Manufactura
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Publicado: 5 de mayo de 2012
Solutions for Fundamentals of Modern Manufacturing, 3/e (published by Wiley) © MPGroover 2007
28 CLEANING AND SURFACE TREATMENTS
Review Questions
28.1
What are some of the important reasonswhy manufactured parts must be cleaned?
Answer. The reasons include (1) to prepare the surface for subsequent industrial processing, (2) to
improve hygiene conditions, (3) to remove contaminantswhich might chemically react with the
surface; and (4) to enhance product appearance and performance.
28.2
Mechanical surface treatments are often performed for reasons other than or in addition tocleaning.
What are the reasons?
Answer. Reasons for mechanical surface treatments include deburring, improving smoothness,
adding luster, and enhancing surface properties.
28.3
What are thebasic types of contaminants that must be cleaned from metallic surfaces in
manufacturing?
Answer. Basic contaminant types mentioned in the text are (1) oil and grease, (2) solid particles,
such asmetal chips, abrasive grits, shop dirt, and dust, (3) buffing and polishing compounds, and
(4) oxide films, rust, and scale.
28.4
Identify some of the mechanical cleaning methods.
Answer.Mechanical cleaning methods include blast finishing, shot peening, and mass finishing
(such as barrel tumbling). These methods also accomplish other functions such as deburring and
surface finishimprovement.
28.5
In addition to surface cleaning, what is the main function performed by shot peening?
Answer. Shot peening is primarily used to improve the fatigue strength of metals by introducingcold working the metallic surface.
28.6
Name some of the important chemical cleaning methods.
Answer. The chemical cleaning methods can be categorized as follows (1) alkaline cleaning, (2)emulsion cleaning, (3) solvent cleaning, (4) acid cleaning and pickling, and (5) ultrasonic cleaning.
28.7
What is meant by the term mass finishing?
Answer. In mass finishing, parts are...
28 CLEANING AND SURFACE TREATMENTS
Review Questions
28.1
What are some of the important reasonswhy manufactured parts must be cleaned?
Answer. The reasons include (1) to prepare the surface for subsequent industrial processing, (2) to
improve hygiene conditions, (3) to remove contaminantswhich might chemically react with the
surface; and (4) to enhance product appearance and performance.
28.2
Mechanical surface treatments are often performed for reasons other than or in addition tocleaning.
What are the reasons?
Answer. Reasons for mechanical surface treatments include deburring, improving smoothness,
adding luster, and enhancing surface properties.
28.3
What are thebasic types of contaminants that must be cleaned from metallic surfaces in
manufacturing?
Answer. Basic contaminant types mentioned in the text are (1) oil and grease, (2) solid particles,
such asmetal chips, abrasive grits, shop dirt, and dust, (3) buffing and polishing compounds, and
(4) oxide films, rust, and scale.
28.4
Identify some of the mechanical cleaning methods.
Answer.Mechanical cleaning methods include blast finishing, shot peening, and mass finishing
(such as barrel tumbling). These methods also accomplish other functions such as deburring and
surface finishimprovement.
28.5
In addition to surface cleaning, what is the main function performed by shot peening?
Answer. Shot peening is primarily used to improve the fatigue strength of metals by introducingcold working the metallic surface.
28.6
Name some of the important chemical cleaning methods.
Answer. The chemical cleaning methods can be categorized as follows (1) alkaline cleaning, (2)emulsion cleaning, (3) solvent cleaning, (4) acid cleaning and pickling, and (5) ultrasonic cleaning.
28.7
What is meant by the term mass finishing?
Answer. In mass finishing, parts are...
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