Bibliographic Details
| Title: |
EXPERIMENTAL AND NUMERICAL ANALYSIS OF COINING PROCESS USING MICROFORMING APPROACH. |
| Alternate Title: |
Eksperimentalna i numerička analiza plitkog gravurnog kovanja kao procesa mikrooblikovanja. |
| Authors: |
Keran, Zdenka1 zdenka.keran@fsb.hr, Math, Miljenko1 miljenko.math@fsb.hr, Grizelj, Branko2 Branko.Grizelj@sfsb.hr |
| Source: |
Technical Gazette / Tehnički Vjesnik. Oct-Dec2011, Vol. 18 Issue 4, p505-510. 6p. |
| Subjects: |
Microforms, Numerical analysis, Parameter estimation, Friction, Statistical correlation, Particle size distribution, Physics experiments |
| Abstract (English): |
This study concerns the analysis of significant changes of process parameters in a coining process when dealing with different grain sizes. A reason for these changes can be found if the coining process is understood as a microforming process. Using that approach a few problems are explained and solved: large elastic springback, insufficient die filling, significant enlargement of total forming force, changes in friction factor. An experimental research provided data about percentage of elastic springback in total high reduction during coining process of Al 99,5 in three grain sizes. An experiment also included microscopic observation of gravure filling. The final result is a correlation between grain sizes and elastic springback, and also a correlation between grain sizes and gravure filling for different forming forces. Using experimental data in the creation of numerical FE (finite element) model, the dependence of contact friction changes in correlation to the change of the grain size is presented. Physical interpretation of the results is given by the theory of Bowden and Tabor. [ABSTRACT FROM AUTHOR] |
| Abstract (Croatian): |
Istraživanje obuhvaća analizu značajnih promjena parametara procesa plitkog gravurnog kovanja pri promjeni dimenzije kristalnog zrna materijala. Razlog ovih promjena može se pronaći ako spomenuti proces promatramo kao proces mikrooblikovanja. Korištenjem ovog pristupa nekoliko problema može biti objašnjeno i riješeno: veliki elastični povrat, nedostatno ispunjavanje gravure, značajno povećanje sile oblikovanja, promjene faktora trenja. Eksperimentalno istraživanja dalo je podatke o udjelu elastične deformacije u ukupnoj deformaciji tijekom plitkog gravurnog kovanja Al 99,5 u tri dimenzije zrna. Eksperiment je uključio i mikroskopsko promatranje ispunjavanja gravure. Konačni rezultat jest međuzavisnost dimenzije zrna i elastičnog povrata te dimenzije zrna i popunjenosti gravure za različite sile oblikovanja. Korištenjem eksperimentalnih podataka kreiranje numerički model kojim je dobivena ovisnost promjene faktora trenjao promjeni dimenzije kristahiog zrna. Fizikahia interpretacija ovih rezultata načinjenajepremaBowdenTaborovoj teoriji. [ABSTRACT FROM AUTHOR] |
|
Copyright of Technical Gazette / Tehnički Vjesnik is the property of Tehnicki Vjesnik and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
| Database: |
Engineering Source |
