Precision forging and forming technology refers to the part forming technology that can be used with little or no processing after the basic forming of the part, also known as near-net forming technology. This technology is developed based on conventional forging and forming technology, and is an application technology integrated by computer information technology, new energy, new materials, etc. At the present stage, precision forging and forming technology is mainly used in precision forging parts and refining blanks, etc.
Precision forging and forming technology, it has obvious advantages, low cost, high efficiency, energy saving and environmental protection, high precision. There are many types of this forming process, according to the forming speed: high-speed precision forging, general precision forging, slow speed precision forging forming, etc.; to forging process metal flow condition as the standard classification: semi-closed, closed, open precision forging forming process; according to the forming temperature: super plastic, room temperature, medium temperature, high temperature precision forging forming, etc.; according to the forming technology is divided into: shunt forging, isothermal forging, compound forging, warm precision forging forming, hot Precision forging forming and cold precision forging forming, etc. According to the forming technology of fine forging technology, has become the production of people are accustomed to the classification of the way.
1. Double-action forging
This process is one of the more advanced fine forging technologies. This technology is through a punch in the closed groove inside the one-way extrusion or two punch two-way reactive extrusion and make the metal once formed, the formed parts belong to the near net forgings without flying edge. The reason for using plug forging is to increase the material utilization rate and reduce the complexity of the machining process. Closed forging is capable of forming complex shapes and achieving large deformations in a single operation, eliminating the need for most cutting in the production of complex parts and effectively reducing costs.
2. Isothermal Forging
Isothermal forging refers to the process of forging and processing of the blanks in a die at a constant temperature to form a fine forged part. Compared with conventional forging, isothermal forging can control the heating temperature of the blank within a certain range, so that the temperature during the forging process is approximately equal, which greatly improves the plastic change of the die due to sudden temperature change during the process. Due to the characteristics of isothermal forging process, it is especially suitable for fine forging of materials that are sensitive to deformation temperature or difficult to form, such as magnesium alloy, aluminum alloy, etc.
3. Shunt forging
The important part of the diverging forging technology is to establish a material diverging channel in the forming part of the die or blank to ensure a good filling effect. With this technique, as the cavity is filled with material, a portion of the material is left in the diversion channel, creating a diversion that helps to fill the hard to form parts. The advantages of split-flow forging are the ability to avoid closures, good forming results when forming gears, the ability to achieve the required accuracy, the lack of post-forming reworking, and the long die life.
4. Isothermal forging
Isothermal forging refers to the process of forging and processing of blanks in a die at a constant temperature to form a fine forged part. Compared with conventional forging, isothermal forging can control the heating temperature of the blank within a certain range, so that the temperature during the forging process is approximately equal, which greatly improves the plastic change of the die due to sudden temperature change during the process. Due to the characteristics of isothermal forging process, it is especially suitable for the fine forging of materials sensitive to deformation temperature or difficult to form materials, such as magnesium alloy, aluminum alloy, etc.
5. Cold forging forming
In the case of forging metal materials without heating, called cold forging, there are two main cold upsetting and cold extrusion technology. Compared with other processes, its advantage is that the shape of the workpiece is easy to grasp, there will be no deformation due to high temperature, the disadvantage is that the impedance in the deformation process, the workpiece plasticity is poor.
6. Composite fine forging forming
Composite fine forging forming process refers to the technology of integrating multiple forging methods, or combining other material forming technologies and forging processes. The traditional process of processing materials and parts has great limitations, and the composite process developed on the basis of the traditional process can not only enhance the strengths and avoid the weaknesses, combined with the strengths of each, but also in the scope of the processing object has been extended.
7. Hot finishing forging forming
Hot finishing forging is a precision forging technology that finds a suitable temperature above the recrystallization temperature as the processing temperature. However, compared with the warm finish forging technology, it will occur violent oxidation due to the higher temperature selected, resulting in poor surface quality and insufficient accuracy of forgings.
8. Warm finishing forging forming
Warm finishing forging technology is a precision forging technology to find a suitable temperature below the recrystallization temperature as the processing temperature. When choosing the temperature, it is better to choose the time when the plastic deformation of the metal is better, and before the strong oxidation occurs.
