CH 15 Multiple Choice Q's

15.20 Johnson's formula is associated with which one of the four bulk deformation processes: (a) bar and wire drawing, (b) extrusion, (c) forging, and (d) rolling?

Extrusion

15.11 Flash in impression die forging serves no useful purpose and is undesirable because it must be trimmed from the part after forming: (a) true or (b) false?

False The flash has friction against the die gap surface which helps contain the metal in the die cavity.

15.14Production of tubing is possible in indirect extrusion but not in direct extrusion: (a) true or (b) false?

False tubing is possible for both

15.2 Rolling is a bulk deformation process in which the thickness of the work is reduced by compressive forces exerted by two opposing rolls: (a) true or (b) false?

True

15.17 In which of the following extrusion operations is friction a factor in determining the extrusion force: (a) direct extrusion or (b) indirect extrusion?

direct extrusion

15.8 Production of pipes and tubes is associated with which of the following bulk deformation processes: (a) extrusion, (b) hobbing, (c) ring rolling, (d) roll forging, (e) roll piercing, (f) tube sinking, and (g) upsetting?

extrusion, roll piercing, tube sinking

15.9 Which of the following stress or strength parameters is used in the computation of the maximum force in a forging operation: (a) average flow stress, (b) compression strength, (c) final flow stress, (d) tensile strength, or (e) yield strength?

final flow stress

15.15 In metal extrusion, the extrusion ratio is also known by which of the following terms: (a) area reduction, (b) draft, (c) reduction, or (d) reduction ratio?

reduction ratio

15.4 Furnaces used to heat cast steel ingots to achieve a uniform temperature throughout prior to rolling are called which of the following: (a) annealing furnaces, (b) heat treating ovens, (c) soaking pits, or (d) tempering furnaces?

soaking pits

15.18 Theoretically, the maximum reduction possible in a wire drawing operation, under the assumptions of a perfectly plastic metal, no friction, and no redundant work, is which one of the following: (a) zero, (b) 0.63, (c) 1.0, or (d) 2.72?

0.63

15.3 The starting workpiece in hot rolling of steel plate and sheet stock is which one of the following: (a) bar stock, (b) billet, (c) bloom, (d) slab, or (e) wire stock?

Slab

15.16 Which of the following stress or strength parameters is used in the computation of the force in an extrusion operation (one best answer): (a) average flow stress, (b) compression strength, (c) final flow stress, (d) tensile strength, or (e) yield strength?

average flow stress

15.6 Which of the following stress or strength parameters is used in the computation of rolling force: (a) average flow stress, (b) compression strength, (c) final flow stress, (d) tensile strength, or (e) yield strength?

average flow stress

15.13 Which of the following are alternative names for indirect extrusion: (a) backward extrusion, (b) direct extrusion, (c) forward extrusion, (d) impact extrusion, and (e) reverse extrusion?

backward extrusion, reverse extrusion

15.19 Which of the following bulk deformation processes are involved in the production of nails for lumber construction: (a) bar and wire drawing, (b) extrusion, (c) flashless forging, (d) impression die forging, (e) rolling, and (f) upsetting?

bar and wire drawing, flashless forging, impression die forging

15.1 Which of the following are basic bulk deformation processes in metal forming: (a) bar drawing, (b) blanking, (c) deep drawing, (d) extrusion, (e) forging, and (f) stamping?

bar drawing, extrusion, forging

15.7 Which of the following rolling mill types are associated with relatively small diameter rolls in contact with the work: (a) cluster mill, (b) continuous rolling mill, (c) four-high mill, (d) reversing mill, and (e) three-high configuration?

cluster mill, four-high mill

15.5 The maximum possible draft in a rolling operation depends on which of the following parameters: (a) coefficient of friction between roll and work, (b) roll diameter, (c) roll velocity, (d) stock thickness, (e) strain, and (f) strength coefficient of the work metal?

coefficient of friction between roll and work, roll diameter

15.10 Which of the following operations are closely related to open-die forging: (a) cogging, (b) flashless forging, (c) fullering, (d) impression-die forging, (e) Mannesmann process, (f) precision forging, and (g) upsetting?

cogging, fullering, upsetting

15.12 Which of the following are classified as forging operations: (a) coining, (b) fullering, (c) impact extrusion, (d) roll piercing, (e) swaging, (f) thread rolling, (g) trimming, and (h) upsetting?

coining, fullering, upsetting, swaging