Bidirectional confluence type high-quality semi-solid die-casting forming process

Abstract

According to the bidirectional confluence type high-quality semi-solid die-casting forming technology, a die-casting die is installed on a die-casting machine, the die comprises a product forming die cavity formed by correspondingly combining an upper die cavity and a lower die cavity, and the product forming die cavity is correspondingly provided with a side edge pouring inlet and an upper side pouring inlet formed in an upper die; metal raw materials are preheated and then subjected to electric heating melting, a grain refiner is added into liquid metal, stirring and heat preservation are conducted in a rotating permanent magnetic field, and semi-solid slurry is obtained; and a die-casting die is preheated and heated, the semi-solid slurry is injected into the forming die cavity from the side pouring inlet and the upper side pouring inlet at the same time, and die casting is conducted. According to the invention, the semi-solid slurry is injected into the mold in a bidirectional confluence manner, and under the condition of adjusting the specific process parameters of the semi-solid slurry and the mold, not only is the semi-solid forming efficiency improved, but also the cavity at the fine local part can be filled and tamped, and the forming quality is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of semi-solid die casting, and in particular relates to a bidirectional converging high-quality semi-solid die casting process. Background Art

[0002] Semi-solid die casting is a net forming process that forces semi-solid slurry to fill and solidify under pressure under the joint action of the squeeze casting mold and the injection punch. It combines the dual advantages of semi-solid forming and squeeze casting and has received widespread attention. In the implementation process of semi-solid die casting, at present, a large opening-shaped pouring port is set on the side of the corresponding mold combination, and the die casting punching is completed by vacuuming the corresponding mold. However, due to the viscosity of the fluid in semi-solid die casting, this punching time is relatively long, which affects the product preparation time, and there is a problem of insufficient filling in the cavity filling of relatively fine parts such as the bottom protruding feet, which affects the product quality. Therefore, it is necessary to provide a two-way converging high-quality semi-solid die casting molding method to solve the above problems. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies of the prior art, an object of the present invention is to provide a bidirectional converging high-quality semi-solid die-casting process.

[0004] The present invention is achieved by a bidirectional converging high-quality semi-solid die-casting process, which comprises the following steps:

[0005] (1) installing a die-casting mold on a die-casting machine, wherein the mold includes a product forming cavity formed by a corresponding combination of an upper cavity and a lower cavity, and the product forming cavity is correspondingly provided with a side pouring inlet and an upper pouring inlet opened in the upper mold;

[0006] (2) preheating the metal raw material and then melting it by electric heating, adding a grain refiner to the liquid metal, stirring and keeping it warm in a rotating permanent magnetic field to obtain a semi-solid slurry;

[0007] (3) The die-casting mold is preheated and the semi-solid slurry is injected into the molding cavity through the side pouring inlet and the upper pouring inlet simultaneously for die-casting.

[0008] Preferably, in step (2), the preheating temperature of the metal raw material is 90-110°C.

[0009] Preferably, in step (2), the grain refiner is selected from Al-Ti-B grain refiner.

[0010] Preferably, in step (2), the insulation time is 20 to 30 minutes, and the insulation temperature is 205±2°C.

[0011] Preferably, in step (3), the mold is evacuated during die casting.

[0012] Preferably, in step (3), the preheating temperature of the die-casting mold is 160±2°C.

[0013] Preferably, in step (3), the die-casting molding pressure is 100 to 800 KN, and the holding time is set to 10 to 15 s.

[0014] Compared with the shortcomings and deficiencies of the prior art, the present invention has the following beneficial effects: the present invention injects semi-solid slurry into the mold in a bidirectional confluence manner, and by adjusting the specific process parameters of the semi-solid slurry and the mold, not only the semi-solid molding efficiency is improved, but also the cavities in fine local areas can be filled, thereby ensuring the molding quality. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] The embodiment of the present invention discloses a bidirectional converging high-quality semi-solid die-casting process, which comprises the following steps:

[0017] (1) Installing a die-casting mold (a bidirectional converging high-quality semi-solid die-casting molding structure disclosed in CN116550949A) on a die-casting machine, wherein the mold includes a product molding cavity formed by a corresponding combination of an upper mold cavity and a lower mold cavity, and the product molding cavity is correspondingly provided with a side pouring inlet and an upper pouring inlet opened on the upper mold;

[0018] (2) preheating the metal raw material (aluminum liquid) to 100° C. and then melting it by electric heating, adding Al-Ti-B grain refiner to the liquid metal, stirring it in a rotating permanent magnetic field, and keeping it at 205±2° C. for 30 minutes to obtain a semi-solid slurry;

[0019] (3) The die-casting mold is preheated to 160±2° C. The semi-solid slurry is injected into the molding cavity through the side pouring inlet and the upper pouring inlet simultaneously and die-casted. The pressure is 500 KN and the holding time is set to 15 s. The mold is vacuumed during the die-casting.

[0020] After the product is formed, the die-casting machine opens the mold and inspects the die-cast product. The product structure is complete, and the structure of the cavity in the corresponding micro-local area is filled and solid. The casting efficiency is 2 to 3 times that of the existing semi-solid die-casting process.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bidirectional converging high-quality semi-solid die-casting process, characterized in that: The process includes the following steps: (1) installing a die-casting mold on a die-casting machine, wherein the mold includes a product forming cavity formed by a corresponding combination of an upper cavity and a lower cavity, and the product forming cavity is correspondingly provided with a side pouring inlet and an upper pouring inlet opened in the upper mold; (2) preheating the metal raw material and then melting it by electric heating, adding a grain refiner to the liquid metal, stirring and keeping it warm in a rotating permanent magnetic field to obtain a semi-solid slurry; (3) The die-casting mold is preheated and the semi-solid slurry is injected into the molding cavity through the side pouring inlet and the upper pouring inlet simultaneously for die-casting.

2. The process according to claim 1, characterized in that In step (2), the preheating temperature of the metal raw material is 90-110°C.

3. The process according to claim 1, characterized in that In step (2), the grain refiner is selected from Al-Ti-B grain refiner.

4. The process according to claim 1, characterized in that In step (2), the insulation time is 20 to 30 minutes, and the insulation temperature is 205±2°C.

5. The process according to claim 1, characterized in that In step (3), the mold is evacuated during die casting.

6. The process according to claim 1, characterized in that In step (3), the preheating temperature of the die-casting mold is 160±2°C.

7. The process according to claim 1, characterized in that In step (3), the die-casting molding pressure is 100 to 800 KN, and the holding time is set to 10 to 15 s.