Precision forging refers to the forming technology that meets the requirements of dimension precision of parts with little or no processing after forging and forming.There are two ways to achieve precision forging forming: precision blank, that is, direct forging to meet the requirements of precision machining blank.Precision forging, the whole or parts of some parts directly by the process of precision forging, thus reducing the amount of machine.At present, many precision forging processes are used in production.According to the different forming temperature can be divided into hot precision forging, cold precision forging, warm precision forging, composite precision forging and so on.
- Hot precision forging process
Hot precision forging refers to the process of forging above the recrystallization temperature.Because the deformation temperature is high, the deformation resistance of the material is low and the plasticity is good when forging, so it is easy to form the parts with complex geometry.
- Cold precision forging process
Cold precision forging is a kind of precision forging forming technology which is forged at room temperature.Due to the room temperature forming, avoid the dimensional error caused by hot expansion and cold contraction, so the shape and size of the workpiece of cold precision forging is easier to control, and the surface of the forging does not produce oxidation and burning loss, etc., with higher surface quality, so the forging precision of hot precision forging and warm precision forging is lower than that of cold precision forging.
- Warm precision forging process
Warm forging is a precision forging technique in which metals are heated to a suitable temperature below the recrystallization temperature.It has the advantages of hot forging and cold forging at the same time and avoids their defects, effectively reduces the load of equipment and die, improves the plasticity and fluidity of metal, and does not need forging annealing.
- Composite precision forging process
Composite precision forging technology is a forging technology that combines cold, warm and hot forging technology to complete the forging of a workpiece. It can give full play to the advantages of cold, warm and hot forging and avoid the disadvantages of cold, warm and hot forging.At the same time, the mechanical properties, dimension precision and surface quality of the parts produced by composite precision forging technology are improved compared with those produced by single forging technology.At present, the commonly used composite precision forging technology mainly includes warm forging – cold finishing, hot forging – cold forging, warm extrusion – cold rotary rolling, warm hot precision forging – cold extrusion, hot precision forging – cold rotary rolling and so on.