共查询到17条相似文献,搜索用时 62 毫秒
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钛合金筒形件真空热胀形壁厚效应的数值模拟 总被引:1,自引:0,他引:1
建立了钛合金筒形件真空热胀形的二维非线性热力耦合有限元模型。使用有限元软件MSC-Marc对钛合金简形件真空热胀形过程进行数值模拟。计算了钛合金筒形件真空热胀形过程的温度场和变形场,并进行了相应的实验验证。模拟结果与实验结果吻合较好。用建立的模型对真空热胀形过程中钛合金筒形件壁厚效应进行数值模拟,讨论了一定工艺条件下钛合金筒形件壁厚与弯曲角度、胀形量和残余应力之间的关系,为实际生产中制定和优化钛合金筒形件真空热胀形工艺参数提供理论与实践依据。 相似文献
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利用热胀形对钛合金薄壁筒形件精确成形是一种新的成形方法,胀形芯轴设计是热胀形精确成形关键技术之一.本文阐述了热胀形成形原理、胀形芯轴材料的选取、尺寸的确定及结构设计,给出了热胀形成形工艺流程. 相似文献
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建立了转子屏蔽套真空热胀形过程的二维轴对称有限元模型。借助非线性有限元软件MSC.Marc的二次开发功能,将Hastelloy C-276合金的蠕变本构模型与真空热胀形过程的有限元模型相结合,模拟了转子屏蔽套的真空热胀形过程。计算了真空热胀形过程中转子屏蔽套和模具内部的瞬时温度场和径向位移场,预测了转子屏蔽套的胀形量。研究了模具厚度、保温时间和保温温度等工艺参数对转子屏蔽套真空热胀形胀形量的影响。开展了真空热胀形工艺实验,模拟结果与实验结果吻合较好。 相似文献
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本文采用大变形刚塑性有限元法成功地模拟了球形件胀形过程,分析了材料参数对胀形件厚度分布的影响,模拟结果与实验结果进行了比较。 相似文献
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Temperature is one of the key parameters for BT20 titanium alloy cylindrical workpiece manufactured by vacuum hot bulge forming. A two-dimensional nonlinear thermo-mechanical coupled FE model was established. Numerical simulation of vacuum hot bulge forming process of titanium alloy cylindrical workpiece was carried out using FE analysis software MSC Marc. The effects of temperature on vacuum hot bulge forming of BT20 titanium alloy cylindrical workpiece were analyzed by numerical simulation. The simulated results show that the Y-direction displacement and the equivalent plastic strain of the workpiece increase with increasing bulge temperature. The residual stress decreases with increasing bulge temperature. The optimal temperature range of BT20 titanium alloy during vacuum hot bulge forming is 750-850 ℃. The corresponding experiments were carried out. The simulated results agreed well with the experimental results. 相似文献
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Microstructure evolution model based on deformation mechanism of titanium alloy in hot forming 总被引:4,自引:3,他引:4
The microstructure evolution in hot forming will affect the mechanical properties of the formed product. However, the microstructure is sensitive to the process variables in deformation process of metals and alloys. A microstructure evolution model of a titanium alloy in hot forming, which included dislocation density rate and primary a phase grain size, was presented according to the deformation mechanism and driving forces, in which the effect of the dislocation density rate on the grain growth was studied firstly. Applying the model to the high temperature deformation process of a TC6 alloy with deformation temperature of 1 133 - 1 223 K, strain rate of 0.01 -50 s^-1 and height reduction of 30%, 40% and 50%, the material constants in the present model were calculated by the genetic algorithm(GA) based objective optimization techniques. The calculated results of a TC6 alloy are in good agreement with the experimental ones. 相似文献
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磁脉冲板材成形属于高速率变形,应变速率可达到100~1000 s-1,因此导致变形过程的大量参数信息无法准确获取,给磁脉冲变形过程的研究与分析带来了较大的困难。采用数值模拟和工艺试验相结合的方法,对5A02铝合金磁脉冲胀形过程进行了研究,分析了不同放电电压条件下板材的磁场分布以及运动过程。结果表明,胀形首先在电磁力最大区域先发生变形,随后带动其他区域变形,板材的变形速度在0.2 m·s-1时达到最大,其中间区域测得速度最大可达116 m·s-1,胀形在0.6ms达到最大值,而后由于回弹其胀形高度有小幅下降。 相似文献
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The hot rheological forming method was proposed to form the second titanium alloy vane disk. The hot rheological forming process of the TC 11 titanium vane disk under a certain temperature and different strain rates was investigated by using the bulk forming software of DEFORM 3D. A series of results including temperature field, equivalent strain distribution, load-stroke curve and rheology procedure were obtained by this finite element method. The rheological forming characteristics were well realized and the forming parameters were determined. The results and analysis show that with decreasing strain rate, the metal flow more equably and the filling of the vane shape is also better. Moreover, the mechanical properties and microstructures of the products produced by this new technique are improved evidently compared with that produced by traditional method. 相似文献
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6061-T6铝合金高温本构模型及温成形数值模拟 总被引:1,自引:0,他引:1
基于6061-T6铝合金在高温变形过程中的动态回复、动态再结晶及变形硬化特性,分析其在不同温度阶段的黏塑性特征,在高温阶段进一步引入软化因子修正传统Field-Backofen模型,使之适用于铝合金温成形的热力本构描述。通过NAKAJIMA凸模胀形数值仿真及试验对比发现:高低温(25~400℃)相结合的软化型热拉伸本构方程可以准确地描述板料破裂前的集中软化特征,且可以有效满足6061铝合金高温成形性能的仿真需求。 相似文献