Process method of precision forging
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, composite precision forging, isothermal precision forging, etc.
Hot precision forging process
The precision forging process whose forging temperature is above the recrystallization temperature is called hot precision forging. Hot precision forging materials have low deformation resistance and 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.
Cold precision forging process
Cold precision forging is a precision forging process at room temperature. The cold precision forging process has the following characteristics: the shape and size of the workpiece can be easily controlled 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. It requires a lot of tools and equipment, and it is difficult to form parts with complex structures.
Warm precision forging process
Warm precision forging is a precision forging process conducted at a suitable temperature under the recrystallization temperature. The warm forging precision forming technology not only breaks through the limitations of large deformation resistance, less complex part shape, and the need to increase intermediate heat treatment and surface treatment steps in cold forging, but also overcomes the problems of reducing surface quality and dimensional accuracy due to strong oxidation in hot forging. It has the advantages of both cold forging and hot forging, and overcomes the disadvantages of both.
Composite precision forging process
With the increasing complexity of precision forging parts and the improvement of precision requirements, simple cold, warm and hot forging processes can no longer meet the requirements. The composite precision forging process sews the cold, hot and overflow forging processes together to complete the forging of a workpiece, which can give play to the advantages of cold, warm and hot forging and discard the disadvantages of cold, warm and hot forging.
Isothermal precision forging process
Isothermal precision forging refers to die forging forming of blank at a constant temperature. Isothermal die forging is often used in the precision forming of hard deformation materials such as titanium alloy, aluminum alloy and magnesium alloy in aerospace industry, and also in the precision forming of nonferrous metals in automobile and machinery industry in recent years. Isothermal forging is mainly applied to metal materials with narrow forging temperature, especially titanium alloys which are very sensitive to deformation temperature
China has become a major global equipment manufacturing country, and its level of autonomy has improved
On August 2, CRCC Heavy Equipment Base was completed and put into operation in Xiangyang, Hubei Province. The picture shows a 900 ton beam carrier in production. On July 28, the cold leg bend of the main pipe of Unit 1 of Sanmen Nuclear Power Station, the world's first third-generation AP1000 nuclear power plant, completed the bending forming process in the hydraulic locomotive workshop of China Erzhong Forging Branch, marking that Erzhong has mastered the most difficult bending forming core technology in the manufacturing process of the cold leg bend of AP1000.