Feasibility of High-pressure Forming in Reducing Tees
Posted: 08/12/2022 09:04:54 Hits: 14
After the persistent efforts of domestic and foreign researchers, the high-pressure forming technology of pipes has a relatively mature process method and a rich research experience. The basic research of this technology has applied to various fields, and it has a long-term research prospect for high strength and light weights in the aviation field; it is also very necessary. Through research on the technology of reducing equal tee, it can be more conducive to accelerating the development of pipe bulging, broadening the application field of a tee, and promoting the progress of China's manufacturing industry. In recent years, with the popularization and development of computers, the application of finite element simulation technology in the manufacturing industry has also been improved. The finite element pipe bulging simulation such as DYNAFORM and ABAQUS can simulate the simulation results under different internal pressures and feed rates. The parameters can be improved to select the optimal forming influence coefficient, reduce the number of experiments and the cost of experiments, and contribute to green environmental protection, energy saving and emission reduction.
In the traditional forming methods of equal tees and reduced tees, the wall thickness of the formed parts is unevenly distributed, and the bottom of the equal tee pipe is thickened to different degrees; the neck and top of the branch pipe are relatively thin. The essential reason is that the feeding of the pipe in the hydroforming process leads to the bottom material not flowing, resulting in accumulation. It is more prominent in the reducing tee. Therefore, according to the principle of constant volume, change the blanking size of the tube blank by predicting the material flow of the branch pipe of the reducing tee; carry out simulation, and obtain the optimal and convenient shape of the tube blank through a series of comparative experiments. Combined with the new forming process, numerical simulation software is used for simulation, and then different forming process tests are used to verify each other, which provides a reference for the actual internal high-pressure forming research and solves the problem of difference in the distribution of wall thickness of reducing tees.
There have been many studies on the conventional equal tee, while the research on the forming of the reduced tee of the thin-walled aluminum alloy is relatively rare. Compared with the equal tee, the radial material flow of the branch pipe is more complicated, and the matching relationship between the required pressure and the feed rate is more complicated. Through the combination of simulation and experiment, a method for forming reducing tee suitable for manufacturing and production is proposed. Through this method, a formed part with a more uniform wall thickness is produced, and a set of molds that are easy to install and have good applicability are designed in combination with the experiment, which is convenient for more follow-up research.
In the traditional forming methods of equal tees and reduced tees, the wall thickness of the formed parts is unevenly distributed, and the bottom of the equal tee pipe is thickened to different degrees; the neck and top of the branch pipe are relatively thin. The essential reason is that the feeding of the pipe in the hydroforming process leads to the bottom material not flowing, resulting in accumulation. It is more prominent in the reducing tee. Therefore, according to the principle of constant volume, change the blanking size of the tube blank by predicting the material flow of the branch pipe of the reducing tee; carry out simulation, and obtain the optimal and convenient shape of the tube blank through a series of comparative experiments. Combined with the new forming process, numerical simulation software is used for simulation, and then different forming process tests are used to verify each other, which provides a reference for the actual internal high-pressure forming research and solves the problem of difference in the distribution of wall thickness of reducing tees.
There have been many studies on the conventional equal tee, while the research on the forming of the reduced tee of the thin-walled aluminum alloy is relatively rare. Compared with the equal tee, the radial material flow of the branch pipe is more complicated, and the matching relationship between the required pressure and the feed rate is more complicated. Through the combination of simulation and experiment, a method for forming reducing tee suitable for manufacturing and production is proposed. Through this method, a formed part with a more uniform wall thickness is produced, and a set of molds that are easy to install and have good applicability are designed in combination with the experiment, which is convenient for more follow-up research.
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