The pressure and speed of low pressure casting can be flexibly adjusted during pouring so that casting can be carried out according to different casting shapes. Low-pressure casting mainly adopts bottom injection type filling, which can ensure the stable filling of molten metal, can also effectively avoid the interference of space to molten metal, and avoid the formation of quality defects after the casting is formed. Under the action of pressure, the molded castings have high quality, smooth surface, and high performance. At the same time, low-pressure casting greatly reduces the labor intensity, the environment is better, and the equipment is convenient and practical. Compared with other casting methods, low-pressure casting has certain peculiarities and also possesses very distinct process characteristics.
1. Compared with ordinary casting, low-pressure casting can adopt metal molds, sand molds, stone grinding molds, etc., and its application range is very wide. Therefore, the low-pressure casting method has many advantages over common casting methods. Low-pressure casting is suitable for non-ferrous metals and ferrous metals, which is not achieved by many common casting methods. The filling of low pressure casting is very stable because it mainly adopts the bottom construction type, so the pressure and speed can be adjusted flexibly. Under the action of pressure, the solidification of the molten metal is very sufficient, the utilization rate is high, and the fluidity is better, and the quality of the casting is improved. The more complex the casting, the more it can show its advantages.
2. Features compared with die casting
Low-pressure casting can be used to manufacture many types of castings, and heat treatment can be carried out flexibly according to the actual situation. It can be used to manufacture thin-walled castings as well as thick-walled castings, and it can fully avoid the interference of air during the casting process. , Get high-quality castings, smooth surface, fine structure, and less bubbles. Moreover, the mechanical properties of the castings are very outstanding, with more types, finer, and lower cost.
3. Disadvantages are limited by the location and quantity of gates, and the thickness of the inner wall, so the product will be subject to certain restrictions. In order to fully reflect the good fluidity of the molten metal and ensure that solidification begins at the gate, the casting cycle will be increased and the solidification rate will also slow down. When molten metal fills the cavity, the mechanical properties of the molten metal surface will be limited.
