Transcript Sand Casting - Bellwood Antis School District

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.
 Mold-
A cavity or opening in the sand
the size & shape of the desired item.
 Pattern-
The object placed in sand (then
removed) to form the cavity in the mold.
 Flask-
A two-piece container that holds
the sand mold in place for pouring.
 Cope-
The TOP half of the flask.
 Drag-
The BOTTOM half of the flask
 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
 Bench
Rammer
 Flask (2 pieces)
 Cope (top half)
 Drag (bottom half)
 Crucible Furnace
 Crucible
 Gate Cutter
 Bellows
 Sprue
& Riser
 Riddle
 Slick
& Oval
 Strikeoff Bar
 Trowell
 Parting Compound
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)
LIGHTLY sprinkle the board and
pattern with PARTING COMPOUND.
 (4)
Cover the pattern with 1” of FINELY
SIFTED SAND through the RIDDLE.
 (5)
PACK sifted 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 the COPE on 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 TROWEL and 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.