摘要:
A blade member for cutting-tools includes a cermet substrate which contains, apart from unavoidable impurities, a binder phase and a hard dispersed phase. The binder phase contains 5% to 30% by weight of cobalt and/or nickel. The hard dispersed phase contains a balance composite carbonitride of titanium and one or more of the elements tungsten, molybdenum, tantalum, niobium, hafnium and zirconium. The composite carbo-nitride satisfies the relationship 0.2.ltoreq.b/(a+b).ltoreq.0.7, where a and b denote atomic ratios of carbon and nitrogen, respectively. The substrate includes a hard surface layer in which the maximum hardness is present at a depth between 5 .mu.m and 50 .mu.m from a substrate surface thereof. The substrate surface has a hardness of 20% to 90% of the maximum hardness.
摘要:
A target according to the present invention contains metallic copper ranging from about 8% to about 40% by volume and an oxide containing a rare earth metal such as yttrium and an alkaline earth metal, and has a metallic structure where the oxide is substantially uniformly dispersed into the metallic copper, so that a large thermal conductivity, great mechanical strength and a low electric resistivity are achieved.
摘要:
A rotary knife assembly includes a rotary shaft, a flange, a rotary knife of an annular shape and a resilient member. The flange includes a radially-outwardly protruding flange portion having opposite end faces and a reduced diameter portion disposed adjacent to the flange portion. The rotary knife has opposite faces and is fitted on the reduced-diameter portion of the flange with one of the opposite faces directed toward one of the opposite end faces of the flange portion. The resilient member is mounted on the flange for urging the rotary knife toward the flange portion. There is also provided a shifting mechanism mounted on the flange for shifting the rotary knife in a direction away from the flange portion against the urging force of the resilient member.
摘要:
There is disclosed an insert clamped tool which has a tool holder including a recess formed at a forward end thereof and defining an insert-receiving seat. The tool holder has a pin-receiving hole formed therein so as to open to the insert-receiving seat and having a tapered portion. A positioning pin is releasably received in the hole of the tool holder. The positioning pin has an engaging portion formed at one end thereof and a tapered portion fitted in the tapered portion of the hole. A cutting insert having a mounting bore formed therethrough is received on the insert-receiving seat in such a manner that the engaging portion of the positioning pin is held in abutting engagement with the mounting bore of the insert. A clamp mechanism is arranged on the tool holder for pressing the insert against the insert-receiving seat and the engaging portion of the positioning pin.
摘要:
In a rotary cutting tool for use with at least one cutting tip, a cutter body has its forward end whose outer periphery has mounted thereto the cutting tip. A chip suction device is arranged outwardly of an outer peripheral surface of the cutter body for drawing chips generated by the cutting tip. The chip suction device includes a generally cylindrical cover unit having a wall for covering the cutter body. The cover unit is supported by the cutter body for rotation relative thereto. A chip accommodating chamber is defined between an inner peripheral surface of the cover unit and the outer peripheral surface of the cutter body. A suction port unit is provided in the wall of the cover unit and communicates with the chip accommodating chamber. A chip guide unit is arranged at the forward end of the cutter body in facing relation to the face of the cutting tip for guiding the chips generated by the cutting tip to the chip accommodating chamber.
摘要:
In the process for preparing thick films comprising dispersing powder of a starting material for thick films in a solvent system, applying direct electric potential between the electrodes provided in the solvent system and thus electrodepositing the powder material on a substrate connected to the cathode, an improvement wherein a mixed solvent comprising an alcohol or alcohols, a methyl-group-containing ketone or ketones and nitorcellulose is disclosed. By this process thick films of solid electrolytes can be economically formed.
摘要:
A novel synchronizer ring for use in a speed variator that is made of a Cu base alloy and which exhibits good initial accommodation by mating surfaces while ensuring high wear resistance is disclosed. The ring is made of a Cu base alloy containing 20-40% Zn (all percents being on a weight basis), 2-8% Al, and at least two components (intermetallic compound forming components) selected from among the following five elements, i.e., 0.1-3% of at least one of Ti, Zr and Cr, 0.1-3% Sn, 0.1-6% of at least one of Fe, Ni and Co, 0.1-5% Mn and 0.2-2% Si, and optionally at least one additional component that differs from said selected two components and which is selected from among 0-5% Mn, 0-3% Sn and 0-3% of at least one of Ti, Zr and Cr, and the balance being Cu and incidental impurities. The ring also has either an oxide film layer of aluminum oxide base with an average thickness of 0.1-10 .mu.m or a work-hardened layer with an average thickness of 5-300 .mu.m formed on the surface of the ring where it is to contact a mating member.
摘要:
There is disclosed a process for fabricating UO.sub.2 pellets from highly active uranium dioxide powders, comprising the steps of (1) uniformly adding at least one pore-former agent in the range of 0.3 to 1.4% by weight to uranium dioxide powders as a starting material, the pore-former agent decomposing and sublimating below 600.degree. C. and having an average particle size in the range of 5 to 500 .mu.m, (2) compacting the uranium dioxide powders including the pore-former agent to form green pellets, and (3) sintering the green pellets to form sintered UO.sub.2 pellets having large grain size crystals. According to the present invention, UO.sub.2 pellets having the sintered density in the range of 94 to 97% TD are fabricated from highly active UO.sub.2 powder when the pellets have large crystalline grain sizes exceeding 20 .mu.m. Accordingly, the fission gasses generated during irradiation is restrained to the inside pellet thereof to enhance the safety of the irradiation.
摘要:
A modified olefinic polymer is obtained by fluorinating an ethylene/.alpha.-olefin copolymer having the following properties (i) to (iv), said ethylene/.alpha.-olefin copolymer being prepared by copolymerizing ethylene and an .alpha.-olefin having 3 to 12 carbon atoms in the presence of a catalyst comprising a solid catalyst component and an organoaluminum compound, said solid catalyst component containing at least magnesium and titanium:(i) Melt index: 0.01-100 g/10 min(ii) Density: 0.860-0.910 g.cm.sup.3(iii) Maximum peak temperature (Tm) as measured according to a differential scanning calorimetry (DSC) should be not lower than 100.degree. C.(iv) Insolubles in boiling n-hexane should be not less than 10% by weight.
摘要:
A polyethylene resin composition comprising (A) 50-99.9 parts by weight of an ethylene polymer and (B) 0.1-50 parts by weight of a modified ethylene polymer obtained by fluorinating an ethylene polymer having a density in the range of larger than 0.910 g/cm.sup.3 and 0.970 g/cm.sup.3 ; said ethylene polymer being prepared by polymerizing ethylene in the presence of a catalyst comprising a catalyst component containing at least one member selected from the group consisting of a titanium compound, vanadium compound and chromium compound, and optionally an organoaluminum compound.