Figure CS-14 presents a cut-away sketch of the moveable and fixed jaw pieces of a heavy-duty vise that might see use in vocational schools, factories and machine shops. The vise is intended to have a rated maximum clamping force of 15 tons. The slide of the moving jaw has been designed to be a 2-in. box channel. The jaw width is 5 in., the maximum jaw opening is 6 in., and the depth of the throat is 4 in. The designer has elected to use replaceable, serrated jaws, and suggests that the material used for the receiving jaw pieces have a yield strength in excess of 35 ksi, with at least 15% elongation in a uniaxial tensile test (to assure that an overload or hammer impact would not produce brittle fracture).
1. Determine some possible combinations of material and process that could fabricate the desired shapes with the required properties. Of the alternatives presented, which would you prefer and why?
2. Would the components require some form of subsequent heat treatment? Consider the possibilities of stress relief, homogenization, or the establishment of desired final properties. What would you recommend?
3. One of your colleagues has suggested that the slides be finished with a coat of paint. Do you think a surface treatment is necessary or desirable for your selected material and process? If so, what would you recommend? If not, is a different surface treatment preferred, and what might that be?

Transcribed Image Text:

Replaceable jaws Movable jaw piece Fixed jaw piece Slide Note: shaded surfaces have been produced by cross-sectional cuts FIGURE CS-14