Success in micro nozzle mass production made of difficult-to-machine material

In general, high dimensional accuracy of a taper, curve design and smooth surface are required in small nozzles, especially the ones used in gasoline or diesel engines. Those nozzles directly inject fuel into the cylinder thus, the spray characteristics affect the fuel consumption or other performance directly. The optimum flow path design obtained from numerical calculations or other simulation is generally introduced, however, it is very difficult to realise the design in mass production. Moreover, if the nozzle diameter is less than 1 mm, it is difficult to mass produce even the simple straight hollow design due to the very shortcutting tool lifetime.
 
Realising the world's first 0.03 mm hole nozzle 17-4PH in MIM industry
Taisei Kogyo Co., Ltd. has realized mass production of micro nozzle, φ 0.03 mm with an aspect ratio of five. 0.03 mm is actually smaller than a standard hair diameter. It is said φ 0.05 mm is the smallest limit by machining at this moment. Their moulding and sintering technology using super fine metal powder, which cultivated as μ-MIM technology, realizes a dense smooth surface, the roughness of Ra = 0.3 without post-processing. In microfabrication like this nozzle, it is difficult to achieve this surface quality even with the latest laser processing technology due to the problem of dross deposits or residual thermal stress etc.

Contact: Izumi Nakamura, Taisei Kogyo Co.,Ltd
izumi_nakamura@taisei-kogyo-net.co.jp