Flanging refers to the method of forming a straight wall or flange with a certain angle along the edge of a closed or unclosed curve by using the role of a mold on the flat or curved part of the blank. Flanging is a type of stamping process. There are many types of flanging, and the classification methods are also different. Which can be divided into elongated flanging and compression flanging according to deformation properties.
Hole processing method
The processing method of the prefabricated hole determines the edge condition of the hole. When the edge of the hole is free of defects such as burrs, tears, and hardened layers, the smaller the limit flanging coefficient, the better the flanging. At present, prefabricated holes are mainly processed by punching or drilling methods. The data shows that the drilling is smaller than the normal punching min. The conventional punching method has high production efficiency, and is particularly suitable for processing larger holes, but it will form defects such as hardened layers, burrs, and tears on the surface of the orifice, resulting in a larger limit flanging coefficient. After the punching, heat treatment annealing, hole repairing, or flipping in the direction opposite to the punching direction, so that the burr is located inside the flipping hole, can obtain a lower limit flanging coefficient. The method of deburring after drilling can also obtain a lower limit flanging coefficient, but the production efficiency is lower.
Relative diameter of prefabricated holes
The smaller the relative diameter / of the prefabricated hole, the smaller the limit flanging coefficient, which is favorable for flanging. This is because the same prefabricated hole diameter, the greater the thickness of the material, the greater the allowable absolute value of the thickness direction pressure. According to the law of constant volume, the limit tangential strain value at the edge of the deformation zone when cracking increases, It can be seen that the smaller the limit flanging coefficient is.
The limiting flanging coefficient of the spherical punch is smaller than that of the flat bottom punch. In addition, parabolic, tapered, and punches with larger fillet radii are also smaller than the limiting flanging coefficients of flat-bottom punches. When the flange is deformed, the spherical or conical punch is the first contact of the front end of the punch with the prefabricated orifice. . Therefore, with the same flanging aperture D and material thickness t, the prefabricated aperture that can be flanged is smaller, so the limiting flanging coefficient is smaller.
Flanging manufacturing standards: MSS SP-43, ASME B16.9, GB / T12459 and other standards. Materials are carbon steel, stainless steel, alloy steel, etc.
Yishang has 23 years of rich experience in the field of sheet metal manufacturing, not only for flanging, but also for other sheet metal processing technology such as laser cutting, CNC stamping, CNC bending, CNC turning and milling, welding, press riveting, etc. .
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