Flank wear data were collected in a series of turming tests using a coated carbide 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,...
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 3 Suppose a cemented carbide tool with a brazed insert is used to turn a steel workpart that is 375 mmlong and 62.5 mnm in diameter. The parameters in the Taylor equation are: n = 0.25 and C = 300 (m/min) for a feed of 0.30 mm/rev. The price of the brazed insert N$30.00, and it can be used a total of 15 times before it must be scrapped. The tool change time for the regrindable tooling 3.0 min....
Turning tests have resulted in 5-min tool life at cutting speed=160 m/min and a 41-min tool life at speed=100 m/min. a) If you want the tool life to be at least 20 mins. What is the maximum cutting speed you can use? b) The outside diameter of a cylinder made of titanium alloy is to be turned. The starting diameter is 200 mm and the length is 800 mm. The feed is 0.2 mm/rev and the depth of cut is...
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....
02: A bar of 60 mm diameter and length of 3 meter is used to produce 500 pieces on a center lathe having the following characteristics: . Maximum rotational speed .Minimum rotational speed .Number of speeds Lathe overall efficiency The turning process is performed at 40 m/min cutting velocity. 0.5 mm/rev longitudinal feed, 0.25 mm/rev transverse feed and 2 mm depth of cut REQUIRED 1. Calculate the TWELVE rotational speeds in rpm. 2. What rotational speed would you choose? 3....
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...
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...