Having worked with press brake machines extensively, I found that bending errors at 135 degrees are common, but fixable. One key factor is the programming of the lower die radius and correction angles. It’s not just about the machine’s hardware—software parameters like '校正a1' and '校正a2' (correction angles) need careful calibration. For example, using the JFY lower die V12 and adjusting the correction from 0.00mm to around 0.2mm can correct the deviation from 135° to exactly 135°. Also, synchronizing bending steps and ensuring your delay times and step repetitions are set properly can help maintain angle consistency. From my experience, manually checking the bend angle after the first try and editing the die radius settings in your software (changing from 12mm to 20mm as needed) significantly improves accuracy. Don’t overlook the safety distance (安全距离 SN) settings either—they influence the material’s movement during bending. Measuring bend angles right after the process using a reliable angle gauge and adjusting 'a1' and 'a2' correction values dynamically based on feedback has been a game changer for me. This practice helps ensure that even at challenging angles like 135°, the bends remain precise and repeatable. Overall, bending accuracy at intermediate angles hinges on a combination of precise tooling selection, careful machine programming, and real-time corrections. Taking the time to understand and adjust these parameters transforms your bending results from approximate to perfect.