scholarly journals Residual Stresses and Surface Roughness Analysis of Truncated Cones of Steel Sheet Made by Single Point Incremental Forming

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 237 ◽  
Author(s):  
Ján Slota ◽  
Bogdan Krasowski ◽  
Andrzej Kubit ◽  
Tomasz Trzepiecinski ◽  
Wojciech Bochnowski ◽  
...  
Keyword(s):  
Residual Stress ◽  
Steel Sheet ◽  
Incremental Forming ◽  
Single Point ◽  
Testing Machine ◽  
Slope Angle ◽  
Diffraction Method ◽  
Uniaxial Tensile ◽  
Stress Profile ◽  
Single Point Incremental Forming

The dimensional accuracy and mechanical properties of metal components formed by the Single Point Incremental Forming (SPIF) process are greatly affected by the prevailing state of residual stress. An X-ray diffraction method has been applied to achieve an understanding of the residual stress formation caused by the SPIF process of deep drawing a quality steel sheet drawpiece. The test object for an analysis of residual stress distribution was a conical truncated drawpiece with a slope angle of 71° and base diameter of the cone of 65 mm. The forming process has been carried out on a 3-axis HAAS TM1P milling machine. Uniaxial tensile tests have been carried out in the universal tensile testing machine to characterize the material tested. It was found that the inner surface of the drawpiece revealed small linear grooves as a result of the interaction of the tool tip with the workpiece. By contrast, the outer surface was free of grooves which are a source of premature cracking. The stress profile exhibits a nonlinear distribution due to different strengthening of the material along the generating line of the truncated conical drawpiece. The SPIF parts experienced a maximum residual stress value of about 84.5 MPa.

Forming mechanisms-related residual stress development in single point incremental forming

2018 ◽  
Vol 13 (2) ◽  
pp. 149-156 ◽  
Author(s):  
F. Maaß ◽  
M. Hahn ◽  
A. E. Tekkaya ◽  
M. Dobecki ◽  
A. Poeche ◽  
...  
Keyword(s):  
Residual Stress ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Stress Development

Improvement of Formability in Single Point Incremental Forming of DP 1000 Steel by Induction Heating

2015 ◽  
Vol 794 ◽  
pp. 67-74
Author(s):  
Amar Al-Obaidi ◽  
Verena Kräusel ◽  
Dirk Landgrebe
Keyword(s):  
Induction Heating ◽  
Steel Sheet ◽  
Incremental Forming ◽  
Heating Temperature ◽  
Single Point ◽  
Operational Efficiency ◽  
Single Point Incremental Forming ◽  
Lower Side ◽  
Wall Angle ◽  
Optimum Heating

This paper provides results from experiments to improve formability of DP 1000 steel in forming a complex profiles in single point incremental forming with induction heating. High attention is rewarded to the straight effect of induction power and tool settings, in order to determine if the heating temperature is sufficient for raising the formability. The steel sheet is formed by a punch in the upper side and synchronized by induction heating for the sheet on the lower side. Investigations show a maximum achievable wall angle of 70°, which was accomplished at 20 kW induction power for the two formed shapes pyramid and cone. The operational efficiency improved by reducing both the forming time and the induction power required obtaining an optimum heating temperature for the sheet blank. The presented method can be used to increase the formability of difficult-to-form metals by using a simple setup.

An Investigated of Single Point Incremental Forming Formability

2014 ◽  
Vol 950 ◽  
pp. 96-100
Author(s):  
Kittiphat Rattanachan ◽  
Chatchapol Chungchoo
Keyword(s):  
Industrial Application ◽  
Steel Sheet ◽  
Incremental Forming ◽  
Single Point ◽  
Experimental Result ◽  
Incline Angle ◽  
Single Point Incremental Forming ◽  
Wall Surface ◽  
Surface Fracture

An industrial application of single point incremental forming (SPIF) process is dramatically increasing due to the flexibility and economically of the SPIF process. In this paper, the maximum wall’s incline angle without tearing of the SS400 steel formed sample was investigated as the SPIF formability. The SS400 steel sheet 0.8 mm thickness was formed into the 100 mm diameter cone shape with 90o, 75oand 60owall’s incline angle. The forming depth was progressed step by step until the cone wall surface fracture was occurred, then the experimental was stopped. The experimental result shown the formability limited of the SS400 steel sheet was approx. 60owall’s incline angle. This could be used as the initial utilized data in designing the single point incremental forming parts.

