Die casting overflow do includes vent and reduce oxidation, control molten metal flow, maintain mold temperature uniformity etc.
The role of die casting overflow mainly reflect in the following aspects:
Die casting overflow: venting and reduce oxidation
During the die casting process, molten metal fills the mold cavity under high pressure. And the gas in the cavity needs exhaust through the exhaust system. Overflow wells are usually designed at the edge of the mold to guide the flow of molten metal. And help gas to escape from the mold, thereby reducing the formation of oxides and improving the quality of the casting.
Die casting overflow: control the flow of molten metal
The design of overflow wells helps control the flow path of molten metal to ensure that the metal can evenly fill the mold cavity. For example, overflow wells can guide molten metal around difficult-to-fill areas to avoid defects caused by underfilling or condensation.
Die casting overflow: Maintain mold temperature uniformity
In small castings, overflow wells can increase the total mass of molten metal, thereby helping to maintain mold temperature uniformity. This helps reduce condensation defects caused by uneven temperature, such as cold welding, that is, the molten metal fails to fully fuse.
Optimize mold design
Overflow wells usually design together with the pouring system. Such as gates and runners to ensure that the molten metal can fill the mold smoothly and evenly. The design of the overflow well is also closely related to the cooling system and thermal balance of the mold. Through reasonable overflow design, it can optimize the performance of the mold and improve the production efficiency.
Prevent defects and improve casting quality
The design of the overflow well can reduce pores and defects inside the casting. For example, by reasonably designing the overflow port and the exhaust groove, gas residue and residual porosity can be effectively avoided, thereby improving the overall quality of the casting.
Adapt to different process requirements
In high-pressure casting (such as semi-solid casting), the design of the overflow well is particularly important because it can help control the fluidity of the molten metal, reduce pre-crystallization and condensation defects, and thus improve the mechanical properties and surface quality of the casting.
Reduce energy waste
In some cases, the overflow valve can be used to recycle excess hydraulic oil, thereby reducing energy waste. This design has certain significance in terms of energy saving and environmental protection.
Overflow plays a vital role in the die casting process, including venting, controlling metal flow, maintaining mold temperature, optimizing mold design and improving casting quality. These functions work together to ensure high-quality production of castings.
Haichen die casting machine
Haichen is one Chinese die casting machine manufacturer for more than 10years. At the same time, we produce both high pressure cold chamber die casting machine , hot chamber die casting machine and spare parts. They have durable and highly precise features.
Haichen also produce die casting machine auxiliary equipment. Such as conveyor, vacuum machine, mold temperature controller, industrial robot, sprayer and so on.
We supply cold chamber and hot chamber die casting machine spare parts.
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