D Question 15 In straight turning process, the cutting force component which is directly proportional to the consumed cutting energy is: O cutting force component normal to the feed direction O cutting force component normal to the tool face O cutting force component normal to the depth of cut resultant force of all force components O cutting force parallel to the tool face (chip flow direction) Question 16 Optimum cutting speed for minimum cost is: O higher than cutting speed at maximum production rate O equals to half the cutting speed at maximum production rate O higher than cutting speed at maximum efficiency equals to half the cutting speed at maximum efficiency O lower than cutting speed at maximum efficiency

D Question 15 In straight turning process, the cutting force component which is directly proportional to the consumed cutting energy is: O cutting force component normal to the feed direction O cutting force component normal to the tool face O cutting force component normal to the depth of cut resultant force of all force components O cutting force parallel to the tool face (chip flow direction) Question 16 Optimum cutting speed for minimum cost is: O higher than cutting speed at maximum production rate O equals to half the cutting speed at maximum production rate O higher than cutting speed at maximum efficiency equals to half the cutting speed at maximum efficiency O lower than cutting speed at maximum efficiency

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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In a turning operation, cutting speed =200 m/min; feed = 0.25mm mm/rev, and depth of cut = 4.00mm Thermal diffusivity of the work material = 20m mm^2/s and volumetric specific heat =3.5(10^ -3 )J/mm^ 3 -C If the temperature increase above ambient temperature (20degreesC) is the angle measured by a tool-chip thermocouple to be 700degreesC, determine the specific energy for the work material in this operation.
During a certain machining experiment at the UCSI workshop, it is observedthat temperature at the tool workpiece interface is 1200 oC at a cutting speed of300 mm/min with a feed rate of 0.002 mm/rev. (i) Analyse how the temperature will be affected if the cutting speed isincreased by 100 %.(ii) Determine the cutting speed necessary to achieve a maximum cuttingtemperature of 900 oC
A turning operation is made with a rake angle of 10 degrees, a feed of 0.010 in/rev, and a depth of cut = 0.100 in. The shear strength of the work material is known to be 50,000 lb/in2, and the chip thickness ratio after the cut = 0.40. Determine the cutting force and the thrust force. Use the orthogonal cutting model as an approximation of the turning process.
Low carbon steel having a tensile strength of 450 MPa and a shear strength of 270 MPa is cut in a turning operation with a cutting speed of 2500 mm/s. The feed is 0.15 mm/rev, and the depth of cut is 0.25 cm. The rake angle of the tool is 12° in the direction of chip flow. The resulting chip ratio is 0.55. Using the orthogonal model as an approximation of turning, determine (a) the shear plane angle, (b) shear force, (c) cutting force and feed force.
Find the machining time, in seconds, and the rate of material removing in mmA3;sec for a turning operation having the following information: 1- Wp diameter is 80mm, 2- the length is 0.12m, 3- the cutting speed is 80m/min, 4- feed i50.5 mm/rev and 5- the depth of cut is 0.002m.
21.47 State whether or not the following statements are true, explaining your reasons: (a) For the same shear angle, there are two rake angles that give the same cutting ratio, (b) For the same depth of cut and rake angle, the type of cutting fluid used has no influence on chip thickness, (c) If the cut ting speed, shear angle, and rake angle are known, the chip velocity can be calculated, (d) The chip becomes thinner as the rake angle increases, (e) The function of a chip breaker is to decrease the curvature of the chip.
In a turning operation, the tool life varies with cutting speed, as shown in following table:Cutting speed, V, m/min Tool life, T, min25 3070 2 Estimate the tool life for this operation at a speed of 60 m/min.
a) It has been stated that it is generally undesirable to allow temperatures to riseexcessively in machining operations. Explain why?b) List out the cutting parameters which is influenced the rises of cuttingtemperature during turning process.c) Evaluate the relationship of these cutting parameters to the cutting temperaturewith graph.d) Propose the solution of how to reduce the temperature during the cuttingprocess.
In orthogonal turning of a bar 100 mm diameter with a feed of 0.25 mm/rev., depth of cut = 4 mm, cutting velocity = 90 m/min. it is observed that the main cutting force is perpendicular to friction force acting at the chip tool interface and cutting force is 1500 N. find (i) rake angle (ii) normal force.
22.40 Discuss the relative advantages and limitations of neardry machining. Consider all relevant technical and economic aspects.
Suppose 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.
21.12 What is the function of chip breakers? How do they function? Do you need a chip breaker to eliminate continuous chips in oblique cutting? Explain.