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Robust Design.

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Presentation on theme: "Robust Design."— Presentation transcript:

1 Robust Design

2 Deming’s 14 Points TABLE Deming’s fourteen points.

3 Available Shapes of Materials
TABLE Commercially available forms of materials.

4 Materials Selection Considerations
TABLE Approximate cost per unit volume for wrought metals and plastics relative to the cost of carbon steel. TABLE Typical scrap produced in various manufacturing processes.

5 Material Replacement FIGURE Advanced materials used on the Lockheed C-5A transport aircraft. (FRP is fiber-reinforced plastic.) TABLE Changes in materials from C-5A to C-5B military cargo aircraft.

6 Process Capability FIGURE Minimum part dimensions obtainable by various manufacturing processes. Source: After J.A. Schey.

7 Ashby Chart for Process Selection
FIGURE A plot of achievable dimensional tolerance versus surface roughness for various manufacturing operations; the dashed lines indicate cost factors. An increase in precision corresponding to the separation of two neighboring lines corresponds to a two-fold increase in cost. Source: M.F. Ashby, Materials Selection in Design, 3d ed., Butterworth-Heinemann, 2005.

8 Production Time vs. Surface Finish
FIGURE Relationship between relative manufacturing cost and dimensional tolerance. Note how rapidly cost increases as tolerance decreases.

9 Cost vs. Tolerance FIGURE Relative production time as a function of surface finish obtained by various manufacturing processes. See also Fig Source: American Machinist.

10 Material Applications
TABLE General applications of manufacturing processes for various metals and alloys.

11 Machinery Prices TABLE Approximate ranges of machinery base prices.

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