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11. 发明授权

US4700769A Casting apparatus for titanium or titanium alloy 失效
标题翻译：钛合金或钛合金铸造设备
公开(公告)号：US4700769A
公开(公告)日：1987-10-20
申请号：US746101
申请日：1985-06-18
申请人： Isao Ohara , Seizo Nakamura
发明人： Isao Ohara , Seizo Nakamura
IPC分类号： B22D21/00 , B22D27/02
CPC分类号： B22D21/005 , B22D27/02
摘要： Improved casting of titanum or alloy of titanium is obtained by using a crucible and a mold made of high-purity magnesium oxide and/or zirconium oxide. It is also possible for only the interior portion of the crucible to be made of such high-purity material, or for the mold to be made of copper or an alloy of copper. The mold and crucible can be used in a centrifugal-type casting machine or a compression-type casting machine. In either machine, discharge vents must be provided in the mold to connect the casting chamber with the outer atmosphere. An argon electric arc generated between a pivotable, tiltable cathode and an anode may be used for melting the titanium in the crucible. A high-frequency electric current can also be used to melt the titanium. By using the above apparatus, it is possible to obtain castings which are dimensionally accurate and do not have an external layer of fragile metal oxide or rough cavities.
摘要翻译：通过使用坩埚和由高纯度氧化镁和/或氧化锆制成的模具，可以获得钛或钛合金的改进铸造。坩埚的内部部分也可以由这种高纯度材料制成，也可以由铜或铜合金制成。模具和坩埚可用于离心式铸造机或压缩型铸造机。在任一机器中，必须在模具中提供排气口以将铸造室与外部大气连接。在可枢转的可倾斜阴极和阳极之间产生的氩电弧可用于熔化坩埚中的钛。也可以使用高频电流来熔化钛。通过使用上述装置，可以获得尺寸精确并且不具有脆弱的金属氧化物或粗糙空腔的外部层的铸件。

12. 发明授权

US3977462A Apparatus for producing a die cast of a complicated shape 失效
标题翻译：用于生产复合形状的模具的装置
公开(公告)号：US3977462A
公开(公告)日：1976-08-31
申请号：US533155
申请日：1974-12-16
申请人： Isao Ohara
发明人： Isao Ohara
IPC分类号： B22D18/04 , A61C13/20 , B22D18/02 , B22D18/06 , B22D23/00 , F27D11/08 , B22D27/16
CPC分类号： F27D11/08 , B22D23/006
摘要： A molding arrangement to produce a die cast of a complicated shape by using an air-evacuated, air-tight work chamber. The chamber has a crucible and a mold, and an inert gas is used. An arc is generated and the electric resistance of the inert gas is broken between a pair of electrodes provided in the chamber by oscillating a high frequency current from a high frequency oscillator circuit connected outside the chamber. The metal material is melted in the crucible by the arc, while supplying the inert gas and using discharging gas generated from the metal. When the metal is melted the injection of inert gas into the chamber is stopped, so as to make the chamber a vacuum. The furnace, which includes the chamber, is rotated and the melt in the crucible is transferred into the mold. The melt is then forced to reach every corner in the mold by the pressure of the inert gas which is injected again into the chamber.

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