53/5/1 spring Germany durovis model 53/5/1 price

53/5/1 spring is a mechanical energy storage structure, mainly used in ancient ballistae and other crossbows. 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 launched object. Modern torsion spring torsion bars are mostly made of steel with good elasticity, and their forms have varied greatly, including hairsprings in mechanical watches, power springs in toy gyro guns, and torsion bars in tanks and automobiles. Torsion bars are small in volume but provide high torque, making them excellent shock absorbers for transportation vehicles. Torsion spring torsion bars are mostly made of steel with good elasticity, and their forms have varied greatly, including hairsprings in mechanical watches, power springs in toy gyro guns, and torsion bars in tanks and automobiles.

53/5/1 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: (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 the larger the bending center angle α, the larger the springback angle; (4) die clearance Z. The larger the clearance between the punch and die, the greater the springback amount; (5) bending method. Free bending has a large springback amount, corrected bending has a smaller springback amount, and full-form upsetting correction bending has the smallest springback amount; (6) workpiece shape and material microstructure state. Complex shapes with more mutual constraints have smaller springback amounts, while cold-work hardened materials have larger springback amounts; (7) die structure and blank holder force magnitude. A larger blank holder force results in a smaller springback amount after bending the workpiece.

53/5/1 spring measures to control springback

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 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 radius given in data is 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, the springback decreases as the die opening depth increases, and the springback amount decreases as the die clearance decreases. For workpieces with high bending precision, the single-side bending clearance value can be taken as 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 it from ordinary bending to 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 bending parts have smaller springback amounts than V type parts. Workpieces with complex shapes have more mutual constraints between parts, making springback difficult. Therefore, the springback amount of ? type is smaller than that of U type. If suitable reinforcing ribs are pressed at the bending area, the springback amount will be even smaller. Therefore, flanging or hemming treatment of bending parts can not only improve stiffness but also reduce springback. 5) Adopt suitable microstructure states: Materials after cold work hardening have large bending springback amounts. For bending parts with high precision requirements whose blanks have cold work hardening, they should be annealed before bending. Where necessary and permissible, heating bending should be adopted for workpieces with thicker blanks to eliminate springback. The springback angle of corrected bending is significantly smaller than that of free bending, and the greater the correction force, the smaller the springback. 6) Correct the punch shape for bending: This is because the corrected bending force will concentrate the punching force in the bending deformation zone, forcing the inner metal 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 wider. Generally, the punch for corrected bending mostly adopts the shape shown in Figure 5.

53/5/1 spring compensation method for controlling springback

The compensation method for controlling springback involves controlling the geometric shape and dimensions of the working part of the die based on the direction and magnitude of the springback of the bending part, so that the springback after bending the workpiece is compensated. For example, for U shaped parts with large bending, the end face of the punch or the surface of the ejector plate can be made into an arc shape, or the punch and die can be made into inclined surfaces at a certain angle, so that the deformation generated at the bent arc or inclined area during unloading can compensate for the springback deformation of the two corners. Extending from this, the bending compensation method can be used to bend workpieces that are difficult to bend using conventional methods. For the shape shown in Figure 8, the two sides are tightly closed with no forming space. Using the methods of deformation springback and correction compensation, bending can be achieved.

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