Tomomi Shiratori

Micro Hole Piercing with a Slant Angle

Technologies of micro piercing with a slant angle have been developing for more than two decades. The technologies are used for the producing orifice plates, which is one of the most important parts for automobiles in terms of energy consumption and environmental issue. Orifice plate has 1 to 18 holes with slant angles from 0 (vertical) to over 45 degree. The orifices need to assure the flow volumes and spray angles of gasoline flow. To control the flow function, many characteristics, such as hole diameter, sheared surface, entrance condition, burr, hole angle and so on, are controlled by high accuracy punch and die with small clearance and precise positioning. As developing these technologies, progressive die system has developed. Different phenomena are observed between vertical and slant angled piercing in piercing force and material deformation.