Currently, high-strength steel plates mainly include WELDOX high-strength structural steel and HARDOX wear-resistant steel. Compared to ordinary carbon steel and stainless steel plates, high-strength plates have advantages such as high strength, high hardness, light weight, and are becoming increasingly popular in industries such as automotive, large ships, pressure vessels, and engineering where material performance requirements are high.
Bending high-strength steel plates and steel plates has rarely been proven to be difficult. However, there are some issues that must be considered, which this article will address.
What should be done before bending high-strength steel?
1) Check the quality of the cut plate.
Surface damage to high-strength plate can affect the bending effect and may lead to plate breakage. For thick plates, scratches and rust defects on the plate can usually be removed by careful grinding. It is best to place the grinding scratches perpendicular to the bending line rather than parallel to it. Burrs and cutting residues generated during plate cutting can also damage the plate and bending dies, so they should be deburred and rounded with a grinder.
2) Check the rolling direction of the plate.
If possible, orient the rolling direction perpendicular to the bending line. This ensures better bending results and reduces the risk of damage to the plate.
3) Check the bending dies.
Carefully inspect the condition of the bending dies to ensure they are not damaged. The hardness at the upper die tip and lower die groove should be higher than that of the plate. Additionally, the upper and lower dies should be aligned at the center.
What should be considered when bending high-strength steel?
1) Pay attention to safety and follow the bending machine's safety instructions. Only authorized personnel should be allowed near the machine. No one should stand in front of the bending machine when bending high-strength steel.
2) Check if the upper die tip can touch the bottom of the lower die groove.
3) Consider springback. High-strength plates have greater springback compared to ordinary carbon steel plates, so it is important to accurately calculate the springback coefficient, set the appropriate bending angle, and avoid re-bending to correct angles.
4) Tonnage. Due to the higher hardness and strength of high-strength plates, bending requires a larger tonnage. Therefore, when bending, calculate the bending tonnage based on the plate thickness and bending length to avoid insufficient tonnage or overloading.
