Abstract: A cast article includes a porous layer having a three-dimensional porous structure, and is manufactured utilizing a mold manufactured by: scattering and adhering combustible powdery particles around a wax mold, which is a lost pattern, to form a layer of combustible powdery particles around the wax mold; coating a film of a ceramic precursor slurry around the wax mold; subjecting the wax mold coated with the slurry film to a heat treatment at 100 to 180° C., to dewax only the wax mold without the combustible powdery particles; and burning and vanishing and firing the slurry film, to burn and vanish the powdery particles in the slurry film and form a shell. Casting the cast article by: pouring a molten metal into the cavity of the mold; cooling the molten metal; and removing the shell of the mold.

Abstract: A mold having a shell and a porous layer formed on the surface of the cavity of the shell. The mold can be suitably used for manufacturing a porous body having a porous layer on the surface thereof. The method for manufacturing the mold, includes the steps of forming a layer of combustible powdery particles around a wax mold, which is a lost pattern, a step of forming a film of a ceramic precursor slurry around the wax mold having powdery particles formed thereon, a step of subjecting the resultant product to a heat treatment, to thereby dewax the wax mold, and a step of firing the slurry film, to thereby burn and vanish the powdery particles in the slurry film and form a shell.

Abstract: The rolling mill comprises a pair of work rolls for rolling a plate material in the thickness direction, a guide for guiding the leading end of the plate material between the work rolls, and a rolling oil supply member for supplying rolling oil between the work rolls through a rolling oil passage formed within the guide. The rolling mill further comprises a temperature adjusted oil passage formed within the guide separately from the rolling oil passage, and a temperature adjusted oil supply member for applying temperature adjusted oil having a different temperature from the rolling oil to the work rolls through the temperature adjusted oil passage so as to control the crown rate of the work rolls, improving the controllability of the crown rate of the work roll.

Abstract: A turbine nozzle segment, a turbine nozzle, a turbine, and a gas turbine engine. The turbine nozzle segment is provided with an outer band 39 of an arc shape, an inner band 41 of an arc shape, a thick stator vane 43 in which an insertion hole 49 to which a probe 47 is insertable from a side of the outer band 39 is formed and on the pressure surface 43b of which an inlet hole 51 communicating with the insertion hole 49 is formed, and a thin stator vane 45 having a suction surface 45a having an identical shape to a suction surface 43a of the thick stator vane 43 and a smooth pressure surface 45b approximating to a pressure surface 43b of the thick stator vane 43 configured to be thinner than the thick stator vane.

Abstract: The invention provides a dovetail structure of a fan which attaches the fan 20 having an inlet hub diameter smaller than an outlet hub diameter to a portion around a discoid disc 10 rotationally driven by a turbine. The disc 10 has a plurality of main dovetail grooves 12 extending in parallel to an axis 1 of a rotation axis from a leading edge to a trailing edge thereof. The fan 20 has a main dovetail portion 22 fitted to the main dovetail groove 12, and a sub engagement portion 24 for supporting a front centrifugal force. Further, the dovetail structure is provided with a spin cone 30 engaging with the sub engagement portion 24 so as to be capable of transmitting the front centrifugal force to the disc 10.

Abstract: A heat exchanger for exchanging heat with gas made to flow in a flow direction is disclosed. The heat exchanger is provided with: a plurality of plates each having a first side and a second side; a plurality of tubes configured to conduct a thermal medium, the tubes penetrating the plates and being arranged in parallel with each other and on a plurality of planes perpendicular to the flow direction, wherein the tubes on each plane are disposed adjacent to gaps between the tubes on any of adjacent planes so as to form a plurality of serpentine flow lines among the tubes; and a plurality of bridges projecting on the first sides of the plates, the bridges being respectively arranged to be perpendicular to the serpentine flow lines.

