汽车后制动器底板冲压工艺改进

介绍了厚板较大型多工序冲压件由传统的单工序冲压工艺生产形为多工位一次性冲压成形的冲压工艺。提高了生产效率,降低了制造技术。     

平顶链链板自动冲压成形系统设计北大核心CSCD

为提高平顶链链板精度和生产效率,根据平顶链链板冲压成形工艺,以及生产效率要求,设计了一套多工位自动冲压成形系统,其中包括冲压模具结构设计以及送料系统设计。冲压模具结构设计包括预弯模具、折弯模具以及卷圆模具的结构设计,并利用ABAQUS有限元分析软件进行冲压模拟仿真,改进模具尺寸,提高链板成形精度。送料系统设计包括储料装置、自动送料装置结构设计及相关设备选型。为了实现自动化冲压生产,自动送料装置采用的是三自由度横杆式结构。最后,完成了样机制作和实验,试生产出的平顶链链板合格率达到97.83%,生产效率达每分钟9件,结果表明,所设计的平顶链链板自动冲压成形系统达到了链板的生产精度和生产效率要求。     

热成形高强钢新材料的研究与应用

2016年全球生产的9000多万辆轿车中,有超过2800万辆在中国生产。随着汽车轻量化的进程．热冲压成形技术和装备获得持续的增长。全球有300多条热冲压生产线在世界各地的运作,中国已有50多条热冲压生产线在实际运行,还有几十条正在安装调试中：目前世界各地生产了约3．5亿件热冲压零件,仍然保持较高的增长率。在热成形技术的发展中．热成形材料和工艺的创新对生产效率和质量的提高以及成本的降低具有重要的影响。     

冲压工艺柔性化生产——联合安装、半自动化和多工位的综合应用

单序冲压设备通过采用联合安装，半自动化和多工位的综合应用能最大限度的优化冲压生产工艺。降低生产成本和提高生产效率。     

冲压模具设计中对机械运动的控制和运用

冲压模具作为一种重要的制造技术,在现代工业生产中发挥着越来越大的作用。目前,许多企业仍然沿用传统的手工制作方法来制造冲压模具。这种方法虽然可以满足一些简单的需求,但无法保证模具的质量和稳定性。为了解决这个问题,主要分析了冲压模具设计中对机械运动的控制及应用。可以更好地提高模具的生产效率,降低成本并提升产品质量。     

立体式废料滑道在冲压自动化线中的应用

当前,我国汽车企业冲压车间正全面走向自动化生产．全新自动化线安装、老手工线改造如火如荼。冲压作为汽车制造四大工艺的龙头,冲压件的质量和生产效率直接影响到整车的质量和生产效率,冲压生产的自动化既可有效提高生产效率、改善劳动环境．又可对冲压件质量提升起到积极作用。因此．汽车制造冲压车间总是致力于冲压生产线生产效率、生产产品质量的提升,以及安全作业环境的打造、制造成本的降低。奇瑞;中压车间对废料滑道的改善目的也基于此。     

冲压模具与自动冲压线的动态仿真研究

建立完整的虚拟冲压生产线包括压力机、端拾器和模具,真实地模拟冲压生产的全过程。使在生产制造模具前期就能直观简单的验证、优化冲压件的工艺性及模具设计结构的合理性,改进端拾器和模具的结构设计,消除碰撞干涉问题,提高生产效率。     

受力平衡及对称冲压

根据冲压力平衡的概念，介绍了对称冲压方法，并用典型实例说明了这种方法对保证产品质量、提高生产效率和延长模具寿命的重要意义。     

基于同步工程原理的多零件组合冲压工艺方案及模具设计

本文介绍了一种基于同步工程原理的多零件组合冲压工艺方案及其模具设计;通过对不同零件的排列组合及组合体成形性分析,合理排布各序冲压工艺内容,有效实现了多零件的组合生产,重点讲述了单个零件的优化步骤和方法,以及多零件组合后的工艺方案的设计要点及其模具结构。实际生产证明,该冲压工艺方案可有效降低冲压工序数,减少模具工装开发成本及后期生产成本,提高了生产效率。     

