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Questions and Answers
Annealing is always required between dies to relieve work hardening.
False
Annealing is used to decrease ductility of stock.
False
Cleaning is done to increase the diameter of the starting end.
False
Pointing is done to increase the diameter of the starting end.
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Machining is a material addition process.
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Sharp corners and angles should be incorporated into product design to reduce stress concentrations.
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Generous fillets should be designed on outside corners to prevent hot tearing and cracks.
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In expendable mold casting, the purpose of draft is to aid in removal of the part from the mold.
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Sharp edges should be left unblended to increase the overall durability of the product.
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A draft angle of 1 degree is recommended for permanent mold casting processes.
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Hot tearing and cracks are a result of designing generous fillets on inside corners.
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Sharp corners and angles are not a source of stress concentrations in product design.
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In expendable mold casting, a draft angle of 1 degree Celsius is recommended.
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Similar tapers are allowed for hollow cores in expendable mold casting.
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The purpose of draft in permanent mold casting is to facilitate removal of the pattern from the mold.
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Study Notes
Annealing Process
- Used to relieve work hardening between dies.
- Increases material ductility, making it easier to shape.
Preparation of Work for Drawing
- Cleaning: Essential to protect the work surface and draw die from damage.
- Pointing: Involves reducing the diameter of the starting end to facilitate insertion into the draw die.
Design Considerations for Machining
- Avoid sharp corners and angles to minimize stress concentrations, which can lead to hot tearing and cracks.
- Incorporate generous fillets on inside corners; blend sharp edges to enhance the overall structural integrity.
Draft Guidelines in Casting
- In expendable mold casting, a draft angle of 1° is recommended to ease pattern removal from the mold.
- In permanent mold casting, a draft angle of 2° to 3° assists in the removal of parts from the mold.
- Allow similar tapers for designs utilizing solid cores to ensure effective mold utilization.
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Description
Learn about the importance of draft in mold casting, including its purpose in facilitating pattern removal and aiding in part removal from the mold. Discover the recommended draft angles for different types of casting processes.
