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1. 发明专利

JPH07116775A MOLD FOR CASTING METALLIC MOLD AND MANUFACTURE THEREOF AND CASTING METHOD USING IT 失效
公开(公告)号：JPH07116775A
公开(公告)日：1995-05-09
申请号：JP20174994
申请日：1994-08-26
申请人： HITACHI LTD
发明人： AIUCHI SUSUMU , HASHIDA SHIGEO , KAWAI ISAMU , YAMANAKA TOSHIAKI , TSURUHENJI KIWAMU , ARAKAWA HIROMI , YOKOYAMA YOJI , YOSHII MASAKI
IPC分类号： B22D27/20 , B22C3/00 , B22C9/06 , B22C23/02
摘要： PURPOSE:To form a thin molding sand layer excellent in collaps ibility on the surface of a metallic mold in good reproducibility and high productivity by assembling a forming mold with the metallic mold and filling the molding sand coated with thermosetting resin into a prescribed gap formed between the metallic mold and the forming mold. CONSTITUTION:The forming mold 4 having the same shape as the surface shape of a cast product is assembled with the metallic mold 1 and the gap 6 for forming the molding sand layer having the prescribed thickness is arranged. Blowing pipes 7 are inserted into blowing holes 5 arranged in the metallic mold 1 and the molding sand 8 precoating the surface with the thermosetting resin through the blowing pipes 7 is filled into the gap 6. The metallic mold 1 and the forming mold 4 are preheated to a prescribed temp. in a metallic mold temp. control process, and after filling the molding sand 8, hardening reaction of the thermosetting resin is progressed by the heat from the metallic mold 1 and the forming mold 4. The thermosetting resin combines mutual sand grains to form the molding sand layer 9 having the prescribed thickness on the metallic mold 1.

2. 发明专利

JPH05288473A 失效
公开(公告)号：JPH05288473A
公开(公告)日：1993-11-02
申请号：JP8529492
申请日：1992-04-07
申请人： HITACHI LTD
发明人： KAWAI ISAMU , HASHIDA SHIGEO , ANAHARA TATSUISA , SAKAMOTO HARUJI , IMAI MASAYOSHI , TERAUCHI MASAO
IPC分类号： F27B14/10 , F27D1/00
摘要： PURPOSE:To obtain a method for constructing a wall of a furnace to reduce damage of refractory material due to electric discharge in a method for constructing the wall of a continuous induction melting furnace. CONSTITUTION:A high thermal conductive refractory material 13 is constructed on a wall of a continuous induction melting furnace and a low thermal conductive refractory material 14 is constructed on the surface of the material 13. Since an electric discharge to be generated between the wall and a carbon material to be heated is reduced, damage of the refractory material is reduced, and continuous operation of the furnace is performed.

3. 发明专利

JPH11201429A METHOD AND DEVICE FOR MELTING BY GASIFICATION 失效
公开(公告)号：JPH11201429A
公开(公告)日：1999-07-30
申请号：JP131598
申请日：1998-01-07
申请人： HITACHI LTD
发明人： HASHIDA SHIGEO , KAWAI ISAMU
IPC分类号： F23G5/24 , F23G5/44 , F23J1/02
摘要： PROBLEM TO BE SOLVED: To relatively simply prevent generation of dioxin and the like by introducing burned gas into a high temperature cake furnace without a use of the burned gas for preheating and gasification of unburned substance and a need for separating a gasifying section and a melting section or for a high level of combustion control technology. SOLUTION: Coke 10 is filled, wood is placed thereon and burned, and air is injected from an air intake 7 to burn the cake 10. Then, a molten substance 9 for gasification combined with a scrap wood, scrap plastics and the like, and cake of a specified quantity are further combined and loaded, an amount of air is reduced from the air intake, and an air blasting is started from a first tuyere 2 and a second tuyere 4. In this manner, as combustion gas is discharged from a gas discharge port 5 located in a part lower than the air intake 7, a first tuyere 3, and the second tuyere 4, and opened into a layer of the cake 10, air introduced from the air intake 7, the first tuyere 3, and the second tuyere 4 certainly passes through a coke layer of high temperature.

4. 发明专利

JPH05237468A 失效
公开(公告)号：JPH05237468A
公开(公告)日：1993-09-17
申请号：JP3926892
申请日：1992-02-26
申请人： HITACHI LTD
发明人： HASHIDA SHIGEO , MATSUNOBU KENJI , UEHARA KATSUJI , NISHIKAWA KIYOYUKI , KAWAI ISAMU
IPC分类号： B09B3/00 , C22B7/00
摘要： PURPOSE:To perform the melting treatment of incineration ash so that incineration ash is directly charged in a heating and melting apparatus to be efficiently melted and the valuable metals contained in the incineration ash are effectively recovered as resources. CONSTITUTION:A slag outlet 2 is provided to the bottom of an apparatus and an incineration ash charging port 3 is provided to the upper part of the apparatus and a carbon material 14 is arranged to the bottom part of the apparatus as a heating medium to be heated by an induction coil 5 and incineration ash 15 is continuously charged from the charging port 3 to be melted while the molten matter is taken out of the slag outlet 2. Finally, the nonmetallic component 18 and metal component 19 in the molten ash are separated by a separator 12 to be recovered. Further, by melting the incineration ash of urban waste refuse to obtain a harmless vitreous substance and metals reduced in volume, the security of a final disposal place is facilitated and valuable metals can be recovered. By setting the recovery form of the molten matter to a particulate or molded form, the molten matter can be utilized as various building materials.

