In order to resolve the problems in over-long motion of loose core and difficulty to demould in gracile conical tube castings

a die casting die with a special mechanism of loose core-ejecting castings for long conical sleeve was designed. Processing characteristics of the sleeve was analyzed

and structure design and operation procedure of die casting die were described. A mechanism of angle pin and floating slider is adopted in the die

where the slider for loose core could not only move along direction of loose core

but also float along direction of ejecting casting. Firstly

the mechanism of angle pin and floating slider performs a short distance loose core

and then the ejector pins drive the slider and core along direction of ejecting casting

pushing the castings off the ejector die

which can greatly reduce the open-mould distance and decrease the equipment cost

improving product efficiency. The die exhibits compact in structure and reliable in operation. There exists no mark brought by ejecting casting

showing high product quality.