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In the die casting industry, choosing the right material is crucial to producing high-quality, high-performance die casting parts.
Die-casting alloy is one of the elements of die-casting production, in order to produce excellent die-casting parts, in addition to having a reasonable part structure,In addition to the design of a complete die casting mold and a die casting machine with superior process performance, it is also necessary to have good alloy materials.According to the characteristics of the die casting process, there are the following basic requirements for die casting alloys:
1.
When the overheating temperature is not high, it has good fluidity, which is easy to fill the complex cavity to obtain a good quality die casting parts.
2.
The line shrinkage rate and crack tendency are small, so as to avoid cracks in the die casting, so that the die casting has higher dimensional accuracy.
3.
The crystallization temperature range is small to prevent excessive shrinkage and shrinkage of die-casting parts.
4.
It has a certain high temperature to prevent deformation or rupture when rolling out the die casting parts.
5.
It has a high strength at room temperature to meet the needs of the production of large thin wall complex die casting parts.
6.
The tendency of physical and chemical interaction between the mold wall is small to reduce the viscosity and mutual alloying.
7.
It has good processing properties and certain corrosion resistance.
1
The density of magnesium is the lightest of the three metals, with a density 30% lighter than aluminum alloy and 80% lighter than steel. Moreover, magnesium alloy has a high strength, the yield strength can reach 160 mpa, the tensile strength of 240 mpa, it can be widely used in electronic products, aerospace and other fields with high strength requirements.
Advantages of magnesium alloys die casting
(1) If conditions permit, the thickness of magnesium alloy casting can be as thin as 0.6 mm, which is inaccessible to other materials, and magnesium alloy die casting molding is easier, but also has good machinability, so it is more suitable for large-scale production.
(2) The shock absorption performance of magnesium metal is very good, can absorb a lot of surrounding vibration and noise, so it is more suitable for use in the backplane of the LCD screen.
(3) Magnesium alloy has good electromagnetic shielding property. Modern electronic products need a good electromagnetic shielding shell, in order to better isolate all kinds of electromagnetic interference, and magnesium alloy can be a good job to complete this task.
Disadvantages of magnesium alloys die casting
Under the current technical conditions, magnesium alloy still has its defects:
(1) Although magnesium alloy can be cast into ultra-thin castings, relatively speaking, magnesium alloy castings also have certain limitations, can only be cast in a specific size, can not be too thick.
(2) Die casting alloy varieties are few, for example, a mobile phone can only use AZ91D alloy, other alloys can not be replaced.
(3) The physical characteristics of magnesium itself lead to the magnesium alloy is not suitable for hot processing, and in the absence of gas protection conditions, it is not suitable for the use of welding technology.
2
Zinc alloy die casting
Zinc alloy is mainly zinc as raw material, and the added metal elements are mainly aluminum, copper, magnesium, titanium and so on.
The advantages of zinc alloys die casting
1.The melting point is lower than the other two alloys, and there is a good flow after melting, and fusion welding, brazing and plastic processing can be used.
2.Like aluminum alloy, zinc alloy also has strong corrosion resistance, and the remaining waste can also be recycled and remelted, which is a green pollution small material.
3.Zinc alloy can also be processed by a variety of processing methods, through electroplating, sandblasting, painting, shot blasting, grinding and other methods to achieve the desired effect.
4.It has good mechanical properties and wear resistance at room temperature.
The disadvantages of zinc alloys die casting
1.The density of zinc is larger than the other two metals, and the density of iron is comparable, so its use has great restrictions.
2.There is no good corrosion resistance. Die castings will age due to corrosion.
3.Although zinc alloy has good mechanical properties at room temperature, it is not suitable for use in too high or too low temperature environments, because zinc alloy will reduce its impact performance at high and low temperatures.
3
Aluminum alloy die casting
Aluminum alloy usually refers to the general term of raw materials composed mainly of aluminum, plus zinc and other alloys.
The advantages of aluminum alloy die casting
1.Aluminum die casting can manufacture aluminum alloy parts with more complex shapes and thinner walls, with high molding accuracy and almost no loss
2.Aluminum die-cast parts have a high surface finish, the surface does not require subsequent processing, and can be used directly. Since the liquid material of aluminum alloy has good fluidity when injected into the mold, the die casting method can make the aluminum material fully fill the concave and convex part of the mold to form a smooth and uniform surface part.
3.The die casting method can make the aluminum alloy material reach a higher density and the complex structure is not easy to deform, improving the mechanical properties and durability of the parts.
4.Aluminum die-casting is the use of aluminum alloy material, aluminum alloy has the advantages of lighter and stronger, so it is widely used for manufacturing parts in automotive, aviation, electronics and other industries. Because the use of aluminum alloy materials can reduce the weight of parts, while maintaining the high strength of important parts, the use of materials has become more economical.
5.Aluminum die casting is lower than traditional machining costs, and parts can be manufactured in a short time, so the production efficiency is extremely high. Parts manufactured by aluminum die casting are widely used to complete many different jobs and tasks.
The disadvantages of aluminum alloy die casting
1.It is easy to produce large concentrated shrinkage holes at the final solidification
2.Has a strong affinity with iron, easy to stick mold.
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