Incremental Sheet Metal Forming from Both Sides for Complex Shapes

Simple SummaryContent extracted from patent full text and abstract with AI.

This invention is a method and device for incrementally forming flat structures into metal sheets without causing unwanted warping or distortion. A sheet is clamped around its edges between two template plates, and a forming tool (such as a punch mandrel or roller) first presses a shallow structure into the top surface of the sheet. The sheet is then flipped — ideally while still clamped to prevent stress release — and the same or a second tool partially pushes the structure back from the underside. This two-sided sequential forming balances the internal stresses on both faces of the sheet, so that when the finished part is released from the clamp it remains flat rather than curving or buckling.

Use CasesContent extracted from patent full text and abstract with AI.

• Manufacturing decorative metal wall cladding, facade panels, and ceiling tiles with custom embossed patterns that must remain flat after production.
• Producing prototype metallic bipolar plates for fuel cells or plate heat exchangers with precise flow-channel structures in thin sheet metal.
• Creating stiffening beads or ribs in thin sheet-metal components (e.g., appliance panels, enclosures) to increase rigidity without distorting the overall flatness.
• Fabricating individualized signage, logos, or house-number plates embossed into thin metal sheets in small batch or one-off quantities.
• Making structured drainage surfaces or shelf insets for stainless-steel sinks and kitchen equipment where flatness and surface pattern are both required.
• Forming shallow structured patterns into thin metal sheets on standard 3-axis CNC milling machines or industrial robots without dedicated stamping dies.

BenefitsContent extracted from patent full text and abstract with AI.

• Eliminates or greatly reduces post-forming geometric distortion (warping) in thin sheet metal parts, which has been the primary obstacle to industrial adoption of incremental sheet forming for flat structures.
• Removes the need for expensive, geometry-specific stamping dies, making the process economically viable for small batches and custom or one-off designs.
• Allows the same forming tool to perform both the initial forming and the back-forming step, minimising tooling investment and machine complexity.
• Keeping the sheet clamped during the flip prevents premature stress release, ensuring the stress-balancing back-forming step is fully effective.
• Supports a wide range of structure geometries — open lines, closed pockets, beads, offsets — using a single universal mandrel or roller tool guided by CNC path data.
• Applicable as a retrofit correction step after conventional single-stage stamping (hollow embossing), extending distortion control to existing production processes.

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Patent Abstract

The invention relates to a method for forming a sheet metal (3), wherein the sheet metal (3) has a top side (3a) and a bottom side (3b) and is clamped on the peripheral side, characterized in that a structure is introduced into the sheet metal (3) by means of sequential bilateral processing from the direction of the top side (3a) and the bottom side (3b) by means of a forming tool. The device comprises a clamping device for peripheral clamping of a sheet metal (3) and a forming tool for sequential bilateral processing of the sheet metal (3) from the direction of a top side (3a) and a bottom side (3b).