A Ti—Fe-based sintered alloy material including two phases of an α phase and a β phase, in which a content of iron is 0.5% or more and 7% or less on a weight basis, a β phase containing an iron component is dispersed in an independent state in an α phase, an area ratio of the β phase containing an iron component is 60% or less of an entire area, and an equiaxed crystal grain is contained in the α phase.

A Ti—Fe-based sintered alloy material including two phases of an α phase and a β phase, in which a content of iron is 0.5% or more and 7% or less on a weight basis, a β phase containing an iron component is dispersed in an independent state in an α phase, an area ratio of the β phase containing an iron component is 60% or less of an entire area, and an equiaxed crystal grain is contained in the α phase.

A method without a calibration step produces a camshaft adjuster including a stator, a rotor rotatable relative thereto and a control valve, wherein the rotor and/or the stator is or are produced according to a powder-metallurgical process, wherein the stator in the region of a fitting surface for contacting the camshaft and/or the rotor in the region of a fitting surface for contacting the camshaft and/or in the region of a fitting surface for contacting the control valve and/or the control valve in the region of a sealing surface is or are produced having a tolerance so that a clearance fit with a maximum clearance of 100 μm is formed between the fitting surface for the camshaft and the camshaft and/or between the fitting surface for contacting the sealing surface of the control valve and the sealing surface of the control valve.

A method without a calibration step produces a camshaft adjuster including a stator, a rotor rotatable relative thereto and a control valve, wherein the rotor and/or the stator is or are produced according to a powder-metallurgical process, wherein the stator in the region of a fitting surface for contacting the camshaft and/or the rotor in the region of a fitting surface for contacting the camshaft and/or in the region of a fitting surface for contacting the control valve and/or the control valve in the region of a sealing surface is or are produced having a tolerance so that a clearance fit with a maximum clearance of 100 μm is formed between the fitting surface for the camshaft and the camshaft and/or between the fitting surface for contacting the sealing surface of the control valve and the sealing surface of the control valve.

According to a several embodiment, provided is a method for manufacturing a molded object, including a material preparing step to prepare a material powder obtained by removing carbon from medium carbon steel or high carbon steel until a carbon content is 0.1 mass % or less, a molding step to form a desired molded object by a lamination molding method repeating the steps of: a recoating step to uniformly spread the material powder on a molding table to form a material powder layer; and a sintering step to irradiate a predetermined portion of the material powder layer with a laser beam to form a sintered layer; and a carburization step to subject the molded object to carburization after the molding step is performed.

According to a several embodiment, provided is a method for manufacturing a molded object, including a material preparing step to prepare a material powder obtained by removing carbon from medium carbon steel or high carbon steel until a carbon content is 0.1 mass % or less, a molding step to form a desired molded object by a lamination molding method repeating the steps of: a recoating step to uniformly spread the material powder on a molding table to form a material powder layer; and a sintering step to irradiate a predetermined portion of the material powder layer with a laser beam to form a sintered layer; and a carburization step to subject the molded object to carburization after the molding step is performed.

An outer ring for a variable oil pump including 0.5 to 0.7% by weight of carbon (C), 2.9 to 3.8% by weight of nickel (Ni), 1.3 to 1.7% by weight of copper (Cu), 0.4 to 0.6% by weight molybdenum (Mo), and a remainder of iron (Fe) and unavoidable impurities, in which austenite occupies less than 15% of a total area, and a method of manufacturing the same are provided, and a method of manufacturing the same are provided.

An outer ring for a variable oil pump including 0.5 to 0.7% by weight of carbon (C), 2.9 to 3.8% by weight of nickel (Ni), 1.3 to 1.7% by weight of copper (Cu), 0.4 to 0.6% by weight molybdenum (Mo), and a remainder of iron (Fe) and unavoidable impurities, in which austenite occupies less than 15% of a total area, and a method of manufacturing the same are provided, and a method of manufacturing the same are provided.

A lamination molding apparatus is provided capable of preventing damage to a cutting device. Every time a sintered body including a sintered layer group consisting of a predetermined number of sintered layers is formed, gas is injected from a gas injector toward a vicinity of a side surface of the newly formed sintered body so as to blow off material powder, and then the side surface of the sintered body is shaved by a cutting tool of the cutting device, wherein the gas injector blows off the material powder by only intermittent injection which repeats short-time gas injection or by a combination of the intermittent injection and continuous injection which continuously injects the gas.

A lamination molding apparatus is provided capable of preventing damage to a cutting device. Every time a sintered body including a sintered layer group consisting of a predetermined number of sintered layers is formed, gas is injected from a gas injector toward a vicinity of a side surface of the newly formed sintered body so as to blow off material powder, and then the side surface of the sintered body is shaved by a cutting tool of the cutting device, wherein the gas injector blows off the material powder by only intermittent injection which repeats short-time gas injection or by a combination of the intermittent injection and continuous injection which continuously injects the gas.