{"id":25425,"date":"2026-08-03T19:50:17","date_gmt":"2026-08-04T03:50:17","guid":{"rendered":"https:\/\/shengenfab.com\/?p=25425"},"modified":"2026-08-03T20:07:42","modified_gmt":"2026-08-04T04:07:42","slug":"sheet-metal-bend-reliefs","status":"publish","type":"post","link":"https:\/\/shengenfab.com\/ko\/sheet-metal-bend-reliefs\/","title":{"rendered":"\ud310\uae08 \uad7d\ud798 \uc5ec\uc720: \ud06c\uae30, \ud615\uc0c1 \ubc0f DFM \uaddc\uce59"},"content":{"rendered":"\t\t
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A sheet metal bend relief is a small notch cut at the end of a bend line to separate the bent material from the adjacent flat surface. This physical gap prevents the metal from tearing, bulging, or cracking during the press brake forming process.<\/p>

Despite its simplicity, the bend relief is one of the most frequently mishandled features in sheet metal design. Relying on the default settings in SolidWorks or Fusion 360 often leads to shallow reliefs that cause tearing on the shop floor, resulting in scrapped parts and production delays.<\/p>

To bridge the gap between CAD modeling and real-world manufacturing, this guide breaks down the exact sizing formulas for bend reliefs, the constraints of different materials, and the DFM (Design for Manufacturing) rules you need to guarantee a clean, cost-effective corner on the press brake.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Where Bend Reliefs Are Actually Needed<\/h2>

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Bending sheet metal<\/a> introduces severe localized stress. Understanding where and why this stress causes damage helps designers determine when a bend relief is necessary, rather than applying them blindly to every flange.<\/p>

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Material Flow at the Bend End<\/h3>

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During the bending process, the outer surface of the sheet metal stretches while the inner surface compresses. If a bend zone sits directly next to a flat, unbent plane, that static material restricts the natural deformation of the bend.<\/p>

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The compressed material at the inside radius pushes outward. Without physical separation, this displacement forces the edge of the bend to tear, bulge, or pull the adjacent flat surface out of alignment\u2014often turning an otherwise finished part into scrap. A bend relief isolates the bend zone, ensuring that material deformation ends at a controlled, engineered point.<\/p>

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Full-Width, Partial, and Intersecting Bends<\/h3>

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The necessity of a bend relief depends entirely on the geometry of the flange relative to the surrounding sheet metal.<\/p>

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A full-width bend, which extends completely across a side of a part, generally does not require a relief because there is no adjacent unbent material to restrict forming. A partial bend requires a relief at its termination point to stop tearing. A contained bend\u2014a flange positioned within the interior of a sheet\u2014requires reliefs at both ends. When two distinct flanges intersect at a corner, designers must account for a corner relief rather than a simple single-bend relief.<\/p>

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