Manufacturing Processes: Cutting Tool Technology (CH. 22)

Of the following cutting conditions, which one has the greatest effect on tool wear: (a) cutting speed, (b) depth of cut, or (c) feed?

Answer. (a).

Which of the following are the two main types of gradual wear on a cutting tool: (a) clearance wear, (b) crater wear, (c) flank wear, (d) nose wear, and (e) notch wear?

Answer. (b) and (c).

Which of the following is not a common ingredient in cemented carbide cutting tools (two correct answers): (a) Al2O3, (b) Co, (c) CrC, (d) TiC, and (e) WC?

Answer. (a) and (c).

Which of the following are the two main functions of a cutting fluid in machining (two best answers): (a) improve surface finish on the workpiece, (b) reduce forces and power, (c) reduce friction at the tool-chip interface, (d) remove heat from the process, and (e) wash away chips?

Answer. (c) and (d).

Which of the following are the two main functions of a cutting fluid in machining: (a) improve surface finish on the workpiece, (b) reduce forces and power, (c) reduce friction at the tool-chip interface, (d) remove heat from the process, and (e) wash away chips?

Answer. (c) and (d).

How many elements of tool geometry are required to completely specify a single-point tool: (a) two, (b) five, (c) seven, (d) eight, or (e) ten?

Answer. (c).

Which of the following processes are used to provide the thin coatings on the surface of coated carbide inserts (two best answers): (a) chemical vapor deposition, (b) electroplating, (c) physical vapor deposition, (d) pressing and sintering, and (e) spray painting?

Answer. (a) and (c).

23.5 An increase in cobalt content has which of the following effects on WC-Co cemented carbides (two best answers): (a) decreases hardness, (b) decreases transverse rupture strength, (c) increases hardness, (d) increases toughness, and (e) increases wear resistance?

Answer. (a) and (d).

As an alloying ingredient in high-speed steel, tungsten serves which of the following functions (two best answers): (a) forms hard carbides to resist abrasion, (b) improves strength and hardness, (c) increases corrosion resistance, (d) increases hot hardness, and (e) increases toughness?

Answer. (a) and (d).

Sialon is a cutting tool material containing which of the following as its principal ingredients: (a) aluminum oxide, (b) cubic boron nitride, (c) silicon carbide, (d) silicon nitride, (e) titanium nitride, and (e) tungsten carbide?

Answer. (a) and (d).

The basic Taylor tool life equation defines the relationship between which two of the following variables: (a) cutting speed, (b) depth of cut, (c) feed, (d) feed rate, (e) tool life, and (f) work material hardness?

Answer. (a) and (e).

As an alloying ingredient in high-speed steel, chromium serves which of the following functions: (a) depth hardenability during heat treatment, (b) forms hard carbides to resist abrasion, (c) improves strength and hardness, (d) increases corrosion resistance, (e) increases hot hardness, and (f) increases toughness?

Answer. (a), (b), and (d).

Steel-cutting grades of cemented carbide are typically characterized by which of the following ingredients (three correct answers): (a) Co, (b) Fe, (c) Mo, (d) Ni, (e) TiC, and (f) WC?

Answer. (a), (e), and (f).

Chip breakers are frequently used with single-point tools. They work by forcing the chips to curl more tightly than they would naturally be inclined to curl, thus causing them to fracture: (a) true or (b) false?

Answer. (a).

Most ceramic cutting tools are fabricated from which one of the following materials: (a) aluminum oxide, (b) cubic boron nitride, (c) titanium carbide, (d) titanium nitride, or (e) tungsten carbide?

Answer. (a).

Cast cobalt alloys typically contain which of the following main ingredients (three best answers): (a) aluminum, (b) cobalt, (c) chromium, (d) iron, (e) nickel, (f) steel, and (g) tungsten?

Answer. (b), (c), and (g).

Which of the following are the three most important properties of a tool material that are suggested by the three modes of tool failure: (a) ductility, (b) hot hardness, (c) impact resistance, (d) tensile strength, (e) toughness, and (f) wear resistance?

Answer. (b), (e), and (f).

Of the three possible modes by which a cutting tool can fail during a machining operation, which one is most preferable: (a) fracture failure, (b) gradual wear, or (c) temperature failure?

Answer. (b).

Which of the following drill types would be the most likely choice to drill a hole with a 100 mm (4.0 in) diameter: (a) gun drill, (b) spade drill, (c) straight-flute drill, (d) twist drill?

Answer. (b).

Which one of the following materials has the highest hardness: (a) aluminum oxide, (b) cubic boron nitride, (c) high-speed steel, (d) titanium carbide, or (e) tungsten carbide?

Answer. (b).

If you had to select a cemented carbide for an application involving finish turning of steel, which C-grade would you select (one best answer): (a) C1, (b) C3, (c) C5, or (d) C7?

Answer. (d).