test2--F09[1].pdf - Ndmm Ho barb erg Er l 1 I 6 ‘I o:1 q...

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Unformatted text preview: Ndmm Ho. barb erg Er l 1 I 6 ‘I o :1 q tfi/mo University of Missouri - CoiurnbiafKansas City Department of Mechanical and Aerospace Engineering Manufactm‘ing Methods Fall 2009 MAE 45 00 Midterm Exam #2 REMEMBER: Make engineering quality sketches Identify all coordinates and curves Use brief, clearly worded explanatory sentences. _______________________.__.__————-——-—-— 1. Copy the equilibrium diagram shown below (Fig. 1). (:1) Draw underneath the equilibrium diagram, another diagram to show the variation of distributed (micro) porosity, pipe, and total shrinkage (use projection lines to make the diagram accurate). (b) With the aid of sketches, show whether C1 or C2 has greater fluidity. (c) Make sketches showing the solidified structure for each composition in a cylindrical mold. (d) Underneath the above sketches show the probable macro segregation in the two alloys. (9) Draw a sketch of a sand casting mold for casting the part in Fig. 2. Show all the details of the metal supply system and other mold features to produce a sound part free of microporosity and shrinkage cavities. Fig. 1 Fig. 2 2. The airfoil of a turbine (Fig. 3) is isothermally hot forged of Ti-6A1-4V alloy at 900°C, on a hydraulic press of variable speed. Danger of deforming the hot die limits the die pressure p to 150MPa. The airfoil can be represented by a slab of 4mm thicknessx40nunx160mm, which is upset in the thickness direction, with a lubricant that assures u=0.1. Draw sketch of the process and then calculate, in a systematic manner, the process conditions for successful production. 0,13 txr’ice Fr Fri“ 5:5 Fr— 1'56- Fig. 3 3. The bronzeparts sho wninFiigure4s toebemad bypowder i-tzmetallmgyte clmiques. Des wiebeth sequenceofperatiml mneeddt finisehth partJMake aeoasktchf uitable die set,th hasure the bestunifonnityo oefd nsityduringc ompaction /////////////////////////////// % Note: All dimensions in mm. (a) A bolt is cold extruded from a bar of 30mm diameter. Make a sketch of the process. 10 [00 60° All dimensions in mm (b) The bolt in Problem (a) is found to have internal defects. What kind of defect would you expect to see? Suggest a remedy and justify. Use sketches to explain your answers. (0) The bolt produced is annealed to get good ductility without loosing the high strength obtained in cold working. Make diagrams showing the effects of cold working and annealing process on the properties of the produced bolt. . . 7 03.4%»: 3444‘“ 9144+, _. 3/7”“) . 94% 3+. .g‘Xga-re- m; IMJ __w.'H__ " ' "’I‘EPfl-h-“H Ae'hJfiu-iwis SW 30.. +4 slowm . mg; cw '- Mew ._ ; I ...
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