초록 ▼

A die casting apparatus for casting an article with an internally screw-threaded bore. The die casting apparatus includes a support, a die assembly coupled to the support, a core pin with external threads which are movable into and out of the die assembly, a lead screw for moving the core pin, a fix

A die casting apparatus for casting an article with an internally screw-threaded bore. The die casting apparatus includes a support, a die assembly coupled to the support, a core pin with external threads which are movable into and out of the die assembly, a lead screw for moving the core pin, a fixed bushing threadedly receiving the lead screw therein, a drive assembly, and a control assembly. The drive assembly has a hydraulic motor with an ouptut shaft that is axially arranged relative to the core pin for smoothly driving the core pin and lead screw. The external threads of the core pin and the external thread of the lead screw are identical for driving the core pin and the lead screw at the same rate to avoid damaging the newly formed internal threads of the cast article.

대표청구항 ▼

A die casting apparatus for casting an article with an internally screw-threaded bore, comprising: a support; a die, coupled to said support, having a first opening, a second opening and a cavity therein for receiving casting material through said first opening; a core pin having first and second en

A die casting apparatus for casting an article with an internally screw-threaded bore, comprising: a support; a die, coupled to said support, having a first opening, a second opening and a cavity therein for receiving casting material through said first opening; a core pin having first and second ends, said first end having external threads with a predetermined pitch thereon, said core pin being slidably coupled to said die for axial movement of said first end of said core pin into and out of said cavity via said second opening; driving means, coupled to said support and said core pin, for rotating and for moving aid core pin into and out of said cavity, said driving means including a movable member fixedly coupled to said core pin for axial movement therewith and having a first set of threads with a pitch identical to said pitch of said core pin threads, a stationary member having a second set of threads with a pitch identical to said pitch of said core pin threads and threadedly engaged with said first set of threads, and power means, coupled to said movable member, for rotating said movable member and said core pin relative to said stationary member and for moving said core pin into and out of said cavity; and control means, coupled to said support, for limiting axial movement of said core pin into and out of said cavity, said control means including a forward limit switch and a rearward limit switch, both rigidly coupled to said support, a forward switch assembly having a first link, pivotally coupled to said support, with a first end and a second end, said first end of said first link engagable with said movable member and said second end of said first link engagable with said forward limit switch to limit the movement of said core pin relative to said cavity, and a rearward switch assembly having a second link pivotally couple to said support, with a first end and a second end, said first end of said second link engagable with said movable member and said second end of said second link engagable with said rearward limit switch to limit the movement of said core pin relative to said cavity.