The selection and application of the forging

2017-01-06

Forging is under intense pressure after flattening, metal extrusion blow or to get have a kind of high strength metal parts processing. In general, (except for special cases), preheating before forging metal needed to achieve the desired temperature. Need special attention is, forging and casting is completely different, forgings don't like the casting pouring metal melting it after.


Relative to the other metal pieces of metal processing approach, forgings with higher strength. This is when people is strict with reliability and security, often choose the reason of forgings. But, under normal circumstances, people rarely seen forgings as internal assembly components are used in aircraft, automobile, tractor, ship, oil drilling equipment, engine, missiles and other major equipment.


Forgings are diversified in terms of size, shape and complexity, from the hammer and wrench toolbox to Boeing and NASA's space shuttle in 747 with precision tolerance of the components. In fact, there are 18000 parts in the Boeing 747 are forging. Some of the larger customers include aerospace, national defense construction, automotive industry, agriculture, construction, mining, industry and general industrial material conveying equipment, etc. The largest industry - custom forging - more than $6 billion in sales. These custom forgings are from the United States, Canada and Mexico about 250 of the 300 factories forging enterprise production.


Almost all metals can be forged. However, some commonly used metal mainly includes: carbon steel, alloy, stainless steel, tool steel, aluminum, titanium, brass, copper, and high temperature alloy containing cobalt, nickel, molybdenum. Each has a different strength and weight of the metal. According to the different characteristics of the metal and the application on the customer request special parts. While driving system and the style is very diverse, but any of the following equipment can produce forgings.


Forging hammer: driving force of 50000 pounds, arise through controllable shock struck metal deformation;


Press: driver reached 50000 tons, by controlled pressure extrusion metal produce vertical deformation;


Upset: is the most basic has been applied in a horizontal heading rough machining forging process. Roll forging ring is the use of circular hollow metal parts by kun son rolling under the relative pressure, for extrusion (without welding) ring.


Using the above several kinds of process of forgings can make designers to some extent reflects the basic advantages of forgings. Directional strength forging to improve the microstructure of metal and make it produce the best rheological grains, in order to achieve the desired directional characteristics. For example, tensile strength, ductility, impact resistance, crack resistance and fatigue resistance. The structural integrity of forgings is not affected by the state of the internal porosity and osteoporosis. Make the metal forging process becomes relatively even, make its have unified mechanical performance and achieve the desired effect of heat treatment. Deformation and dynamic mechanical properties through proper grain flow in combination with the height of the material uniformity, greatly improved the forging of impact resistance, crack resistance and fatigue resistance. These features make the forgings has unique advantages in security and related fields.