| Autor: |
Chin-Nan CHEN, Chin-Hsi LIAO, Yunn-Shiuan LIAO |
| Jazyk: |
angličtina |
| Rok vydání: |
2013 |
| Předmět: |
|
| Zdroj: |
Journal of Advanced Mechanical Design, Systems, and Manufacturing, Vol 7, Iss 2, Pp 205-218 (2013) |
| Druh dokumentu: |
article |
| ISSN: |
1881-3054 |
| DOI: |
10.1299/jamdsm.7.205 |
| Popis: |
Thread cutting is one of the crucial machining procedures of mechanical processing. However, breakage of the nose of a threading tool is relatively common in fine-thread machining and directly related to the nose radius. The design concept of the unequal nose radius (UNR(1)) tool involves increasing the radii of the front teeth of a multi-point threading tool and maintaining the radius of the last tooth as the nose radius of the standard thread. This design can enhance the machining efficiency and remove burr. However, no method exists for determining the nose radius. Ideally, each tooth of a UNR multi-point threading tool should have approximately the same life span. Because the life of the tool is inversely proportional to the strain value, we proposed comparing the maximum strain value of each tooth to determine the nose radii. A recursive binary search was adopted for comparison. The best values were then gradually converged into a single solution to obtain the optimal nose radii combination. Considering a 3-point threading tool for example, the recursion results provided the optimal radii combination. The experiments confirmed that the machining efficiency of the 3-point threading tool was 15 times of that of a single-point threading tool. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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