News 
News 
News -
Contact Us
-
Phone number：+1-312-443-3605
Fax：
E-Mail：root@osirsmybou.com
Addresses：The Art Institute of Chicago, 111 S Michigan Ave, Chicago, IL 60606
How to choose the upper die radius of the bending machine
Category：answer Publishing time：2025-12-05 04:05:27 Browse： Times
During the sheet metal processing process, the bending machine is a very critical equipment, and its processing quality and efficiency largely depend on the selection of molds, especially the radius selection of the upper die (male die). The correct selection of the upper die radius is not only related to the accuracy of the bending angle and the surface quality, but also affects the occurrence of problems such as material springback and cracking. Therefore, it is crucial to scientifically and reasonably select the upper die radius in actual operation.
One, The influence of the upper die radius on the bending effect
1. Control the bending angle and springback
The upper die radius directly affects the bending angle and springback of the workpiece. Generally, a smaller upper die radius can form a sharper bending angle, but it is also prone to excessive stretching of the material surface, leading to cracks or increased springback; while a larger radius can reduce springback and improve forming stability, but it may lead to an unsatisfactory bending angle, especially when processing high-strength or thick plate materials.
2. Improve the surface quality
A too small upper die radius is prone to produce indentation or surface damage at the bending location, especially for materials with high surface requirements, such as stainless steel, aluminum plate, etc. Reasonably selecting a larger radius helps to improve the appearance quality of the bent parts.
3. Affect the mold life
The upper die with a smaller radius bears greater stress concentration during use, which is prone to mold wear or崩角, affecting the service life. Therefore, it is beneficial to extend the mold life by appropriately selecting a larger radius under the premise of meeting the process requirements.
---
Two, Principles for selecting the upper die radius
1. Select according to the material thickness
The generally recommended upper die radius is 0.6 to 1.5 times the material thickness. For thin plate materials (such as materials with a thickness less than 1.5mm), a smaller radius can be selected; for medium and thick plates, the radius should be appropriately increased to prevent material cracking or mold damage.
2. Consider the mechanical properties of the material
Different materials have different ductility and strength. For example, for materials with poor ductility such as high-strength steel and stainless steel, a larger upper die radius should be selected to avoid cracking during the bending process.
3. Meet the bending angle and precision requirements
For workpieces that require high precision bending angles, it is usually recommended to use a smaller upper die radius to obtain a clearer bending line. However, for workpieces that require rounded corners, such as decorative parts or structural connecting parts, a larger radius can be chosen to meet the design requirements.
4. Refer to the lower die opening size
The upper die radius and the lower die opening size should be reasonably matched. Usually, the lower die opening size is about 8 times the upper die radius. If the upper die radius is not selected properly, it may affect the distribution of bending force and the forming quality of the workpiece.
---
Three, Matters needing attention in practical application
- During the trial molding stage, adjustments should be made in combination with the actual processing conditions, and different radius upper dies should be changed if necessary to find the best combination.
- Pay attention to the rolling direction of the material, avoid using an excessively small radius in the wrong direction of the material texture to prevent cracking.
- For complex shapes of bending, adaptability can be improved through multiple processes or the use of adjustable radius molds.
---
Conclusion
Choosing the appropriate upper die radius is an important link that cannot be ignored in the bending process. It not only affects the forming quality of the product, but also relates to the service life of the equipment and mold. In actual operation, various factors such as material properties, workpiece requirements, and equipment performance should be comprehensively considered to scientifically and reasonably select the upper die radius, thus achieving the goal of efficient and high-quality sheet metal bending processing.
During the sheet metal processing process, the bending machine is a very critical equipment, and its processing quality and efficiency largely depend on the selection of molds, especially the radius selection of the upper die (male die). The correct selection of the upper die radius is not only related to the accuracy of the bending angle and the surface quality, but also affects the occurrence of problems such as material springback and cracking. Therefore, it is crucial to scientifically and reasonably select the upper die radius in actual operation.
One, The influence of the upper die radius on the bending effect
1. Control the bending angle and springback
The upper die radius directly affects the bending angle and springback of the workpiece. Generally, a smaller upper die radius can form a sharper bending angle, but it is also prone to excessive stretching of the material surface, leading to cracks or increased springback; while a larger radius can reduce springback and improve forming stability, but it may lead to an unsatisfactory bending angle, especially when processing high-strength or thick plate materials.
2. Improve the surface quality
A too small upper die radius is prone to produce indentation or surface damage at the bending location, especially for materials with high surface requirements, such as stainless steel, aluminum plate, etc. Reasonably selecting a larger radius helps to improve the appearance quality of the bent parts.
3. Affect the mold life
The upper die with a smaller radius bears greater stress concentration during use, which is prone to mold wear or崩角, affecting the service life. Therefore, it is beneficial to extend the mold life by appropriately selecting a larger radius under the premise of meeting the process requirements.
---
Two, Principles for selecting the upper die radius
1. Select according to the material thickness
The generally recommended upper die radius is 0.6 to 1.5 times the material thickness. For thin plate materials (such as materials with a thickness less than 1.5mm), a smaller radius can be selected; for medium and thick plates, the radius should be appropriately increased to prevent material cracking or mold damage.
2. Consider the mechanical properties of the material
Different materials have different ductility and strength. For example, for materials with poor ductility such as high-strength steel and stainless steel, a larger upper die radius should be selected to avoid cracking during the bending process.
3. Meet the bending angle and precision requirements
For workpieces that require high precision bending angles, it is usually recommended to use a smaller upper die radius to obtain a clearer bending line. However, for workpieces that require rounded corners, such as decorative parts or structural connecting parts, a larger radius can be chosen to meet the design requirements.
4. Refer to the lower die opening size
The upper die radius and the lower die opening size should be reasonably matched. Usually, the lower die opening size is about 8 times the upper die radius. If the upper die radius is not selected properly, it may affect the distribution of bending force and the forming quality of the workpiece.
---
Three, Matters needing attention in practical application
- During the trial molding stage, adjustments should be made in combination with the actual processing conditions, and different radius upper dies should be changed if necessary to find the best combination.
- Pay attention to the rolling direction of the material, avoid using an excessively small radius in the wrong direction of the material texture to prevent cracking.
- For complex shapes of bending, adaptability can be improved through multiple processes or the use of adjustable radius molds.
---
Conclusion
Choosing the appropriate upper die radius is an important link that cannot be ignored in the bending process. It not only affects the forming quality of the product, but also relates to the service life of the equipment and mold. In actual operation, various factors such as material properties, workpiece requirements, and equipment performance should be comprehensively considered to scientifically and reasonably select the upper die radius, thus achieving the goal of efficient and high-quality sheet metal bending processing.
