DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 20, Problem 2P
Figure 20.A depicts the handles of two large wrenches, ratchet wrench and a pipe wrench. These components are traditionally forged from a ferrous alloy, or made from a cast steel or cast iron. For various reasons, alternative materials may be desired. The ratchet wrench is quite long, and reduced weight may be a reasonable desire. Both of these tools could be used in areas, such as a gas leak, where a non-sparking safety tool would be required. Current specifications for the ratchet handle call for a yield strength in excess of 50 ksi and a minimum of 2% elongation in all directions to ensure prevention of brittle fracture. The pipe wrench most likely has similar requirements.
FIGURE 20.A Handle segment of a large ratchet wrench and components of a pipe wrench.
- Could a plastic or composite material be used to make a quality product with these additional properties? (NOTE: Metal jaw inserts can be used in the pipe wrench, enabling the other components to be considered as separate pieces.)
- If so, how would you propose to manufacture the new handles?
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DeGarmo's Materials and Processes in Manufacturing
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