A vertical true centrifugal casting process is used to produce bushings that are 250 mm long and 200 mm in outside diameter. If the rotational speed during solidification is 500 rev/min, determine the inside radii at the top and bottom of the bushing if R-2Rb. Take: 8-9.81 m/s

2. A 10-inch x 10-inch x 0.75-inch plate casting is produced with a steel alloy with p = 0.28 lb/in³ (= 7.75 g/cm³). Two third of the steel plate casting volume should be added more into the original one, and all molten metal should be poured in 10 seconds. The cylindrical, tapered sprue height is 4 inches. The sprue has a cylindrical base and is connected to two runners. Each runner with a square vertical cross-section is connected to two gates. The gate has a rectangular vertical cross-section, and its width is three times the height. 0.75 inch Cylindrical Square Rectangular sprue base gate runner Steel alloy casting Note that drawings are not to actual scale or ratios. Area of a sprue base's horizontal cross-section The ratio of the cylindrical sprue base's horizontal cross-sectional area to the sum of two runners' vertical cross-sectional areas to the sum of four gates' vertical cross-sectional areas is 1:2:3. The sum of areas of two runners' vertical cross-sections 1 2 Note that…

A riser in the shape of a sphere is to be designed for a sand casting mould at Simon Castings. The casting is a rectangular plate, with length = 400 mm, width = 250 mm, and thickness = 15 mm. If the total solidification time of the casting itself is known to be 7 min, determine the diameter of the riser so that it will take 30% longer for the riser to solidify.

B/ The sprue leading into the runner of a certain mold has a length is 150 mm. The cross- sectional area at base of the sprue is 400 mm². The mold cavity has a volume is 0.002 m². Determine: (a) the velocity of the molten metal flowing through the base of the sprue, (b) the volume rate of flow, and (c) the time required to fill the mold cavity.

A horizontal true centrifugal casting process is used to make lead pipe for chemical plants. The pipe has length = 0.5 m, outside diameter = 70 mm, and wall thickness = 6.0 mm. Determine the rotational speed that will provide a G-factor = 60. %3D

1. A horizontal true centrifugal casting process is used to make brass bushings with dimensions: L = 10 cm, outer diameter = 16 cm, and internal diameter = 12.5 cm. (a) Determine the required rotational speed to obtain a G-factor of 70. (b) When operating at this speed, what is the centrifugal force per square meter (Pa) imposed by the molten metal on the inside wall of the mold? (Density of Brass = 8.47 g/cm³)

EX.3//A cylindrical riser must be designed for a sand-casting mold. The casting itself is a steel rectangular plate with dimensions 7.5 cm x 12.5 cm x 2.0 cm. Previous observations have indicated that the total solidification time (TTs) for this casting =1.6 min. The cylinder for the riser will have a diameter-to-height ratio=1.0. Determine the dimensions of the riser so that its TTS = 2.0 min.

True centrifugal casting is performed horizontally to make large diameter copper tube sections. The tubes have a length = 2.0 m, outside diameter = 0.4 m, and wall thickness = 30 mm. (a) If the rotational speed of the pipe = 600 rev/min, determine the G-factor on the molten metal. (b) Is the rotational speed sufficient to avoid "rain?" (c) What volume of molten metal must be poured into the mould to make the casting if solidification shrinkage and contraction after solidification are considered? Solidification shrinkage for copper = 3.5%, and solid thermal contraction = 6.5%.

H.W: determine solidification time of cylinder casting, assuming that the radius is 6 cm and its height is 15 cm and the constant is 0.22sec lem.

A true centrifugal casting operation is to be performed in a horizontal configuration to make cast iron pipe sections. The sections will have a length = 105 cm, outside diameter = 20 cm, and wall thickness = 1.25 cm. If the rotational speed of the pipe = 500 rev/min, determine the G-factor. Is the operation likely to be successful?