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How should the operator of automobile sheet metal parts choose the bending die?

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.

Automotive Sheet Metal Fabrication

Pintejin Sheet Metal shop offers a cost-effective solution for a wide range of industries with our custom metal stamping and custom sheet metal fabrication capabilities. Our stampnig operations include a variety of sheet-metal forming manufacturing processes, such as punching, blanking, embossing, bending, flanging, and coining. Our professional, experienced and well-trained engineers can execute the complex metal stamping operations with precision and accuracy.

No matter what your metal fabrication needs are, Pintejin can offer the right solution: from single sheet metal part or sub-assembly of stamped metal parts to turnkey solutions for mechanical and electrical assemblies. We have the technology, equipment and the experience to fabricate customised metal products from aluminium sheet metal fabrication, steel, zinc plated steel, stainless steel sheet metal fabrication, brass and copper. Designs that require CNC machining of surfaces or components can be accommodated. We can supply polished, galvanized, zinc coated or powder coated finishes for any sheet metal work or stamped metal components. Coupled with our accurate and reliable metal fabricating equipment, we guarantee precision and repeatability in custom sheet metal work. You’ll be taking advantage of the best sheet metal fabrication china can produce.


With Pintejin automated and highly streamlined sheet metal fabrication service, you can expect a sheet metal fabrication quote within 12 hours and lead times as quickly as three days.Our rapid prototyping offering also includes a solid and reliable manufacturing capability (led by our expert team with 15+ years of experience) and technical and quality assurance, including SGS and RoHS material certifications, in-process quality reports, and First Article Inspection.



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