Robot-Assisted Cold and Warm Incremental Sheet Forming of Aluminum Alloy 6061: A Comparative Study

Incremental sheet forming (ISF) requires no or partial dies for sheet metal fabrication and is widely used for small batch production. In this process, necking is either suppressed or delayed due to the localized nature of tool–sheet contact; hence, more strains than conventional stamping and deep drawing are obtained. In the present study, two variations of ISF, namely cold ISF (CISF) and warm ISF (WISF), are compared. First, FEA modeling is carried out on ABAQUS to reach the forming forces involved in the process. It is found that WISF reduces the forming forces. The temperature for WISF is maintained at 180 °C. Following the simulation analysis, tests are carried out. The forming force in WISF is 55.77% less than that in CISF. The part fabricated by CISF is slightly more substantial than that by WISF; however, more forming depth can be achieved by WISF. There is a more uniform thickness distribution in the case of CISF than in WISF. However, the surface quality of the CISF product is inferior to that of WISF. It is observed that there is reduced forming force, increased formability, and better strain distribution in WISF compared to CISF. However, post-processing heat treatment and surface polishing of the formed parts is required to restore their mechanical properties.

[1]  R. Mohanraj,et al.  Experimental investigations of warm incremental sheet forming process on magnesium AZ31 and aluminium 6061 alloy , 2022, Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications.

[2]  Swadesh Kumar Singh,et al.  Heat treatment and temperature effects on formability of AA2014-T6 in incremental forming , 2021, Materials and Manufacturing Processes.

[3]  J. Kim,et al.  Dissimilar Materials Welding with a Standoff-Free Vaporizing Foil Actuator between TRIP 1180 Steel Sheets and AA5052 Alloy , 2021, Materials.

[4]  S. Gupta,et al.  Robot assisted incremental sheet forming of Al6061 under static pressure: Preliminary study of thickness distribution within the deformation region , 2021 .

[5]  Pavan Kumar,et al.  Process capabilities of commercially pure titanium grade 2 formed through warm incremental sheet forming , 2021 .

[6]  S. P. Regalla,et al.  Effect of inclination and rotation of the sheet on sheet thinning and formability in robot assisted incremental sheet metal forming , 2021 .

[7]  P. Tandon,et al.  Comparative Study of Incremental Forming and Elevated Temperature Incremental Forming Through Experimental Investigations on AA 1050 Sheet , 2020, Journal of Manufacturing Science and Engineering.

[8]  G. Tang,et al.  Experimental investigation on the springback of AZ31B Mg alloys in warm incremental sheet forming assisted with oil bath heating , 2020 .

[9]  G. Tang,et al.  Evaluation and optimization on the formability of an AZ31B Mg alloy during warm incremental sheet forming assisted with oil bath heating , 2020 .

[10]  H. Jrad,et al.  Homogenization of elasto-plastic functionally graded material based on representative volume element: Application to incremental forming process , 2019, International Journal of Mechanical Sciences.

[11]  Y. V. Daseswara Rao,et al.  Robot-assisted incremental sheet metal forming under the different forming condition , 2019, Journal of the Brazilian Society of Mechanical Sciences and Engineering.

[12]  S. Sulaiman,et al.  Effect of process parameters on the surface roughness of aluminum alloy AA 6061-T6 sheets in frictional stir incremental forming , 2018, Advances in Production Engineering & Management.

[13]  H. Jrad,et al.  A non-associated anisotropic plasticity model with mixed isotropic–kinematic hardening for finite element simulation of incremental sheet metal forming process , 2018, The International Journal of Advanced Manufacturing Technology.

[14]  Srinivasa Prakash Regalla,et al.  Investigation of influence of part inclination and rotation on surface quality in robot assisted incremental sheet metal forming (RAISF) , 2018, CIRP Journal of Manufacturing Science and Technology.

[15]  A. Ghaei,et al.  An experimental study on dimensional accuracy, surface quality, and hardness of Ti-6Al-4 V titanium alloy sheet in hot incremental forming , 2016 .

[16]  Hengan Ou,et al.  Review on the influence of process parameters in incremental sheet forming , 2016 .

[17]  Dirk Landgrebe,et al.  Hot single-point incremental forming assisted by induction heating , 2016 .

[18]  Gianfranco Palumbo,et al.  Experimental investigations on the single point incremental forming of a titanium alloy component combining static heating with high tool rotation speed , 2012 .

[19]  Francesco Gagliardi,et al.  Formability of lightweight alloys by hot incremental sheet forming , 2012 .

[20]  Georg Bergweiler,et al.  Laser-assisted asymmetric incremental sheet forming of titanium sheet metal parts , 2011, Prod. Eng..

[21]  A. H. van den Boogaard,et al.  An overview of stabilizing deformation mechanisms in incremental sheet forming , 2009 .

[22]  Ghulam Hussain,et al.  Electric hot incremental forming: A novel technique , 2008 .

[23]  J. Park,et al.  A Study on the mechanics of shear spinning of cones , 2006 .

[24]  Jong-jin Park,et al.  Fundamental studies on the incremental sheet metal forming technique , 2003 .

[25]  J. J. Park,et al.  Effect of process parameters on formability in incremental forming of sheet metal , 2002 .

[26]  M. Shim,et al.  The formability of aluminum sheet in incremental forming , 2001 .

[27]  H. Iseki,et al.  An approximate deformation analysis and FEM analysis for the incremental bulging of sheet metal using a spherical roller , 2001 .

[28]  Dong-Yol Yang,et al.  Improvement of formability for the incremental sheet metal forming process , 2000 .

[29]  B. Saikiran,et al.  Optimizing the Heat Treatment Parameters of Al-6061 Required for Better Formability , 2018 .

[30]  Fakhreddine Dammak,et al.  Effects of the tool path strategies on incremental sheet metal forming process , 2016 .

[31]  A. Ghiotti,et al.  A novel experimental set-up for warm incremental forming of AZ31B magnesium alloy sheets , 2010 .

[32]  Johan Verbert,et al.  Laser Assisted Incremental Forming: Formability and Accuracy Improvement , 2007 .

[33]  Joost Duflou,et al.  Asymmetric single point incremental forming of sheet metal , 2005 .

[34]  Kazuo Ozaki,et al.  Flexible and Inclemental Sheet Metal Bulging Using a Few Spherical Rollers. , 1993 .