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16 Cards in this Set
- Front
- Back
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19.1 The starting workpiece in steel hot rolling of plate and sheet stock is which of the following (onebest answer): (a) bar stock, (b) billet, (c) bloom, (d) slab, or (e) wire stock? |
Answer. (d). |
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19.2 The maximum possible draft in a rolling operation depends on which of the following parameters(two correct answers): (a) coefficient of friction between roll and work, (b) roll diameter, (c) rollvelocity, (d) stock thickness, (e) strain, and (f) strength coefficient of the work metal? |
Answer. (a) and (b). |
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19.3 Which of the following stress or strength parameters is used in the computation of rolling force (onebest answer): (a) average flow stress, (b) compression strength, (c) final flow stress, (d) tensilestrength, or (e) yield strength? |
Answer. (a). |
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19.4 Which of the following rolling mill types are associated with relatively small diameter rolls incontact with the work (two correct answers): (a) cluster mill, (b) continuous rolling mill, (c)four-high mill, (d) reversing mill, and (e) three-high configuration? |
Answer. (a) and (c). |
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19.5 Production of pipes and tubes is associated with which of the following bulk deformation processes(three correct answers): (a) extrusion, (b) hobbing, (c) ring rolling, (d) roll forging, (e) roll piercing,(f) tube sinking, and (g) upsetting? |
Answer. (a), (e), and (f). |
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19.6 Which of the following stress or strength parameters is used in the computation of the maximumforce in a forging operation (one best answer): (a) average flow stress, (b) compression strength, (c)final flow stress, (d) tensile strength, or (e) yield strength? |
Answer. (c). |
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19.7 Which of the following operations are closely related to open-die forging (three best answers): (a)cogging, (b) flashless forging, (c) fullering, (d) impression-die forging, (e) Mannesmann process, (f)precision forging, (g) soaking, and (h) upsetting? |
Answer. (a), (c), and (h). |
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19.8 Flash in impression die forging serves no useful purpose and is undesirable because it must betrimmed from the part after forming: (a) true or (b) false? |
Answer. (b). Flash causes build-up of pressure inside the die, which forces the work metal to fill thedie cavity. |
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19.9 Which of the following are classified as forging operations (four correct answers): (a) coining, (b)fullering, (c) impact extrusion, (d) roll piercing, (e) swaging, (f) thread rolling, (g) trimming, and (h)upsetting? |
Answer. (a), (b), (e), and (h). Trimming, answer (g), although associated with forging, is a cuttingoperation. |
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19.10 Which of the following are alternative names for indirect extrusion (two correct answers): (a)backward extrusion, (b) direct extrusion, (c) forward extrusion, (d) impact extrusion, and (e) reverseextrusion? |
Answer. (a) and (e). |
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19.11 The production of tubing is possible in indirect extrusion but not in direct extrusion: (a) true or (b)false? |
Answer. (b). Tube and pipe cross sections can be produced by either direct or indirect extrusion. |
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19.12 Which of the following stress or strength parameters is used in the computation of the force in anextrusion operation (one best answer): (a) average flow stress, (b) compression strength, (c) finalflow stress, (d) tensile strength, or (e) yield strength? |
Answer. (a). |
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19.13 In which of the following extrusion operations is friction a factor in determining the extrusion force(one best answer): (a) direct extrusion or (b) indirect extrusion? |
Answer. (a). |
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19.14 Theoretically, the maximum reduction possible in a wire drawing operation, under the assumptionsof a perfectly plastic metal, no friction, and no redundant work, is which of the following (oneanswer): (a) zero, (b) 0.63, (c) 1.0, or (d) 2.72? |
Answer. (b). |
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19.15 Which of the following bulk deformation processes are involved in the production of nails forlumber construction (three best answers): (a) bar and wire drawing, (b) extrusion, (c) flashlessforging, (d) impression die forging, (e) rolling, and (f) upsetting? |
Answer. (a), (c), and (d). Bar stock is rolled, and then drawn into wire stock. Upset forged is used toform the nail head. |
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19.16 Johnson's formula is associated with which one of the four bulk deformation processes: (a) bar andwire drawing, (b) extrusion, (c) forging, and (d) rolling? |
Answer. (b). |
