Towards Friction Stir Remanufacturing of High-Strength Aluminum Components

Volumetric defects in high-strength aluminum alloy components were repaired via friction stir remanufacturing (FSR). Various consumable pins made of AA7075-T6 were designed. Top diameters of the consumable pins affected material flow, which ensured that the materials at the repairing interface were forged to metallurgical bonding. Conical angles determined load transfer besides material flow, which affected the fracture of the pins before the dwelling stage. Sound repaired components were achieved when the conical angle of the consumable pin was 1° larger than that of the volumetric defect. The ultimate tensile strength and elongation of the repaired components reached 445.9 MPa and 9.6%, respectively. The design criteria of the consumable pin in the FSR was established, which provided valuable references to repair volumetric defects in high-strength aluminum components.     

大型平板硫化机电控系统设计

介绍了我公司自主研发的大型平板硫化机的概况,着重介绍了其电控系统的设计情况及其主要特点。     

基于ANSYS Workbench的大型挤压造粒机双螺杆芯轴有限元分析

大型挤压造粒机芯轴是非常重要的零件,为避免其失效破坏,本文分别采用有限元分析与传统理论力学计算对其强度进行验算。     

一种新型轮胎硫化机中心机构工作性能的模拟研究

中心机构是轮胎定型硫化机的重要部件,目前现有轮胎定型硫化机的进水口和出水口平行设置在中心机构的底部,当过热水充满整个胶囊后开始在胶囊里进行循环时,位于中心机构底部位置的过热水不能充分地与顶端的液体进行热量置换就流出胶囊,造成轮胎胎侧上下两端温差较大,整个胶囊内的热交换效率低下,轮胎硫化不均匀。因此,本文提出一种新型轮盼定型硫化机中心机构,并且详细阐述其作用机理,利用FLUENT模拟软件与现有的轮胎定型硫化机中心机构的工作性能进行比较,以更好地说明其能够明显改善轮胎的硫化效果。     

Experimental and quantum chemical studies of the effect of poly ethylene glycol as corrosion inhibitors of aluminum surface

The corrosion inhibition of poly ethylene glycol (PEG) toward the aluminum surface in 1.0 M HCl has been studied by weight loss and polarization techniques. The results showed that the PEG acts as a good inhibitor and the inhibition efficiency is due to the anodic and cathodic inhibition (mixed type). The thermodynamic functions were calculated to find a good correlation with the inhibition efficiency. Quantum chemical parameters were calculated using ab initio and DFT methods to find a good correlation with the inhibition efficiency. A good correlation was found between the theoretical calculations and experimental observations.     

膨润土对Pb~(2+)的吸附及铝的影响研究

研究膨润土对水溶液中铅的吸附特性以及铝对铅吸附的影响。通过各组吸附实验,建立膨润土对水溶液中铅离子的吸附最佳条件,天然膨润土对铅的吸附平衡时间约为60 min,其吸附符合一级动力学方程;铅吸附最适p H=9;天然膨润土对水溶液中铅离子的吸附规律符合Freundlich等温方程和Langmuir等温方程,呈显著相关性;加入少量铝离子时,吸附除铅能力增强,但继续增加铝浓度,去除能力降低,该现象主要通过铝盐水解所致的p H变化起调节作用,电中和作用不明显。     

季戊四醇改性三氯化铝催化C_(12)～C_(14)烯烃齐聚反应的研究

使用季戊四醇改性三氯化铝催化剂,对C12-C14的内烯烃的齐聚反应进行研究,对反应过程中的三氯化铝用量,改性剂用量,反应时间,反应温度对齐聚物的收率的影响。确定其最佳的工艺条件,三氯化铝用量2%,改性剂季戊四醇用量0.25%,水浴反应加热温℃度,反应时间4 h,在此条件下,以C12-C14内烯烃为反应主原料合成了聚烯烃合成油,对其物理性质和化学性质进行研究。研究结果显示,采用此质量分数的C12-C14的内烯烃,可以合成100℃黏度为7.15 mm2·s-1。粘度指数为133和凝点-39℃的聚烯烃合成油,其收率为78%,具有黏度低,凝点低和黏度指数高的特点,是高质量的润滑油基础油。。     

冲压模具设计课程建设的探索

基于企业对模具设计与制造人才的需求,结合高职院校模具专业学生的特点及就业分析,模拟实际工作过程,改革课程建设,完成了《冲压模具设计》课程“教学做”一体化教学设计方案。实践表明,教学效果得到显著改善,提高了学生的基本职业素养和岗位基本技能。