German scheuenstuhl springs scheuenstuhl models scheuenstuhl prices

scheuenstuhl springs are mechanical energy storage structures, primarily used in ancient ballistae and other crossbow-type weapons. Torsion springs store energy by twisting or rotating elastic materials with soft texture and high toughness, thereby imparting a certain amount of mechanical energy to the projectile. Modern torsion spring torque bars are mostly made of steel with good elasticity, and their forms have varied greatly; examples include the hairsprings in mechanical watches, the power springs in toy gyro guns, and the torque bars in tanks and automobiles. Torque bars are compact yet deliver high torque, making them ideal as shock absorption components for transportation vehicles. Torsion spring torque bars are mostly made of steel with good elasticity, and their forms have varied greatly; examples include the hairsprings in mechanical watches, the power springs in toy gyro guns, and the torque bars in tanks and automobiles.

scheuenstuhl spring influencing factors

Springback includes angular springback and curvature springback, which is the result of the combined effect of springback in the bending deformation zone and the non-deformation zone. There are many factors affecting springback, mainly including: (1) material mechanical properties σs, Eoσs the higher the value, the smaller the E value, the greater the bending springback; (2) degree of deformation r/t. Under the same conditions, the angular springback amount increases as the r/t value increases; the curvature springback amount decreases as the r/t value increases; (3) bending center angle α o a larger bending center angle α results in a larger springback angle; (4) die clearance Z. Larger clearance between the punch and die results in greater springback; (5) bending method. Free bending has large springback, corrected bending has smaller springback, and full-form upsetting bending has the smallest springback; (6) workpiece shape and material microstructure state. Complex shapes with more mutual constraints result in smaller springback, while springback is greater after work hardening; (7) die structure and blank holder force magnitude. Greater blank holder force results in smaller springback after bending the workpiece.

scheuenstuhl spring springback control measures

1) Select materials with good bending performance: Using materials with low yield limit and high elastic modulus as bending parts can achieve higher bending quality. In addition, the thickness tolerance of the blank, surface quality, and flatness all have a significant impact on bending springback. For workpieces with high bending precision requirements, the quality of the blank in these aspects should also be screened. 2) Select a smaller relative bending radius: A small r/t value indicates a large degree of deformation. Generally, when r/t ≤ 3-5, it is considered that the bending zone of the sheet metal has fully entered the plastic state. A smaller bending radius is beneficial for reducing springback, but an excessively small bending radius may cause cracking in the bending zone. The minimum bending radii for materials provided in references are mainly absolute empirical data, which can serve as a reference for sheet metal designers when designing the bending radius of workpieces. 3) Select the required die clearance: For V type bending, the clearance value is achieved by high-speed machine tools and is independent of the die itself. For U type bending, springback decreases as the die opening depth increases, and springback decreases as the die clearance decreases. For workpieces with high bending precision, the single-side bending clearance can be set to Z = t; if higher bending precision is required, adopting bending with slight thinning is more effective in reducing springback. Because zero or negative clearance bending can change the stress state of the sheet metal, transforming ordinary bending into bending with tensile-bending characteristics, creating a compressive stress state on the inner side of the neutral layer of the blank, so that the entire cross-section of the blank is in a tensile stress state in the tangential direction. After unloading, the springback of the inner and outer fibers cancels each other out, reducing springback (Figure 4). Therefore, adopting tensile-bending processes and dies with adjustable clearance is very beneficial for controlling springback. 4) Design reasonable workpiece shapes: U type bent parts have less springback than V type parts. Complex workpiece shapes with more mutual constraints between parts make springback difficult to control. Therefore, ? type springback is smaller than U type. If suitable stiffening ribs are pressed at the bending location, the springback will be even smaller. Therefore, flanging or hemming treatment of bent parts can not only improve stiffness but also reduce springback. 5) Adopt appropriate microstructure states: Materials after work hardening have large bending springback. For bending parts with high precision requirements where the blank has work hardening, annealing treatment should be performed before bending. Where necessary and permissible, heating bending should be adopted for workpieces with thicker blanks to eliminate springback. The springback angle in corrected bending is significantly smaller than in free bending, and the greater the correcting force, the smaller the springback. 6) Correct the punch shape for bending: This is because the correcting bending force concentrates the punching force in the bending deformation zone, forcing the inner metal layer to be compressed. After the sheet metal is corrected, both the inner and outer fibers are elongated and will shorten after unloading. Since the springback trends of the inner and outer layers are opposite, the springback amount will be reduced, thereby achieving the goal of overcoming or reducing springback. Therefore, corrected bending is a bending method similar in nature to tensile bending, and its application range appears to be broader. Generally, the punch for corrected bending mostly adopts the shape shown in Figure 5.

scheuenstuhl spring applications

1) For blacksmiths: Because leaf springs are made of higher quality steel, they are a favorite material for blacksmiths. In countries such as Nepal, Bangladesh, the Philippines, and Pakistan, where traditional blacksmiths still produce a large number of tools, leaf springs from scrapped cars are often used to make tools such as knives. 2) Used in trampolines: Leaf springs have also replaced traditional coil springs in some trampolines (known as soft-edge trampolines), which improves user safety and reduces the risk of concussion. Leaf springs are spaced around the frame 'legs', branching from the base frame to suspend the jumping mat, thereby providing elasticity. 3) Used in clutches: The 'diaphragm' commonly found in automotive clutches is a type of leaf spring.

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