Tool Materials in Common Use Flashcards
Name three materials used to make tools
high carbon steel, high-speed steel (H.S.S.), cemented carbides (tungsten carbides)
What does high carbon steel contain?
Contains 1 -1.4% carbon with some addition of chromium and tungsten to improve wear resistance.
At what temperature does high carbon steel begin to lose its hardness?
The steel begins to lose its hardness at about 250° C,
What is high carbon steel not favoured in?
It is not favoured for modern machining operations where high speeds and heavy cuts are usually employed.
What is high speed steel’s hot hardness value?
Steel, which has a hot hardness value of about 600° C,
What properties does H.S.S. possess?
It has a hot hardness value of 600° C, possesses good strength and shock-resistant properties.
What is high speed steel normally used for?
It is commonly used for single-point lathe cutting tools and multi-point cutting tools such as drills, reamers and milling cutters.
What are cemented carbides?
An extremely hard material made from tungsten powder.
What form are carbide tools usually used?
Carbide tools are usually used in the form of brazed or clamped tips.
What are the advantages of cemented carbides?
High cutting speeds may be used and materials difficult to cut with HSS may be readily machined using carbide tipped tool.
