In a straight turning operations the diameter of a workpiece is reduced from 50 mm 40 mm using a feed rate of 0.1 mm/rev. The cutting tool used for the process has a normal working rake angle of 15°, clearance angle of 4° and a lead angle of 90°. The cutting force of 1200 N and a thrust force of 660 N is measured during cutting operations. The workpiece material was stainless steel with a density of 7850 Kg/m³, thermal conductivity is 15 J/smK, specific heat is 480 J/kgK. The width of the secondary deformation zone divided by the chip thickness wo is assumed to be 0.2 for the above mentioned cutting conditions. The chip/tool contact length is measured as 1.5 mm. (a) Calculate the temperature rise in the primary deformation zone (b) Calculate the temperature rise in the secondary deformation zone (c) Calculate the maximum temperature if the room temperature is 24°C If the tool life for the average cutting velocity of 90 m/min is measured as 10 min. and for a cutting velocity of 160 m/min is measured as 6 min. estimate the tool life when machining at:

In a straight turning operations the diameter of a workpiece is reduced from 50 mm 40 mm using a feed rate of 0.1 mm/rev. The cutting tool used for the process has a normal working rake angle of 15°, clearance angle of 4° and a lead angle of 90°. The cutting force of 1200 N and a thrust force of 660 N is measured during cutting operations. The workpiece material was stainless steel with a density of 7850 Kg/m³, thermal conductivity is 15 J/smK, specific heat is 480 J/kgK. The width of the secondary deformation zone divided by the chip thickness wo is assumed to be 0.2 for the above mentioned cutting conditions. The chip/tool contact length is measured as 1.5 mm. (a) Calculate the temperature rise in the primary deformation zone (b) Calculate the temperature rise in the secondary deformation zone (c) Calculate the maximum temperature if the room temperature is 24°C If the tool life for the average cutting velocity of 90 m/min is measured as 10 min. and for a cutting velocity of 160 m/min is measured as 6 min. estimate the tool life when machining at:

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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Concept explainers

Machining Processes and Machine Tools

Machining is represented as the process in which an excessive amount of substance is eliminated from the particular element in the form of pieces. In machining, cutting tools such as rotary tools, lathe, drill press, grinder, chop saw, welders, and many more are applied to get the desired shape. As compared to other manufacturing processes, machining is precise and versatile.

Question

In a straight turning operations the diameter of a workpiece is reduced from 50 mm 40 mm using a feed
rate of 0.1 mm/rev. The cutting tool used for the process has a normal working rake angle of 15°, clearance
angle of 4° and a lead angle of 90°. The cutting force of 1200N and a thrust force of 660 N is measured
during cutting operations. The workpiece material was stainless steel with a density of 7850 Kg/m³,
thermal conductivity is 15 J/smK, specific heat is 480 J/kgK. The width of the secondary deformation zone
divided by the chip thickness wo is assumed to be 0.2 for the above mentioned cutting conditions. The
chip/tool contact length is measured as 1.5 mm.
(a) Calculate the temperature rise in the primary deformation zone
(b) Calculate the temperature rise in the secondary deformation zone
(c) Calculate the maximum temperature if the room temperature is 24°C
If the tool life for the average cutting velocity of 90 m/min is measured as 10 min. and for a cutting velocity
of 160 m/min is measured as 6 min. estimate the tool life when machining at:
(a) 100 m/min
(b) 200 m/min
Assume that all other machining process parameters are the same.
Hint: Taylor Equation in a metric system is defined as:
197v,
60
C
1,

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