GB550595A - Dies for pressure casting - Google Patents

Abstract

550,595. Casting-machines. MADISON-KIPP CORPORATION. Aug. 19, 1941, No. 10555. Convention date, April 9. [Class 83 (i)] Cores.-A die for casting aluminium alloy pistons or other hollow articles comprises relatively movable mould parts 12, 22, Fig. 2, and one or more detachable core parts 59, 61 slidable on a core part 57, pivoted at 48<SP>1</SP> to a slide 42 which is moved automatically to position the core during the closing of the mould and to withdraw the core part 57 during the opening, the parts 59, 61 remaining in the casting. In the open position the central tapered core part 57 and its holder 48 can be swung by a handle 56 to make it accessible, as shown in Fig. 4, for the mounting of the parts 59, 61. The complete core is then swung into position' between the mould parts, a projection 51 on the slide 42 engaging a recess 52, and the part 22 is moved to the left by a hydraulic ram 15<SP>1</SP>. During this movement a cam 27<SP>1</SP> of an interchangeable fixed bar 27 engages a crank 45 of a gear 44 and advances the core until a pin 55 engages notches 53 in the holder 48 and slide 42, an inclined bar 36 engages a hole 361 in a slide 35 and advances a die part 33 between die parts 31, 32, and with them and the cores forms the mould cavity 40 and finally the fixed mould part 12 engages rods 21<SP>1</SP>, 191 to withdraw ejector rods 24 and a plate 19 carrying a rack 25, Fig. 2, which acts through a gear 41 and rack 39 to advance a core 38 into the cavity 30. Metal is then injected as described in Specification 481,829 upwardly into a passage 581 and annular gate 63 into the cavity 40. During the opening of the mould the core parts 59, 60 are stripped from but left inside the casting, the die 33 and core 37 are withdrawn, and finally the core 38 is withdrawn and the ejectors 24 operated, by the plates 19, 21 engaging an adjustable stop 17.