乘用车后回复反射器光度性能试验研究

介绍回复反射器光度试验原理,分析观察角α对回复反射器光度性能的影响。最后,以某乘用车回复反射器作为研究对象,用三维视图表达不同观察角下的回复反射器配光性能分布,为回复反射器的光度性能研发和设计提供依据。     

自行车反射器注塑工艺研究

该根据作在日本企业对反射器半年多的研修和在国内反射器制造业数十年的工作经验。较祥尽地描述了注塑工艺参数的变化对反射器光学性能的影响。并对提高反射器产品的光性能(反光强度)提出了具体的解决方法。     

摩托信息

摩托车强检项目增为21项 近日,国家经贸委与公安部联合发布了《关于进一步加强车辆公告管理和注册登记有关事项的通知》,摩托车强检项目将由现在的18项调整为21项,其中新增回复反射器、光信号装置配光性能、照明及光信号装置的安装3项;工况法排放、加速噪声、喇叭声级、无线电干扰4项将依据新版国标进行检测;前照灯配光性能将由观察项转为否定项。 国家摩托车监督检测中心(天津)认证室主任赵立棣介绍说,工况法排放新版标准GB14622-2000和     

深化公告管理制度改革拉动行业企业技术进步—国家摩托车监督检测中心（天津）认证室负责人就强检项目调整答记者问

根据国家经贸委与公安部联合发布的《关于进一步加强车辆公告管理和注册登记有关事项的通知》,摩托车强检项目将由现在的18项调整为21项,其中新增回复反射器、光信号装置配光性能、照明及光信号装置的安装3项;工况法排放、加速噪声、喇叭声级、无线电干扰4项将依据新版国标进行检测;前照灯配光性能将由观察项转为否定项。就强检项目调整问题,记者日前采访了国家摩托车监督检测中心(天津)认证室主任赵立棣。 问:为什么国家主管部门对摩托车强检项目作如此调整?     

反射器在自行车上的应用

反射器——是通过其他光源照射后,反射给被照方识别的器件。至于它应用于自行车的年代、何人发明,我尚无考证过。小时候看到的自行车上反射器,由橡胶压铸外壳,平面嵌入红色面罩；近年采用注塑成型壳体,再用胶水将红色面罩胶在壳体平面     

道路照明配光设计中弯道照明的优化研究

根据弯道照明设计的特点和难点,对弯道照明的配光性能进行研究。选定灯具情况下分析弯道路灯安装条件的优化,并从节能角度,对弯道路灯的配光分布进行优化设计,得到不同弯道及安装条件下灯具的优化配光分布,其既可满足照明要求,又可控制过度照明。     

《摩托车光信号装置配光性能》等国家标准（送审稿）通过审议

全国汽车标准化委员会灯具及灯光分委会年会暨标准审查会于2006年底在山西太原举行。会议审议了2项强制性国家标准《摩托车光信号装置配光性能》和《机动车回复反射器》的修订送审稿。建议有关机构对照标准(送审稿)内容,及时采取相应措施,添置必需的生产和检测设备,以确保标准发布后能有效实施。     

汽车新产品40项强制性检验项目说明(二)

从表中可看出,40项强制性检验项目比原34项强制性检验项目增加了5项(汽车及挂车后雾灯配光性能、乘员碰撞保护、压燃式发动机和装用压燃式发动机的车辆排气污染物限值及测试方法、汽车和挂车号牌板(架)及其位置、车用汽油机排气污染物排放)。另外,有些强制性标准进行了重新修订和制订,如汽车制动系统结构、性能和试验方法、机动车回复反射器、汽车及挂车外部照明和     

基于Matlab的后牌照板照明装置配光试验结果评判

介绍后牌照板照明装置的配光试验要求,通过Matlab编程实现后牌照灯配光试验结果的评判,解决手动测试设备只能测试亮度值不能进行结果评判的缺陷。最后,以某后牌照灯配光试验为例,验证了该Matlab程序的有效性。     

反射器制造业现状与对策

反射器作为自行车安全标志的一个特殊部件，始创于1930年。70年代中后期，当时的上海自行车公司所属上海自行车零件厂开始对这一技术进行研究，开发了“菱光牌”自行车反射器。80年代初，广东顺德勒流自行车灯厂从国外引进反射器模具生产自行车反射器，与此同时，上海自行车公司与德国合资成立的华德塑料制品有限公司也从德国引进了反射器模具生产自行车反射器。同时天津大学、天津勃海无线电厂也相继开始研制反射器模具。从而掀起了我国开发研究制造反射器的热潮。90年代初，     

