![]() ![]() 1 inches from the inside of the bend (.40 *. Common K factors used in designing with mild steel are. 5 where the bend is three times or more larger than the material thickness. 4 (where the bend radius is equal to or less than the material thickness), up to. K factors for mild steel air bent in a v-die range from. ![]() K-factors are generally found empirically. The neutral factor is a function of the bending die arrangement, the sheet thickness, the bend radius, and the properties of the material itself. The neutral axis is located by multiplying a correction factor, the k-factor, by the material thickness. The neutral axis is generally shifted toward the inside of the bend. It would be convenient if the neutral axis lay perfectly in the center of the sheet, but this only happens when the bend radius (the internal radius) is more than three times larger than the material thickness. The volume of the compressed and pulled material is unchanged, it flows outward (compression zone) and inward (tensions zone) along the bend. It is called the “neutral axis” and its length does not change during bending. The boundary between these zones is in neither tension nor compression. ![]() When the part is bent, the outside of the bend is placed in tension and the inside is placed in compression. The length of the blank (unbent part) below is somewhere between the length of the interior and the length of the exterior. ![]()
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