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 2 of 3.
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.
Dinesh said:
8 years ago
Total shrinkage is more in steel.
Liquid shrinkage is more in aluminium.
Solid shrinkage more in brass.
Liquid shrinkage is more in aluminium.
Solid shrinkage more in brass.
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.
Himanshu Saini said:
9 years ago
Aluminium contraction rate in percentage is 1.8% and steel is 2% so answer is steel.
Tej said:
9 years ago
Aluminium has highest liquid shrinkage. And steel has highest ROYAL SHRINKAGE.
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.
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.
Rahul Urkude said:
10 years ago
Aluminium is the answer because shrinkage is more in aluminium and V of riser > 3 times V of casting.
SAGAR PATEL said:
10 years ago
Aluminium has shrinkage of 16 mm/m while steel has 20 mm/m, so I think steel is correct answer.
Don said:
1 decade ago
Shrinkage allowance steel is higher then aluminium. I think it is C.
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