The bending die is made of high-quality steel through special heat treatment. It has the characteristics of high hardness, not easy to wear, and can withstand high pressure. However, each set of die has its ultimate pressure: ton/meter, so it must be correct when using the die. Select the length of the mold, that is, how much pressure should be added per meter, and must not exceed the pressure marked on the mold.
So how to choose a bending die for automotive sheet metal fabrication?
Bending dies are divided into standard dies and special bending dies according to the bending process. In the case of standard bending (right-angle and non-right-angle bending), standard molds are generally used for bending, and special molds are used for bending some special structural parts (such as step bending, dead edge, etc.). In addition, when bending sheets of different thicknesses, the selection of the “V”-shaped groove size of the opening size of the bending die is different. Generally, the opening size of the “V”-shaped groove selected is 6-10 times the thickness of the plate (0.5~2.6mm is 6t, 3~8mm is 8t, 9~10mm is 10t, and 12mm or more is 12t).
When the sheet is thinner, the orientation is chosen to be in decimals, and when the sheet is thicker, the orientation is in large numbers. For example: 12mmV slot can be used when bending 2mm board. The standard bending angle is generally not less than 90 degrees, and the sharp angle of the upper die and the lower die of the standard bending machine die is usually 88 degrees. In the case of non-standard bending, different upper die shapes can be selected, and different angles and shapes of the sheet can be bent. For sheet metal parts with special shapes, special bending dies can be selected for forming and bending.
When the material is bent, the outer layer is stretched and the inner layer is compressed in the rounded corners. When the thickness of the material is constant, the smaller the inner r, the more severe the tension and compression of the material; when the tensile stress of the outer fillet exceeds the ultimate strength of the material, cracks and fractures will occur. Therefore, the structure of the bending part Design, should avoid too small bend fillet radius.
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