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The contraction allowance provided on the pattern and core boxes compensates for the following type of contraction
[ME 1988]
- a)liquid contraction
- b)solidification contraction
- c)solid contraction
- d)All of the above three types of contractions
Correct answer is option 'C'. Can you explain this answer?
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The contraction allowance provided on the pattern and core boxes compe...
Third stage of contraction solidification contraction compensated by pattern allowances.
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The contraction allowance provided on the pattern and core boxes compe...
Contraction Allowance on Pattern and Core Boxes
The contraction allowance provided on the pattern and core boxes compensates for solid contraction.
Explanation:
When a casting is made, the molten metal is poured into a mold cavity. As the metal cools down and solidifies, it undergoes a reduction in volume due to the contraction of the material. This contraction can cause various defects in the casting, such as shrinkage, porosity, and distortion. To compensate for these contractions, a pattern is used to create the mold cavity, and a core is used to create internal features of the casting.
Pattern Contraction Allowance:
The pattern is a replica of the final casting and is used to create the mold cavity. The pattern is made slightly larger than the desired size of the casting to account for the solid contraction that occurs during cooling. This additional size is known as the contraction allowance. The pattern maker determines the contraction allowance based on the material being cast and its cooling characteristics. By providing a larger pattern, the final casting will have the desired dimensions after solid contraction occurs.
Core Contraction Allowance:
In some castings, internal features such as holes, recesses, or cavities are required. These features are created using cores, which are made of sand or other materials and are placed within the mold cavity. Similar to the pattern, cores also undergo solid contraction during cooling. Therefore, a contraction allowance is provided on the core boxes to account for this contraction. The core boxes are made slightly larger than the desired size of the core to ensure that the final casting has the correct dimensions after solid contraction.
Conclusion:
The contraction allowance provided on the pattern and core boxes compensates for the solid contraction that occurs during the cooling and solidification of the molten metal. By incorporating this allowance, the final casting can achieve the desired dimensions and avoid defects caused by contraction.
The contraction allowance provided on the pattern and core boxes compensates for solid contraction.
Explanation:
When a casting is made, the molten metal is poured into a mold cavity. As the metal cools down and solidifies, it undergoes a reduction in volume due to the contraction of the material. This contraction can cause various defects in the casting, such as shrinkage, porosity, and distortion. To compensate for these contractions, a pattern is used to create the mold cavity, and a core is used to create internal features of the casting.
Pattern Contraction Allowance:
The pattern is a replica of the final casting and is used to create the mold cavity. The pattern is made slightly larger than the desired size of the casting to account for the solid contraction that occurs during cooling. This additional size is known as the contraction allowance. The pattern maker determines the contraction allowance based on the material being cast and its cooling characteristics. By providing a larger pattern, the final casting will have the desired dimensions after solid contraction occurs.
Core Contraction Allowance:
In some castings, internal features such as holes, recesses, or cavities are required. These features are created using cores, which are made of sand or other materials and are placed within the mold cavity. Similar to the pattern, cores also undergo solid contraction during cooling. Therefore, a contraction allowance is provided on the core boxes to account for this contraction. The core boxes are made slightly larger than the desired size of the core to ensure that the final casting has the correct dimensions after solid contraction.
Conclusion:
The contraction allowance provided on the pattern and core boxes compensates for the solid contraction that occurs during the cooling and solidification of the molten metal. By incorporating this allowance, the final casting can achieve the desired dimensions and avoid defects caused by contraction.
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The contraction allowance provided on the pattern and core boxes compensates for the following type of contraction[ME 1988]a)liquid contractionb)solidification contractionc)solid contractiond)All of the above three types of contractionsCorrect answer is option 'C'. Can you explain this answer?
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