Abstract: After an annular plate is blanked from a metal flat plate in a blanking step, an inner peripheral portion of the annular plate is deformed upward in a burring step. As a result, a hat-shaped intermediate product having an upstanding tubular portion and an annular plate portion is formed. After that, an outer peripheral portion of the annular plate portion is folded step by step toward an inner peripheral side of the annular plate portion. As a result, a folded portion composed of a first folded portion and a second folded portion is formed, whereby a connection portion having a second flange portion is formed.

Abstract: A flexible flywheel includes: a shaft fastening portion fixed to an end portion of an engine crankshaft; an annular inertia ring provided around the shaft fastening portion; a plurality of elastic spoke portions which extend in the radial direction between the shaft fastening portion and the inertia ring and connect the shaft fastening part and the inertia ring to each other, and that absorb vibration acting on the crankshaft by undergoing deflection; and weight portions provided between adjacent ones of the elastic spoke portions. The fastening portion, inertial ring, elastic spoke portions, and weight portions are formed integrally by casting or forging.

Abstract: An exhaust device for an internal combustion engine includes an exhaust manifold including branch pipe portions respectively connected to cylinders of the internal combustion engine in which exhaust strokes are executed at different timings, and a collecting pipe portion to which the branch pipe portions are collected and connected at a downstream side of the branch pipe portions, a catalyst provided at a downstream side of the collecting pipe portion in the exhaust manifold, an exhaust pipe provided at a downstream side of the catalyst, a sensor detecting a state of exhaust gas and provided in the exhaust pipe, and a connecting wall portion connecting the catalyst and the exhaust pipe and extending in a different direction with respect to a first central axis of the catalyst along a flow direction of the exhaust gas.

Abstract: This ferritic spheroidal graphite cast iron contains 3.0% to 3.6% by mass of C, 4.0% to 5.0% by mass of Si, 0.020% to 0.10% by mass of Mg, 1.0% or less of Mn, 0.10% by mass or less of P, and 0.015% by mass or less of S, with the balance being Fe and inevitable impurities.

Abstract: A metal material supply device which is annexed to a metal melting furnace has a vibration trough for transporting metal material to be supplied to a crucible; the transported metal material is discharged from a material discharge port that is provided at the front end of the vibration trough; the metal material supply device is movable between a material supply position where the material discharge port is disposed above the crucible and a retracted position from the material supply position, and supplies the metal material to the crucible at the material supply position; the upper end of the metal material supplied to the crucible and piled up is detected by a microwave level meter, and the material supply operation by driving the vibration trough is controlled on the basis of the detected value.

Abstract: A flexible flywheel includes: a shaft fastening portion fixed to an end portion of an engine crankshaft; an annular inertia ring provided around the shaft fastening portion; a plurality of elastic spoke portions that extend in the radial direction between the shaft fastening portion and the inertia ring and connect the shaft fastening portion and the inertia ring to each other, and that absorb vibration acting on the crankshaft by undergoing deflection; and weight portions provided between adjacent elastic spoke portions, side edge-side boundary ends, to which boundaries with the weight portions are connected, are provided on both sides edges of the elastic spoke portion, respectively, when the elastic spoke portions are vibrated, stress concentrates on the side edge-side boundary ends.

Abstract: A spheroidal graphite cast iron having an excellent impact strength at low temperature and a method for producing the same are provided. The present disclosure relates to the spheroidal graphite cast iron comprising: C: 3.5 mass % to 4.2 mass %; Si: 2.0 mass % to 2.8 mass %; Mn: 0.2 mass % to 0.4 mass %; Cu: 0.1 mass % to 0.7 mass %; Mg: 0.02 mass % to 0.06 mass %; Cr: 0.01 mass % to 0.15 mass %; and the balance: Fe and inevitable impurities, wherein Mn+Cr+Cu is 0.431 mass % to 1.090 mass %, a graphite nodule count is 230/mm2 or less, and a pearlite fraction is 30% to 85%.

Abstract: A flexible flywheel includes: a shaft fastening portion fixed to an end portion of an engine crankshaft; an annular inertia ring provided around the shaft fastening portion; a plurality of elastic spoke portions which extend in the radial direction between the shaft fastening portion and the inertia ring and connect the shaft fastening part and the inertia ring to each other, and that absorb vibration acting on the crankshaft by undergoing deflection; and weight portions provided between adjacent ones of the elastic spoke portions. The fastening portion, inertial ring, elastic spoke portions, and weight portions are formed integrally by casting or forging.

Abstract: After an annular plate is blanked from a metal flat plate in a blanking step, an inner peripheral portion of the annular plate is deformed upward in a burring step. As a result, a hat-shaped intermediate product having an upstanding tubular portion and an annular plate portion is formed. After that, an outer peripheral portion of the annular plate portion is folded step by step toward an inner peripheral side of the annular plate portion. As a result, a folded portion composed of a first folded portion and a second folded portion is formed, whereby a connection portion having a second flange portion is formed.

Abstract: This disc rotor has a hat portion having a cylindrical portion and a sliding plate portion having an insertion hole into which the cylindrical portion is inserted, being connected together with the hat portion in a state in which the cylindrical portion protrudes from the insertion hole. The coupling is achieved by pinching an inner peripheral edge of the sliding plate portion between a first portion and a second portion that are formed in the cylindrical portion. The second portion is formed by plastically deforming an outer peripheral side of the cylindrical portion toward the first portion.

Abstract: There is provided a manufacturing method of a terminal plate including a conductive plate and a terminal that is welded to the conductive plate and that is made of a different material from a material of the conductive plate. This manufacturing method comprises an overlapping process of laying an end portion of the terminal on the conductive plate; a pressing process of pressing part of overlapping surfaces of the conductive plate and the terminal, after the overlapping process; and a welding process of welding at least part of a remaining region excluding the pressed part of the overlapping surfaces, by friction stir welding.

