Forging is one of the two major components of forging, which is one of the two main components of forging, which is one of the two main components of forging, which is one of the two main components of forging, which is one of the two main components of forging, which is one of the two main components of forging, which is one of the two main components of forging, which is one of the two main components of forging, which is one of the two major components of forging, which exerts pressure on the metal blanks to create plastic deformation to obtain a certain mechanical properties, certain shape and size of forgings.
By forging, the metal can be eliminated from the cast state loose, welding hole, forging mechanical properties are generally better than the same material castings. Important parts with high load and severe working conditions in machinery are made of forgings in addition to sheets, profiles or welds that are simpler in shape and can be rolled.
Forging mold commonly used materials are mainly a variety of components of carbon steel and alloy steel, followed by aluminum, magnesium, titanium, copper and other alloys. The original state of the material is rodmaterials, ingots, metal powders and liquid metals. The ratio of the cross-sectional area of metal before deformation to the die-off area after deformation is called the forging ratio. The correct choice of forging ratio has a lot to do with improving product quality and reducing costs. Forging can be divided into hot forging (processing temperature is higher than the recrystallization temperature of the blank metal), temperature forging (lower than the recrystallization temperature) and cold forging (room temperature).
The following is a description of several commonly used forging molds of steel, characteristics and main uses:
Steel: 5CrNiMo features: quenchability, good tempering stability, main use: for hammer forging, machine forging mold, spiral press forging mold, correction mold
Steel: 4CrMnSiMoV2 Features: good quenching, main use: for small and medium-sized hammer forging mold, spiral press forging mold
Steel: 4Cr2MoVNi Features: Good quenching, main use: for large hammer forging molds and machine forging molds of more than 200mm
Steel: 3Cr2WMoVNi Features: Good tempering stability, main use: for machine forging molds under 200mm
Steel: 8Cr3 features: high strength, main use: more for flat forging mold, cutting edge forging mold
Forging mold in the course of work to be subject to a great impact, at the same time by the alternating effect of heat and cold, lubricant combustion gas corrosion, the forging material with high room temperature and high temperature strength, high toughness, but also requires good thermal conductivity, low coefficient of thermal expansion. Therefore, the quality of internal metallurgy directly affects the life of forging mold. Practice has proved that the metallurgical defects such as white spots, residual shrink holes, bubbles, inclusions, peeling, cracking and severe looseness in steel are one of the reasons for the early failure of the mold. For forging mold materials, especially large-scale hot forging mold steel in addition to the appropriate proportion of alloy elements, the use of vacuum refining or electric slag remelting, is an important way to obtain high toughness, high life mold steel. For forging mold materials for isometric forging, it is necessary to reduce metallurgical defects by using vacuum induction smelting or vacuum induction plus vacuum self-consumption.