Novel experimental set-up to investigate the wear of coatings for sheet metal forming tools

2014 ◽  
Vol 8 (4) ◽  
pp. 581-589 ◽  
Author(s):  
A. Ghiotti ◽  
S. Bruschi ◽  
F. Sgarabotto
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Set Up ◽  
Forming Tools

Novel Experimental Set-Up to Investigate the Wear of Coatings for Sheet Metal Forming Tools

2013 ◽  
Vol 554-557 ◽  
pp. 825-832 ◽  
Author(s):  
Francesco Sgarabotto ◽  
Andrea Ghiotti ◽  
Stefania Bruschi
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
The Novel ◽  
Reference Case ◽  
Testing Procedures ◽  
Optimization Of Process Parameters ◽  
Set Up ◽  
Deformation Step ◽  
Forming Tools

The use of PVD and CVD coatings has increased significantly thanks to the improved tribological performances they offer in many metalforming processes. Nevertheless the proper coating selection for a specific forming operation is not well established yet, being mainly based on trails and error approaches. The use of FEM-supported analyses may represent an effective support in the optimization of process parameters, but the need of testing procedures and reliable models to describe the mechanical and tribological phenomena at the interface between the dies and the workpiece is still significant. The paper presents a novel experimental set-up for the evaluation of the wear resistance of dies coatings in sheet metal forming operations. A progressive stamping process was taken as reference case and analyzed by numerical analyses. Contact pressures, temperatures and tangential loads at the tools-blank interface were evaluated in each deformation step. TiAlN and CrN were selected as reference coatings and deposited via magnetron sputtering technique. The first part of the research was focused on the design of the novel set-up capable to carry out controlled wear tests in laboratory environment, performed with the parameters obtained from the numerical simulation. The results of such experiments were compared to the ones from standard laboratory tests and with industrial trials, though measurements of loads, of surface roughness evolution and by surface investigations trough Scanning Electron Microscope observations.

Tribological Behaviour of PVD Coatings for Sheet Metal Forming Tools: Laboratory and Industrial Evaluation

2012 ◽  
Vol 504-506 ◽  
pp. 543-548 ◽  
Author(s):  
Francesco Sgarabotto ◽  
Andrea Ghiotti
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Vapour Deposition ◽  
New Technology ◽  
Research Work ◽  
Chemical Vapour ◽  
Tribological Behaviour ◽  
Wide Range ◽  
Forming Tools

In the last decades, Physical Vapour Deposition (PVD) and Chemical Vapour Deposition (CVD) processes have been significantly improved and optimized for the applications on dies for sheet metal forming processes. However, due to the different contact conditions at dies-blank interfaces, and the wide range of applied contact pressures, the selection of the correct coating may be still affected by trials-and-error approaches. Although many methods to evaluate the tribological performances of such coatings can be found in scientific literature, they often suffer of limitations in reproducing the interface conditions typical of industrial processes. The objective of the present research work is to investigate the tribological behaviour of two coatings deposited by PVD magnetron sputtering technique. Both investigations in laboratory and industrial conditions were performed: the former to evaluate their tribological characteristics, the latter to test the performances of coatings in production lines. The results, in terms of wear resistance, outline the comparison of the new technology with the performances of traditional dies.

A Method for Determination of Friction Coefficient in Sheet Metal Forming of Magnesium Alloy

2012 ◽  
Vol 268-270 ◽  
pp. 430-435 ◽  
Author(s):  
Xin Wu Ma ◽  
Guo Qun Zhao ◽  
Wen Juan Li
Keyword(s):  
Friction Coefficient ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Dimensional Change ◽  
Analysis Model ◽  
Calibration Curves ◽  
Set Up ◽  
Friction Calibration

A new method for determination of friction coefficient in sheet metal forming of Mg alloy AZ31B is presented in this paper. The method is based on the bulging test of sheet metal in which the specimen is processed with a hole at the center. The diameter of the hole will increase along the stroke of the punch and the dimensional change of the hole has a certain relationship with the friction coefficient at the punch/specimen interface. Thus, the friction coefficient can be determined indirectly according to the dimension of the hole in the bulging process. The bulging process of the sheet is simulated using FE code DEFORM-2D. The analysis model is set up according to the experiment of the bulging and the friction calibration curves are generated from the simulations of the bulging by setting different coefficients of friction. The friction coefficient can be determined by measuring the hole dimension during the bulging process and comparing it with the friction calibration curves.

A new approach to determine the wear coefficient for wear prediction of sheet metal forming tools

2007 ◽  
Vol 1 (4) ◽  
pp. 357-363 ◽  
Author(s):  
H. Hoffmann ◽  
G. Nürnberg ◽  
K. Ersoy-Nürnberg ◽  
G. Herrmann
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Wear Coefficient ◽  
Wear Prediction ◽  
New Approach ◽  
Forming Tools

Customizing Procedure of Finite Element Analysis for Sheet Metal Forming

2014 ◽  
Vol 933 ◽  
pp. 212-215
Author(s):  
Xu Dong Xu ◽  
Guang Jun Li ◽  
Zhan Chong Wei ◽  
Fang Xue Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Model Building ◽  
Element Analysis ◽  
Standardization Procedure ◽  
Set Up

Based on Pam-Stamp software platform, standardization procedure of finite element analysis for sheet metal forming was customized by set up module such as model building, meshing, setting of boundary conditions, calculation submitting, viewing of results and report generating. Standardization procedure has been successfully applied in the development of new products, which shortens the preparation cycle of procedure, improves the forming quality of the parts and enhances the capability for rapidly researching and developing.

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