German fastbox spring fastbox model fastbox price

fastbox spring is a new type of elastic component that uses high-pressure nitrogen as the working medium. It features compact size, high spring force, long stroke, smooth operation, precision manufacturing, long service life (one million cycles), flat force curve, and no need for preloading. It performs tasks that are difficult for conventional elastic components such as metal springs, rubber, and air cushions. It simplifies mold design and manufacturing, facilitates mold installation and adjustment, extends mold service life, ensures stable product quality, and can be designed as a nitrogen spring system to operate as part of the mold. It allows easy implementation of constant pressure and delayed action within the system, making it an ideal new-generation elastic component with flexible performance.

fastbox spring classification

1) Based on different load characteristics during operation, helical springs can be divided into compression, extension, and torsion types; 2) Based on structural features, they can be divided into two main categories: cylindrical helical springs and variable-diameter helical springs; variable-diameter helical springs mainly bear compressive loads; 3) Based on shape features, they can be divided into conical, volute, concave, and convex shapes. 4) In terms of production and use, helical springs can also be divided into large helical springs and small helical springs based on forming methods and material diameter; the former are usually hot-formed, while the latter are cold-formed. 5) Other classifications: There are many types of helical springs. By appearance, they can be divided into ordinary cylindrical helical springs and variable-diameter helical springs. By helix direction, they can be divided into left-hand springs and right-hand springs. Variable-diameter helical springs include conical helical springs, volute helical springs, and concave helical springs. Cylindrical helical springs have a simple structure, are easy to manufacture, and are widely used. Their characteristic line is linear, allowing them to serve as compression, extension, and torsion springs. When the load is large and radial dimensions are limited, two compression springs with different diameters can be nested together to form a combination spring.

fastbox 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 quality of the surface finish, and the flatness all 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 for 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 set to Z = t; if higher bending accuracy is required, adopting bending with slight thinning is more effective in reducing springback. This is 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 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 bent parts exhibit less springback than V-type parts. Complex workpiece shapes involve significant mutual constraint between various parts, making springback difficult to control. Therefore, ?-type springback is smaller than U-type. If suitable stiffening ribs are pressed at the bending area, 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 microstructural states: Materials after cold working hardening exhibit large bending springback. For bent parts with high accuracy requirements where the blank has undergone cold working hardening, annealing treatment should be performed before bending. Where necessary and permissible, heating during bending should be adopted for workpieces with thicker blanks to eliminate springback. The springback angle in calibration bending is significantly smaller than in free bending, and the greater the calibration force, the smaller the springback. 6) Calibrate the punch shape for bending: This is because the calibration bending force concentrates the punching force in the bending deformation zone, forcing the inner metal layer 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 appears to be broader. Generally, the punch for calibration bending mostly adopts the shape shown in Figure 5.

fastbox 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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