Power spinning is also called thinning spinning. Power spinning is a non-cutting processing method developed on the basis of ordinary spinning. When spinning, use the tail top to fix the blank on the mold. When the mold rotates, the rotating wheel makes a feeding motion, so that the blank continuously becomes thinner point by point and abuts against the mold to form a part of the required shape. Power spinning realizes the forming of the workpiece by changing the thickness and shape of the blank.
Common powerful spinning methods
According to the deformation law and the shape of the formed parts, the spinning methods of the powerful spinning can be divided into two categories: the powerful spinning of the cylindrical part and the powerful spinning of the conical part. Flow spinning is mainly used for the forming of high-precision long tube parts (as shown on the left), and shear spinning is mainly used for forming conical parts (as shown on the right).
1. Powerful spinning of cylindrical parts
The powerful spinning of cylindrical parts is also called flow spinning, which refers to the short and thick cylindrical blanks are sleeved on the mold, and the blanks are fixed on the mold by means of tail tip and gear plate. When the blank and the mold rotate with the main shaft, the roller and the mold maintain a prescribed distance, and make a feed movement parallel to the direction of the mold generatrix, so that the blank material is squeezed from the gap between the roller and the mold point by point from one end during rotation Out. At this time, the rotating wheel is in contact with the blank and rotates due to friction. The result of the deformation is that the wall thickness of the blank is reduced, the inner diameter remains basically unchanged, and the axial extension is achieved. During spinning, under pressure, the blank only produces plastic deformation in the small deformation zone in contact with the spinning wheel. Due to the greater resistance in the circumferential direction, the pressed metal flows toward the axial direction with the least resistance, and finally meets the wall thickness and diameter. The size of the cylinder required.
2. Powerful spinning of conical parts
Powerful spinning of conical parts is also called shear spinning, which refers to the installation and fixation of the sheet material or the conical blank on the mold. When spinning, the rotating wheel rotates with the workpiece and the mold, and the workpiece deforms point by point, so that the blank can reach the required wall thickness and angle. There are two ways of shear spinning, forward rotation and reverse rotation.
The application of powerful spinning technology in aviation manufacturing.
On airplanes, various nose covers, auxiliary fuel tanks, air intakes, gas cylinders, tie rods, slide rails, and actuators are all formed by spinning. In the engine, most of the propeller cap, casing, lip, intake cone, nozzle, nozzle, etc. are also formed by spinning. Such parts have complex structures, special raw materials, and large product sizes. The use of spinning forming can improve the integrity of structural components, reduce welds and component deformation, and reduce the workload of manual calibration. More importantly, due to the increased strength of the material after spinning, the design wall thickness of the parts can be reduced, thereby reducing the weight of the whole machine and improving the reliability of the whole machine.