Effect of multiple forming tools on geometrical and mechanical properties in incremental sheet forming

2018 ◽  
Author(s):  
S. Wernicke ◽  
T. Dang ◽  
S. Gies ◽  
A. E. Tekkaya
Keyword(s):  
Mechanical Properties ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Forming Tools

Tool Directionality in Contour-Based Incremental Sheet Forming: an Experimental Study on Product Properties and Formability

2011 ◽  
Vol 473 ◽  
pp. 897-904 ◽  
Author(s):  
Philip Eyckens ◽  
Hans Vanhove ◽  
Albert Van Bael ◽  
Joost R. Duflou ◽  
Paul van Houtte
Keyword(s):  
Mechanical Properties ◽  
Tool Path ◽  
Thickness Distribution ◽  
Low Carbon Steel ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Movement Direction ◽  
Low Carbon ◽  
Wall Angle ◽  
Product Thickness

The Incremental Sheet Forming (ISF) process offers a large variety in tool path strategies to obtain a particular final product shape. As fundamental understanding of the relevant deformation modes in ISF is growing, the selection of the tool path strategy may be shifted from trial-and-error towards more fundamentally based knowledge of the process characteristics. Truncated cones and pyramids have been fabricated by both unidirectional (UD) and bidirectional (BD) contour-based tool path strategies, considering different wall angles and materials (Mn-Fe alloyed aluminum sheet and low carbon steel sheet). It is shown that the induced through-thickness shear along the tool movement direction is clearly non-zero for UD, in which case the sense of tool movement is the same for all contours, while it is close to 0 for BD, due to the alternating tool sense during consecutive contours. Furthermore, the heterogeneity in product thickness, as observed for the UD strategy in [1,2], is avoided by using the BD strategy. It is verified that this difference in deformation may affect the mechanical properties in the walls of pyramids by means of tensile testing, but the results are material-dependent. For the aluminum alloy, the re-yield stress along the tool movement direction is smaller for BD in comparison to UD, and the fracture strain in large wall angle products is higher. For the steel, no statistically significant differences in mechanical properties between UD- and BD-processed parts are observed. Finally, for both materials a (slightly) higher limiting wall angle has been repeatedly measured using the BD tool strategy. In light of these results, the bidirectional tool path strategy is to be preferred over the unidirectional one, as thickness distribution and formability are more favorable, while both strategies require similar resources and processing time.

scholarly journals Analysis of the Influence of Geometrical Parameters on the Mechanical Properties of Incremental Sheet Forming Parts

2013 ◽  
Vol 63 ◽  
pp. 445-453 ◽  
Author(s):  
J. León ◽  
D. Salcedo ◽  
C. Ciáurriz ◽  
C.J. Luis ◽  
J.P. Fuertes ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Geometrical Parameters

Investigations on Nanolaminated TiZrN/CrN as a Tribological PVD Hard Coating for Incremental Sheet Forming Tools

2009 ◽  
Vol 11 (8) ◽  
pp. 674-679 ◽  
Author(s):  
Kirsten Bobzin ◽  
Nazlim Bagcivan ◽  
Mara Ewering ◽  
Carsten Warnke
Keyword(s):  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Hard Coating ◽  
Forming Tools

scholarly journals Post-Forming Mechanical Properties of a Polymer Sheet Processed by Incremental Sheet Forming: Insights into Effects of Plastic Strain, and Orientation and Size of Specimen

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1870
Author(s):  
Hongyu Wei ◽  
Ghulam Hussain ◽  
Behzad Heidarshenas ◽  
Mohammed Alkahtani
Keyword(s):  
Mechanical Properties ◽  
Plastic Strain ◽  
Tensile Properties ◽  
Yield Stress ◽  
Polymer Structure ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Ultimate Stress ◽  
Polymer Sheet ◽  
Structural Tests

The innovative Incremental Sheet Forming (ISF) process affects the post-forming properties of thermoplastic polymers. However, the effects of degree of plastic strain, and the orientation and size of specimen on the mechanical properties are still unknown. In the present study, therefore, the ISF process is performed on a polymer sheet by varying the plastic strain ranging from 6% to 108%. The corresponding effects on the properties and associated polymer structure are quantified by conducting a variety of mechanical and structural tests. The results reveal that the post-ISF tensile properties like yield stress, ultimate stress, drawing stress, elastic modulus and elongation decrease from 26.6 to 10 MPa, 30.5 to 15.4 MPa, 18.9 to 9.9 MPa, 916 to 300 MPa and 1107% to 457%, respectively, as the strain increases in the investigated range. The value of post-ISF relaxation properties, contrary to the tensile properties, increases with increasing strain up to 62%. Particularly, reductions in stress, strain and modulus increase from 41% to 202%, 37% to 51%, and 41% to 202%. As regard the orientation effect, the sheet in the feed direction shows greater strength than the transverse direction (up to 142% in yield stress and 72% in ultimate stress). Moreover, the smaller sample offers greater strength than the larger one (up to 158% in yield stress and 109% in ultimate stress). The analysis of the post-ISF tensile properties and structural results lead us to conclude that the drop in the tensile properties due to increasing strain occurs due to corresponding increase in the voids area fraction (1.25% to 31%) and a reduction in the crystallinity (38% to 31%).

scholarly journals EFFECTS OF FORMING TOOLS AND PROCESS PARAMETERS ON SURFACE ROUGHNESS IN INCREMENTAL SHEET FORMING, A REVIEW

2018 ◽  
Vol 12 (3) ◽  
pp. 75-95 ◽  
Author(s):  
Umair Khalil ◽  
Haris Aziz ◽  
Mirza Jahanzaib ◽  
Wasim Ahmad ◽  
Salman Hussain ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Process Parameters ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Forming Tools

Multiobjective optimization of process variables in single-point incremental forming using grey relational analysis coupled with entropy weights

2021 ◽  
pp. 146442072110204
Author(s):  
Abdulmajeed Dabwan ◽  
Adham E Ragab ◽  
Mohamed A Saleh ◽  
Atef M Ghaleb ◽  
Mohamed Z Ramadan ◽  
...  
Keyword(s):  
Grey Relational Analysis ◽  
Incremental Forming ◽  
Single Point ◽  
Sheet Forming ◽  
Incremental Sheet Forming ◽  
Numerical Control ◽  
Single Point Incremental Forming ◽  
Process Variables ◽  
Relational Analysis ◽  
Grey Relational

Incremental sheet forming is a specific group of sheet forming methods that enable the manufacture of complex parts utilizing computer numerical control instead of specialized tools. It is an incredibly adaptable operation that involves minimal usage of sophisticated tools, dies, and forming presses. Besides its main application in the field of rapid prototyping, incremental sheet forming processes can be used for the manufacture of unique parts in small batches. The goal of this study is to broaden the knowledge of the deformation process in single-point incremental forming. This work studies the deformation behavior in single-point incremental forming by experimentally investigating the principal stresses, principal strains, and thinning of single-point incremental forming products. Conical-shaped components are fabricated using AA1050-H14 aluminum alloy at various combinations of fundamental variables. The factorial design is employed to plan the experimental study and analysis of variance is conducted to analyze the results. The grey relational analysis approach coupled with entropy weights is also implemented to identify optimum process variables for single-point incremental forming. The results show that the tool diameter has the greatest effect on the thinning of the SPIF product, followed by the sheet thickness, step size, and feed rate.

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