Gate shape optimization using design of experiment to reduce the shear rate around the gate

Numerical analysis is used to optimize the gate shape of the mold part in the molding process. The objective of this research was to develop a procedure that will optimize the gate shape of the mold part by using Design of Experiments approach. The computer-aided engineering software Moldflow was used to simulate the plastic injection molding process and the Minitab software was used to analyze the computational results from Moldflow. The Bulk Molding Compounds (BMC) UNI-203S thermoset material was chosen as the molding material. Four different types of gate shapes were analyzed to find the gate shape to be used in the optimization. The Type 3 gate shape was selected as basis for the gate optimization because this shape yielded the minimum shear rate around the gate among all. The thickness, width, length and angle of the gate were selected as the design variables. Erosion around a gate due to repetitive shear flow during molding process was considered as an important issue to extend the service life of the expensive mold. It is normally very difficult to prevent erosion due to high injection pressure and repetitive use of the mold, especially in certain molding parts as BMC reflector in automotive parts, so it has become the subject of researches. The effectiveness of design variables was evaluated by observing shear rate around the gate. The objective of the optimization was to minimize the average shear rate around the gate. Response Surface Method was applied to identify the optimum values of the design variables. The computed optimum values were validated numerically. The optimized gate shape showed the reduced shear rate by about 11%.     

汽车注塑产品生产工艺及成本分析

为了推进汽车轻量化,塑料零部件被广泛应用,其中注塑件的应用尤为突出。为了提高塑料制品的产品竞争力,了解汽车注塑件的生产工艺、注塑成型的要点、设备选择及成本构成是控制成本的有效方法、是推广应用的价值所在,是开展价值工程的源泉。生产与成本的有机结合、工艺与价值的相辅相成将为节能汽车的开发添砖加瓦。     

发动机进气歧管注塑模具浇口数量与位置优化

为了研究注塑模具浇口对发动机塑料进气歧管成型质量的影响,缩短进气歧管开发周期,降低成本,提高产品质量,利用Moldflow软件对塑料进气歧管注塑成型中浇口位置及数量进行流动模拟分析,预测可能存在的气泡位置和熔接痕位置,通过比较分析来确定制品注塑成型中的浇口位置和数量。分析结果表明,采用呈规则几何形状分布的4个点浇口为最佳选择。试验证明:按照模拟结果制造模具,试制的产品样件质量较好。     

上汽通用五菱供应商注塑机台统计分析

上汽通用五菱汽车股份有限公司(下面简称“上通五”)曾经作为在国内连续十几年的单一车企销量冠军,年产销量在2015年就已突破200万辆大关,打造过多个爆火车型,一度被网友们称作“神车”专业户。上通五连续多年巨大的年产销量,多个爆火车型的快速上量对供应商的生产能力也提出了巨大的挑战。本文将对上通五注塑件供应商的注塑能力做主要分析,全面统计上通五在柳州,青岛,重庆三个基地的供应商注塑机台不同吨位区间的机台数量,产能利用率,自动化普及率及注塑机台的综合评分等信息。掌握现有注塑机台的信息将有助于推进供应商的专业化发展,提前识别潜在的产能风险,面对供应商产能不足的情况能快速制定解决措施,平衡各供应商的业务,提升供应商现有的产能利用率,推进设备技术参数统一便于零件平台化设计,识别优质供应商资源建立战略合作关系。     

轿车前照灯配光镜注塑工艺优化

轿车前照灯配光镜采用聚碳酸酯(PC)料制作。为克服在注塑中前照灯配光镜出现缺陷,对注塑中工艺进行了优化设置,从选材、设备及工艺参数设置等进行了分析,对烘料设备改进和3台模温机的应用提出了独特想法。产品注塑位置详细计算和成型过程得到较好的控制,解决了成型配光镜中出现的缺陷。经生产实践验证,工艺参数优化设置合理,能防止产品缺陷,保证质量可行,配光镜能得到用户的认同。     

Design of conformal cooling channels for an automotive part

The cooling system plays a crucial role in determining the productivity and quality of an injection molding process. With the current growth of Solid Freeform Fabrication (SFF) techniques, mold designers have been striving for not only improvement in cooling system performance but also for a method to do so automatically. In this paper, a method is proposed for developing a conformal cooling system that facilitates uniform cooling over the entire mold surface with minimum cycle time. Based on the temperature distribution after the filling stage, the mold surface is split into zones which will be cooled by optimized subconformal channels obtained from the optimization process. The optimization process in which the objective function is stated as minimization of the cooling time with boundaries ensuring a realistic design will optimize the cooling system layout in terms of cooling channel size and location. Finally, all subcooling channels are combined to generate the entire conformal cooling system for the injection mold.     

