๓. Let it freeze
๓. ข้อดีและข้อเสียของกระบวนการหล่อโลหะ
Capabilities and Advantages of Casting
Can create complex part geometries
Can create both external and internal shapes
Some casting processes are net shape; others are near net shape
Can produce very large parts
Some casting methods are suited to mass production
Disadvantages of Casting
Different disadvantages for different casting processes:
— Limitations on mechanical properties
— Poor dimensional accuracy and surface finish for some processes; e.g., sand
casting
— Safety hazards to workers due to hot molten metals
— Environmental problems