Introduction
During thermo-mechanical forming process, the interference between female and die elements directly affects the formation of the component. A correct deviating gap should be ensured. It is an indispensable process parameter for the thermo-mechanical forming process to make forming conditions reasonable during the forming process to ensure component quality and make it possible to smoothly carry out the industrial forming process.
1.1 Gap size and its influence
The gap size between the female and die elements during hot pressing should be reasonable, yet the actual gap size is difficult to control. The gap size between the female and die elements is too large, resulting in a significant reduction in the contact area between the material and the female die, resulting in a decrease in the forming pressure, which may even lead to insufficient deformation, thus resulting in a low forming accuracy. The gap size between the female and die elements is too small, on the other hand, and the forming pressure is too large, which may cause wear on the surface of the female die, further affecting the component accuracy and surface quality. Therefore, deviation between female and die elements should be strictly controlled by reasonable gap size during hot pressing.
1.2 Determination of the gap size
Generally, there are two methods for determining the gap size between the female and die elements when hot pressing components. The first method is the matrix method, which is generally suitable for symmetrical parts with simple structure. The second method is the empirical method, which is suitable for various components with complicated structure. In the matrix method, the deviation gap between the female and die element matrices should be determined by the value of the deviation matrix. In the empirical method, the deviation gap between the female and die element matrices should be determined according to the data collected from the actual hot pressing experiments.
1.3 Gap size control
In order to ensure the uniformity and accuracy of the parts during hot pressing, the deviation gap between the female and die elements should be well controlled. Generally, air pressure, oil pressure and other control methods are used to control the size of the gap. For example, by increasing the air pressure or increasing the oil pressure, the size of the gap can be changed. At the same time, the temperature of the metal during hot pressing should be strictly controlled to ensure the accuracy of the parts.
Conclusion
In conclusion, the gap size between the female and die elements during hot pressing should be reasonable, which is an indispensable process parameter for the thermo-mechanical forming process. There are two methods to determine the gap size between the female and die elements, the matrix method and the empirical method. In order to ensure the uniformity and accuracy of the parts during hot pressing, the gap size should be properly controlled.
