pinched between a die 14 and the fold pressing plate 13. The article 1 to be formed is then pushed up with passing this pressure liquid through the pressure liquid flowing in aperture of the plate 13 and deformed along the recessed part for formation of the die 14. In this case an annular groove is to be grooved on the plate 13 close by the outer peripheral part of the recessed part for formation and also the sealing stock consisting of an O ring 9 and backup ring 15 is to be fitted to this groove. The pressure liquid therefore acts only on the recessed part for formation without any leakage. In this case due to the area the pressure liquid affecting on being made minimum the press of big capacity is unnecessary and the formation of a large-sized component is possible as well with the constant fastening power of the press.