A wire electrical discharge machine to cut a workpiece by generating an electrical discharge in a dielectric working fluid between wire electrodes arranged in parallel and the workpiece includes: a work tank that stores the dielectric working fluid; a Z-axis stage that is disposed in a lower portion of the work tank and moves the workpiece in a Z-axis direction that is a vertical direction; a pillar that extends upward from the Z-axis stage and has an upper end portion located above the highest level of a fluid level of the dielectric working fluid in the work tank; an adjuster that is installed downward from a portion of the pillar located above the highest level of the fluid level, is disposed above the highest level of the fluid level, and adjusts the position or posture of the workpiece in a direction other than the vertical direction.

A machining failure detection device includes a machining light measurement unit that measures machining light generated at a machining point during machining; a machining sound measurement unit that measures machining sound generated at the machining point; and a computation unit that determines whether a machining failure has occurred in the machining. The computation unit includes a feature extraction unit, a determination value calculation unit, and a determination unit. The feature extraction unit extracts a machining light feature from a machining light signal measured by the machining light measurement unit, and extracts a machining sound feature from a machining sound signal measured by the machining sound measurement unit. The determination value calculation unit calculates a combined failure determination value on the basis of the machining light feature and the machining sound feature. The determination unit compares the combined failure determination value with a determination criterion to determine a failure.

A machining failure detection device includes a machining light measurement unit that measures machining light generated at a machining point during machining; a machining sound measurement unit that measures machining sound generated at the machining point; and a computation unit that determines whether a machining failure has occurred in the machining. The computation unit includes a feature extraction unit, a determination value calculation unit, and a determination unit. The feature extraction unit extracts a machining light feature from a machining light signal measured by the machining light measurement unit, and extracts a machining sound feature from a machining sound signal measured by the machining sound measurement unit. The determination value calculation unit calculates a combined failure determination value on the basis of the machining light feature and the machining sound feature. The determination unit compares the combined failure determination value with a determination criterion to determine a failure.

A method for restoring a blade or vane platform of a gas turbine assembly configured for a power plant by: providing a blade or a vane having a platform with an edge deterioration zone; removing the deterioration zone by electro discharging machining technology; and rebuilding a removed zone by additive manufacturing technology. The removing can be performed to create a recessed plane along a platform edge, the recessed plane being connected to a platform plane by an enter inclined plane and an exit inclined plane arranged opposed along the platform edge.

The invention provides a method for machining a shape such as slot or cavity or aperture using a plurality of first type holes (1) and second type holes (2), wherein during machining of first type holes (1) the hole circumference completely envelopes the respective portion of the electrode circumference.

The invention provides a method for machining a shape such as slot or cavity or aperture using a plurality of first type holes (1) and second type holes (2), wherein during machining of first type holes (1) the hole circumference completely envelopes the respective portion of the electrode circumference.

Provided is a hot-dip galvanized steel sheet to be used for home appliances, vehicles, and the like, and having excellent surface appearance and low-temperature bonding brittleness. The hot-dip galvanized steel sheet includes: a base steel sheet; and a hot-dip galvanized layer formed on the base steel sheet. A surface of the base steel sheet has a centerline average roughness (Ra) of 0.3 or more, a roughness skewness (Rsk) of −1 or less, and a roughness kurtosis (Rku) of 6 or more.

Method for manufacturing at least one part (8) of electroconductive material by additive manufacturing on a bed of powder characterized in that it comprises the steps of manufacturing the part on a support plate of a first additive manufacturing machine, layer by layer, said part being bounded by an external contour surface portion which is opposite and spaced apart from said support plate, and which is connected to said support plate by at least one bridge of support material of the part, providing a reference element (51) on the support plate in a predetermined position, mounting said support plate on a second machine (60) for cutting said at least one part, and using a wire (62-66) of said second machine for cutting by electrical discharge machining said at least one part by passing it between said at least one part and said support plate, along and at the level of said surface portion.

A method for producing a cavity in a blade platform of a blade, in particular of a turbine blade, as part of a blade-platform cooling system, wherein the method has the steps of: producing a first bore from a first platform lateral face in the direction of an opposite second platform lateral face, with a first opening in the first platform lateral face being created, and expanding the first bore in a fan-like manner by an electrical discharge machining method, in particular using a wire- or bar-form electrode, such that the first opening, created in the first step, of the first bore represents the starting point of the fan-like expansion. A blade is produced in particular with such a method.

A method for producing a cavity in a blade platform of a blade, in particular of a turbine blade, as part of a blade-platform cooling system, wherein the method has the steps of: producing a first bore from a first platform lateral face in the direction of an opposite second platform lateral face, with a first opening in the first platform lateral face being created, and expanding the first bore in a fan-like manner by an electrical discharge machining method, in particular using a wire- or bar-form electrode, such that the first opening, created in the first step, of the first bore represents the starting point of the fan-like expansion. A blade is produced in particular with such a method.