Mechanical Engineering Exam > Mechanical Engineering Questions > The purpose of riser is toa)deliver molten me...
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The purpose of riser is to
- a)deliver molten metal into the mould cavity
- b)act as a reservoir for the molten metal
- c)feed the molten metal to the casting in order to compensate for the shrinkage
- d)deliver the molten metal from pouring basin to gate
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The purpose of riser is toa)deliver molten metal into the mould cavity...
To compensate for metal shrinkage during solidification, extra molten metal is stored in suitable location of the mould, which provides a supply of hot metal as the casting cools, this opening is called riser.
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The purpose of riser is toa)deliver molten metal into the mould cavity...
Riser in Casting Processes
Riser is an integral part of casting processes. It is a reservoir of molten metal that compensates for the shrinkage that occurs during solidification. This shrinkage can lead to various casting defects, such as porosity, shrinkage cavities, and cracks.
Purpose of Riser
The primary purpose of the riser is to feed the molten metal to the casting in order to compensate for the shrinkage. When the molten metal is poured into the mould cavity, it begins to solidify from the surface towards the centre. As the metal solidifies, it shrinks and creates a void or a cavity in the casting.
The riser compensates for this shrinkage by providing additional molten metal to the casting. The molten metal in the riser solidifies after the metal in the casting has solidified. This solidification of the riser provides an additional source of metal to compensate for the shrinkage in the casting.
Other Purposes of Riser
Apart from compensating for the shrinkage, the riser also serves other purposes in the casting processes. These include:
1. Acting as a reservoir for the molten metal: The riser acts as a reservoir for the molten metal and ensures that there is enough metal available to fill the mould cavity.
2. Providing a source of feeding: The riser provides a source of feeding to the casting by supplying additional molten metal.
3. Reducing the risk of defects: The riser reduces the risk of defects in the casting by compensating for the shrinkage and ensuring that the casting is filled with metal.
Conclusion
In summary, the primary purpose of the riser in casting processes is to compensate for the shrinkage that occurs during solidification. It provides additional molten metal to the casting to ensure that the casting is filled with metal and reduce the risk of defects.
Riser is an integral part of casting processes. It is a reservoir of molten metal that compensates for the shrinkage that occurs during solidification. This shrinkage can lead to various casting defects, such as porosity, shrinkage cavities, and cracks.
Purpose of Riser
The primary purpose of the riser is to feed the molten metal to the casting in order to compensate for the shrinkage. When the molten metal is poured into the mould cavity, it begins to solidify from the surface towards the centre. As the metal solidifies, it shrinks and creates a void or a cavity in the casting.
The riser compensates for this shrinkage by providing additional molten metal to the casting. The molten metal in the riser solidifies after the metal in the casting has solidified. This solidification of the riser provides an additional source of metal to compensate for the shrinkage in the casting.
Other Purposes of Riser
Apart from compensating for the shrinkage, the riser also serves other purposes in the casting processes. These include:
1. Acting as a reservoir for the molten metal: The riser acts as a reservoir for the molten metal and ensures that there is enough metal available to fill the mould cavity.
2. Providing a source of feeding: The riser provides a source of feeding to the casting by supplying additional molten metal.
3. Reducing the risk of defects: The riser reduces the risk of defects in the casting by compensating for the shrinkage and ensuring that the casting is filled with metal.
Conclusion
In summary, the primary purpose of the riser in casting processes is to compensate for the shrinkage that occurs during solidification. It provides additional molten metal to the casting to ensure that the casting is filled with metal and reduce the risk of defects.
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