Bending dies for press brakes include several types such as L-type, R-type, U-type, Z-type, etc. The upper die has different angles, including 90°, 88°, 45°, 30°, 20°, 15°, etc. The lower die consists of double-slot and single-slot options with different slot widths ranging from 4 to 18V. Additionally, there are R-type lower dies, acute angle lower dies, and flattening dies. The upper and lower dies can be segmented or solid. The segmented upper die is typically divided into sections of 300mm, 200mm, 100mm, 100mm, 50mm, 40mm, 20mm, 15mm, and 10mm, while the solid upper die measures 835mm in length. The lower die is generally divided into sections of 400mm, 200mm, 100mm, 50mm, 40mm, 20mm, 15mm, and 10mm, with the solid length also being 835mm.
① Bending dies are made of high-quality steel and undergo special heat treatment, resulting in high hardness, low wear, and the ability to withstand high pressure. However, each set of dies has a limit to the pressure it can endure, measured in tons per meter. Therefore, it is crucial to select the appropriate die length based on the pressure required per meter, ensuring it does not exceed the specified pressure limit.
② To prevent damage to the dies, it is necessary to use upper and lower dies with a length of at least 300mm when setting the origin point. Only after setting the origin point correctly can the same height upper and lower dies be used. It is strictly prohibited to use segmented smaller dies for setting the origin point, and the standard for setting the origin point should follow the internal origin pressure specified by the AMADA machine.
③ Due to the varying heights of different dies, when using dies on a single machine, only dies with the same height should be used. It is not recommended to use dies with different heights.
④ When using dies, it is important to select suitable upper and lower dies based on the material hardness, thickness, and length of the metal sheet. Generally, the lower die is selected based on a standard of 5-6 times the thickness and should be slightly longer than the sheet. For harder materials or thicker sheets, a wider lower die slot should be used.
⑤ When bending sharp angles or forming dead corners, a 30-degree upper die should be selected. Sharp angles should be bent first, followed by forming the dead edge. When bending R angles, R-type upper and lower dies should be used.
⑥ When bending longer workpieces, it is preferable to avoid using segmented dies to reduce the appearance of knife marks. Single-slot dies are recommended because they have a larger outer corner R in the V-groove of the lower die, reducing the occurrence of bending marks.
⑦ When selecting the upper die, it is necessary to understand the parameters of all the dies and then decide which one to use based on the desired shape of the product being formed.
⑧ When bending extremely hard materials or excessively thick sheets, dies should not be used to bend steel bars or other cylindrical products.
⑨ When using dies, it is important to stay focused. After the machine has set the origin point, the upper and lower dies should be locked to prevent them from falling and causing injury or damage to the dies. During the operation, attention should be paid to applying pressure, avoiding sudden excessive force. It is important to monitor the changes in the displayed data on the screen.
⑩ After using the dies, they should be promptly returned to the die rack and stored according to the markings. Regularly clean the dust from the dies and apply rust preventive oil to prevent rusting and maintain die accuracy.
