The use of castings has a long history. In ancient times, people used castings to make coin sacrificial vessels, weapons, things and some day utensils. However, in modern times, castings are primarily used for machine parts and the blanks may be used directly as machine parts. Castings are beginning to take up more and more shares in mechanical products, and the amount is increasing year by year, and the shapes and types of castings are constantly changing. Castings have gradually become an important part of our daily life. Various types of door handles, door locks, small water pipes and other occasions can be seen in the use of castings.
Castings have excellent mechanical and physical functions. They can have a variety of different strength, hardness, and resistance functions. They can also have one or more special functions, such as wear resistance, high temperature and low temperature resistance, corrosion resistance, etc. .
The weight and scale of the castings are very wide. The lightest weight is only a few grams, the heaviest can reach 400 tons, the thinnest wall thickness is only 0.5 mm, the thickest can exceed 1 meter, and the length can range from a few millimeters to more than ten meters. Satisfy the application requirements of different industrial sectors.
What are the differences between castings and stainless steel forgings?
1. Castings have excellent wear resistance and shock absorption function. Because graphite in cast iron is beneficial to smoothness and oil storage, it has good wear resistance. Similarly, because of the presence of graphite, gray cast iron has better shock absorption than steel.
2. Good casting process function. Because gray cast iron has high carbon content and is close to eutectic composition, it has a relatively low melting point, excellent fluidity, and low shortening rate. Therefore, it is suitable for casting with messy structure or thin-walled castings. In addition, because graphite makes it easy to form chip breaking during cutting, the machinability of gray cast iron is better than that of steel.
3. Stainless steel can improve its arrangement structure and mechanical function after casting. The casting arrangement is through the casting method after the hot working deformation and recrystallization of the stainless steel, the original coarse dendrites and columnar grains become the equiaxed recrystallization arrangement with finer grains and uniform size, so that the original segregation in the steel ingot, The compaction and welding of looseness, pores, slag inclusion, etc., the arrangement becomes more and more tight, and the plasticity and mechanical functions of the metal are improved.
4. The mechanical performance of castings is lower than that of forgings of the same raw material. However, the casting process can ensure the continuity of the metal fiber arrangement, keep the fiber arrangement of the forgings consistent with the shape of the forgings, and ensure that the parts have outstanding mechanical functions and long service life. Fine die forging, cold kneading, warm kneading and other processes are selected. The forgings produced are unmatched by castings.
Whether it is a casting or a stainless steel forging, it is an indispensable part of mechanical production. In mechanical production, according to the different functions of the product, select the corresponding casting or forging. As long as the effect of the casting or forging is fully utilized, the perfect machine can be achieved. product.
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