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Polyurethane rubber bending rollers
When comparing polyurethane to traditional rubber, the former offers superior mechanical properties and lower tooling costs. Polyurethane is also durable, requiring less maintenance, which means fewer replacement costs. Its excellent wear resistance makes it an excellent choice for many applications, including food processing. Here are a few reasons why polyurethane is better than traditional rubber bending rollers. You might be wondering what sets them apart.
The material used in polyurethane bending rollers is incredibly tough. This material forms a robust outer hub that readily absorbs shock and resists cutting. It also bonds to a tough, durable inner bearing for increased wear resistance. The material is typically manufactured in a uniform roll, allowing you to cut the length you need. And, as an added benefit, polyurethane bending rollers are easy to maintain.
Air bending is a method of forming sheet metal using compressed air. The material is placed between two dies. The punch forces the material into a bottom V-shaped die mounted on a press. The punch forces the material into the bend in an angle greater than the thickness of the material. The bottom die has a square or V-shaped opening, which is referred to as tooling. This method is the most commonly used in the manufacturing industry, and it requires less bend force. However, the tools used in air bending are typically smaller than those required for other methods.
This method provides flexibility, allowing for bends ranging from 90 to 180 degrees. It is less accurate than bottoming, but it can produce bends of any desired angle without retooling. The air bending process does not require retooling for different angles, which can be beneficial for small businesses that want to create products in various shapes. The advantages of air bending over bottoming are numerous. The most obvious one is its ability to produce bends between 90 and 180 degrees.
In V-die bending for rubber, a steel die and a rubber pad are fastened to a work piece. The sheet material is A3 SR EN 10130:2007 and the bend specimens are 50x50x1mm. The rubber pad has a hardness of 66 Shore A and silicone rubber has a hardness of 46 Shore A. This method is suited for producing sheet-to-sheet bends for automotive and other applications.
In the present study, a new elasto-plastic incremental finite-element computer code was developed to model the V-die bending process. It was further derived from an updated Lagrangian formulation. It introduced a modified Coulomb’s friction law to treat the sliding-sticking state of friction at the contact interface. The simulation results were compared to experimental data and showed good agreement. The results of the numerical model of the V-die bending process were compared to experimental measurements.
Rubber-assisted stretch bending
The rubber-assisted stretch bending process can achieve uniform bending with constant curvature radius. It does not use any special mechanism or equipment and imparts tensile force to the metal surface of the die. This technique is very advantageous in manufacturing bent profiles with a high degree of shape accuracy. To achieve this, the bending die has a radius of bending of the geometric center layer of the profile, which is the bending die radius.
The classic theory of rubber’s elasticity was developed in the 1940s. This theory is based on the fact that rubber’s molecules are made of long chains of isoprene, which are attached to each other via weak van der Waal forces. In its natural state, these chains are in random configurations. When a rubber band is bent, it stretches, causing its molecules to unravel. As a result, the polymer tends to curl back up.