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Which of the following gating ratio represents pressurised gating systems?
- a)1 : 1 : 2
- b)1 : 2 : 1
- c)1 : 2 : 3
- d)1 : 3 : 3
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Which of the following gating ratio represents pressurised gating syst...
Gating ratio = Sprue area: Runner area: Ingate area
If total ingate area is not greater than the area of sprue, gating systems are known as pressurised gating system.
Option (a), (c) and (d) represents unpressurized gating system.
If total ingate area is not greater than the area of sprue, gating systems are known as pressurised gating system.
Option (a), (c) and (d) represents unpressurized gating system.
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Which of the following gating ratio represents pressurised gating syst...
Explanation:
Pressurised gating systems are used to avoid turbulence in the flow of molten metal. The gating ratio for pressurised gating systems is determined based on the cross-sectional areas of the pouring basin, sprue, and runner.
The correct gating ratio for pressurised gating systems is 1 : 2 : 1. This means that the cross-sectional area of the sprue should be twice that of the pouring basin and the cross-sectional area of the runner should be equal to that of the pouring basin.
The reasons for this gating ratio are:
1. Efficient flow of molten metal: The 1 : 2 : 1 gating ratio ensures that the molten metal flows efficiently from the pouring basin to the mould cavity without any turbulence. The larger cross-sectional area of the sprue allows the molten metal to flow smoothly and quickly, while the smaller cross-sectional area of the runner ensures that the molten metal flows at a controlled rate.
2. Reduced air entrainment: The pressurised gating system helps to reduce the amount of air entrained in the molten metal. This is because the pressure in the gating system prevents air from entering the system, and the efficient flow of metal reduces the amount of air that is trapped.
3. Reduced porosity: The pressurised gating system also helps to reduce the porosity in the casting. This is because the pressure in the gating system helps to compact the molten metal and reduce any voids or pockets in the casting.
In conclusion, the correct gating ratio for pressurised gating systems is 1 : 2 : 1, which ensures efficient flow of the molten metal, reduces air entrainment and porosity in the casting.
Pressurised gating systems are used to avoid turbulence in the flow of molten metal. The gating ratio for pressurised gating systems is determined based on the cross-sectional areas of the pouring basin, sprue, and runner.
The correct gating ratio for pressurised gating systems is 1 : 2 : 1. This means that the cross-sectional area of the sprue should be twice that of the pouring basin and the cross-sectional area of the runner should be equal to that of the pouring basin.
The reasons for this gating ratio are:
1. Efficient flow of molten metal: The 1 : 2 : 1 gating ratio ensures that the molten metal flows efficiently from the pouring basin to the mould cavity without any turbulence. The larger cross-sectional area of the sprue allows the molten metal to flow smoothly and quickly, while the smaller cross-sectional area of the runner ensures that the molten metal flows at a controlled rate.
2. Reduced air entrainment: The pressurised gating system helps to reduce the amount of air entrained in the molten metal. This is because the pressure in the gating system prevents air from entering the system, and the efficient flow of metal reduces the amount of air that is trapped.
3. Reduced porosity: The pressurised gating system also helps to reduce the porosity in the casting. This is because the pressure in the gating system helps to compact the molten metal and reduce any voids or pockets in the casting.
In conclusion, the correct gating ratio for pressurised gating systems is 1 : 2 : 1, which ensures efficient flow of the molten metal, reduces air entrainment and porosity in the casting.
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