Wholesale Zinc Alloy Lamp Pole Fittings Die Casting Manufacturers

How is the cooling and demolding step of Zinc Alloy Lamp Pole Fittings Die Casting carried out?

In the complex process of Zinc Alloy Lamp Pole Fittings Die Casting, cooling and demolding are crucial links, which are directly related to the quality and production efficiency of the final product. This process requires superb technology and in-depth understanding and mastery of material properties, mold design and process parameters.

1. The importance of the cooling stage
The cooling stage is the key period when the metal liquid changes from liquid to solid during the die casting process. In the die casting process of zinc alloy lamp pole accessories, the molten zinc alloy is injected into the mold cavity under high pressure, and then it quickly begins to cool and solidify. The speed of cooling directly affects the organizational structure, mechanical properties and surface quality of the casting.
Influence of organizational structure: Too fast cooling speed may cause greater internal stress in the casting, increase the risk of cracks and deformation; while too slow cooling speed may make the casting grain coarse, reduce its mechanical properties and corrosion resistance.
Influence of mechanical properties: Appropriate cooling rate helps to form a uniform and fine grain structure, thereby improving the strength, hardness and toughness of the casting. This is especially important for lamp pole accessories, because they need to withstand the influence of various external factors such as wind loads and temperature changes.
Influence of surface quality: Temperature control during the cooling process will also affect the surface finish and dimensional accuracy of the casting. Too fast or too slow cooling may cause defects such as shrinkage cavities and shrinkage on the surface, affecting the aesthetics and performance of the product.

2. Selection and implementation of cooling methods
In the die-casting process of zinc alloy lamp pole accessories, the selection and implementation of cooling methods need to be determined according to specific production conditions and product requirements. Common cooling methods include natural cooling, air cooling, water cooling and spray cooling.
Natural cooling: Suitable for small, thin-walled castings or occasions with slow production speed. Natural cooling has low cost and simple operation, but the cooling speed is slow, which may affect production efficiency.
Air cooling: Blowing air to the mold surface through a fan or air duct for cooling. Air cooling has the advantages of fast cooling speed and moderate cost. It is necessary to pay attention to controlling the wind speed and wind direction to avoid adverse effects on the casting.
Water cooling: Use circulating water to cool the mold. Water cooling has the advantages of fast cooling speed and good effect. It needs to be equipped with corresponding cooling systems and equipment, and has certain requirements for water quality and water temperature.
Spray cooling: Spray fine water mist on the mold surface for cooling. Spray cooling combines the advantages of air cooling and water cooling. It can quickly reduce the mold temperature and reduce the impact of moisture on the casting. However, the spray cooling system is relatively complex and requires precise control of the spray volume and spray time.
In the die-casting process of zinc alloy lamp pole accessories, a combination of multiple cooling methods is usually used to achieve the best cooling effect. In the early stage of die-casting, natural cooling or slight air cooling can be used to reduce the thermal shock of the mold; in the middle and late stages of die-casting, the cooling intensity is gradually increased, and air cooling, water cooling or even spray cooling is combined to speed up the cooling speed of the casting and improve its quality.

3. Technical points of demolding process
Demolding is the process of separating the solidified casting from the mold. In the die-casting of zinc alloy lamp pole accessories, the difficulty of demolding directly affects the production efficiency and product quality. , the following are several technical points in the demoulding process.
Mold design: Reasonable mold design is the basis for smooth demoulding. The mold should have sufficient rigidity and strength to withstand the high pressure and high temperature in the die-casting process. At the same time, a reasonable demoulding slope and parting surface structure should be designed to facilitate the demoulding of the casting.
Use of demoulding agent: Applying an appropriate amount of demoulding agent before die-casting can reduce the adhesion between the casting and the mold and protect the mold surface from scratches. However, the amount of demoulding agent used should be moderate. Too much or too little may affect the demoulding effect and product quality.
Control of demoulding temperature: The selection of demoulding temperature should be determined according to the material properties of the zinc alloy and the mold structure. Generally speaking, demoulding can be performed when the internal temperature of the casting drops to a certain range (usually a certain temperature below the melting point of the alloy). Demolding too early or too late may cause deformation of the casting or damage the mold.
Choice of demoulding method: Select a suitable demoulding method according to the shape and size of the casting. Manual demoulding can be used for small and simple castings; while for large and complex castings, it may be necessary to use automated equipment such as mechanical demoulding or hydraulic demoulding.
4. The influence of cooling and demolding on product quality
Cooling and demolding are key links in the die-casting process of zinc alloy lamp pole accessories. Its quality directly affects the performance and service life of the final product.
Internal quality: Reasonable cooling speed and demolding method can reduce the stress and defects inside the casting and improve the mechanical properties and corrosion resistance of the casting.
Surface quality: Proper cooling and demolding operations can avoid defects such as cracks, shrinkage holes, shrinkage, etc. on the surface of the casting, improve the appearance and performance of the product.
Production efficiency: Efficient cooling and demolding process can shorten the production cycle, improve production efficiency and reduce production costs.