GB1230634A - - Google Patents

Abstract

1,230,634. Core-making machines; core boxes. METALS & EQUIPMENT (WOLVERHAMPTON) Ltd. 13 May, 1969 [25 May, 1968], No. 25105/68. Heading B3F. A core-making machine has a multicavitied heated core-box having a centre part 13 and two co-operating outer parts 14, 15. A heat curable moulding material is blown into the core-box from a head 99. At each side of the sand blowing station is a core-box preparation and core extraction station to which the centre part of the core-box 13 is movable. Two core-box centre parts are employed so that while one is being prepared the other is under the sandblowing head. The core-box centre part 13 (Fig. 2) has Y- shaped core cavities 40 each with two mandrels 80. Slotted permanent magnets 43 are provided to hold metal spacers 30 (Fig. 8) for the cores. The spacers are loaded on the polepieces 27 of electromagnets on swinging doors 26 (Fig. 1) of the machine. The doors 26 are swung parallel with the cavity-containing sides of core-box parts 13 at the preparation station and the polepieces with the spacers 30 moved towards the part 13 to transfer the spacers to the permanent magnets. The electromagnets are deenergized and withdrawn, the mandrels 80 inserted into the cavities and the centre part moved beneath the blower head for core moulding.