Characteristics of Forged Valves
Jun 15, 2020
Characteristics of Forged Valves:Compared with castings, forging process improves the organizational structure and mechanical properties of the metal. After the casting structure is hot processed and deformed by forging method, due to the deformation and recrystallization of the metal, the original coarse dendrite and columnar crystal grains are changed into equiaxed recrystallized structures with finer grains and uniform sizes, so that the original segregation, looseness, porosity, slag inclusion and other compaction and welding in the steel ingot become more compact, and the plasticity and mechanical properties of the metal are improved, which perform better than castings of the same material especially in mechanical properties. In addition, the forging process can ensure the continuity of the metal fiber structure, keep the fiber structure of the forging consistent with the shape of the forging, and ensure the integrity of the metal flow line, to ensure that the parts have good mechanical properties and long service life. Forgings produced by precision die forging, cold and warm extrusion and other processes are incomparable to the castings. Forgings are objects in which metal is pressed to shape the required form with appropriate compression force through plastic deformation. This power is typically achieved through the use of hammers or other pressure. The casting process builds a fine grain structure and improves the physical properties of the metal. In the actual use of components, a correct design can make the particle flow in the direction of the main pressure. Castings are metal molded articles obtained by various casting methods, i.e. molten metal is poured into a pre-prepared casting mold by casting, injection, suction or other casting methods, and then cooled, sand-removed, cleaned and post-treated, etc. to obtain articles with certain shapes, sizes and properties.
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