Die-cast zinc alloy is the material of die-casting parts. To obtain excellent die-casting parts, in addition to having a reasonably designed part structure and shape, a complete die-casting mold, an accurate die-casting process plan and a die-casting machine with excellent process performance, you also need to have Die-cast zinc alloy material with excellent performance.

Characteristics of die-cast zinc alloy:

Zinc alloy has the characteristics of small crystallization temperature range, low melting point, easy filling and forming, not easy to produce looseness and sticky film, and can extend the life of the die-casting mold. Zinc alloy has good mechanical properties and can be used to die-cast various complex, thin-walled castings. The castings can be subjected to various surface treatments, have good electroplating properties, and have good room temperature performance.

After the zinc alloy is die-cast into a casting, it will shrink in size, and the alloy composition has a greater impact on the dimensional changes. The size of zinc alloy die-castings without copper is relatively stable, half zinc

After zinc alloy is die-cast into a casting, it will shrink in size, and the alloy composition has a greater impact on the size change. The size of zinc alloy die-casting parts that do not contain copper is relatively stable, and the size of general zinc-aluminum alloy die-casting parts does not change much. . The working range of zinc alloy is narrow. When the temperature is below 0°C, its impact toughness decreases sharply, and when the temperature exceeds 100°C, the mechanical properties decrease significantly. Zinc alloys are prone to aging, and the aging phenomenon is manifested by increased volume, reduced strength, and reduced plasticity. This is mainly due to the small solubility of impurities such as lead, tin, and cadmium in zinc alloys. Therefore, the impurity content should be strictly controlled during material selection and smelting.

Applications of die-cast zinc alloy:

Zinc alloy die-cast products have excellent surface quality and are currently widely used in the manufacture of toys, tableware, locks, decorative hardware, electrical and electronic castings, bathroom accessories, auto parts, zippers, metal buckles, watch cases, and fans. , daily necessities, household appliances, photographic equipment, audio, mechanical and electrical products and parts.

Control of the amount of zinc alloy zinc slag:

Try to avoid stirring the zinc alloy liquid in the zinc pot as much as possible. Stirring in any way will cause more zinc alloy liquid to come into contact with oxygen atoms in the air, thus forming more zinc slag.

Don’t scrape too frequently. When molten zinc alloys are exposed to air, they oxidize and form zinc slag. Keeping a thin layer of scum on the surface of the pot will help protect the liquid in the pot from further oxidation.

When scraping the slag, use a disk-shaped slag scraper with one more hole (about 6mm in diameter) to gently scrape under the scum to avoid stirring the alloy liquid as much as possible. Pick up the scraped slag and scrape it on the side of the zinc pot. Knock gently to make the molten metal flow back into the zinc pot.

The main parameters in the die-casting process involve pressure, speed, temperature and time. These parameters influence and restrict each other. The process of filling the cavity with molten metal during die-casting is to dynamically balance process factors such as pressure, speed, temperature and time. In the process, adjusting a parameter will cause changes in the corresponding process parameters. Therefore, it is very important to correctly select each process parameter. Careful selection of die-casting coatings and reasonable spraying operations are an important factor in ensuring the quality of die-casting parts and increasing the life of die-casting molds.