As a high-performance metal material, titanium alloy has the characteristics of excellent corrosion resistance, high strength and low density, and is widely used in aviation, aerospace, chemical industry and other fields. However, titanium alloy forgings are prone to deformation problems in the processing process, affecting their performance and accuracy.
1. The reason for the deformation of titanium alloy forgings.
Material properties: Titanium alloy has a high coefficient of thermal expansion and low thermal conductivity, which leads to a large temperature gradient in the heating and cooling process, which in turn causes internal stress and deforms the forging.
Processing technology: The processing technology of titanium alloy forgings has a significant impact on its deformation. Improper setting of process parameters such as heating temperature, heating time, processing temperature, and processing speed may lead to uneven temperature distribution inside the forging, causing internal stress and leading to deformation.
Mold design: Unreasonable mold design, such as mismatch between the shape of the mold cavity and the shape of the forging, insufficient stiffness of the mold, etc., may also lead to the deformation of the forging during the forming process.
Operating factors: Improper operation by the operator during the forging process, such as incorrect placement of the blank, excessive striking force, etc., may also lead to the deformation of the forging.
2. Measures to prevent the deformation of titanium alloy forgings.
Optimized material selection: Choosing titanium alloy materials with low coefficient of thermal expansion and high thermal conductivity can effectively reduce the internal stress and deformation caused by temperature changes.
Rational machining process: Reduction of internal stresses caused by temperature gradients by optimizing heating, holding and cooling process parameters. For example, we can use the appropriate heating temperature and heating time to control the processing temperature and processing speed.
Mold design optimization: Improve the accuracy of mold design to ensure that the shape of the mold cavity matches the shape of the forging. At the same time, the stiffness of the mold is strengthened to reduce the deformation during the molding process.
Operation specifications: Strengthen the training and management of operators to ensure that they are proficient in forging operation skills. During the operation, strictly abide by the process regulations to avoid deformation caused by improper operation.
Heat treatment and correction: For titanium alloy forgings that have been deformed, they can be repaired by appropriate heat treatment and correction measures. For example, methods such as thermal correction, cold correction or mechanical correction are used to eliminate internal stresses and restore the shape accuracy of forgings.
By optimizing the material properties, formulating reasonable processing technology, improving the accuracy of mold design and standardizing the operation process, the risk of deformation of titanium alloy forgings can be effectively reduced.