Carbide tooling Flashcards
What is the basic carbide mixture?
94 parts tungsten carbide
6 parts Co
What are the 4 basic cemented carbide combinations?
Tungsten carbide
Titanium Carbide
Tantalum Carbide
Cobalt
How are cemented carbides made?
Made by compressing metal powders and sintering the resulting shape
What is sintering?
The process of compacting and forming a solid mass of material by heat and/or pressure without melting it to the point of liquidation.
What does cobalt do in a sintering process?
Acts as a binder and increases tool toughness while reducing wear resistanc
True or false: carbide tool’s weak point is their relatively weak compressive strength
False. Carbide tools have good compressive strength
What benefits does a titanium nitride coating give to a carbide cutter?
Acts as a lubricant, reducing friction which in turn, reduces chattering.
What is the benefit of a titanium carbide coating on a carbide cutter?
Titanium carbide coating increases wear resistance.
What is the benefit of aluminum oxide coatings for carbide tooling?
Aluminum oxide coatings help resist chemical reactions
What kind of grinding wheels are used to grind carbide tooling?
Silicon carbide and diamond grit grinding wheels are used to grinding carbide tooling.
A chip splitter on a cutting edge can give what benefits when taking a cut?
A chip splitter reduces cutting forces, gives smother cutting action, and promotes longer tool life.
What would help reduce the chance of cratering when cutting with an insert?
Coating the insert could help
What are the three basic rake angles?
Positive
Neutral
Negative
What is the first letter mean in the carbide insert identification system?
Shape
C - 80 deg. Diamond D - 55 deg. Diamond S - square T - triangle V - 35 deg. Diamond
What does the second letter of the carbide insert identification system mean?
Rake angle clearance
N - negative clearance angle
P - positive clearance angle
