无间隙冲压复合模设计

在冷冲压模具设计中,结构及凸凹模间隙设计、材质选用、热处理硬度选取的准确合理,为确保模具的制造精度、制作周期、使用寿命提供了必要的前提。在调整垫片新品研发及批量投产阶段,要求同一零件有3种不同料厚。经过反复研究、工艺分析、多种工艺方案比较,采用无间隙落料冲孔通用复合模(一模三用)结构设计,一次性冲压成型。生产实践证明,该模具冲压出的零件完全符合设计图要求,并可为生产类似冲压件的机械同行提供借鉴。     

基于CAE技术的汽车座椅配件冲压分析与设计优化

根据某型号轿车座椅配件的成形精度和生产批量等要求,分析冲压件的结构特点和冲压工艺,提出采用多工位级进模的冲压方案。然后应用冲压分析软件FormingSuite对钣金件进行自动展开计算,最后基于冲压CAE技术得出最危险的区域并根据分析结果对冲压工艺过程进行调整和优化。根据CAE结果优化后制造的级进模一次试模完成。实践证明,CAE技术可以避免模具设计的缺陷和减少修模的次数。     

冲压模具凸凹模间隙控制与调整方法研究

模具凸模和凹模之间的间隙将直接影响制件的质量和模具的使用寿命,合理控制凸、凹模间隙并使其均匀是装配的关键。笔者深入探讨了冲压模具装配前需注意的问题,分析研究了凸、凹模间隙的控制与调整方法,并提出了模具使用后间隙变化的调整修配措施,对模具装配生产实践具有指导意义。     

几种简单的冲压技巧

在冲裁模设计实践中,有时可利用简单实用的冲压技法,将一些棘手的问题大大简化,起到事半功倍的效果,提高效率和生产质量。现简单介绍其中的几种方法。 1.卷边模的设计图1所示零件,板厚为1mm。过去该零件的卷边工序采用旋压成形,结果尺寸公差及圆度公差均达不到要求,而且效率低,不适合批量生产。经过分析,可以把大直径小卷边看作是一平板材的卷边,将卷边工序用冲压成形来完成,并设计了如     

盆形端盖零件的拉深模设计

介绍了一种机器零件——盒形端盖的冲压工艺分析、工艺方案确定以及合理冲压模具的设计。并具体介绍了盒形工艺方案确定的方法，合理选取凸、凹模间隙及最佳模具的设计方法和过程。此次模具设计的突出特点是尝试使用复杂的复合模具，解决常规冲压工艺模具套数多、工艺路线长、生产成本高、效率低等缺点，并为以后此类零件冲压工艺的编制及模具设计提供了可靠的依据。     

基于LS-DYNA的电子元件冲压成形仿真研究

针对电子元件结构尺寸较小,采用传统方法设计其成形模具效率低且很难保证质量,基于LS-DYNA接触碰撞算法,建立了工件、凸凹模的冲压成形有限元模型,定义了成形条件。在分析过程中通过创建接触界面来实现凸凹模与工件之间力和运动的传递。分析得到了工件应力应变分布图和成形性能图。采用接触碰撞算法可根据节点的时间-位移图来判断工件成形质量,并通过调整分析输入参数来获得最佳成形条件:凸凹模间隙和冲压速度。将仿真分析结果应用到模具设计和冲压工艺参数的拟订定中,实际生产表明仿真分析数据合理可靠。     

化工版模具类精品图书推荐

冲模制造典型实例作者:郑展等编著本书根据作者近60年冲模设计与制造的经验进行了归纳整理,并收集、筛选、整理了国内外先进模具技术的先进经验,系统地介绍了中小型冲模设计与制造方法及典型实例,针对冲裁模、弯曲模、拉深模、成形模及冷挤压模,从工艺分析入手,对冲模设计方法及步骤、零件加工工艺、冲模装配工艺等方面进行了简明的阐述。书号:9787122196118定价:49.0元开本:16出版日期:2014年4月冲压模具设计实用教程作者:匡和碧、孙卫和编著系统地介绍了冲裁模设计、弯曲模设计、拉深模设计、其他成形模设计的基本理论与设计方法。每个模块     

凸模快速更换的冲模设计

通过联接片复合冲压模的设计,介绍了一种快速更换小型凸模的冲模设计方法,并指出了在此类模具设计制造中应注意的问题.     

