Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
|
20.1 Most sheet metalworking operations are performed as which one of the following: (a) cold working,(b) hot working, or (c) warm working? |
Answer. (a). |
|
|
20.2 In a sheet-metal-cutting operation used to produce a flat part with a hole in the center, the part itselfis called a blank, and the scrap piece that was cut out to make the hole is called a slug: (a) true or (b)false? |
Answer. (a). |
|
|
20.3 As sheet-metal stock hardness increases in a blanking operation, the clearance between punch anddie should be (a) decreased, (b) increased, or (c) remain the same? |
Answer. (b). |
|
|
20.4 A circular sheet-metal slug produced in a hole punching operation will have the same diameter as(a) the die opening or (b) the punch? |
Answer. (a). |
|
|
20.5 The cutting force in a sheet-metal blanking operation depends on which mechanical property of themetal (one correct answer): (a) compressive strength, (b) modulus of elasticity, (c) shear strength,(d) strain rate, (e) tensile strength, or (f) yield strength? |
Answer. (d). |
|
|
20.6 Which of the following descriptions applies to a V-bending operation as compared to an edgebendingoperation (two best answers): (a) costly tooling, (b) inexpensive tooling, (c) limited to 90bends or less, (d) used for high production, (e) used for low production, and (f) uses a pressure padto hold down the sheet metal? |
Answer. (b) and (e). |
|
|
20.7 Sheet-metal bending involves which of the following stresses and strains (two correct answers): (a)compressive, (b) shear, and (c) tensile? |
Answer. (a) and (c). |
|
|
20.8 Which one of the following is the best definition of bend allowance: (a) amount by which the die islarger than the punch, (b) amount of elastic recovery experienced by the metal after bending, (c)safety factor used in calculating bending force, or (d) length before bending of the straight sheetmetalsection to be bent? |
Answer. (d). |
|
|
20.9 Springback in a sheet-metal-bending operation is the result of which one of the following: (a) elasticmodulus of the metal, (b) elastic recovery of the metal, (c) overbending, (d) overstraining, or (e)yield strength of the metal? |
Answer. (b). |
|
|
20.10 Which of the following are variations of sheet-metal-bending operations (two best answers): (a)coining, (b) flanging, (c) hemming, (d) ironing, (e) notching, (f) shear spinning, (g) trimming, and(h) tube bending? |
Answer. (b) and (c). |
|
|
20.11 The following are measures of feasibility for several proposed cup-drawing operations; which of theoperations are likely to be feasible (three best answers): (a) DR = 1.7, (b) DR = 2.7, (c) r = 0.35, (d)r = 0.65, and (e) t/D = 2%? |
Answer. (a), (c), and (e). |
|
|
20.12 The holding force in drawing is most likely to be (a) greater than, (b) equal to, or (c) less than themaximum drawing force? |
Answer. (c). |
|
|
20.13 Which one of the following stamping dies is the most complicated: (a) blanking die, (b)combination die, (c) compound die, (d) edge-bending die, (e) progressive die, or (f) V-bending die? |
Answer. (e). |
|
|
20.14 Which one of the following press types is usually associated with the highest production rates insheet-metal-stamping operations: (a) adjustable bed, (b) open back inclinable, (c) press brake, (d)solid gap, or (e) straight-sided? |
Answer. (b). |
|
|
20.15 Which of the following processes are classified as high-energy-rate forming processes (two bestanswers): (a) electrochemical machining, (b) electromagnetic forming, (c) electron beam cutting,(d) explosive forming, (e) Guerin process, (f) hydroforming, (g) redrawing, and (h) shear spinning? |
Answer. (b) and (d). |
