共查询到19条相似文献,搜索用时 93 毫秒
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以手机外壳为例,应用CAE软件模拟了注塑件的注塑成型过程。通过正交试验方法与模拟仿真实验的结合,对注塑成型的填充、保压、冷却和翘曲变形过程进行仿真实验分析,获得了制件不同条件下的翘曲变形值。并通过对试验数据的极差分析,得到了不同工艺参数对注塑过程翘曲变形的影响程度,进而得到一组优化的工艺参数组合,同时对优化后的工艺参数组合进行仿真模拟分析,得到了符合产品要求的翘曲变形量,为同类制品的工艺参数优化提供了依据。 相似文献
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对汽车通风格栅这种塑料制品在成型的过程中容易产生的填充不足、熔接线/熔接痕、气穴、翘曲、溢料飞边等五种最为常见的缺陷进行了分析,阐述了影响格栅制品成型质量的主要因素,最后提出了防止质量缺陷的产生,获得高质量的格栅制品的措施。 相似文献
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Chenxiao Zhu Xinhua Tang Yuan He Fenggui Lu Haichao Cui 《The International Journal of Advanced Manufacturing Technology》2017,90(9-12):2513-2525
As an efficient process, narrow gap gas metal arc welding (NG-GMAW) was employed to join thick plates of 5083 Al-alloy. In this paper, arc characteristics in NG-GMAW of 5083 Al-alloy and their influence on the weld bead geometry were studied with synchronous acquisition system for various groove types, welding modes, welding current levels, and swing frequencies. The arc profiles were measured and appear to be entirely different compared with that in bead-on-plate GMAW process, meanwhile the arc size changes with varied welding mode, welding current, and arc swing frequency. Arc characteristics highly affect the weld bead geometrical parameters such as bead width, welding penetration, sidewall penetration, and weld surface concavity. Linear regressions were made between the arc characteristics and the weld bead geometrical parameters both in swing and non-swing arc process. It showed that a negative linear correlation exists between welding penetration and arc length, sidewall penetration, and arc warpage, while a positive linear correlation exists between weld surface concavity and arc warpage in non-swing arc process. In contrast, a non-linear correlation exists among them and the variation tendency remains the same in swing arc process. 相似文献
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Sachin Patil Yi Yang Tay Farzad Baratzadeh Hamid Lankarani 《Journal of Mechanical Science and Technology》2017,31(7):3225-3232
Ever increasing requirements regarding vehicle safety have led to rapid developments in various joining process. Among FSW widely used for Aluminum alloy welded structure of car body because of their remarkable performance in welding. For a better understanding of this performance, it is necessary to determine the behavior of butt weld in service conditions. In earlier phase of this study, thermo mechanical simulations and analysis are performed to understand the thermal behavior in the FSW weld zones. The developed models are correlated against published experimental results in terms of temperature profile of the weld zone. The objectives of the second part of this work is to develop and demonstrate an FE model of bumper and crash box assembly that would improve on the current modeling techniques for the mechanical response of welds in structural problems. 相似文献
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针对注塑件有限元翘曲分析存在的整体量化与工艺参数优化问题,通过二次开发实现了注塑件翘曲的综合量化。结合正交实验设计,得出影响翘曲大小的工艺参数贡献度,从而获得多参数优化组合,实现了注塑件翘曲优化。 相似文献
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Injection molding optimization with weld line design constraint using distributed multi-population genetic algorithm 总被引:1,自引:1,他引:0
Chun-Yin Wu Chih-Chiang Ku Hsin-Yi Pai 《The International Journal of Advanced Manufacturing Technology》2011,52(1-4):131-141
Weld lines not only detract from an injection-molded part??s surface quality, but also significantly reduce its mechanical strength. It is not always easy to completely eliminate weld lines by simply adjusting the relevant injection mold design or the molding conditions. One solution is to prevent the weld lines from forming in regions that are structurally or aesthetically sensitive. The influence of weld lines on the quality of injection-molded parts cannot be overlooked and weld lines should be regarded as an important design constraint, especially for parts with aesthetic concerns. Since precisely predicting the number of weld lines and their positions and lengths is difficult without executing simulation routines, especially when part geometry is considered a design variable, this study adopts an enhanced genetic algorithm, referred to as distributed multi-population genetic algorithm (DMPGA), combining an optimization algorithm and commercial MoldFlow software with a dominance-based constraint-handling technique and a master?Cslave distributed architecture. MoldFlow obtains relevant data regarding warpage and weld lines and evaluates the corresponding designs. The dominance-based constraint-handling technique handles the weld line design constraint without needing additional penalty factors. Finally, the master?Cslave distributed architecture reduces the formidable computational time required for injection molding optimization. To illustrate the high viability of DMPGA, this study provides an outer frame of a digital photo frame as an optimization example. The results of this study show that DMPGA cannot only effectively decrease maximum part warpage without violating the weld line constraint, but also conquer hurdles attributed to constraint handling and computational demand. 相似文献
