Influence of Cold-Rolling Processes on the Dimensional Accuracy and Roughness of Small-Diameter Thick-Walled Seamless Tubes
Cold pilgering is widely utilized in high-end applications for the precise shaping of seamless tubes due to its capacity for large deformation, which reduces the number of deformation processes and shortens production cycles. However, there is a gap in the research on the cold pilgering of small-dia...
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2024-11-01
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| author | Xiuping Ding Ran Li Pengfei Jin Weijie Wang Cheng Zhang Minyu Ma Jinfeng Huang |
| author_facet | Xiuping Ding Ran Li Pengfei Jin Weijie Wang Cheng Zhang Minyu Ma Jinfeng Huang |
| author_sort | Xiuping Ding |
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| description | Cold pilgering is widely utilized in high-end applications for the precise shaping of seamless tubes due to its capacity for large deformation, which reduces the number of deformation processes and shortens production cycles. However, there is a gap in the research on the cold pilgering of small-diameter, thick-walled seamless tubes, specifically those with an outer diameter–wall thickness ratio of ≤3. In this study, cold pilgering tests were performed on Cr-Mo-V hot-working die steel small-diameter thick-walled tubes. It was discovered that increasing the feed rate results in greater deviations in both inner diameter and wall thickness, although it has little effect on inner wall roughness. In contrast, increasing wall thickness reduction leads to higher wall thickness deviation but reduces inner surface roughness without significantly affecting inner diameter deviation. The study also found that a decrease in the initial inner wall roughness before pilgering results in improved final roughness. Under optimal conditions, the average inner surface roughness <i>S<sub>a</sub></i> can reach 0.177 μm, and small-diameter thick-walled seamless tubes with deviations in the inner diameter and wall thickness of 0.05 mm and 0.03 mm, respectively, are obtained. After tempering at 600 °C, the tensile strength (<i>R</i><sub>m</sub>) and yield strength (<i>R</i><sub>p0</sub>.<sub>2</sub>) of the cold-pilgered tube reach 1092 MPa and 947 MPa, respectively, and the elongation (<i>δ</i><sub>5</sub>%) and impact energy (<i>A</i><sub>kU</sub>) increase to 20.4% and 61.5 J, respectively. |
| format | Article |
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| language | English |
| publishDate | 2024-11-01 |
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| series | Metals |
| spelling | doaj-art-68df0a3969cf4bb883aae272c6e7a3b92025-08-20T01:54:07ZengMDPI AGMetals2075-47012024-11-011411129710.3390/met14111297Influence of Cold-Rolling Processes on the Dimensional Accuracy and Roughness of Small-Diameter Thick-Walled Seamless TubesXiuping Ding0Ran Li1Pengfei Jin2Weijie Wang3Cheng Zhang4Minyu Ma5Jinfeng Huang6State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaHBIS Group Research Institute, Shijiazhuang 050018, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaCollege of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, ChinaState Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, ChinaCold pilgering is widely utilized in high-end applications for the precise shaping of seamless tubes due to its capacity for large deformation, which reduces the number of deformation processes and shortens production cycles. However, there is a gap in the research on the cold pilgering of small-diameter, thick-walled seamless tubes, specifically those with an outer diameter–wall thickness ratio of ≤3. In this study, cold pilgering tests were performed on Cr-Mo-V hot-working die steel small-diameter thick-walled tubes. It was discovered that increasing the feed rate results in greater deviations in both inner diameter and wall thickness, although it has little effect on inner wall roughness. In contrast, increasing wall thickness reduction leads to higher wall thickness deviation but reduces inner surface roughness without significantly affecting inner diameter deviation. The study also found that a decrease in the initial inner wall roughness before pilgering results in improved final roughness. Under optimal conditions, the average inner surface roughness <i>S<sub>a</sub></i> can reach 0.177 μm, and small-diameter thick-walled seamless tubes with deviations in the inner diameter and wall thickness of 0.05 mm and 0.03 mm, respectively, are obtained. After tempering at 600 °C, the tensile strength (<i>R</i><sub>m</sub>) and yield strength (<i>R</i><sub>p0</sub>.<sub>2</sub>) of the cold-pilgered tube reach 1092 MPa and 947 MPa, respectively, and the elongation (<i>δ</i><sub>5</sub>%) and impact energy (<i>A</i><sub>kU</sub>) increase to 20.4% and 61.5 J, respectively.https://www.mdpi.com/2075-4701/14/11/1297cold pilgeringsurface roughnessmechanical properties |
| spellingShingle | Xiuping Ding Ran Li Pengfei Jin Weijie Wang Cheng Zhang Minyu Ma Jinfeng Huang Influence of Cold-Rolling Processes on the Dimensional Accuracy and Roughness of Small-Diameter Thick-Walled Seamless Tubes Metals cold pilgering surface roughness mechanical properties |
| title | Influence of Cold-Rolling Processes on the Dimensional Accuracy and Roughness of Small-Diameter Thick-Walled Seamless Tubes |
| title_full | Influence of Cold-Rolling Processes on the Dimensional Accuracy and Roughness of Small-Diameter Thick-Walled Seamless Tubes |
| title_fullStr | Influence of Cold-Rolling Processes on the Dimensional Accuracy and Roughness of Small-Diameter Thick-Walled Seamless Tubes |
| title_full_unstemmed | Influence of Cold-Rolling Processes on the Dimensional Accuracy and Roughness of Small-Diameter Thick-Walled Seamless Tubes |
| title_short | Influence of Cold-Rolling Processes on the Dimensional Accuracy and Roughness of Small-Diameter Thick-Walled Seamless Tubes |
| title_sort | influence of cold rolling processes on the dimensional accuracy and roughness of small diameter thick walled seamless tubes |
| topic | cold pilgering surface roughness mechanical properties |
| url | https://www.mdpi.com/2075-4701/14/11/1297 |
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