German fischer federn springs fischer federn models fischer federn prices

fischer federn springs are a new type of elastic component that uses high-pressure nitrogen as the working medium. They feature compact size, high spring force, long stroke, smooth operation, precision manufacturing, long service life (one million cycles), flat force-deflection curve, and no need for preloading. They perform tasks that are difficult for conventional elastic components such as metal springs, rubber, and air cushions, simplifying mold design and manufacturing, facilitating mold installation and adjustment, extending mold service life, and ensuring stable product quality. They can also be designed as a nitrogen spring system to operate as part of the mold, enabling constant pressure and delayed action within the system. They are the next-generation ideal elastic components with flexible performance.

fischer federn spring surface treatment

1) Blackening: This surface treatment provides a black surface; blackening prioritizes appearance over corrosion resistance. 2) Chrome plating: Chrome plating is mainly used for carbon steel products to increase corrosion resistance. 3) Oil impregnation: Oil impregnation is the standard treatment for carbon steel products to prevent rust during transportation and storage. 4) Passivation: Passivation is a cleaning method for stainless steel materials. 5) Phosphate coating: Phosphating offers better corrosion resistance than blackening. 6) Ultrasonic cleaning: This is the standard surface treatment for stainless steel materials. 7) Vibratory deburring: To remove sharp edges from the product.

fischer federn spring composition

Ring springs are compression springs composed of several inner and outer rings with tapered surfaces. Under axial load P, significant normal pressure is generated between the contact surfaces of the inner and outer rings, causing the inner ring diameter to decrease and the outer ring diameter to increase. Due to these changes in diameter, the spring shortens; when the external force is removed, the spring returns to its original dimensions under elastic internal forces because the ring taper angle b is greater than the friction angle. When ring springs bear axial P, significant friction is generated between the tapered contact surfaces of the inner and outer rings, dissipating considerable energy, while the relationship between force and deformation remains linear. During loading, the external force P equals the sum of the spring's internal elastic force and friction. ABO represents the unloading process, which includes two stages: the AB segment and the BO segment. The AB segment indicates the situation where the load decreases, and the spring's elastic internal force overcomes static friction, gradually restoring the spring to its original state. The inner and outer rings of ring springs are made of high-quality carbon steel or wear-resistant alloy steel. Each ring is roll-formed to the required shape to enhance load-bearing capacity, followed by heat treatment. Ring springs are heavy-duty springs with substantial buffering and shock-absorbing capabilities (the ratio of area OABO to OACO can reach 60~70%). They are commonly used in buffering devices for heavy vehicles, artillery, and aircraft landing gear.

fischer federn spring precautions

Due to product structure limitations, multi-strand springs generally feature high strength and good performance. The material must guarantee final performance in terms of spring strength and toughness. During the processing of multi-strand springs, note the following: 1 Support coils can be closed using either cold or hot closing methods as required by the product. When using hot closing, do not heat the spring until it sparks or turns white; the temperature for silicon-manganese steel must not exceed 850℃. Support coils must effectively contact active coils, and the gap must not exceed 10% of the nominal inter-coil gap. 2 The characteristics of multi-strand springs can be determined by adjusting the lead; the pitch can be adjusted as necessary during winding. The pitch can be 3~14 times the wire diameter, but 8~13 times is generally preferred. Spring force is closely related to free height, closed ends, outer diameter, and wire properties, and can be altered by adjusting one or more of these parameters. 3 Springs without support coils and springs with excessively fine wire diameters should not have welded ends, but the end cables must not be noticeably loose and must be deburred. For multi-strand springs requiring welded ends, the weld length should be less than 3 times the cable diameter (maximum 10 mm). The heated length should be less than one coil; polish smooth after welding, and perform local low-temperature annealing on the weld area during gas welding. 4 Surface treatment for springs generally involves phosphating, but other treatments are also possible. For zinc and cadmium plating, perform hydrogen embrittlement relief after electroplating. After hydrogen relief, sample 3% (no fewer than 3 pieces) for retesting and presetting; no fractures are allowed during retesting. Clean surface dirt, salt marks, and oxide scale from springs using sandblasting or gasoline cleaning; do not use acid pickling. 5 Important springs should be compressed for 24 hours; ordinary springs for 6 hours or compressed continuously 3~5 times, holding each time for 3~5 seconds. During compression, the gap between the spring and the mandrel should be 10% of the mandrel diameter; too small a gap makes operation difficult, while too large a gap may cause bending deformation. If one spring breaks during compression, the rest must be reprocessed.

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