In the design of die casting die with screw thread

the automatic screw thread unloading is a difficult point.A toothed rack is commonly adopted for the automatic screw rotational unloading.However

a new mechanism

mechanism of screw arbor with large helical angle

is adopted for automatically rotational screw thread unloading in the designed die casting die.The mechanism uses the open-die of die casting machine to provide the power for rotation of the core with screw thread

in which the mechanism of screw arbor with large helical angle changes the rectilinear movement of the open-die of die-casting machine to rotation of the core with screw thread

realizing the automatic screw thread unloading

which can improve the reliability of the production and save the die cost.