Cold and warm flaring of thin-walled titanium tube using single-point incremental forming

Aghabeyki, Farid; Mirnia, Mohammad Javad; Elyasi, Majid

doi:10.1007/s00170-021-07135-x

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…In order to obtain more accurate results of temperature parameters, it cannot be empirically considered that about 90% of plastic work is converted into heat [25,26]. The integral expression of the work heat conversion coefficient β int is as shown [27,28]:…”

Section: The Materials Model Of Ti80 Alloymentioning

confidence: 99%

Effect of Piercing Temperature on Stress—Strain Distribution and Dimensional Accuracy for Ti80 Titanium Alloy Seamless Tubes Based on Numerical Simulation

Zhou,

Fu,

et al. 2023

Metals

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Titanium alloy tubes were an ideal material to replace steel tubes. However, the relationship between piercing temperature and dimensional accuracy for titanium alloy seamless tubes was unclear. Therefore, the effects of piercing temperature on the stress—strain distribution and dimensional accuracy of Ti80 titanium alloy were studied using thermal simulation compression tests, finite element numerical analysis optimization and optical microscopy. Pierced at 1050 °C, Ti80 titanium alloy was cross-rolled and perforated to obtain a capillary tube, whose dimensional accuracy was better than that of those pierced at 850 °C and 950 °C. The microstructure of Ti80 seamless tubes was layered α-Ti, grain boundary β-Ti and a Widmannstatten structure. The tensile strength, yield strength and absorbed energy were 867 MPa, 692 MPa and 52 J, respectively.

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Section: The Materials Model Of Ti80 Alloymentioning

confidence: 99%

Effect of Piercing Temperature on Stress—Strain Distribution and Dimensional Accuracy for Ti80 Titanium Alloy Seamless Tubes Based on Numerical Simulation

Zhou,

Fu,

et al. 2023

Metals

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“…These techniques can be categorized, based on the employed method, such as incremental forming [13] and punch press forming [14,15]. They can also be distinguished by the conditions applied, such as cold flaring [16] and hot flaring [17,18]. Furthermore, the number of forming cycles can differentiate between single-cycle flaring and multi-cycle flaring.…”

Section: Pre-production Testmentioning

confidence: 99%

Application of Digital Twin in the Industry of Axial Hollow-Wall Pipes

Guo,

Hu,

Jin

et al. 2023

Applied Sciences

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With the increasing demand for automation in agriculture, more and more researchers are exploring the application of digital twin in agricultural production. However, existing studies have predominantly focused on enhancing resource utilization efficiency and improving irrigation control systems in agricultural production through the implementation of digital twins. Unfortunately, there is a noticeable research gap when it comes to applying digital twins specifically to buried water conveyance pipelines within an agricultural irrigation infrastructure. Focusing on the long-term performance requirements of buried pipelines in agricultural irrigation and drainage, this study established a digital twin system for the industry of axial hollow-wall pipes with an outer diameter of 200 mm, specifically designed for this field of operation. The system was used to optimize the end-forming process of axial hollow-wall pipes, resulting in improved leak tightness under internal pressure and angular deflection of the pipes. The study suggests that the most effective method for the end-forming process of axial hollow-wall pipes is to heat the pipe for 60 s at the ambient temperature of 15 °C, with heating temperatures of 225 °C on both the inner and outer sides. Additionally, preheating the stamping equipment to 70 °C and controlling the cooling temperature, during pipe detachment, to between 35 °C and 45 °C is recommended. In terms of the leak tightness under internal pressure and angular deviation, the study found that increasing the thickness of the protruding end of the sealing ring to 16 mm, and shortening the chamfer length to 20 mm, while maintaining the same slope, can enhance the sealing effectiveness of the pipeline interface. The implementation of the digital twin system improves the production efficiency of the hollow pipe production line during the end-forming process, resulting in a yield rate of the pipe of up to 95% for qualified products. Moreover, the system provides intelligent closed-loop feedback which ensures the long-term operation and maintenance of the pipelines, making it easier to identify problems and implement design improvements. By doing so, it contributes to ensuring the long-term stability of related agricultural production.

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“…Through the introduction of hot forming into the corresponding tube forming, such as flaring, spinning, extrusion, etc., the existing studies have shown that the formability can be effectively improved. The end flaring of the commercially pure grade 2 titanium tube is experimentally and numerically investigated at room and high temperatures [7]. It is shown that cylindrical, elliptical, and square flaring with specified dimensions, which are not possible at room temperature, can be successfully carried out at a temperature of 400 • C. For the hot spinning of titanium alloy, Gao et al [8] revealed the effects of process parameters and microstructure on damage evolution.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Current Intensity and Feed Speed in Electrically Assisted Necking and Thickening of 5A02 Aluminum Alloy Tubes

Fan,

Xu,

Tao

et al. 2024

Materials

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In order to further explore the forming limits of thin-wall tube necking and thickening, and obtain sufficient thickness of the tube in the thickening area, local electric pulse-assisted forming experiments were carried out to study the effects of current intensity and feed speed on the necking and thickening forming of thin-wall tube. The experimental results show that with the increase in current intensity, the temperature in the forming area of the tube increases, and the forming load for necking and thickening decreases. However, with the increase in feed speed, the overall forming load for necking and thickening increases in general, and the smaller feed speed is more conducive to forming. Taking into account the forming efficiency and electrode loss, the corresponding forming process window is obtained for the manufacturing of good parts. That is, during the necking stage, the current intensity shall not be less than 300 A, and the feed speed shall not exceed 10 mm/min. During the thickening stage, the current intensity should not be less than 1400 A, and the feed speed should not exceed 1 mm/min. The target part is finally formed, with an average wall thickness of 5.984 mm in the thickening zone and a thickening rate of 303.2%.

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Cold and warm flaring of thin-walled titanium tube using single-point incremental forming

Cited by 6 publications

References 17 publications

Effect of Piercing Temperature on Stress—Strain Distribution and Dimensional Accuracy for Ti80 Titanium Alloy Seamless Tubes Based on Numerical Simulation

Effect of Piercing Temperature on Stress—Strain Distribution and Dimensional Accuracy for Ti80 Titanium Alloy Seamless Tubes Based on Numerical Simulation

Application of Digital Twin in the Industry of Axial Hollow-Wall Pipes

Experimental Investigation of Current Intensity and Feed Speed in Electrically Assisted Necking and Thickening of 5A02 Aluminum Alloy Tubes

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