@misc{BuhlHaertelBesong, author = {Buhl, Johannes and H{\"a}rtel, Sebastian and Besong, Lemopi Isidore}, title = {Temperature Control of the Two-Point Incremental Forming Process to Achieve Homogeneous Martensite Content Based on Finite Element Simulations}, series = {Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity, ICTP 2023 - Volume 1}, journal = {Proceedings of the 14th International Conference on the Technology of Plasticity - Current Trends in the Technology of Plasticity, ICTP 2023 - Volume 1}, editor = {Mocellin, Katia}, publisher = {Springer}, address = {Cham}, isbn = {978-3-031-41022-2}, issn = {2195-4356}, doi = {10.1007/978-3-031-41023-9_74}, pages = {739 -- 747}, abstract = {Deformation-induced martensite has been observed in the incremental sheet forming of metastable austenitic stainless steels (MASS). The presence of martensite improves the characteristics of the springs. Martensite transformation usually occurs at low temperatures (<70 ℃). Depending on the tool speed, incremental forming of disk springs requires between 3 to 5 min. The forming time needs to be short to increase the process output in industrial settings. However, accelerating the process leads to high temperatures above the martensite transformation temperature that suppress martensite formation, necessitating temperature control during forming. It is suggested to enhance the martensite content of the blank by cooling during the forming operation. In this contribution, two-point incremental sheet forming is conducted to determine the influence of process temperature on the phase content of MASS disk springs. A temperature-dependent phase change material model that includes the strain rate effect is implemented in finite element (FE) simulations to predict the martensite content. FE simulations are performed to investigate the convection coefficients and cooling time leading to process temperatures below 70 ℃. The framework can be used to control and speed up the incremental forming of disk springs while maintaining a high martensite content.}, language = {en} } @misc{BesongBuhlHaerteletal., author = {Besong, Lemopi Isidore and Buhl, Johannes and H{\"a}rtel, Sebastian and Bambach, Markus}, title = {Increasing the Forming Limits in Hole Flanging of Dual-Phase (DP) 1000 Steel Using Punch Rotation}, series = {Key Engineering Materials}, volume = {Vol. 926}, journal = {Key Engineering Materials}, issn = {1662-9795}, doi = {10.4028/p-06y8un}, pages = {717 -- 723}, language = {en} } @misc{BesongBuhlUensaletal., author = {Besong, Lemopi Isidore and Buhl, Johannes and {\"U}nsal, Ismail and Bambach, Markus and Polte, Mitchel and Blumberg, Julian and Uhlmann, Eckart}, title = {Development of Tool Paths for Multi-axis Single Stage Incremental Hole-flanging}, series = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, volume = {47}, journal = {Procedia Manufacturing; Part of Special issue: 23rd International Conference on Material Forming}, editor = {Bambach, Markus}, issn = {2351-9789}, doi = {10.1016/j.promfg.2020.04.290}, pages = {1392 -- 1398}, language = {en} } @misc{BlumbergLiBesongetal., author = {Blumberg, Julian and Li, Zhoulong and Besong, Lemopi Isidore and Polte, Mitchel and Buhl, Johannes and Uhlmann, Eckart and Bambach, Markus}, title = {Deformation error compensation of industrial robots in single point incremental forming by means of data-driven stiffness model}, series = {26th International Conference on Automation and Computing (ICAC), 2-4 Sept. 2021, Portsmouth, United Kingdom}, journal = {26th International Conference on Automation and Computing (ICAC), 2-4 Sept. 2021, Portsmouth, United Kingdom}, isbn = {978-1-86043-557-7}, doi = {10.23919/ICAC50006.2021.9594138}, pages = {6}, language = {en} } @misc{BesongBuhlBambach, author = {Besong, Lemopi Isidore and Buhl, Johannes and Bambach, Markus}, title = {Investigations on hole-flanging by paddle forming and a comparison with single point incremental forming}, series = {International Journal of Mechanical Sciences}, volume = {vol. 164}, journal = {International Journal of Mechanical Sciences}, issn = {0020-7403}, doi = {10.1016/j.ijmecsci.2019.105143}, pages = {17}, language = {en} } @misc{BesongBuhlBambach, author = {Besong, Lemopi Isidore and Buhl, Johannes and Bambach, Markus}, title = {Increasing formability in hole-flanging through the use of punch rotation based on temperature and strain rate dependent forming limit curves}, series = {International Journal of Material Forming}, volume = {15}, journal = {International Journal of Material Forming}, number = {3}, issn = {1960-6214}, doi = {10.1007/s12289-022-01684-6}, pages = {1 -- 21}, language = {en} } @misc{BesongBuhlBambach, author = {Besong, Lemopi Isidore and Buhl, Johannes and Bambach, Markus}, title = {Paddle shape optimization for hole-flanging by paddle forming through the use of a predefined strain path in finite element analysis}, series = {Journal of Machine Engineering}, volume = {Vol. 19}, journal = {Journal of Machine Engineering}, number = {2}, issn = {1895-7595}, doi = {10.5604/01.3001.0013.2226}, pages = {83 -- 98}, language = {en} }