TH34149B - Reduction casting method - Google Patents

Abstract

DC60 (06/06/46) Reduction casting method which includes the steps of pouring molten metal to the cavity of the mold for casting and casting operations while reducing the oxide film with Forms on the surface of the molten metal by allowing the molten metal and matter to be reduced. come into contact with the cavity. On this occasion, molten metal is poured into the cavity in a mold state. for castings to be well cooled by the cooling device by means of rapid cooling In addition, in this rhythm solidification speed, which allows the molten metal to cool rapidly will allow a value of 600 °C/min. In addition, at this time, the molten metal is filled into the cavity in filling times from 1.0 s to 9.0 s. which includes the steps of pouring molten metal to the cavity of the mold for casting and casting operations while reducing the oxide film with Forms on the surface of the molten metal by allowing the molten metal and matter to be reduced. come into contact with the cavity. On this occasion, molten metal is poured into the cavity in a mold state. for castings to be well cooled by the cooling device by means of rapid cooling In addition, in this rhythm solidification speed, which allows the molten metal to cool rapidly will allow a value of 600 °C/min. In addition, at this time, the molten metal is filled into the cavity in the filling time from 1.0 s to 9.0 s.

Claims (9)

All claims which will not appear on the advertisement page: 1. Reduction casting method, which involves pouring molten metal into a casting mold cavity. The mold is forcefully cooled by a cooling device, causing the molten metal to cool rapidly. Casting occurs while the oxide film forming on the molten metal surface is reduced by allowing the molten metal and reducing agent to come into contact within the cavity. The molten metal cools rapidly at a rate of 600°C/min or more, and the cavity is filled with the molten metal in a time ranging from 1.0 second to 9.0 seconds. 2. Reduction casting method as defined in Requisition 1, where the DASII value is permitted to be 22 µm or less, with a settling rate of molten metal of 600 °C/min or more. 3. Reduction casting method as defined in Claim 1, where the solidification rate is specified to be 800 °C/min or greater. 4. Reduction casting method as defined in Requisition 1, where the DASII value is permitted to be 20 µm or less, with a settling rate of molten metal of 800 °C/min or more. 5. The reduction casting method as defined in Claim 1, in which the molten metal pouring time is adjusted to a value between 1.0 seconds and 9.0 seconds, involves pouring the molten metal into the cavity while the molten metal is pressurized. 6. Reduction casting method as defined in Claim 1, where the reduction substance is magnesium. 7. The reduction casting method as defined in claim 1, whereby the reduction substance is a magnesium-nitrogen compound (Mg3N2). 8. The reduction casting method as defined in Claim 1, in which the cooling equipment provides cooling so that the casting mold is maintained at 150°C or less at the time of casting. 9. Reduction casting methods as defined in claim 1, in which the solidification rate is specified to be in the range of 600–2000 °C/min. 1. Reduction casting methods as defined in claim 1, which also include a purging step to create an oxygen-free atmosphere in the cavity. 1. Reduction casting methods as defined in claim 1, which also include a mixing agent to form a reducing agent in the cavity so that the reducing agent comes into contact with the inner wall surface of the cavity, which draws oxygen from the oxide film spread on the surface of the molten metal to reduce the surface area of the molten metal. 1. Reduction casting methods as defined in claim 1, which also include partial turbulent filling of the molten metal. 1. Reduction casting methods as defined in claim 1, which also include the application of pressure to force the molten metal into the cavity during the pouring step. 1. Reduction casting methods, which include the steps of... The pouring of molten metal into the cavity of a casting mold under pressure; the forced cooling of the molten metal during casting to maintain the mold temperature at a predetermined temperature and below the time of casting; the reduction of the oxide film formed on the surface of the molten metal by allowing the molten metal and the reducing agent to come into contact in the cavity; and the setting of the solidification rate at which the molten metal is rapidly cooled to approximately 600 °C/min or more; 1. A reduction casting method as defined in Claim 14 in which the molten metal fills the cavity in a filling time from 1.0 sec to 9.0 sec; 1. A reduction casting method as defined in Claim 15 where the solidification rate is set from 600 °C/min to 2000 °C/min. The filling time of the molten metal shall be between 9.0 seconds and 2.7 seconds and between 4.0 seconds and 1.2 seconds, and the predetermined temperature at the time of casting shall be 150 °C or less. 1. Reduction casting method as defined in claim 14 in which the reducing agent is mixed from the agent inside the cavity, the agent shall consist of the first reducing agent prepared in the cavity by using a carrier gas while controlling the pressure and flow of the carrier gas, and a second agent prepared to enter the cavity to react with the first reducing agent to form the reducing agent in the cavity and which is initially deposited on the surface of the inner walls of the cavity. 1. Reduction casting method as defined in claim 14 in which the reducing agent is obtained Introduced into the cavity after mixing of the reducing agent: 1. Reduction casting method as defined in claim 14, where at a curing rate of 600 °C/min or more, the space between the filled and cured dentrites in the cavity becomes 22 µm or less. 2. Reduction casting method as defined in claim 14, where at a curing rate of 800 °C/min or more, the space between the dentrites becomes 20 µm or less.