Foundry is one of the basic processes in modern mechanical manufacturing industry, so many users attach great importance to the quality of products made by metal casting. Recently, EVP vacuum pump manufacturer’s technicians recommended the application of vacuum pump system in metal casting, which can achieve good results. Metal casting is a process in which metal is melted into a liquid that meets certain requirements and poured into the casting mould. After cooling, solidification and cleaning, the casting with predetermined shape, size and properties can be obtained. Foundry hair germ can be almost formed, and the cost and time can be reduced to a certain extent to achieve the goal of no mechanical processing or a small amount of processing.
Casting is a metal forming object obtained by various casting methods, that is, the melted liquid metal is injected into the pre-prepared casting mold by pouring, injection, inhalation or other casting methods. After cooling, grinding and other subsequent processing means, the object with certain shape, size and performance is obtained.
Why vacuum pump system is used in metal casting?
Impregnation of metal castings and powdery metal parts means blocking leakage due to voids. Injection materials such as liquids enter the voids in the wall of components through vacuum and pressure. Then the material solidifies and fills the permeable opening to make the parts pressure-resistant and sealed.
Castings can be classified into steel castings, iron castings, copper castings, aluminum castings, magnesium castings, zinc castings and titanium castings according to the different metal materials used. Each castings can be further divided into different types according to their chemical composition or metallographic structure. For example, cast iron can be divided into gray iron castings, nodular iron castings, vermicular iron castings, malleable iron castings, alloy iron castings, etc. According to the different casting methods, castings can be divided into ordinary sand castings, metal castings, die castings, centrifugal castings, continuous casting, investment castings, ceramic castings, electroslag remelting castings, bimetal castings, etc. Among them, common sand castings are the most widely used, accounting for about 80% of the total castings output. Aluminum, magnesium, zinc and other non-ferrous metal castings are mostly die castings.
Metal casting processes usually include:
1. Casting preparation (making liquid metal a container for solid casting) can be divided into sand mould, metal mould, ceramic mould, mud mould and graphite mould according to the materials used, and can be divided into disposable mould, semi-permanent mould and permanent mould according to the number of times used. The quality of casting preparation is the main factor affecting the quality of castings.
2. Melting and pouring of casting metals. Casting metals (casting alloys) mainly include cast iron, cast steel and cast non-ferrous alloys.
3. Casting treatment and inspection, including removal of foreign bodies from core and surface of castings, removal of risers, relieving burrs and drapes, heat treatment, shaping, anti-rust treatment and rough processing.
In metal casting, the vacuum pump system can not only make the gas in the impregnated material escape and form voids and channels, which is conducive to the infiltration and diffusion process of impregnated material, but also can form a high concentration of infiltrated material on the surface of impregnated medium in vacuum environment compared with atmospheric pressure impregnation. Combined with the application principle of the vacuum pump system mentioned above, the operation time of vacuum impregnation is shorter than that of atmospheric impregnation, the consumption of raw materials is reduced and the quality can be effectively improved.
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