Triangular hood consists of arcs with different sizes and different directions, and looks like a waist triangle. When the arcs of 10 sizes around the side wall are stretched, the materials at the small arc are in the direction of the large arc. Flowing can reduce deformation, but its cutting is still larger than the adjacent large arc, which is easy to wrinkle. The other wall is a curved slope, which can be calculated according to 6 cylindricals when stretching.

1. Calculation of the remaining amount of edge: During the stretching process, due to the effects of material performance, thickness of the plate thickness, mold gaps, friction and positioning of inaccurate positioning, the surroundings are often uneven. When the size of the capacity, the amount of edge should be added.

2. Calculation of the size of the blank: According to the principle of equal the surface area of the components before the stretching, roughly calculate the diameter of the gaps of the cylindrical. The stretching height H is obtained by the part of the part. According to the computing diameter of the diameter of the calculated rough, you can get a round rough. Considering the simple and low cost of the round blanking mold, 270mm rough is used.

3. Determination of the tensile coefficient and number of stretching times: The number of stretching times should ensure that the internal stress inside the blank does not exceed the limit of the material, and the plasticity of the material can be fully utilized. Therefore Deformation. Except for the three small rounded corners, it can be stretched at a time. Although the small rounded corner cannot be stretched at a time, considering that the parts structure is not purely stretched by the tube, the large arc connects them with them. The surface of the stretch coefficient can still be stretched at one time, so it can be plasticized to the design size after one stretching. At the same time, the tendons at the bottom of the shell were also pressed when stretching.

4. The mold design is the same as that of the general rotor stretching membrane structure. The different places are that the pressure edges of the crushing ring do not rely on rubber but use 8 nitrogen cylinders, which are both conducive to stretching and simplifying the design and manufacturing of the mold. We use 100T oil compressor to stretch. Due to the complex shape of the hood structure, the mold processing is difficult. It is necessary to ensure that the gap between the convex mold is uniform, especially the reinforcement of the gluten. The models used need to be accurate. The peripheral outline of the gap is guaranteed by the line cutting program, and the mold slope and the arc are trimmed by a fitter.