L: expanded length of sheet metal.

R: the inner diameter of the elbow.

T: material thickness.

θ: Bending angle.

Y coefficient: a constant determined by the position of the nerve bending line, with a default value of 0.5 (so-called "bending line"). Its default value, initial_bend_factor, can be set in config.

Extended data:

Sheet metal processing is called sheet metal processing. Specifically, such as making chimneys, iron drums, oil tanks, oil pots, ventilation pipes, elbows, round places, funnels, etc. Through the use of plates, the main processes are cutting, bending, forming, welding, riveting and so on. This requires a certain knowledge of geometry.

Sheet metal parts are sheet metal parts, that is, parts that can be processed by stamping, bending and stretching. The general definition is a part with constant thickness during machining. Corresponding parts include casting parts, forging parts, machining parts, etc. For example, the iron shell outside the car is a sheet metal part, and some cabinets made of stainless steel are also sheet metal parts.

Modern sheet metal processes include filament winding, laser cutting, rework, metal bonding, metal stretching, plasma cutting, precision welding, roll forming, sheet metal bending forming, die forging, water jet cutting, precision welding and so on.

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