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Questions and Answers
What is the main difference between die casting and permanent mould casting?
What is the main difference between die casting and permanent mould casting?
- Permanent mould casting involves high velocity filling induced by pressure, while die casting depends on gravity for mould filling
- Die casting produces shapes with less complexity than permanent mould casting
- Die casting uses permanent metal moulds, while permanent mould casting uses reusable metal moulds
- Die casting involves metal flow at high velocities induced by pressure, while permanent mould casting depends on gravity for mould filling (correct)
What happens after the die has been closed and locked in the die casting process?
What happens after the die has been closed and locked in the die casting process?
- Molten metal is delivered to a pump/plunger (correct)
- The metal solidifies without any further processing
- The die is immediately opened to check the casting
- The overflow wells are emptied to remove excess metal
What is done while the casting die is open in the die casting process?
What is done while the casting die is open in the die casting process?
- Pressure is applied to the remaining metal
- The die is cleaned and lubricated as required (correct)
- The molten metal is poured into the die cavities
- The air in the die escapes through vents
What allows die casting to produce more complex shapes than permanent mould casting?
What allows die casting to produce more complex shapes than permanent mould casting?
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What happens during the specified dwell time in the die casting process?
What happens during the specified dwell time in the die casting process?
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Study Notes
Die Casting vs Permanent Mould Casting
- Die casting allows for more complex shapes due to the application of high pressure (up to 45000 psi) and speed
- Permanent mould casting has limitations in producing complex shapes due to low pressure and gravity pouring
Die Casting Process
- After the die has been closed and locked, molten metal is injected into the casting die under high pressure
- The die is held closed by a strong clamp or toggle mechanism
During Die Open
- The die is opened, and the shot sleeve is withdrawn
- The casting is ejected from the die cavity
- The die is lubricated and prepared for the next shot
Die Casting Advantages
- The high pressure and speed of die casting allow for the creation of complex shapes with thin walls and intricate details
- The metal is rapidly solidified, resulting in a stronger and more consistent product
Dwell Time
- During the specified dwell time, the molten metal is allowed to solidify in the die cavity
- The dwell time is critical in achieving the desired properties of the final product
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Description
Learn about the production process of die castings, which involves forcing molten metal into metal moulds under pressure. Understand the differences between die casting and permanent mould casting, and how they relate to each other.
