In addition to continuing to improve vacuum die-casting, it has also developed New technologies such as squeeze casting and semi-solid die-casting are introduced, and they are generally called "high-density die-casting method". In recent years, in order to solve the problems of pores and shrinkage holes in the die-casting parts, people can produce high-strength, high-density, weldable, heat-treatable, and twistable die-casting parts with various high requirements.
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Now the injection speed and pressure have been changed from the original manual handwheel adjustment control to computer control. Over the next 40 years, leading die-casting machine manufacturers around the world conducted research and experimentation on the injection process, and developed some new processes, such as the parabolic injection system in the 70s, the flashless die-casting system in the 80s, and the 90s The flashless injection system, some of which re-decompose each stage from the three-stage injection, which is an extension of the continuous development of this classic three-stage injection. In the middle of the 1960s, this three-stage injection has been generally pushed away, and the speed of the fast injection stage has been increased to 5m/s. This is the classic three-stage injection.
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Increase the density of die castings, at slow and fast speedsĪfter that, a pressure increase stage was added, which became three stages of slow injection, fast injection and pressurization. The injection process is simply broken down into two stages, slow and fast, but the fast speed is only 3m/s. It will soon be improved to two-stage injection. With this process, there are many pores inside the casting and the structure is loose. The die-casting process of the early horizontal cold-chamber die-casting machine has only one speed to push the molten metal into the mold, and the injection speed is only 1m~2m/s. Therefore, the development and research of new die-cast aluminum alloys has been going on. Therefore, it is difficult for general die-casting parts to undergo solution heat treatment, which restricts To improve the mechanical properties of die-cast aluminum alloys, although oxygen-filled die-casting and vacuum die-casting are effective ways to improve the mechanical properties of alloys, it is still difficult to use them widely. Due to the characteristics of high-pressure rapid solidification of die-casting, this contradiction is more prominent in some aspects. The improvement of the mechanical properties of die-cast aluminum alloys is often accompanied by the reduction of casting process performance. At present, the die-cast aluminum alloys used in industrial applications mainly include the following series: Al-Si, Al-Mg, Al-Si-Cu, Al-Si-Mg, Al-Si-Cu-Mg, Al-Zn, etc. Die-cast aluminum alloys can be divided into low- and medium-strength (such as China's Y102) and high-strength (such as China's Y112) according to their performance. Since die-cast aluminum alloy was put into commercial production in 1914, it has developed rapidly with the development of the automobile industry and the invention of the cold-chamber die-casting machine. With the improvement of technical level and product development capabilities, the types and application fields of die-casting products continue to expand, and its die-casting equipment, die-casting molds and die-casting processes have undergone tremendous changes. The types of die casting products in China are diversified, including automobiles, motorcycles, telecommunications, home appliances, hardware products, power tools, IT, lighting, escalator steps, toy lights, etc.
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Among them, aluminum alloy die-casting parts account for 3/ 4 and above. The output of die-casting parts has increased from 266,000 tons in 1995 to 870,000 tons in 2005, and the annual growth rate has remained above 20%. There are about 3,000 die-casting enterprises in China. At present, the aluminum alloy die-casting process has become one of the most widely used processes in the automotive aluminum alloy forming process, accounting for 49% of the various automotive forming process methods.
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Since the 1990s, China's die-casting industry has achieved amazing development and has developed into a new industry. Publish Time: 05/11 2021 Author: Site Editor Visit: 1777