Metal mold extrusion imbedding method
By using the metal mold extrusion casting method and employing heating of the insert assembly and closed extrusion technology, the problems of poor fluidity between the insert and molten steel and difficulty in metallurgical bonding in gravity casting were solved, achieving complete mold filling and metallurgical bonding for a large proportion of inserts.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-29
- Publication Date
- 2026-04-14
AI Technical Summary
Gravity casting is difficult to use for inserts that make up more than 50% of the total volume, and it suffers from problems such as poor fluidity between the insert and the molten steel, difficulty in filling the mold, and difficulty in metallurgical bonding.
The metal mold extrusion casting method is adopted. After the insert assembly is heated to 600℃~1000℃, it is placed into the metal mold, the mold is closed and locked, and the press is started to perform closed extrusion, so that the molten steel enters the small gaps between the inserts and forms a metallurgical bond.
It achieves complete filling and metallurgical integration of large-scale inserts with molten steel, solving the problems of gravity casting methods.
Abstract
Description
Technical Field
[0001] A metal mold extrusion casting method relates to the field of material forming and control engineering technology. Background Technology
[0002] It is very difficult to insert castings with an insert volume ratio greater than 50% of the total casting volume using gravity casting. The mechanism is as follows: 1. Due to the large volume ratio of the insert, that is, the large heat melting of the insert, the insert cools the molten steel entering between the inserts at a high rate, reducing the fluidity of the molten steel, i.e., the filling capacity, and the molten steel cannot completely fill the gaps between the inserts; 2. The geometric size of the gaps between the inserts is small, the fluidity of the molten steel is limited, it is difficult to completely fill the mold, and the insert cannot form a metallurgical bond with the molten steel.
[0003] This invention discloses a metal mold extrusion casting method specifically designed for casting large-scale inserts where gravity casting methods are ineffective. The large-scale inserts refer to inserts whose total volume accounts for more than 50% of the casting's insert layer volume. The inserts are designed to be fixed within a thin-walled steel plate mold, possessing the shape of a casting and an open top to prevent direct contact between the molten steel and the mold. The purpose of this insert assembly design is to both fix all inserts and allow the entire assembly to be heated in a furnace and then placed into the metal mold. After heating the insert assembly to 600℃~1000℃, it is placed in the metal mold, the mold is closed and locked, and the press is started. The upper mold performs a closed-loop extrusion of the molten steel, allowing it to enter the small gaps between the inserts, completely filling the mold and wetting the insert surface under pressure to form a metallurgical bond. Summary of the Invention
[0004] This invention discloses a metal mold extrusion casting method specifically designed for casting large-scale inserts where gravity casting methods are ineffective. The large-scale inserts refer to inserts whose total volume accounts for more than 50% of the casting's insert layer volume. The inserts are designed to be fixed within a thin-walled steel plate, possessing the shape of a casting, open at the top, and used to prevent direct contact between molten steel and the metal mold. This constitutes an insert assembly. The purpose of the insert assembly design is to both fix all inserts and allow the entire assembly to be heated in a furnace and then placed into the metal mold. The thin steel plate prevents molten steel from adhering to the metal mold. After the insert assembly is heated to 600℃~1000℃, it is placed into the metal mold, the mold is closed and locked, and the press is started. The upper mold performs a closed-loop extrusion of the molten steel, allowing it to enter the small gaps between the inserts, completely filling the mold, and wetting the insert surface under pressure to form a metallurgical bond.
[0005] To ensure a complete metallurgical bond between the insert and the molten steel, the insert assembly is heated to 600℃~1000℃ and then immersed in copper brazing solution, so that a layer of copper brazing solution is fused onto the surface of the insert assembly. Specific implementation methods
[0006] Metal mold preparation: including the lower metal mold and the upper extrusion mold.
[0007] Insert assembly preparation: The insert assembly is manufactured, heated, and placed into a metal mold.
[0008] Quantitative casting: After closing and locking the mold, molten steel is poured in a fixed quantity.
[0009] Extrusion casting: Start the press, the upper mold forms a closed extrusion of molten steel, hold the pressure for a certain time, demold, and obtain the metal mold extrusion casting.
Claims
1. A metal mold extrusion casting method, characterized in that: it is specifically designed for casting large-scale inserts that cannot be cast by gravity casting; the inserts are all fixed according to design to form an insert assembly, which is made of thin steel plate, can be placed in a metal mold, has the shape of a casting, has an open top, and is used to prevent molten steel from directly contacting the metal mold. The function of the insert assembly is that the insert assembly can be heated to a certain temperature as a whole and then placed in the metal mold, and its thin steel plate can prevent molten steel from sticking to the metal mold; after the insert assembly is heated to a certain temperature and placed in the metal mold, the mold is closed and locked, molten metal is poured in a metered amount, the press is started, and the upper mold performs closed extrusion on the molten steel. Under pressure, the molten steel enters the small gaps between the inserts and wets the surface of the inserts under pressure to form a metallurgical bond.
2. According to claim 1, the insert assembly is preheated to 600℃~1000℃ to improve the fluidity of the molten steel and facilitate metallurgical bonding with the insert.
3. After the insert assembly is preheated to 800°C, it is immersed in copper brazing liquid to coat the surface of the insert assembly with a layer of copper brazing liquid, ensuring that the molten steel completely wets the insert assembly to form a complete metallurgical bond.