采用可移动凹模的板材液压成形技术

提出一种改进的板材液压成形新工艺,即采用可移动凹模,实现拉深与胀形的复合液压成形。在整个变形过程中,板材初始变形部分始终与可移动凹模接触,从而抑制已变形区进一步变形,使变形更加均匀,实现变形的顺序控制,板材成形极限得到提高。从试验和数值模拟两方面对可移动凹模板材液压成形技术进行了研究,分析各种工艺参数,如摩擦因数等对板材成形性的影响,并且分析了可移动凹模对板材成形极限的影响。     

操纵杆冲压工艺分析与模具设计

根据操纵杆的结构特点与生产要求,分析了操纵杆的冲压工艺,制定了适合操纵杆生产要求的冲压工艺方案,阐述了冲孔落料级进模、冲凸模和弯曲模的结构设计与工作过程。经生产验证,模具设计满足成形要求,对类似零件的模具设计具有一定的参考价值。     

A new sheet metal forming system based on incremental punching, part 2: machine building and experiment results

The paper is the second of the two papers on a new sheet metal forming system of incremental punching. In the first paper, the mechanics model is introduced, and the computer simulations are carried out. This paper consists of two parts: the design and building of an incremental punching machine and experiment results. The machine is a three-axis computer numerical controlled (CNC) machine with a high-speed hydraulic punching head. Given a part, the punch path can be generated using commercial CAM systems with some modifications. Then, the machine takes over forming the part punch by punch. The formability of this system is also investigated giving the maximum forming angle. Following the first paper, two examples are studied in details. The experiment results indicate that the new system is effective for sheet metal rapid prototyping. Finally, some future research topics are discussed.     

An experimental analysis of effects of various material tool’s wear on burr during generator sheets blanking

Blanking is one of the most frequently used processes in sheet metal forming. Unlike other forming processes, such as stamping, blanking not only deforms the metal plastically to give the appropriate size and shape, but also ruptures the sheet metal in the desired zones. Among the others, blanking enables manufacturing of electric motor components, such as rotor or stator parts. The parts of the low power commutator motor of rotor and stator are made of generator sheets, which are really difficult to do from the machining point of view. The shock loads and high reaction of the sheet metal of separation surface to the punch surface are presented during the blanking process. In this paper, an investigation has been made to study the effects of punch–die clearance, tool materials, and tool coatings on the wear of blanking tools. In the paper, the feasibility analysis for various materials used for production of the tools for punching the generator sheets is presented.     

Study of the punch–die clearance influence on the sheared edge quality of thick sheets

Sheet metal punching is an important industrial process for forming mechanical parts. Aimed at generating holes on thick sheets, punching process has been considered as a promising solution for the heavy industrial sector. The correct punching parameters choice has a direct influence on the hole quality. Since there exists rarely an analytical expression describing the relationships between these process parameters, the forming variable choice follows a series of costly try-and-error procedures on the workshop floor. The numerical simulation is a powerful tool that helps the forming engineers at the try-and-error procedures. This work shows the possibility of using FE-simulations to reduce the number of experiments that has to be conducted propitiating an increased understanding concerning some punching process parameters influence. The aim is the study of the clearance influence on the punched holes quality, 8 mm LNE38 sheet metal. Clearances of 0.2% up to 15% between the punch and die were analyzed. The influence of the punch–die clearance on the crack propagation was also analyzed, and the results were in agreement with the literature, i.e., good results for gaps within the traditional ideal range and occurrence of burr for clearance of 15%.     

