钛合金加工机床

1钛合金及其在工业中的应用钛具有强度高、重量轻和优异的耐腐蚀性,解决了很多的工程难题。钛比钢的强度高30%以上,但重量轻近40%。钛比铝重一倍,但强度高60%。钛合金是以钛为基体加入铝、锰、铁、钼和其他金属的合金,以增加钛的强度和耐高温性能,分为α-钛合金、β-钛合金、αβ-钛合金和较新的钛铝合金,其中αβ-钛合金(Ti6Al4V)应用最为广泛。钛合金的高耐蚀性也是一种宝贵的特点,当暴露于大气中时,钛能形成抗拒许多腐蚀性物料的氧化膜。     

钛合金加工的现状与展望

钛合金及其在工业中的应用 钛具有强度高、重量轻和优异的耐腐蚀性,解决了很多的工程难题。如钛比钢的强度高30％以上,但重量轻近50％;钛比铝重一倍,但强度高60％。钛合金是铝、锰、铁、钼和其他金属的合金,以增加钛的强度和耐高温性能,分为α．钛合金、13一钛合金、α β一钛合金和较新的钛铝合金,     

钛及钛合金的表面渗氧强化技术

钛及钛合金具有比强度高、耐蚀性好、良好的高温性及生物相容性等优点,是新兴的结构和功能材料,但由于其表面耐疲劳和耐磨损性能差等缺点使其应用受到限制。表面渗氧强化技术是提高钛合金表面性能的一种有效手段,本文综合评述了表面渗氧技术在钛及钛合金中的应用现状及研究进展。     

钛及钛合金焊接特性与工艺要点分析

由于钛及钛合金具有密度小、强度高、耐腐蚀等优点,所以在我国的航天航空及石油化工等领域中得到了广泛的应用。虽然钛制设备的经济投入较高,但是从全寿命周期考虑仍具有较高的性价比。为了保证钛及钛合金设备的制造质量,应该对钛及钛合金的焊接特性与工艺要点有详细的掌控,确保钛制设备的制造质量。     

钛波纹管的研制

介绍了钛波纹管制造过程中焊接和成型两道重要工序的实施过程 ,并就钛波纹管的刚度和疲劳寿命进行了初步的分析和研究 ,为钛波纹管的应用提供指导     

钛波纹管的研制

本文介绍了钛波纹管制造过程中焊接和成型两道重要工序的实施过程,并就钛波纹管的刚度和疲劳寿命进行了初步的分析和研究,为钛波纹管的应用提供指导.     

钛及钛合金的钨极手工氩弧焊

一、前言钛及钛合金具有优良的耐腐蚀性、小的比重和高的比强度(强度极限与比重之比)及一定的耐热性和加工性。因此在飞机、火箭、导弹、宇宙飞船、化工机械、炼油设备、海水淡化装置、仪器仪表和医疗器械等方面获得了越来越广泛的应用。基于钛及钛合金特定的物理、化学和热处理性能,其钨极氩弧焊工艺及接头的焊后处理等也有一定的要求。为掌握钛及钛合金的焊接工艺,提高焊接接头的质量,本文仅就钛及钛合金钨极手工氩弧焊时,必须注意的若干问题作简要介绍。     

钛及钛合金焊接工艺分析

随着科学技术的飞速发展和人们生活水平的不断提高,当前人们逐渐对钛合金焊接技术的应用重视起来。众所周知,钛和钛合金焊接工艺是我们在进行焊接工作中的重点焊接环节,因为钛的比强度相对较高,且钛的耐海水性以及耐低温性也比较高,与此同时,钛也具有无磁透声等和防抗击震动等优点。本文针对当前钛及钛合金焊接形状,对钛及钛合金具体焊接工艺进行详细分析和阐述,希望为我国焊接行业的发展贡献出一份力量。     

