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A Design Study in Steel Castings - Steel Plates in BOP Valve                                        

The Molding Methods

Each of the three molding methods has relative capabilities, advantages, and costs, as shown in the table below. 

 

Target Shell-Mold Air-Set Sand Green Sand
As-cast dimensional tolerance across 1" +/- 0.060 +/- 0.030 +/- 0.060 +/- 0.060
Nominal surface finish (RMS) 500-900 300-500 500-900 500-900
Minimum Section Thickness 0.50 inch 0.25 inch 0.25 inch 0.25 inch
Intricacy of detail Fair Very Good Good Fair
Tool/Pattern Cost Low High Low Low
Mold Material Cost Low Medium Medium Low
Tool Lead Time Short Long Short Short

Given the as-cast tolerance and finish requirements, the level of detail, and the low cost driver for the insert plates, choose an appropriate molding method --
SHELL MOLD, AIR-SET SAND, GREEN SAND


Back

Choose a method

16

 

Copyright 2003  by the Steel Founders' Society of America   All rights reserved. 
Address comments to: blairr@sfsa.org
Last Modified:April, 2003 by STG

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