A turning operation is carried out on aluminum. Based on the specific energy values in the table in your text, determine material removal rate and cutting power in the operation under the following sets of conditions: (a) Cutting speed = 5.6 m/s, feed = 0.25 mm/rev, and depth of cut = 2.0 mm; and (b) cutting speed = 1.3 m/s, feed = 0.75 mm/rev, and depth of cut = 4.0 mm. ■Table 20.2 Typical values of unit horsepower and specific energy for selected work materials usingsharp cutting tools and chip thickness before the cut t = 0.25 mm (0.010 in).MaterialCarbon steelAlloy steelsCast ironsBrinell Hardness150-200201-250251-300200-250251-300301-350351-400125-175175-250Stainless steelAluminumAluminum alloysBrassBronzeMagnesium alloysData compiled from [6], [8], (11), and other sources.150-25050-100100-150100-150100-15050-100Specific Energy U orUnit Power PN-m/mm³1.62.22.83.60.82.20.4(in-lb/in³)(240,000)(320,000)(400,000)(320,000)(400,000)(520,000)(640,000)(160,000)(240,000)(400,000)(100,000)(120,000)(320,000)(320,000)(60,000)Unit HorsepowerHP hp/(in/min)(0.6)(0.8)(1.0)(0.8)(1.0)(1.3)(1.6)(0.4)(0.6)(1.0)(0.25)(0.3)(0.8)(0.8)(0.15)should be multiplied by a factor between 1.00 and 1.25 depending on the degree of dullness of the tool.For sharp tools, the factor is 1.00. For tools in a finishing operation that are nearly worn out, the factoris around 1.10, and for tools in a roughing operation that are nearly worn out, the factor is 1.25.Chip thickness before the cut also affects the specific energy and unit horsepower values. As T

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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A turning operation is carried out on aluminum. Based on the specific energy values in the table in your text, determine material removal rate and cutting power in the operation under the following sets of conditions: (a) Cutting speed = 5.6 m/s, feed = 0.25 mm/rev, and depth of cut = 2.0 mm; and (b) cutting speed = 1.3 m/s, feed = 0.75 mm/rev, and depth of cut = 4.0 mm.

■Table 20.2 Typical values of unit horsepower and specific energy for selected work materials using
sharp cutting tools and chip thickness before the cut t = 0.25 mm (0.010 in).
Material
Carbon steel
Alloy steels
Cast irons
Brinell Hardness
150-200
201-250
251-300
200-250
251-300
301-350
351-400
125-175
175-250
Stainless steel
Aluminum
Aluminum alloys
Brass
Bronze
Magnesium alloys
Data compiled from [6], [8], (11), and other sources.
150-250
50-100
100-150
100-150
100-150
50-100
Specific Energy U or
Unit Power P
N-m/mm³
1.6
2.2
2.8
3.6
0.8
2.2
0.4
(in-lb/in³)
(240,000)
(320,000)
(400,000)
(320,000)
(400,000)
(520,000)
(640,000)
(160,000)
(240,000)
(400,000)
(100,000)
(120,000)
(320,000)
(320,000)
(60,000)
Unit Horsepower
HP hp/(in/min)
(0.6)
(0.8)
(1.0)
(0.8)
(1.0)
(1.3)
(1.6)
(0.4)
(0.6)
(1.0)
(0.25)
(0.3)
(0.8)
(0.8)
(0.15)
should be multiplied by a factor between 1.00 and 1.25 depending on the degree of dullness of the tool.
For sharp tools, the factor is 1.00. For tools in a finishing operation that are nearly worn out, the factor
is around 1.10, and for tools in a roughing operation that are nearly worn out, the factor is 1.25.
Chip thickness before the cut also affects the specific energy and unit horsepower values. As T

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