Answered: rsely proportional to the specific…

Engineering

Mechanical Engineering

rsely proportional to the specific heat of the cast material (c) Inversely proportio

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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(c) A square casting has a volume and surface area equal to 1000 mm³ and 600 mm² respectively, and a cylindrical riser through which the molten metal is poured has a volume and surface area equal to 282 mm³ and 244 mm² respectively. Using Chvorinov's rule, determine whether such a design would avoid shrinkage cavities.
2) The region showing planar growth during solidification near the fusion zone boundary will exhibit O High temperature gradient and high growth rate High temperature gradient and low growth rate Low temperature gradient and high growth rate O Low temperature gradient and low growth rate
(a) Which variables affect the total solidification time for casting process? Justify your answer from a suitable equation. Q3 What are the factors that affecting the freezing rate during solidification of the molten metal and evaluate why nearly all metals experience shrinkage during solidification process.
In casting experiments performed during a certain alloy and type of sand mould it took 155 second for a cube shaped casting to solidify. The cube was 50 mm on a side. (i) Determine the value of the mould constant in Chvorinov's Rule. (ii) If the same alloy and mould type were used, find the total solidification time for cylindrical casting in which the diameter D = 30 mm and length L = 50 mm. %3D
1. A square section riser be designed for a sand-casting mold. The casting itself is a quarter-cylinder with a diameter of 12cm and a length 20cm. The total solidification time for this casting 0.9 min. The square for the riser will have a height-to-width ratio of 2.0. Determine the dimensions of the riser so that it is total solidification time = 1.2 min. %3D %3D
4. Riser (a) What is the purpose of a riser in sand casting? (b) What are the design parameters for a riser, and what are the design constraints that you need to satisfy given your answer in (a)? (c). Assuming you are using a sand casting process, use an example to show the appropriate relationships between the design parameters for your riser that result in the longest solidification time.
Please show all of your work, thank you!
8
Please show all of your work, thank you!
Pouring Calculations A mold sprue is 25 cm long, and the cross-sectional area at its base is 3.0 cm2. The sprue feeds a horizontal runner leading into a mold cavity whose volume is 1700 cm3. Determine: (a) velocity of the molten metal at the base of the sprue, (b) volume rate of flow, and (c) time to fill the mold. (The acceleration of gravity g = 981 cm/s2) use cm keep all unit in cm
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Problem 1. Chapter 10 Pouring Calculations A mold sprue is 25 cm long, and the cross-sectional area at its base is 3.0 cm². The sprue feeds a horizontal runner leading into a mold cavity whose volume is 1700 cm³. Determine: (a) velocity of the molten metal at the base of the sprue, (b) volume rate of flow, and (c) time to fill the mold. (The acceleration of gravity g = 981 cm/s²)