4-1

Foundry Process

Green-Sand Molds

Skin-Dried Molds

Dry-Sand Molds

Loam Molds

Furan Molds

CO2 CO2

Metal Molds

Special Molds

4-2

Removable Patterns

Disposable PatternsPolystyrene

Bench Molding

Floor Molding

Pit Molding

Machine Molding

FlaskCopeDrag

Cheek

A

B

Parting SandSprue Pin

C

Polystyrene

4-3

Types of removable patterns

A.

B.

C.

Loose Piece

D.

E.

4-4

F.

G.

Pattern allowance

ShrinkageDraft

FinishDistortionShake

4-5

Disposable pattern

Pouring Basin

Sprue

Skimmer

Strainer

Riser

4-6

Blind Riser

Chills

Exothermic

Chemicals

4-7

SiO2

8~15%

Kaolinite IlliteBentonite

Synthetic Sand 3~5%

Aerate

Sand Mixer Simpson

4-8

ReclamationConditioning

Permeability

Strength

4-9

Referactoriness

Grain Size and Shape

15

61230405070100140200 270

270

6 00.0 3 0.0

12 00.0 5 0.0

20 00.0 10 0.0

30 02.0 20 40.0

40 02.5 30 75.0

50 03.0 40 120.0

70 06.0 50 300.0

100 20.0 70 1400.0

140 32.0 100 3200.0

4-10

200 12.0 140 1680.0

270 09.0 200 1800.0

04.0 30 1200.0

90.5 9815.0

9815/90.5=108

4-11

Caustic Soda

4-12

Sand Core

Green sand coreDry sand core

A

BCDEF

Core box

4-13

Chaplets

B C D E

F

Lineseed oil

DextrinGelatinized starch

PitchRosin

4-14

Furfuryl Alcohol

CO2

4-15

ScabRun-out

4-16

Jolt-Squeeze Rollover Machine

Jolt Rollover Pattern-Draw-Molding Machine

4-17

Sandslinger

Shake-out

4-18

Tumbling Mill

Wheelabrator Tumblast

Sandblast

GalvanizingPlating