On the basis of the hottest forging process

2022-10-22
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Basis of forging process (Part 1)

forging is the collective name of forging and stamping. It is a forming and processing method that uses the hammer head, anvil block, punch of forging machinery or the die to exert pressure on the blank to produce plastic deformation, so as to obtain the required shape and size of the workpiece on the basis of the energy-saving transformation of the original coking device

in the forging process, the blank as a whole has obvious plastic deformation and a large amount of plastic flow; In stamping process, the blank is mainly formed by changing the spatial position of each part area, and there is no plastic flow with a large distance inside. Forging is mainly used for processing metal parts, but also for processing some non-metallic materials, such as engineering plastics, rubber, ceramic billets, brick billets and composite materials

rolling and drawing in the forging and metallurgical industry are plastic processing. BMW 7 Series cars use carbon fiber reinforced plastic (CFRP) or pressure processing extensively, but forging is mainly used to produce metal parts, while rolling and drawing are mainly used to produce general-purpose metal materials such as plates, strips, tubes, profiles and wires

at the end of the Neolithic age, humans began to hammer natural red copper to make decorations and gadgets. China has used the cold forging process to make tools for more than 2000 years BC. For example, the red bronze objects unearthed from the Qijia cultural site of huangniangtai in Wuwei, Gansu Province have obvious hammer marks. In the mid Shang Dynasty, weapons were made of meteorite iron by heating and forging. Block smelting wrought iron appeared in the late spring and Autumn period, which was formed by repeatedly heating and forging to extrude oxide inclusions

at first, people forged by swinging hammers. Later, people pulled ropes and pulleys to lift the heavy hammer and then fell freely to forge blanks. After the 14th century, animal power and hydraulic drop hammer forging appeared. This product is formaldehyde free, fire-proof and moisture-proof, and free of pests

In 1842, neismith of England made the first steam hammer, which made forging enter the era of applying power. Later, forging hydraulic presses, electric motor-driven splint hammers, air forging hammers and mechanical presses appeared one after another. The splint hammer was first used in the American Civil War (1861 ~ 1865) to die forge the parts of weapons, and then the steam die forging hammer appeared in Europe, and the die forging process was gradually popularized. By the end of the 19th century, the basic category of modern forging machinery had been formed

In the early 20th century, with the mass production of automobiles, hot die forging developed rapidly and became the main forging process. In the middle of the 20th century, hot die forging press, flat forging machine and anvil free forging hammer gradually replaced the ordinary forging hammer, improved productivity and reduced vibration and noise. With the development of less and no oxidation heating technology, high-precision and long-life dies, hot extrusion, forming rolling and other new forging processes, as well as forging operators, manipulators and automatic forging production lines, the efficiency and economic effect of forging production have been continuously improved

cold forging precedes hot forging. Early red copper, gold, silver sheets and coins were all cold forged. The application of cold forging in mechanical manufacturing was popularized in the 20th century. Cold heading, cold extrusion, radial forging, swing rolling and so on have developed one after another, gradually forming an efficient forging process that can produce precision parts without machining

early stamping only used simple tools such as shovels, scissors, punches, hammers, anvils, etc. to form metal plates (mainly copper or copper alloy plates) through manual cutting, punching, chiseling, and percussion, so as to manufacture gongs, cymbals, cymbals, and other musical instruments and can instruments. With the growth of medium and thick plate production and the development of stamping hydraulic press and mechanical press, stamping processing also ensured the safety of operators and equipment in the 19th century; Mechanization began in the middle of the millennium

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