Chapter 18 BULK DEFORMATION PROCESSES IN METAL WORKIING
In which of the following extrusion operations is friction a factor in determining the extrusion force: (a) direct extrusion or (b) indirect extrusion?
a
Production of tubing is possible in indirect extrusion but not in direct extrusion: (a) true or (b) false?
false
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
Which of the following stress or strength parameters is used in the computation of rolling force (one best answer): (a) average flow stress, (b) compression strength, (c) final flow stress, (d) tensile strength, or (e) yield strength?
a
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?
a
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) roll velocity, (d) stock thickness, (e) strain, and (f) strength coefficient of the work metal?
a and b
Which of the following rolling mill types are associated with relatively small diameter rolls in contact 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?
a and c
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?
a, b, e, h
Which of the following bulk deformation processes are involved in the production of nails for lumber construction (three best answers): (a) bar and wire drawing, (b) extrusion, (c) flashless forging, (d) impression die forging, (e) rolling, and (f) upsetting?
a, c, e
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, and (g) upsetting?
a, c, g
Which of the following are basic bulk deformation processes in metal forming (three correct answers): (a) bar drawing, (b) blanking, (c) deep drawing, (d) extrusion, (e) forging, and (f) stamping?
a, d, e
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) reverse extrusion?
a, e
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?
a, e, f
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?
b
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?
b
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?
b
Furnaces used to heat cast steel ingots to achieve a uniform temperature throughout prior to rolling are called which of the following (one best answer): (a) annealing furnaces, (b) heat treating ovens, (c) soaking pits, or (d) tempering furnaces?
c
Which of the following stress or strength parameters is used in the computation of the maximum force 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?
c
In metal extrusion, the extrusion ratio is also known by which of the following terms (one best answer): (a) area reduction, (b) draft, (c) reduction, or (d) reduction ratio?
d
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?
d
