German tmej springs tmej models tmej prices

tmej springs are helical springs that withstand axial tensile forces. Extension springs are generally manufactured from materials with a round cross-section. When not under load, the coils of an extension spring are typically closed together with no gaps. Many different terminal devices or "hooks" are used to ensure the source of tension for the extension spring. The working principle of extension springs is opposite to that of compression springs. Compression springs exert a reactive force when compressed, whereas extension springs exert a reactive force when extended or pulled apart. When the two ends of an extension spring are pulled apart, the spring attempts to pull them back together. Like compression springs, extension springs also absorb and store energy. However, unlike compression springs, most extension springs are usually under a certain degree of initial tension, even when there is no external load. This initial tension determines how tightly the extension spring is coiled when there is no load.

tmej spring surface treatment

1) Black oxide treatment: This surface treatment provides a black finish; black oxide is primarily for aesthetic improvement rather than corrosion resistance. 2) Chrome plating: Chrome plating is mainly a treatment method for carbon steel products, primarily intended to increase corrosion resistance. 3) Oil impregnation: Oil impregnation is a standard treatment method for carbon steel parts, intended 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 black oxide. 6) Ultrasonic cleaning: This is a standard surface treatment method for stainless steel materials. 7) Vibratory deburring: To eliminate sharp edges on the product.

tmej 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 components can achieve higher bending quality. In addition, the 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 radii for materials provided in references are mainly absolute 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-clearance or negative-clearance bending can change the stress state of the sheet metal, transforming ordinary bending into bending with tensile characteristics, placing the inner side of the neutral layer of the blank under compressive stress, 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, reducing springback (Figure 4). Therefore, adopting stretch-bending processes and dies with adjustable clearances 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 springback is smaller than U-type. If suitable stiffening ribs are pressed at the bending location, the springback will be even smaller. Therefore, flanging or hemming treatments for bent parts can both increase stiffness and reduce springback. 5) Adopt appropriate microstructural states: Materials after cold work hardening exhibit large bending springback. For bending parts with high accuracy requirements where the blank has undergone cold work hardening, annealing treatment should be performed before bending. Where necessary and permissible, heating the blank during bending should be adopted for thicker blanks to eliminate springback. The springback angle in corrective bending is significantly smaller than in free bending, and the greater the corrective force, the smaller the springback. 6) Correct the shape of the bending punch: This is because the corrective bending force concentrates the punching force in the bending deformation zone, forcing the inner metal layer to be compressed. After the sheet metal is corrected, 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, corrective bending is a bending method similar in nature to stretch bending, and its application range is somewhat wider. Generally, the shape shown in Figure 5 is mostly adopted for corrective bending punches.

tmej spring classification

1) ISO international standard type: ISO gas springs are the most common typical type of gas springs. All technical parameters comply 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, with the full name being J type compact structure gas spring. The J type compact structure gas spring is a type widely welcomed by mold designers. Compared with the B series of gas springs, it has a shorter cylinder base length, and 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: This 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 for the T type extra-slim structure type), but the piston rod diameter is the same, so it is small in size but powerful. 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 type of gas spring in terms of cylinder diameter. It is a piston-sealed type, 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 the C type gas spring.

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