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 21RQ
What is the purpose of low-stress grinding?
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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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- 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.arrow_forward9-a- (iv) Which material is used make grinding wheel? Give reason?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_forward
- Explain any five characteristics of a grinding wheelarrow_forward5. Types of Grinding Wheel Machines and their outputs. (atleast 3)arrow_forwardA note States leave in minimum of .005" on all surfaces to allow for grinding after heat treat what should the size of a 2.000" diameter shaft be prior to heat treating?arrow_forward
- 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?arrow_forwardI want the theory part about Batch grinding in ball mill, its types, its Applications, advantages and disadvantages and els PLZ I want a perfect answer with detailsarrow_forwardWhich of the following grinding processes used in a highly productive form: a. Centerless grinding b. Superfinishing c. Surface grinding d. Internal grinding e. External cylindrical grindingarrow_forward
- 2) Write the application and advantages of Honing Process? 3) Briefly explain the working of a centerless grinding operation with a neat sketch?arrow_forwardQuestion is on photoarrow_forwardIn 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_forward
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