板料成型性能指数对钣金零件成型工艺性的影响

这里详细论述了板料成型性能指数n、r值的物理意义及其对各种钣金零件成型工艺性的影响，结合典型成型工艺，利用钣金冷压成型原理，对n、r值的具体影响进行了分析研究，得出了一些针对具体成型工艺的一般规律性的结论。将这里的一些概念和分析研究的结果同具体的生产实践相结合，则会对促进生产和提高成型件的质量有一定的指导意义。     

变压器硅钢片级进冲裁模具研究与设计

根据给定的具体零件图的尺寸和公差要求，并结合北京森泰模具有限公司生产实际中的使用条件。设计了生产变压器硅钢片的级进冲裁模具。包括：冲压工艺设计、排样设计、级进模结构设计及主要工作部件设计等。     

叠层金属薄板材料的冲裁特性研究

在冲裁分离过程中,单层与叠层金属板材存在很大的差异。通过对比2者的不同特点,选取并分析微元体的应力应变状态,发现在叠层冲裁过程中,变形区内中间层的材料处在3向压应力状态,表现出很强的可塑性。分析冲裁中各因素对应力状态的影响发现,合理地减小凸模与凹模的间隙可以提高变形区的静水压,抑制裂纹的产生,使冲裁过程控制在塑剪变形阶段。以叠层母线冲孔为例来验证理论分析,试验结果与分析一致,叠层冲裁比同厚度单层冲裁所要求的模具间隙更小,其值取在普通冲裁间隙经验公式的基础上乘以0．4左右的修正系数为宜。     

基于6σ的稳健优化设计在薄板冲压成形中的应用

薄板冲压成形过程中,其设计变量和噪声因素都具有一定的波动,都存在不确定性。传统的优化设计由于忽略不确定因素的影响,当设计变量产生波动时,往往会导致设计最优目标超出约束界限或者目标函数对设计变量的波动极为敏感,从而使设计失效。采用自主开发的STLMesher软件建立了模具的参数化模型,在此基础上将试验设计、能代表实际冲压过程精度较高的近似模型和蒙特卡罗模拟技术相结合,构造了基于产品质量工程的6σ稳健优化设计方法。该方法在设计初始阶段就考虑了各种不确定因素的影响,因此在获得近似最优解的同时能够提高设计变量的可靠性和目标函数的稳健性,大幅提高产品的质量。在优化过程中调用的是近似模型,能大大减少调用有限元模型的次数,提高优化效率。算例表明,该方法具有较高的精度和较强的工程实用性。     

Simulation and Experiment on Workability for Cold Pressure Forming of Sheet Metal Part with Step Cross-section

In modem manufacturing, a new type of sheet metal part with step cross-section in both inner hole and outer edge is proposed. The traditional stamping separating processes can only produce sheet metal part with vertical cross-section. According to the latest developing theory and potential of cold pressure forming: combination of pressure and cold forging, a new flow control forming of sheet metal(FCF) is excogitated based on blanking process of general stamping and combined with cold forging processes such as extrusion and coining, etc, which is aiming at the above-mentioned new type of sheet metal part. With utilization of this new process, the new type of sheet metal parts can be manufactured. In order to shorten the testing period, the numerical simulation was carried out by using DEFORM-3D software, and both deformation and mechanics rules were analyzed. Based on the simulation, both punching part and blanked parts of this new type were successfully developed. Then a new conception of optimal distance between the step walls of inner hole and outside edge was proposed and the design principle for its numerical value was inferred. Furthermore, a mold set for combination of stamping & cold forging was designed and manufactured, by which the technologic experiments were taken for validation with Aluminum plate of thickness 2.35 mm for power battery cover board, which verified the principle of the distance between the step walls. The research of cold pressure forming of thin sheet metal with step cross-section is significant, not only to the development of modem mechanical manufacture, but also to metal plastic forming science.     

基于单片机的数控冲压进给系统的设计

金属板材加工是金属加工的一个重要门类,为了改变冲压生产率低,效益差的状况,本文以开发经济、实用的高速数控冲压进给系统为目标,从机械与控制两个方面对冲压进给系统展开设计.设计中提供了数控冲压进给系统的各组件选型方法及其最终结构设计参数,为普通冲床的数控改造提供了理论依据,同时对于数控冲压系统的完善起到积极的促进作用.     

CIMT2003锻压机械展品评述

第八届中国国际机床展览会锻压机械类参展商约80家,国内参展商(包括台湾地区和外企的代理商)约54家,国外参展商约26家。共展出锻压机械类展品110余台套,其中国内展品约80多台套,国外展品约20多台套。与上届展览会比较,国外参展商数量略有增加,而展品数量有所减少。