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Stretching process of flanged cylindrical stamping parts

by:Fortuna     2021-03-04
Flanged cylindrical stamped and stretched parts include narrow flange cylindrical stretched parts and wide flanged cylindrical stamped stretched parts; narrow flanged cylindrical stamped parts are stretched parts with a small flange width. When the part is stretched multiple times, because the flange is very narrow, it can be stretched according to the non-flange cylindrical stamping part, and then the last process is pressed into the required narrow flange shape by the shaping method, in order to make the convex The edge is better shaped. In the last two steps of stretching, a tapered die and a tapered press ring can be used for stretching, leaving a tapered flange, so that the tangential stretching deformation of the flange area can be reduced during shaping. , It is beneficial to prevent the outer edge from cracking; the stretching of wide flange cylindrical stamping parts, when the wide flange cylindrical stamping parts need to be stretched multiple times, the flange size must be equal to the convex part of the stretched part for the first stretch. The size of the flange, the flange size remains the same during the following stretches, only the material transfer of the cylindrical part is used to reach the size of the stretched piece, because in the subsequent stretching process, even the flange part has a small deformation , It will also cause great tensile stress in the force transmission area of u200bu200bthe cylinder wall, which will cause the dangerous section of the bottom to crack. Wide flange cylindrical stamping parts need to be stretched multiple times, and there are two stretching methods; through multiple stretching, the diameter of the cylindrical part is gradually reduced and the height is increased. This stretching method is to directly use cylindrical stamping parts The multi-stretching method is to increase the height by successively reducing the diameter each time, the flange fillet radius and the bottom fillet radius of each stretch are unchanged or gradually reduced; but this method is somewhat flawed , The surface quality of the drawn stamping parts is not high, and the straight walls and flanges retain the traces of rounded corners and local thinning. It is necessary to increase the shaping process in the later stage. It is suitable for small and medium-sized materials with thinner materials and greater height than the diameter. Cylindrical stamping parts with flanges; the method of constant height is adopted, that is, the first stretch is as large as possible for the flange fillet radius and the bottom fillet radius, the height is basically drawn to the required size of the stamping part, and the subsequent stretches As long as the fillet radius and the diameter of the cylindrical part are reduced, the height will basically not change. This method is because the bending of the material in the deformation zone during the drawing process is relatively light, so the drawn part has a smoother surface without bending. mark. Suitable for parts with relatively thick blanks and large rounded transitions that are not easy to wrinkle. Article recommendation: How to calculate the die cost of metal stamping parts? Previous: A brief introduction to the fixing screws of sheet metal stamping parts
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