5. 发明专利

JPH1060572A FINE GRAPHITE CAST IRON AND ITS PRODUCTION 失效
公开(公告)号：JPH1060572A
公开(公告)日：1998-03-03
申请号：JP22270296
申请日：1996-08-23
申请人： HITACHI LTD
发明人： KAWAI ISAMU , HASHIDA SHIGEO
IPC分类号： B22D27/20 , C22C33/08 , C22C37/00
摘要： PROBLEM TO BE SOLVED: To easily produce a fine graphite cast iron product excellent in machinability, strength and rigidity by a sand mold casting method by incorporating the molten metal of cast iron with Mn, Ti or the like together with a specified amt. of Bi or Te. SOLUTION: A raw material 1 such as a casting return scrap, casting cutting powder, steel sheet pressing chips or the like is charged to a melting furnace 3 and is melted, and the molten metal 5 of cast iron contg., by weight, 3.4 to 3.7%. C, 2.3 to 2.9%, Si, 0.1 to 0.9% P, 0.6 to 1% Mn, 0.05 to 0.2% S and 0.05 to 0.2% Ti is flowed into a holding furnace 4. Next, while the molten metal 5 is poured into a ladle 6, as the material 7 to be added, to 100 pts.wt. the molten metal 5, at least either 0.01 to 0.05 pts.wt. Bi or 0.001 to 0.01 pts.wt. Te and 0.2 to 1 pts.wt. Mn are added, by which the fine graphite cast iron product contg., by weight, 0.001 to 0.03% Bi or 0.0003 to 0.005% Te, 0.5 to 2% Mn and 0.05 to 0.2% Ti can easily be produced by sand mold casting.

6. 发明专利

JPH06158189A METHOD FOR HEATING AND DISSOLVING METAL AND DEVICE THEREFOR 失效
公开(公告)号：JPH06158189A
公开(公告)日：1994-06-07
申请号：JP31687392
申请日：1992-11-26
申请人： HITACHI LTD
发明人： HASHIDA SHIGEO , KAWAI ISAMU , TSURUHEI KIWAMU , ARAKAWA HIROMI , ANAHARA TATSUNARI , SUGANO HIDEKI
IPC分类号： C22B9/02 , C22B9/05 , C22B9/16 , F27B1/09 , H05B6/22 , H05B6/34
摘要： PURPOSE:To obtain the molten metal having necessary temp. by dissolving a material to be melted such as scrup by induction heating directly, introducing the melted metal to a heating part and further subjecting to induction heating. CONSTITUTION:The material to be melted 6 thrown into a preheat dissolving part 1 is preheated and dissolved with an induction coil 1a, a fused material is puddled at a heating part through a connecting part 3 and heated with the induction coil 2a up to necessary temp. to become molten metal 7. The molten metal 7 is taken out properly by opening a gate 4 and various gases are introduced from the introducing port 5 of an atmosphere gas, if neccessary. Moreover, the molten metal can be taken out continuously if the gate is kept open. In this way, a metallic material can be dissolved and taken out continuously by this induction heating method, whereas, the conventional method of which can only dissolve intermittently. The atmosphere during the dissolving can be controlled freely and high efficient dissolving is executed and the separation recovering of the zinc, etc., in a zinc steel is possible by providing a cooling plate at preheating part.

7. 发明专利

JPH05231777A METHOD AND DEVICE FOR HEATING AND MELTING MATERIAL 失效
公开(公告)号：JPH05231777A
公开(公告)日：1993-09-07
申请号：JP5645891
申请日：1991-03-20
申请人： HITACHI LTD
发明人： HASHIDA SHIGEO , KAWAI ISAMU , SUGANO HIDEKI
IPC分类号： F27B14/06 , F27B14/20 , F27D11/06 , F27D19/00
摘要： PURPOSE:To provide a melting method and device for a continuous induction melting furnace for performing a continuous supplying of molten metal of high quality and having a stable temperature. CONSTITUTION:A hot melted metal feeding-out port 12 and a dam 13 for staying the melted metal are installed at a furnace bottom part of an induction melting furnace. A continuous induction melting furnace having an upper part of the furnace as a material feeding inlet 10 is operated such that a ratio of quantity of heat applied to melted metal stayed at the furnace bottom part, a carbon material 1 accumulated within the furnace 1 and a melted material 2 fed at a feeding port 10 is controlled by an electrical power control device 14. The ratio of quantity of heat is applied to the melted metal staying there, the carbon material and the melted material can be adjusted, resulting in that the temperature of the melted metal is stabilized, and the metal is refined within strong reducing atmosphere with less gas flowability and then the superior quality metal having a shallow chill depth can be attained.

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