Usually in the process of sheet metal processing, our operating area is unrestricted, but when the operating area is very small, or directly on a small steel plate, the operating area is restricted. In this case, the method of the laughing material is usually called the steel plate method. Generally speaking, the component suitable for the steel plate cutting method is simple in shape, simple in structure, small in size and easy to expand, such as straight round tube, rectangular tube, small elbow, positive cone, positive pyramid and so on.
Our usual method is triangulation expansion, dividing the inner circle twelve of the plane circle, and then dividing the side surface of the cone into twelve small trapezoid according to the connection. Then connect the small trapezoidal diagonal line, then form twenty-four small triangles, and then expand the small triangles one by one through the steps of seeking truth length and so on, and complete the expansion map.
When using the steel plate down method to draw a line, the layout and the unfolding are often repeatedly painted on the same plate because of the limitation of the operating area. Therefore, special attention should be paid to the resolution of the lines, and different colors should be applied when necessary.
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