Chapter 22 Flashcards
what ceramics are made of. Used as a metallic binder.
Pure Aluminum
low level of chemical reaction with iron that better finish imparted by a cermet.
BUE (built-up edge)
also called sintered (or cemented) carbides because they are manufactured by powder metallurgy techniques. Nonferrous alloys.
Carbides
properly known as satellite tools, are cobalt-rich, chromium-tungsten-carbon cast alloys having properties and applications in the intermediate range between high-speed steel and cemented carbides.
Cast cobalt alloy
cutting tool material
Ceramics
cutting tool material. Ceramic material in a metal binder.
Cermets
one of the most effective coating processes for improving the life and performance of tools are the chemical vapor decomposition (CVD). The CVD process, used to deposit a protective coating onto carbides inserts, has been benefiting the metal removal industry for many years and is now being applied with equal success to steel.
Chemical vapor deposition-
currently the most extensively used tools materials. Cost only about 15-20 percent more than uncoated tools, so a modest improvement in performance can justify the added cost.
Crater tools
wear on the rake face of the tool.
Crater wear-
cutting tool
Cubic boron nitride
acts primarily as a coolant and secondly as a lubricant, reducing the friction effects as the tool/chip interface and the work/flank regions. Also carry away the chips and provide friction (and force) reductions in regions where the bodies of the tools rub against the work piece.
Cutting fluids
what the success in metal cutting depends upon. Available with a variety of properties, performance capabilities, and cost.
Cutting tool material
a predominant wear mode of PCBN tools
Depth-of –cut line (DCL)
the hardest material known.
Diamonds
one of the most important properties for tool steels.
Hot hardness
high-alloy steel was superior to tool steel in that it retains its cutting ability at temperature up to 1100°F, exhibiting good “red hardness”.
High speed steel (HSS)
a much maligned term which has many different meanings but generally refers to the ease with which a metal can be machined to an acceptable surface finish.
Machinability
processes are carried out under a hard vacuum, with the work pieces heated to temperatures in the range of 200 to 485°C (400 to 900°F).
Physical vapor deposition (PVD)
a high temperature high/high pressure process. Consist of a thin layer of fine-grain-size diamond particles sintered together and metallurgically bonded to a cemented carbide substrate.
Polycrystalline
cutting tool material. Has a cutting edge of 100 A or less. Used for precision machining of large mirrors, to machine brass watch faces, to slice biological materials into thin films for viewing in transmission electron microscopes. The ability to form a sharp edge of cleavage.
Single-crystal
also called cemented. Manufactured by powder metallurgy techniques.
Sintered
known as cast cobalt alloy. Are cobalt-rich chromium-tungsten-carbon cast alloys having properties and applications in the intermediate range between high-speed steel and cemented carbides.
Satellite
a chemical reaction done in a chemical vapor (CVD) process.
Titanium nitrate (TiN)
a part on a tool that is said to be “worn out”.
Wear land
