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Assignment N3 - production run of 105-106 is envisaged 1...

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Ryerson University Department of Mechanical & Industrial Engineering Materials Selection for Engineering Design MTL 700 Assignment #3 Session: Fall 2011 Due on Tuesday, November 16, 2011 Exercise E1 Select processes for the elevator control quadrant that meat all design requirements listed in Table 1. What is the final choice between them? Explain why? Table1: Design requirements Exercise E2 Ceramic Tap Valve A ceramic valve consists of two disks mounted one above the other, spring-loaded so that their faces are in contact (Figure 2). For a hot water valve, zirconia is a good choice for material for the disks. Each disk has a diameter of 20 mm, a thickness of 5 mm and weighs about 10 g. In order to seal well, the mating surfaces of the two disks must be flat and smooth, requiring high 1 Material Class light metal Process Class primary; discrete Shape Class 3D-solid-transverse features Mass 5 kg Minimum Section 5 mm Precision 0.5 mm Surface Finish 10 μm Quality Level 8 or better Batch Size 100 Fig. 1: Elevator control quadrant
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levels of precision and surface finish; typically precision < 0.1 mm and surface finish < 1 μm. A
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Unformatted text preview: production run of 105-106 is envisaged. 1. List the function and constraints, leave the objective blank and enter “choice of process” for the free variable. 2. Use the charts of Chapter 7 to identify possible processes to make the casting Exercise E3 Use charts to select a joining process to meet the following requirements. 2 Figure 2: Ceramic Tap valve Exercise E4 (a), (b) and (c) Determine the shape-efficiency factor for strength limited design in bending, for the following three sections shown in Figure 3. (d) A beam of length L , loaded in bending, must support a specified bending moment M without failing and be as light as possible. Show that to minimize the mass of the beam per unit length, m/L , one should select a material and a section-shape to maximize the quantity: where σ f is the failure stress and ρ the density of the material of the beam, and is the shape-efficiency factor for failure in bending. 3 f B ϕ f B Figure 3...
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