Experimental study of high-strength low-alloy sheet metal components with holes on the bending surfaces

Abstract

Bending is one of the processes frequently used in the manufacture of sheet metal components. Springback is an important issue in bending operations since it controls the final shape of the parts. Hence, exact estimation of its value is essential for die design operations. In industry, the springback is usually obtained from empirical equations or mostly from handbook tables. These equations or tables are mainly suitable for components that have no holes on the bending surfaces, and they cannot be used for parts with any holes on the bending surfaces. In the present work, the influence of holes and their sizes on the bending surfaces of the high-strength low-alloy (HSLA) sheet metal steel using V-shape dies is studied. Different die angles, die widths, and sheet metal thicknesses are used in the experiments. The results show that all these parameters have an effect on the springback and the bending force, but their effects are not similar. An equation is derived for determining the bending forces for parts with holes on the bending surfaces.

Keywords

V-bending bending force springback holes on bending surfaces

References

Huang

Y. M.

Chen

T. C.

, ‘Influence of blank profile on the V-die bending camber process of sheet metal’ Int. J. Adv. Mfg Technol. 25 (2005): 668–677.

Carden

W. D.

Geng

L. M.

Matlock

D. K.

Wagoner

R. H.

, ‘Measurement of springback’ Int. J. Mech. Sci. 44 (1) (2002): 79–101.

Fedin

Y. A.

Kharichkin

E. S.

, ‘Determining the spring-back angle and accuracy of parts made in bending dies’ J. Chem. and Petrol. Engng 10 (1974): 246–248.

Weinmann

K. J.

Shippell

R. J.

, Effect of tool and work piece geometries upon bending forces and springback in 90 degree V-die bending of HSLA steel platef.

Magnusson

Tan

, Mathematical modeling of V-die bending process.

Garcia-Romeu

M. L.

Ciurana

Ferrer

, ‘Springback determination of sheet metals in an air bending process based on an experimental work’ J. Mater. Process. Technol. 191 (2007): 174–177.

Cleveland

R. M.

Ghosh

A. K.

, ‘Inelastic effects on springback in metals’ Int J. Plasticity 18 (2002): 769–785.

Chun

B. K.

Jinn

J. T.

Lee

J. K.

, ‘Modeling the Bauschinger effect for sheet metals, part I: Theory’ Int. J. Plasticity 18 (2002): 571–595.

Chun

B. K.

Jinn

J. T.

Lee

J. K.

, ‘Modeling the Bauschinger effect for sheet metals, part II: Application’ Int. J. Plasticity 18 (2002): 597–616.

10.

D'Urso

Pellegrini

Maccarini

, ‘The effect of sheet and material properties on springback in air bending’ Key Engng Mater. 344 (2007): 277–284.

11.

Fei

Hodgson

, ‘Experimental and numerical studies of springback in air V-bending process for cold rolled TRIP steels’ Nucl. Engng. and Des. 236 (2006): 1847–1851.

12.

–zgu

R. T.

Ulvi

S. E.

O–zdemir

, ‘Determining springback amount of steel sheet metal of 0.5 mm thickness in bending dies’ Mater. and Des. 27 (2006): 251–258.

13.

Vukota

, Sheet metal forming processes and die design (New York: Industrial Press 2004).

14.

Inamdar

M. P.

Date

Narasimhan

K. S.

Maitil

Singh

U. P.

, ‘Development of an artificial neural network to predict springback in air V-bending’ Int. J. Adv. Mfg Technol. 16 (2000): 376–381.

15.

Roy

, ‘Assessment of sheet-metal bending requirements using neural networks.’ Neural Comput. and Applic. 4 (1996): 35–43.

16.

Marciniak

Duncan

J. L.

S. J.

, Mechanics of sheet metal forming (GB: Butterworth Heinemann 2002).

17.

Suchy

, Handbook of die design (USA: McGraw-Hill 2006): Pp. 363–366.