The Ultimate Solution to Bending Interference
Bendmax Custom Window Punch Enables Seamless Forming of Deep U-Shaped Parts
The customer was using standard press brake tooling. Due to the large overall dimensions and high side walls of the workpiece, conventional upper and lower tooling could not provide sufficient clearance, making interference unavoidable.
As a first, quick solution, the Bendmax engineering team suggested reversing the left and right segmented sections of the upper punch, creating a clearance gap in the center. This allowed the workpiece to pass through the middle space during bending, reducing the risk of collision between the punch and the part.
After installing the segmented punch and performing trial bends, the customer found that, because of the large part size and deep bending depth, the available clearance was still insufficient. The interference problem could not be fully eliminated.
Following a detailed analysis of the part geometry, bending sequence, bending path, and press brake configuration, Bendmax engineers recommended a more professional and reliable solution: a custom Window Punch (clearance punch / open-window punch).
The Window Punch features a large central opening, with the window size fully customizable. This design allows oversized, deep U-shaped, or box-type workpieces to pass through the punch during bending, effectively eliminating bending interference between the tooling and the part. At the same time, the Window Punch remains highly compatible with the customer’s existing press brake and can still be used for other non-interfering bending operations.
The customer accepted our recommendation and ordered a custom Window Punch with a window size specifically designed for their workpiece.
The bending display of the window tool
Once the Window Punch arrived at the customer’s factory in Brazil, it was quickly put into production. The results were excellent. According to customer feedback, bending interference was completely eliminated, all bending sequences could be completed smoothly, and complex deep U-shaped parts could be formed in a single setup.
The customer highly recognized this professional press brake tooling solution, and the Window Punch has since become a key tool for processing large structural components in their production.
Window tool in hardness testing
· Enhanced corrosion resistance by forming a protective oxide layer
· Reduced surface reflectivity, improving operational visibility
· Improved wear resistance, extending mold service life
· Uniform and professional appearance with minimal dimensional change
With extensive industry experience and strong customization capabilities, Bendmax successfully solved a bending interference problem that conventional tooling could not handle. By using a custom Window Punch, the customer not only restored stable production but also significantly improved bending efficiency and forming capability—once again demonstrating Bendmax’s expertise in high-difficulty press brake tooling solutions for global customers.
We offer a wide range of window tool options to meet your needs, and customization is available upon request
Phone: (0086)-15002165198
Email: jason@bendmax.com
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