共查询到19条相似文献,搜索用时 156 毫秒
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根据采集的汽车前盖的特征参数,详细设计了包边机中的压紧定位装置、举升装置和包边组件的结构。结合专用包边机,设计采用预包边上模、终包边上模和底模的结构类型,上模块采用分块设计,底模为一个整体。该设计定位准确,包边平顺严实,调试方便。 相似文献
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针对旧包边机存在的问题,提出了新型包边机的总体设计方案。采用上模块运动到位形成一个完整的型面之后再由底模托着工件向上运动的技术方案,解决了旧包边机各模块运动不一致的难题。在此基础上,采用PLC对包边机的各动作进行实时控制。新型包边机加工工件质量高,包边平顺严实,无折皱现象。 相似文献
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制造圆锥滚子的冷镦凹模为四体组合结构,由于底模、中模与模套的结合定位基准不同,使装配后其同心度难以保证而影响凹模的寿命。通过底模与中模外锥面采用相同角度、在底模基准面车去应力槽、合理设计底模工作部分尺寸等措施,使凹模使用寿命同比提高80%以上。 相似文献
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为了改进某飞机发动机减震器两种常用模具结构的不足,设计了一种压胶模,该模具采用上模、中模、下模以及活动型芯四个模具结构零件,上模与型芯、中模与下模均采用锥面配合,底模上与型芯的定位面和与中模的定位面可一次加工完成,且上模与中模之间采取齐平外骨架处水平分型.论文还详细介绍了模具尺寸设计及技术要求. 相似文献
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梁芳 《机械工人(热加工)》2011,(13):49-50,52
汽车车门、发动机罩等门盖类零件,是车身制造中的关键外观部件。门盖类零件兼备开启和闭合功能,由于对相邻件的曲面一致性、间隙均匀程度等装配要求较高,所以包边质量的好坏就显得尤为重要。现有的包边方式有4种:手工包边、机器人滚边、包边模+压力机包边、台式包边机包边。手工包边投资小,但质量难以保证,一致性差,基本不用;机器人滚边柔性好,方便变化调整,适合多 相似文献
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郑州读者范兵来信说 ,由于食品机械的发展 ,有些零件需要用不锈钢薄板包边 ,包边的方式较多 ,希望本刊介绍有关包边的经验。 本文介绍了在普通车床上用卷压成形模卷压不锈钢薄板包边圈代替模具冲压加工包边圈 ,显著降低了产品成本 ,又提高了产品质量。包边圈如图 1所示 (圆环成形后焊接 )。图 1 包边圈 一、原模具冲压成形工艺原工艺用模具落料冲孔 (材料 :δ0 .4,1Cr18Ni9Ti)在冲床上采用复合模落料冲孔 ,再用翻边模翻边。翻边后 ,零件在炉内加热烧红 ,放入所需包紧的零件 (筛网 )进行压紧 ,因材料较薄 ,无压边装置 ,板料在压… 相似文献
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针对机械式折边装置存在灵活性差、更换成本高等问题,对电气驱动的剪刀、握持装置、折入装置等折边执行部件进行了研究,对纯电子式的折边装置的工作和步进电机跟随运动进行了归纳,提出了一种基于飞思卡尔ARM Cortex-M0Plus内核单片机以及步进电机跟随算法和自抗扰控制技术相结合的控制策略,结合控制策略设计了电子式折边装置的嵌入式硬件电路以及软件程序,并利用Matlab下的Simulink进行了仿真实验。研究结果表明,电子式的折边装置在使用步进电机跟随算法和自抗扰控制技术相结合的控制方法后,有效地提高了抗扰能力,解决了时滞问题,提高了电子式折边装置的控制精度。 相似文献
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通过对锻模的工作条件及失效分析,提出了提高AMP50-XL精锻机用系列锻模寿命的研究方案及途径。研制了新型模具材料CH95,并制定了其最佳热处理工艺主合理的离子氮化。经生产上应用表明;用CH95钢制造锻模使用寿命比用H11钢制造锻模和随机进口的3Cr3Mo3Co3V钢锻模的使用寿命分别提高5倍以上和1倍以上。 相似文献
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Bor-Tsuen Lin Chian-Kun Chan Jung-Ching Wang 《The International Journal of Advanced Manufacturing Technology》2008,36(7-8):671-680
The design of drawing dies is a very complex and knowledge-intensive process. This paper describes a knowledge-based parametric design system for drawing dies which requires only a minimum set of parameters to be set before it is able to complete the design of the main components of a die, such as upper dies, lower dies, and blank holders. This minimum set of parameters includes blank sizes, die faces, punch open lines, drawing strokes, and press data. This design system implemented on top of the Pro/E CAD software consists of a drawing die knowledge base, a subcomponent inferencer, a dimension calculator, a subcomponent generator, a system coordinator, and a user interface. We use the design of drawing dies for inner wheel house as a concrete example to show that our system can greatly improve the design quality while reducing the development time and cost. 相似文献
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W.A. Gordon C.J. Van Tyne Y.H. Moon 《International Journal of Mechanical Sciences》2007,49(1):104-115
