Abstract: An acid solution preparation device is an acid solution preparation device for preparing an acid solution used for pickling of a steel plate, the device including a sealed tank for storing the acid solution, a gas supply part for supplying an oxygen-containing gas from outside of the sealed tank to the sealed tank, and a purge part for discharging a gas in the sealed tank to the outside.

Abstract: An impeller manufacturing method includes: integrally forming an impeller by an additive manufacturing method using a metal powder, the impeller including a disk which has a disk shape about an axis, a plurality of blades which are formed on a surface facing a first side in an axial direction of the disk with gaps therebetween in a circumferential direction about the axis, and a cover which covers the plurality of blades from the first side in the axial direction; processing the integrally formed impeller by a hot isostatic pressing; and causing a polishing fluid containing abrasive grains to flow through a flow path formed between the disk, the cover, and the blades in the impeller after the processing with the hot isostatic pressing and while pressurizing the polishing fluid to perform fluid polishing.

Abstract: The purpose of the present invention is to provide a method for producing a pipe material and to provide a mandrel with which resistance between a member to be processed and the mandrel during bending processing can be reduced and overall processing time can be shortened. The method for producing a pipe material includes: a step for inserting a mandrel, which is provided on the inside thereof with a flow path through which dry ice powder flows and spray holes at the tip thereof for spraying the dry ice powder, inside pipe material; a step for spraying the dry ice powder from the spray holes inside the pipe material; and a step for performing bending processing on the pipe material wherein the mandrel has been inserted.

Abstract: A multilayer structure includes: a base material made of an iron-based metal material; a nitride layer that is provided on a surface of the base material through a nitriding treatment performed to the base material; an intermediate layer provided on a surface of the nitride layer; and a DLC layer provided on a surface of the intermediate layer. The intermediate layer is made of Si3N4, and the DLC layer has a thickness of 2 ?m to 10 ?m.

Abstract: An impeller manufacturing method includes: integrally forming an impeller by an additive manufacturing method using a metal powder, the impeller including a disk which has a disk shape about an axis, a plurality of blades which are formed on a surface facing a first side in an axial direction of the disk with gaps therebetween in a circumferential direction about the axis, and a cover which covers the plurality of blades from the first side in the axial direction; processing the integrally formed impeller by a hot isostatic pressing; and causing a polishing fluid containing abrasive grains to flow through a flow path formed between the disk, the cover, and the blades in the impeller after the processing with the hot isostatic pressing and while pressurizing the polishing fluid to perform fluid polishing.

Abstract: A multilayer structure includes: a base material made of an iron-based metal material; a nitride layer that is provided on a surface of the base material through a nitriding treatment performed to the base material; an intermediate layer provided on a surface of the nitride layer; and a DLC layer provided on a surface of the intermediate layer. The intermediate layer is made of Si3N4, and the DLC layer has a thickness of 2 ?m to 10 ?m.

Abstract: The purpose of the present invention is to provide a method for producing a pipe material and to provide a mandrel with which resistance between a member to be processed and the mandrel during bending processing can be reduced and overall processing time can be shortened. The method for producing a pipe material includes: a step for inserting a mandrel, which is provided on the inside thereof with a flow path through which dry ice powder flows and spray holes at the tip thereof for spraying the dry ice powder, inside pipe material; a step for spraying the dry ice powder from the spray holes inside the pipe material; and a step for performing bending processing on the pipe material wherein the mandrel has been inserted.

Abstract: Provided is a mandrel which is inserted into a pipe material when the pipe material is bent, the mandrel including: a core member having a rod-shaped main body portion and a small-diameter portion which is provided on one end side of the main body portion and which is thinner than the main body portion; and a front end member which is provided on one end side of the core member and which is formed integrally with the core member so as to cover the small-diameter portion.

Abstract: Provided is a method of manufacturing a rotary machine, which includes: a casing forming process of forming a casing of the rotary machine that has multiple opening parts and suctions and discharges a fluid; a surface activating process of supplying a pretreatment liquid into the casing, then discharging the pretreatment liquid from the casing through the opening parts, and activating an inner surface of the casing after the casing forming process; a plating process of performing supply and discharge of a plating liquid into and from the easing through the opening parts to circulate the plating liquid and plating the inner surface of the casing after the surface activating process; and an assembling process of providing a rotating body that is rotatable relative to the casing so as to he covered from an outer circumference side by the casing plated in the plating process.

Abstract: Provided is a mandrel which is inserted into a pipe material when the pipe material is bent, the mandrel including: a core member having a rod-shaped main body portion and a small-diameter portion which is provided on one end side of the main body portion and which is thinner than the main body portion; and a front end member which is provided on one end side of the core member and which is formed integrally with the core member so as to cover the small-diameter portion.

Abstract: A method for producing a member for fluid machines, which includes: a coating step of applying a glass-based material to the surface of a base; a smoothing step of removing some of the glass-based material while heating and melting the glass-based material after the coating step; and a solidification step of solidifying the heated and melted glass-based material after the smoothing step.

