摘要:
According to the present invention there is provided a method of making a cutting insert with a hole for clamping to a tool holder wherein a superhard abrasive material is sintered and simultaneously bonded to a sintered cemented carbide body with a hole inside a container under elevated pressure and temperature conditions. During sintering the hole is filled with a plug which after sintering is removed.
摘要:
A cutting tool for woodworking applications has a cemented carbide substrate and a hard layer bonded to the substrate at high temperature and high pressure, i.e. where diamond or cubic boron nitride is thermodynamically stable. The hard layer comprises polycrystalline diamond and/or polycrystalline cubic boron nitride, and a catalyst cobalt phase including adjuvant alloying materials for providing oxidation and corrosion resistance. Typical alloying elements include nickel, aluminum, silicon, titanium, molybdenum and chromium. The hard layer has an as-sintered surface and is only about 0.3 mm thick. An additional secondary phase including a carbide, nitride, carbonitride or oxycarbonitride of metals such as titanium may also be present in the PCD or PCBN layer.
摘要:
A mandrel (72) that provides a counter-force to the pressure exerted on the outside of a pipe (90) or other arcuate surface by a friction stir welding tool, wherein the mandrel (72) is expandable through the use of a wedge (82), and wherein the mandrel (72) enables multiple friction stir welding heads to simultaneously perform welding on the arcuate surface.
摘要:
Solid state processing is performed on a workpiece (16) by using a tool (10) capable of friction stir processing, friction stir mixing, or friction stir welding, wherein solid state processing modifies characteristics of a workpiece while substantially maintaining a solid phase in some embodiments, allowing some elements to pass through a liquid phase in other embodiments, and wherein modified characteristics of the material include, but are not limited to, microstructure, macrostructure, toughness, hardness, grain boundaries, grain size, the distribution of phases, ductility, superplasticity, change in nucleation site densities, compressibility, expandability, coefficient of friction, abrasion resistance, corrosion resistance, fatigue resistance, magnetic properties, strength, radiation absorption, and thermal conductivity.
摘要:
A center cutting or plunging end mill (10) or ball mill has one or more spiral grooves (18) and flutes (14) in the walls of a mill body (12) of cemented tungsten carbide. Each groove (18) includes polycrystalline diamond (30) or cubic boron nitride formed in situ along a leading edge (15) of each flute. Such a groove (18) extends across the cutting end of the mill so that the mill can be used for center cutting or plunging. The vein of diamond-like material may extend to the center of the mill body or may extend almost all of the way to the center, leaving an area of tungsten carbide exposed at the center of the mill body. A high temperature-high pressure press is used for forming the polycrystalline diamond-like veins in situ within the grooves in the mill.
摘要:
A mandrel (72) that provides a counter-force to the pressure exerted on the outside of a pipe (90) or other arcuate surface by a friction stir welding tool, wherein the mandrel (72) is expandable through the use of a wedge (82), and wherein the mandrel (72) enables multiple friction stir welding heads to simultaneously perform welding on the arcuate surface.
摘要:
A system and method of using friction stir welding and friction stir processing to perform crack repair or preventative maintenance of various materials and structures, wherein the structures include pipeline, ships, and nuclear reactor containment vessels, wherein the friction stir welding and processing can be performed on various materials including metal matrix composites, ferrous alloys, non-ferrous alloys, and superalloys, and wherein the friction stir welding and processing can be performed remotely and in harsh environments such as underwater or in the presence of radiation.