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 21, Problem 3P
If the cutting forces is 1000 lb calculate the horsepower that a process operating at a speed of 80 fpm is going to use.
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A motorised metal guillotine machine is required to cut 45 mm diameter hole in a plate of 20 mm thickness at rate of 35 holes per minute. It requires a torque of 7 Nm for an area of hole in mm2. If the cutting takes 1/10 of a second and the speed of its flywheel varies from 165 rpm to 145 rpm, calculate:4.1. Energy required to cut a hole.4.2. Energy required for cutting work per second.4.3. Maximum fluctuation of energy of the flywheel.4.4. Mass of the flywheel having radius of gyration of 1.5 m.
A motorised metal guillotine machine is required to cut 45 mm diameter hole in
a plate of 20 mm thickness at rate of 35 holes per minute. It requires a torque
of 7 Nm for an area of hole in mm2. If the cutting takes 1/10 of a second and
the speed of its flywheel varies from 165 rpm to 145 rpm, calculate:
4.1.
Energy required to cut a hole.
4.2.
Energy required for cutting work per second.
43.
Maximum fluctuation of energy of the flywheel.
4.4.
Mass of the flywheel having radius of gyration of 1.5 m.
A motorised metal guillotine machine is required to cut 45 mm diameter hole in
a plate of 20 mm thickness at rate of 35 holes per minute. It requires a torque
of 7 Nm for an area of hole in mm?. If the cutting takes 1/10 of a second and
the speed of its flywheel varies from 165 rpm to 145 rpm, calculate:
4.1.
Energy required to cut a hole.
4.2.
Energy required for cutting work per second.
Chapter 21 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 21 - Why has the metal-cutting process resisted...Ch. 21 - What variables must be considered in understanding...Ch. 21 - Which of the seven basic chip formation processes...Ch. 21 - How is feed related to speed in the machining...Ch. 21 - Before you select speed and feed for a machining...Ch. 21 - Milling has two feeds. What are they, and which...Ch. 21 - What is the fundamental mechanism of chip...Ch. 21 - What is the difference between oblique machining...Ch. 21 - What are the implications of Figure 21.13, given...Ch. 21 - Note that the units for the approximate equation...
Ch. 21 - For orthogonal machining, the cutting edge radius...Ch. 21 - How do the magnitude of the strain and strain rate...Ch. 21 - Why is titanium such a difficult metal to machine?...Ch. 21 - Explain why you get segmented or discontinuous...Ch. 21 - Why is metal cutting shear stress such an...Ch. 21 - Which of the three cutting forces in oblique...Ch. 21 - How is the energy in a machining process typically...Ch. 21 - Where does the energy consumed in metal cutting...Ch. 21 - What are two ways of estimating the primary...Ch. 21 - What are the three different ways to perform...Ch. 21 - Why does the cutting force Fc increase with...Ch. 21 - Why doesnt the cutting force Fc increase with...Ch. 21 - Prob. 23RQCh. 21 - How does the selection of the machining parameters...Ch. 21 - Suppose you had a machining operation (boring)...Ch. 21 - Make a sketch like that shown in Figure 21.1 with...Ch. 21 - Show how you would do near orthogonal machining in...Ch. 21 - Can you do orthogonal machining on a shaper or...Ch. 21 - What process and material combination would yield...Ch. 21 - What is meant by the statement that machining...Ch. 21 - Prob. 31RQCh. 21 - Figure 21.4 provides suggested cutting speeds and...Ch. 21 - For problem 1, suppose you selected a speed of 145...Ch. 21 - If the cutting forces is 1000 lb calculate the...Ch. 21 - Explain how you would estimate the cutting force...Ch. 21 - For a turning operation, you have selected a...Ch. 21 - For a slab milling operation using a...Ch. 21 - The power required to machine metal is related to...Ch. 21 - In order to drill a hole in the material described...Ch. 21 - Suppose you have the data in Table 21.A obtained...Ch. 21 - Calculate the horsepower that a process is going...Ch. 21 - Explain how you would estimate the cutting force...Ch. 21 - Derive equations for F and N using the circular...Ch. 21 - Prob. 14PCh. 21 - Prob. 15PCh. 21 - A manufacturing engineer needs an estimate of the...Ch. 21 - Using Figure 21.4 for input data, determine the...Ch. 21 - Estimate the horsepower needed to remove metal at...Ch. 21 - For a turning process, the horsepower required was...
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- Calculate the r/min required for finish turning a 2in diameter piece of machine steel (The cutting speed of the machine steel is 100).arrow_forwardIn a lathe machine, The diameter of the driver and driven pulley are 2745 mm and 1200 mm respectively, And the driver pulley runs at speed of 225 rpm. Find the speed at which is driven pulley runs in the machine. the speed of the driven pulley in rpm isarrow_forwardFor a turning operation, the cutting speed is 2.5 m/sec, and the depth of cut is 3 mm. A thrustforce of 300 N and cutting force of 400 N are measured. The tool rake angle is 10o and thecutting ratio r is 0.5. If Merchant theory applies, use the graphical method. Find the coefficientof friction between the chip and the tool. Also, the power consumed machining the material.arrow_forward
- ASAParrow_forwardThe workpiece of size 50 mm x 90 mm length is to be reduced to 0 42 mm x 85 mm. If the depth of cut is 0.5 mm, feed is 0.25 mm/rev and cutting speed is 45 m/min find the time taken to complete one job and production rate at the end of 8 hr shift.arrow_forwardA shaper is operated at 120 cutting strokes per minute and is used to machine a work piece of 250 mm in length and 120 mm wide. Use a feed of 0.6 mm per stroke and a depth of cut of 6 mm. Calculate the total machining time to for machining the component. If the forward stroke is completed in 230°, calculate the percentage of the time when the tool is not contacting the work piece.arrow_forward
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