Patent application number | Description | Published |
20080216922 | VACUUM CARBURIZATION METHOD AND VACUUM CARBURIZATION APPARATUS - 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. According to the invention, even when a process temperature is set high to make rapid progress of carburization and diffusion and thus the process time is shortened, uniformity in temperature is achieved between a surface and a inside of a workpiece by the high-temperature process and crystal grains are prevented from being coarse, thereby obtaining a workpiece having a predetermined property value. | 09-11-2008 |
20090186311 | SEAL STRUCTURE, COOLING TREATMENT APPARATUS, MULTI-CHAMBER HEAT TREATMENT APPARATUS, PRESSURE REGULATING METHOD, OPERATING METHOD - 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. | 07-23-2009 |
20090261077 | HEAT TREATMENT HOLDER AND HEAT TREATMENT APPARATUS AND METHOD - The object of the present invention is suppression of a cost increase of a heat treatment holder as well as achievement of equalization of heater output and improvement of thermal efficiency by broadening the selection scope of materials of the heat treatment holder (particularly, materials of the resistance heating element). In the present invention, in the case of performing heat treatment on an object to be treated, as a heat treatment holder that holds the object to be treated and heats the object to be treated by undergoing resistance heating by carrying electric current from an external source, one is used that is formed by a resistance heating material having a specific resistance higher than a base material of the resistance heating element being mixed in the base material. | 10-22-2009 |
20120028202 | HEAT TREATMENT DEVICE AND HEAT TREATMENT METHOD - A heat treatment device of the present disclosure is a heat treatment device including a cooling chamber ( | 02-02-2012 |
20120180717 | VACUUM CARBURIZATION METHOD AND VACUUM CARBURIZATION APPARATUS - 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. | 07-19-2012 |
20120242014 | MIST COOLING APPARATUS, HEAT TREATMENT APPARATUS, AND MIST COOLING METHOD - The invention adopts a mist cooling apparatus ( | 09-27-2012 |
20130008567 | HEAT TREATMENT METHOD - 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. | 01-10-2013 |
20130032977 | MIST COOLING APPARATUS AND HEAT TREATMENT APPARATUS - The mist cooling apparatus ( | 02-07-2013 |
20130153547 | MULTI-CHAMBER HEAT TREATMENT DEVICE - A multi-chamber heat treatment device (S | 06-20-2013 |