German krausse springs krausse models krausse prices

krausse springs are energy accumulators; they have the function of storing energy but cannot release it slowly. To achieve slow release, this function should be realized by a "spring + high transmission ratio mechanism," commonly seen in mechanical watches. Helical springs have been applied for a very long time; ancient bows and crossbows are two types of helical springs in a broad sense. According to appearance, they can be divided into ordinary cylindrical helical springs and variable-diameter helical springs (see figure); according to the direction of the helix, they can be divided into left-hand springs and right-hand springs. Cylindrical helical springs have a simple structure, are easy to manufacture, and are the most widely used. Their characteristic line is linear, and they can serve as compression springs, extension springs, and torsion springs. When the load is large and the radial dimensions are limited, two compression springs with different diameters can be nested together to form a combination spring. Variable-diameter helical springs include conical helical springs, volute helical springs, and concave helical springs. Conical helical springs have good buffering performance and can withstand larger loads. Volute helical springs can store more energy and withstand larger loads, but the manufacturing process is relatively complex. The performance of concave helical springs is similar to that of conical helical springs, and they are mostly used in seat cushions and mattresses. The cross-sections of spring wire include circular and rectangular shapes, with circular cross-sections being the most commonly used.

krausse spring structure

The torsion bar spring itself is a torsion bar made of spring steel. The cross-section of the torsion bar is usually circular, with a few being tubular or rectangular. Its ends can be shaped as splines, square, hexagonal, or cylindrical with flat surfaces, so that one end is fixed to the frame and the other end is fixed to the swing arm of the suspension, which is connected to the wheel.

krausse spring measures to control springback

1) Select materials with good bending performance: Using materials with a low yield limit and high elastic modulus as bending parts can achieve higher bending quality. In addition, the magnitude of thickness tolerance of the blank, the surface quality, and the flatness have a significant impact on bending springback. For workpieces with high bending accuracy 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 of materials provided in references is mainly 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 depth of the die opening increases, and springback decreases as the die clearance decreases. For workpieces with high bending accuracy, the single-side bending clearance can be taken as Z = t; if higher bending accuracy 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, thereby 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 less springback than V-type parts. Complex workpiece shapes involve more mutual constraints between parts, making springback difficult to control. Therefore, ?-type springback is smaller than U-type. If suitable stiffening ribs are pressed at the bending area, the springback will be even smaller. Therefore, flanging or hemming treatment of bending parts can not only improve rigidity but also reduce springback. 5) Adopt appropriate microstructural states: Materials after cold working hardening have large bending springback. For bending parts with high accuracy requirements where the blank has cold working 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 of calibration bending is significantly smaller than that of free bending, and the greater the calibration force, the smaller the springback. 6) Calibrate the shape of the bending punch: This is because the calibration bending force concentrates the punching force in the bending deformation zone, forcing the inner layer of the metal to be compressed. After the sheet metal is calibrated, 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 amount of springback will be reduced, thereby achieving the goal of overcoming or reducing springback. Therefore, calibration bending is a bending method similar in nature to tensile bending, and its application range is broader. Generally, the shape shown in Figure 5 is mostly adopted for the calibration bending punch.

krausse spring features and applications

Features: Compared with ordinary compression or extension springs, its spring force is very constant, and it can output a nearly linear spring force, ensuring that the product does not change due to variations in spring force during use. In narrow and elongated spaces, it can minimize space usage as much as possible, increasing the possibilities for aesthetic product design. Constant force spring applications: Lift fans, LCD monitors, up-and-down sliding doors and windows, supermarket automatic checkout counters, motor carbon brush pressing devices, cables, stapler mainsprings, power tools, car ashtrays, locomotive carbon brush accessories, medical instruments, mobile phone holders, etc.

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