A finite element (FE) model for the numerical control (NC) bending of Ti-3Al-2.5V titanium alloy
seamless tube is established, considering the variation in the contractile strain ratio (CSR) and elastic modulus
(E). The wall thinning characteristics of Ti-3Al-2.5V tube under different geometric and process conditions were
investigated. The results showed that the CSR-E variation can change the wall thickness, but has no remarkable
effect on the change characteristics. The reasonable parameter ranges are as follows: a bending-radius range not
less than 1.5 times the outer diameter, a bend angle up to 180?, and a mandrel extension of 0—3mm. The friction
coefficient between the pressure die and the tube should be in the range of 0.20—0.35, and between the bending
die and the tube should be in the range of 0.05—0.15. As long as the performance meets the requirements, the
relative push-assistant speed should be as small as possible.
HUANG Tao (皇涛), WANG Kun (王锟), ZHAN Mei (詹梅), GUO Junqing (郭俊卿), CHEN Xuewen (陈学文), CHEN Fuxiao (陈拂晓), SONG Kexing (宋克兴)
. Wall Thinning Characteristics of Ti-3Al-2.5V Tube in Numerical Control Bending Process[J]. Journal of Shanghai Jiaotong University(Science), 2019
, 24(5)
: 647
-653
.
DOI: 10.1007/s12204-019-2079-1
[1] ZHAN M, WANG Y, YANG H, et al. An analyticmodel for tube bending springback considering differentparameter variations of Ti-alloy tubes [J]. Journalof Materials Processing Technology, 2016, 236: 123-137.
[2] SAE Aerospace. Contractile strain ratio testing of titaniumhydraulic tubing: AS4076 [S]. USA: SAE International,2013.
[3] General Administration of Quality Supervision, Inspectionand Quarantine. Metallic materials—Sheetand strip—Determination of plastic strain ratio:GB/T 5027 [S]. Beijing: Standards Press of China,2016 (in Chinese).
[4] ANDAR M O, KUWABARA T, STEGLICH D. Materialmodeling of AZ31 Mg sheet considering variationof r-values and asymmetry of the yield locus [J]. MaterialsScience and Engineering A, 2012, 549: 82-92.
[5] MACKENZIE P M, WALKER C A, MCKELVIE J.A method for evaluating the mechanical performanceof thin-walled titanium tubes [J]. Thin-Walled Structures,2007, 45(4): 400-406.
[6] KUMAR A, SAPP M, VINCELLI J, et al. A study onlaser cleaning and pulsed gas tungsten arc welding ofTi-3Al-2.5V alloy tubes [J]. Journal of Materials ProcessingTechnology, 2010, 210(1): 64-71.
[7] TANG N C. Plastic-deformation analysis in tube bending[J]. International Journal of Pressure Vessels andPiping, 2000, 77(12): 751-759.
[8] PAN K, STELSON K A. On the plastic deformation ofa tube during bending [J]. Transactions of the ASME,1995, 117(4): 494-500.
[9] BARDELCIK A, WORSWICK M J. The effect of elementformulation on the prediction of boost effects innumerical tube bending [C]//6th International Conferenceand Workshop on Numerical Simulation of3D Sheet Metal Forming Process. Detroit, MI, USA:American Institute of Physics, 2005: 774-780.
[10] OLIVEIRA D A, WORSWICK M J, GRANTAB R.Effect of lubricant in mandrel-rotary draw tube bendingof steel and aluminum [J]. Canadian MetallurgicalQuarterly, 2005, 44(1): 71-78.
[11] DYMENT J N, WORSWICK M J, NORMANI F, etal. Effect of endfeed on strains and thickness duringbending and on the subsequent hydroformability ofsteel tubes [C]//International Body Engineering Conference& Exposition. USA: SAE International, 2003:717-722.
[12] WANG G X, YANG H, LI H, et al. Experimental studyof the influence of processing parameters on formingquality of thin-walled NC bending tube [J]. MachanicalScience and Technology, 2005, 24(8): 995-998 (inChinese).
[13] SHEN S J, YANG H, ZHAN M, et al. Experimentalstudy on large diameter and thin-walled aluminumtube NC bending process [J]. Journal of Plasticity Engineering,2007, 14(6): 78-82 (in Chinese).
[14] ZHAN M, HUANG T, ZHANG P P, et al. Variation ofYoung’s modulus of high-strength TA18 tubes and itseffects on forming quality of tubes by numerical controlbending [J]. Materials and Design, 2014, 53: 809-815.
[15] ZHAN M, HUANG T, YANG H. Variation of contractilestrain ratio of Ti-3Al-2.5V tubes and its effects intubes numerical control bending process[J]. Journal ofMaterials Processing Technology, 2015, 217: 165-183.
