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Shrinkage Porosity: A Guide to Correcting the Problems Shrinkage porosity is a void left in the solid casting due to the volumetric change that takes place during solidification of the molten alloy. All aspects of the die casting product life cycle affect shrinkage porosity. Although identifying and resolving shrinkage porosity defects is an important skill for a die caster, the most cost effective way to minimize shrinkage porosity is to design it out of the product as much as possible. This book describes how to detect shrinkage porosity and provides detailed methods to design the casting, the tooling, the gating, the die casting process, and the secondary processes to minimize and control shrinkage porosity.
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TABLE OF CONTENTS What is Shrinkage Porosity?.....................................1 Where Does Shrinkage Porosity Occur?......................2 Distinguishing Shrinkage Porosity and Gas Porosity.......3 Tests to Determine Shrinkage Versus Gas Porosity.......4 Avoiding Shrinkage Porosity.....................................5 A. Product Design.................................................5 B. Tool Design.......................................................7 C. Gate Design...................................................11 D. Process Control...............................................17 E. Secondary Processes........................................21 Conclusion...............................................23
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