The quality requirements of bending type metal stamping parts

    Metal stamping parts is very widely used product in our daily life. With the development of science and technology, people more and more high request of hardware stamping parts. Especially in terms of quality and technology requirements are very high.
    The bending type metal stamping parts requirements:
    Bending shape should be symmetrical, the bending radius of not less than the allowable minimum bending radius.
    If parts have hole, to avoid hole deformation when bending.
    Curved edge is too short not easy forming, then the straight part of the bending edge H>2δ. If the requirements of H is very short, the need to set aside appropriate allowance to increase H, cut away the excess metal after bending.
    Metal stamping parts quality requirements are very strict, so the metal stamping parts supplier must strictly control the shape and size of stamping parts.

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The development prospects of the automotive die casting parts manufacturer

    The application of die casting in the automotive industry is keeping pace with the times. In die casting market, automotive die casting share significant. Therefore, the development prospects of the automotive die casting parts manufacturer are also very impressive.
    According to the relevant statistics: the industrial structure of different countries, the auto industry's share is not the same, but the proportion of automobile castings is among the best in the die casting industry. Since the end of the 20th century to the beginning of the 21st century, the proportion of the automotive die casting is 48~80% in the total amount of die casting. For example: Australia accounted for 80%, Japan accounted for 79%, Spain 65%, Chinese 64.5% ( containing cars and motorcycles), Germany 61%, India 60%, Canada 49%, USA 48% etc.. According to recent reports, this proportion has risen to around 75% in America.
    Auto parts casting have such great share in the die casting industry, so the automotive die casting has the very important status for die casting parts manufacturer. As for China, in recent years the ratio remained at 65 ~ 75% (including automobile, motorcycle and other vehicles), in terms of the auto parts, this proportion increases year by year.

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What are the zamak die casting material types

Commonly used zamak die casting material types:
    Zamak 3: good fluidity and mechanical properties. Applied to the requirements on the mechanical strength is not high castings, such as toys, lighting, decoration, electronic component.
     Zamak 5: good mobility and good mechanical properties. Applied to the mechanical strength has certain requirements of the castings, such as auto parts, electrical accessories, machinery parts, electrical components.
    Zamak 2: used to have special requirements, high mechanical performance requirements, the precision requirement of mechanical parts on the hardness.
    ZA8: good liquidity and size stability, but poor liquidity. The workpiece is applied to the casting of small size, high precision and mechanical strength requirements, such as electrical parts.
    Superloy: this zamak die casting material mobility is the best, applied to the workpiece casting thin wall, large size, high precision, complex shape, such as electrical components and the box body. Zinc alloy with different physical and mechanical characteristics of different, so choose the space provided for die casting design.

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The casting properties of die casting magnesium alloy

    The change of phase diagrams of die casting magnesium alloy in the high-speed cooling condition:
    In the casting conditions, due to high velocity, metal type strong cooling capacity, cooling speed is very quick. In the binary diagram, the eutectic point moves to the direction of heat stable component. As for Al alloy, it is moved to Si increase; as for Mg alloy, it is the move to Mg increasing, this movement can make the part Al hypoeutectic alloy become solid solution liquid single-phase alloy, part Al hypereutectic alloy become hypoeutectic alloy.
    Mg alloy is just the opposite, partial solid solution alloy become hypoeutectic alloy, part of hypoeutectic alloy becomes the hypereutectic alloy. In general, high cooling rate increase the content of Mg eutectic, conducive to the casting. In addition, compare the difference between the pure magnesium and aluminum melting point and eutectic temperature can also show that magnesium die casting is easy to casting, its value is 212 °C, and aluminum is 73 °C.

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The basic situation of China die casting manufacturer

     China die casting manufacturer are numerous, and there are a lot of die casting die professional manufacturing factory. Domestic needs die casting mainly comes from this kind of professional manufacturers. Which is part of the original state-owned enterprises or state-owned enterprises through reorganization and restructuring of enterprises, the other part is in recent years the rapid development of private enterprises.
     The general state-owned enterprises mold manufacturing long history, rich manufacturing experience, well-equipped, strong technical force, a comprehensive technology leader, they mould level can reflect the comprehensive level of our country current of die casting mould. But some enterprises affected by the long-term influence of the system, management method is not flexible, the productivity is not high, sometimes longer delivery cycles.
     The number of private professional mold die casting manufacturer is numerous, widely distributed in all parts of the country and especially in coastal areas, development is rapid, the total output is large, has become a major force in die production. They are flexible mechanism, with a short delivery, low prices to meet market demand. In recent years, many technical enterprise equipment level and management level have a great progress, but also received strong support from the local government and Mold Association, the introduction of numerical control equipment, CAD / CAM software, and even CAE software, mold manufacturing quality is improved rapidly, which part of the business does bigger more, the scale is not small, the output value is high, showing great vitality.

