(a) Research the cutting tool alternatives which could be used for such operation. What are the parameters that could be optimized in the geometry of the cutting tool (The seven elements of tool geometry for a single point cutting tool)? What are some of the tool life criteria used in production machining operations? (b) In a turning operation on stainless steel with hardness = 200 HB, the cutting speed = 250 m/min, feed = 0.3 mm/rev, and depth of cut = 8 mm. How much power will the lathe draw in performing this of 7 operation if it's mechanical efficiency = 95%. Use Table below to obtain the annropriate specific enerey value

(a) Research the cutting tool alternatives which could be used for such operation. What are the parameters that could be optimized in the geometry of the cutting tool (The seven elements of tool geometry for a single point cutting tool)? What are some of the tool life criteria used in production machining operations? (b) In a turning operation on stainless steel with hardness = 200 HB, the cutting speed = 250 m/min, feed = 0.3 mm/rev, and depth of cut = 8 mm. How much power will the lathe draw in performing this of 7 operation if it's mechanical efficiency = 95%. Use Table below to obtain the annropriate specific enerey value

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 an orthogonal cutting test with a bar of 75 mm diameter is reduced to 73 mm by using a HSS tool with arake angle  = 10o, following observations were made: length of the chip, lc = 69.44 mm, cutting ratio r =0.3, the horizontal component of the cutting force, FH = 1450 N, and the vertical component of the cuttingforce, FV = 850 N. The various parameters recorded in this cutting operation are: depth of cut, d = 2 mm;feed rate, f = 0.3 mm/rev, cutting speed, V = 60 m/min. Using Merchant’s theory calculate the following:1) Friction force along rake face2) Normal force acting on rake face3) Shear force along the shear plane4) Normal force acting on shear plane5) The percentage error in shear angle predicted by Merchant’s theory6) Shear velocity7) Chip velocity8) Total work done9) The shear work proportion out of the total work done10) The friction work proportion out of the total work done
a) Define specific energy for plane strain machining (cutting). b) In plane-strain orthogonal machining, the two main sources of energy dissipation are deformation along the shear plane (~70%) and friction at the tool-chip contact along the rake face (~30%). Consider plane-strain machining of a rigid perfectly-plastic work material whose uniaxial yield stress is 700 MPa, and is independent of strain rate and temperature. A tool of zero-degree rake angle is employed. Measurements showed the (deformed) chip thickness to be twice that of the undeformed chip thickness. Based on the aforementioned distribution of energy, estimate the specific energy for this process.
A turning operation is performed with HSS tooling on mild steel, with Taylor tool life parameters n = 0.12, C = 60 m/min. Work part length = 450 mm and diameter = 80 mm. Feed = 0.20 mm/rev. Handling time per piece = 4.0 min, and tool change time = 1.5 min. Cost of machine and operator = $27/hr, and tooling cost = $2 per cutting edge. Find the a. cutting speed for maximum production rate and b. cutting speed for minimum cost Equations used n *-=c(")* Vmax = C 1-n Tt Vmin = C =c(₁" n 1 n Co n CoTt + Ct n
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.
1. Most common instrument used in the mechanical gages is the dial indicator, which of the following applications cannot be measured by the dial indicator? (a) All of them (b) Perpendicularity (c) Runout (d) Circularity (e) Roughness 2. The main mechanism for the flank wear on the single point cutting tool is: (a) Oxidation wear (b) Adhesion wear (c) None of them (d) Diffusion wear (e) Plastic deformation 3. Higher cutting speeds and temperatures are the main mechanism of the following tool wear mechanism: (a) Diffusion wear (b) Abrasion wear (c) None of them (d) Adhesion wear (e) Plastic Deformation
During turning tests, using a cemented carbide tool resulted in a 1‑min tool life at a cutting speed = 4.8 m/s and a 22‑min tool life at a speed = 2.0 m/s. (a) Find the n and C
In a production turning operation, the workpart is 60 mm in diameter and 500 mm long. A feed of 0.75 mm/rev is used in the operation. If cutting speed-9 m/s, the tool must be changed every 4 workparts; But if cutting speed=5 m/s, the tool can be used to produce 50 pieces between tool changes. Determine the Taylor tool life equation for this job. (use the equations given below for solution) L Tm- 1,= Nf N AD, vT" = C %3| AD,L Tm fv
The results of machining steel with two grades of tool material are given below: Taylor's Exponent Cutting speed for 1(one) minuto Tool A B tool life metres/min 100 120 0.20 0.25 (i) For a 400 minute tool life, which tool is recommended and why? (ii) The tool changing time for the preferred tool is 15 minutes which cutting speed has to be chosen from the available speeds 45 m/min; 5 m/min.
Q4 Tool life of a turning tool is given by VT0.12xfP.7xd3=C at a cutting speed (V) of 25m/min, feed(f) 0.25 mm/rev and job diameter(d) 4 mm, the tool life was 53 minutes. Calculate (i) Tool life if cutting speed increased by 20 % [3]
Problem 2. (Determining Cutting Speeds in Machining Economics) A turning operation is performed with HSS tooling on mild steel, with Taylor tool life parameters n = 0.12, C = 60 m/min. Work part length = 450 mm and diameter = 80 mm. Feed = 0.20 mm/rev. Handling time per piece = 4.0 min, and tool change time = 1.5 min. Cost of machine and operator = $27/hr, and tooling cost = $2 per cutting edge. Find the a. cutting speed for maximum production rate = 44.997m/min. b. cutting speed for minimum cost = 38.143m/min. Problem 3. (Production Rate and Cost in Machining Economics) For the two cutting speeds computed in problem 2, determine: a. the hourly production rate and b. the cost per piece. Need help with problem 3 already done problem 2
Problem 2. (Determining Cutting Speeds in Machining Economics) A turning operation is performed with HSS tooling on mild steel, with Taylor tool life parameters n = 0.12, C = 60 m/min. Work part length = 450 mm and diameter = 80 mm. Feed = 0.20 mm/rev. Handling time per piece = 4.0 min, and tool change time = 1.5 min. Cost of machine and operator = $27/hr, and tooling cost = $2 per cutting edge. Find the a. cutting speed for maximum production rate and b. cutting speed for minimum cost Problem 3. (Production Rate and Cost in Machining Economics) For the two cutting speeds computed in problem 2, determine: the hourly production rate and a. b. the cost per piece.
Rake angle=20 degree, Depth of cut=6 mm, Feed rate =0.25mm/rev,Cutting speed=0.6 m/s, chip length before cutting=29.4mm, vertical cutting force= 1050 NHorizontal cutting force=630, chip length after cutting=12.9Using Merchant’s analysis calculate(a) direction and magnitude of resultant force(b) friction force and friction angle(c) shear plane angle