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磁研磨法对钛合金弯管内表面的抛光研究 被引量:25
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作者 邓超 韩冰 陈燕 《航空制造技术》 2015年第3期61-63,共3页
航空发动机中所使用的钛合金弯管在加工时其内表面会产生微裂纹、褶皱等缺陷,用传统的研磨工艺难以实现对弯管内表面的抛光处理,而磁力研磨加工工艺却可以很好地解决这一难题。利用磁力线可以穿透钛合金弯管的特性,磁性磨料可以在外加... 航空发动机中所使用的钛合金弯管在加工时其内表面会产生微裂纹、褶皱等缺陷,用传统的研磨工艺难以实现对弯管内表面的抛光处理,而磁力研磨加工工艺却可以很好地解决这一难题。利用磁力线可以穿透钛合金弯管的特性,磁性磨料可以在外加磁场的作用下压附在弯管内表面,并随磁场高速旋转与弯管内表面产生相对运动,从而达到研磨钛合金弯管内表面的目的。本文对磁研磨法加工钛合金弯管内表面的研磨原理及磁性研磨颗粒的受力情况进行了的分析,并通过详细的试验研究得出:钛合金弯管内表面经过研磨后,原有的微裂纹、褶皱等缺陷得到明显改善,表面粗糙度值由R_a0.35μm降低到R_a0.12μm,验证了磁研磨法对钛合金弯管内表面的研磨抛光起到的良好效果。 展开更多
关键词 磁力研磨 钛合金弯 表面缺陷 旋转磁场
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Wrinkling prediction in rubber forming of Ti-15-3 alloy 被引量:4
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作者 孙永娜 万敏 吴向东 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第10期3002-3010,共9页
Wrinkling is a common failure in the sheet metal forming of titanium owing to the relatively poor ability to shrink. It is important to predict wrinkling accurately in the sheet metal forming without costly trials. Th... Wrinkling is a common failure in the sheet metal forming of titanium owing to the relatively poor ability to shrink. It is important to predict wrinkling accurately in the sheet metal forming without costly trials. The ABAQUS/Explicit code was utilized to predict the wrinkling behavior in the sheet metal forming of Ti-15-3 alloy sheets. In terms of the comparison of wrinkling behavior between the simulation and experiment of the Fukui's conical cup tests at room temperature, the sensitivities of wrinkling simulation to various input parameters were evaluated comprehensively and quantitatively. Prediction of wrinkling and influence of rubber hardness on the winkling behavior in the rubber forming of convex flange were investigated quantitatively and validated by the rubber forming experiments. The excellent agreements between the simulations and the experiments conIirmed the accuracy of the prediction. 展开更多
关键词 Ti-15-3 alloy WRINKLING convex flange rubber forming quantitative analysis
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Effects of second phases on mechanical properties and martensitic transformations of ECAPed TiNi and Ti-Mo based shape memory alloys 被引量:8
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作者 宋杰 王立明 +5 位作者 张效宁 孙小刚 江鸿 范志国 谢超英 吴明雄 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第8期1839-1848,共10页
TiNi and Ti-based shape memory alloys were processed by equal channel angular pressing (ECAP) at 673-773 K along Bc route to obtain ultrafine grains for increasing the strength of parent phase and improving the func... TiNi and Ti-based shape memory alloys were processed by equal channel angular pressing (ECAP) at 673-773 K along Bc route to obtain ultrafine grains for increasing the strength of parent phase and improving the functional properties. The effects of both thermodynamically stable and metastable second phases on the mechanical properties and martensitic transformations of these alloys were investigated. It is found that thermodynamically stable Ti2Ni phase has no effect on martensitic transformation and superelasticity of Ti-rich TiNi alloy, thermodynamically stable α phase is harmful for ductility of Ti-Mo-Nb-V-Al alloy, but metastable Ti3Ni4 phase is effective for R phase transformation, martensitic transformation and superelasticity of Ni-rich TiNi alloy. The mechanisms of the second phases on the martensitic transformations and mechanical properties were discussed. 展开更多
关键词 TiNi alloy Ti-Mo based shape memory alloy equal channel angular pressing (ECAP) second phase mechanical property
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Numerically controlled bending performance of medium strength TA18 titanium alloy tubes under different die sets 被引量:13
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作者 ZHAN Mei JIANG ZhiQiang +2 位作者 YANG He XU XuDong LI GuangJun 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第4期841-852,共12页
The rapid development of aviation and aerospace technologies has led to increased interest in the application of numerically controlled(NC) technology for bending light-weight titanium alloy tubes.In order to study an... The rapid development of aviation and aerospace technologies has led to increased interest in the application of numerically controlled(NC) technology for bending light-weight titanium alloy tubes.In order to study and develop advanced NC bending technology,it is necessary to understand the bending performance of medium strength TA18(Ti-3Al-2.5V,ASTM Gr.9) titanium alloy tubes during NC bending under different die sets.This paper focuses on the bending performance of medium strength TA18 tubes under different NC bending die sets,including the variations in the stress,strain,wall thickness,cross sectional deformation,and defects.The results show that adding a wiper die to the base die set decreases the radial,hoop,and tangential compressive stress and the tangential compressive strain,and adding a mandrel to the base die set also decreases these stresses,but increases the radial and hoop tensile stress and decreases the hoop compressive strain obviously,and brings about a three-dimensional tensile stress concentration where the mandrel provides support.For the NC bending of medium strength TA18 tubes,the flattening of cross section is more sensitive index than the thinning of wall thickness.Introducing a mandrel can improve the flattening of cross section obviously but it has a little worse effect on the thinning of wall thickness,and adding a wiper die to the base die set can inhibit the occurrence of the inside bulge but worsen the flattening of the cross section remarkably.Considering the above effects of the mandrel and wiper die on bending performance,it is reasonable to apply the die set comprising a bending die,clamp die,and pressure die for tubes with a small diameter and the die set including an appropriate mandrel additionally for tubes with a larger diameter,in order to bend the medium strength TA18 tubes with high quality and at low cost. 展开更多
关键词 bending performance medium strength titanium alloy tube numerically controlled bending die set
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