摘要:
A three-dimensional object of a desired shape is made by irradiating an optical beam on a metal powder layer to form a sintered layer and by laminating such sintered layer one above another. A metal powder composition for use in making such a three-dimensional object includes an iron-based powder material, a nickel and/or nickel alloy powder material, a copper and/or copper alloy powder material, and a graphite powder material. The graphite powder material acts to enhance the wettability during melting and to reduce microcracks during solidification.
摘要:
An apparatus for making a three-dimensional object includes a powdery layer-forming unit for forming a powdery layer on a table and an optical beam-irradiating unit for irradiating an optical beam on a predetermined region of the powdery layer to sinter the predetermined region. The optical beam-irradiating unit is disposed at a position spaced from immediately above an optical beam-irradiating range to obliquely irradiate the optical beam on the powdery layer. Because fumes generated by irradiating and heating the powdery layer with the optical beam rise towards a position immediately above them, the optical beam is irradiated from the position spaced from immediately above the optical beam-irradiating range, thereby reducing a cloud of the optical beam-irradiating unit that may be caused by the fumes.
摘要:
A pile fabric comprises a base fabric and a pile layer composed of many cut piles extending from at least one face of the base fabric, and has a pile length of from 2 to 30 mm. The pile yarns forming the cut piles are core-sheath type composite yarns each comprising a core portion composed of thick fibers (preferably filaments) having a single fiber size of from 5 to 55 dtex and a sheath portion that is composed of thin fibers (preferably filaments) having a single fiber size of from 0.01 to 2.5 dtex, and that surrounds and covers the core portion. The pile fabric is excellent in the dust removal effect during wiping, and resistance to laying flat, and is useful as a fabric for cleaning.
摘要:
To make a three-dimensional object, an optical beam is first irradiated on a predetermined portion of a powder layer to form a sintered layer, which is then covered with a new powder layer. The optical beam is again irradiated on a predetermined portion of the new powder layer to form another sintered layer that has been united with the underlying sintered layer. These processes are repeatedly carried out to form a plurality of sintered layers united together, which have a size greater than that of a target shape of the three-dimensional object. A surface region of a shaped object formed by then is removed during the formation of the plurality of sintered layers.
摘要:
An automotive air conditioning apparatus 10 is provided which includes a forced water supply system 9 and a heat pump system 14. A controller 16 controls the temperature of a second heat exchanger 38 of the heat pump system 14 to a desired temperature based on a preset temperature. The controller 16 also controls the temperature of the water circulating through the heat exchanger 20 of the forced water supply system 9 to a temperature at which the quantity of heat exchange between the air heated by the second heat exchanger 38 to the desired temperature and the heat exchanger 20 of the forced water supply system is minimized. According to this air conditioning arrangement, the temperature of the vehicle interior can be promptly raised without any capability drop being caused and thus, the heating efficiency of the apparatus being well enhanced.
摘要:
A stripline-type delay line has a plurality of rectangular sheet layers which are made from a dielectric material with a relative dielectric constant .di-elect cons.r of about 6.3, having magnesium oxide and silica as main components. One sheet layer is placed at the top, and the other layers are laminated thereunder in the following order: a sheet layer on which a first ground conductor is formed on its upper surface, a sheet layer on which a transmission line folded in a meander shape is formed on its upper surface, and a sheet layer on which a second ground conductor is formed on its upper surface. On side faces of the laminated dielectric and on adjacent portions of the upper and lower surfaces, an input terminal, an output terminal, and ground terminals are formed by printing, and then the dielectric is baked. The length A of the opposing line sections of said transmission line is preferably set such that the first peak frequency f of the delay time is within or above the frequency range of use, and substantially satisfies the following expression: ##EQU1## wherein Co indicates the speed of light, and .di-elect cons.r indicates the relative dielectric constant of said dielectric layers.
摘要:
A delay line is produced by firing a laminated body and terminals (an input terminal, an output terminal and grounding terminals) which are formed by printing or another method on the side faces, top and bottom surfaces of the laminated body. The laminated body has four dielectric rectangular sheet layers (dielectric constant .epsilon.r=approximately 6.3) containing mainly barium oxide, aluminum oxide and silica. The laminated body is formed by layering from top to bottom, in the order given, a first sheet layer, a second sheet layer which has a grounding conductor formed on its top surface, a third sheet layer which has a transmission line meanderingly formed on its top surface, and a fourth sheet layer which has another grounding conductor formed on its top surface. The transmission line has a meandering shape which defines a meander width, and has delay time peaks at respective frequencies, wherein the frequency fn at the n-th delay time peak substantially satisfies the formula: ##EQU1## where Co represents the speed of light; .epsilon.r, the dielectric constant of the dielectric layer; A, the meander width of the meanderingly formed transmission line; and n, a natural number. The transmission line may be formed by connecting in series a plurality of meanderingly formed transmission line segments having different respective meander widths. The plurality of transmission line segments may be formed opposite each other with the dielectric layer provided therebetween, the plurality of transmission line segments being connected to each other at ends thereof.
摘要:
A combustion apparatus has a fuel feed unit, a blower for supplying combustion air, a mixing unit of fuel and combustion air, a first catalyst provided downstream of the mixing unit, a first heat receiving unit adjacent to the first catalyst, a second catalyst with a large geometrical surface area than that of the first catalyst provided downstream in the flow direction of the first catalyst, an electric heater for heating the catalyst provided downstream of the second catalyst, an air permeable insulator provided downstream of the electric heater, and a second heat receiving unit provided downstream of the air permeable insulator, wherein power is supplied to the electric heater when starting combustion to heat the second catalyst over the reaction temperature of catalyst, a mixed gas of fuel and air is fed to start catalytic combustion of second catalyst, the downstream portion in flow direction of the first catalyst is heated over the reaction temperature of catalyst by the combustion heat of the second catalyst, and combustion is started by the first catalyst.
摘要:
A wheel assembling apparatus for assembling different types of wheels to different types of vehicle bodies conveyed along a vehicle assembling line has a robot hand for fastening a plurality of nuts to hub bolts provisionally affixed to the wheel so as to assemble the wheel held by the robot hand to the vehicle body. The robot hand is provided with a center pin attachment to which different types of center pins, having been prepared correspondingly to center holes of the different types of wheels, are selectively and detachably attached. The center pin attached to the robot hand is fitted into the center hole of the wheel hub and locates the wheel in position with respect to the robot hand.
摘要:
The mirror drive for remote-controlled rear-view mirror assembly includes an air-tight container housing two motors to drive the horizontal and vertical turns of the mirror and which is composed of two synthetic resin-made casings which are closely attached to each other. Plural conductive plates which electrically connect terminals of the two motors to external terminals outside the airtight containers are previously buried in an insulative block with both ends there being exposed outside of the block. The insulative block covers the opening formed in the lateral wall of either of the casings and is secured to the lateral wall of the casing. Of the exposed ends of the plural conductive plates, those ones which are connected to the terminals of the motor are located inside the casings, while the other ends which are connected to the external connectors are led out through the opening in the casing.