基于虚拟仿真分析对地板梁电泳结构设置的探讨

泳透性分析是涂装SE工作的关键内容之一.利用仿真软件对特定的汽车零部件开设不同的电泳结构,对比各方案的计算结果,总结出电泳孔孔径大小、数量和排布形式对泳透性的影响规律,从涂装SE应用分析工作角度出发,将仿真计算结果总结形成标准和要求,以期对后续新车型的电泳孔设定和涂装SE分析工作有一定参考意义.     

浅谈汽车涂装电泳SE分析原则

从车身涂装SE分析角度出发,探讨了汽车涂装SE分析原理,重点对电泳SE的分析原理进行了讲解,避免后期结构更改和现场改造出现的质量问题和成本浪费。     

浅析设计阶段涂装SE分析及标准

结合现场生产线实际情况,对汽车产品设计阶段涂装SE分析的内容及标准进行了介绍,以白车身为对象,对涂装工艺可行性、防腐性、密封性等进行了工艺分析。     

浅谈涂装SE对侧围电泳性的分析要点

从涂装SE角度出发,结合车身结构设计理念,对车身设计过程中侧围总成结构设计中应注意的涂装电泳性问题进行了分析,并给出了参考标准,以期对车身侧围总成结构设计起到指导作用。     

通过涂装SE分析降低项目投资

在新车型开发过程中需要对产品数据进行涂装SE分析,在保证产品质量的前提下尽可能节约新车型项目投资。本文主要是就如何降低新车型项目投资对前期SE分析经验进行总结,归纳出涂装SE分析的一些要点及方法,仅供同行人员参考。     

汽车涂装同步工程中机器人喷漆结构分析

从车身涂装SE分析角度出发,探讨了车身结构与机器人喷漆、车身外观效果之间的关系,分别从车身结构、工装精度、喷漆调试等方面阐述了SE分析的要求和应用。     

新车型开发中的涂装SE分析

在新车型开发的同时,对汽车生产的工艺性和操作性进行分析,能有效减少后期的设计变更以及设计研发费用,这就是所谓的"同步工程"(SE)。阐述了涂装过程的SE分析。     

汽车涂装同步工程分析中应注意的有关车身结构的若干问题

从汽车同步工程(SE)的角度出发,探讨了车身结构与最终漆膜质量的联系,分别从车身间隙、冲压制件结构、焊接搭接方式以及装配孔结构这4个方面举例阐述了涂装过程SE分析的应用和效果。     

浅谈汽车涂装SE阶段车身涂胶工艺分析

介绍了汽车涂装SE阶段涂胶工艺分析的主要内容,同时结合典型问题提出优化建议,以提高新产品的可涂胶性。     

涂装SE通过性实例分析

介绍了与汽车开发过程同步进行的汽车涂装同步工程(SE)通过性分析的主要内容,包括机械化设备分析、非标设备分析、电气自动化分析和车间物流分析。     

车用塑料件涂料及其涂装

阐述了汽车塑料件涂料涂装常见的失效形式及分析、塑料件损伤的修理方法和车用塑料件涂装常见的涂料种类。同时介绍了汽车塑料件的喷涂前处理、喷涂施工及硬塑料件的喷涂方法。     

Relation between chip resistance and mechanical properties of automotive coatings

This work addresses the correlation between stone-chip resistance and mechanical properties of automotive solid colour coating systems. Single-impact tests, which are believed to realistically simulate chipping due to stone impact, were performed to investigate eight different coating systems. Additionally, conventional tests on chip resistance currently used in automotive industry were performed. Results were related to mechanical properties of the coatings, measured by dynamic mechanical thermal analysis and double cantilever adhesion test. It is found that coating systems with a low glass transition temperature for the primer have better stone-chip resistance.     

浅谈涂装车间的工艺管理

汽车涂装的质量取决于涂装工艺、涂装材料及涂装工艺管理,涂装工艺管理是一个衡量涂装工业水平最重要的因素,也是影响涂装质量的最重要因素,正所谓三分材料七分管理。以奇瑞涂装车间12线为例介绍日常涂装工艺管理的相关工作。     

Synthesis and characterization of a novel hydroxyl-terminated polydimethylsiloxane for application in the silicone-modified acrylic-grafted polyester resins

Monoallyl-end-capped polypropylene glycol (MPG) was successfully synthesized by the reaction of polypropylene glycol and allyl chloride. Also, hydrogen-terminated polydimethylsiloxane (H-PDMS) was prepared by the reaction of dichlorodimethylsilane and chlorodimethylsilane (CDMS). Then, MPG and H-PDMS were reacted to produce hydroxyl-terminated polydimethylsiloxane (OH-PDMS) as silicone which is used to prepare automotive pre-painted or coil-coated metals (PCM). This pre-coated metal PCM system was investigated to remove the wet-coating process, such as pre-treatment and spray coating for environmental regulations. However, automotive pre-coated metal must have high flexibility and stiffness to overcome the harsh conditions such as those encountered in the cutting, pressing, and stamping process. For these reasons, a series of silicone-modified acrylic-grafted polyester (SAGP) resins (e.g. SAGP-0–SAGP-10) were designed to satisfy both the hardness and the flexibility for an automotive PCM. The OH-PDMS (silicone) was characterized by Fourier transform-infrared (FT-IR), ¹H-NMR, and ¹³C-NMR spectroscopic techniques. The results showed that the targeted product was successfully carried out. The structural elucidation of the synthesized SAGP was carried out by FT-IR spectroscopic technique. Thermal properties of the resins were studied using thermogravimetric analysis and differential scanning calorimetry. The flexibility of the resins was measured by tensile test. The contact angle measurement can be measured by the water repellence of the coating surface, which is a standard method to evaluate cleanable characteristics. The surface free energy was calculated by the contact angle measurement.     

