The process requirements for alumina die-casting technology are a complex issue that covers multiple aspects, including material properties, forming processes, surface treatment, and other aspects. This article will explore in detail the technical process requirements for alumina die-casting parts from the aspects of die-casting forming conditions, surface treatment technology, and special processes such as vacuum die-casting.

1、 Die casting forming conditions

Die casting is a key process in the production of alumina die-casting parts, and its quality directly determines the performance and application range of the product. The determination of injection pressure, locking force, and opening force of a die-casting machine, as well as the required injection ratio and injection speed based on the condition of the workpiece, are the basic parameters for die-casting molding. The setting of these parameters requires comprehensive consideration of the fluidity of the material, the structure of the mold, and the dimensional accuracy requirements of the product.

Mold temperature is one of the important factors affecting the quality of die-casting parts. The mold temperature is too high, and the internal structure of the casting is dense, but the casting is prone to "welding" and sticking to the mold cavity, making it difficult to remove the casting. Therefore, the mold temperature needs to be controlled within a certain range to ensure smooth demolding of the casting and stable internal quality.

Die casting technology is the comprehensive application of organic die casting machines, die casting alloys, and die casting molds, enabling stable, rhythmic, and efficient production of qualified castings with good internal quality and dimensions that meet the requirements of drawings or agreements, and even high-quality castings. During this process, it is necessary to strictly control the die-casting parameters, such as die-casting temperature, die-casting pressure, die-casting time, etc., to ensure the quality of the die-casting parts.

2、 Surface treatment technology

The surface treatment technology of alumina die-casting plays an important role in improving the corrosion resistance, wear resistance, and decorative properties of the product. Common surface treatment techniques include powder coating, baking paint, passivation treatment, anodizing, etc.

Powder coating is the process of spraying powder coating onto the surface of a die casting. Under the action of static electricity, the powder will uniformly adsorb onto the surface of the die casting, forming a powdery coating. After high-temperature baking, leveling and solidification, the powder coating becomes the final coating with different types of effects. Powder coating treatment has the advantages of high mechanical strength, good adhesion, corrosion resistance, aging resistance, and low cost.

The baking paint process involves phosphating aluminum alloy and spraying it, followed by baking. The resulting coating is not only corrosion-resistant but also bright and wear-resistant, and is not easily peeled off. Pre treatment of baking paint includes steps such as oil removal, water washing, rust removal, water washing, surface adjustment, water washing, phosphating, water washing, drying, etc., to ensure good adhesion between the coating and the substrate.

Passivation treatment is a chemical method that forms a dense oxide film on the surface of aluminum alloy die castings to improve their corrosion resistance. Anodizing is the process of placing aluminum parts into an electrolytic cell and casting them as anodes under electrical conditions, resulting in a dense layer of aluminum oxide film on the surface. Anodic oxide film has the characteristics of good protection, wear resistance, and various colors, such as natural color, sky blue, etc.

3、 Special Process - Vacuum Die Casting Method

Vacuum die casting is an advanced die casting process that eliminates or significantly reduces gas pores and dissolved gases in the die casting mold cavity during the die casting process, thereby improving the mechanical properties and surface quality of the die casting.

The vacuum die casting method has the following advantages: firstly, it can eliminate or reduce the pores inside the die casting, improve the mechanical properties and surface quality of the die casting, and enhance the plating performance; Secondly, it greatly reduces the back pressure of the mold cavity, allowing for the use of lower specific pressures and alloys with poor casting performance. It is possible to use small machines to cast larger castings; Thirdly, compared with ordinary die-casting methods, the production efficiency is almost the same, making it easy to promote in actual production.

The vacuum die-casting method has broad application prospects in the production of alumina die-casting parts. For example, AM60B magnesium alloy automotive wheels were produced using vacuum die casting on a cold chamber die casting machine, and AM60B magnesium alloy automotive steering wheels were produced using vacuum die casting on a hot chamber die casting machine with a clamping force of 2940kN. The successful production of these products proves the feasibility and superiority of vacuum die-casting method in the production of alumina die-casting parts.

4、 Other technical process requirements

In addition to the above die-casting molding conditions, surface treatment techniques, and special processes, the production of alumina die-casting parts also needs to pay attention to the following technical process requirements:

One is mold design and manufacturing. Mold is a key equipment in the production of die-casting parts, and its design and manufacturing quality directly affect the quality of die-casting parts. Therefore, it is necessary to design the mold structure reasonably and select suitable mold materials according to the requirements of product shape, size, accuracy, etc., to ensure the accuracy and service life of the mold.

The second is material selection and proportioning. The material selection for alumina die-casting parts should be determined based on the product's usage environment and performance requirements. At the same time, it is necessary to reasonably mix various raw materials to ensure uniform composition and stable performance of the die-casting parts.

The third is the heat treatment process. Heat treatment is one of the important means to improve the performance of alumina die-casting parts. Through a reasonable heat treatment process, residual stress in die castings can be eliminated, and the mechanical properties and corrosion resistance of materials can be improved.

The fourth is testing and quality control. In the production process of alumina die-casting parts, strict inspection and quality control are required for raw materials, molds, die-casting parts, etc. By adopting advanced detection technology and equipment, problems in production can be detected and solved in a timely manner, ensuring that the quality and performance of the product meet the design requirements.

In summary, the technical process requirements for alumina die-casting involve multiple aspects, including die-casting forming conditions, surface treatment techniques, special processes such as vacuum die-casting, and other technical process requirements. Only by strictly controlling the technical parameters and quality requirements of each link can high-quality alumina die-casting parts be produced to meet the needs of various application scenarios. At the same time, with the continuous advancement of technology and innovation of processes, the technical requirements for alumina die-casting parts will also be constantly updated and improved, providing strong technical support for product upgrading and market expansion.