Hand Forged
Difference between casting and forging by huifengchen@foxmail.com
Casting is to meet certain requirements of metal melting into a liquid and
poured into the mold, the solidification by cooling, the Qing had to be
scheduled after the whole deal with the shape, size and performance of castings
(parts or blank) in process. The basis of modern machinery manufacturing
industry processes. Low-cost foundry production of rough, for complex shape,
especially the parts with complex cavity better show its economy; the same time,
the adaptability of its wider and has a good comprehensive mechanical
properties. But the cast needed for the production of materials (such as metal,
wood, fuel, modeling materials, etc.) and equipment (such as metallurgical
furnace, sand machine, molding machine, core making machine, sand off the
machine, shot blasting machine, cast iron plate, etc.) than more, and will
generate dust, harmful gases and noise and pollution of the environment. Casting
an early human master, a metal thermal processing technology, about 6,000 years
of history. 3200 BC, Mesopotamia, bronze frog castings appear. 13 ~ before the
10th century BC, between China has entered the heyday of bronze casting,
technology has reached a very high level, such as the Shang dynasty of the
weight 875 kilograms of the Secretary, female E. Fang Ding, the Warring States
Period of the disc and the Western Han Dynasty statue of the Marquis Yi of Zeng
linza are all representatives of the ancient casting products. The early pottery
influenced by the casting, the casting mostly for agricultural production,
religious, and daily life of the tools or appliances, art flatted. BC 513, China
cast out of the world’s oldest written records found in the cast iron pieces –
Jin Zhu Ding (about 270 kilograms weight). Before and after the 8th century AD,
Europe began producing iron castings. The 18th century the industrial
revolution, casting into a new era for large industrial services. Beginning of
the 20th century, the casting fast pace of development, has developed a ductile
iron, malleable iron, low carbon stainless steel and aluminum copper, aluminum
silicon, aluminum-magnesium alloy, titanium, nickel-based alloys such as cast
metal material, and the invention of gray cast iron inoculation treatment of the
new process. After 50 years, there has been high-pressure molding the wet sand,
chemical hardening sand molding and core making, molding, and other specialty
vacuum casting, shot blasting, and other new technology. Are many kinds of
casting, by modeling method used to divided into:
1st: normal sand casting, including the wet sand, dry sand, and chemical hardening.
2nd Special Casting, according to modeling based on natural mineral materials can be divided into sand and gravel as the main form of special casting material (such as investment casting, clay-type casting, foundry shell casting, vacuum casting, solid mold casting, ceramic mold casting, etc.) and metal as the main cast special casting material (such as metal casting, pressure casting, continuous
casting, low pressure casting, centrifugal casting, etc.) categories. Casting process usually includes:
1st mold (so the casting of liquid metal into solid container) prepared according to the materials used in the mold can be divided into sand, metal type, ceramic, clay type, graphite-type and so on, according to frequency of use can be divided into a one-time type, semi-permanent type and permanent type, mold preparation
is advantages and disadvantages of the main factors affecting the quality of castings;
2nd casting of metal melting and casting, casting metal (cast alloy) are mainly cast iron, cast steel and cast non-ferrous alloys;
3rd casting processing and testing, casting processing including removal of foreign ody-type core and casting surface, removal of pouring riser, relief grinding burrs and other projections as well as the Phi seam heat treatment, shaping, anti-rust treatment and rough and so on.
Forging is the use of forging machinery to exert pressure on the metal blank to produce plastic deformation in order to obtain a certain mechanical properties, a certain shape and size of forging processing methods. Forging an integral part of the two. Can eliminate the metal by forging cast loose, welding holes, forging the mechanical properties of the casting in general is better than the
same material. Machinery loads high, harsh working conditions, the important part, in addition to relatively simple shape of the available rolling plates, profiles or welded parts, the multiple use of forgings. Forging Press forming method can be divided into:
1st open-forging (free forging). The use of impact force or pressure to make the two metals in the upper and lower arrival iron (anvil block) in order to obtain the necessary inter-forging deformation, mainly two kinds of hand-forging and mechanical forging.
2nd forging close mode. Metal billets have a certain shape forging die within the compression chamber obtained forging deformation can be divided into forging, cold heading, rotary forging, extrusion and so on. According to deformation temperature can be divided into Hot forging (processing temperature is higher than the recrystallization temperature of the metal billets), warm forging (below the recrystallization temperature) and cold (room temperature). Forging
materials are mainly different compositions of carbon steel and alloy steel, followed by aluminum,
magnesium,
titanium,
copper and its alloys. Material to
its original state with bar, ingot, metal powder and liquid
metals. Metal
deformation before the cross-sectional area and deformation of the die-off area
known as the forging ratio ratio. Forging the right to choose than to improve
product quality, reduced a lot of costs.
About the Author
mail, master degree owner major in material science
Hand Forged Pine Cone
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