Effects of Surface Roughness Microtopography on Formability in Cold Rolled Steel Sheet

2013 ◽  
Vol 690-693 ◽  
pp. 2232-2235
Author(s):  
Jing Tang
Keyword(s):  
Surface Roughness ◽  
Deformation Behavior ◽  
Rolled Sheet ◽  
Rolled Steel ◽  
Shot Blasting ◽  
Uniform Dispersion ◽  
Plastic Deformation Behavior ◽  
Before And After ◽  
Cold Rolled ◽  
Micro Topography

The surface roughness morphology of cold rolled sheet treated with three coarsen processes, including shot blasting texturing, electro-discharge texturing and laser texturing, was examined and analyzed before and after stamping. The influence of the micro-topography on the plastic deformation behavior during forming was then discussed. The results revealed that the sheet with uniform dispersion micro-pit, large concave valley and smooth convex hull exhibits a good forming performance.

The Research of ELID Grinding Effect and Surface Quality on Carbonized Cold-Rolled Steel

2012 ◽  
Vol 229-231 ◽  
pp. 542-546
Author(s):  
J.L. Guan ◽  
Li Li Zhu ◽  
H.W. Lu ◽  
Zhi Wei Wang
Keyword(s):  
Surface Roughness ◽  
Surface Quality ◽  
Grinding Wheel ◽  
Rolled Steel ◽  
Precision Grinding ◽  
Cold Rolled Steel ◽  
Elid Grinding ◽  
Peripheral Velocity ◽  
Ultra Precision ◽  
Cold Rolled

In this document, the electrolytic in-process dressing ( ELID ) grinding technique is used for ultra-precision processing experimental research on the carbonized cold-rolled steel (HRC60～80).A surface roughness of Ra6～8nm was obtained after ELID precision grinding. The results proved that adopting micro grain size (W1.5～W36) and high hardness cast iron based diamond grinding wheel, increasing the wheel peripheral velocity (18～20m/s) and reducing grinding depth can effectively improve surface quality and bring the surface roughness down. The wheel peripheral velocity, grinding depth as well as grinding fluid are the main factors during ultra-precision grinding.

Effects of Process Parameters on Surface Characteristics in Cutting of Cold Rolled Steel Sheets Using a High-Power CW Nd: YAG Laser

2008 ◽  
Vol 580-582 ◽  
pp. 455-458 ◽  
Author(s):  
Dong Gyu Ahn ◽  
Min Su Kim ◽  
Young Tae Yoo ◽  
Hyung Jun Park
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
High Power ◽  
Continuous Wave ◽  
Cutting Speed ◽  
Surface Characteristics ◽  
Rolled Steel ◽  
Cold Rolled Steel ◽  
Steel Sheets ◽  
Cold Rolled

The objective of the present paper is to examine the effects of process parameters, such as laser power, cutting speed of the laser and thickness of the workpiece, on characteristics of the cut section in the cutting of cold rolled steel sheets using a high-power Nd:YAG laser with a continuous wave (CW). From the results of the experiments, the influence of the process parameters on surface roughness and average striation angle has been quantitatively investigated. In addition, critical cutting speeds with a minimum surface roughness and a maximum average striation angle has been obtained. Finally, the optimum cutting conditions for each workpiece thickness have been estimated to improve both the quality of the cut section and the cutting efficiency.

scholarly journals Analysis of Light Reflection from Cold-rolled Steel Sheets and Its Application to On-line Measurement of Surface Roughness

1984 ◽  
Vol 70 (9) ◽  
pp. 1095-1102 ◽  
Author(s):  
Yuichiro ASANO ◽  
Motoji SHIOZUMI ◽  
Kunio KURITA ◽  
Tadashi YABE ◽  
Susumu MORIYA
Keyword(s):  
Surface Roughness ◽  
Light Reflection ◽  
Rolled Steel ◽  
Cold Rolled Steel ◽  
Steel Sheets ◽  
Line Measurement ◽  
On Line ◽  
Cold Rolled

Continuous Dry Cylindrical and Rectangular Deep Drawing by Electroconductive Ceramic Dies

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Kenji Tamaoki ◽  
Ken-ichi Manabe ◽  
Seiji Kataoka ◽  
Tatsuhiko Aizawa
Keyword(s):  
Surface Roughness ◽  
Deep Drawing ◽  
Rolled Steel ◽  
Contact Interface ◽  
Ceramic Tools ◽  
Steel Sheets ◽  
Cold Rolled ◽  
Cylindrical Cup ◽  
Cup Drawing

Two types of electroconductive ceramic tools are employed in this study to describe the dry deep drawing behavior of cold rolled steel sheets into cylindrical and rectangular cups. Each of electroconductive ceramic tools is machined by die sinking electric discharge. Four experimental setups are also prepared to investigate the effect of the surface roughness on the quality of dry deep drawing: the unlapped and the lapped electroconductive ceramic dies in dry condition and the unlubricated and the lubricated SKD11 die. Even without lubricating oils, cylindrical and rectangular cups are successfully deep drawn over 10,000 by the present tooling. Furthermore, compared to the lubricated SKD11 tooling, surface roughness of deep drawn cups is reduced by the present ceramic tooling. Fine finishing in ceramic tooling never leads to low surface roughness in the deep drawn cups since the work materials make unconstrained plastic flow in the direction of thickness. Hence, the unlapped electroconductive ceramic tooling is favored for practical ceramic tooling to preserve well-defined contact interface between metallic work sheets and ceramic tools in dry deep drawing. In addition, the rectangular cup drawing is evaluated by more severe conditions than the cylindrical cup drawing because the stress concentrates on the corner parts. Through this test, it is demonstrated that the electroconductive ceramic tooling has a potential of practical dry deep drawing.

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