Low pressure casting refers to the casting method in which the mold is generally placed above the sealed crucible and compressed air is introduced into the crucible to generate low pressure on the surface of the molten metal and raise the molten metal from the riser tube. Fill molds and control solidification. This casting method is well replenished and compact in structure. Easy to cast large, thin-walled, complex castings without risers with metal recovery rates up95%. Easy to automate. However, the equipment cost is high and the production efficiency is low. Generally used for casting non-ferrous alloys. So what are the advantages of low pressure casting?

1. The pouring process parameters of low-pressure casting can be set and adjusted arbitrarily within the process range, which can ensure the smooth filling of the metal liquid, reduce or avoid the phenomenon of metal liquid overturning, impact, splash and so on during the filling process, so as to reduce the formation of oxidation slag. Avoid or reduce casting defects and improve casting quality.

2. Liquid metal filling under pressure can improve the fluidity of liquid metal, has good casting formability, is conducive to the formation of castings with clear contours and smooth surfaces, and is more conducive to the formation of large-size castings.

3. The casting is crystallized and solidified under pressure and can be fully fed, so the casting organization is dense and the mechanical properties are high.

4. Low pressure casting improves the process yield of molten metal. In general, there is no need for risers, which greatly improves the yield of liquid metal, which can generally reach 90%.

Good working conditions, high production efficiency, easy to realize mechanization and automation, which is also the outstanding advantage of low pressure casting.

Low pressure casting has a wide range of applications for alloys and can basically be used for various casting alloys. Not only for casting non-ferrous alloys, but also for cast iron and cast steel. Especially for non-ferrous alloys that are easy to oxidize, it shows its performance, that is, it can effectively prevent the metal from oxidizing and slagging during the pouring process.

Low pressure casting has no special requirements for mold materials. Any material that can be used as a mold can be used as a mold material for low pressure casting. Gravity casting and special casting molds are basically the same, such as sand, shell, metal, graphite, investment casting shell, ceramic and so on. In short, low pressure casting has no strict restrictions on the requirements of mold materials.