钛合金阀门的应用及其选材

对常用钛及钛合金进行了综述,重点介绍了国内外钛合金阀门应用现状及部件选材,分析了钛阀应用中应注意的部分问题,并指出我国今后钛阀门的主要应用领域和发展前景。     

钛及钛合金的切削加工

从发现钛到现在,随着科学技术飞跃的进步和发展,钛及钛合金因其性能优越,已在航空、航天、船舶、石油、化工等工业领域中得到日益广泛的应用。我所在520工程石油数据测井系统（PLT—B、MTS－E、PIB－C、PBFS—A）和液压升降通讯天线等重点研制项目中广泛应用了钛及钛合金结构材料。钛及钛合金的切削加工,从切削的刀具耐用度、以加工表面的质量及切屑形成和排除的难易程度等方面来衡量,钛及钛合金材料属难加工的材料。解决和总结钛及钛合金材料的特殊切削加工规律和经验,具有十分重要的意义。一、切削加工性差的主要原因导热、…     

超塑成形的钛合金波形膨胀节质量检测和分析

对等离子弧焊和激光焊筒坯超塑成形的两组DN250钛合金波形膨胀节进行了检测,检测结果表明,超塑成形的钛合金波形膨胀节波峰壁厚减薄率超过20%,柔度和补偿性能优良,明显优于不锈钢波形膨胀节;稳定性试验、耐压试验和气密性试验均符合设计要求;激光焊波形膨胀节在行程为15 mm的情况下,平均疲劳次数为1700次,其疲劳寿命比等离子弧焊波形膨胀节的疲劳寿命高20%以上。     

超塑成形的钛合金波纹管壁厚分布规律研究

以DN250双波Ti-6A l-4V钛合金波纹管为例研究了采用超塑胀形/轴向加载复合超塑成形工艺成形的钛合金波纹管的壁厚分布规律。用ARVIP3D刚粘塑性壳单元有限元软件模拟了波纹管在胀形、合模和充满3个阶段的壁厚减薄情况,分析了筒坯长度和胀形阶段的变形量对超塑成形后波纹管厚度分布情况影响。通过实验研究了波纹管的实际壁厚分布曲线。结果表明,与其它成形方法相比,超塑成形的波纹管波峰壁厚减薄率较大,壁厚分布可用JIS公式粗略估算。     

钛合金零件喷丸工艺及质量控制

目前,钛合金材料被广泛应用于国内航空工业中,但由于钛合金材料具有疲劳强度低、分散性大、硬度低及耐磨性能差等缺点,限制了其进一步应用。喷丸强化能够显著改善钛合金材料的抗疲劳性能,提高其微动疲劳抗力,从而可大幅提升钛合金零件的耐久性和可靠性。本文结合飞机起落架钛合金零件的喷丸强化实践,从材料和设备、制造过程以及维护质量3个方面进行控制,进一步保证了喷丸质量,提高了钛合金零件的使用寿命。     

Study on cutting temperature during milling of titanium alloy based on FEM and experiment

A finite element model of helix double-edge cutting was developed to study cutting temperature during milling of titanium alloy Ti6Al4V. To improve the accuracy of finite element simulation, a new method to construct material constitutive model was presented, and material constitutive model with big strain, high strain rate, and high-temperature characters for aeronautical titanium alloy in cutting process was established. Using this finite element model, milling process of titanium alloy was simulated. Cutting temperature change curves and values were obtained. An analysis indicates that the highest cutting temperature lies in tool-chip interface and is more close to cutting edge; moreover, the temperature is higher in rake face than flank face of the tool. The embedded semi-artificial thermocouple cutting temperature experiment was improved by substituting constantan band for constantan wire. By comparing the results obtained from finite element simulation and cutting temperature experiment results, a good agreement is found, showing finite element simulation analysis of cutting temperature for titanium alloy is correct.     

