Quality assessment of pressed joints of heat-exchanger tube-tube sheets

Terekhov, Viktor; Khizhov, Mikhail; Mironova, Lubov

doi:10.1016/j.matpr.2020.08.099

Cited by 4 publications

(2 citation statements)

References 3 publications

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“…2 Large-scale heat exchanger tube sheets with over 10,000 tube holes require strict dimensional control. 3 Therefore, nickel-based alloy laminated tube sheets are typically machined using Boring and Trepanning Association (BTA) deep hole drilling. 4 This method provides lubrication, reduces thermal loads and removes chips, making it suitable for processing difficult-to-cut materials with high process reliability and tight manufacturing tolerances.…”

Section: Introductionmentioning

confidence: 99%

Wear prediction of BTA drill based on finite element method for drilling laminated Inconel 625 deposited metal and FeCr alloy material

Guan

Lü

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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This study investigated the wear prediction of BTA drills for laminated Inconel 625 deposited metal and FeCr alloy materials using 3D finite element modelling. High interface temperature owing to increased cutting speed enhances the abrasive wear mechanism of Inconel 625, while FeCr alloy exhibits a predominantly adhesive wear mechanism. The interface temperature and normal pressure required as inputs for tool-wear prediction were obtained using response surface methodology (RSM), which was developed by combining the central composite design (CCD) with finite element method simulation. This approach significantly improved the computational efficiency and provides accurate predictions with the calibrated friction model. A modified Usui wear model was established considering the sensitivity of temperature to wear rate for Inconel 625. A significant improvement in prediction accuracy was observed compared with the original Usui equation. The proposed tool-wear prediction model was validated through experimental tests. The maximum predicted flank wear width deviations for the outer and intermediate edges of BTA drill were 2% and 7%, respectively. The results demonstrate the effectiveness of the proposed BTA drill wear-prediction approach for laminated materials with different wear characteristics, providing theoretical guidance for cutting-parameter optimisation and tool-replacement strategies.

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Section: Introductionmentioning

confidence: 99%

Wear prediction of BTA drill based on finite element method for drilling laminated Inconel 625 deposited metal and FeCr alloy material

Guan

Lü

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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show abstract

“…Up to date, a lot of works are focused on the study of the heat-exchanging tube bundle strength subject to the specifics of the manufacture and assembly processes. Tube-totubesheet fixation methods, evaluation of the residual stress-strain state of fixing points and their quality are widely covered in [2][3][4][5][6][7]. However, the use of finned heat-exchanging tubes of various designs requires new thermal and hydraulic and aerodynamic studies to determine the optimal dimensions and number of fins, as well as the choice of materials that ensure the up-state of heat-exchanger for the specified service life of all the equipment.…”

mentioning

confidence: 99%