The Effect of Residual Stresses on the Accuracy of Parts Processed by SPIF

Radu, Crina; Tâmpu, Cătălin; Cristea, Ion; Chirita, Bogdan

doi:10.1080/10426914.2013.763967

Cited by 41 publications

(20 citation statements)

References 12 publications

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“…Effect of the highest peak of the surface Sp on the variation of (a) axial and (b) tangential residual stresses in the outer surface of a drawpiece formed at step size ap = 0.5 mm. An increase in step size causes an increase in the axial (Figure 16a) and tangential (Figure 16b) residual stresses, as was also found by Radu et al [25] and Jimenez et al [46]. By increasing the tool step-down, the magnitude of the compressive residual stresses on the non-contact surface also increases when forming pyramidal drawpieces [17].…”

Section: Residual Stressessupporting

confidence: 72%

“…The results indicated compressive residual stresses with a magnitude that varies through the sheet thickness. In another paper, Radu et al [25] investigated the effect of residual stresses on the accuracy of parts processed by SPIF using the strain-rosette method. The results of the investigations revealed that a favorable state of residual stresses, and implicitly a good accuracy of parts, can be obtained when small values of tool diameter and vertical step sizes are used.…”

Section: Introductionmentioning

confidence: 99%

“…The results of the analyses reveal that the most significant parameter in the build-up of residual stress and the reduction of geometrical accuracy is the wall angle. Different strategies that analyze the intensity of the residual stresses and its effects on the accuracy of parts formed have been discussed in the literature [25,29].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Slota

Krasowski

Kubit

et al. 2020

Metals

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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.

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Section: Residual Stressessupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Slota

Krasowski

Kubit

et al. 2020

Metals

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show abstract

“…The hole drilling method was used to experimentally analyze the magnitude of the residual stresses. In another study, Radu et al [12] developed a cause-effect relationship between the process parameters, residual stresses, and the geometrical accuracy. They concluded that the residual stresses decrease by increasing the tool diameter and spindle speed, whereas the residual stresses increase by increasing the tool step-down and feed rate.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation of the Influence of Process Parameters in Incremental Sheet Metal Forming on Residual Stresses

Maqbool

Bambach�

2019

JMMP

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The aim of this study is to analyze the co-relation between the geometrical accuracy of parts formed by single-point incremental forming (SPIF) and the resulting distribution of the residual stresses induced in the material as a function of the different process parameters of the SPIF process. The study was performed for a pyramidal frustum manufactured by varying the process parameters of SPIF, i.e., tool diameter, tool step-down, and wall-angle. The hole-drilling strain gage method was used to determine the residual stresses in the manufactured pyramids. Further, small strips were laser cut from the pyramids, and the curvature of the strips was measured. The curvature of the strips is a result of the intensity and distribution of the residual stresses, which in turn depends on the selected values of the process parameters. A validated numerical model of SPIF was used to determine the residual stresses parallel and perpendicular to the direction of tool motion at the center of a strip cut from the numerical model in clamped, unclamped, and trimmed states. Further, the change in the bending moment of a strip that occurred upon unclamping and trimming was calculated. Experimental and numerical investigations reveal that the most significant parameter in residual stress build-up and the reduction of geometrical accuracy is the wall angle. Upon unclamping, the highest change in the residual stresses and bending moment occurred with the largest tool step-down and tool diameter. Upon trimming, the magnitude of the residual stresses and bending moment changed the most with the largest tool step-down in both directions, whereas the change was highest with the smallest tool diameter in the transverse direction of the tool motion. Furthermore, upon trimming, the geometric deviations were highest with the large wall angles in the transverse direction of the tool motion. Overall, the effect of changing process parameters on the residual stress state and geometrical accuracy was more pronounced in the transverse direction of the tool motion.

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“…Shrinkage was inevitable when the core pattern was too thick. To find out if the core dimension error is the main reason of the wall-thickness variation, the 3D laser scanner was used to measure the injected core pattern [14][15][16]. Then the error between a theoretical model and points cloud data is compared.…”

Section: Analysis Of Mechanism Of Core Deflectionmentioning

confidence: 99%