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Investment Casting


GPI offers metal casting prototype services in a variety of materials including magnesium, aluminum, zinc, and bronze, which are created with a plaster, sand, investment or permanent molding process.


The Process

1. A master model is created
2. "Master Molds" are made from the master model
3. The "Master Molds" are used to generate plaster molds
4. Drying of mold (typically 3-5 days)
5. Metal is poured into the plaster mold
6. Cleaning and prepped for shipping or machining

Wax is injected into an aluminum die to produce a pattern that is an exact replica of the part to be produced.  For every casting, a wax pattern must be manufactured.  The patterns are clustered around a coated sprue and repeatedly dipped into an agitated vat of ceramic and allowed to dry.  After a shell thickness of approximately 3/16" has been built; the molds are dewaxed by either flash firing at high heat (1400 F.) or autoclaving (pressure and steam).  The hollow shells are then preheated to 800-2000 F. depending on the alloy to be poured and the molten metal cast immediately into the hot shell.  After cooling, the ceramic is vibrated and blasted off the metal parts and discarded.  The balance of the cleaning operations (cut off, grind, heat treat, straightening, blast) are straight forward and quite similar to the other casting processes.

NEW MATERIAL: B403 Mg Alloy

Low Alloy
Steels
Investment
Castings

Martensitic
Stainless Steel
Investment
Castings

Austentic
Stainless Steel
Investment
Castings

Duplex
Stainless Steel
Investment
Castings

Ferritic
Stainless Steel
Investment
Castings

Tool
Steel
Investment
Castings

1020 410 303 ASTM 890 Grade 4A 409 A2
1045 416 304, 304L   430 A6
1050 420 316, 316L   436 D2
1095 431 316 Non-Mag   446 D5
4130 15-5PH CF-8, CF-3     L6
4140 17-4PH CF-8M, CF3M     M2
4150 440A 330     M52
4340 440C 347     O1
6150 CA-6NM 20-CB3     S5
8620   Alloy 20, CN-7M     S7
8650   CF10-SMnN      


Copper Base Alloys
Investment
Castings

Nickel Base Alloys
Investment
Castings

Cobalt Base Alloys
Investment
Castings

Aluminum
Investment
Castings

CDA 872 NI-B CoAlloy 3 356
CDA 875 NI-C CoAlloy 6  
CDA 876 NI-X    
CDA 903 NI-625    
CDA 905 MONEL E    
CDA 954 NON GALLING    


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