Finite element analysis of deformation characteristics in cold helical rolling of bearing steel-balls

Abstract

Due to the complexity of investigating deformation mechanisms in helical rolling (HR) process with traditional analytical method, it is significant to develop a 3D finite element (FE) model of HR process. The key forming conditions of cold HR of bearing steel-balls were detailedly described. Then, by taking steel-ball rolling elements of the B7008C angular contact ball bearing as an example, a completed 3D elastic-plastic FE model of cold HR forming process was established under SIMUFACT software environment. Furthermore, the deformation characteristics in HR process were discovered, including the forming process, evolution and distribution laws of strain, stress and damage based on Lemaitre relative damage model. The results reveal that the central loosening and cavity defects in HR process may have a combined effect of large negative hydrostatic pressure (positive mean stress) caused by multi-dimensional tensile stresses, high level transverse tensile stress, and circular-alternating shear stress in cross section.

Keywords

cold helical rolling / finite element (FE) simulation / rotary forming / bearing steel-balls

References

[1] HuZ-h, HuaLinTechnology of rotary metal forming [M], 2010, Beijing, Chemical Industry Press: 150-152

[2] WangQ-x, WangQ-p, XiaoJ-ming. Study on the method for groove design in the helical rolling of steel balls [J]. Journal of Materials Processing Technology, 1995, 55(3): 340-344

[3] ShiX-m, WangB-y, LiZ-hua. Optimization of pass parameters on two-grooves skew rolling for Al ball [J]. Key Engineering Materials, 2010, 419/420: 313-316

[4] ShiX-m, WangB-yu. Numerical simulation of Al ball forming process in skew rolling [J]. Materials Science Forum, 2012, 704/705: 151-154

[5] PaterZ, KazaneckiJ, TomczakJ. Helical-wedge rolling of steel balls [J]. Steel Research International, Special Edition: Metal Forming, 201279-82

[6] PaterZ, TomczakJ, BartnickiJ, LovellM R, MenezesP L. Experimental and numerical analysis of helical-wedge rolling process for producing steel balls [J]. International Journal of Machine Tools and Manufacture, 2013, 67: 1-7

[7] PaterZ. FEM analysis of helical rolling for producing steel balls [J]. Key Engineering Materials, 2014, 572: 525-528

[8] ZhouG, HuaL, LanJ, QianD-sheng. FE analysis of coupled thermo-mechanical behaviors in radial-axial rolling of alloy steel large ring [J]. Computational Materials Science, 2010, 50(1): 65-76

[9] ZhangJ-l, CuiZ-shan. Continuous FEM simulation of multi-pass plate hot rolling suitable for plate shape analysis [J]. Journal of Central South University, 2011, 18: 16-22

[10] YoshiharaS, MacD B, HasegawaT, KawaharaM, YamamotoH. Design improvement of spin forming of magnesium alloy tubes using finite element [J]. Journal of Materials Processing Technology, 2004, 153: 816-820

[11] YangH, HuangL, ZhanMei. Coupled thermo-mechanical FE simulation of the hot splitting spinning process of magnesium alloy AZ31 [J]. Computational Materials Science, 2010, 47(3): 857-866

[12] HanX-h, HuaLin. Prediction of contact pressure, slip distance and wear in cold rotary forging using finite element methods [J]. Tribology International, 2011, 44(12): 1742-1753

[13] DengX-b, HuaL, HanX-h, SongY-li. Numerical and experimental investigation of cold rotary forging of a 20CrMnTi alloy spur bevel gear [J]. Materials & Design, 2011, 32(3): 1376-1389

[14] HuZ-h, XuX-h, ShaD-yuanSkew rolling and cross-wedge rolling—principles, processes and machines [M], 1985, Beijing, Metallurgy Industry Press: 18-26

[15] QianD-s, PanYan. 3D coupled macro-microscopic finite element modelling and simulation for combined blank-forging and rolling process of alloy steel large ring [J]. Computational Materials Science, 2013, 70: 24-36

[16] PaterZ, KazaneckiJ. Complex numerical analysis of the tube forming process using diescher mill [J]. Archives of Metallurgy and Materials, 2013, 58(3): 717-724

[17] LeeH W, LeeG A, YoonD J, ChoiS, NaK H, HwangM Y. Optimization of design parameters using a response surface method in a cold cross-wedge rolling [J]. Journal of Materials Processing Technology, 2008, 201(1/2/3): 112-117

[18] HuaL, QianD-s, PanL-bo. Analysis of plastic penetration in process of groove ball-section ring rolling [J]. Journal of Mechanical Science and Technology, 2008, 22(7): 1374-1382

[19] LemaitreJ, LippmannH. A course on damage mechanics [M]. Berlin: Springer Verlag, 199682-110

[20] ZuoZ-jiangResearch On deformation laws and forming process simulation for cold ring rolling [D], 2006, Wuhan, Wuhan University of Technology