DeGarmo's Materials and Processes in Manufacturing
12th Edition
ISBN: 9781118987674
Author: J. T. Black, Ronald A. Kohser
Publisher: WILEY
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Textbook Question
Chapter 30, Problem 19RQ
What effect would increasing the voltage have on the metal removal rate in electrodischarge machining? Why?
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Chapter 30 Solutions
DeGarmo's Materials and Processes in Manufacturing
Ch. 30 - How do the MRRs for most NTM processes compare to...Ch. 30 - What are the steps in chemical machining using...Ch. 30 - In chemical machining, should the etchant be...Ch. 30 - What are the advantages of chemical blanking over...Ch. 30 - How are multiple depths of cut (steps) produced by...Ch. 30 - Would it be feasible to produce a groove 2 mm wide...Ch. 30 - A drawing calls for making a groove 23 mm wide and...Ch. 30 - Could an ordinary steel weldment be chemically...Ch. 30 - How could you produce a tapered section by...Ch. 30 - What is the principal application of...
Ch. 30 - How is ECM related to chemical machining?Ch. 30 - What effect does work material hardness have on...Ch. 30 - What is the principal cause of tool wear in ECM?Ch. 30 - Would electrochemical grinding be a suitable...Ch. 30 - Upon what factors does the metal removal rate...Ch. 30 - Why is the tool insulated in the ECM schematic?Ch. 30 - What is the nature of the surface obtained by...Ch. 30 - What is the principal advantage of using a moving...Ch. 30 - What effect would increasing the voltage have on...Ch. 30 - If a metal part is quite brittle and the part will...Ch. 30 - If you had to make several holes in a large number...Ch. 30 - Prob. 22RQCh. 30 - Explain (using a little physics and metallurgy)...Ch. 30 - Prob. 24RQCh. 30 - What are some possible defects that can result...Ch. 30 - What are some other uses for the laser other than...Ch. 30 - How does the laser produce coherent light...Ch. 30 - What is ablation?Ch. 30 - What is an excimer?Ch. 30 - In Figure 30.16, what is the protective tape...Ch. 30 - Why is the EBM process done in a vacuum?Ch. 30 - What is the major problem with the redesigned cap...
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- Problem 1. (Electrochemical Machining) An ECM operation is used to cut a hole into a plate of stainless steel that is 10 mm thick. The hole has a rectangular cross section, 15 mm by 25 mm. The operation is accomplished at a current = 1300 amps. Efficiency is 97%. Determine the feed rate and time to cut through the plate. The specific removal rate C for stainless steel = 2.46 x 10-² mm³/A-s. Problem 2. (Electric Discharge Machining) Iron is to be machined in an EDM operation. If discharge current = 30 amps, what is the expected metal- removal rate? The melting point of iron is known to be 1539°C, and the metal removal rate constant of proportionality K = 664 in Sl units (5.08 in U.S. customary units)arrow_forwardManufacuring processes List the forces acting on a chip during machining operation?arrow_forwardIn 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.arrow_forward
- Question : List and briefly explain the four basic mechanisms by which material removal in USM can take place. USM - Ultra sonic machiningarrow_forwardIn 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 donearrow_forward(c) Figure 11 shows a hybrid machining process that requires two or more process steps to produce a high-quality product, especially in the automotive industry. i. Identify the hybrid machining process in Figure 11. ii. Justify your selection in (i). iii. Explain the working principle of your answer in (i). Тool Nozzle Workpiece Pulse Power NC Table Supply Figure 11: Hybrid machining processarrow_forward
- What is surface roughness? Surface finish is one of the most important measures for determining the quality of products in machining. Explain in some details.arrow_forwardWhat is dielectric? Discuss the impact of dielectric properties on machining characteristics in EDM.arrow_forwardI need the answer as soon as possiblearrow_forward
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