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1. 发明授权

US07987897B2 Method for making castings by directed solidification from a selected point of melt toward casting periphery 失效
标题翻译：通过从熔体的选定点朝向铸造周边的定向凝固来制造铸件的方法
公开(公告)号：US07987897B2
公开(公告)日：2011-08-02
申请号：US12380357
申请日：2009-02-26
申请人： Oleg Vladimirovich Anisimov , Yury Valeryevich Shtankin
发明人： Oleg Vladimirovich Anisimov , Yury Valeryevich Shtankin
IPC分类号： B22D27/08 , B22D27/04 , C22F3/02
CPC分类号： B22D27/045
摘要： The invention is related to the foundry practice. According to this invention, the method for making castings by directed solidification from a selected point of the melt toward the periphery of the casting comprises forming a casting in a mold having thermodynamic characteristics that allow uniform volume cooling of the melt to be effected to a temperature at which natural solidification processes are completed. To improve the structural isotropy of the casting formed, the cooling is effected at a rate not exceeding 0.5° C./sec. The casting is formed in a nonuniform field of force. The nonuniform field of force is set up by ultrasonic waves focused on a selected point of the melt to form therein a localized elevated pressure zone and to direct the solidification front from the zone toward the periphery of the casting. The nonuniform field of force is sustained in the mold until the cooling casting reaches a temperature at which the natural melt solidification processes are completed as the melt cools. Before the melt is poured into the mold, it is overheated to a level that, together with the thermodynamic characteristics of the mold allowing the melt therein to be cooled at a rate not exceeding 0.5 K/sec, sustains the liquid phase of the melt for a time sufficient for directed melt solidification to be effected from the selected point of the melt toward the periphery of the casting before the commencement of natural melt solidification processes as the melt cools. Subsequently, as the temperature at which natural solidification processes are completed is reached, the nonuniform field of force is removed, and casting cooling may continue at any reasonable rate.
摘要翻译：本发明涉及铸造实践。根据本发明，通过从熔体的选定点朝向铸件的周边通过定向固化制造铸件的方法包括在具有热力学特性的模具中形成铸件，其允许使熔体均匀地体积冷却至温度自然凝固过程完成。为了改善所形成的铸件的结构各向同性，以不超过0.5℃/秒的速度进行冷却。铸造形成为不均匀的力场。通过聚焦在熔体的选定点上的超声波来建立不均匀的力场，以在其中形成局部升高的压力区，并将固化前沿从该区域引向铸件的周边。在模具中维持不均匀的力场，直到冷却铸件达到当熔体冷却时天然熔体固化过程完成的温度。在将熔体注入模具之前，将其过热至与允许其中的熔体以不超过0.5K /秒的速率冷却的模具的热力学特性一起，将熔体的液相维持在在熔体冷却之前自然熔融固化过程开始之前，从熔体的选定点向铸件的周边施加足以进行定向熔融固化的时间。随后，当完成自然凝固过程的温度时，除去不均匀的力场，并以任何合理的速度继续铸造冷却。

2. 发明申请

US20090242166A1 Method for making castings by directed solidification from a selected point of melt toward casting periphery 失效
标题翻译：通过从熔体的选定点朝向铸造周边的定向凝固来制造铸件的方法
公开(公告)号：US20090242166A1
公开(公告)日：2009-10-01
申请号：US12380357
申请日：2009-02-26
申请人： Oleg Vladimirovich Anisimov , Yury Valeryevich Shtankin
发明人： Oleg Vladimirovich Anisimov , Yury Valeryevich Shtankin
IPC分类号： B22D27/04 , B22D27/08
CPC分类号： B22D27/045
摘要： The invention is related to the foundry practice. According to this invention, the method for making castings by directed solidification from a selected point of the melt toward the periphery of the casting comprises forming a casting in a mold having thermodynamic characteristics that allow uniform volume cooling of the melt to be effected to a temperature at which natural solidification processes are completed. To improve the structural isotropy of the casting formed, the cooling is effected at a rate not exceeding 0.5° C./sec. The casting is formed in a nonuniform field of force. The nonuniform field of force is set up by ultrasonic waves focused on a selected point of the melt to form therein a localized elevated pressure zone and to direct the solidification front from the zone toward the periphery of the casting. The nonuniform field of force is sustained in the mold until the cooling casting reaches a temperature at which the natural melt solidification processes are completed as the melt cools. Before the melt is poured into the mold, it is overheated to a level that, together with the thermodynamic characteristics of the mold allowing the melt therein to be cooled at a rate not exceeding 0.5 K/sec, sustains the liquid phase of the melt for a time sufficient for directed melt solidification to be effected from the selected point of the melt toward the periphery of the casting before the commencement of natural melt solidification processes as the melt cools. Subsequently, as the temperature at which natural solidification processes are completed is reached, the nonuniform field of force is removed, and casting cooling may continue at any reasonable rate.
摘要翻译：本发明涉及铸造实践。根据本发明，通过从熔体的选定点朝向铸件的周边通过定向固化制造铸件的方法包括在具有热力学特性的模具中形成铸件，其允许使熔体均匀地体积冷却至温度自然凝固过程完成。为了改善所形成的铸件的结构各向同性，以不超过0.5℃/秒的速度进行冷却。铸造形成为不均匀的力场。通过聚焦在熔体的选定点上的超声波来建立不均匀的力场，以在其中形成局部升高的压力区，并将固化前沿从该区域引向铸件的周边。在模具中维持不均匀的力场，直到冷却铸件达到当熔体冷却时天然熔体固化过程完成的温度。在将熔体注入模具之前，将其过热至与允许其中的熔体以不超过0.5K /秒的速率冷却的模具的热力学特性一起，将熔体的液相维持在在熔体冷却之前自然熔融固化过程开始之前，从熔体的选定点向铸件的周边施加足以进行定向熔融固化的时间。随后，当完成自然凝固过程的温度时，除去不均匀的力场，并以任何合理的速度继续铸造冷却。

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