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1. 发明专利

JPS62149810A METHOD AND APPARATUS FOR HEAT TREATMENT 失效
公开(公告)号：JPS62149810A
公开(公告)日：1987-07-03
申请号：JP29000885
申请日：1985-12-23
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , SHIMURA HIROSHI , ABUKAWA FUMIO , GOI HITOSHI , FUJITA KAZUYOSHI , YOKOSE KEIJI , KAWAMURA TOSHIYUKI , KIINA MASASHIGE
IPC分类号： C21D1/74 , C21D1/76
摘要： PURPOSE:To effectively and easily remove the soot generated in a gaseous raw material supply part by connecting a pressurized air supply pipe to a gaseous raw material supply path and supplying the pressurized air in synchronization with the door opening in the stage of charging a work. CONSTITUTION:The inside of a heat treatment furnace 1 is controlled to a prescribed temp. by a heater 20. The gases from a gaseous hydrocarbon source 7 and an oxidative gas source 8 are mixed to a prescribed ratio and the mixture is supplied through the gas supply pipe 5 and supply path 4 into the furnace 1 where the heat treatment of the work X is executed in a prescribed atmosphere. A stop valve 6 for the gas supply pipe 5 is closed to open a stop valve 10 for the pressurized air supply pipe 11 when the soot is generated in the path 4 or in synchronizing with the door opening for charging of the work X. As a result, the pressurized air is fed from the path 4 and the soot in the path 4 is forcibly removed.

2. 发明专利

JPS6233718A METHOD FOR SEASONING ATMOSPHERIC HEAT TREATING FURNACE 失效
公开(公告)号：JPS6233718A
公开(公告)日：1987-02-13
申请号：JP17218985
申请日：1985-08-05
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , SHIMURA HIROSHI , ABUKAWA FUMITAKA , GOI HITOSHI , FUJITA KAZUYOSHI , TAKASU YUICHI
IPC分类号： C21D1/76 , C21D1/74 , C23C8/20
摘要： PURPOSE:To considerably shorten the time required to reoperate an atmospheric heat treating furnace by heating the furnace to a temp. necessary for reoperation and introducing gaseous hydrocarbon into the furnace by an amount specified times the amount of gaseous hydrocarbon used during an operation so as to carry out seasoning. CONSTITUTION:The atmospheric heat treating furnace is heated to a temp. necessary for reoperation, gaseous hydrocarbon is introduced into the furnace by an amount 2-5 times the amount of gaseous hydrocarbon used during the operation, and C and H having high activity are generated by thermal decomposition. Butane, propane or methane may be used as the hydrocarbon. Thus, parts can be charged into the furnace within 2-3hr after the heating.

3. 发明专利

JPS6233754A GAS CARBURIZING HEAT TREATMENT 失效
公开(公告)号：JPS6233754A
公开(公告)日：1987-02-13
申请号：JP17218885
申请日：1985-08-05
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , SHIMURA HIROSHI , ABUKAWA FUMITAKA , GOI HITOSHI , FUJITA KAZUYOSHI , TAKASU YUICHI
IPC分类号： C23C8/22 , C21D1/18
摘要： PURPOSE:To improve the fatigue strength of steel by raising rapidly a carbon potential just before a temp. appropriate to hardening is reached in the process of temp. fall after carburizing treatment, carrying out hardening and then subjecting retained austenite to martensite transformation. CONSTITUTION:In the process of temp. fall after the carburizing and dispersing treatment of steel, the carbon potential in a range of about 5min just before the temp. appropriate to hardening is reached is raised rapidly, for example, by stopping the supply of air between hydrocarbon such as butane and air to be supplied and feeding ammonia instead. After that, the carbon potential is restored to the ordinary state and hardening is carried out. Successively, retained austenite is subjected to martensite transformation by shot peening. Consequently, residual stress is increased simultaneously with the hardening of a surface layer, so that fatigue strength can be improved.

4. 发明专利

JPS6233753A CONTROL METHOD FOR ATMOSPHERIC GAS 失效
公开(公告)号：JPS6233753A
公开(公告)日：1987-02-13
申请号：JP17219085
申请日：1985-08-05
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , SHIMURA HIROSHI , ABUKAWA FUMITAKA , GOI HITOSHI , FUJITA KAZUYOSHI , TAKASU YUICHI
IPC分类号： C23C8/22 , C23C8/20
摘要： PURPOSE:To stabilize atmosphere in furnace, by arranging an oxygen sensor in furnace to detect oxygen concn. in furnace and controlling air supplying quantity basing on the signal. CONSTITUTION:A fixed quantity of material gas is always supplied into an atmospheric heat treating furnace 1 from a material gas source 2. Oxygen enters at opening or closing door or from door sealing part. Furnace inside oxygen partial pressure is obtd. from electromotive force from the oxygen sensor 6 arranged in the furnace 1 and furnace inside temp. measured by a thermocouple 7. At a controller 8, air quantity required to material gas supplied quantitatively and furnace inside oxygen quantity are compared and calculated. The deficit air is supplied in the furnace 1 from an air supplying source 4. By this method, disturbance of atmosphere in the furnace 1 is prevented and complete sealing of the furnace 1 is made unnecessary.