浅析集烟罩人工冲压生产线自动化改造

现状分析冲压工艺是厨电行业最重要的工艺之一,随着厨电行业的飞速发展,行业内的竞争、人工成本的不断增加,企业降本的压力逐年加剧,带动了冲压自动化技术的快速发展。多数传统的人工手动作业方式,已逐渐更新为自动化的作业方式。为提升人工冲压线生产效率、优化成本,对人工冲压线进行自动化升级改造,在对传统的人工手动冲压作业生产线改造时,需本着提升制造技术水平。     

Characterisation of the Flow Properties of the Quenchenable Ultra High Strength Steel 22MnB5

Nowadays in the automobile industry more and more high strength steels find their application. For their processing innovative forming technologies, like the non-isothermal hot stamping process, are required. With regard to a reliable numerical process design the knowledge of the thermal and thermo-mechanical properties is essential. Within this paper an experimental setup will be introduced, which enables the determination of the material's flow behaviour according to the hot stamping time-temperature-characteristics. Further results of investigations on the thermo-mechanical flow properties of the quenchenable, ultra high strength steel 22MnB5 in dependency of the temperature, the strain and the cooling rate etc. will be represented.     

冲压叠边在钣制皮带轮生产中的应用

分析了钣制皮带轮的特点及传统冲压工艺,介绍了用机、气、液控制的叠边模具的结构和多楔皮带轮缩口叠边成形工艺及模具结构。采用叠边工艺生产的皮带轮抗弯强度和抗扭强度至少要比切削加工的零件提高2倍以上。     

Application of a Uniform Pressure Actuator for Electromagnetic Processing of Sheet Metal

High-velocity electromagnetic sheet-metal forming and processing has many potential advantages over more conventional techniques, including: higher-forming limits, resistance to wrinkling and springback, one-sided tooling, and physical contact to only one side of the work piece. Traditional electromagnetic actuators are flat spirals that produce a nonuniform pressure distribution, limiting the types of parts that can be formed. A new type of electromagnetic actuator, the uniform pressure (UP) actuator, has been developed. The UP actuator can uniformly and efficiently accelerate conductive sheet metal to velocities on the order of 200 m/s or greater over distances of a few millimeters. When the material is arrested by impact with a tool, high-forming pressures can be imparted to it. The utility of the UP actuator is illustrated here by demonstrating its ability to form sheet metal components with intricate shape, to shock harden, and also to pick up nearly arbitrarily small details from a die surface. Thus, electromagnetic processing with the use of the UP actuator offers the unprecedented ability to simultaneously form and engineer the surface morphology and microstructure of sheet metal samples. This article was presented at Materials Science & Technology 2006, Innovations in Metal Forming symposium held in Cincinnati, OH, October 15-19, 2006.     

Microstructural and mechanical investigation of aluminum tailor-welded blanks

The push to manufacture lighter-weight vehicles has forced the auto industry to look to alternative materials than steel for vehicle body structures. Aluminum is one such material that can greatly decrease the weight of vehicle body structures and is also consistent with existing manufacturing processes. As in steel structures, cost and weight can be saved in aluminum structures with the use of tailored blanks. These blanks consist of two or more sheets of dissimilar thicknesses and/or properties joined together through some type of welding process. This enables the design engineer to “tailor” the blank to meet the exact needs of a specific part. Cost savings can be gained by the elimination of reinforcement parts and the stamping dies used to manufacture them. Weight savings can be attained based on the fact that one thicker piece is more efficient than a welded structure and therefore can allow for down-gauging of parts. Although tailor-welded blanks (twbs) offer both potential weight and cost benefits, the continuous weldline and thickness differential in twbs can often result in difficulty in stamping. This problem is more severe in aluminum because of its limited formability as compared with typical drawing-quality steels. Additionally, welding of steel twbs tends to increase the strength of the weld material, which helps prevent failure in the weld during forming. Aluminum twbs do not experience this increase in strength and therefore may have a greater tendency to fail in the weld. In this study, several aspects of twbs manufactured from 6111-T4, 5754-O, and 5182-O aluminum alloys were analyzed and compared with those of a more conventional steel twb. The effect of gauge mismatch on the formability of these blanks is discussed as well as the overall potential of these blanks for automotive applications.     

