Describe the principle of die casting in layman's terms. In fact, the working principle of die casting is the same as that of injection molding, except that the injection molding is made of RESIN as raw material, while the die casting is made of liquid metal as raw material. Under the action of high pressure, it is filled into the mold cavity at a very fast speed in a very short time through the injection punch, and then solidified to produce castings.
Let's talk about the materials first. Taking aluminum alloy die castings as an example, there are three major standards that are basically universal in the world, China, Japan and the United States, China GB's ZL102 and ZL104, Japan's ADC10 and ADC 12, and the United States' A360 and A380. The material of aluminum alloy die castings is mainly aluminum ingots, and the price and market of aluminum ingots can be obtained through mainstream information websites, such as LME, Shanghai Nonferrous Metals, etc.
Let's talk about the process. Die casting alloys are mainly zinc alloys, aluminum alloys, magnesium alloys and other alloys. Die casting machines are divided into cold pressing and hot pressing, and the direction of die casting is divided into vertical and horizontal. When to choose which equipment will directly trigger the cost and quality. The conventional SOP of die casting is: spray-fixed mold-soaking-injection-cooling-opening mold-extrusion-blank. The key KPIs of the die casting process include pressure value, time point, temperature value, etc. Common problems of die castings include delamination, depression, lack of meat, cracks, burrs, flash, etc.
After die casting, it is still a blank, and we still need to do surface treatment. Because most aluminum alloy die castings are appearance parts, the purpose of surface treatment is to prevent corrosion. Surface treatment mainly includes electroplating and painting. And painting is divided into liquid paint spraying and powder spraying. Paint is mainly composed of curing agent and diluent.
Let's talk about die casting equipment. The main brands in the industry are Switzerland, Germany, Japan, Italy and China. For example, Switzerland's Buhler, Germany's Fulai, Japan's TOSHIBA, Italy's Perez, and China's Longhua. When looking at a die-casting factory, first look at the level of its equipment to help judge the quality standards and strength of the die-casting factory. Good equipment does not necessarily make good products, but bad equipment will definitely not make good products.
A brief discussion on the supply chain of die castings
2025-04-07
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