Bending Articles

The bending technology area includes all manner of machines and processes for bending sheet metal, including press brakes, folders, panel benders, corner formers, ironworkers, notchers, orbital formers, and roll benders. It also has information on accessories such as gauging and backgauging systems.

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A grand unifying theory of press brake bending: Part II

October 28, 2015

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Radius bends—defined here as any bend with an inside radius greater than 125 percent of the material thickness—require careful calculation, not only because of their significant springback, but also because of the tooling these bends require. This includes the use of relieved dies.

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6 ways to boost press brake productivity

October 12, 2015

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Improved tool storage at the press brake, easier tool identification, fast tool loading/unloading (including heavy tools), and proper positioning of tooling in the press brake can make life easier for any press brake operator--experienced or not.

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Why automate your press brakes?

October 7, 2015

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Automated bending technology has changed significantly in recent years. Knowing which works best for your operation starts with a simple question: Why do you want to automate?

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A grand unifying theory of bending on the press brake: Part I

September 8, 2015

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Press brake guru Steve Benson proposes a new theory of bending, altering some long-held labels and definitions and introducing new formulas. Those long-held definitions worked well, but these new definitions and formulas may help a press brake technician become even more accurate in predicting how a part will form.

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Predicting the inside radius when bending with the press brake

August 12, 2015

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You can use some common rules of thumb to predict the inside bend radius when air forming, and the results you get are usually close enough, but with the help of a few online calculators, you can get even closer.

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Peace of mind with single-piece flow

August 4, 2015

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The Minneapolis manufacturing facility for Unison Comfort Technologies was being stretched to the limits trying to keep up with orders for its HVAC products. New fabricating technology was seen as the only way to meet current production needs and add capacity, but the company needed a new approach to its part flow as well if it were to make the most of any reshuffling of the shop floor.

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8 questions for efficient bending on the press brake

July 27, 2015

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At S&B Machine in Mobile, Ala., Head Programmer Danny Brown streamlines bending by making sure the right operators have the right information at the right time.

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How to calculate the air-formed radius of different bend angles

July 21, 2015

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Using the 20 percent rule works well when calculating the floated radius in an air form, but what about the radius at different bend angles? To calculate this, we start with geometry to find the arc length and radius at different bend angles. We then manipulate these results by factoring in real-world bending conditions.

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Horizontal bending on the press brake

July 15, 2015

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With the right tooling, you can accomplish horizontal bending—that is, where the sheet remains horizontal during the bend cycle—on the press brake. In general, horizontal bending on the press brake is accomplished with either wiping tools or rotary-style tools.

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Forming aluminum on the press brake: Bending soft, not sharp

June 29, 2015

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Air bending soft aluminum has such a low tensile strength that it doesn't take much for a narrow punch tip to penetrate the surface and turn the bend sharp.

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Employees set the pace for success

June 25, 2015

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Wisconsin Metal Parts Inc., Waukesha, Wis., has grown its metal fabricating business very aggressively in recent years. The latest machine tool technology has helped, but its employees have made it stay in control and on course.

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Precision sheet metal bending, bump by bump

June 1, 2015

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Bump bending remains more art than science, especially for large and thick workpieces, but using the right tools and setup procedures help make this challenging brake operation much more efficient.

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Bending and brewing

May 11, 2015

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Sheet metal worker Paul Ziegman puts in long days building stainless steel kitchen equipment for restaurants and other food-service businesses in and around Spokane, Wash. He recently opened his own such business using the same equipment and skill set.

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The 4 pillars of press brake tonnage limits

May 3, 2015

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To ensure you always work within the tonnage limits of your press brake and tooling, first calculate how much tonnage you need. Second, identify your tooling’s load limits. Third, calculate the sinking tonnage limit, which, if exceeded, can embed tooling into the ram or bed. Fourth, determine your press brakes’ centerline load limit.

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How an air bend turns sharp

April 30, 2015

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Why do air bends in cold-rolled steel turn sharp at an inside radius that’s about 63 percent the material thickness? It has to do with the relationship between forming forces and a material’s tensile and yield strength.

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