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a. Differentiate between investment casting and continuous casting for the manufacture of cast metal alloys. Under...
Name a metal casting process that can be used to cast intricated jewellery products and describe...
Name a metal casting process that can be used to cast intricated jewellery products and describe major steps of the process with simple sketches
(Metal-Casting Processes) (Groups) 10.47 A round casting is 0.2 m in diameter and 0.75 m in...
(Metal-Casting Processes) (Groups) 10.47 A round casting is 0.2 m in diameter and 0.75 m in length. Another casting of the same metal is elliptical in cross-section, with a major-to-minor axis ratio of 2, and has the same length and cross-sectional area as the round casting. Both pieces are cast under the same conditions. What is the difference in the solidification times of the two castings? 10.48 A cylinder with a diameter of 50 mm and a height of 75...
A round casting is 0.2 m in diameter and 0.5 m in height (h). Another casting...
A round casting is 0.2 m in diameter and 0.5 m in height (h). Another casting of the same metal is elliptical in cross section, with a major-to-minor axis ratio (a/b) of 2, and has the same height and cross-sectional area as the round casting. Both pieces are cast under the same conditions. What is the difference in the solidification times of the two castings? Note: The surface area of the ellipse-based part is given by A=2pi*a*b+2pi*sqrroot(a^2+b^2)*h
this questions is wrong? how did come 26here ? Metal Casting Processes in A true centrifugal...
this questions is wrong? how did come 26here ?
Metal Casting Processes in A true centrifugal casting operation is to be performed horizontally to make copper tube sections with OD = 25 cm and ID = 22.5 cm. What rotational speed is required if a G- factor of 65 is used to cast the tubing? Solution: The inside diameter of the mold D=OD of the casting = 25 cm=0.25 m. We can compute the required rotational speed from Eq. (11.5)...
i need answer of questions from 11 to 30 1. Define manufacturing and list major manufacturing processes that are emp...
i need answer of questions from 11 to 30
1. Define manufacturing and list major manufacturing processes that are employed to manufacture the engineering materials 2. Why it is important to provide venting system for the escape of gases from the mold cavity? 3. What type of problems/defects can occur if mold material provides too much restraint to a solidifying and cooling liquid? 4. Sketch a gating system that is employed to manufacture metallic castings? 5. What is a draft...
1) Turbulence during pouring of the molten metal is undesirable since (two best answers): a) it...
1) Turbulence during pouring of the molten metal is undesirable since (two best answers): a) it causes discoloration of the mold surfaces, b) it dissolves the binder used to hold together the sand mold, c) it increases erosion of the mold surfaces, d) it increases the formation of metallic oxides that can become entrapped during solidification, e) it increases the mold filling time, and f) it increases total solidification time 2) Total solidification time is defined as a) time between...
Question C1. Give two (2) ways in which you can increase the yield strength of a metal and briefly explain how each...
Question C1. Give two (2) ways in which you can increase the yield strength of a metal and briefly explain how each works to increase the yield stress. Question C2. An aluminium-Silicon casting alloy has a composition that is close to the Al-Si eutectic composition. Give two reasons why this composition is used to cast aluminium based engine blocks Question C3. Describe briefly three (3) mechanisms by which short randomly aligned fibres add to the toughness of a composite. can...
Cast iron just like steel has wide applications. It is an alloy with carbon content in...
Cast iron just like steel has wide applications. It is an alloy with carbon content in excess of about 2%C (usually between 2.5 and 4.3%C) and Si content in excess of 0.5%. The microstructure of cast iron after solidification influences the final properties of the casting From the iron carbon phase diagram above answer the following questions: a) Calculate the volume fraction of ledeburite (eutectic component) present in the alloy containing 3%C after solidification under: i) equilibrium conditions ii) fully...
Question 33. Heat treatments are often performed on metal alloys in order to control their properties....
Question 33. Heat treatments are often performed on metal alloys in order to control their properties. (a) Briefly describe how heat treatments can affect the strength and ductility of metals. (2 Marks) (b) Wrought aluminium alloys often contain alloy constituents to improve various properties. 6xxx series aluminium alloys contain Magnesium and Silicon, which if present in appropriate concentrations, can form a hard intermetallic phase Mg2Si in the microstructure. Describe a suitable precipitation hardening heat treatment process for containing 0.5% Mg2Si...
Differentiate between Medicare and Medicaid. Who is covered under each plan? Who funds each plan?
Differentiate between Medicare and Medicaid. Who is covered under each plan? Who funds each plan?
(Metal-Casting Processes) (Groups) 10.47 A round casting is 0.2 m in diameter and 0.75 m in length. Another casting of the same metal is elliptical in cross-section, with a major-to-minor axis ratio of 2, and has the same length and cross-sectional area as the round casting. Both pieces are cast under the same conditions. What is the difference in the solidification times of the two castings? 10.48 A cylinder with a diameter of 50 mm and a height of 75...
this questions is wrong? how did come 26here ?
Metal Casting Processes in A true centrifugal casting operation is to be performed horizontally to make copper tube sections with OD = 25 cm and ID = 22.5 cm. What rotational speed is required if a G- factor of 65 is used to cast the tubing? Solution: The inside diameter of the mold D=OD of the casting = 25 cm=0.25 m. We can compute the required rotational speed from Eq. (11.5)...
i need answer of questions from 11 to 30
1. Define manufacturing and list major manufacturing processes that are employed to manufacture the engineering materials 2. Why it is important to provide venting system for the escape of gases from the mold cavity? 3. What type of problems/defects can occur if mold material provides too much restraint to a solidifying and cooling liquid? 4. Sketch a gating system that is employed to manufacture metallic castings? 5. What is a draft...
Question C1. Give two (2) ways in which you can increase the yield strength of a metal and briefly explain how each works to increase the yield stress. Question C2. An aluminium-Silicon casting alloy has a composition that is close to the Al-Si eutectic composition. Give two reasons why this composition is used to cast aluminium based engine blocks Question C3. Describe briefly three (3) mechanisms by which short randomly aligned fibres add to the toughness of a composite. can...
Cast iron just like steel has wide applications. It is an alloy with carbon content in excess of about 2%C (usually between 2.5 and 4.3%C) and Si content in excess of 0.5%. The microstructure of cast iron after solidification influences the final properties of the casting From the iron carbon phase diagram above answer the following questions: a) Calculate the volume fraction of ledeburite (eutectic component) present in the alloy containing 3%C after solidification under: i) equilibrium conditions ii) fully...
Question 33. Heat treatments are often performed on metal alloys in order to control their properties. (a) Briefly describe how heat treatments can affect the strength and ductility of metals. (2 Marks) (b) Wrought aluminium alloys often contain alloy constituents to improve various properties. 6xxx series aluminium alloys contain Magnesium and Silicon, which if present in appropriate concentrations, can form a hard intermetallic phase Mg2Si in the microstructure. Describe a suitable precipitation hardening heat treatment process for containing 0.5% Mg2Si...
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