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Ch33 surface roughness
1.
Chapter 33 Surface
Roughness and Measurement; Friction, Wear, and Lubrication Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
2.
Surface Structure of
Metals Figure 33.1 Schematic illustration of a cross-section of the surface structure of metals. The thickness of the individual layers depends on both processing conditions and processing environment. Source: After E. Rabinowicz and B. Bhushan. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
3.
Terminology and Symbols
Related to Surface Texture Figure 33.2 (a) Standard terminology and symbols used to describe surface finish. The quantities are given in μin. (b) Common surface lay symbols. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
4.
Surface-Roughness Figure 33.3
Coordinates used for surface-roughness measurement using Eqs. (33.1) and (33.2). ! Ra = a + b + c + d +K Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. n Rq = a 2 + b 2 + c 2 + d 2 +K n
5.
Manufacturing, Engineering &
Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. Surface Roughness Figure 33.4 (a) Measuring surface roughness with a stylus. The rider supports the stylus and guards against damage. (b) Path of the stylus in surface-roughness measurements (broken line) compared to the actual roughness profile. Note that the profile of the stylus path is smoother than that of the actual surface. (c) through (f) Typical surface profiles produced by various machining and surface-finishing processes. Note the difference between the vertical and horizontal scales.
6.
Real Contact Area
Figure 33.5 Schematic illustration of the interface of two bodies in contact showing real areas of contact at the asperities. In engineering surfaces, the ratio of the apparent-to-real areas of contact can be as high as 4 to 5 orders of magnitude. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
7.
Ring-Compression Test Figure
33.6 Ring-compression test between flat dies. (a) Effect of lubrication on type of ring-specimen barreling. (b) Test results: 1. original specimen and 2. to 4. increasing friction. Source: After A. T. Male and M. G. Cockcroft. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
8.
Manufacturing, Engineering &
Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. Friction Coefficient Chart Figure 33.7 Chart to determine friction coefficient from a ring-compression test. Reduction in height and change in internal diameter of the ring are measured; then μ is read directly from this chart. For example, if the ring specimen is reduced in height by 40% and its internal diameter decreases by 10%, the coefficient of friction is 0.10.
9.
Manufacturing, Engineering &
Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved. Worn Surfaces Figure 33.8 Changes in original (a) wire-brushed and (b) ground-surface profiles after wear. Source: After E. Wild and K. J. Mack
10.
Adhesive and Abrasive
Wear Figure 33.9 Schematic illustration of (a) two contracting asperities, (b) adhesion between two asperities, and (c) the formation of a wear particle. Figure 33.10 Schematic illustration of abrasive wear in sliding. Longitudinal scratches on a surface usually indicate abrasive wear. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
11.
Types of Wear
in Hot Forging Die Figure 33.11 Types of wear observed in a single die used for hot forging. Source: After T. A. Dean. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
12.
Lubrication Types Figure
33.12 Types of lubrication generally occurring in metalworking operations. Source: After W. R. D. Wilson. Manufacturing, Engineering & Technology, Fifth Edition, by Serope Kalpakjian and Steven R. Schmid. ISBN 0-13-148965-8. © 2006 Pearson Education, Inc., Upper Saddle River, NJ. All rights reserved.
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