5. 发明专利

JPS63149366A GAS CARBURIZING METHOD 失效
公开(公告)号：JPS63149366A
公开(公告)日：1988-06-22
申请号：JP29630386
申请日：1986-12-12
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , GOI HITOSHI , ABUKAWA FUMITAKA , SHIMURA HIROSHI , FUJITA KAZUYOSHI , YOKOSE KEIJI
IPC分类号： C23C8/20 , C23C8/02
摘要： PURPOSE:To eliminate a separate stage for removing processing oil sticking to a product to be treated by feeding only an oxidizing gas into a carburizing furnace while the oil remains in the furnace and by feeding gaseous hydrocarbon and the oxidizing gas. CONSTITUTION:A product to be treated is put in a carburizing furnace and only air as an oxidizing gas is fed into the furnace while cutting oil or the like sticking to the product remains in the furnace. The oil is thermally decomposed to produce CO or CO2 and the amt. of deposited carbon can be reduced by continuing the feed of the oxidizing gas. After the concn. of CO2 is measured and a state in which carburization is smoothly carried out is confirmed, gaseous hydrocarbon and the oxidizing gas are fed into the furnace to carburize the product.

6. 发明专利

JPS62146220A ATMOSPHERE HEAT TREATING FURNACE 失效
公开(公告)号：JPS62146220A
公开(公告)日：1987-06-30
申请号：JP28722985
申请日：1985-12-20
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , SHIMURA HIROSHI , ABUKAWA FUMIO , GOI HITOSHI , FUJITA KAZUYOSHI , YOKOSE KEIJI , KAWAMURA TOSHIYUKI , KIINA MASASHIGE
IPC分类号： C21D1/74 , C21D1/76
摘要： PURPOSE:To reduce soot generated in a supplying path for row material gas, by connecting a supplying path for oxidizing gas to a prescribed position of the row material gas supplying path provided at ceiling of the titled furnace to which the row material gas and oxidizing gas are directly supplied. CONSTITUTION:A stirring fan 2 is provided at ceiling part of a furnace 1 and supported with a fan shaft 3. The supplying path 4 for row material gas opening toward the furnace 1 interior is formed at the shaft 3 part. Further at a suitable furnace side situation in the path 4, concretely, above a sooting temp. range X, the path 5 for supplying oxidizing gas is connected. Gaseous hydrocarbon is supplied from the path 4 and a quantity of air required by the gaseous hydrocarbon is supplied from the path 5. As the result, gaseous hydrocarbon and air are mixed, supplied and diffused in furnace, thermally decomposed to a prescribed atmosphere by heat of a heater 6, and a work 7 is heat treated. At this time, O2 in air supplied from the path 5 reacts and CO is formed to prevent occurrence of soot.

7. 发明专利

JPS62129683A METHOD OF THERMALLY TREATING ATMOSPHERE 失效
公开(公告)号：JPS62129683A
公开(公告)日：1987-06-11
申请号：JP26815985
申请日：1985-11-28
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , SHIMURA HIROSHI , ABUKAWA FUMITAKA , GOI HITOSHI , FUJITA KAZUYOSHI , YOKOSE KEIJI , KAWAMURA TOSHIYUKI , KIINE MASASHIGE
IPC分类号： F27D7/04 , C21D1/74 , C21D1/76 , C21D1/767 , F27D7/02

