German halder springs, halder models, halder prices

halder springs are conical disc-shaped and can be used individually or in series or parallel combinations. They withstand static or dynamic axial loads at the upper inner edge and lower outer edge, deforming under compression until flattened to store energy as a live load. When necessary, they automatically convert into additional compressive loads required for sealing, reducing the continuous tightening requirements for gaskets and packing materials. Disc springs are special springs that are conical in the axial direction and bear loads. After deformation under load, they store potential energy. When bolts loosen, the disc spring releases part of the potential energy to maintain pressure between flange connections to meet sealing requirements. The stress distribution of disc springs decreases uniformly from the inside out, achieving high compensation force with low stroke.

halder spring applications

Wire compression springs are used in all types of applications, from home appliances to motorized equipment and motors, as they are the required spring type. Compressed by loads acting on them or their ends, the design of compression springs attempts to return the spring to its original shape, thereby pushing back against the load. Main application areas: medical respiratory equipment, medical mobile devices, hand tools, home care equipment, shock absorption, and engine valve springs.

halder spring rebound control measures

1) Select materials with good bending performance: Using materials with a low yield limit and a 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 set to 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 bent parts have less springback than V type parts. Complex workpiece shapes involve more mutual constraints between parts, making springback difficult to control. Therefore, ? type has less springback 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 bent parts can not only improve stiffness but also reduce springback. 5) Adopt appropriate microstructural states: Materials after cold working hardening have large bending springback. For bent parts with high accuracy requirements, if the blank has cold working hardening, it should be annealed before bending. Where necessary and permissible, heating bending should be used 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 wider. Generally, the shape shown in Figure 5 is mostly used for the punch in calibration bending.

halder spring classification

1) ISO International Standard Type: ISO gas springs are the most common typical type of gas springs, with all technical parameters complying with the ISO11901 international standard for gas springs and China's national standards; B type gas springs also comply with the gas spring standards of companies such as FORD-WDX3560 (Ford), GM-M-150 (General Motors), and Renault (Renault). 2) Compact Structure Type: The compact structure type is also called J type gas spring, which is one of the product series of gas springs, fully named J type compact structure gas spring. J type compact structure gas spring is a type popular among mold designers. Compared with the B series gas springs, it has a shorter cylinder base length, thus a shorter total length, which can reduce the design height of the mold, making it one of the preferred varieties of gas springs for molds. 3) Ultra-compact Type: It is the model with the shortest base length among gas springs worldwide. At the same time, its outer diameter is one grade smaller than other types of gas springs (except T type extra-slim structure type), but the piston rod diameter is the same, so it is small in size but powerful. C type gas springs perform no worse than ISO standard type gas springs in all aspects when the working stroke requirement is not too long. 4) Extra-slim Structure Type: It is the most compact type of gas spring in terms of cylinder diameter, featuring piston sealing, with an outer diameter even smaller than the ultra-compact type. The working stroke of the H type gas spring series generally does not exceed 50mm, and its performance in all aspects is no worse than that of C type gas springs.

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