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WorksheetsCutting-Tool Materials and Cutting Fluids
Total questions: 15
Worksheet time: 18mins
Cutting-tool are subjected to:
high temperatures
high contact stress
rubbing along the tool–chip interface and along the machined surface
wear resistance
The cutting-tool material must possess the following characteristics,EXCEPT...
Chemical stability and inertness
Wear resistance
Toughness and impact strength
Hot hardness
high contact stress
Types of cuttng fluids:
Oils
Emulsions
Semisynthetics
Synthetics
Water
Methods of Cutting-fluid Application in proper step is:
Flooding-Mist-High Pressure System-Through the cutting tool system
Mist-High Pressure System-Through the cutting tool system-Flooding
Flooding-Through the cutting tool system-Mist-High Pressure System-
The two major groups of carbides used for machining are:
tungsten carbide
titanium carbide
Cast-cobalt Alloys
Characteristics of cast cobalt alloys:
good wear resistance
can maintain their hardness at elevated temperatures
not tough as high-speed steels
high hardness over a wide range of temperatures
manufacturing these tools by using powder-metallurgy techniques such as:
Functionally Graded Carbides
Micrograin Carbides
Tungsten Carbide
Titanium Carbide
Coatings have unique properties, such as:
Lower friction
Higher adhesion
Higher resistance to wear and cracking
Higher hot hardness and impact resistance
Acting as a diffusion barrier
Characteristics of Cubic boron nitride:
small sizes without a substrate
its chemically inert to iron and nickel at elevated temperatures
Its resistance to oxidation is high
it is particularly suitable for cutting hardened ferrous
high wear resistance
diamond as a cutting tool has highly desireable properties such as:
high wear resistance
low friction
it has ability to maintain a sharp cutting edge.
low wear resistance
(a) are applied as a thin coating, usually in an attempt to obtain a reasonable tool life without the use of a coolant
(a) is used when a good surface finish and dimensional accuracy are required, particularly with soft nonferrous alloys and abrasive nonmetallic and metallic materials.
In this process, ions are introduced into the surface of the cutting tool, improving its surface properties. What is the name of process?
(a)
Mention three kind of coating methods
(a) tools have very high abrasion resistance and hot hardness.
