Bending Technology-Jiangsu Lingwei CNC Machine Tool Co., Ltd.

Control Every Bend, from Flat Sheet to Finished Part

Sheet metal bending transforms flat material into parts with defined angles, radii and profiles. The real challenge is not producing a single qualified part, but maintaining stable angles, dimensions and forming consistency across repeated production.
Leadway combines press brake engineering, servo control, CNC programming, crowning compensation and tooling technology to support precision parts, heavy plates, long workpieces and automated bending production.

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Jiangsu Lingwei CNC Machine Tool Co., Ltd.

Air Bending
In air bending, the sheet is supported by both shoulders of the lower die but does not fully contact its inner surfaces. The punch controls the angle by moving to a calculated depth.A deeper punch position produces a smaller angle. Since different angles can be formed using the same punch and die, air bending provides high process flexibility and is widely used for multi-product sheet metal production.
Bottom Bending
In bottom bending, the punch presses the sheet completely into the lower die so that the material closely follows the punch and die geometry. The final profile is therefore determined more directly by the tooling.Compared with air bending, bottom bending normally requires higher forming force and more closely matched tools. The increased pressure helps stabilize the angle and reduce material springback.
Folding and Hemming
Folding and hemming are normally completed in two stages. The sheet edge is first pre-bent and then repositioned for the second forming step.If a controlled gap remains between the two surfaces, the result is a folded edge. If both surfaces are pressed completely together, the result is a hemmed edge.

Technologies Behind Stable Bending

01

Closed-Loop Ram Synchronization

The left and right sides of the ram must remain synchronized throughout the bending cycle. Leadway UPB press brakes use closed-loop electro-hydraulic servo control to regulate the Y1 and Y2 axes and maintain stable ram movement.
02

Crowning Compensation

Under bending load, the ram and worktable may deform slightly, causing angle variation along long workpieces. Mechanical or hydraulic crowning applies compensation across the bending length to reduce this difference.
03

CNC Programming and Backgauge Positioning

Depending on the selected control system, Leadway press brakes can support graphical programming, automatic bend-sequence calculation, tool libraries, angle correction and collision detection. Multi-axis backgauges provide accurate positioning for different flange dimensions, part heights and asymmetric workpieces.
04

Tooling and Fast Changeovers

Tooling directly affects the internal radius, minimum flange size, required bending force and final profile. Leadway can configure segmented tooling, single-V and multi-V dies, large-radius tools, hemming tools and quick-clamping systems according to the workpiece.

Discuss Your Bending Application

Send your workpiece drawing and production information to Leadway. Our engineers will review the material, thickness, bend length, profile, tolerance and production requirements and recommend a suitable bending process and equipment configuration.

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