Abstract: In order to provide a further uniform carburizing treatment to an article to be treated, a carburizing treatment apparatus which performs carburizing treatment by heating the article to be treated in a treatment chamber, the inside of which is under reduced pressure and in a carburizing gas atmosphere, includes a temperature measurement means for measuring temperatures in a plurality of regions inside the treatment chamber and a temperature adjustment means for individually adjusting temperatures in the plurality of regions on the basis of measurement results of the temperature measurement means so that the article to be treated is given a uniform carburizing treatment.

Abstract: A method between a diffusion and a quenching process including normalizing by step cooling including alternating temperature lowering and temperature keeping treatment for a temperature history that satisfies a predetermined condition; after normalizing, maintaining the temperature of the whole workpiece so that the whole workpiece becomes the predetermined temperature, thereby producing fine crystal grains in the workpiece; then reheating the workpiece to raise its temperature to the second temperature. There is uniformity in temperature between the surface and the inside of a workpiece, and crystal grains are prevented from being coarse.

Abstract: This shaft seal structure has at a fitting portion between a container wall of a pressurized container in which high pressure gas is enclosed and a rotating shaft that passes through the container wall: O-rings that are disposed at least two locations in the axial direction of the rotating shaft; and grease that is pressurized.

Abstract: A cooling chamber is provided which cools workpieces that have been heated. Cooling units are provided in the cooling chamber, and respectively include: a conveyor which simultaneously and uniserially conveys a plurality of workpieces; a mist cooling device which is disposed so as to surround the conveyance path of the conveyor and which supplies mist-like cooling liquid; and a gas cooling device which is disposed so as to surround the conveyance path of the conveyor and which supplies cooling gas.

Abstract: A heat treatment furnace (10) used to perform heat treatment on a treatment target (1) includes a hollow heating chamber (20) in which the treatment target is housed and which is formed of a heat insulating member, a resistance heater (22) that is mounted in the heat insulating member, a hollow furnace body (12) that is spaced apart from the heating chamber by a gap and surrounds the heating chamber, a nozzle (16) that is provided to the furnace body so as to communicate with an interior of the furnace body, an electrode bar (30) that is removably mounted on an outer end of the nozzle and is electrically insulated from the nozzle, and a flexible conducting wire (32) that electrically connects a lead wire (23) of the heater and the electrode bar.

Abstract: A device is provided with a measurement window, which is provided in a heat treat furnace and which permits direct visual observation of a surface to be measured of a heat-treated workpiece, and a temperature sensor, which is provided outside the measurement window and which is capable of carrying out noncontact measurement of the surface temperature of the surface to be measured through the measurement window. The temperature sensor has a measurement wavelength range in which the absorptivity by water is low (e.g., 1.95 ?m to 2.5 ?m). Further, the measurement window is composed of a window material having a high transmittance in the measurement wavelength range (e.g., germanium).

Abstract: Provided is a plasma processing device (S1) configured to perform surface reforming on a workpiece (X) made of a metal material in a vacuum furnace (1) by plasma includes movable power feeding devices (14 and 15) that are movable in the vacuum furnace (1).

Abstract: A multi-chamber heat treatment device (S1) includes a plurality of treatment chambers having a heat treatment chamber, the device including: a cooling chamber (3) serving as the heat treatment chamber configured to cool a treatment target by latent heat of liquid particles; treatment chambers (1, 2) different from the cooling chamber (3); and drying devices (11, 19) configured to dry the cooling chamber (3).

