Degarmo's Materials And Processes In Manufacturing
13th Edition
ISBN: 9781119492825
Author: Black, J. Temple, Kohser, Ronald A., Author.
Publisher: Wiley,
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Chapter 28, Problem 3P
In grinding, both the wheel and workpiece are moving (or rotating). Using the data in Figure 28.11 and assuming that you are doing surface grinding (see Figure 28.1), what are some typical MRR values? How do these compare to MRR values for other machining processes, such as milling? What is the significance of this?
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13) Manufacturers are designing grinding spindles to turn at higher and higher speeds.
What is the main reason for this, and what is one drawback of increasing speed?
14) Name 2 reasons why cost increases as finish allowances decrease (See Figure
9.40).
In a surface grinding operation performed on a 6150 steel workpart (annealed,
approximately 200 BHN), the designation on the grinding wheel is C-24-D-5-V.
Wheel diameter =178 mm and its width= 25 mm. Rotational speed = 3000 rev/min.
Infeed = 0.05 mm per pass, crossfeed = 12.5 mm, and workpiece speed = 6 m/min.
This operation has been a source of trouble right from the beginning. The surface
finish is not as good as the 0.4 µm specified on the part print, and there are signs of
metallurgical damage on the surface. In addition, the wheel seems to become
clogged almost as soon as the operation begins. In short, nearly everything that can
go wrong with the job has gone wrong. (a) Determine the rate of metal removal
when the wheel is engaged in the work. (b) If the number of active grits per cm? =
30, determine the average chip length and the number of chips formed per time. (c)
What changes would you recommend in the grinding wheel to help solve the
problems encountered? Explain why you…
Explain why the same grinding wheel may act soft or hard.
Chapter 28 Solutions
Degarmo's Materials And Processes In Manufacturing
Ch. 28 - What are machining processes that use abrasive...Ch. 28 - What is attrition in an abrasive grit?Ch. 28 - Why is friability an important grit property?Ch. 28 - Explain the relationship between grit size and...Ch. 28 - Why is aluminum oxide used more frequently than...Ch. 28 - Why is CBN superior to silicon carbide as an...Ch. 28 - What materials commonly are used as bonding agents...Ch. 28 - Why is the grade of a bond in a grinding wheel...Ch. 28 - How does grade differ from structure in a grinding...Ch. 28 - Prob. 10RQ
Ch. 28 - How does loading differ from glazing?Ch. 28 - What is meant by the statement that grinding is a...Ch. 28 - What is accomplished in dressing a grinding wheel?Ch. 28 - How does abrasive machining differ from ordinary...Ch. 28 - Prob. 15RQCh. 28 - How is the feed of the workpiece controlled in...Ch. 28 - Why is grain spacing important in grinding wheels?Ch. 28 - Prob. 18RQCh. 28 - How does plunge-cut grinding compare to...Ch. 28 - Prob. 20RQCh. 28 - What is the purpose of low-stress grinding?Ch. 28 - How is low-stress grinding done compared to...Ch. 28 - Prob. 23RQCh. 28 - Why are centerless grinders so popular in industry...Ch. 28 - Explain how an SEM micrograph is made. Check the...Ch. 28 - Why are vacuum chucks and magnetic chucks widely...Ch. 28 - How does creep feed grinding differ from...Ch. 28 - Why does a lap not wear, even though it is softer...Ch. 28 - How do honing stones differ from grinding wheels?Ch. 28 - What is meant by charging a lap?Ch. 28 - Why is a honing head permitted to float in a hole...Ch. 28 - How does a coated abrasive differ from an abrasive...Ch. 28 - Why are the bottoms of chips shown in Figure 28.9...Ch. 28 - Prob. 34RQCh. 28 - What are the common causes of grinding accidents?Ch. 28 - What other machine tool does a surface grinder...Ch. 28 - Figure 28.11 showed residual stress distributions...Ch. 28 - In grinding, what is infeed versus cross feed?Ch. 28 - One of the problems with waterjet cutting is that...Ch. 28 - In AWC, what keeps the abrasive jet from machining...Ch. 28 - Prob. 1PCh. 28 - Explain why it is that a small particle of a...Ch. 28 - In grinding, both the wheel and workpiece are...
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- Manufacturers are designing grinding spindles to turn at higher and higher speeds. What is the main reason for this, and what is one drawback of increasing speed? Name 2 reasons why cost increases as finish allowances decrease. Tool temperatures are low at low cutting speeds and high at high cutting speeds, but low again at even higher cutting speeds. Explain why.arrow_forwardWrite the applications of bench grinding machines. ( type by Keyboard two pages at least )arrow_forwardRod Mills, Ball Mills and Autogenous Mills are different types of tumbling mills used in the metalliferous industry. What equipment, if any, usually accompanies each of these mills in grinding circuits and why.arrow_forward
- PLEASE SUMMARIZE IT IN YOUR WORDS!arrow_forwardWhy Centerless Grinding machine uses two grinding wheels during grinding? Type your Answer here:-arrow_forwardWhy are grinding operations necessary for parts that have been machined by other processes?c. Explain how the EDM process is capable of producing complex shapes.arrow_forward
- Make a list about the process of Mechanical Grinding and another of Reactive Grinding, please be clear in your writing (preferably in digital format) and consider all the corresponding stepsarrow_forwardSubject: Manufacturing Processes Please do all partsarrow_forward27) (a) Grinding wheel manufacturer has written the following information"W A 46 B 5 E 17" on the grinding wheel. Explain (b) Sketch and explain the centerless grinding. (c) Neatly sketch and define reaming and countersinking operationarrow_forward
- i need the answer quicklyarrow_forwardc) It is planned to carry out the grinding operation using a grinding wheel of diameter 15 cm and width 2 cm, and using successive depths of cut of 0.02 mm, with two final cuts of 0.01 mm each. Wheel speed is 1450 m/min, work speed is 0.25 m/s and the cross feed is 0.4 mm. The number of active grits per area of the wheel surface is 0.75 grits/mm? with a grain aspect ratio of 20. i) Determine the Material Removal Rates for both depths of cut. ii) If the cycle time for one forward/return stroke of the work during grinding is 5 sec., estimate the total time taken to complete the job. ii) Considering a constant of proportionality K2 of 40,000, determine the maximum surface temperature of the work. iv) What recommendations would you give to reduce any surface damage owing to high work temperatures?arrow_forward(Grinding) (SI units) Wheel diameter = 160 mm, and infeed = 0.03 mm in a surface grinding operation. Wheel speed = 1500 m/min, work speed = 0.25 m/s, and crossfeed = 4 mm. The number of active grits per area of wheel surface = 35 grits/cm2. When the wheel is engaged in the work, determine: a. average length per chip, b. metal removal rate, and c. number of chips formed per unit time for the portion of the operationarrow_forward
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