共查询到19条相似文献,搜索用时 234 毫秒
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基于反求工程的车身覆盖件的开发技术研究 总被引:1,自引:0,他引:1
通过对汽车车身覆盖件的逆向设计及数控加工,详细阐述了反求过程中数据测量、曲线曲面重构及反求模型的数控加工,介绍了一种将逆向设计与数控雕铣机直接对接的加工方法.结果表明这一方法为新车型的开发提供了方便、快捷的途径,对提高国内汽车生产厂家开发新车型提供了依据. 相似文献
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Imageware在摩托车覆盖件反求工程中的应用 总被引:3,自引:0,他引:3
介绍了反求工程的含义及工作流程,阐述了摩托车覆盖件的三维点云数据采集,讨论了利用反求工程软件Imageware对摩托车覆盖件点云数据处理并进行曲面重构的过程。 相似文献
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通过对特征,建模方法的阐述,介绍了基于特征建模的基本工作原理及其作用.分析车身各构件的特征并根据特征给车身分块.研究基于特征的车身覆盖件参数化建模方法,在车身覆盖件建模中引入了特征建模概念,针对车身覆盖件的结构特点及其形状特征的生成机理,提出车身覆盖件形状特征分类方法,最后以Pro/E软件系统建立车身曲面组件为例阐明建立车身三维模型过程. 相似文献
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以汽车某覆盖件为例,通过对数据采集、测量数据的处理、曲面重构、实体造型、落料件的反求、成形过程模拟仿真几个步骤来说明如何利用MasterCAM进行反求及数控加工仿真. 相似文献
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文章基于CATIA自由曲面反求技术,对车身曲面设计进行了研究。通过对宝马三视图的数据采集和处理、曲面的构建以及曲面分析,进行车身曲面的数字化建模,反求出汽车曲面的三维数字模型。解决了通过三视图实现快速逆向工程实体三维数字建模问题。 相似文献
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基于逆向工程的汽车前盖再设计研究 总被引:1,自引:0,他引:1
利用逆向工程技术对汽车前盖进行了再设计,采用三维激光扫描设备和逆向工程软件.经过数据预处理、曲面重构等过程,得到汽车产品的初步结构模型,然后把得到的三维模型导入三维造型软件中,进行相关的结构再设计,结果表明,所搭建的新产品快速制造系统对提高汽车产品的开发质量和效率具有重要的意义。 相似文献
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M. Golzar M. Poorzeinolabedin 《The International Journal of Advanced Manufacturing Technology》2010,49(9-12):1037-1045
This paper describes the integrated fabrication and assembly approach used to replace a steel body cover in Samand Sarir automobile by composite one because composite could perform higher mechanical performance, i.e., strength, stiffness, and impact absorption energy at low velocity. Considering the integrated body as base design criteria, the steel cover is redesigned and fabricated by composite material. Tensile, flexural, and charpy impact tests were carried out to determine the properties of woven fabric laminated composite in [0/90°] and [±45°] fiber orientations. The selected composite laminate shows 2.9 times impact resistance; its desirability factors are improved 1.8 times for strength and 3.35 times for stiffness. Using finite element method, the impact of the composite body cover was simulated by ABAQUS for several thicknesses and fiber orientations. The FEM results indicate that finally laminated composite [0/90°]7 can improve the crashworthiness of composite part in comparing to steel body cover. The integrated 3D preform of glass woven fabric was stitched like the shape of 3D model of body cover and placed in mold for prototype fabrication. It can be concluded that vacuum bagging as suggested fabrication method could be suitable for 3,000–5,000 annual production volume. Eventually, the fabricated composite body cover weighed 1.7 kg, which is 42% lighter than the steel body cover. 相似文献
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传统的汽车前端是非模块化设计的,一般由10~ 20个钢制冲压零件焊接成一个框架,然后将散热器、车灯和锁等零/部件分别安装在钢制框架上.此钢制框架属于车身的一部分,重量重、焊接组装复杂,成本高.因此,提出采用一种玻纤增强的复合材料整体注塑成型的全塑料框架,替代传统的钢制框架,集成汽车前端各种零件,形成一个大的模块组件,然后整体装在车身上.与传统的汽车前端相比,不但安装与拆卸方便,且使车身前端重量减轻,成本降低,是未来汽车行业发展的趋势所在.重点对其刚度进行了详细的研究. 相似文献
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Muhsin Kiliç Gökhan Sevilgen 《The International Journal of Advanced Manufacturing Technology》2012,60(5-8):799-809
A three-dimensional (3-D) transient numerical analysis was performed inside an automobile cabin during cooling period. A three-dimensional vehicle cabin including glazing surfaces was modelled by using the real dimensions of a car. A virtual manikin with real dimensions and physiological shape was added to the model of the vehicle cabin, and it was assumed that the manikin surfaces were subjected to constant temperature. The virtual manikin was divided into 17 parts in standing posture to evaluate the local heat transfer characteristics of the human body during transient cooling period. We considered three different cases that the cooling capacity of the automobile cabin was same for all cases. Three-dimensional fluid flow, temperature distribution and heat transfer characteristics inside the automobile cabin were calculated with different type of inlet vents. Comparisons of the numerical results were presented and discussed. 相似文献
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汽车覆盖件用淬硬钢模具铣削加工的研究进展 总被引:2,自引:0,他引:2
作为汽车产销量第一大国,我国的汽车模具加工能力远远不能适应汽车更新换型的需要,中高档轿车关键覆盖件模具铣削加工质量还达不到设计要求。通过汽车大型覆盖件淬硬钢模具的铣削加工特征和难点的分析可知,铣削过程建模与仿真分析、加工工艺系统动力学特性和铣削稳定性分析、汽车覆盖件淬硬钢模具铣削加工用刀具研制、自由曲面数控编程技术及工艺规划是汽车模具高精度铣削加工的研究重点,总结归纳这几个方面的研究现状,同时探讨汽车覆盖件淬硬钢模具铣削加工仍有待于进一步解决的问题,为其后续研究方向提出一些建议。 相似文献
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为了解决大型铸件模型的数控加工问题,提出了铸型分块坎合组装加工制造方法的思想以及其应用场合和采用原则,并以汽车门覆盖件检测模具为案例,采用分块坎合组装加工可可以显著提高铸型加工效率,实现了大型复杂铸型的数控加工。 相似文献