The effects of dub-off angle on chip evacuation in single-lip deep hole gun drilling
Without proper chip evacuation, gun drills will fail under intense thermal and mechanical loading during deep hole drilling of high temperature superalloys like Inconel 718. In gundrilling, the efficiency in evacuating chips is governed by the geometry of gun drills that defines the hydraulic bounda...
| Main Authors: | , , , |
|---|---|
| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2016
|
| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/84680 http://hdl.handle.net/10220/41932 |
| _version_ | 1824456136055586816 |
|---|---|
| author | Wan, S. Tnay, Guan Leong Woon, Keng Soon Yeo, Swee Hock |
| author2 | School of Mechanical and Aerospace Engineering |
| author_facet | School of Mechanical and Aerospace Engineering Wan, S. Tnay, Guan Leong Woon, Keng Soon Yeo, Swee Hock |
| author_sort | Wan, S. |
| collection | NTU |
| description | Without proper chip evacuation, gun drills will fail under intense thermal and mechanical loading during deep hole drilling of high temperature superalloys like Inconel 718. In gundrilling, the efficiency in evacuating chips is governed by the geometry of gun drills that defines the hydraulic boundary conditions for coolant and chip flow. In this paper, we propose a novel computational fluid dynamics (CFD) model that is capable to simulate and quantify the chip transportation behavior under high pressure coolant for drill geometry optimization. This is demonstrated through a case study on improving the shoulder dub-off design of commercial gun drills, which have a high tendency in trapping chips at the hole bottom. A more effective design criterion for the shoulder dub-off is thus proposed. |
| first_indexed | 2025-02-19T03:49:18Z |
| format | Journal Article |
| id | ntu-10356/84680 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:49:18Z |
| publishDate | 2016 |
| record_format | dspace |
| spelling | ntu-10356/846802023-03-04T17:12:08Z The effects of dub-off angle on chip evacuation in single-lip deep hole gun drilling Wan, S. Tnay, Guan Leong Woon, Keng Soon Yeo, Swee Hock School of Mechanical and Aerospace Engineering A*STAR SIMTech Deep hole gundrilling Chip evacuation Without proper chip evacuation, gun drills will fail under intense thermal and mechanical loading during deep hole drilling of high temperature superalloys like Inconel 718. In gundrilling, the efficiency in evacuating chips is governed by the geometry of gun drills that defines the hydraulic boundary conditions for coolant and chip flow. In this paper, we propose a novel computational fluid dynamics (CFD) model that is capable to simulate and quantify the chip transportation behavior under high pressure coolant for drill geometry optimization. This is demonstrated through a case study on improving the shoulder dub-off design of commercial gun drills, which have a high tendency in trapping chips at the hole bottom. A more effective design criterion for the shoulder dub-off is thus proposed. Accepted version 2016-12-22T07:43:15Z 2019-12-06T15:49:24Z 2016-12-22T07:43:15Z 2019-12-06T15:49:24Z 2016 Journal Article Tnay, G. L., Wan, S., Woon, K. S., & Yeo, S. H. (2016). The effects of dub-off angle on chip evacuation in single-lip deep hole gun drilling. International Journal of Machine Tools and Manufacture, 108, 66-73. 0890-6955 https://hdl.handle.net/10356/84680 http://hdl.handle.net/10220/41932 10.1016/j.ijmachtools.2016.05.008 en International Journal of Machine Tools and Manufacture © 2016 Elsevier. This is the author created version of a work that has been peer reviewed and accepted for publication by International Journal of Machine Tools and Manufacture, Elsevier. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.ijmachtools.2016.05.008]. 19 p. application/pdf |
| spellingShingle | Deep hole gundrilling Chip evacuation Wan, S. Tnay, Guan Leong Woon, Keng Soon Yeo, Swee Hock The effects of dub-off angle on chip evacuation in single-lip deep hole gun drilling |
| title | The effects of dub-off angle on chip evacuation in single-lip deep hole gun drilling |
| title_full | The effects of dub-off angle on chip evacuation in single-lip deep hole gun drilling |
| title_fullStr | The effects of dub-off angle on chip evacuation in single-lip deep hole gun drilling |
| title_full_unstemmed | The effects of dub-off angle on chip evacuation in single-lip deep hole gun drilling |
| title_short | The effects of dub-off angle on chip evacuation in single-lip deep hole gun drilling |
| title_sort | effects of dub off angle on chip evacuation in single lip deep hole gun drilling |
| topic | Deep hole gundrilling Chip evacuation |
| url | https://hdl.handle.net/10356/84680 http://hdl.handle.net/10220/41932 |
| work_keys_str_mv | AT wans theeffectsofduboffangleonchipevacuationinsinglelipdeepholegundrilling AT tnayguanleong theeffectsofduboffangleonchipevacuationinsinglelipdeepholegundrilling AT woonkengsoon theeffectsofduboffangleonchipevacuationinsinglelipdeepholegundrilling AT yeosweehock theeffectsofduboffangleonchipevacuationinsinglelipdeepholegundrilling AT wans effectsofduboffangleonchipevacuationinsinglelipdeepholegundrilling AT tnayguanleong effectsofduboffangleonchipevacuationinsinglelipdeepholegundrilling AT woonkengsoon effectsofduboffangleonchipevacuationinsinglelipdeepholegundrilling AT yeosweehock effectsofduboffangleonchipevacuationinsinglelipdeepholegundrilling |