High-temperature alloys are mostly solid-solution strengthened nickel-based oxidation-resistant alloys, which have good plasticity and moderate thermal strength below 900°, and are suitable for manufacturing engine main combustion chambers, afterburner components and guide vanes that work long-term below 900° . Similarly, this material also has the defects of high resistance to deformation and serious springback of parts. Products processed by traditional methods have low strength, poor reliability, and low material utilization. Using metal spinning technology can effectively avoid these shortcomings.
Titanium alloy is a lightweight material, but it has poor plasticity at room temperature and high resistance to deformation, so it is extremely difficult to perform metal spinning at room temperature. After many technical tests and improvements, technicians found that hot spinning can overcome the problems of high deformation resistance of titanium alloy at room temperature, serious deformation of parts, and serious processing hardening of materials, and realize stable production of small and medium batches of titanium alloy thin-walled rotary parts. Typical application examples are heterogeneous parts in aircraft engines such as titanium alloy cylinders and cones. In the past, these parts were welded and formed by reels, and the finished products had relatively thick walls. With hot spinning, not only can titanium alloy with better strength and heat resistance be used, but also the wall thickness of the spinning product is smaller and the weight is lighter, which can avoid other problems caused by busbar welding and improve the durability and safety of the product .
During the spinning process, pay close attention to the microstructure and properties of the superalloy, arrange the spinning process reasonably, and obtain a blank suitable for spinning by performing an appropriate annealing treatment on the blank. In addition, it is particularly important to control the heating temperature of the superalloy material during the spinning process, because the spinning temperature is too low, the parts will not stick to the mold and the deformation resistance of the material will be too large, and defects such as cracks will easily appear on the edge of the blank, and even the blank will crack, resulting in scrapped.
Compared with traditional forging processing, metal spinning processing can make the wall thickness of the product thinner and lighter in weight, so as to meet the overall lightweight requirements. High-temperature spinning is a good combination of difficult-to-machine materials such as titanium alloys and high-temperature alloys. However, different materials have different characteristics. When high-temperature spinning is used, the best matching process plan should be explored in combination with material characteristics, and parameters such as spinning temperature and material properties after spinning should be measured to accumulate experience for processing similar materials. The later high-temperature spinning provides a basis.
