A brief analysis of how automotive sheet metal parts operators should choose bending molds?

2023-11-14 08:38:56

Bending molds are made of high-quality steel with special heat treatment. They have the characteristics of high hardness, not easy to wear, and can withstand high pressure. However, each set of molds has its own ultimate pressure: tons/meter, so you must be correct when using the molds. Select the length of the mold, that is, how much pressure to add per meter, and it must not exceed the pressure marked on the mold.

So how to choose a bending mold for automotive sheet metal parts processing?

Bending molds are divided into standard molds and special bending molds according to the bending process. In standard bending situations (right-angle and non-right-angle bending), standard molds are generally used when bending, and special molds are used when bending some special structural parts (such as step bending, dead edges, etc.). In addition, when bending sheets of different thicknesses, the opening size of the bending mold "V"-shaped groove size selection 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 board is thin, choose to orient to the decimal number, and when the board is thicker, choose to orient to the large number. For example: when bending a 2mm plate, you can use a 12mm V groove. Standard bending generally bends at an angle of not less than 90 degrees. The sharp angles of the upper and lower molds of a standard bending machine mold are usually 88 degrees. In the case of non-standard bending, different upper mold shapes can be selected to bend the plate at different angles and shapes. For sheet metal parts with special shapes, special bending molds can be selected for forming and bending.

When the material bends, the outer layers in the rounded corners are stretched and the inner layers are compressed. 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 breaks will occur. Therefore, the structure of the curved part Design, excessively small bending fillet radii should be avoided.