开关簧片多工位级进模设计

分析了开关簧片零件的成形工艺性能,介绍了开关簧片级进模的总体结构和排样方案.实践证明:该模具结构合理,性能可靠.     

簧片多工位级进模设计

分析了簧片零件的工艺特点 ,介绍了零件的排样设计方案、模具结构及工作过程。     

簧片级进模设计

分析了簧片零件的工艺特点，介绍了零件的排样设计方案、模具结构。     

微电机连接簧片多工位级进模设计

分析了微电机连接簧片成形工艺,介绍了连接簧片排样方案与多工位级进模结构,级进模包括冲裁、弯曲、卷圆等多种工序。生产实践表明:级进模结构合理,能保证产品质量,生产率高,可供类似零件的成形提供参考。     

65Mn弹簧钢簧片断裂分析

以断裂的65Mn弹簧钢簧片作为研究对象,对簧片断口的宏观形貌、微观组织、化学成分及显微硬度等进行分析,对簧片加工工艺和操作进行检查分析并试验。结果表明:由于折弯工序未采取防护措施,簧片折弯处造成损伤,且大量H原子向折弯处聚集,最终导致簧片氢致延迟脆性断裂。完善簧片的折弯工艺,减少应力集中,在技术要求范围内适当降低硬度,通过试验验证完善工艺措施的有效性。     

继电器簧片成形工艺及模具设计

分析了继电器簧片原工艺方案存在的问题 ,提出了解决该问题的新方案 ,并设计了新模具结构     

簧片多工位级进模设计

分析了簧片制件结构特点和成形工艺,介绍了该制件的级进模排样和总装结构设计,以及模具主要工作零件的加工工艺方法。     

簧片冲压成形分析与模具结构创新设计

通过对簧片冲压成形工艺的分析,制订了模具整体结构及排样设计方案.针对簧片结构中的小孔特征,其冲孔凸模在冲压加工中磨损较快,为实现冲孔凸模的快速换修和装配,设计了一种冲压凸模装置——卡槽式快换凸模.采用该结构的凸模既可保证成形产品的表面质量,又显著降低了生产成本,提高了冲压生产效率,尤其适用于凸模形状复杂、局部薄弱、需要经常维修、更换的连续冲压模具,具有很好的应用前景和实际意义.     

接触簧片冲压工艺及模具结构设计

以接触簧片的冲压工艺设计为研究对象,运用弯曲件的工序安排方法和级进模的排样设计方法,主要研究了接触簧片的弯曲和切废工艺设计方案。结果表明:根据冲件结构特点,采用分段弯曲和分段切除余料的方法,交替安排弯曲工位、切废工位和空工位,可以优化模具结构;用有去屑功能的抬起块抬起条料,用限位块控制模具的冲压高度,用带弹压装置的导板和弯曲凸模压料,有效控制了偏移和回弹,保证了接触簧片的精度。     

螺母板簧片级进模设计

介绍了螺母板簧片级进模结构特点和设计要点.     

Wear and cutting performance of diamond composite material-a comparison with tungsten carbide

A series of wear and rock cutting tests were undertaken to assess the wear and cutting performance of a thermally stable diamond composite (TSDC). The wear tests were conducted on a newly designed wear testing rig in which a rotating aluminium oxide grinding wheel is turned (also known as machined) by the testing tool element.The rock cutting tests were performed on a linear rock-cutting planer. The thrust and cutting forces acting on the tool were measured during these tests. A tungsten carbide element was also studied for comparative purposes. The wear coefficients of both materials were used to evaluate wear performance while cutting performance was assessed by tool wear and the rates of increase in forces with cutting distance.     

铝制药瓶挤压工艺分析与模具设计

分析铝制药瓶成形工艺性和模具设计的难点,论述拉深和冷挤压2种工艺的优缺点和旋转压印机2种不同方案的优缺点,介绍冷挤压模和压印模的结构及旋转压印机的设计要点。实际生产证明:工艺方案合理,模具和旋转压印机结构安全可靠,满足零件的技术要求和产量要求。     

采用响应面方法和中心复合旋转设计对低品位锰矿浸出过程建模与优化(英文)

采用实验设计软件对从低品位锰矿中浸出提取锰的过程进行优化。在中心复合响应面实验设计中,考察了4个主要影响浸出过程的参数,即硫酸浓度、草酸浓度、浸出时间和温度。将锰和铁的浸出率作为考察指标。采用统计分析和方差分析确定了最优条件,即最高的锰和铁浸出率、最短的浸出时间和最低的温度。结果表明,硫酸浓度是影响浸出过程的最显著的参数,在最优条件下:硫酸浓度7%,草酸浓度42.5g/L,浸出时间60min,反应温度65℃,锰和铁的浸出率可分别达到93.44%和15.72%。     

锁挡多工位级进模设计

分析了锁挡零件的结构工艺性和冲压工艺,介绍了零件的排样方案、模具总体结构、工作过程、主要零部件的设计,并阐述了模具结构特点。模具结构合理、紧凑,工作平稳,生产效率高,生产的零件质量达到要求。     

