Sand Casting
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92 slides
Feb 25, 2015
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About This Presentation
This ppt is about one type of Casting called Sand Casting in Basic Manufacturing Process.This ppt covers almost everything about sand Casting.
Slide Content
1 SAND CASTING
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4 Sand , mixed with clay binder & water (so it will hold its shape) plus coal dust to improve surface finish Pattern (a copy of the shape you want to produce, made of wood, plastic or metal) Basic materials & equipment for sand-casting Container of molten metal (filled from furnace) Top and bottom mold forms (made of metal, open at top and bottom) Rammer (tool to compact the sand; often a pressing machine is used)
5 MOLDING : Sand placed into bottom mold form & compacted MOLDING : Pattern placed into mold Basic summary of the sand casting process. . . 2 1 THEN First of all, mix the sand .
6 MOLDING: Add the top mold form 3 4 MOLDING: Fill top form with compacted sand. A tube or pipe provides a path to pour the metal in Pattern is still inside!
7 MOLDING: Take the top mold off and remove pattern & pipe or post 5 6 MOLDING: Replace the top mold and fasten securely! Pouring hole In the middle of the sand is a cavity shaped like the pattern!
8 7 CASTING: Pour the metal (container is filled from furnace immediately before you are ready to pour) 8 Wait for the metal to cool (minutes to d ays, depending on the size of the casting)
9 8 SHAKE OUT: Break apart the two halves of the mold & take out the part—usually requires vibrating or striking the mold to break apart the sand CLEANING. Sand is cleaned off the part, the “tab” where metal flowed in must be removed. 9 A copy of the pattern has now been made in metal 10 Mold forms are reused 11 Sand is broken up, screened to remove debris and clumps, and sent for remixing
10 PATTERN & PATTERN MAKING
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34 PATTERN MAKING ALLOWANCES
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41 MOLDING SAND
42 Molding Sand Constituents
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45 Types of Molding Sand
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53 CORE & CORE MAKING
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66 SAND CONDITIONING
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80 Melting Furnaces
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82 Cupola
83 Construction of Cupola
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85 Zones in Cupola
86 Working of Cupola
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88 Electric Arc Furnace
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90 Induction Furnace
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