Decreasing paint cost for sheet molding compound (SMC) compression molding

Finishing, in most cases, is the most expensive step for manufacturing plastic parts in automotive and truck industry; being electrostatic painting is the desired approach for improved quality. For plastic parts to be painted electrostatically, a conductive primer needs to be applied first. In the case of SMC compression molded parts, in-mold coating (IMC) is the primer material of choice, as it also serves to fill the surface porosity typical in SMC parts. To make the IMC conductive, the current approach is to add carbon black (CB), which results in a black colored primer. In this research, single wall carbon nanotube (SWCNT) was evaluated, as an alternative to CB, to develop a clearer version of conductive IMC. The effect of SWCNTs on both degree of lightness and electrical conductivity was experimentally evaluated. The results indicate that a clearer and slightly more conductive coating than standard IMC can be obtained by adding 0.15 wt% SWCNTs into the base IMC resin, which results in approximately 12.5% paint saving compared to standard IMC. The processability of the modified coating was shown to be only slightly less favorable than standard coating.     

车身斜条纹缺陷的成因分析与对策

介绍了微型车涂装生产线上电泳前车身局部斜条纹缺陷成因分析及解决对策,既消除了斜条纹缺陷,又延长了磷化倒槽周期,降低了生产成本。     

汽车部件用粉末涂料概况

概述了汽车部件用粉末涂料技术的发展历史及应用现状,根据粉末涂料在汽车部件(包括车身、发动机、轮毂、底盘等)应用的特性要求,指出汽车不同部件应选用相对应的粉末涂料体系,并列出不同粉末涂层的具体检测标准,为汽车粉末涂料的开发提供参考性依据,并展望今后汽车用粉末涂料技术的发展动向和应用前景。     

紫外光固化涂料在汽车涂装上的应用

概述了紫外光固化涂料在汽车塑料部件、修补漆、面漆上的应用,并展望了紫外光固化涂料在汽车涂装上的发展趋势。     

Synthesis and characterization of elastomeric polyester coatings for automotive pre-coated metal

An automotive pre-coated metal system (PCM) has been investigated to replace wet coating process, such as pre-treatment, dip coating and spray coating, to address environmental regulations. However, automotive pre-coated metal sheets must have high flexibility and stiffness to overcome harsh conditions such as cutting, press and stamping processes. For these reasons, elastomeric polyester coatings were designed to improve scratch resistance and to impart reflow characteristic for an automotive PCM. The characteristics, curing behavior and viscoelastic property of the resins were measured by ¹H NMR, GPC, RPT and DMA. The flexibility was evaluated using a texture analyzer. A nano scratch tester, equipped with an optical microscope was used to measure the scratch resistance of coatings and the scratched surface morphology. An Amtec laboratory car wash test and a sharp knife were used to evaluate the reflow property of the coatings. Change of the damaged surface morphology was measured using a mini-SEM.     

Rheological Properties of Epoxy/Polypyrrole Coating and its Behavior as EMI Material

In this study, we analyze the rheological properties of epoxy/polypyrrole/carbon black coating and its performance as electromagnetic interference shielding efficiency (EMI SE). For this purpose, a commercial epoxy coating was mixed with a conductive polymer, namely polypyrrole. Rheological tests were performed to obtain the flow curve, the storage and loss moduli, the cure time and thixotropic characteristics. Thermal analysis of DSC (cure behavior) and EMI SE were also performed. Epoxy coating showed non‐Newtonian (shear thinning) behavior. The addition of PPy.DBSA reduced the coating fluidity by the increase in consistency index and viscosity. The stress oscillatory amplitude sweep test was performed to determine the linear viscoelastic range. The results of the LVR stress and strain frequency sweep tests were compared to the PPy.DBSA. The results show that LVR and critical crossover change with the percent of Polypyrrole. The cure times obtained by the rheometer and DSC were in good agreement: the addition of polypyrrole reduced the cure time, probably due to the presence of amino groups in the PPy.DBSA, which can react with the oxirane ring in the epoxy resin. The EMI SE attenuation by absorption and reflection mechanism was observed by adding 10 phr of PPy.DBSA. For practical applications, it is necessary to combine polypyrrole with conducting carbon black. The formulation with 1.5 phr of carbon black improves the EMI SE performance to 72%. J. VINYL ADDIT. TECHNOL., 26:348–353, 2020. © 2019 Society of Plastics Engineers