DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 24, Problem 8RQ
Why does down milling dull the cutter more rapidly than up milling when machining sand castings?
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10. Casting problem
A certain mold has a sprue whose length is 20 cm and the cross-sectional area at the base of the sprue
is 2.5 cm?. The sprue feeds a horizontal runner leading into a mold cavity whose volume is 1560 cm³.
Determine: (a) velocity of the molten metal at the base of the sprue, (b) volume rate of flow, and (c)
time to fill the mold (in second).
mfg m1 Spring 2020 999.pptx
The tailstock has tow major part a bottom casting and a top casting.The bottom casting is machined very accurately to fit the ways of the lathe (a) dogs (b)bed (c) carriage (d)mandrel
04
05
a Explain the reasons for the following:
1- The pure aluminum and the copper are generally rated as easy to
machine
2- In ultrasonic machining, the stress produced by the impact of abrasive
particles on the workpiece surface is high.
3- In rolling process, the coefficient of friction must be sufficient.
4- Difference in solidification between casting and welding processes.
5- Why is it desirable to use energy sources for welding that have high heat
densities?
6- Why there might be a change in the density of a forged product as
compared to that of the cast blank.
D. A cylindrical workpart with D=2.5 in and h=2.5 in is upset forged in an open
die to a height = 1.5 in. Coefficient of friction at the die -work interface = 0.10
The work material has a flow curve defined by: K= 40,000 lb/in' and n-0.15.
Determine the instantaneous force in the operation (a) just as the yield point
is reached (yield at strain = 0.002), (b) at height = 2.3 in. (c) h= 1.9 in, and
(d) h = 1.5 in.
a List…
Chapter 24 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 24 - Suppose that you wanted to machine cast iron with...Ch. 24 - How is the feed per tooth related to the feed rate...Ch. 24 - Why must the number of teeth on the cutter be...Ch. 24 - Why is the question of up or down milling more...Ch. 24 - For producing flat surfaces in mass-production...Ch. 24 - Milling has a higher metal removal rate than...Ch. 24 - Which type of milling (up or down) is being done...Ch. 24 - Why does down milling dull the cutter more rapidly...Ch. 24 - What parameters do you need to specify in order to...Ch. 24 - In Figure 24.2b, the tool material is carbide....
Ch. 24 - What is the advantage of a helical-tooth cutter...Ch. 24 - What would the cutting force diagram for Fc look...Ch. 24 - Could the stub arbor-mounted face mill shown in...Ch. 24 - In a typical solid arbor milling cutter shown in...Ch. 24 - Make some sketches to show how you would you set...Ch. 24 - Make some sketches to show how you would set up a...Ch. 24 - Explain how controlled movements of the work m...Ch. 24 - Prob. 18RQCh. 24 - What is the purpose of the hole-circle plate on a...Ch. 24 - You have selected a feed per tooth and a cutting...Ch. 24 - How much time will be required for a milling...Ch. 24 - If the depth of cut is 0.35 in., what is the metal...Ch. 24 - Prob. 4PCh. 24 - Calculate the spindle rpm and table feed (ipm) for...Ch. 24 - A gray cast iron surface 6 in. wide and 18 in....Ch. 24 - Prob. 7PCh. 24 - In Figure 24.12, the feed is 0.006 in. per tooth....Ch. 24 - Suppose you want to do the job described in...Ch. 24 - The Bridgeport vertical-spindle milling machine is...Ch. 24 - The KC Machine Works, which does job shop...
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- 2.14 W hy is cBN generally preferred over diamond for machining steels?arrow_forwardCan cast iron be machined without using any cutting fluid? (Yes or No)arrow_forwardThe tailstock has two major parts a bottom casting and a top casting is machined very accurately to fit the ways of the lathe [(a dogs (b) bed (c) carriage (d) mandrelarrow_forward
- 1. A milling operation is to be performed on a ductile cast iron shaft to make slots for assembly. The operation will be done at high speeds for good surface finish. For each of the following tool materials, indicate whether it is a reasonable candidate to use in the operation with a detailed description of why or why not including required alloying element/grade/group etc. where applicable: ) plain carbon steel, (i) high-speed steel, (ii)cemented carbide, (iv) ceramic, and (v) Sintered polycrystalline diamond. After selection of material/materials discuss about ) recommended angles and tool signature (ii) how to held cutting edge, and type of cutting fluids With reasons for each recommended material.arrow_forward1. A milling operation is to be performed on a ductile cast iron shaft to make slots for assembly. The operation will be done at high speeds for good surface finish. For each of the following tool materials, indicate whether it is a reasonable candidate to use in the operation with a detailed description of why or why not including required alloying element/grade/group etc. where applicable: (i) plain carbon steel, (ii) high-speed steel, (iii) cemented carbide, (iv) ceramic, and (v) Sintered polycrystalline diamond. After selection of material/materials discuss about (i) recommended angles and tool signature (ii) how to held cutting edge, and type of cutting fluids With reasons for each recommended material. 2. Make a figure and explain how shear plane angle effect the power requirements in the machining. How can you reduce the power requirements during machining in orthogonal cutting?arrow_forwardNonearrow_forward
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