Electric heating nozzle of hot chamber type die-casting machine

Abstract

Abstract PURPOSE:To achieve the prevention of the solidification of molten metal in nozzle orifice and its closing of the orifice by engraving continuous grooves on the outside surface of the nozzle and burying the electric heaters having the specific heat outputs in the respective continuous grooves on the sprue bushing side and injection pump side, respectively. CONSTITUTION:Long grooves 30 are engraved at an equal spacing in the lengthwise direction on the outside circumference of a cylindrical nozzle 10 and the both ends of the respective long grooves 30 are connected to the grooves 32 engraved in the circumferential direction of the nozzle 10. Next, heat-resistant electric insulation material 34 is filled in the grooves 30 and coil-form electric heaters 36 are buried therein. At the time, the heat output of the electric heaters 36 to be burined in the continuous grooves 30 positioned on the sprue bushing 28 side is set at 1.5-2.5 times the heat release quantity (the quantity of heat to be deprived by the mold 22) at the nozzle front part 54. On the other hand, the electric heaters 36 having the heat output approximately equal to the heat release quentity from the nozzle 10 rear part are buried in the continuous grooves 30 positioned on the injection pump 16 side.

Inventors

• 👤 Hiromi Nakamura
• 👤 Yasuo Sugiura

Bibliographic Details