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基于MDT的参数化产品设计 总被引:1,自引:0,他引:1
提出了一种基于MDT的参数化产品设计方案。该方案使产品的和非所有几何和非几何物特性全部参数化 ,并通过定义变量间的函数关联 ,在外部建立数据源 ,然后导入到MDT中 ,实现对产品所有几何和非几何变量的动态驱动 ,使设计工作的主要任务集中非几何参数的求解上。叙述了实施该方法的基本过程和要点。并以压力容器的参数化设计为便 ,阐述了该方案在设计实践中的应用。 相似文献
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针对自由阻尼结构拓扑优化问题,采用模态应变能的有限元求解方法,以单元相对密度值为拓扑设计变量,以材料用量和频率改变量为约束条件,构建以多模态损耗因子加权和为目标函数的拓扑优化模型,推导了目标函数对于设计变量灵敏度的表达式。考虑到常规优化准则法用于结构动力学寻优时,目标函数存在非凸性,迭代过程中出现负值设计变量,使得优化结果不收敛或陷入局部优化,故在一般优化准则法的基础上对拓扑优化模型进行数学意义上的迭代改进。改进优化准则法解决了设计变量出现非正及迭代发散等问题,保证了全体拓扑变量参与迭代过程。通过ANSYS编程对自由阻尼板进行了仿真,并引入MAC因子来控制结构的振型跃阶,结果显示:改进算法在控制阻尼材料体积为优化前体积60%时,各阶目标函数和拓扑构型在数次迭代后趋于稳定,单元中间密度值区域相对较少,自由阻尼结构获得了有效的减振。 相似文献
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利用数控系统所具有的宏变量编程功能,提出了一种非圆轮廓曲线圆弧拟合的加工方法。建立了圆弧拟合非圆轮廓曲线的数学模型,对加工精度进行了分析计算,设计了数控加工的程序编制流程,为数控技术人员加工非圆轮廓曲线提供了一条思路。 相似文献
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基于非概率可靠性理论和优化设计方法,将传动轴设计中的设计参数看作区间变量.建立了传动轴非概率可靠性分析模型,提出了空心传动轴非概率可靠性优化设计方法.通过工程实例的分析计算表明,该模型和方法具有一定的理论指导意义和实用价值. 相似文献
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面对新一代低能耗、高洁净注塑机面世给叶片泵配套带来冲击,该文介绍了轴向变量柱塞泵在低能耗塑机、内啮合齿轮泵在低噪声塑机的应用和无液压泵的全电动塑机,以及叶片泵在全液压塑机的应用现状。对高压叶片泵技术的未来与在注塑机市场的配套趋势作了预测。 相似文献
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槽型与反射型光电传感器外壳与其它塑料制品相比,具有尺寸小、精度高等特点.槽型与反射型光电传感器外壳的设计不仅需要满足功能、可靠性方面的要求,还需考虑模具设计与制造、注塑成型、产品装配等方面的要求.文中从材料选取、发射器与接收器的固定方式、一些主要尺寸的确定以及注塑成型过程中的常见缺陷等方面,探讨了光电传感器外壳的结构设计与制造. 相似文献
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The current development of precision plastic injection molding machines mainly focuses on how to save material and improve precision, but the two aims contradict each other. For a clamp unit, clamping precision improving depends on the design quality of the stationary platen. Compared with the parametric design of stationary platen, structural scheme design could obtain the optimization model with double objectives and multi-constraints. In this paper, a SE-160 precision plastic injection molding machine with 1600 kN clamping force is selected as the subject in the case study. During the motion of mold closing and opening, the stationary platen of SE-160 is subjected to a cyclic loading, which would cause the fatigue rupture of the tie bars in periodically long term operations. In order to reduce the deflection of the stationary platen, the FEA method is introduced to optimize the structure of the stationary platen. Firstly, an optimal topology model is established by variable density method. Then, structural topology optimizations of the stationary platen are done with the removable material from 50%, 60% to 70%. Secondly, the other two recommended optimization schemes are given and compared with the original structure. The result of performances comparison shows that the scheme II of the platen is the best one. By choosing the best alternative, the volume and the local maximal stress of the platen could be decreased, corresponding to cost-saving material and better mechanical properties. This paper proposes a structural optimization design scheme, which can save the material as well as improve the clamping precision of the precision plastic injection molding machine. 相似文献
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基于Moldflow的塑料箱注塑成型CAE分析 总被引:1,自引:0,他引:1
详细阐述了Moldflow技术的重要作用及地位,通过应用Moldflow/MPI软件对塑料箱模具进行CAE综合分析,用仿真注塑工艺参数来模拟产品的实际生产过程,显示了Moldflow技术在模具开发过程中对于优化塑料制品设计、优化塑料模设计和优化注射工艺参数等方面所起到的显著作用。 相似文献
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浅析注射成型塑料件结构设计 总被引:1,自引:0,他引:1
从注射成型塑料件结构设计的角度出发,结合材料本身特性及注塑生产的工艺特点,总结了注射成型塑料件结构设计上的一些要点和注意事项,列举了若干设计中经常采取的结构形式和改进方法,为注射成型塑料件的结构设计给出了参考。 相似文献
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Bin Ma ZhiYing Guo HuaMin Zhou DeQun Li 《The International Journal of Advanced Manufacturing Technology》2007,31(11-12):1092-1100
Virtual reality (VR), as a new technology, is integrated with software systems for engineering, design, and manufacturing. The integration has given a new impetus to the field of computer-aided engineering. This paper presents a research effort aimed at creating a virtual plastic injection molding (VPIM) environment, which is designed and implemented based on techniques such as VR, multidiscipline simulation, and scientific visualization. The VPIM system includes two parts: designing in VPIM and evaluation in VPIM. It is the first system to scrutinize virtual prototype mock-ups of new products, machines and production processes in interactive graphic simulation. During the evaluating phase, coupled to appropriate computer-based reasoning and decision-support tools and driven by data from the real manufacturing environment, a realistic impression of the process of plastic injection molding and manufacture can be achieved and can be changed interactively, and it is possible to thoroughly examine the planned system and eventually detect and remove any defects and inadequacies. The construction approach and key techniques (FEA, virtual assembly, stereoscopic display, a triangulated boundary-representation of an approximating polyhedron, collision detection, etc.) of the system are described in detail. The overall system is a powerful new approach for highly relevant industrial application of VPIM which focuses on the construction and assessment of alternate manufacturing sequences and mold design in an early design stage. Improvement of the design and manufacturing process will lead to better design and reduced development time and cost. 相似文献
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UG是目前应用越来越广泛的一种机械产品设计软件,其MoldWizard模块是注塑模具自动化设计的专业应用模块。利用该软件对学习机风扇盒盖注塑模具进行了设计研究,结果表明运用UG可大大缩短模具新产品的开发周期,降低生产成本,提高经济效益。 相似文献