Effects of variable blank holder forces and a controllable drawbead on the springback of shallow-drawn TA2M titanium alloy boxes

Springback, which occurs during stamping of shallow-drawn titanium alloy sheets, can negatively influence the stamping accuracy and reliability of follow-up assembly and welding of parts and restrict the application of titanium alloy sheets when high precision is a requirement. Therefore, accurate prediction and control of springback in titanium alloy sheets is an industrial problem that requires urgent attention. In this paper, a TA2M titanium alloy box formed via shallow drawing is used as the research object and springback control during stamping is attempted by varying the magnitude and mode of the blank holder force (VBHF) and height of a controllable drawbead. The influences of drawbead height, VBHF magnitude, and loading mode on the resulting sheet springback are determined by means of finite element simulation and experimentation to determine the best combination yielding the minimum springback. The results of this research provide a reliable reference for future efforts to form tough materials.     

Prospects for the application of nanostructured titanium alloys in mechanical engineering

The results of the application of nanostructured titanium alloys, in particular the VT6 alloy, for the manufacture of hollow structures by superplastic forming and by a method combining it with pressure welding, are presented. Possibilities of the application of nanostructured titanium alloys are shown by the example of the formation of dome-shaped shells, models of a hollow blade of a jet engine fan, and weld-fabricated semi products.     

钛合金拉伸高速铣削试验研究

通过对钛合金TC4在拉伸状态下的铣削试验,重点研究了高速铣削对钛合金TC4(Ti6A14V)表面残余应力和表面粗糙度的影响,得到了在不同切削参数下钛合金TC4表面残余应力和表面粗糙度的实验数据.实验结果表明,拉伸装夹基本不影响表面粗糙度,但可以大大提高加工表面残余压应力并增大残余压应力层的厚度,为开展钛合金拉伸高速铣削加工提供了依据.     

The influence of laser assistance on the machinability of the titanium alloy Ti555-3

The Ti533-3 alloy is a new titanium alloy which is starting to see increased use in the aeronautical domain to improve the durability of components and to optimize the weight/resistance ratio. This alloy is characterized by greater resistance compared to the more commonly used titanium alloys such as Ti6Al4V. However, a disadvantage of the Ti533-3 alloy is that it is very difficult to machine. In this work, the use of laser-assisted machining has been tested to improve chip formation by a thermal softening phenomenon and to improve the machining productivity of the alloy. A parametric investigation of laser assistance on the machinability of the Ti555-3 titanium alloy shows that: (1) the cutting forces can be greatly decreased if the surface temperature is high; (2) the thermal gradient induced by laser heating modifies the surface integrity in terms of strain hardening and residual stresses in the workpiece; and (3) the chip formation mechanisms are also changed, by increasing the sawteeth frequency when using laser assistance.     

Fretting wear behavior of nitrogen ion implanted titanium alloys in bovine serum lubrication

Nitrogen ion implantation was performed on biomedical titanium alloys by using of the PBII technology to improve the surface mechanical properties for the application of artificial joints. The titanium nitride phase was characterized with X-ray photoelectron spectroscopy (XPS). The nanohardness of the titanium alloys and implanted samples were measured by using of in-situ nano-mechanical testing system (TriboIndenter). Then, the fretting wear of nitrogen ion implanted titanium alloys was done on the universal multifunctional tester (UMT) with ball-on-flat fretting style in bovine serum lubrication. The fretting wear mechanism was investigated with scanning electron microscopy (SEM) and 3D surface profiler. The XPS analysis results indicate that nitrogen diffuses into the titanium alloy and forms a hard TiN layer on the Ti6Al4V alloys. The nanohardness increases from 6.40 to 7.7 GPa at the normal load of 2 mN, which reveals that nitrogen ion implantation is an effective way to enhance the surface hardness of Ti6Al4V. The coefficients of friction for Ti6Al4V alloy in bovine serum are obviously lower than that in dry friction, but the coefficients of friction for nitrogen ion implanted Ti6Al4V alloy in bovine serum are higher than that in dry friction. Fatigue wear controls the fretting failure mechanism of nitrogen ion implanted Ti6Al4V alloy fretting in bovine serum. The testing results in this paper prove that nitrogen ion implantation can effectively increase the fretting wear resistance for Ti6Al4V alloy in dry friction, and has a considerable improvement for Ti6Al4V alloy in bovine serum lubrication.