The component pictured in Figure CS-19 is a fuel-metering device for a large diesel engine. The long dimension of the part is approximately 6.3 cm (2 1/2 in.), and the width is 2.2 cm (7/8 in.). The large hole through the center is 0.93 cm (0.368 in.) in diameter, and the two small holes are tapped to accept 0.24 cm (3/32 in.) threaded bolts. All horizontal surfaces are parallel, and a realistic production run would be for about 20,000 identical pieces.
1. Consider the geometry of the piece and identify at least three possible means of producing the required shape. For each, discuss briefly the relative pros and cons.
2. If the part were to require mechanical properties of 380 MPa (55 ksi) tensile strength, a surface hardness of RB55, and an elongation of at least 1%, what types of materials would seem to be appropriate for this part?
3. Discuss the compatibility of the materials selected in Part 2 and the processes identified in Part 1. Are there any significant limitations?
4. What do you feel would be the best material-and-process solution from among the identified possibilities? For this solution, in what form would you purchase the starting material? Would a heat treatment be required to achieve the necessary final properties?

Transcribed Image Text:

FIGURE C$-19