In precision components for aerospace and high-end medical devices, Ti-6Al-4V titanium alloy has become an irreplaceable core material due to its high strength, lightweight, and excellent corrosion resistance. However, this "performance king" presents significant challenges during bending; even slight errors can lead to cracking, springback, and other problems, affecting product quality. Today, we'll break down the key considerations for processing Ti-6Al-4V titanium alloy bent parts to help you easily overcome these process difficulties!
1. Preheating and Temperature Control
Ensuring a Safe Processing Line. Ti-6Al-4V titanium alloy has poor plasticity at room temperature, and low-temperature bending can easily cause cracking. Therefore, the workpiece must be preheated before processing. The preheating temperature must be strictly controlled between 200-400℃. This temperature range can effectively improve the material's plasticity and create favorable conditions for bending.
At the same time, the risk of localized overheating should be noted. When the temperature exceeds 500℃, the grains of Ti-6Al-4V titanium alloy will coarsen rapidly, leading to a significant decrease in mechanical properties. It is recommended to use an infrared thermometer to monitor the workpiece temperature in real time to ensure uniform and accurate heating, thus preventing potential quality problems from the outset.
2. Bending rate and pressure: Low-speed precision, scientific compensation
Due to the strain-aging characteristic of Ti-6Al-4V titanium alloy, rapid bending can easily cause stress concentration. Therefore, the bending process should be carried out at a low speed, preferably <=5mm/s. Smooth operation can reduce stress accumulation and avoid workpiece damage.
Determining the bending pressure requires trial bending to find the optimal value: too little pressure will cause severe springback of the workpiece, and the springback rate of Ti-6Al-4V titanium alloy is much higher than that of ordinary steel, so a 10%-15% compensation allowance should be reserved; too much pressure may cause wrinkling and cracking at the bend, directly affecting the product qualification rate.
3. Molds and Lubrication: Proper matching reduces frictional loss
The quality of the die directly determines the bending accuracy. Given the high hardness of TC4 titanium alloy, dies made of high-strength materials such as H13 hot work die steel should be selected. Their excellent wear resistance and thermal stability effectively resist wear during processing, ensuring stable bending accuracy. Furthermore, a high-temperature, molybdenum-based lubricant must be applied to the contact area between the workpiece and the die before bending. This operation not only significantly reduces frictional resistance and prevents scratches on the workpiece surface but also prevents the die from sticking to the workpiece, making the bending process smoother.
4. Subsequent processing and quality inspection: Multiple layers of checks to ensure quality
After bending, residual internal stress will remain in the workpiece. If not eliminated in time, deformation may occur during subsequent use. Stress-relief annealing is necessary in this case. The workpiece is held at 550-600℃ for 1-2 hours to completely release the internal stress and ensure product dimensional stability.
1. Bending angle tolerance: Strictly adhere to standard, controlling tolerance within ±1℃ to ensure assembly accuracy;
2. Surface defects: Carefully inspect for cracks, dents, and other issues to avoid affecting product appearance and lifespan;
3. Mechanical properties: Test the tensile strength at the bending point, ensuring at least 90% of the base material's properties are retained to ensure the product can withstand complex working environments.
Baoji Reliab Metal Materials Co.,Ltd
Mobile: 0086 13092900605
Sales Department 1: WhatsApp +8613092900605 (Mr.Gary)
Sales Department 2: +8613092913521(Ms. Sophia)
Address: No.35 Baoti Rd, Weibin District, Baoji, China
