Green Sand Control Equipment â Hot Compression Strength
Green Sand Control Equipment – Hot Compression Strength Scott M. Strobl Simpson Technologies Corporation
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Introduction • Are there methods that can better quantify molding sand properties to assist in the preparation of quality molds and defect free castings? • Standard green sand test are within specifications, yet we experience sand related problems. • Search for an illusive sand property – Hot compression strength (elevated temperatures)
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Agenda • High temperature compression strength test – Application to casting defects – Discuss test procedure and instrument – Review strength-deformation plot – Review some sand and process variables that can influence hot compression strength – Case study – hot compression strength • Muller / Mixer sand comparison – HCS and GCS AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
AFS Core and Mold Process Control • Elevated temperature sand properties – hot compressive strength - “Hot strength is more of a measure of the nature and quality of the clay present than any other factor.”
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
AFS – Casting Defects Hand Book References to molding sand strength and deformation
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Casting Defects • • • • •
Sand inclusions Swells Mold erosion Expansion defects Broken or cracked castings – Collapsibility
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
High Temperature Compression and Deformation Instrument
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Sample Preparation
2 in
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Hot Compression and Deformation Test Procedure
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Strength-Deformation Plot of a Molding Sand psi
Strength
Deformation
132.0
2.62
psi
% % def.
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Sand/process variables that can influence HCS • Clay Type – Sodium bentonite – Calcium bentonite
• MB Clay • Mulling – Sand preparation process
• Moisture • Compactability • Mold hardness
• • • • • •
Temperature AFS clay Carbon additives Cellulose additives Cereal additives Others
Influence can change with testing temperature AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
For additional information, please contact: • • • • •
Scott Strobl Simpson Technologies Corporation 751 Shoreline Drive, Aurora IL 60504 (630) 978 - 0044 [email protected]
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Introduction • Are there methods that can better quantify molding sand properties to assist in the preparation of quality molds and defect free castings? • Standard green sand test are within specifications, yet we experience sand related problems. • Search for an illusive sand property – Hot compression strength (elevated temperatures)
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Agenda • High temperature compression strength test – Application to casting defects – Discuss test procedure and instrument – Review strength-deformation plot – Review some sand and process variables that can influence hot compression strength – Case study – hot compression strength • Muller / Mixer sand comparison – HCS and GCS AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
AFS Core and Mold Process Control • Elevated temperature sand properties – hot compressive strength - “Hot strength is more of a measure of the nature and quality of the clay present than any other factor.”
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
AFS – Casting Defects Hand Book References to molding sand strength and deformation
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Casting Defects • • • • •
Sand inclusions Swells Mold erosion Expansion defects Broken or cracked castings – Collapsibility
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
High Temperature Compression and Deformation Instrument
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Sample Preparation
2 in
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Hot Compression and Deformation Test Procedure
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Strength-Deformation Plot of a Molding Sand psi
Strength
Deformation
132.0
2.62
psi
% % def.
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
Sand/process variables that can influence HCS • Clay Type – Sodium bentonite – Calcium bentonite
• MB Clay • Mulling – Sand preparation process
• Moisture • Compactability • Mold hardness
• • • • • •
Temperature AFS clay Carbon additives Cellulose additives Cereal additives Others
Influence can change with testing temperature AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
For additional information, please contact: • • • • •
Scott Strobl Simpson Technologies Corporation 751 Shoreline Drive, Aurora IL 60504 (630) 978 - 0044 [email protected]
AFS Sand Casting Conference October 20-22, 2014 – Indianapolis, IN USA
