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Typical precision forging technology
Precision forging refers to the forming technology that meets the dimensional accuracy requirements of parts without a small amount of machining or machining. There are two main ways to achieve precision forging: refined blanks, that is, directly forged blanks that meet the requirements of precision machining. Precision forgings, all or parts of the parts are directly processed by precision forging, thus reducing the amount of machine added. There are many precision forging processes currently used in production. According to different forming temperatures, it can be divided into hot forging, cold forging, warm forging, and composite forging.
1. Hot precision forging process
Hot forging refers to a precision forging process in which forging is performed at a temperature above the recrystallization temperature. Since the deformation temperature is high, the deformation resistance of the material is low and the plasticity is good at the time of forging, so that it is easy to form a part having complicated geometry.
2. Cold precision forging process
The cold forging process is a precision forging forming technique for forging at room temperature. Due to the forming at room temperature, the dimensional error caused by thermal expansion and contraction is avoided, so the shape and size of the workpiece for cold precision forging are easier to control, and the surface of the forging does not produce oxidation and burning, etc., and has a high surface quality, so the hot essence The forging precision of forging and warm precision forging is lower than that of cold precision forging.
3, warm precision forging process
Warm forging is a precision forging technique in which a metal is heated to a temperature suitable for a temperature below the recrystallization temperature. It has the advantages of hot forging and cold forging, avoiding their defects, effectively reducing the load on the equipment and the mold, improving the plasticity and fluidity of the metal, without forging annealing.
4, composite precision forging process
The composite precision forging process combines cold, warm and hot forging processes to complete a forging technique of workpiece forging. It can exert the advantages of cold, warm and hot forging, and avoids the disadvantages of cold, warm and hot forging. At the same time, the parts produced by the composite precision forging process have improved mechanical properties, dimensional accuracy and surface quality compared to those produced by a single forging technique. At present, the common composite forging process mainly includes warm forging - cold finishing, hot forging - cold forging, warm extrusion - cold pendulum, warm precision forging - cold extrusion, hot precision forging - cold pendulum and so on.
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