Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 22, Problem 32QLP
Make a survey of the technical literature, and give some typical values of cutting speeds for high-speed steel tools and for a variety of workpiece materials.
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3) Explain the advantages and any disadvantages of indexable cutting inserts. Why
were they developed?
4) How does the coefficient of friction affect the relationship between the friction
force and the normal force on the tool face?
5) A turning operation is being carried out on a long, round bar at a constant depth of
cut. Explain what differences, if any, there may be in the machined diameter from
one end of the bar to the other. Give reasons for any changes that may occur.
Estimate 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.
In 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.
Chapter 22 Solutions
Manufacturing Engineering & Technology
Ch. 22 - What are the major properties required of...Ch. 22 - What is the composition of a typical carbide tool?Ch. 22 - Why were cutting-tool inserts developed?Ch. 22 - Why are some tools coated? What are the common...Ch. 22 - Explain the applications and limitations of...Ch. 22 - List the major functions of cutting fluids.Ch. 22 - Why is toughness important for cutting-tool...Ch. 22 - Is the elastic modulus important for cutting-tool...Ch. 22 - Explain how cutting fluids penetrate the toolchip...Ch. 22 - List the methods by which cutting fluids are...
Ch. 22 - Describe the advantages and limitations of (a)...Ch. 22 - What is a cermet? What are its advantages?Ch. 22 - Explain the difference between M-series and...Ch. 22 - Why is cBN generally preferred over diamond for...Ch. 22 - What are the advantages to dry machining?Ch. 22 - Explain why so many different types of...Ch. 22 - Which tool-material properties are suitable for...Ch. 22 - Describe the reasons for and advantages of coating...Ch. 22 - Make a list of the alloying elements used in...Ch. 22 - As stated in Section 22.1, tool materials can have...Ch. 22 - Explain the economic impact of the trend shown in...Ch. 22 - Why does temperature have such an important effect...Ch. 22 - Ceramic and cermet cutting tools have certain...Ch. 22 - What precautions would you take in machining with...Ch. 22 - Can cutting fluids have any adverse effects in...Ch. 22 - Describe the trends you observe in Table 22.2.Ch. 22 - Why are chemical stability and inertness important...Ch. 22 - Titanium-nitride coatings on tools reduce the...Ch. 22 - Describe the necessary conditions for optimal...Ch. 22 - Negative rake angles generally are preferred for...Ch. 22 - Do you think that there is a relationship between...Ch. 22 - Make a survey of the technical literature, and...Ch. 22 - In Table 22.1, the last two properties listed...Ch. 22 - It has been stated that titanium-nitride coatings...Ch. 22 - Note in Fig. 22.1 that all tool materials,...Ch. 22 - Referring to Table 22.1, state which tool...Ch. 22 - Which of the properties listed in Table 22.1 is,...Ch. 22 - If a drill bit is intended only for woodworking...Ch. 22 - What are the consequences of a coating on a tool...Ch. 22 - Discuss the relative advantages and limitations of...Ch. 22 - Emulsion cutting fluids typically consist of 95%...Ch. 22 - List and explain the considerations involved in...Ch. 22 - Review the contents of Table 22.1. Plot several...Ch. 22 - Obtain data on the thermal properties of various...Ch. 22 - The first column in Table 22.2 shows 10 properties...Ch. 22 - Describe in detail your thoughts regarding the...Ch. 22 - One of the principal concerns with coolants is...Ch. 22 - How would you go about measuring the effectiveness...Ch. 22 - There are several types of cutting-tool materials...Ch. 22 - Assume that you are in charge of a laboratory for...Ch. 22 - Tool life could be greatly increased if an...Ch. 22 - List the concerns you would have if you needed to...
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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
- The outside diameter of a cylinder made of steel is to be turned. The starting diameter is 120 mm and the length is 1400 mm. The feed is 0.3 mm/rev and the depth of cut is 2.5mm. The cut will be made with a cemented carbide cutting tool whose Taylor tool life parameters are: n= 0.33 and C=500. Units for the Taylor equation are min for tool life and m/min for cutting speed. Compute the cutting speed that will allow the tool life to be just equal to the cutting time required to complete this turning operation.arrow_forwardExplain the mechanics of metal cutting with neat sketch. Why machining of ductile and brittle material leads to form continuous and discontinuous chip respectively?arrow_forward(a) Explain the differences between High-speed steels, cubic boron nitride and polycrystalline diamonds cutting tools.arrow_forward
- 2 2 . 16 Explain why so many different types of cutting-tool materials have been developed over the years. Why are they still being developed further?arrow_forwardNote: Read the question carefully and give me right solutions according to the question. In orthogonal cutting of steel tube of 150 mm diameter and 2 mm thick, the cutting force was 130 kg and feed force was 35 kg for chip thickness of 0.3mm. The orthogonal cut was taken at 60 meter per minute with a feed of 0.14 mm/rev. If the back rack angle of the cutting tool was - 8 o (minus 8 degree), then calculate the shear strain and strain energy per unit volume.arrow_forward3. On an upright drilling machine, a 20 mm diameter hole is to be produced in a plate of SAEE112 steel of 30 mm thickness. The cutting speed selected is 10 m/min, and the cutting torque measured is 20 N.m. Calculate the spindle speed, the depth of cut, the main cutting force, and the cutting power.arrow_forward
- (e) Briefly describe types of chips that occur in metal cutting. (f) For orthogonal cutting, the tool rake angle =15°. The chip thickness before the cut is 0.30mm and the cut yields a deformed chip thickness = 0.65mm. Calculate the shear plane angle and shear strain.arrow_forwardIn conventional metal cutting process,tool wear is inevitable.Explain why cutting tool failure due to tool wear is difficult to predict.(Write it broadly in your own words)arrow_forward2 1.23 Tool life can be almost infinite at low cutting speeds.Would you then recommend that all machining be done at low speeds? Explain.arrow_forward
- Question 2. The two sources of heat are (a) shearing in the primary shear plane and (b) friction at the tool-chip interface. What type of the tool wear or tool failure could be caused as a result of developing these heat sources on machining process? Explain your answer in accordance with following representation of tool wear. Insert cutting edgearrow_forward(b) An orthogonal cutting operation is being carried out under the following conditions: depth of cut, to = 0.1 mm, chip thickness, to = 0.2 mm, width of cut = 4 mm, cutting speed, v = 3 m/s, rake angle, a = 10°, Cutting force, Fc = 500 N, and Thrust force, F1= 200 N. Calculate the percentage of the total energy that is dissipated in the shear plane of cutting process.arrow_forward(b) During a certain machining experiment at the UCSI workshop, it is observed that temperature at the tool workpiece interface is 1200 °C at a cutting speed of 300 mm/min with a feed rate of 0.002 mm/rev. (1) Analyse how the temperature will be affected if the cutting speed is increased by 100 %. (ii) Detemine the cutting speed necessary to achieve a maximum cutting temperature of 900 °C.arrow_forward
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