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What is the cause of mildew in aluminum alloy die castings?
Die casting is a metal forming process, and its biggest feature is fast forming speed and low processing cost, so it has a very wide range of applications in metal processing. The metal parts produced by the die-casting process are called "die-casting parts", and die-casting parts are widely used in machinery, automobiles, electrical appliances, etc. Aluminum alloy is a common die-casting material, but it must be noted that for different metal materials, the pre- and post-processing of die-casting is different. Some netizens reported that mold spots often appear in aluminum die castings. What is the reason? Today, Ruiguan Precision will answer this question for you:
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2021
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Cause analysis and preventive measures of zinc-aluminum alloy die casting die
In the process of die-casting production, everyone knows that there will be die-drawing phenomenon in both aluminum alloy and zinc-alloy die-casting, which not only increases the defect rate of the product, but also hinders the production efficiency of die-casting, so the phenomenon of die-drawing occurs in zinc-aluminum alloy die-casting. What is the reason? Let's analyze it for you.
Cross Use of Stainless Steel Precision Casting and Rapid Prototyping Technology
The cross-use of science and technology is mostly complementary. The design and mold manufacturing in the wax mold making process of stainless steel precision casting are more complicated and time-consuming, but rapid prototyping technology can make up for this shortcoming. Using rapid prototyping technology alone is a Because material restrictions cannot be implemented, in recent years, many use polymer technology to obtain the round shape of the casting, and then manufacture wax molds, which are used in stainless steel precision casting.
Process characteristics of stainless steel precision casting
Stainless steel has higher mechanical properties than cast iron for precision casting, but not as good as cast iron. Due to the high melting point of stainless steel precision casting, the fluidity of molten steel is poor, the molten steel is easily oxidized, and the shrinkage is large. The linear shrinkage is about 1.8-2.5%, and the volume shrinkage rate is about 10-14%.
Stainless Steel Precision Casting: Specific Requirements for Foundry Sand
The particle shape and particle composition of foundry sand have an impact on the fluidity, compactness, air permeability, strength and permeability of liquid metal of the foundry sand, and are important indicators of the quality of the foundry sand.
Process operation specification for precision casting wax pressing process
Check whether the wax pressing and oil pressure, heat preservation temperature, and operation buttons are normal, and adjust the pressure of the wax pressing machine, the temperature of the wax injection nozzle, the holding time, the cooling time, etc. according to the technical regulations.