Precision forging forming technology (net forming) refers to the forming technology of forging forming layer of parts, which can meet the requirements of parts with only a small amount of processing or no processing. Precision forging technology is not only an important part of manufacturing technology, but also a widely used part manufacturing process in automobile, mining, energy, construction, aviation, aerospace, weapons and other industries. Precision forging technology not only saves materials and energy, reduces processing procedures and equipment, but also significantly improves productivity and product quality, reduces production costs, and improves the market competitiveness of products.

1、 At present, many precision forging processes have been used in production. According to different forming temperatures, it can be divided into hot precision forging, cold precision forging, warm precision forging, compound precision forging, isothermal precision forging and so on.

1.1 hot precision forging process the precision forging process in which the forging temperature is above the recrystallization temperature is called hot precision forging. Hot precision forging materials have low deformation resistance, good plasticity and are easy to form complex workpieces. However, due to strong oxidation, the surface quality and dimensional accuracy of workpieces are low. Closed die forging is commonly used in hot precision forging.

1.2 cold precision forging process cold precision forging is a precision forging process carried out at room temperature. The cold precision forging process has the following characteristics: the shape and size of the workpiece are easy to control to avoid the error caused by high temperature; The workpiece has high strength and precision and good surface quality. In the cold forging process, the plasticity of the workpiece is poor and the deformation resistance is large, which requires a large number of molds and equipment, and it is difficult to form parts with complex structure.

1.3 warm precision forging process warm precision forging is a precision forging process carried out at a suitable temperature below the recrystallization temperature. Warm forging precision forming technology not only breaks through the limitations of large deformation resistance, part shape can not be too complex and the need to increase intermediate heat treatment and surface treatment steps in cold forging, but also overcomes the problem of reducing surface quality and dimensional accuracy due to strong oxidation in hot forging. It has the advantages of cold forging and hot forging at the same time, and overcomes the disadvantages of both.

1.4 compound precision forging process} with the increasing complexity of precision forging workpiece and the improvement of precision requirements, the simple cold, warm and hot forging process can not meet the requirements. The composite precision forging process stitches the cold, overflow and hot forging processes to jointly complete the forging of a workpiece, which can give play to the advantages of cold, warm and hot forging and abandon the disadvantages of cold, warm and hot forging.

1.5 isothermal precision forging process isothermal precision forging refers to die forging of the blank at a constant temperature. Isothermal die forging is often used in the precision forming of difficult to deform materials such as titanium alloy, aluminum alloy and magnesium alloy in aerospace industry. In recent years, it is also used in the precision forming of non-ferrous metals in automobile and machinery industry. Isothermal forging is mainly used for metal materials with narrow forging temperature, especially titanium alloy which is very sensitive to deformation temperature.

2、 Application of precision forging

1. Produce refined blanks and finish machining precision die forgings to obtain finished parts.

2. The production of precision die forging parts is the main part of precision forging parts, eliminating cutting processing, and some parts of parts still need less processing