Chilling disc for cooling, orienting and solidifying liquid metal

[0014] Example

[0015] A chilling plate for liquid metal cooling and directional solidification, comprising a chilling plate body 1, characterized in that the chilling plate body 1 has an annular channel 13 for the passage of a liquid medium or a petal-shaped channel 12 for the passage of the liquid medium. 1Made of stainless steel or heat-resistant steel.

[0016] The principle of use of the liquid metal cooling directional solidification chill plate of the present invention:

[0017] The chilled plate body 1 is fixed on a ceramic mold or mold assembly 5 with an open bottom as the bottom of the mold to prevent the mold from leaking. The most important thing is that the chilled plate body 1 can be cooled by a liquid medium heat-conducting oil. The liquid medium heat-conducting oil enters the chilled plate body 1 in the A direction through the inner hollow drawing shaft 2 and flows out in the B direction. During the directional solidification process, the heating and holding furnace 3 heater 4 (arranged above the annular partition 6) and heater 7 (arranged below the annular partition 6) preheated mold 5 received from the induction melting furnace (Figure The superalloy melt poured into the cavity by the traditional method in (not shown in), because the liquid medium in the chilling plate quickly takes away the heat transferred from the superalloy melt to the chilling plate, and the superalloy melt in contact with the chilling plate The body solidifies instantly, which promotes the competitive growth of nucleation and grains. Subsequently, the mold and the chill plate are driven by the pulling shaft 2 to slowly enter the liquid cooling medium tin 9 from the hole of the heat insulation baffle 8 at a certain speed. The liquid cooling medium tin is contained in the stainless steel container 10 and can be Driven by the lifting shaft 11, it moves up and down. Under the common cooling action of the chill plate and the liquid tin, the crystal grains grow upward in the axial direction until the entire casting is solidified. The known process method is to put the casting mold drawn from the heating and holding furnace at a high temperature (above 1500℃) and directly immerse it in the tin liquid, causing the temperature of the tin liquid to increase locally, although the stirring of the tin liquid has a certain cooling effect However, it takes a long time to reach the temperature equilibrium, and with the continuous immersion of the mold, more heat enters the tin, causing a local temperature rise of the tin liquid, resulting in a decrease in the temperature gradient at the solidification front of the solid-liquid interface, causing casting defects. The liquid medium in the chill plate can quickly take away the heat in the tin around the mold, maintain the uniformity of the tin liquid temperature near the mold, and facilitate the stable growth of crystals.