Sand Casting - Bellwood Antis School District
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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.