scholarly journals Influence of tool path strategies on the residual stress development in single point incremental forming

2019 ◽  
Vol 29 ◽  
pp. 53-58 ◽  
Author(s):  
Fabian Maaß ◽  
Marlon Hahn ◽  
Mateus Dobecki ◽  
E. Thannhäuser ◽  
A. Erman Tekkaya ◽  
...  
Keyword(s):  
Residual Stress ◽  
Tool Path ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Stress Development

scholarly journals Experimental Determination of Residual Stresses Generated by Single Point Incremental Forming of AlSi10Mg Sheets Produced Using SLM Additive Manufacturing Process

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2542 ◽  
Author(s):  
Cecilio López ◽  
Alex Elías-Zúñiga ◽  
Isaac Jiménez ◽  
Oscar Martínez-Romero ◽  
Héctor. R. Siller ◽  
...  
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Manufacturing Process ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
X Ray Diffraction ◽  
Variable Wall ◽  
Metallic Sample

This paper focuses on investigating the residual stress values associated with a part fabricated by Selective Laser Melting technology (SLM) when this is subjected further to forces on single point incremental forming (SPIF) operation of variable wall angle. The residual stresses induced by the SLM manufacturing process on the fabricated AlSi10Mg metallic sheets, as well as those produced during their forming SPIF operation were determined by X-ray diffraction (XRD) measurements. Significant residual stress levels of variation, positive or negative, along the metallic sample were observed because of the bending effects induced by the SPIF processes. It is also shown how the wall thickness varies along the additive manufactured SPIFed part as well as the morphology of the melting pools as a function of the deformation depth.

scholarly journals Interaction of Process Parameters, Forming Mechanisms, and Residual Stresses in Single Point Incremental Forming

Metals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 656 ◽  
Author(s):  
Fabian Maaß ◽  
Marlon Hahn ◽  
A. Erman Tekkaya
Keyword(s):  
Mechanical Properties ◽  
Residual Stress ◽  
Stress State ◽  
Residual Stresses ◽  
Process Parameters ◽  
Process Model ◽  
Incremental Forming ◽  
Single Point ◽  
Single Point Incremental Forming ◽  
Residual Stress State

The residual stress state of a sheet metal component manufactured by metal forming has a significant influence on the mechanical properties, and thus determines the time until the component fails, especially for dynamic loads. The origin of the resulting residual stress state of incrementally formed parts with regard to the forming mechanisms of shearing, bending, and the normal stress component is still under investigation. The relationship between the process parameters, the forming mechanisms, and the resulting residual stress state for a complex part geometry manufactured by single point incremental forming (SPIF) is presented in this publication. For this purpose, a validated numerical process model is used to analyze the influence of the step-down increment Δz for truncated cones on the characteristics of the forming mechanisms and the resulting residual stress state. For the first time the forming mechanisms are evaluated numerically on both sides of the formed component. A relationship between the process parameters, forming mechanisms, residual stresses, and the mechanical properties of an incrementally formed component is shown. Shearing-induced hardening is identified as a relevant influence on the residual stress state of cones.

scholarly journals Numerical Study about the Influence of Wall Angle about Main Strains, Thickness Reduction and Forces on Single Point Incremental Forming Process

2016 ◽  
Vol 68 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Valentin Oleksik
Keyword(s):  
Incremental Forming ◽  
Numerical Study ◽  
Single Point ◽  
Testing Machine ◽  
Thickness Reduction ◽  
Single Point Incremental Forming ◽  
Forming Process ◽  
Wall Angle ◽  
Traction Test ◽  
Explicit Dynamic

Abstract The current paper aims to study, using numerical simulation, the influence of the wall angle on the single point incremental forming process. For the analysis there has been used the LS-Dyna software and three explicit dynamic analyses were run for three parts with wall angles of 450, 550 and 650. The factors taken into account are the main strains, the thickness reduction and the forces on three directions. The material data introduced into the simulation were determined based on an uniaxial traction test on an Instron 5587 testing machine and the Aramis system was used as optical extensometer.

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