Abstract: Provided is a method of manufacturing a rotary machine, which includes: a casing forming process of forming a casing of the rotary machine that has multiple opening parts and suctions and discharges a fluid; a surface activating process of supplying a pretreatment liquid into the casing, then discharging the pretreatment liquid from the casing through the opening parts, and activating an inner surface of the casing after the casing forming process; a plating process of performing supply and discharge of a plating liquid into and from the easing through the opening parts to circulate the plating liquid and plating the inner surface of the casing after the surface activating process; and an assembling process of providing a rotating body that is rotatable relative to the casing so as to he covered from an outer circumference side by the casing plated in the plating process.

Abstract: A hub is supported rotatably about an axis of rotation, and the diameter thereof increases from upstream to downstream sides along a fluid flow. A plurality of impeller blades extend radially outward from an outer circumferential surface of the hub. A shroud is formed in a cylindrical shape whose diameter increases from the upstream to downstream sides along the fluid flow and joins outer circumferential ends of the plurality of impeller blades. The impeller blades are composed of upstream blade segments and downstream blade segments bonded at a bonding surface extending in a direction substantially perpendicular to the axis of rotation. The upstream blade segments are integral with at least a portion of the shroud, and the downstream blade segments are integral with at least a portion of the hub. This improves the reliability and performance of an impeller and a compressor.

Abstract: A method for manufacturing an impeller of a centrifugal rotating machine that is approximately disk-shaped and in which flow passages are formed between a plurality of blades and disposed in a radial manner from the inner circumferential side to the outer circumferential side, provided with a first flow passage formation step that forms a first region on the outer circumferential side within the flow passage by inserting an electrode of a shape fitting to the flow passage with the electric discharge machining method from the outer circumferential side of the disk-shaped body having an outer shape of an impeller, and a second flow passage formation step that forms a second region on the inner circumferential side within the flow passage from the inner circumferential side of the disk-shaped body.

Abstract: A component for a rotary machine which is configured such that a hard film composed of ceramics and an anti-fouling film composed of a fluorine-containing diamond-like carbon film are laminated on the surface of a base material, and which has superior drain erosion resistance and fouling resistance in an environment where a gas comes in direct contact therewith.

Abstract: A surface coating film includes, a base material which is a hard material; and an oxidation-resistance coating layer containing, as a main component, a complex oxide of Li and at least Al and covering a surface of the base material. Further, a method of manufacturing a surface coated member, includes, supporting a base material which is a hard material in a hermetic container with the use of a holder arranged in the container; arranging a complex oxide forming target containing Li and at least Al, as main components, in the container; feeding oxygen into the container; and forming an oxidation-resistance coating layer that covers the base material to obtain the surface coated member by effecting electric discharge between the complex oxide forming target as an anode and the holder as a cathode.

Abstract: In a part for a rotary machine, a ceramic hard film is formed on a surface of a base material, the density of droplets which exist in a surface of the ceramic hard film is set to be within 1000 pieces/mm2, and the density of droplets whose mean particle diameter is 1 ?m or less is set to be within 550 pieces/mm2. A method for manufacturing the part of a rotary machine is a method for forming the ceramic hard film by at least an ion plating method or a sputtering method.

Abstract: A hub is supported rotatably about an axis of rotation, and the diameter thereof increases from upstream to downstream sides along a fluid flow. A plurality of impeller blades extend radially outward from an outer circumferential surface of the hub. A shroud is formed in a cylindrical shape whose diameter increases from the upstream to downstream sides along the fluid flow and joins outer circumferential ends of the plurality of impeller blades. The impeller blades are composed of upstream blade segments and downstream blade segments bonded at a bonding surface extending in a direction substantially perpendicular to the axis of rotation. The upstream blade segments are integral with at least a portion of the shroud, and the downstream blade segments are integral with at least a portion of the hub. This improves the reliability and performance of an impeller and a compressor.

Abstract: A solid particle erosion resistant surface treated coating has a solid particle erosion resistance that is largely enhanced and a rotating member having the coating gains oxidation resistance without deteriorating a fatigue strength. Also, a rotating machine can have this coating applied thereto. The solid particle erosion resistant surface treated coating has a nitrided hard layer formed on a surface of a base material and a PVD (physical vapor deposition) hard layer of at least one layer formed on the nitrided hard layer by a PVD method. Deformation of the base material by collisions by solid particles is prevented and cracking of the coating is prevented. Thereby, the solid particle erosion resistance is secured, life of the solid particle erosion resistant surface treated coating can be increased and oxidation resistance and fatigue strength are enhanced.

Abstract: A component for a rotary machine which is configured such that a hard film composed of ceramics and an anti-fouling film composed of a fluorine-containing diamond-like carbon film are laminated on the surface of a base material, and which has superior drain erosion resistance and fouling resistance in an environment where a gas comes in direct contact therewith.