An electric discharge machining apparatus includes a tool electrode that performs electric discharge machining to a workpiece, a housing in which the tool electrode is inserted, a compressed gas supplying device for supplying compressed gas into a mist generating region which is provided between an inner wall of the housing and the tool electrode, a first flow path through which the compressed gas flows and connecting the compressed gas supplying device with the mist generating region, a pressurized working fluid supplying device for supplying pressurized working fluid into the mist generating region, and a second flow path through which the pressurized working fluid flows and connecting the pressurized working fluid supplying device with the mist generating region.

An electric discharge machining apparatus includes a tool electrode that performs electric discharge machining to a workpiece, a housing in which the tool electrode is inserted, a compressed gas supplying device for supplying compressed gas into a mist generating region which is provided between an inner wall of the housing and the tool electrode, a first flow path through which the compressed gas flows and connecting the compressed gas supplying device with the mist generating region, a pressurized working fluid supplying device for supplying pressurized working fluid into the mist generating region, and a second flow path through which the pressurized working fluid flows and connecting the pressurized working fluid supplying device with the mist generating region.

Provided is a lifetime prediction device and a machine tool that enable simple prediction of the lifetime of a filter while suppressing a prediction error with respect to a true value. A lifetime prediction device (88) according to one embodiment is provided with: a pressure acquisition unit (90) that acquires in time series a pressure value of a liquid applied to a filter (52); a time acquisition unit (92) that acquires processing time of a designated process; a calculation unit (94) that calculates the amount of pressure change during the processing time; and a prediction unit (96) that predicts a lifetime period before an upper limit value of the pressure of the liquid applied to the filter (52) is reached, by using the pressure value, the processing time, and the pressure change amount at the time of completion of the designated process.

Provided is a lifetime prediction device and a machine tool that enable simple prediction of the lifetime of a filter while suppressing a prediction error with respect to a true value. A lifetime prediction device (88) according to one embodiment is provided with: a pressure acquisition unit (90) that acquires in time series a pressure value of a liquid applied to a filter (52); a time acquisition unit (92) that acquires processing time of a designated process; a calculation unit (94) that calculates the amount of pressure change during the processing time; and a prediction unit (96) that predicts a lifetime period before an upper limit value of the pressure of the liquid applied to the filter (52) is reached, by using the pressure value, the processing time, and the pressure change amount at the time of completion of the designated process.

An electrode applied in electro-machining processes, where the electrode includes a main body portion and at least one built-in internal flushing passage for introducing a flushing liquid to a volume between the electrode and a workpiece to be machined. The electrode is made by an additive fabrication process that enables specialized flushing for enhancing waste material evacuation and incorporate special material properties like zones of high electrical conductivity and thermal resistance. The fabrication process produces materials and geometries that could not otherwise be made using conventional processing.

An electrode applied in electro-machining processes, where the electrode includes a main body portion and at least one built-in internal flushing passage for introducing a flushing liquid to a volume between the electrode and a workpiece to be machined. The electrode is made by an additive fabrication process that enables specialized flushing for enhancing waste material evacuation and incorporate special material properties like zones of high electrical conductivity and thermal resistance. The fabrication process produces materials and geometries that could not otherwise be made using conventional processing.

Electrode for an electro-erosion process, includes a shaft, a body coupled to the shaft, a plurality of machining-inserts, an insulated layer, and a flushing cover disposed on the body and coupled to the shaft. The shaft includes a channel, a plurality of first and second openings, each opening connected to the channel. The body includes a plurality of main-flushing channels, each channel connected to a corresponding first opening. The plurality of machining-inserts is spaced apart from each other along a circumferential direction and detachably coupled to a peripheral end portion of the body. Each machining-insert includes at least one third opening connected to a corresponding main-flushing channel. The insulated layer is disposed on top and bottom surfaces of the body. The flushing cover includes a plurality of side-flushing channels and a plurality of fourth openings, each channel connected to a corresponding second opening.

A substrate processing apparatus includes a substrate rotator, a processing liquid supply, an anode and a cathode, and a controller. The substrate rotator is configured to hold and rotate a substrate. The processing liquid supply is configured to supply a processing liquid to the substrate held by the substrate rotator. The anode and the cathode are configured to apply a voltage to the processing liquid supplied from the processing liquid supply. The controller is configured to control the substrate rotator, the processing liquid supply, and the anode and the cathode. The controller allows, by contacting the anode and the cathode with the processing liquid independently, the processing liquid in contact with the anode and the processing liquid in contact with the cathode to be supplied to the substrate while being spaced apart from each other when the substrate is rotated.

An electrical discharge machine includes a critical angle detection device that detects a critical angle of a machining fluid in which a corrosion inhibitor is added. The critical angle detection device includes a prism, a light source, an image sensor, an electrical circuit, and a slit. The prism has an incident surface, a boundary surface, a reflection surface, and an emission surface. The light source irradiates an incident light from the incident surface to the boundary surface. The image sensor includes a plurality of photodetectors that detect a reflection light. The electrical circuit calculates the critical angle by arithmetically processing output signals output from the plurality of photodetectors. The slit is arranged on an optical axis of the reflection light between the prism and the image sensor to block a scattered light.

An electrical discharge machine includes a critical angle detection device that detects a critical angle of a machining fluid in which a corrosion inhibitor is added. The critical angle detection device includes a prism, a light source, an image sensor, an electrical circuit, and a slit. The prism has an incident surface, a boundary surface, a reflection surface, and an emission surface. The light source irradiates an incident light from the incident surface to the boundary surface. The image sensor includes a plurality of photodetectors that detect a reflection light. The electrical circuit calculates the critical angle by arithmetically processing output signals output from the plurality of photodetectors. The slit is arranged on an optical axis of the reflection light between the prism and the image sensor to block a scattered light.