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Dongguan Jiayuan Hardware Products Co.,Ltd
Add:Dongguan, Guangdong, China, Changan Town, Xin'an Town, Community Village, B, No.4 Gate, Lam Tin Industrial Park, Lam Tin Road
How To Deal With The Cold Isolation Of Die Casting
Dec 11, 2018

Laser cleaning is considered as the most reliable and effective solution because of its non-abrasive, non-contact, non-thermal effect and suitable for various materials. At the same time, laser cleaning can solve the problems that traditional cleaning methods can not solve. For example, when submicron contaminated particles adhere to the surface of die casting die, these particles often adhere tightly. Traditional cleaning methods cannot remove them. It is very effective to clean the surface of die casting die by nano-laser.

In addition, because the laser is non-contact cleaning of die-casting die, it is very safe to clean the precision die or its precise parts to ensure its accuracy. Therefore, laser cleaning has unique advantages in the cleaning industry.

What are the advantages of laser surface cleaning?

1. Laser cleaning is a "green" cleaning method. It does not require any chemical reagents or cleaning fluids. Waste after cleaning is basically solid powder. It is small in size and easy to store and recycle. It can easily solve the environmental pollution caused by chemical cleaning.

Phosphating of aluminium materials: The effects of accelerators, fluorides, Mn2+, Ni2+, Zn2+, PO4, Fe2+ on the phosphating process of aluminium alloy die castings were studied in detail by means of SEM, XRD, potential-time curve and film weight change. The results show that guanidine nitrate has the characteristics of good water solubility, low dosage and fast film formation. It is an effective aluminium phosphating accelerator. Fluoride can promote film formation, increase film weight and refine grain; Mn2+, Ni2+ can obviously refine grain, make phosphating film uniform and compact, improve the appearance of phosphating film; when the concentration of Zn2+ is low, it can not form or form film. Wade's film weight increased with the increase of Zn2+ concentration. The content of PO4 had a great influence on the weight of phosphating film, and the content of PO4 increased. The weight of phosphating film increases with the increase of phosphating film content.

In the production process of aluminium alloy die casting, many problems have arisen, including cold and heat insulation. What is cold separation? Why does this happen? How should we solve this problem? The manufacturer will tell you.

The adiabatic problem of aluminium alloy die castings is obviously manifested by irregular and obvious sinking linear grains on the surface of the castings, which can be divided into penetration and non-penetration. The grain shape is narrow and narrow, and the edges of some junctions are smooth, which may continue to develop under the action of external forces.

There are many reasons for cold separation: firstly, the two metal streams are not fully fused or mixed, which leads to weak bonding force between the two metal streams; secondly, the pouring temperature or die casting temperature is insufficient; thirdly, the selection of alloy materials is inappropriate. LS, poor liquidity; Fourth, the channel position is not right, flow through. Fifth, the filling speed is low and the injection pressure is low.

Aluminum alloy die castings need not worry about cold isolation, but can be solved by the following methods: first, properly increase the pouring temperature and mold temperature; second, increase injection pressure, shorten the filling time; third, increase the filling temperature. Increase the injection speed, increase the cross-section area of the inner gate; Fourth, improve the exhaust and filling conditions; Fifth, correct selection and composition of alloys to improve the fluidity of alloys.

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