Sand Casting. Bellwood-Antis Technology Education Department Bellwood-Antis High School Mr. Mackereth Mr. Crowell. SAND CASTING vs. OTHER CASTING METHODS. S and casting has THREE ADVANTAGES compared to other casting methods :
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Bellwood-Antis Technology Education Department
Bellwood-Antis High School
Mr. Mackereth Mr. Crowell
Sand casting has THREE ADVANTAGES
compared to other casting methods:
(1) Sand casting is easier for shop students to make high quality castings.
(2) The casting sand is reusable over and over again if properly maintained
(3) Sand casting is relatively inexpensive to make the casting molds.
Parting Compound-A very fine silica powder that allows for separation of the cope & drag when removing the pattern
Riser & Sprue-Vertical “tube” openings where metal is poured into the mold
Runners & Gates-Openings between pattern pieces in the mold providing a smooth path for the flow of molten metal
PLEASE REFER TO THE ATTACHED DIAGRAM IN YOUR NOTEBOOK
(1) Place the DRAG on a molding board UPSIDE DOWN (with pins pointing down)
(2) Place the PATTERN PIECE(S) down on the on the molding board.
(3) LIGHTLYsprinkle the board and pattern with PARTING COMPOUND.
(4) Cover the pattern with 1” of FINELY SIFTED SAND through the RIDDLE.
(5) PACKsifted sand around the pattern with a BENCH RAMMER. PACK FIRM!
(6) Place MORE SAND in the drag, and pack it FIRMLY with a bench rammer.
(7) When packed full to the top, clean off the sand with the STRIKEOFF TOOL.
(8) CAREFULLY flip the drag RIGHT SIDE UP on the bottom board.
(1) Place theCOPEon the top of the DRAG(line up the pins & holes.)
(2) Sprinkle PARTING COMPOUND LIGHTLY on the other side of the pattern.
(3) Insert the SPRUE and RISER tubes into the packed sand in the drag.
(4) Cover the pattern with at least 1” of finely sifted sand through the RIDDLE.
(5)CAREFULLY PACK sifted sand with bench rammer. Also pack around the sprue & riser.
CAUTION: DO NOT PACK THE COPE
TOO MUCH! It will sink the pattern pieces
down into the drag half of the mold
(6) Place more sand in the cope, and pack it firmly with the bench rammer.
(7) When packed to the top of the cope, clean off the sand with the STRIKEOFF TOOL.
(1) CAREFULLY remove the COPE and set it on its side off to the side. CAREFULLY ! ! !
(2) Cut GATES & RUNNERS (A COMPLETE PATH) through the sprue, pattern, & riser.
(3) MAKE SURE GATES / RUNNERS WILL GIVE YOU A GOOD FLOW!
(4) CAREFULLY remove the pattern from the DRAG half of the mold.
(5) Firm up any weak spots in the sand with the TROWELand the SLICK & OVAL.
(6) Blow away any loose sand with the BELLOWS & clean the edge of the drag.
(7) Make a FINAL CHECK of the mold & CAREFULLY place cope on top of drag.
(8) CAREFULLY set the mold on the floor. The teachers will pour at a later time.