Reasonable use of different forging processing technologies in the forging process can greatly improve the quality and production efficiency of stainless steel forging. Fine forging is a forming technology, which can meet the requirements of dimensional accuracy of parts with only a small amount of processing or no longer processing.
There are two main methods to realize precision forging: precision forging blank, that is, directly forging the blank that meets the requirements of precision machining. For precision forged stainless steel forgings, the whole or part of them are directly divided by the precision forging process to reduce the machining amount.
At present, there are many precision forging processes for production. According to the different results, it can be divided into warm forging, hot precision forging, cold precision forging and qualified forging.
Temperature forging is a fine forging technology, which can heat the metal to a temperature below the appropriate recrystallization temperature for forging. It also has the advantages of hot forging and cold forging, avoids their defects, effectively reduces the load of equipment and mold, improves the plasticity and fluidity of metal, and does not require forging annealing.
Hot precision forging refers to the forging process above the recrystallization temperature. Due to the high deformation temperature, the material has low deformation resistance and good plasticity during the forging process, so it is easy to form parts with complex geometry.
Cold precision forging process is a precision forging process that is forged at room temperature. Due to room-temperature forming, the dimensional error caused by thermal expansion and cold shrinkage is avoided, and the shape and size of cold precision forgings are easy to control. At the same time, the surface of stainless steel forgings does not produce oxidation and burns, and the surface quality is high. Therefore, the forging accuracy of hot precision forging and warm precision forging is lower than that of cold precision forging.
The composite fine forging process combines cold, warm and hot forging processes to complete the workpiece forging process, which can play 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, dimensional accuracy and surface quality of the parts produced by the composite fine forging process are higher than those produced by the single forging process. At present, the commonly used composite fine forging processes mainly include temperature forging - cold fine, hot forging - cold forging, temperature extrusion - cold pendulum, hot fine forging - cold extrusion, hot fine forging - cold pendulum, etc.