Rotary forming
Rotary forming involves fixing a flat or preformed blank on a rotating core mold, applying pressure to the blank with a rotary wheel, and feeding it axially. Rotary forming has manual, automatic, routine, and robust methods. It can make plastic materials such as copper, iron, aluminum, stainless steel, and titanium alloys.
Rotary forming is an effective method for manufacturing precision products such as hollow cones, cylindrical parts, hemispheres, and thin-walled pipes. Rotary forming and developing products have high precision, good mechanical properties, and a wide range of sizes. Rotating tools and molds are simple and easy to replace; for some products, the production cost is lower than other methods. The main disadvantages of rotated forming are a long production time, low output, and limited variety. Rotate forming is suitable for the production of small batches and multi-variety products.
The main difference between rotary forming and stretching and stamping is that stretching and stamping gradually create a surface from a line. Hence, the required forming force is relatively large. Rotate forming is a process that progresses from point to bar and then from tube to surface. As a result, parts with fairly complex shapes can be made by the Rotate forming. Therefore, compared with sheet metal Rotary forming, metal Rotary forming can significantly simplify the equipment used in the process. Some parts that require multiple stampings can be produced by rotating forming once. Rotate forming can reduce mold manufacturing costs.
Rotational forming is divided into ordinary and strong rotational forming.
Ordinary Rotary forming mainly changes the shape of the blank, and the wall thickness remains unchanged, or it is a Rotary forming process that changes less. Routine rotation forming especially forms the workpiece by changing the diameter of the sheet material. It is a non-cutting forming process for processing thin-walled revolving bodies. The rotary wheel feeds the rotating metal circle or preformed blank to form the rotation forming.
Power rotate forming (thinning rotary forming) originates from ordinary rotary forming. During rotation forming, it not only changes the shape of the blank but also significantly changes (thins) its wall thickness. The difference between thinning rotate forming and ordinary rotate forming is that thinning rotate forming belongs to the category of volume deformation. The wall thickness is mainly reduced in the deformation process while the material volume is unchanged. A core mold’s size determines the shape of the finished product, and dimensional accuracy depends on how closely the process parameters match. When the cylindrical part is powerfully rotating, only the outer diameter reduces without changing the inner diameter (the opposite is true for internal rotation). Since the intense spinning reduces the wall thickness of the blank, a large amount of deformation is allowed in one spinning, making the production efficiency of the low spinning much higher than that of the ordinary spinning, and its application range also expands. Still, the corresponding strength rotates, forming requires equipment power.