Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 23, Problem 28QLP
Assume that you are asked to perform a boring operation on a large-diameter hollow workpiece. Would you use a horizontal or a vertical boring mill? Explain.
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A 200 mm long magnesium alloy bar, 63 mm in diameter is turned on a lathe using a high speed steel cutter travelling at 180 mm/min. The spindle rotates at 450 rpm and lathe is equipped with a 10 kW motor, operating at a mechanical efficiency of 92%. The final diameter of the magnesium alloy bar is 59,5 mm.
Indicate with a sketch the recommend size and location of the following tool angles: back rake, side rake, end relief, side relief and side and end cutting edge.
Calculate the cutting time for the machining process.Calculate the required cutting force.
1. A 7.5 -mm-diameter drill is used on a drill press operating at 300 rpm. If the feed is 0.125 mm/rev, what is the MRR? What is the MRR if the drill diameter is doubled?
2. Assume that the work piece material is high-strength aluminum alloy and the spindle is running at N = 500 rpm. Estimate the torque required for this operation.
A cylindrical work part 200
mm in diameter and 700mm
long is to be turned in an
engine lathe. cutting
conditions are as follows: -
cutting speed 2.3 m/s. feed
is 0.32 mm/rev. depth of cut
is 1.8 mm. calculate cutting
time.
Chapter 23 Solutions
Manufacturing Engineering & Technology
Ch. 23 - Describe the types of machining operations that...Ch. 23 - What is turning? What kind of chips are produced...Ch. 23 - What is the thrust force in turning? What is the...Ch. 23 - What are the components of a lathe?Ch. 23 - (a) What is a tracer lathe? (b) What is an...Ch. 23 - Describe the operations that can be performed on a...Ch. 23 - Why were power chucks developed?Ch. 23 - Explain why operations such as boring on a lathe...Ch. 23 - Why are turret lathes typically equipped with more...Ch. 23 - Describe the differences between boring a...
Ch. 23 - How is drill life determined?Ch. 23 - What is the difference between a conventional...Ch. 23 - Why are reaming operations performed?Ch. 23 - Explain the functions of the saddle on a lathe.Ch. 23 - Describe the relative advantages of (a)...Ch. 23 - Explain how external threads are cut on a lathe.Ch. 23 - Prob. 17RQCh. 23 - Explain the reasoning behind the various design...Ch. 23 - Note that both the terms tool strength and...Ch. 23 - (a) List and explain the factors that contribute...Ch. 23 - Explain why the sequence of drilling, boring, and...Ch. 23 - Why would machining operations be necessary even...Ch. 23 - A highly oxidized and uneven round bar is being...Ch. 23 - Describe the difficulties that may be encountered...Ch. 23 - (a) Does the force or torque in drilling change as...Ch. 23 - Explain the similarities and differences in the...Ch. 23 - Describe the advantages and applications of having...Ch. 23 - Assume that you are asked to perform a boring...Ch. 23 - Explain the reasons for the major trend that has...Ch. 23 - Describe your observations concerning the contents...Ch. 23 - The footnote to Table 23.12 states that as the...Ch. 23 - In modern manufacturing, which types of metal...Ch. 23 - Sketch the tooling marks you would expect if a...Ch. 23 - What concerns would you have in turning a powder...Ch. 23 - The operational severity for reaming is much lower...Ch. 23 - Review Fig. 23.6, and comment on the factors...Ch. 23 - Explain how gun drills remain centered during...Ch. 23 - Comment on the magnitude of the wedge angle on the...Ch. 23 - If inserts are used in a drill bit (see Fig....Ch. 23 - Refer to Fig. 23.11b, and in addition to the tools...Ch. 23 - Calculate the same quantities as in Example 23.1...Ch. 23 - Estimate the machining time required to rough turn...Ch. 23 - A high-strength cast-iron bar 8 in. in diameter is...Ch. 23 - A 0.30-in.-diameter drill is used on a drill press...Ch. 23 - In Example 23.4, assume that the workpiece...Ch. 23 - For the data in Problem 23.45, calculate the power...Ch. 23 - A 6-in.-diameter aluminum cylinder 10 in. in...Ch. 23 - A lathe is set up to machine a taper on a bar...Ch. 23 - Assuming that the coefficient of friction is 0.25,...Ch. 23 - A 3-in.-diameter, gray cast iron cylindrical part...Ch. 23 - Would you consider the machining processes...Ch. 23 - Would it be difficult to use the machining...Ch. 23 - If a bolt breaks in a hole, it typically is...Ch. 23 - An important trend in machining operations is the...Ch. 23 - Review Fig. 23.8d, and explain if it would be...Ch. 23 - Boring bars can be designed with internal damping...Ch. 23 - A large bolt is to be produced from extruded...Ch. 23 - Make a comprehensive table of the process...