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What are the alloy elements in zinc die casting parts

The chemical composition of the zinc die casting parts:
     1) Aluminum (Al). Die-cast zinc alloy, typically containing 3.9-4.3% aluminum. Aluminum can improve the strength of the casting, but the casting strength is best when aluminum content is only 3.5% and 7.5%. And aluminum can affect the liquidity of the zinc alloy. Zinc alloy liquidity is best when aluminum content is 0% and 5%. The aluminum content has some influence on the zinc alloy casting, so the control of aluminum content is strictly.
     2) Magnesium (Mg). Zinc alloy impurities can lead to intergranular corrosion, traces of magnesium can reduce intergranular corrosion. Too much magnesium content increases the brittleness of the zinc alloy die casting. In production, magnesium is very easy to loss, so the more the number of recycling, magnesium content will be lower.
     3) copper (Cu). The effect of copper is similar to magnesium in the zinc alloy, can reduce intergranular corrosion, while increasing the strength of the zinc alloy, but the content exceeds a predetermined range, the dimensional stability of the casting is reduced, because the melting point of copper is higher, the copper content should be controlled in production.
     4) iron (Fe). Zinc alloy of iron with aluminum easily generate reaction FeAl3. It is lighter than zinc, can be cleared. Does not affect the mechanical properties and casting properties of castings, but the hard compounds can affect the polishing and machining tool.

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The development history of aluminum die casting

     The development history of aluminum die casting is public opinions are divergent. According to the relevant articles, initially there is a lead die casting. In 1822, Willam Church made casting machine daily production 1.2~2 million of the type. In the twenty years later, J.J.Sturgiss is designed and created the first piston operated hot chamber die casting machine, and obtained a patent in American. In 1885, Merck Gense Le study the previous patent, invention of printing die casting machine. In nineteenth Century 60 time for zinc alloy die-casting parts production. Die casting is widely used in industrial production is just at the beginning of the last century. In 1905 the H.H.Doehler developed for the industrial production of die casting machine, die cast zinc, tin, copper alloy castings. Then Wagner designed gooseneck pressure die casting machine for the production of aluminum die casting.

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Application of magnesium alloy die casting

    Application of magnesium alloy die casting is very extensive, commonly used materials are the following.
    AZ91D magnesium alloy is the most common, with excellent corrosion resistance, castability and good strength, mainly used in automobile, computer parts and sports equipment, shell, cover, chain, saw, hand tools, household electrical appliances.
    AM50, AM60 alloy possesses excellent toughness and energy absorption, strength and mechanical properties with both good, mainly for the car (seat bracket), steering wheel, instrument panel etc..
    AS41 and AE42 alloy has good creep resistance at 150 degrees Celsius, applied to the high temperature of the occasion, such as steam cylinder, crankshaft box, brake parts.

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Application of light alloy die casting

    As everyone knows, light alloy material has many advantages, especially with the automotive lightweight development trend, their density is small, light weight and more have a brilliant future. In the course of casting production, because of some restricting factors, the application of light alloy die casting have too many problems to deal with.
    Now the country has set up light alloy research base more professional. The establishment of research centers, for light alloy die casting field opened up a more professional research, the basic research, application development, engineering research and technology transfer of organic integration, speeding up the transformation of scientific achievements, realizes the benign interaction between base, talent training, social service.

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The application and characteristics of die casting mold making

    1, the characteristics of die casting mold making
High pressure and high speed are the two main characteristics of die casting liquid or semi liquid metal filling molding process, this are the basic difference between the die casting technology and other casting method.
    2, the application of die casting mold making
Die casting technology is one of the most advanced metal forming technology, the swarf produces less or even no swarf. At present, the use of alloy die casting is no longer confined to zinc, aluminum, magnesium, copper and so on, but gradually extended to the use of cast iron and cast steel and other iron alloy to produce castings.

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