Using the equation of the mean temperature in turning, determine how much the feed should be...
Using the equation of the mean temperature in turning, determine how much the feed should be reduced in order to keep the mean temperature constant when the cutting speed is doubled. The cutting tool material is carbide giving the approximate values of the exponents a and b are a=0.22, b=0.125.
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Using the equation of the mean temperature in turning, determine
how much the feed should be...
a) A workpiece (φ-75 mm, 1 275 mm) is machined using turning at a feed rate of 0.25 mm/rev. At a cutting speed- 3.5 m/s, the turning tool is ineffective after machining 3 parts, and at a cutting s...
a) A workpiece (φ-75 mm, 1 275 mm) is machined using turning at a feed rate of 0.25 mm/rev. At a cutting speed- 3.5 m/s, the turning tool is ineffective after machining 3 parts, and at a cutting speed = 2.5 m/s, the turning tool is effective for producing 20 parts. Calculate the Cutting Speed that will allow 30 parts to be machined between tool changes [20 marks] b) An aluminium alloy workpiece (tensile strength - 325 N/mm2 and yield...
Question 1 A turning operation is carried out on aluminum. Based on the specific energy values...
Question 1 A turning operation is carried out on aluminum. Based on the specific energy values in Table 20.2, determine material removal rate and cutting power in the operation under the following sets of cutting 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 4.0 mm. Question 2 Consider a turning operation performed on steel whose hardness 225 HB at a cutting speed...
During a turning operation on a lathe using a grooved tool, the following forces were recorded:...
During a turning operation on a lathe using a grooved tool, the
following forces were recorded:
Group
1
2
3
4
5
6
Feed force, Fx (kN)
1.70
1.68
1.59
1.75
1.67
1.64
Radial force, Fy (kN)
1.32
1.39
1.44
1.42
1.45
1.38
Tangential force, Fz (kN)
2.18
2.37
2.38
2.32
2.29
2.33
The machine set-up includes a feed (s) of 0.24 mm/rev. and the
depth of cut (d) of 2.5 mm.
Tool rake angle ()
= - 6 deg....
Problem 1 Consider the drilling of Feature 3 (Thru Hole) on the flashlight head (Figure 1)...
Problem 1 Consider the drilling of Feature 3 (Thru Hole) on the flashlight head (Figure 1) Assume the feed of the drilling opcration (i.e., the distance the drill penetrates per unit revolution) is,f= 0.01 inrev. " a) Calculate the material removal rate (in in3/s or mm3/s). b) Use the Taylor Tool Life equation to estimate the tool life (in minutes) for this operation. Use Table 1 to pick appropriate values of C and n (the flashlight material is aluminum and...
Chapter 15: 1. Shear plane angle and shear strain: In an orthogonal cutting operation, the tool...
Chapter 15: 1. Shear plane angle and shear strain: In an orthogonal cutting operation, the tool has a rake angle = 16°. The chip thickness before the cut = 0.32 mm and the cut yields a deformed chip thickness = 0.72 mm. Calculate (a) the shear plane angle and (b) the shear strain for the operation. 2. Shear strength: The cutting force and thrust force have been measured in an orthogonal cutting operation to be 301 lb and 291 lb,...
In an orthogonal metal cutting test in a turning operation, the following conditions were recorded cutting...
In an orthogonal metal cutting test in a turning operation, the following conditions were recorded cutting speed = 160 m/min, feed = 0.28 mm/rev, width of cut-2.4 mm, rake angle-70. After the cut, the deformed chip thickness 0.45 mm, cutting force-950 N and thrust 400 N. Determine (a) shear plane angle, (b) The friction angle, (c) The specific energy of workpiece material, (d) The shear stress on shear plane (e) The friction force (f) The shear strain during the deformation...
Flank wear data were collected in a series of turming tests using a coated carbide tool...
Flank wear data were collected in a series of turming tests using a coated carbide tool on hardened alloy steel at a feed of 0.3 mm/rev and a depth of 3.6 mm. At a speed of 120 m/min, flank wear 0.12 mm at 1 min, 0.27 mm at 5 min, 0.5 mm at 10 min, 0.58 mm at 15 min, 0.73 at 20 min, and 0.97 mm at 25 min. At a speed of 160 m/min, flank wear 0.2 mm...
Ur thhe spécific for shear, u, and the specific heat of the material. Hence, temperature risc ene...
ur thhe spécific for shear, u, and the specific heat of the material. Hence, temperature risc ene machining materials with high strengt cates. The temperature rise at the tool-chip interface is, of course, also a fiu cocfficient of friction. Flank wear (see Section 8.3 and Fig. 8.20a) isction of source of heat, caused by rubbing of the tool on the machined surface. those of the workpiece. generated in the shear plane is a functioll UI material. Hence, temperature rise is...
