Deck 19: Cutting Tool Technology

Question 1

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
C)temperature failure

Answer 1

gradual wear

Question 2

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
E)notch wear

Answer 2

crater wear
flank wear

Question 3

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
F)work material hardness

Answer 3

cutting speed
tool life

Question 4

Of the following cutting conditions, which one has the greatest effect on tool wear:

A)cutting speed
B)depth of cut
C)feed

Question 5

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
F)wear resistance

Question 6

As an alloying ingredient in high-speed steel, tungsten serves which of the following functions (two best answers):

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
F)increases toughness

Question 7

As an alloying ingredient in high-speed steel, chromium serves which of the following functions (three best answers):

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
F)increases toughness

Question 8

Cast cobalt alloys typically contain which of the following as their main ingredients (three best answers):

A)aluminum
B)cobalt
C)chromium
D)iron
E)nickel
F)steel
G)tungsten

Question 9

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
E)WC

Question 10

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
E)increases wear resistance

Question 11

Steel-cutting grades of cemented carbide are typically characterized by which of the following ingredients (three correct answers):

A)Co
B)CrC
C)Mo
D)Ni
E)TiC
F)WC

Question 12

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
D)C7

Question 13

Which of the following processes are used to provide very 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
E)spray painting

Question 14

Which one of the following materials has the highest hardness:

A)aluminum oxide
B)cubic boron nitride
C)high-speed steel
D)titanium carbide
E)tungsten carbide

Question 15

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
E)tungsten carbide

Question 16

Sialon is a cutting tool material containing which of the following as its principal ingredients (two correct answers):

A)aluminum oxide
B)cubic boron nitride
C)silicon carbide
D)silicon nitride
E)titanium nitride
F)tungsten carbide

Question 17

How many elements of tool geometry are required to completely specify a single-point tool (one correct answer):

A)two
B)five
C)seven
D)eight
E)ten

Question 18

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:

Question 19

Which of the following drill types would be the most likely choice to drill a hole with a 100 mm (4.0 in) diameter (one best answer):

A)gun drill
B)spade drill
C)straight-flute drill
D)twist drill

Question 20

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
E)wash away chips