Improvements in or relating to under sand frame moulding and pattern plate making suitable for above moulding method

摘要

659,691. Casting composite articles; patterns. FOUNDRY EQUIPMENT Ltd., and BEECH, A. S. Sept. 9, 1949, No. 23415. [Class 83 (i)] A pattern plate is cast within a collar-like frame one edge of which is flush with the parting face of the plate while the other extends behind the rear face of the plate. This hollow back is filled with concrete &c. A master pattern 1 is placed on a flat sand face 6 of a box 2, a box 5 is clamped thereon and packed with sand 3. The filled box 5 with the pattern 1 therein is reversed, a frame 9, Fig. 4, is placed thereon and aligned and clamped and is then packed with sand S. The filled frame 9 is removed, part spherical recesses 21, Fig. 10, are pressed in the sand face, a soft nail 22 is inserted obliquely at each recess and gits 25 are cut out. A rim 10 is applied to the frame 9 and the whole is inverted on to the filled box 5, without the pattern 1, but with runners 8 cut therein, and forms a mould as shown, for casting a lead-antimony alloy pattern plate 26 united to the frame 9. After casting, the sand S is broken out, the nails are bent and the frame is filled with cement which is allowed to harden. To make a pattern plate for the other side of the required article, the box 5, before removal of the pattern, and the filled frame 9, before forming the recesses 21, are used. A box 13, Fig. 6, is clamped on the box 5, rammed, and drawn by screws 17 and split nuts 15 held by tongs 14 and holes 19, Fig. 11, are cut in the sand 3a to receive tubes 28. Similarly a frame 20 is clamped to the frame 9, rammed and drawn and then holes 27, larger than 19, accommodate freely the tubes 28. Before assembling 13 and 20, recesses 21 are formed, nails 22 are inserted and a rim 10 fitted. After casting the second plate 30 the sand is replaced by cement as before. In use the cement frame for the cope or drag with pattern plate, e.g. 30, up is placed on the table 31, Fig. 12, of a moulding machine, pins 32 ensuring registration with false flask 33 and flask 34. Pins 41, for forming the gits, engage the tubes 28. When worn the rim 10 can be replaced.