21112 High-Precision Forming Simulations Considering the Differential Work Hardening Behavior of Cold-Rolled IF Steel Sheets (original) (raw)
2014, The Proceedings of Conference of Kanto Branch
Related papers
工作物剛性の低下を伴うエンドミル加工における工作物変形挙動のモデル化
Transactions of the JSME (in Japanese)
Workpiece rigidity during end-milling processes decreases monotonously. Reduction rates of the rigidity become large when the end-milling operations have large cutting stock such as carve out machining. It becomes popular to utilize side-face clamping methods because of large accessibility of cutting tools. However, workpiece rigidities directly affect to clamping force and workpiece deformation when workpieces are clamped with side-face clamping method. This research deals with transitional workpiece deformations considering workpiece rigidity reduction. At first, measured results of clamping force reduction during machining operations are investigated. Secondly, measured workpiece profiles during machining operations are investigated. Finally, FEM analysis of workpiece deformation considering workpiece change is discussed. From the results of the evaluation, it becomes clear that it is necessary to consider the influence of transitional workpiece rigidity to achieve reliable estimation of machining accuracy.
Continuous resistivity fluctuation of rolled Al-Mg-Si-Cu alloy sheets
Journal of Japan Institute of Light Metals, 2005
To study the bake-hardening behavior of Cu added Al-1%Mg 2 Si alloys by the tensile test after resistivity measurement, resistivity of many samples taken from a rolled sheet was measured in various stages of heat treatment. The resistivity r STQ in the 848 K-3.6 ks solution treated and water quenched state STQ fluctuated within ranges of 0.9 to 1.7 nW m. There were good linear relations between the r STQ and resistivity after room temperature pre-aging for 1 day r RTP for each of four alloys. The r RTP values were maintained after short period final aging at 448 K. Possible causes of the fluctuation in r were checked. Effects of the STQ conditions on the r STQ were negligible. Because the Matthiessen plot of the r RTP gave good straight lines having acceptable gradient, the fluctuation is not due to errors in size factor and resistance. Change in room temperature showed no correlation with increment up to the r RTP. Therefore, it is concluded that the r STQ of rolled plates used in a series of study have a stripe shaped distribution of the r STQ ranging Ϯ0.25 to 0.5 nW m in the transverse direction with width of 10 to 20 mm extending about 360 mm in the longitudinal direction. In a rough estimation, this fluctuation in r is corresponding to variation in Mg, Si or Cu contents of Ϯ0.05 to 0.15 mass% from analysed compositions, though the species of alloying elements is not clear.
Loading Preview
Sorry, preview is currently unavailable. You can download the paper by clicking the button above.