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jdiecastingchina Junying
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The multiple alloys which are formed by adding other alloying elements to ordinary brass are called special brass. The common added alloying elements are lead, tin, aluminum, etc., and the multiple alloys can be called lead brass, tin brass and aluminum brass. The purpose of adding alloying elements is to improve tensile strength and manufacturability.
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Brass which is made of copper and zinc is called ordinary brass. A variety of alloys which is made of two or more elements is called special brass. For example, copper alloys are made of lead, tin, manganese, nickel, iron and silicon.
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Overflow boxes and discharge passages with enough overflowing areas should be set up for molds, which is very important to ensure quality of die casts. People often overlook the problem of molten metal blocking the overflow passages too early. Reasonable structures should be adopted to make molten metal firstly flow into the deeper parts of overflow boxes, ensuring discharge vents not being blocked for the longest time. In addition, ejector rods should be set up for overflow boxes to remove the metals in overflow boxes.
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Electropolishing processes have high efficiency and the metal part which is processed by the electropolishing process has good quality. High gloss can be obtained by the electropolishing process within a few minutes. Pressure regulators, rectifiers, electrolytic tanks and other devices are required for the electropolishing process.
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According to statistics, 60 to 70 percent of steel are plates among the world's steel, and most of plates are processed by stamping. Therefore, stamping has inherent advantages. Machining has low processing efficiency, and it is difficult to process parts with complex structures. However, machining is widely used for processing phones. What are the reasons? Stamping and machining are widely applied to metal parts of phones, and what are advantages and disadvantages of stamping and machining processes? We are going to analyse the reasons in this article.
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Inclusions are particles, whose composition is different from that of the casting, formed on the surfaces of the die casting part or inside the casting due to the coating materials, molding materials and refractory materials getting into the alloy melt.
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First, the surfaces of the hole wall are relatively smooth with metallic luster. Second, blowholes are existing under the surfaces of the die casting parts individually or in groups. Third, the blowholes of lampblack are oil color.
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In recent years, economic and market benefits which are brought by the rapid development of the Chinese zinc alloy die casting technology can not be underestimated. According to experts, the main characteristics of zinc alloy die casting technology are as the following.
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The real baking finish uses phosphatized aluminum alloy to paint the workpiece, and then bake the painted workpiece. This kind of coating not only has corrosion resistance, but also has bright colors and wear resistance. It is not easy to peel off.
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In 1990, Honda launched the NSX sports car which was the world's first vehicle model with the whole aluminum body, and it was mass-produced. Honda produced 18,000 sports cars during the fifteen years. The car with the whole aluminum body which was mass-produced and well known to people was the Audi A8. The birth of the Audi A8 followed the Audi Space Frame Technology which was launched by Audi in 1993.
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