Draft angles, skrinkage allowance, section thickness, and sharpness of corners are amonh the issues that have...

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Mechanical Engineering

Draft angles, skrinkage allowance, section thickness, and sharpnessof corners are amonh the issues that have to be considered whendesigning a part to be made by casting. Discuss each of theseissues and its general significance in casting operations.

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By draft is meant the taper provided by the pattern maker on all vertical surfaces of the pattern so that it can be removed from the sand without tearing away the sides of the sand mold and without excessive rapping by the molder Draft Angle is an important requirement in the die casting process It is described as an angle or amount of slope that is incorporated into a wall of a die casting mold making the opening of the die cavity wider than its base It is also known as the draft Die casting molds with surfaces perpendicular to the direction of ejection can damage the product and the mold The metal formed will stick to the mold and an ejection by force and pressure causing an immeasurable damage Additional cost will be incurred to produce another mold if it is reusable Hence a small angle must be applied on all surfaces During the cooling process the castings will See Answer

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