EBK MANUFACTURING ENGINEERING & TECHNOL
7th Edition
ISBN: 9780100793439
Author: KALPAKJIAN
Publisher: YUZU
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Chapter 34, Problem 28QTP
Estimate the plating thickness in electroplating a 20-mm solid-metal ball using a current of 10 A and a plating time of 1.5 h. Assume that c = 0.08 in Eq. (34.1).
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(a)
Figure 1 shows surface roughness and tolerances obtained in Chemical
Machining (CM) and Electrochemical Machining (ECM) process for different
types of electronic products.
Comment on the differences between chemical and electrochemical machining
process in terms of surface roughness and tolerance of the machined product as
illustrated in Figure 1.
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CM
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0.7
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0.6
0.5
0.4
0.3
0.2
0.1
Product A
Product B
Product C
Product D
Products
25
E ČM
20
Z ECM
15
10
Product A
Product B
Product C
Product D
Products
Figure 1: Surface roughness and tolerances of various electronic products
Surface roughness, Ra
Tolerance, (t mm x 10)
A part made of sheet steel is to be nickel plated. The part is a rectangular flat plate that is 0.075
cm thick and whose face dimensions are 14 cm by 19 cm. The plating operation is carried out in an
acid sulfate electrolyte, using a current = 20 amps for a duration = 30 min. Determine the average
thickness of the plated metal resulting from this operation. Assume, C= 3.42 x 102 mm/A-s, cathode
efficiency E = 95%.
G .l DO o e (iv) Dimensionless film thickness is greater 0 ) 0} ) Question 5: As the temperature is increased coefficient of friction based on the lubrcation regime. Question 6: Which of the following is a desir property of boundary lubricant? igh melting point.
Chapter 34 Solutions
EBK MANUFACTURING ENGINEERING & TECHNOL
Ch. 34 - Explain why surface treatments may be necessary...Ch. 34 - What is shot peening? Why is it performed?Ch. 34 - What are the advantages of roller burnishing?Ch. 34 - Explain the difference between case hardening and...Ch. 34 - Describe the principles of physical and chemical...Ch. 34 - Review Fig. 34.2 and describe the principles...Ch. 34 - Prob. 7RQCh. 34 - Prob. 8RQCh. 34 - Prob. 9RQCh. 34 - Prob. 10RQ
Ch. 34 - Prob. 11RQCh. 34 - Prob. 12RQCh. 34 - Prob. 13RQCh. 34 - Prob. 14RQCh. 34 - Prob. 15RQCh. 34 - Prob. 16RQCh. 34 - Describe how roller-burnishing processes induce...Ch. 34 - Explain why some parts may be coated with...Ch. 34 - Prob. 19QLPCh. 34 - Prob. 20QLPCh. 34 - Prob. 21QLPCh. 34 - It is well known that coatings may be removed or...Ch. 34 - Make a list of the coating processes described in...Ch. 34 - Sort the coating processes described in this...Ch. 34 - Why is galvanizing important for automotive-body...Ch. 34 - Explain the principles involved in various...Ch. 34 - Taking a simple example, such as the parts shown...Ch. 34 - Estimate the plating thickness in electroplating a...Ch. 34 - Which surface treatments are functional, and which...Ch. 34 - An artificial implant has a porous surface area...Ch. 34 - If one is interested in obtaining a textured...Ch. 34 - It is known that a mirrorlike surface finish can...Ch. 34 - It has been observed in practice that a thin layer...Ch. 34 - Prob. 34SDPCh. 34 - Prob. 35SDPCh. 34 - Because they evaporate, solvents and similar...Ch. 34 - Prob. 37SDPCh. 34 - The shot-peening process can be demonstrated with...Ch. 34 - Prob. 39SDPCh. 34 - Prob. 40SDP
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