气液过滤网成形模具设计

分析了不锈钢气液过滤网冲压工艺,介绍了一种可以使零件弯曲、整形并通过本身结构实现自动送料的模具。阐述了模具的结构特点、主要零件以及设计过程中应注意的问题,可为类似零件的模具设计提供参考。     

汽车操纵杆自动冲压模

介绍了一副自动冲压模,该模具是通过PLC编程控制系统,控制一套集电器、液压、气压和机械传动技术为一体的自动冲压模.叙述了该冲压模的模具结构和自动冲压的过程,是冲压工艺实现自动操作的一个典型实例,也是管类零件侧冲孔实现自动操作的一个典型实例.     

支架自动攻丝级进模设计

介绍了带自动攻丝机构的级进模,通过分析支架零件的工艺性,设计了排样图与模具结构,并对模具结构特点进行了说明,模具上、下模板具有高精度和长寿命,重复装配精度高。实践证明:模具结构可靠,加工的零件质量合格,生产效率高,对此类零件的级进模设计具有一定的参考作用。     

张力盘落料-拉伸-冲孔-整形复合模具设计

通过对零件的冲压工艺分析，设计了落料、拉伸、冲孔、整形复合模具，阐述了模具结构及工作过程．并对模具主要零件的设计制造作了介绍。     

挂钩冲压工艺及模具设计

针对零件结构及使用要求,对其冲压工艺进行了分析,通过利用孔变形补偿法,确定了一种经济性加工工艺方案及零件的毛坯尺寸,设计了实用的模具结构,满足了零件的使用要求,降低了生产成本.     

铁芯片通用级进模设计

重点介绍了3种铁芯片在1副模具上实现冲压的设计过程,对零件的工艺进行分析,介绍了确定生产该零件采用的级进模模具结构和零件冲压工步图.     

膜盒开关转盘工艺分析与级进模设计

对膜盒开关转盘的冲压工艺进行了分析,给出了排样方案和总体模具结构,对模具结构特点、主要零件和关键工位的结构设计应注意的问题进行了阐述,并给出了解决措施,模具装配、维修方便,生产可靠,满足了企业的要求。     

G52管帽多工位级进模设计

根据G52管帽零件冲压工艺特点,对模具总体结构和中孔翻孔、翻斜孔、拉深壳体等关键工序进行了优化组合,设计了多工位级进模。生产实践证明:模具结构合理,制件质量稳定,可满足企业生产要求。     

光头屏蔽罩级进模设计

通过对光头屏蔽罩(属典型罩形零件)进行冲压工艺分析，提出了该零件采用多工位级进模的冲压方案，并介绍了排样、模具结构及主要零件的设计过程。     

筒套的冲压工艺及模具设计

针对筒套零件结构，分析、比较了两种加工工艺方案，选择了最经济、合理的加工工艺方案，同时设计了相应的冲压模具，一次性加工出了合格的零件。     

Forming Limit Curves in Single Point Incremental Forming

New experimental data is presented on Forming Limits in Single Point Incremental Forming (SPIF), which is a sheet metal forming process which does not require dies. A Box-Behnken Design of Experiment is used to develop the experimental plan and analyze data. In former work, the most critical factors affecting Single Point Incremental Forming were found to be material type, material thickness, formed shape, tool size, and incremental step size. In this experimental work, new results are presented as graphical response surfaces which show the forming limit for all the critical factors listed previously. In addition, forming limits are presented in terms of Forming Limit Diagrams.     

电磁成形技术在薄板成形中应用的研究进展

电磁成形技术是一种高能、高效成形技术,目前已在工业生产中获得广泛应用,是近年来一种新兴的板材塑性加工方法.本文从理论、试验和有限元仿真3个方面介绍了国内外电磁成形技术运用于薄板成形领域的最新成果,主要阐述了管件缩径成形和胀形成形、平板成形以及薄板校形方面的研究进展,讨论了在应用研究中存在的问题和进一步发展方向.     