How much does a sleeping bag cost? Let's say you want a sleeping bag that should...
How much does a sleeping bag cost? Let's say you want a sleeping bag that should keep you warm in temperatures from 20°F to 45°F. A random sample of prices ($) for sleeping bags in this temperature range is given below. Assume that the population of x values has an approximately normal distribution. 40 85 90 85 90 50 30 23 100 110 105 95 105 60 110 120 95 90 60 70 (a) Use a calculator with mean and...
How much does a sleeping beg cost? Let's say you want a sleeping bag that should...
How much does a sleeping beg cost? Let's say you want a sleeping bag that should keep you warm in temperatures frem range is given below. Assume that the population of x values has an approximately normal distribution. i 20°F to 45'F. A random sample of prices (8) for sieeping bags in ehes temperature 45 55 90 120 0 90 30 23 100110 10595 105 60110 12095 90 60 () Use a cakculator with -$ 81.15 -$ 29.72 mean and...
a) A workpiece (φ-75 mm, 1 275 mm) is machined using turning at a feed rate of 0.25 mm/rev. At a cutting speed- 3.5 m/s, the turning tool is ineffective after machining 3 parts, and at a cutting speed = 2.5 m/s, the turning tool is effective for producing 20 parts. Calculate the Cutting Speed that will allow 30 parts to be machined between tool changes [20 marks] b) An aluminium alloy workpiece (tensile strength - 325 N/mm2 and yield...
Question 1 A turning operation is carried out on aluminum. Based on the specific energy values in Table 20.2, determine material removal rate and cutting power in the operation under the following sets of cutting 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 4.0 mm. Question 2 Consider a turning operation performed on steel whose hardness 225 HB at a cutting speed...
During a turning operation on a lathe using a grooved tool, the
following forces were recorded:
Group
1
2
3
4
5
6
Feed force, Fx (kN)
1.70
1.68
1.59
1.75
1.67
1.64
Radial force, Fy (kN)
1.32
1.39
1.44
1.42
1.45
1.38
Tangential force, Fz (kN)
2.18
2.37
2.38
2.32
2.29
2.33
The machine set-up includes a feed (s) of 0.24 mm/rev. and the
depth of cut (d) of 2.5 mm.
Tool rake angle ()
= - 6 deg....
Problem 1 Consider the drilling of Feature 3 (Thru Hole) on the flashlight head (Figure 1) Assume the feed of the drilling opcration (i.e., the distance the drill penetrates per unit revolution) is,f= 0.01 inrev. " a) Calculate the material removal rate (in in3/s or mm3/s). b) Use the Taylor Tool Life equation to estimate the tool life (in minutes) for this operation. Use Table 1 to pick appropriate values of C and n (the flashlight material is aluminum and...
In an orthogonal metal cutting test in a turning operation, the following conditions were recorded cutting speed = 160 m/min, feed = 0.28 mm/rev, width of cut-2.4 mm, rake angle-70. After the cut, the deformed chip thickness 0.45 mm, cutting force-950 N and thrust 400 N. Determine (a) shear plane angle, (b) The friction angle, (c) The specific energy of workpiece material, (d) The shear stress on shear plane (e) The friction force (f) The shear strain during the deformation...
Flank wear data were collected in a series of turming tests using a coated carbide tool on hardened alloy steel at a feed of 0.3 mm/rev and a depth of 3.6 mm. At a speed of 120 m/min, flank wear 0.12 mm at 1 min, 0.27 mm at 5 min, 0.5 mm at 10 min, 0.58 mm at 15 min, 0.73 at 20 min, and 0.97 mm at 25 min. At a speed of 160 m/min, flank wear 0.2 mm...
ur thhe spécific for shear, u, and the specific heat of the material. Hence, temperature risc ene machining materials with high strengt cates. The temperature rise at the tool-chip interface is, of course, also a fiu cocfficient of friction. Flank wear (see Section 8.3 and Fig. 8.20a) isction of source of heat, caused by rubbing of the tool on the machined surface. those of the workpiece. generated in the shear plane is a functioll UI material. Hence, temperature rise is...
How much does a sleeping beg cost? Let's say you want a sleeping bag that should keep you warm in temperatures frem range is given below. Assume that the population of x values has an approximately normal distribution. i 20°F to 45'F. A random sample of prices (8) for sieeping bags in ehes temperature 45 55 90 120 0 90 30 23 100110 10595 105 60110 12095 90 60 () Use a cakculator with -$ 81.15 -$ 29.72 mean and...
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