8. 发明专利

JPH01255619A METHOD FOR COOLING STEEL 失效
公开(公告)号：JPH01255619A
公开(公告)日：1989-10-12
申请号：JP8277188
申请日：1988-04-04
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , ABUKAWA FUMITAKA , GOI HITOSHI , FUJITA KAZUYOSHI , KITAMOTO KENICHI , TAKASU YUICHI
IPC分类号： C21D1/00 , C21D1/28
摘要： PURPOSE:To produce a rapid and uniform cooling effect with a small-sized cooling chamber and to economically and effectively carry out normalizing by utilizing the latent heat of vaporization for the cooling in the normalizing of a case-hardened steel. CONSTITUTION:A steel member 8 heated to a normalizing temp. in a heating chamber 1 is placed in a cooling chamber 2, and cooled. In this case, plural tubes 3 are arranged in the cooling chamber 2, and connected to a communicating tube 4. The insides of the tubes 3 are filled with hot water at a temp. immediately below the boiling temp. The temp. in the cooling chamber 2 is rapidly raised by the heat of the steel member 8 transferred to the cooling chamber 2 from the heating chamber 1, and the tubes 3 are also heated. As a result, the hot water in the tube is boiled, and violently vaporized. Meanwhile, the temp. of the periphery of the tube 3 is rapidly lowered by the latent heat of vaporization, the air surrounding the tube is cooled, and the steel member 6 is quenched by the cooled air circulated by a agitating fan 5. When the steel member 8 is cooled below 500 deg.C, the fan 5 is stopped, cooling is changed to annealing, and heat treatment free of strains is effectively carried out in the cooling chamber of a small size.

9. 发明专利

JPH01252723A METHOD FOR PREVENTING OXIDATION OF ATMOSPHERE 失效
公开(公告)号：JPH01252723A
公开(公告)日：1989-10-09
申请号：JP7965788
申请日：1988-03-31
申请人： TOKYO HEAT TREATING
发明人： NANBA KEISHICHI , ABUKAWA FUMITAKA , GOI HITOSHI , FUJITA KAZUYOSHI , KITAMOTO KENICHI , KONAGAYA HIROYUKI
IPC分类号： C21D1/76
摘要： PURPOSE:To prevent the flowing of an oxidizing atmosphere into a heating chamber and further to prevent the turbulence of the atmosphere in the heating chamber by sucking raw gas and air into the heating chamber when evacuated, and thermally decomposing the gaseous mixture to form a reducing gas in the heating chamber. CONSTITUTION:Solenoid valves 14 and 15 are opened along with the movement of a high-temp. work to introduce a mixture contg. an appropriate ratio of the raw gas such as propane and air (oxygen) into ring burners 11 and 13 when the heating chamber H is evacuated. In this case, the opening degree of the valves 14 and 15 is controlled so that a small amt. of air is left after the combustion in the burner 11. The gas is ignited in the burner 13, but incompletely burned due air deficiency at the combustion port 12. Concretely, the combustion is adjusted based on the flame lengths of the burners 11 and 13. A solenoid 7 is then energized, and a stop valve 2 is opened to introduce the external air freed of oxygen into the heating chamber H. Since the chamber H is held at high temp., the sucked raw gas and air are thermally decomposed to form a reducing gas, and the oxidation is prevented. The vacuum in a furnace is simultaneously turned off, and hence the turbulence of the atmosphere in the chamber H can be prevented.

10. 发明专利

JPS6345359A GAS CARBURIZING METHOD 失效
公开(公告)号：JPS6345359A
公开(公告)日：1988-02-26
申请号：JP18901586
申请日：1986-08-12
申请人： MITSUBISHI MOTORS CORP , TOKYO HEAT TREATING
发明人： NISHIOKA NOBUO , KISHITA TADAYOSHI , SHIMIZU YOSHIAKI , NANBA KEISHICHI , SHIMURA HIROSHI , ABUKAWA FUMITAKA , GOI HITOSHI , FUJITA KAZUYOSHI , TAKASU YUICHI
IPC分类号： C23C8/20 , C23C8/22 , F27B9/04
摘要： PURPOSE:To prevent the deterioration of quality of a work by supplying the combustion gas of a gaseous hydrocarbon through a vent part for ventilation connected to a feed chamber or take-out chamber to restore the pressure therein to a prescribed pressure state when the pressure in said chamber drops to the prescribed pressure or below. CONSTITUTION:The pressure in the chambers 2, 3 drops to the pressure (negative pressure) lower than the prescribed pressure when the door of the feed chamber 2 is opened to feed the work to be treated or when the door of the take-out chamber 3 is opened to take out the carburized work. The gaseous hydrocarbon having approximately the same compsn. as the compsn. of the carburizable atmosphere gas in a main furnace 1 is burned on the outside of the chambers 2, 3 at this time and the combustion gas in such high-temp. state is supplied through the vent part 5 for ventilation to the chambers 2, 3. The internal pressures of the chambers 2, 3 are restored up to the prescribed pressure state by the supply of said combustion gas, by which the inflow of the air in the low-temp. state into the chambers 2, 3 is prevented. The compsn. change of the above-mentioned atmosphere gas is thereby obviated and the quantity deterioration of the work is prevented.

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