German stafea springs, stafea models, stafea prices

stafea springs are a special type of extension spring, suitable for applications with large elongation and non-increasing load. Constant-force springs consist of spiral metal strips; the inner side of the strip is curved so that each turn wraps tightly around the inner turn. When the metal strip is stretched (twisted), internal stress resists the load force, exactly like a standard extension spring, but the spring rate is nearly constant (zero). See the load/torque diagram. In use, an ID is typically used to wind this spring tightly onto a drum, with its free end connected to the load, acting like a counterweight. Alternatively, the free end can be fixed, allowing the spring itself to provide the working force, similar to carbon brushes in electrical devices.

Factors affecting stafea springs

Springback includes angular springback and curvature springback, resulting from the combined effect of springback in the bending deformation zone and the non-deformation zone. Many factors influence springback, mainly: (1) mechanical properties of the material σs, Eoσs; the higher the value, the smaller the E value, and the greater the bending springback; (2) degree of deformation r/t. Under identical conditions, angular springback increases as the r/t value increases; curvature springback decreases as the r/t value increases; (3) bending center angle αo; a larger bending center angle α results in a larger springback angle; (4) die clearance Z. Larger clearance between the punch and die results in greater springback; (5) bending method. Free bending results in large springback, corrected bending results in smaller springback, and full-form upsetting calibration results in the smallest springback; (6) workpiece shape and material microstructure state. Complex shapes with more mutual constraint result in less springback, while cold work hardening results in greater springback; (7) die structure and magnitude of blankholder force. Higher blankholder force results in less springback after bending.

stafea spring materials

Disc springs are mostly manufactured from cold-rolled or hot-rolled strip steel, sheet metal, or forged blanks (forging ratio not less than 3). Common materials include spring steels such as 60S2MA and 50CVA. For thicknesses less than 1.1, high-carbon steel may also be used. Performance requirements for disc spring materials dictate that after heat treatment, they must possess high ultimate strength, yield strength, elastic limit, and fatigue limit, while also requiring high impact toughness, plasticity, and the highest possible yield-to-tensile ratio. To meet these performance criteria, high-quality cold-rolled or hot-rolled steel strips or sheets are widely used domestically and internationally. For disc springs with thickness greater than 6 mm, forged blanks are used, primarily consisting of medium-carbon low-alloy spring steels (silicon-manganese or chromium-vanadium spring steels) and high-quality carbon spring steels. Due to the high silicon-manganese content and low chromium-vanadium availability in China, disc springs mainly use 60Si2MnA. Comparing the two, 50CrVA offers better hardenability, temper stability, and impact toughness than 60Si2MnA, but 50CrVA is more expensive and suitable for applications with high fatigue requirements.

stafea spring classification

1) ISO ISO standard type: ISO gas springs are the most common typical type of gas spring. All technical parameters comply with the ISO11901 international standard for gas springs and Chinese national standards; B type gas springs also comply with the gas spring standards of companies such as FORD-WDX3560 (Ford), GM-M-150 (GM), and Renault (Renault). 2) Compact structure type: The compact structure type is also called J type gas spring, which is one series of gas springs, fully named J type compact structure gas spring. The J type compact structure gas spring is a type highly favored by mold designers. Compared to the B series gas springs, it has a shorter cylinder base length, resulting in a shorter overall length, which can reduce the design height of the mold, making it one of the preferred choices for mold-specific gas springs. 3) Ultra-compact type: This is the model with the shortest base length among gas springs worldwide. At the same time, its outer diameter is one size smaller than other types of gas springs (except for the T type extra-slim structure), but the piston rod diameter is the same, resulting in a small body with high force. The C type gas spring performs no worse than the ISO standard type gas spring in all aspects when the required working stroke is not too long. 4) Extra-slim structure type: This is the most compact cylinder diameter type among gas springs, featuring a piston seal design, 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 inferior to that of the C type gas spring.

Weidou Intelligent Technology specializes in selling German stafea compression springs, stafea extension springs, stafea helical springs, stafea wave springs, stafea constant-force springs, stafea torsion springs, stafea bending springs, stafea disc springs, stafea ring springs, stafea leaf springs, stafea torsion bar springs, stafea tension springs, stafea retaining rings, stafea tension springs, stafea mold springs. stafea products are original imports from Germany. We welcome inquiries and orders from customers.