航空发动机零件冲压过程模拟及回弹分析

应用ANSYS/LS_DYNA软件对某航空发动机钣金件的三维冲压成形过程进行模拟 ,并对成形后的钣金件回弹进行了分析 ,给出了分析结果并对结果进行了分析总结。分析结果可指导钣金件冲压模具设计 ,可根据分析结果对钣金件的冲压模具进行科学有效的修正 ,缩短模具制造周期 ,提高模具使用寿命 ,得到高质量的钣金件 ,使航空发动机产品的可靠性得到更大的保障     

Investigation on induction heating for hot stamping of boron alloyed steels

Within hot stamping of quenchenable steels the blank is heated up to austenitization temperature, transferred to the tool, formed rapidly and quenched in the cooled tool. Essential for the complete process is the heating of the blank which is currently carried out with roller hearth furnaces. As a consequence of rising energy costs new and more time and energy effective heating systems are needed. The paper presents investigations on induction heating as an alternative heating technology. Results concerning the process windows as well as material characteristics and grain structure will be presented and discussed.     

Determination of tribological conditions within hot stamping

Innovative hot sheet metal forming technologies are gaining an increasing significance in the scope of application of more and more innovative high and ultra high strength steels in the automotive industry. With respect to a numerical process design beside the mechanical and the thermal material characteristics the friction coefficient represents an important input parameter for finite element (FE) simulation. Within the scope of this paper an evaluation method for the determination of the friction coefficient μ for the direct hot stamping process of boron-manganese steels will be presented. Therefore cup deep drawing tests at elevated temperatures following the time-temperature-characteristic of the hot stamping process are carried out. For the calculation of the friction coefficient the approach according to Siebel for the modeling of the maximum drawing force is used.     

Frictional behavior of the sliding interface between an A2 steel die and zinc-coated steel sheet

The forming of coated sheet steel products is performed for a wide range of processing conditions. This article examines the effects of die history on the frictional nature of the sheet-die interface. It has been found that as successive tests are performed on a die from the as-lapped condition to the “run-in” condition, the die surface morphology changes significantly and the coefficient of friction, μ, decreases. Changes in surface roughness as well as scratch formation on the die are believed to affect the nature of the die-workpiece, lubricant interaction. The findings in this study suggest that the extensive polishing procedures used in the manufacture of new stamping dies should be carefully reevaluated.     

高强钢材料性能对汽车零件扭曲回弹的影响

高强度钢板材料冲压性能的波动对冲压成形后零件精度的影响较大,主要表现在成形性能不稳定和回弹波动较大。文章侧重材料性能波动对冲压件扭曲回弹的影响,结合某汽车车身高强钢零件的冲压结果,借助有限元仿真工具,比较实验与仿真结果,在结果基本一致的基础上,研究高强度钢板的屈服强度、应变硬化指数、摩擦系数及板料厚度波动对该零件扭曲回弹影响规律。应用科学实验设计方法,考察了主要因素的影响规律,得到高强钢材料性能参数影响板料扭曲回弹的相关结论,从降低回弹波动及扭曲对制造精度的影响出发,提出了材料性能参数优化选取原则。     

联接板冲孔落料级进模设计

分析了联接板的3种工艺方案,单工序、复合工序及连续工序,采用冲孔落料连续工艺,能提高工件的尺寸精度及生产率,降低生产成本。介绍了联接板毛坯的排样图、冲压力及压力中心的工艺计算,设计了联接板冲孔-落料级进模的模具结构。