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chandra_324_hw6_soln - Solution for ME324 HW#6 1 SOLUTION...

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Solution for ME324 HW #6 1 SOLUTION: In any extrusion process, there is some redundant work and friction work involved. In simple stretching, on the other hand, all of the work done goes into plastic deformation. Thus, for the same strain (same change in cross-sectional area), stretching (tension) requires the lowest force. 2 SOLUTION: If we extrude at lower temperatures given in Table 6.3, the flow stress will be higher and ductility will be reduced. If we extrude at higher temperatures, we risk greater oxide formation (resulting in poor surface finish) and less work hardening than that for lower temperatures. In either case, lubrication can be a problem and new lubricants may need to be prescribed. With variations in temperature, viscosity will change and lubricant performance may be altered. Also the Die wear will be affected by temperature and lubricant effectiveness. 3 SOLUTION: The major variables in the drawing processes are reduction in cross-sectional area, die angle, and friction. The drawing force can be reduced by (1) taking less reduction per
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