Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Textbook Question
Chapter 33, Problem 35QLP
List manufacturing operations in which high friction is desirable and those in which low friction is desirable.
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A machine vice, as shown in
Fig. 6.12, has single-start, square threads with
22 mm nominal diameter and 5 mm pitch. The
outer and inner diameters of the friction collar
are 55 and 45 mm respectively. The coefficients
of friction for thread and collar are 0.15 and 0.17
respectively. The machinist can comfortably exert a
force of 125 N on the handle at a mean radius of 150
mm. Assuming uniform wear for the collar, calculate
(i) the clamping force developed between the
jaws; and
(ii) the overall efficiency of the clamp.
Fixed
Moving
jaw
jaw
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Handle
+150 mm
With suitable sketches of the relationship of friction force and applied load, briefly explain the concept of friction force.
Please give answers to both of these parts, thanks
(a) Manufacturing is “ the transformation of materials into items of greater value by means of one or more processing and/or assembly operations”. Elaborate on this statement
(b) It is not possible to conduct a rolling process without friction. Explain this statement.
Chapter 33 Solutions
Manufacturing Engineering & Technology
Ch. 33 - What is tribology?Ch. 33 - Explain what is meant by (a) surface texture and...Ch. 33 - List and explain the types of defects typically...Ch. 33 - Define the terms (a) roughness, and (b) waviness.Ch. 33 - Explain why the results from a profilometer are...Ch. 33 - Prob. 6RQCh. 33 - List the types of wear generally observed in...Ch. 33 - Define the terms wear, friction, and lubricant.Ch. 33 - How can adhesive wear be reduced? Abrasive wear?Ch. 33 - Prob. 10RQ
Ch. 33 - Explain the functions of a lubricant in...Ch. 33 - Prob. 12RQCh. 33 - Prob. 13RQCh. 33 - Describe the factors involved in lubricant...Ch. 33 - Prob. 15RQCh. 33 - Prob. 16QLPCh. 33 - Explain the significance of the fact that the...Ch. 33 - Prob. 18QLPCh. 33 - Explain why identical surface-roughness values do...Ch. 33 - Prob. 20QLPCh. 33 - Prob. 21QLPCh. 33 - Prob. 22QLPCh. 33 - Prob. 23QLPCh. 33 - Comment on the surface roughness of various parts...Ch. 33 - Prob. 25QLPCh. 33 - Do the same as for Problem 33.25, but for surface...Ch. 33 - Describe your observations regarding Fig. 33.7.Ch. 33 - Give the reasons that an originally round specimen...Ch. 33 - Prob. 29QLPCh. 33 - Explain the reason that the abrasive-wear...Ch. 33 - Prob. 31QLPCh. 33 - List the similarities and differences between...Ch. 33 - Explain why the types of wear shown in Fig. 33.11...Ch. 33 - List the requirements of a lubricant.Ch. 33 - List manufacturing operations in which high...Ch. 33 - List manufacturing operations in which high wear...Ch. 33 - Prob. 37QLPCh. 33 - Prob. 38QTPCh. 33 - A surface with a triangular sawtooth roughness...Ch. 33 - List the steps you would follow if you wished to...Ch. 33 - Discuss the tribological differences between...Ch. 33 - Section 33.2 listed major surface defects. How...Ch. 33 - Describe your own thoughts regarding biological...Ch. 33 - Prob. 48SDPCh. 33 - Prob. 49SDPCh. 33 - Prob. 50SDPCh. 33 - Describe your thoughts on the desirability of...
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- During a hot upset forging process the starting diameter of work part is 36 mm, and starting height is 66 mm. The work part is upset by open die to diameter 70 mm. The strength coefficient of work metal is 45 MPa, and coefficient of friction between die and work interface is 0.2. Determine (a) Final height of the work part, (b) maximum force in the process.arrow_forwardDifferentiate between dry friction and internal friction ?arrow_forwardQuestion 2. It is reduced to 80 mm with forging by stacking a part with a height of 120 mm and a diameter of 75 mm. The friction coefficient between the workpiece and the mold is 0.13. The flow curve of the workpiece is defined by a strength coefficient of 165 MPa and a ping-top of 0.24. Calculate the force during the process at the moments given below and obtain the force-workpiece height graph (1) as soon as it reaches the flow point (flow unit shape change = 0.002), (2) height h = 115 mm, (3) height h = 110 mm, (4) height h = 105 mm, (5) height h = 100 mm, (6) height h = 95 mm, (7) height h = 90 mm, (8) height h = 85 mm, (9) height h = 80 mm,arrow_forward
- List and describe all mechanical press setups for which it is legal to use hand feeding.arrow_forwardA strip (300x30 mm) is fed through a rolling mill with two powered rolls (each with radius of 300 mm) rotating at the speed of 60 rpm. The flow stress of work material is 90 MPa, and the coefficient of friction between rolls and work is 0.12. For a single rolling operation performed at the contact angle of 6.28°, calculate the followings:a) Work thickness after rolling (in mm)arrow_forwardA compound die is used to blank and punch a large washer out of 6061ST aluminum alloy sheet stock 3.2 mm thick. The outside diameter of the washer is 25.0 mm, and the inside diameter is 12.0 mm. Determine (a) the punch and die sizes for the blanking and punching operations, (b) the force required to perform the blanking and punching operation under the following conditions: (a) blanking and punching occur simultaneously and (b) the punches are staggered so that punching occurs first, then blanking. The aluminum has a tensile strength = 350 MPa.arrow_forward
- A cylindrical working part is subjected to a forging landfall operation. The blank is 3.0 in. high and 2.0 in. diameter. In operation, its height is reduced to 1.5 in. The work material has a yield curve defined by K = 50 ksi and n = 0.17. Assume a coefficient of friction of 0.1. Determine the force at the beginning of the process, at intermediate heights of 2.5 in. and 2.0 in., and at the final height of 1.5 in.arrow_forwardA plate that is 250 mm wide and 25 mm thick is to be reduced in a single pass in a two-high rolling mill to a thickness of 20 mm. The roll has a radius = 500 mm, and its speed = 30 m/min. The work material has a strength coefficient = 240 MPa and a strain hardening exponent = 0.2. Determine (a)roll force, (b) roll torque, and (c) power required to accomplish this .operation 1365 N & 529865 N-m & 452 W O 500250 N & 12005 N-m & 2456 W O 71254632 N & 135674 N-m & 12053 W O 1851829 N & 46296 N-m & 92,591 W Oarrow_forwardWhat are the important factors to take into consideration when solving problems related to friction (Dry or Coulomb friction)?arrow_forward
- See the figure below. This figure shows three compression processes A, B and C. Assuming that the processes are similar, made with the same equipment and working fluid, but with different lubricants (which reduce friction), which one has greater friction? Why?arrow_forwardDo pleasearrow_forwardHi, could you show workings out if possible please, thanks youarrow_forward
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