Germany cefeg gmbh springs cefeg gmbh models cefeg gmbh prices

cefeg gmbh springs are conical disc-shaped. They 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 load required for sealing, reducing the continuous tightening requirements for gaskets and packing. Disc springs are special springs that are conical in the axial direction and bear loads. After deforming under load, they store potential energy. When bolts loosen, the disc spring releases part of the potential energy to maintain pressure in the flange connection to meet sealing requirements. The stress distribution of disc springs decreases uniformly from the inside out, achieving high compensation force with low travel.

cefeg gmbh spring principle

When leaf springs are installed in an automobile suspension and the vertical load is positive, all spring leaves deform under force, tending to arch upward. At this time, the axle and frame move closer to each other. When the axle and frame move apart, the positive vertical load and deformation on the leaf spring gradually decrease, sometimes even reversing. The eye of the main leaf is heavily stressed and is a weak point. To improve the stress condition of the main leaf eye, the end of the second leaf is often bent into an eye that wraps around the outside of the main leaf eye, known as a wrap-around eye. A large gap is left between the main leaf eye and the second leaf wrap-around eye to allow relative sliding between leaves during elastic deformation. In some suspensions, the ends of leaf springs are not made into eyes but use other support connections, such as rubber support pads. Flat rectangular steel plates are curved to form chassis springs made of stacked leaves. One end is installed on the hanger with a pin, and the other end is connected to the main beam with a shackle, allowing the spring to expand and contract. This is suitable for medium and large trucks. Automobile leaf springs are very important. As is known, leaf springs consist of many steel leaves that are elastic, have consistent width and thickness, but vary in length. Their function is to connect the frame and axle in a suspended manner, exposed between the frame and axle, bearing the load impact of the wheels on the frame, reducing severe vehicle vibration, and maintaining driving stability and adaptability to different road conditions. When leaf springs bear load impacts, they undergo extension motion, causing strong friction between steel leaves, i.e., compression and tension phenomena. The two friction surfaces generate friction forces in different directions, causing the temperature of the leaf spring to rise, resulting in surface scratches and fine cracks. As the frequency of load impact increases, the friction force generated by the extension motion also increases. When the stress concentration point reaches the fatigue limit, it will cause single-leaf or entire stack fracture. Tests based on kinematic principles prove that for a steel component undergoing compression-extension motion, as the motion frequency increases, the temperature of the steel component rises, strength decreases, cracks appear at stress concentration points and gradually expand and deepen, leading to damage at the fatigue limit. Leaf springs are similar, except they have higher elasticity and are more durable than general steel components. Apart from other causes, the main reason for leaf spring fracture is poor lubrication, which should be valued by drivers and technical management personnel. Timely lubrication of leaf springs should be performed to reduce friction and disperse stress, preventing surface scratches on steel leaves; reduce intrusion of dust, dirt, and water to prevent rust; and dissipate heat to prevent a decrease in elastic strength. The general lubrication method is: perform after the new vehicle break-in period ends, and during use in summer and winter. For lubrication, first remove the leaf spring, open the center bolt to separate the steel leaves, then evenly apply lithium-based grease or graphite grease to both sides of the steel leaves. After reassembly, an oil film forms between the two friction surfaces (comparing the time required for one set of leaf spring lubrication to replacing one broken leaf).

cefeg gmbh spring selection

A. Selection of spring force: Select the quantity, model, and spring force of each gas spring based on the calculated punching force. Generally, the spring force of the gas spring should be selected by adding 15%-20% increment to the calculated punching force, which is more realistic. First, when the mold wears, gaps change. Changes in process parameters such as blunt cutting edges, inconsistency in mold thickness and sheet metal deformation resistance cause changes in workpiece deformation resistance, so margin should be left in the design of deformation resistance. Second, during gas charging, high-pressure gas inevitably has throttling losses, causing the spring force to float downward. Third, gas springs have a long life; after a period of use, high-pressure nitrogen will have certain leakage, causing a slight decrease in spring force. B. Selection of the number of gas springs: Based on alignment requirements, combined with mold structure and force application points, ensure no eccentric loading occurs during mold operation, while also making mold adjustment convenient. This ensures sufficient service life for gas springs. C. Selection of gas spring boost ratio: Can be selected based on the gas spring characteristic curve and stamping process requirements to determine the gas spring model. It is especially important to determine the boost ratio when stable working force change, basically constant working force, or large initial force is required. D. Selection of gas spring stroke: Regardless of the process, when selecting gas springs, hope that the total height of the gas spring is not too high to avoid instability and overly complex structure during installation on the mold. Also, the larger the stroke, the higher the price of the gas spring, which is particularly important for independent gas springs. If the stroke is indeed large due to process needs, it is recommended to adopt a gas spring seat plate system, which can reduce mold height and improve gas spring stability and reliability. Sometimes for safety and to avoid accidents, when selecting gas springs, a safety stroke of 3-5mm needs to be increased. Selection of gas spring structural form: When designers use gas springs in molds, they first need to decide their structural form. Comprehensive consideration should be given to stamping process requirements for required parts, mold structural form, equipment used, working environment, working conditions, mold cost, and adjustment and maintenance factors. A. Independent type: The most widely used is the independent gas spring. It occupies less mold space, is firmly placed, and has various structural forms. Several different installation forms do not require any accessories. It can be used by directly placing it in the mold. It is the preferred design form for designers today. B. Pipeline connection type: Pipeline connection type is generally applied to large stamping parts and large coverings. It uses high-pressure pipes to connect individual gas springs together, and installs a control instrument to make the spring force of each gas spring in the entire system equal, thus integrating the entire system into one, equivalent to an independent gas spring. Thus, a larger spring force and balance of spring force transmission are achieved, improving mold life and ensuring the quality of stamped parts.

cefeg gmbh spring manufacturing process

1) Cold forming process capability for one-time automation. Cold forming machines have developed to 12 jaws. Steel wires in the range of (0.3～14) mm can be formed in one go on 8 jaw forming machines. Development direction of forming process equipment: (1) Increase forming speed, the main development trend is to increase the forming speed of equipment, i.e., production efficiency; (2) Improve equipment durability by increasing the precision of equipment parts and enhancing heat treatment effects; (3) Add length sensors and laser rangefinders to implement automatic closed-loop control of the manufacturing process for CNC forming machines. 2) Cold forming process range capability. Large wire diameter spring coiling machines, maximum specification can reach 20mm, =2000MPa, winding ratio 5. Cold forming processes for variable or constant diameter Minic-Block springs and eccentric springs still have limitations. 2) Hot forming process speed capability. In China, forming in the (9~25) mm specification range only has CNC2 axis hot coiling machines, with a maximum speed of 17 pieces per minute. There is a large gap compared with developed countries. 2) Control capability for large spring hot forming process. Since there are only CNC2 axis hot coiling machines, shape control lacks action in three directions, resulting in poor precision; moreover, there are no automatic bar rotation control and adjustment mechanisms, so the level and capability of hot coiled spring forming processes are relatively low. Therefore, the precision level and surface oxidation and decarburization level of springs are also relatively low.

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