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- In face milling, assume that the Diameter of the cutter is 200 mm, the width of the block is 60 mm, and the length of the block is 344 mm, if the depth of cut is 3 mm, = 0.6 mm/min, and N = 100 rpm. The cutter has 12 inserts, and the workpiece material is bronze. Calculate the estimated power required, the cutting force, and the torque.arrow_forwardAn external turning operation is performed on a hollow workpiece of 200 mm external diameter and 100 mm inner diameter, at 40 m/min cutting speed, 2 mm depth of cut and 0.20 mm/rev feed. Calculate: The rotational speed for this workpiece. The machining time needed for a length of 250 mm. The material removal rate used. The parting-off time needed if the cross feed is 0.1 mm/rev. The expected tool life if the constants in Taylor Formula are n=0.23 and C= 240. The maximum number of work pieces that could be produced under the given cutting conditions, before the tool needs re-sharpening.arrow_forwardSuppose in a face milling operation, the dimensions of the workpiece are 5 inches by 10 inches. The cutter is 6 inches in diameter, has 8 teeth, and rotates at 300 rpm. The depth of cut is 0.125 inches and the feedrate is 0.005 inches / tooth. Assume that the specific power requirement for this material is 2 hp min / in3 and that only 75% of the cutter diameter is involved in cutting. Calculate (a) the required power, and (b) the material removal rate.arrow_forward
- A 600mm*30mm flat surface of a plate is to be finish machined on a shaper .The plate has been fixed with 600 mm side along the tool travel direction. If the tool over-travel at each end of the plate is 20 mm, average cutting speed is 8 m/min, feed rate is 0.3 mm/stroke and the ratio of return time to cutting time of the tool is 1:2 Determine time required for machining?arrow_forwardCalculate the spindle speed for a Lathe Machine, if the cutting speed for a mild steel material workpiece is 34 m/min and the diameter of the cylindrical workpiece is 46 mm.arrow_forwardIn machining a mild steel work piece with carbide tool, the life of the tool was found to be 1 hour and 40 minutes, at a spindle speed of 30 m/min. Calculate the tool life if it has to be operated at a speed of 40% higher than the initial cutting speed. Also calculate the cutting speed if the tool is required to have a life of 2 hours and 45 minutes. Assume Taylor's exponent valuen is 0.28.arrow_forward
- In a turning operation, the workpiece diameter is Dm=44.00 mm and the diameter after the operation should be 22.00 mm. The cutting speed is set to 105.00 m/min and the federate is 0.03 mm/rev. Calculate the material 3 removal rate (Cm²Imin) for this operation (Do not input units). Your Answer: Answerarrow_forwardA 78 mm thick plate is to be milled down to a thickness of 60 mm using an 80 mm face milling cutter. Calculate the processing time if the cutting depth is 6 mm, the feed/rev is 1.1 mm and the cutting speed is 15 m/min, and if the over run for a 620 mm long plate is 10 mm.arrow_forwardEstimate the machining time required in rough turning a 2.0-m-long, annealed aluminum-alloy round bar that is 75 mm in diameter, using (a) a high-speed steel tool; and (b) a carbine tool. Use a feed of 2 mm/rev. Assume max cutting speed for high-speed tools is moving 4 m/s and for carbide tools is moving 7 m/s.arrow_forward
- A slab milling operation is performed on the top surface of a tool-steel workpiece 450 mm long by 7.5 cm wide. The helical milling cutter, which has an 80 mm diameter and seven teeth, is set up to overhang the width of the part on both sides. Cutting speed is 4000 mm/min, feed is 0.015 cm/tooth, and depth of cut = 0.60 cm. Determine (a) the actual machining time to make one pass across the surface and (b) the maximum metal removal rate during the cut. (c) If an additional approach distance of 0.05 m is added at the beginning of the pass, and an overtravel distance at the end of the pass equal to the cutter radius plus 0.0115 cm, what is the duration of the feed motionarrow_forwardA 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.arrow_forward(a) Explain the difference between roughing and finishing operations in machining.(b) What are the parameters of a machining operation that are included within the scope of cuttingconditions?(c) What is the difference between threading and tapping?(d) A cylindrical workpiece is to be turned in a lathe. Determine the material removal rate if thecutting speed = 2.30 m/s, feed = 0.32 mm/rev, and depth of cut = 1.8 mm.(e) In a turning operation using high-speed steel tooling, the cutting speed = 110 m/min. The Taylortool life equation has parameters n = 0.140 and C = 150 (m/min) when the operation is conducteddry. When a coolant is used in the operation, the value of C is increased by 15%. Determine thepercent increase in tool life that will result if the cutting speed is maintained at 110 m/min.arrow_forward
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