Mechanical Engineering - Workshop Technology - Discussion
Discussion Forum : Workshop Technology - Section 4 (Q.No. 42)
42.
Which one of the following material will require the largest size of riser for the same size of casting?
Discussion:
21 comments Page 1 of 3.
Ajay Bhardwaj said:
5 years ago
We know that for maximum liquid shrinkage & solidification shrinkage the metal is "Aluminium". In question, it is asking that "which material will require the largest size of riser for the same casting" and also we know that function of the riser is to only compensate the liquid and solidification contraction and not solid contraction. Hence the Answer is "Aluminium" i.e. A.
Dinesh waghmare said:
9 years ago
Carbon steel experiences shrinkage of about 3% during solidification. Additional volume reduction occurs during the cooling of the liquid metal after pouring. These contractions will create internal unsoundness (ie, porosity) unless a riser, or liquid metal reservoir, provides liquid feed metal until the end of the solidification process.
Bhupi Dahiya said:
7 years ago
But what about solidification shrinkage. Stella has the highest shrinkage (liquid +solidification+solid).
And aluminium has highest in 1st two only (liquid and solidification).
And we all know that Riser is used to compensating for only 1st & 2nd.
So, Aluminium is the right answer.
And aluminium has highest in 1st two only (liquid and solidification).
And we all know that Riser is used to compensating for only 1st & 2nd.
So, Aluminium is the right answer.
Pratik Kurhekar said:
5 years ago
Here we are talking about riser.
Riser only compensates the shrinkage occurs in liquid and phase change ie solidification shrinkage. % of Al shrinkage is 6.6% which is higher than any other material mentioned above.
Answer must be ALUMINIUM.
Riser only compensates the shrinkage occurs in liquid and phase change ie solidification shrinkage. % of Al shrinkage is 6.6% which is higher than any other material mentioned above.
Answer must be ALUMINIUM.
(1)
Ashutosh verma said:
7 years ago
Steel is correct, aluminium is having largest liquid shrinkage, n steel has max total shrinkage, with a fact that riser is designed to compensate both LIQUID as well as SOLIDIFICATION shrinkages.
That's why we consider total shrinkage here.
That's why we consider total shrinkage here.
Akshay Patel said:
9 years ago
Aluminium is the right answer because riser is provided for liquid shrinkage and liquid shrinkage is more for Al than Steel. Steel has more shrinkage allowance for solid shrinkage than Al.
Mitesh morwal said:
8 years ago
Aluminium is the right answer because riser is provided for liquid shrinkage and liquid shrinkage is more for Al than Steel. Steel has more shrinkage allowance for solid shrinkage than Al.
ANKIT said:
1 decade ago
Aluminium is having largest liquid shrinkage and overall liquid & solid shrinkage is max for steel. But riser is used for compensation of liquid metal. So answer must be A.
Harshala said:
8 years ago
Out of all metals used in casting process Aluminium will be shrinking largest about 6% so during casting of the Aluminium size of riser required is largest.
Anand said:
5 years ago
Its aluminium, riser corresponds to liq shrinkage, so Al is the answer. Overall steel has highest when both solid +liq is considered.
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