Preparation and characterization of uniform circinate aggregates of sheet ZnO nanoparticles

Uniform circinate aggregates of sheet ZnO nanoparticles with a specific surface area of 24 m2·g-1 were prepared by the direct precipitation method.The circinate aggregates were hexagonal ZnO,with the wall thickness ranging from 0.5 to 1 μm and the diameter ranging from 5 to 10 μm.The backs of the circinate aggregates were regularly arranged by numerous sheet ZnO nanoparticles with a thickness of 30-80 nm and a diameter of 300-400 nm.The precursors were aggregates of sheet Zn5(CO3)2(OH)6 nanoparticles,which were decomposed into ZnO by calcining in air in the range of 200-285℃,and the ZnO retained the similar special structure.The C2H5OH content had a significant effect on the formation of sheet ZnO.The centripetal force,the Van der Waals force,and the hydrogen bond were deduced as the driving forces of the formation of circinate.     

机械合金化制备Cu-Cr合金时效强化特性的研究

采用机械合金化工艺制成Cu—Cr合金粉末,然后热压成形制备铜铬合金。采用XRD、TEM分析机械合金化过程中Cu-Cr合金粉末的显微组织和晶粒大小,测试了热压成形后Cu—Cr合金的力学和电学性能,探讨了材料的强化机制和热压温度对组织性能的影响。结果表明,Cu—Cr合金粉末可通过机械合金化获得过饱和固溶体,热压成形后,组织细小均匀,具有优良的综合性能。该合金经840℃热压并保温2h后,其强度达最大值,显微硬度为205．3HV,抗拉强度633．5MPa,电导率为80．4％IACS。合金中过饱和的Cr原子的作用是使合金沉淀强化。     

SCH13钢表面微弧火花沉积Stellite合金

采用高能微弧火花沉积技术在SCH13钢表面制备Stellite合金涂层.利用扫描电子显微镜、能谱仪、X射线衍射仪对沉积层的显微组织形貌、成分及结构进行分析,并对微弧火花单脉冲沉积斑的形成与生长机制进行重点研究.结果表明,高能微弧火花作用下Stellite合金单脉冲沉积斑呈飞溅状,大量单脉冲斑的不断叠加最终形成具有一定厚度的沉积涂层.微弧火花沉积层依附于基体的界面以柱晶组织呈外延生长,并与基体形成良好的冶金结合,涂层稀释率较低,主要由γ-Co固溶体和铬的碳化物组成.随着工作电压的增加,沉积层显微组织略有粗化,其平均硬度较Stellite合金电极材料有显著提高.     

铝合金和低碳钢的电阻点焊数据特征

研究了电阻点焊过程中不同条件下的电极位移和电极压力的数据特征.试验设备为170 W逆变直流点焊机.采用多通道高速数据采集系统采集电极位移和压力数据,用MATLAB进行数据分析,比较了5182铝合金和低碳钢的点焊行为特征.结果表明,当熔核长大到一定程度后,铝合金熔核膨胀速率不会像低碳钢那样达到零值,且电极力会出现一个峰值,该峰值预示着熔核已经达到了足够的尺寸.     

The influence of surface condition on the metal dusting behavior of cast and wrought chromia forming alloys

The current work investigated the impact of surface condition on the metal dusting behavior of chromia forming alloys. Five commercial alloys were included in the study, wrought 800H, 353MA, and cast G4859, G4852 Micro, and ET45 Micro, these alloys have a chromium and nickel content in the range of 20–35 wt% and 32–45 wt%, respectively. The wrought alloys were tested in a pickled state and the cast alloys with a machined surface, all the alloys were tested using a laboratory ground surface condition for comparison. The exposures were performed using a gas with a composition of 44 vol% CO, 52 vol% H₂, 2 vol% CO₂, and 2 vol% H₂O at a temperature of 600 °C and a pressure of 5.5 bar. The samples were periodically characterized by measuring the mass loss, pit density, pit size, and pit depth. The results show that the pickled surfaces were sensitive toward metal dusting attack while the machined and the ground surfaces had better resistance. This shows that the surface pre‐treatment plays a crucial role.     

前叉下管铸件的铸造工艺设计

介绍了前叉下管铸件的结构及技术要求,详细阐述了其铸造工艺设计:采取垂直分型,膨润土湿型砂造型;采用底注式浇注系统,圆锥形直浇道的截面面积为972 mm2,横浇道与直浇道、内浇道相连接,横浇道为截面积1 200 mm2的标准梯形浇道,内浇道的截面面积为420mm2,选用六角形浇口杯,浇注速度为8.12kg/s,浇注时间为5s,浇注温度为1580℃;采用12个尺寸为30mm×60mm×75mm的冷铁,选用腰形暗冒口,尺寸为a=50 mm,b=100 mm,h=100 mm;选择扁形出气孔。模拟结果显示,整个铸件未发现有缩孔、缩松等铸造缺陷,而且工艺出品率也达到了76.53%。