Abstract: The invention provides a dovetail structure of a fan which attaches a fan 20 having an inlet hub diameter smaller than an outlet hub diameter to a portion around a discoid disc rotationally driven by a turbine. The disc 10 has a plurality of dovetail grooves 12 extending at a fixed angle ?1 with respect to an axis 1 of a rotation axis from a leading edge 10a to a trailing edge 10b thereof, and spaced at a fixed angle in a peripheral direction. The fan 20 has a dovetail portion 22 extending at the same angle as an angle of the dovetail groove and capable of being fitted to the dovetail groove, in an inner end thereof.

Abstract: A change-over apparatus for cooling a gas passage is provided with a cooling chamber and a gas cooling and circulating system. The apparatus is further provided with a stationary partition plate and a slidable shield plate. The stationary partition plate has a suction opening and a discharge opening which are independently communicated respectively with a suction port and a discharge port, and the slidable shield plate has a shield part for partially shielding the suction opening and the discharge opening, whereby it is possible to alternately change over the direction of the gas passing through the cooling chamber.

Abstract: A turbocharger with a variable nozzle has a turbine impeller, a compressor impeller, a shaft coupling the turbine impeller and the compressor impeller, a bearing housing rotatably supporting the shaft, and a turbine housing accommodating the turbine impeller. The turbocharger further includes a variable nozzle mechanism, provided in a compressor impeller side in a radial-direction outer side of the turbine impeller, for adjusting a flow rate of an exhaust gas directed to the turbine impeller. The bearing housing has a radially expanded portion that extends to a radial-direction outer side to be coupled to the turbine housing at a radial-direction outer side portion thereof such that the variable nozzle mechanism is accommodated between the turbine housing and the radially expanded portion. Between the variable nozzle mechanism and the radially expanded portion, a heat shield plate is provided for preventing a heat transmission between them.

Abstract: A motor-driven supercharger of the invention is provided with a cooling fluid flow rate adjusting device (a flow rate adjuster (37) and a controller (40)) capable of adjusting a flow rate of a cooling fluid. On the basis of the flow rate adjuster (37) and the controller (40), a flow rate of a cooling fluid (41) is set to a first flow rate (a large flow rate) for cooling an electric motor (20) in a state where a temperature difference obtained by subtracting a temperature of the cooling fluid (41) from a temperature of the electric motor (20) is equal to or more than a predetermined temperature equal to or more than zero, and the flow rate of the cooling fluid (41) is set to a second flow rate (a small flow rate) which is smaller than the first flow rate and is for suppressing a heating effect to the electric motor (20) in a state where the temperature difference is lower than a predetermined temperature equal to or more than zero.

Abstract: An oil seal structure of a supercharger (10) has an oil shield member (21), a seal housing (25), and an annular seal member (23) arranged between the oil shield member (21) and the seal housing (25). The oil shield member (21) has a portion in which an approximately circular outer edge is formed in a vertical cross section to an axial direction, in a leading end portion in a compressor side, and the oil shield member (21) has an outer edge reduced-diameter portion (21a) which is formed in the leading end in the compressor side and in which a radius of the outer edge is smaller than the other portions of the outer edge. The seal member (23) is fitted to the outer edge reduced-diameter portion (21a). An opening through which the oil shield member (21) passes is formed in the seal housing (25), and the seal housing (25) is brought into contact with the seal member (23) in an inner edge in a radial direction forming the opening.

Abstract: A double-chamber type heat-treating furnace comprises a hermetically closable cooling furnace, a hermetically closable heating furnace, and a transfer unit. The transfer unit has free rollers disposed within the heating and cooling chambers and for supporting the object at only both ends in a direction of width thereof, a push-pull member moving while being engaged with the object to push or pull the object, and a drive unit provided at a position adjacent to the heating chamber on a side opposite to a side on which the cooling chamber is disposed and driving the push-pull device.

Abstract: A twin roll casting machine that can reduce an amount of inert gas to be fed for prevention of oxidization. The machine includes an enclosure enclosing a strip in a range from chilled rolls to pinch rolls, a first swing wall within the enclosure and having a tip end movable toward and away from a surface of the strip, a sealing roll rotatably supported by the tip end of the first swing wall, a second swing wall within the enclosure and having a tip end movable toward and away from the other surface of the strip, a sealing roll rotatably supported by the tip end of the second swing wall, sealing members between peripheral edges of the swing walls and an inner surface of the enclosure, and conduits for supplying inert gas into the enclosure. The respective swing walls are swung to bring the sealing rolls close to the strip to thereby suppress flow of the inert gas from a first space to a second space.

