DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Chapter 28, Problem 24RQ
Why are centerless grinders so popular in industry compared to center-type grinders?
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c) 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?
Write the applications of bench grinding machines.
( type by Keyboard two pages at least )
11) An internal bore is ground to 100 mm, removing 0.3 mm stock. To accomplish
this, a grinding wheel 80% of the finished size is used. The wheel is dressed every
15 cycles because it is observed that the radial wheel wear is 0.05 mm on average.
Assume wheel and part widths are equal.
a. What dressing depth would you recommend and why?
b. Calculate the G-ratio of this operation.
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 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…arrow_forward13) 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).arrow_forward2) Write the application and advantages of Honing Process? 3) Briefly explain the working of a centerless grinding operation with a neat sketch?arrow_forward
- Talks about grinding, and Grinding Lathe Tool Bits. Explain properly.arrow_forwardManufacturers 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_forward2 Answer the following questions by circling True or False. 1. Open structures are used for precision forms and profile grinding. 2. In centre-less grinding operation, it is possible to grind cylindrical workpiece without actually fixing the workpiece using centres or a chuck. ( ) 3. Since all the machining parameters are built into the broach, very little skill is required from the operator. ( ) 4. The machined surface should be used as the clamping surface as it can improve the clamping stability. 5. During the measurement, a comparator is able to give the deviation of the dimension from the set dimension.arrow_forward
- Solve the math in a detailed wayarrow_forwardWhat are the three benefits of precision grinding?arrow_forwardIn a production turning operation, the workpart is 60 mm in diameter and 500 mm long. A feed of 0.75 mm/rev is used in the operation. If cutting speed-9 m/s, the tool must be changed every 4 workparts; But if cutting speed=5 m/s, the tool can be used to produce 50 pieces between tool changes. Determine the Taylor tool life equation for this job. (use the equations given below for solution) L Tm- 1,= Nf N AD, vT" = C %3| AD,L Tm fvarrow_forward
- Why Centerless Grinding machine uses two grinding wheels during grinding? Type your Answer here:-arrow_forwardWhy is it necessary to grind HSS lathe tool bits? What are the objectives in Grinding HSS Lathe Toolbits? Elaborate your answer and please make it typewritten.arrow_forwardPlease solve fast with correct answerarrow_forward
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