某车型空调控制器IMD工艺面板起泡问题改进分析

随着生活水平的提高,消费者对汽车的舒适性要求越来越高。汽车空调控制器是整车空调系统的重要组成部分之一,也是汽车车内重要的内饰组成部分。汽车空调控制器不仅能够控制整车空调系统的工作,还有提升座舱美观的作用,对提高整车的驾乘舒适性起到非常重要的作用。汽车空调控制器一般由电路板(PCBA)、后壳、面板组成。在面板的制作工艺中有常规的注塑喷漆工艺,也有目前流行的模内注塑工艺(IMD),本文主要对模内注塑工艺导致的后期空调控制器面板起泡问题进行分析。     

Fatigue life estimation of injection mold core using simulation-based approach

The purpose of this study is to present a simulation-based approach capable of predicting the fatigue life of a mold core with the help of CAE technology based on injection molding simulation, core stress analysis and fatigue life prediction. Injection molding simulation is performed in order to obtain the non-uniform pressure acting on a mold core due to the polymer melt flow during injection molding process. Subsequently, the melt pressure profile is used as loading condition for core stress analysis via one-way coupling technique. The lifetime of a mold core is then predicted by fatigue analysis with stress-life approach. For verification of simulation-based approach to the fatigue life prediction, tests were also performed.     

Effect of fuel stratification on initial flame development: Part 3-high swirl condition

This paper discusses the final investigation into the effect of fuel stratification on flame propagation. In previous works, the characteristics under the no port-generated swirl condition and the low-swirl condition were considered. For this purpose, the initial flame development and propagation were visualized under different axially stratified states in a modified optical single-cylinder SI engine. The images were captured by an intensified CCD camera through the quartz window mounted in the piston. Stratification was controlled by the combination of the port swirl ratio and injection timing. These were averaged and processed to characterize the flame propagation. The flame stability was estimated by the weighted average of flame area and luminosity. The stability was also evaluated through the standard deviation of flame area and propagation distance and through the mean absolute deviation of the propagation direction. The results show that the LML is expanded remarkably under the high-swirl cases up to the highest relative AFRs of 1.71 and 1.75 between 140 and 160CA. In addition, similar to the low-swirl condition, the flame-flow interaction determines the direction of flame propagation, and the governing roles of the two factors vary according to the swirl level; the flow is more important at the higher swirl conditions, and the flame is more important at the lower swirl condition. Finally, fast and stable flame propagation can be achieved under the preferably stratified condition, which is induced by the suitable combination of the high swirl and injection timing.     

Influence of injection parameters on the transition from PCCI combustion to diffusion combustion in a small-bore HSDI diesel engine

In this paper, the influence of injection parameters on the transition from Premixed Charge Combustion Ignition (PCCI) combustion to conventional diesel combustion was investigated in an optically accessible High-Speed Direct-Injection (HSDI) diesel engine using multiple injection strategies. The heat release characteristics were analyzed using incylinder pressure for different operating conditions. The whole cycle combustion process was visualized with a high-speed video camera by simultaneously capturing the natural flame luminosity from both the bottom of the optical piston and the side window, showing the three dimensional combustion structure within the combustion chamber. Eight operating conditions were selected to address the influences of injection pressure, injection timing, and fuel quantity of the first injection on the development of second injection combustion. For some cases with early first injection timing and a small fuel quantity, no liquid fuel is found when luminous flame points appear, which shows that premixed combustion occurs for these cases. However, with the increase of first injection fuel quantity and retardation of the first injection timing, the combustion mode transitions from PCCI combustion to diffusion flame combustion, with liquid fuel being injected into the hot flame. The observed combustion phenomena are mainly determined by the ambient temperature and pressure at the start of the second injection event. The start-of-injection ambient conditions are greatly influenced by the first injection timing, fuel quantity, and injection pressure. Small fuel quantity and early injection timing of the first injection event and high injection pressure are preferable for low sooting combustion.