Abstract: A vacuum carburization processing method includes a preparatory heating step of increasing the temperature of a workpiece in a heating chamber to a first temperature, a carburizing step of carburizing the workpiece by supplying carburizing gas into the heating chamber from a state where the pressure inside the heating chamber is reduced to an extremely low pressure, a diffusing step of terminating the supply of the carburizing gas and making carbon diffuse from a surface of the workpiece into its internal part, and a quenching step of abruptly cooling the temperature of the workpiece from a state where the temperature of the workpiece is at a second temperature; and also includes, between the diffusing step and the quenching step, a normalizing step of reducing the temperature of the workpiece so that the temperature history of the workpiece from the first temperature to a predetermined temperature satisfies predetermined conditions, a post-normalization maintaining step, performed after the normalizing step,

Abstract: The mist cooling apparatus (3) includes: a cooling system (30) which includes a nozzle (35, 35A) that sprays cooling liquid in a form of a mist onto a treatment object which has been heated and provided in a cooling furnace (10), and a pump (33) that is driven by a drive source and thereby makes the cooling liquid flow toward the nozzle (35, 35A); and a second cooling system (40) which operates in response to a stoppage of the drive source, and thereby cools the treatment object.

Abstract: The heat treatment method of the present invention includes: a first step of mist cooling a treatment object retained at a prescribed temperature by supplying mist-like coolant, to a target temperature near to and higher than a first transformation point at which a structure of the treatment object begins to be transformed into a prescribed structure; a second step, following the first step, of retaining the treatment object for a prescribed time in a state where supply of mist-like coolant is stopped; and a third step, following the second step, of cooling the treatment object to a temperature lower than or equal to the first transformation point. According to the present invention, it is possible to provide a heat treatment method capable of suppressing irregularity and deformation in the structure of the treatment object.

Abstract: The invention adopts a mist cooling apparatus (3) that cools a heated treated subject M by spraying a cooling mist thereto, the mist cooling apparatus including: a first nozzle (35) that sprays a cooling mist; and a second nozzle (45) that sprays a cooling mist having a particle diameter smaller than the particle diameter of the cooling mist sprayed from the first nozzle.

Abstract: A method between a diffusion and a quenching process including normalizing by step cooling including alternating temperature lowering and temperature keeping treatment for a temperature history that satisfies a predetermined condition; after normalizing, maintaining the temperature of the whole workpiece so that the whole workpiece becomes the predetermined temperature, thereby producing fine crystal grains in the workpiece; then reheating the workpiece to raise its temperature to the second temperature. There is uniformity in temperature between the surface and the inside of a workpiece, and crystal grains are prevented from being coarse.

Abstract: There are provided a method, between a diffusion process and a quenching process, a normalizing process of performing step cooling in which a temperature lowering treatment and a temperature keeping treatment are alternately repeated plural times so that a temperature history from the first temperature to a predetermined temperature satisfies a predetermined condition; an after-normalizing maintaining process of maintaining the temperature of the whole workpiece for a predetermined time after the normalizing process so that the whole workpiece becomes the predetermined temperature, thereby producing fine crystal grains in the workpiece; and a reheating process of raising the temperature of the workpiece to the second temperature, after the after-normalizing keeping process.

Abstract: A heat treatment device of the present disclosure is a heat treatment device including a cooling chamber (120) for cooling a heated treatment object (M), further including: a mist supply portion (20) for supplying a coolant in mist form into the cooling chamber; and a gas supply portion (30) for supplying a gas into the cooling chamber to adjust a flow direction of the coolant in mist form.

Abstract: The present invention relates to a heat treatment apparatus and a heat treatment method that control temperature distribution during cooling. There is provided a cooling step in which a heated treatment object is cooled using a cooling liquid in mist form, and heat treatment is performed by alternatingly repeating a first step (K1) in which the treatment object is cooled at a first mist density, and a second step (K2) in which the treatment object is cooled at a second mist density that is less dense than the first mist density.

Abstract: A cooling chamber is provided which cools workpieces that have been heated. Cooling units are provided in the cooling chamber, and respectively include: a conveyor which simultaneously and uniserially conveys a plurality of workpieces; a mist cooling device which is disposed so as to surround the conveyance path of the conveyor and which supplies mist-like cooling liquid; and a gas cooling device which is disposed so as to surround the conveyance path of the conveyor and which supplies cooling gas.