Forging die CAD / CAM features

Careful study of the characteristics of forging dies, targeted development of forging die CAD / CAM system, in order to ensure the quality of forging die, while improving work efficiency, so that the development of forging die CAD / CAM system meets the requirements of forging process, practical Small and flexible, easy to learn

From the CAD/CAM point of view, the forging die has the following characteristics:

1. Single value of the cavity surface

The surface of the forged model cavity is a smooth single-valued surface. This geometrical feature of the forged model cavity is largely determined by the forging process. If the convexity is not smooth, the forging will collapse due to contact failure during forging; if there is a concave unevenness, there may be a filling dissatisfaction. The single value of the cavity surface is related to the die-out of the forging.

When the cavity surface is three-dimensionally shaped, it is usually necessary to make a smooth transition of multiple surfaces. The use of three-dimensional modeling tools provided by general CAD software for smooth transitions of multiple surfaces requires large-scale complex analytical operations. Different CAD software has different ability to analyze and calculate. Even software with strong analytical capabilities often requires multiple attempts to complete the styling. For the user, it is necessary to constantly explore and accumulate experience in order to successfully complete the modeling work. Therefore, it is a practical topic to study the convenient and practical multi-surface smooth transition algorithm to improve the efficiency of three-dimensional modeling of cavity surface.

2. Forged model cavity has draft angle, transition fillet and parting surface

These shapes are called process shapes. The shape of the forging process increases the number of surfaces that require a smooth transition, thereby increasing the complexity of the three-dimensional shape. Fully considering the characteristics of the process shape, corresponding algorithms are constructed to realize the automatic addition of all or part of the process shape, so that the modeling process can be simplified.

3. Forging the cavity of the model can be done in different ways

The NC machining of the forging model cavity can be carried out in two ways: (1) directly performing the NC machining of the forging model cavity; (2) using the NC machine tool to machine the pole first, and then using the EDM to machine the forging model cavity. Therefore, when the forging die CAD/CAM is implemented, the generated three-dimensional model may be concave (cavity) or convex (electrode). For forging CAD/CAM systems, it should be possible to adapt to both machining methods. Specifically, it should be possible to generate tool paths and NC machining programs for both machining modes.

4. Forging die CAD/CAM and forging process are inseparable

Those familiar with the forging process know that the relationship between the forging process and the forging die is inseparable. The cavity of the forging die is determined by the forging process, and the die is called a process equipment, which ensures the implementation of the forging process. Therefore, in the construction of the forging CAD/CAM system, the tool for the analysis and calculation of the process should be given in consideration of the need of the forging process. These analytical calculation tools are also required for the forging die CAD/CAM itself.

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