Why choose spinning technology for aluminum alloy wheels? The editor takes everyone to understand the power of the spinning process.
If you don’t have an intuitive understanding of the spin-forming technology, then you can imagine the picture of pottery shaping during pottery production: on a rapidly rotating billet puller, a ball of clay continuously changes shape in the hands of pottery workers. The principle of spin forming is actually the same as this ancient process, except that the former is used on metal and the latter is used on clay.
Spinning technology has always been an indispensable process in high-tech fields such as military and aerospace, thanks to its excellent processing characteristics. Now with the improvement of technology, spinning technology is also playing an increasingly important role in other fields of manufacturing.
Spinning technology
The spinning forming technology is to use the feed motion of tools such as a rotating wheel to press the metal cylinder blank, flat blank or preform against the mandrel of the spinning machine with the tail top, and the spindle drives the mandrel and the blank to rotate and rotate at the same time. The pressing wheel squeezes the material on the rotating mandrel from the side of the blank to cause continuous plastic deformation of the material point by point, thereby obtaining hollow busbar parts of various busbar shapes.
Schematic diagram of spinning forming principle
As a new technology in plastic processing, strong spinning has obvious advantages in the production of thin-walled high-precision rotary body parts:
(1) The strength and hardness of the material after spinning are improved by about 35% to 45% compared with the base material, so the spinning technology can effectively reduce the design wall thickness and weight of the parts, and its fatigue performance can also be significantly improved;
(2) Spinning is local continuous processing, the instantaneous deformation area is small, the total deformation force required is small, the processing equipment requirements are simple, and the mold cost is low;
(3) Spinning is a non-cutting process, and the material utilization rate is high, which is conducive to reducing production costs;
(4) The dimensional tolerance and shape tolerance of the spin-formed parts are small;
(5) Spinning is an axial drawing process. The material in the deformation zone is in a two-way or three-way compressive stress state, so it can achieve a higher degree of deformation.
Spinning technology application
The technological advantages of the spinning forming technology in the forming of thin-walled, light-weight, high-strength, high-precision, and good fatigue-resistant rotor components cannot be replaced. It is based on numerous advantages, especially the improvement of the strength, hardness and fatigue resistance of parts after strong spinning, and the spinning technology has been widely used in the manufacture of parts in the fields of automobiles, military industry, and aerospace.
Materials currently available for spin forming include aluminum alloys, magnesium alloys, titanium alloys, copper alloys, low carbon steels, high temperature alloys, maraging steels, high strength steels, ultra high strength steels, stainless steels, etc.
Auto parts manufacturing
In the automotive industry, hub manufacturing is an important application area for spin forming technology. As one of the three main processes for China wheel manufacturing , the spin-processed hubs integrate various technical features such as forging, extrusion, stretching, transverse rolling, rolling, etc. They have good quality, high flexibility, light weight, and rigidity. Strong and many other advantages. The spin-formed hub not only reduces the processing volume and saves material, but also maintains the compactness of the metal and the dynamic balance of the hub. In addition, while the spinning hub has sufficient rigidity, it can more conveniently control the wall thickness of the hub and make the weight lighter. As with the size of aluminum alloy spinning wheels and casting wheels, the weight of the former can be reduced by 15%.
Aviation parts manufacturing
Spin forming technology has been widely used in aerospace manufacturing. For example, for aero engines, the propeller spinner dome, casing, lip, intake cone, nozzle, nozzle, etc. are all partly formed by the spin forming process. These parts are special in materials and large in size. After the spin forming process is used, the integrity of the structural components is improved, the deformation of the welds and parts is reduced, and the workload of manual shape correction is reduced. More importantly, due to the rotation The increased material strength after pressing can reduce the design wall thickness of the parts, thereby reducing the weight of the whole machine and improving the reliability of the whole machine.
In addition, in aircraft manufacturing, various nose covers, auxiliary fuel tanks, air intakes, gas cylinders, tie rods, slide rails, and actuators have all been formed by spinning.
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