On Practical Forming Limits in Superplastic Forming of Aluminum Sheet

In this paper, the superplastic forming (SPF) potential of two fine-grained 5083 aluminum alloys were studied under various stress states with the use of both high temperature tensile testing and pneumatic bulge testing. Experiments with the pneumatic bulge test were performed at temperatures ranging from 475 to 525 °C under three different strain paths ranging from equi-biaxial to approaching plane strain. The effects of temperature on total elongation, m-value, final thickness distribution, dome height, and cavitation were investigated for the case of uniaxial and equi-biaxial stretching. Increased temperature in bulge forming was found to improve the thickness distribution in the formed parts, but did not have a significant effect on dome height. The shape of the forming limit diagram (FLD) was found to be significantly different than that of FLDs commonly used in room temperature stamping. Results indicate that determination of forming limits in SPF cannot be represented with a simple FLD and additional metrics such as external thinning and internal cavitation need to be considered to determine a material’s SPF potential. This article was presented at Materials Science & Technology 2006, Innovations in Metal Forming symposium held in Cincinnati, OH, October 15-19, 2006.     

Forming strategies and Process Modelling for CNC Incremental Sheet Forming

Incremental Sheet Forming (ISF) is a process capable of producing complex sheet components by the CNC movement of a simple tool in combination with simplified dies. Earlier work revealed two major process limits, namely the limitation on the maximum achievable wall angle, and the occurrence of geometric deviations. The work detailed in this paper focuses on forming strategies to overcome these process limits, including the processing of tailor rolled blanks. Additionally, finite element modelling of the process is presented and discussed with respect to the prediction of the forming limits of ISF.     

Flexible Sheet Forming Technology by Double-sided Simultaneous Shot Peen Forming

The exceptionally flexible forming technology shot peen forming is used primarily on large, three-dimensionally curved sheet metal in the aircraft and aerospace industries. Depending on the kinetic shot energy, both convex and concave curvatures will be generated. The most recent development, double-sided simultaneous shot peen forming, brings about a higher productivity of the entire process. FEM simulations of single and multiple impacts are presented in order to evaluate the characteristics of concave curvatures generated by both single and double-sided peen forming.     

工业纯铝板料渐进成形极限图研究

板料渐进成形极限图和传统成形极限图有显著不同,到目前为止尚未有统一的测试方法.提出了一种测试板料渐进成形极限图的方法,成形工具分别沿往复圆弧和交替往复圆弧轨迹运动,对0.9mm工业纯铝板进行渐进成形.板料破裂后,获得了主应变和次应变,建立了该种板料渐进成形极限图.通过板料渐进成形分别成形了一些零件,测量了零件的主应变和次应变并绘制了它的渐进成形极限图.结果表明,所获得的工业纯铝渐进成形极限图能较为准确地预测渐进成形中板料的破裂,测试方法适用于渐进成形极限图的建立.     

成形参数对堆焊沉积成形质量的影响

设计了三因子二次通用旋转回归试验,求出了成形参数与成形质量间的回归方程,并通过显著性检验验证了方程的合理性。建立了相邻焊缝间的数学模型,在保持成形工艺不变的条件下,研究了成形间距对顶点高度差、搭接率的影响。实验结果表明:当成形间距为4.2 mm、成形电流为110 A、成形速度为6 mm/s、送丝速度为50 mm/s时,较有利于堆积成形的顺利进展,且成形件的各项力学性能良好。     

金属板料的机械喷丸成形与激光喷丸成形技术

机械喷丸成形和激光喷丸成形是两种喷丸成形技术，用于成形外形变化平缓的蒙皮类镀金零件。论述了这两种喷丸成形技术的原理、特点和发展趋势，并对它们的工艺参数进行了分析和比较。     

Paddle Forming: A Novel Class of Sheet Metal Forming Processes

A novel class of ‘paddle forming’ processes for forming pronounced features within sheet metal components is presented. The processes are incremental in nature and are characterised by having contact between the tool and the workpiece along a short line segment. The processes lead to high through-thickness shear strains, which have been shown to increase the possible deformation before ductile instability occurs. Paddle forming tools, which are cheap and simple to manufacture, can be applied to the faces or edges of sheets, tubes and disks. Four example processes are demonstrated, each showing high deformation and pronounced through-thickness shear strain.     

电磁成形技术在粉末成形中的应用

介绍了电磁成形技术、粉末挤压成形方法以及电磁成形技术在粉末成形中的应用.用电磁成形技术压制粉末材料是获得高密度、高性能粉末冶金制品的一种有效方法,是低成本制造高密度陶瓷零件的新途径.