Abstract: An exhaust gas receiver 21 is provided between an expanded passage portion 132 of an upstream connection member 13 and a catalyst end surface 111. The exhaust gas receiver 21 extends along the entire circumference of a catalyst accommodation case 12. The exhaust gas receiver 21 extends from an upstream opening end portion 121 of the catalyst accommodation case 12 toward an inner part of the passage of the expanded passage portion 132 such that the exhaust gas receiver 21 separates from the expanded passage portion 132, and a space 211 is defined between the exhaust gas receiver 21 and the catalyst end surface 111. Flows of bypass exhaust gas hitting against the catalyst end surface 111 and bouncing off the catalyst end surface 111 hit against and are received by the exhaust gas receiver 21.

Abstract: An outer housing 12 formed of a sheet metal is provided such that its open end portion 312 surrounds an outer edge portion 26 of an inner housing 11 formed by casting. An outer protrusion 216, an annular protrusion 227, and a connecting portion 27 are provided on the outer edge portion 26 of the inner housing 11. The open end portion 312 of the outer housing 12 is joined to a protruding end 217 of the outer protrusion 216, a protruding end 228 of the annular protrusion 227, and an end edge 271 of the connecting portion 27, whereby the inner housing 11 and the outer housing 12 are integrated.

Abstract: An austenitic heat-resistant cast steel includes 0.1% to 0.6% by mass of C, 1.0% to 3.0% by mass of Si, 0.5% to 1.5% by mass of Mn, 0.05% by mass or less of P, 0.05% to 0.3% by mass of S, 9% to 16% by mass of Ni, 14% to 20% by mass of Cr, 0.1% to 0.2% by mass of N, and the balance of iron and inevitable impurities, in which a matrix structure of the austenitic heat-resistant cast steel is composed of austenite crystal grains, and a ferrite phase is dispersed and interposed between the austenite crystal grains so as to cover the austenite crystal grains.

Abstract: A hybrid metal melting furnace uses a furnace lid to hold molten metal, while inhibiting reduction in the service life of burners of the furnace lid caused by long periods of exposure to high heat. This hybrid metal melting furnace includes a crucible for accommodating metal to be melted; and an induction coil causing induced current to flow through and heat the metal. A furnace lid which closes an opening in the crucible includes: a first furnace lid having burners for injecting flames into the crucible; and a second furnace lid which does not have the burners. When melting the metal, the first furnace lid is disposed in a position in which the opening is closed. When holding the molten metal in the crucible, the first furnace lid is removed from the opening, and the second furnace lid is disposed in the position in which the opening is closed.

Abstract: A vehicle forced-induction device includes a first exhaust turbine type forced-induction unit and a second exhaust turbine type forced-induction unit. The first forced-induction unit includes an outlet pipe. The outlet pipe includes a first tubular portion and an annular first flange. The second forced-induction unit includes an inlet pipe. The inlet pipe includes a second tubular portion and an annular second flange. The forced-induction device includes a fastener that includes an annular groove. The annular groove has a shape in which a width of the annular groove decreases toward a groove bottom. The fastener is wound around the first and second flanges along a circumference of the first and the second flanges, thereby housing the first and second flanges in the annular groove. The fastener fastens the first and second flanges to urge the first and second flanges toward each other.

Abstract: An infrared heating method comprises: wholly infrared heating a steel sheet uniformly up to a temperature which is A3 point or above; and temperature distribution controlling, wherein, after the wholly infrared heating, partial lowering of a light intensity of infrared rays irradiated toward the steel sheet is performed to provide a first region having a temperature of A3 point or above and a second region having a temperature less than A1 point in the steel sheet.

Abstract: This disc rotor has a hat portion having a cylindrical portion and a sliding plate portion having an insertion hole into which the cylindrical portion is inserted, being connected together with the hat portion in a state in which the cylindrical portion protrudes from the insertion hole. The coupling is achieved by pinching an inner peripheral edge of the sliding plate portion between a first portion and a second portion that are formed in the cylindrical portion. The second portion is formed by plastically deforming an outer peripheral side of the cylindrical portion toward the first portion.

Abstract: The purpose of the present invention is to provide a melting material supply apparatus which is capable of contributing to improvements in the working environment and the melting efficiency of a metal melting furnace, and which is also capable of making melting work more efficient. This melting material supply apparatus for supplying a melting material to a crucible is provided with: a melting material supply unit for supplying the melting material to the crucible; and a furnace lid for closing an opening provided in the upper part of the crucible. The furnace lid is supported in a horizontal state by a furnace lid-supporter, and is capable of being moved between a position in which the opening is closed, and a standby position located above a hood. When the furnace lid is in the standby position, the opening is open, and the melting material can be supplied into the crucible therefrom.

Abstract: Provided are a metal/CFRP composite structure which has lightweight and high strength by combining hot-pressed metal material(s) and carbon fiber reinforced plastic (CFRP) material(s), and its manufacturing method and apparatus. A metal blank material is heated to a temperature at which quenching is possible to obtain a first intermediate product quenched by hot-pressing. The first intermediate product, and a carbon fiber reinforced plastic (CFRP) prepreg comprising carbon fiber and uncured thermoset plastic are set into CFRP forming dies followed by press-forming the prepreg to obtain a secondary intermediate product having the CFRP in intimate contact with a surface of the first intermediate product. The CFRP and the first intermediate product are firmly adhered together by thermal curing of thermoset plastic located in the boundary of the CFRP and the first intermediate product, by subjecting the thermoset plastic contained in the CFRP prepreg to thermal curing.