共查询到19条相似文献,搜索用时 171 毫秒
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车用扭杆端头镦粗时所用的模具,会对其变形进行约束和限制,恰当的模具设计不仅可以提高生产效率,而且可以改善扭杆端头的结构及力学性能,提高扭杆的使用寿命,从而减少企业的生产成本。建立了扭杆端头及镦粗模具的有限元模型,采用DEFORM-3D软件对有限元模型进行网格划分,并仿真整个镦粗过程,分析了不同模具结构形状和不同始锻温度下镦粗后的模具磨损、模具寿命、扭杆端头应力、扭杆端头金属材料流速及流线分布。结果表明:始锻温度为1250℃时,采用合理的模具结构进行镦粗,可以减小模具磨损、延长模具寿命,而且成形得到的扭杆端头的综合性能较好。 相似文献
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针对游艇转向机构中某转向臂在实际生产中出现的充不满的缺陷,设计了以模具预热温度、始锻温度、镦粗台孔深、镦粗下压量、压扁厚度为设计变量,以锻件充形率、终锻力为目标函数的混合水平正交表,通过对正交试验结果进行灰色关联处理,并进行极差分析,得知镦粗下压量、镦粗台孔深对目标函数影响显著。为了得到更优的工艺参数,在正交试验的基础上结合中心复合试验进行再优化,建立了以镦粗下压量、镦粗台孔深为自变量,以锻件充形率和终锻力为因变量的二阶响应面模型,从而得到了该产品的最优工艺参数。经过生产验证,优化后的工艺参数能在较低的成形载荷下锻造出合格的产品,并且消除了充不满的缺陷。 相似文献
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采用有限元模拟软件FORGE-3D,对径向锻造轴类件工艺参数进行数值模拟研究。分析不同径向压下量、夹头转速和轴向进给速度对锻透性和生产效率的影响。结果表明:锻造过程中,径向压下量越小、夹头转速越高和轴向进给速度越慢,则锻件外表面就越光滑,表面粗糙度越小,尺寸精度越高。径向锻打45钢Φ110 mm棒料的最佳条件为:径向压下量5 mm,转速30 r·min~(-1),轴向进给速度20 mm·s~(-1)。通过模拟仿真来验证和优化径向锻造工艺,大大降低了径向锻造工艺开发的周期,降低了多次锻造实验的成本。 相似文献
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针对三通管接头在模锻成形中易出现破裂、材料折叠、冲头载荷大等问题,研究了冲头速度、坯料初始温度、摩擦系数对锻件模锻质量的影响.通过Deform软件,研究了水平冲头和垂直冲头等速进给、水平冲头和垂直冲头差速进给、水平冲头进给而垂直冲头不运动3种工艺条件下锻件的成形规律,并基于上述最佳工艺,研究了坯料初始温度对模锻过程中温... 相似文献
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《中国有色金属学会会刊》2022,32(10):3276-3290
A kind of surface instability, basin-like depression defect companied by mixed grain structure at the bottom of large-scale valve during electric upsetting process, would significantly influence the microstructures and mechanical properties of components. In order to analyze the forming process of the basin-like depression defect, a finite element model for the electric upsetting process of Ni80A superalloy was developed using multi-field and multi-scale coupling analysis method. Subsequently, a series of parameters loading path schemes for force and current were designed by varying the initial value, peak value and value level, and their effects on basin-like depression and mixed grain structure were simulated and uncovered. It is concluded that the changes of heating speed and pressurization speed result in the different flow velocities between the inner and outer layers of billet, thus exerting the basin-like depression. Simulation results also indicate that these defects can be optimized through the parameter coordination between force and current. Finally, the validity and reliability of the finite element model were verified by physical experiments in electric upsetting process. 相似文献
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Initial surface micro-scratches due to cropping, rolling or handling change that cause crack or lap defects during forging and reduce the quality of forged products. Elimination of surface micro-defects in forging is pressing problem in forging industry. A new method of finite element analysis featuring effective meshing and an adaptive remeshing system is applied to clarify the mechanism of the formation or the disappearance of surface micro-defects in forging. V-shaped and rectangular scratches on the surface of billet are simulated under the axisymmetric assumption and the basic deformation of scratch during upsetting and the influence of friction on the deformation of micro-defects are discussed. Shallow V-shaped scratch on the top surface of billet tends to disappear and deep scratch becomes lap defect during upsetting. Defects are more likely to disappear under low friction. It is possible to predict that an initial surface micro-scratch on the billet remain or not as a defect after forging. 相似文献
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Usama Umer 《Journal of Materials Engineering and Performance》2012,21(9):1857-1861
H-13 is the toughest tool steel used in machined die casting and forging dies. Due to its extreme hardness and poor thermal conductivity high speed cutting results in high temperature and stresses. This gives rise to surface damage of the workpiece and accelerated tool wear. This study evaluates the performance of different tools including ceramics and PCBN using practical finite element simulations and high speed orthogonal cutting tests. The machinability of H-13 was evaluated by tool wear, surface roughness, and cutting force measurements. From the 2D finite element model for orthogonal cutting, stresses and temperature distributions were predicted and compared for the different tool materials. 相似文献
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针对单工序锻造在终锻之前一般都需要以镦粗进行预制坯的实际情况,以刚粘塑性有限元为工具,以获得形状和变形均匀性都较好的终锻件为优化设计目标,以镦粗的压下量为优化设计变量,采用黄金分割法对其预制坯工艺进行了多目标优化设计的研究。并对一轴对称锻件的镦粗压下量进行了优化设计,优化取得了明显的效果。 相似文献
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本文用常温云纹法与数值模拟法研究了筒体锻件整体镦粗与局部镦粗工艺的变形规律,得到了整体镦粗工艺的坯料尺寸图。对于在端部内壁处取样的核电筒体锻件,应采用局部镦粗工艺,以锻透取样部位。为避免端部折叠,局部镦粗时单砧压下量应小于10%。 相似文献