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以塑料碗的注塑模设计为例,借助模流分析软件Moldflow对其充模时间、注射压力、体积收缩、气穴和熔接痕等进行模拟分析,根据结果有针对性地优化模具设计方案,从而可以提高制品质量,缩短模具设计制造和产品开发周期. 相似文献
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An effective warpage optimization method in injection molding based on the Kriging model 总被引:3,自引:3,他引:0
Yuehua Gao Xicheng Wang 《The International Journal of Advanced Manufacturing Technology》2008,37(9-10):953-960
In this paper, an effective optimization method using the Kriging model is proposed to minimize the warpage in injection molding. The warpage deformations are nonlinear, implicit functions of the process conditions, which are typically evaluated by the solution of finite element (FE) equations, a complicated task which often involves huge computational effort. The Kriging model can build an approximate function relationship between warpage and the process conditions, replacing the expensive FE reanalysis of warpage in the optimization. In addition, a “space-filing” sampling strategy for the Kriging model, named rectangular grid, is modified. Moldflow Corporation’s Plastics Insight software is used to analyze the warpage deformations of the injection-molded parts. As an example, the warpage of a cellular phone cover is investigated, where the mold temperature, melt temperature, injection time, and packing pressure are regarded as the design variables. The result shows that the proposed optimization method can effectively decrease the warpage deformations of the cellular phone cover and that the injection time has the most important influence on warpage in the chosen range. 相似文献
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Jonnathan D. SANTOS Jorge I. FAJARDO Alvaro R. CUJI Jaime A. GARCÍ A Luis E. GARZÓ N Luis M. LÓ PEZ 《Frontiers of Mechanical Engineering》2015,10(3):287
A polymeric natural fiber-reinforced composite is developed by extrusion and injection molding process. The shrinkage and warpage of high-density polyethylene reinforced with short natural fibers of Guadua angustifolia Kunth are analyzed by experimental measurements and computer simulations. Autodesk Moldflow® and Solid Works® are employed to simulate both volumetric shrinkage and warpage of injected parts at different configurations: 0 wt.%, 20 wt.%, 30 wt.% and 40 wt.% reinforcing on shrinkage and warpage behavior of polymer composite. Become evident the restrictive effect of reinforcing on the volumetric shrinkage and warpage of injected parts. The results indicate that volumetric shrinkage of natural composite is reduced up to 58% with fiber increasing, whereas the warpage shows a reduction form 79% to 86% with major fiber content. These results suggest that it is a highly beneficial use of natural fibers to improve the assembly properties of polymeric natural fiber-reinforced composites. 相似文献
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利用Moldflow分析软件,采用数值模拟的方法分析了料温、模具温度、注射时间、冷却时间和保压压力等工艺参数的变化对塑件产品翘曲的影响趋势及其原因。结果表明:对所选参数,保压压力对塑件翘曲的影响最为显著,且保压压力取注射压力的95%左右可使产品的翘曲量达到较小的程度;产品翘曲量随料温升高,注射时间减短而减小;冷却时间对翘曲量的影响甚微;模具温度对翘曲影响较为复杂。根据分析结果,优化了塑件的成型工艺参数,使得翘曲量进一步减小。 相似文献
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Dong-Kyou Park 《Journal of Mechanical Science and Technology》2011,25(12):3107-3114
This paper presents a simple analysis model for bumper barrier impact and new IIHS (Insurance Institute for Highway Safety)
bumper impact instead of a non-linear finite element impact analysis. A dynamically equivalent beam approach was introduced
to simplify the non-linear dynamic bumper impact. For a bumper barrier impact, the equivalent curved-beam element was substituted
for the bumper beam and the bumper foam. For a new IIHS bumper impact, a modified curved-beam element of bumper barrier impact
considering the effect of contoured new IIHS impact barrier was used. The accuracy of this simple analysis model was tested
by comparing its results with those of the non-linear finite element analysis. Tested bumper beam types were press type beam
and roll forming beam used widely in the current car bumpers. The maximum displacement error between the two models did not
exceed 1.95% for a barrier impact and 13.2% for a new IIHS bumper impact. This accuracy is good enough to be used in the early
stage of bumper beam design process. This simple analysis model is expected to reduce the car development time and tests cost
significantly. 相似文献