How to Make Zinc Alloy Die Cast Mould

Die-Casting Mold Making for Zinc Alloy Die-Cast Parts

Zinc alloy die-casting molds are essential process equipment that ensures the quality of die-cast parts. They work in coordination with die-casting equipment and die-casting process parameters to complete the die-casting forming process. The die-casting mold directly affects the shape, size, precision, surface, and quality of the die-cast parts. The smoothness of the die-casting production process and the guarantee of die-cast part quality largely depend on the reasonable structure and advanced technology of the die-casting mold, as well as the manufacturing quality of the mold.

Characteristics of Zinc Alloy Die-Cast Parts

Through multi-slider die-casting technology and techniques, Yixin specializes in micro, small to medium-sized, and complex-structured precision zinc alloy die-cast parts:

(1) Quality of zinc alloy die-cast parts:

1. High dimensional accuracy of cast parts, up to +/-0.02mm;

2. Good surface finish, with surface roughness reaching Ra0.8~3.2um, and sometimes even Ra0.4um;

3. Dense structure with high strength and hardness: Since the liquid metal cools and solidifies under pressure, with a very short filling time and rapid cooling speed, the metal grains near the surface of the die-cast parts are finer and have a dense structure. This not only gives the cast part a good wear and corrosion resistance but also enhances the overall hardness of the cast part—tensile strength of die-cast parts is generally 25~30% higher than sand casting, though elongation is somewhat reduced;

4. Stable dimensions and good interchangeability;

5. Ability to manufacture complex-shaped, well-contoured, and deep cavity metal parts: Because molten metal maintains high fluidity under high pressure and speed. Thus, it achieves metal parts that are difficult to process by other methods. For example, the current minimum wall thickness for zinc alloy die-cast parts can reach 0.3mm; aluminum alloy cast parts can reach 0.5mm; the minimum cast hole diameter is 0.7mm; and the minimum thread pitch is 0.75mm.

(2) For zinc alloy die-casting: 

High quality, fast speed, and burr-free zinc alloy die-casting is what customers pursue. Yixin is equipped with over 20 die-casting machines of various tonnages, including 15 multi-slider die-casting machines and other zinc and aluminum alloy die-casting machines, complemented by robotic arms to achieve high production efficiency:

1. High machine productivity, multi-slider die-casting improves processing speed by 5~10 times compared to traditional die-casting;

2. Long die-casting mold life, a die-casting mold for aluminum alloys can generally last for 1 million~1.5 million cycles;

3. Easy to achieve mechanization and automation.

(3) Excellent economic benefits:

1. High material utilization rate: Due to the high dimensional accuracy and low surface roughness of die-cast parts, they generally require no further machining and can be directly assembled or need very minimal machining for assembly. This not only enhances metal utilization but also reduces a significant amount of machinery and man-hours. The material utilization rate is about 60%~80%, and the blank utilization rate is about 90%.

2. The price of die-cast parts is relatively low;

3. Other materials' parts can be directly embedded in zinc alloy die-cast parts to save precious materials and machining time: This not only meets usage requirements and expands product applications but also reduces assembly workload, simplifying the manufacturing process.