In Part 1 of this series of papers, six kinematically admissible velocity fields, as well as the power terms, were developed for use in upper bound models for arbitrarily shaped dies for axisymmetric extrusion. Part 2 compared the results obtained in upper bound models for the six velocity fields through a spherical die shape and demonstrated that the sine-based velocity field was the best. In this final part, the application of the sine-1 field to extrusion through streamlined dies is developed. By fixing the values of two additional constants in the radial flow flexibility function, the two surfaces of velocity discontinuity, which separate the deformation zone from the incoming and outgoing material, will have no shear. In effect, the analysis for streamlined dies can be modeled without the surface of velocity discontinuity power terms. The results for an arbitrarily curved streamlined die, as proposed by Yang and Han, using the sine-1 velocity field and the cylindrical velocity field from the work by Yang and Han are compared. It is found that the upper bound model using the sine-1 velocity field predicts lower values for the extrusion pressure. A method to determine a streamlined die shape is proposed. The method allows flexibility between the entrance and exit by the use of a Legendre polynomial series for representation of the die surface. The method is termed an adaptable die design. The adaptable die design method is used to determine streamlined die shapes, which will minimize the pressure required for the extrusion process. 相似文献
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对蒸发器管板模具结构和设计方法进行改进优化.经过分析和总结前人积累的经验,运用Creo软件及插件来设计制冷设备冷冲落料拉伸模具.通过增加模具结构合理性,采用复合冲压方法,增加打料装置,设计定位装置,满足多型号管板冲压,提高生产效率,减少模具种类及冲压中更换次数. 相似文献
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本文简略分析冲压生产线选择方向并介绍提高压床和冲模的利用率方法以及模具刃口制造新工艺、标准零部件在模具中的应用等情况 ,特别是模具刃口制作新工艺实际应用的经验方法 ,值得推广应用 相似文献
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在机械加工机床中,机床及机械模具的精度直接影响加工零件的精度。为确保加工零件的加工精度,机床及机械模具的精度应当与所加工零件要求的精度相适应。机械模具的加工精度受夹具、刀具、量具选择的差异性,加工过程中会使机械加工精度受到不同程度的影响。加强对影响机械模具加工精度的因素的控制,就可以有效的提高机械模具加工的进度。本文介绍了机械模具高精度加工的要求,分析了影响机械模具加工精度的主要因素。在此基础上探讨了机械模具加工精度控制策略。旨在为机械模具高精度加工制造提供一些参考。 相似文献
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We consider the problem of scheduling N jobs on M unrelated parallel machines to minimize maximum tardiness. Each job has
a due date and requires a single stage of processing. A setup for dies is incurred if the type of the job scheduled is different
from the previous one on that machine. For each die type, the number of dies is restricted. Because of the mechanical structure
of the machines and the fitness of dies to each machine, the processing time depends on both the job and the machine. In this
paper, an efficient heuristic based on guided search, record-to-record travel, and tabu lists is presented to minimize maximum
tardiness. Computational characteristics of the proposed heuristic are evaluated through extensive experiments, which show
that the proposed heuristic outperforms a simulated annealing method tested and is able to prescribe the optimal solutions
for problems in small scales. 相似文献