Abstract: What disclosed is to form an abrasive coating having abrasiveness at a blade pressure side of a deposition layer using a second electrode composed of a second molded body molded from a mixed powder including a powder of a metal and a powder of a ceramic or the second electrode processed with a heat treatment, generating pulsing electric discharges between the blade pressure side of the deposition layer and the second electrode in an electrically insulating liquid or gas, and welding a material of the second electrode or a reacting substance of the material of the second electrode on the blade pressure side of the deposition layer by means of energy of the electric discharges.

Abstract: A first compression stage and a second compression stage being arranged at positions adjacent to each other. The first centrifugal impeller and the second centrifugal impeller are arranged in such an orientation that back sides of the first centrifugal impeller and the second centrifugal impeller face to each other. A connection flow path is formed in the first housing and the second housing for introducing the compressed fluid from the first compression stage into the second compression stage. An upstream portion of the connection flow path is formed integrally with the first housing, and a downstream portion of the connection flow path is formed integrally with the second housing.

Abstract: A first centrifugal impeller and a second centrifugal impeller are arranged in such an orientation that back sides of the first centrifugal impeller and the second centrifugal impeller face to each other. Bearings are cylindrical roller bearings and a thrust bearing. The cylindrical roller bearings are arranged at two axially spaced supporting positions respectively, and support a radial load applied to the rotating shaft. The thrust bearing supports a thrust load applied to the rotating shaft.

Abstract: A gas cooling type vacuum heat-treating furnace according to the present invention, includes a gas cooling furnace comprising a cooling chamber in which an article to be heat-treated is stationarily set, and defining therein a gas passage in a vertical direction, a gas cooling and circulating device for cooling and circulating gas flowing in the cooling chamber, a gas direction switching device for alternately changing over directions of gas vertically passing through the cooling chamber, and upper and lower straighteners blocking upper and lower ends of the cooling chamber, for causing a velocity distribution of the gas to be uniform.

Abstract: There are provided with a motor rotor (22) fixed to a turbine shaft (12) and rotating together with the turbine shaft, a motor stator (24) surrounding the motor rotor and fixed within a bearing housing (16), an inverted (26) converting a dc power into an ac power, and an inverter controller (28) controlling a frequency and a voltage of the ac power by the inverter. The inverter and the inverter controller are accommodated in a driver container (29), and are coupled to a compressor housing (20) by an insulating coupling member (30).

Abstract: Formation of a protective coating having oxidation resistance on a portion to be processed of a component main body by employing an electrode composed of a molded body molded from mixed powders of one or more of an aluminum powder, an aluminum alloy powder, a chromium powder and a chromium alloy powder, or the molded body processed with a heat treatment, generating a pulsing electric discharge between the portion to be processed of the component main body and the electrode in an electrically insulating liquid or gas so that an electrode material of the electrode is adhered to the portion to be processed of the component main body by energy of the electric discharges, and further keeping the portion to be processed of the component main body and the electrode material adhered thereto in high temperatures so that the electrode material adhered thereto diffuses into a base material of the component main body.

Abstract: In the present invention, forming is carried out by employing casting to rapidly solidify molten material comprising a copper base alloy containing 3 to 20% Ag (mass % hereinafter), 0.5 to 1.5% Cr and 0.05 to 0.5% Zr. Next, an aging treatment for precipitation is carried out at 450 to 500° C., and the formed article is obtained by precipitation strengthening. In addition, in the aforementioned copper base alloy, molten material comprising a copper base alloy containing Ag in the amount of 3 to 8.5% is solidified by casting, and the solidified article or the hot worked article thereof is subjected to an aging treatment for precipitation and a thermomechanical treatment using forging or rolling, and the casting is obtained by forming the material into a specific shape and carrying out precipitation strengthening.