ABS塑料件多层"湿碰湿"涂装新工艺

对ABS塑料多层涂装工艺进行了探讨,指出采用"湿碰湿"工艺可提高生产效率和产品合格率,涂层各项性能指标合格.     

机床涂装工艺浅述

我国现阶段机床产品的涂装工艺仍以小批量、手工为主,随着机床零部件质量的提高以及规模化生产,原有机床涂装方式已不适合现代机床工业的生产.通过对机床产品特性的分析和方案比较,提出了机床产品涂装工艺设计和平面布置,并介绍了主要的涂装设备:水旋喷漆室、油漆烘干室、多功能喷涂打磨室.通过对机床涂装工艺合理的设计,使得工件可以按产品特性组织批量生产.     

阴极电泳涂装在我厂的应用

我厂以前采用自泳漆工艺作为车身漆膜底层,因自泳漆的质量不稳定,其漆膜耐溶剂性、耐候性较差。为了解决这一难题,厂部新建了一条年产量为40000台的通过式阴极电泳底漆线。该线主要采用国产设备,自行安装,关键设备用进口件,如超滤系统、自动温控系统、药液自动补加控制系统等,为产品的优质优产打下了良好的基础。 1 工艺流程 车身上线→人工擦洗→预脱脂→脱脂→第一喷淋水洗→第二喷淋水洗→表调→磷化→第三喷淋水洗→第四喷淋水洗→第五喷淋水洗→循环纯水洗→新鲜纯水洗→热风吹干→强冷→阴极电泳→电泳后冲洗→电泳烘干→进入储备线。 从车身上线至电泳烘干后进入储备线,整个工艺流程约需3.5h。 2 存在问题 (1)因预脱脂槽、脱脂槽采用直接和间接两种相结合的蒸汽加热方式加热工作液,工作液损失大,工艺参数难以控制;另外油水分离系统因设计不合理,一直无法正常使用,致使工作液油污含量过高,只能采用更换槽液或补加一些活性剂来暂时弥补这一缺陷,以确保除油效果。 (2)磷化加热系统加热面积过小,影响加热速度。我厂该线磷化槽工作液共120t,工作温度要求40～50℃,但只有两套20m~2板式换热系统加热工作液。冬天,因厂蒸汽用量大,压力较低,常常需加热3～4h,才达到工作温度,影响了生产进度,也加重了     

叉车一次性涂装工艺改造

１引言 目前国内叉车行业具有批量小、品种多的特点，决定了叉车涂装与汽车涂装的不同。 早期主要采用的叉车涂装工艺是将零部件预涂底漆、装配后再整车手工喷涂、自然干燥，涂料一般为低档的过氯乙烯类材料，装饰性较差，基本上没有涂装装备。１９８５年后，随着对叉车涂装质量要求的提高，出现了整车喷涂涂装线，并增加了６０℃以下的烘干工序。随着市场经济的发展，人们对叉车的外观涂层的装饰性、耐腐蚀性提出了更高的要求，同时对控制叉车涂装生产所带来的环境污染也有了更严格的规定，有必要对传统的涂装工艺及装备进行改革。本厂运用…     

108t矿用自卸车的涂装工艺管理

介绍了１０８ｔ矿用自卸车表面涂装工艺方案的确定与准备、工艺生产与质量管理等方面的情况，指出，实施一个完善的工艺方案是与高质量的工艺管理相畏相成的。     

客车构件涂装前处理工艺

客车构件在涂装前通过脱脂、除锈、防锈、表调、磷化等工序 ,将工件表面的油污、锈蚀、疏松的氧化层、灰尘等除净 ,为整体涂装提供清洁表面 ,同时多孔性的磷化膜能显著提高涂膜附着力和耐蚀性。我公司采用喷淋式前处理生产线一年多来 ,积累了一些生产实践经验 ,介绍如下。1　前处理工艺流程(重锈蚀工件 )浸渍式除锈、除油→浸渍式水洗→浸渍式防锈处理→上挂 (一般锈蚀及油污工件直接从此上 )→喷淋预脱脂→喷淋脱脂→喷淋水洗 ( 1)→喷淋水洗 ( 2 )→喷淋除锈→喷淋水洗( 1)→喷淋水洗 ( 2 )→喷淋表调→喷淋磷化→喷淋水洗 ( 1)→喷淋水洗…     

飞机加油车涂装工艺

飞机加油车涂装工艺南京晨光机器厂（２１０００６）陆兴元国产飞机加油车需要涂装的零部件很多，具有代表性的是油罐等大型部件。我们通过试验选用新型的快干腻子及与之配套的涂装工艺，明显提高了飞机加油车的外观装饰性和防护质量。１腻子及涂料的选用飞机加油车油罐由...     

摩托车油箱涂装前处理工艺

用本工艺处理的各型摩托车内外表面能均匀地附着一层灰色或深灰色、完整、致密、细腻的磷化膜，膜厚为３～５μｍ。１工艺流程白坯油箱的检验→除油污→预脱脂→本脱脂→流动热水洗→流动冷水洗→酸洗→一次流动冷水洗→二次流动冷水洗→表调→流动冷水洗→磷化→流动冷水...     

阴极电泳在空调压缩机涂装生产线上的应用

1　前　言为了提高空调压缩机的表面涂层质量 ,尤其是焊缝及边角处易出现锈斑和涂层破坏问题 ,国外已普遍采用了阴极电泳涂装工艺 ,其具有涂膜质量好、涂料利用率高、适用于大批量的自动化连续生产、无火灾隐患、符合环保要求等优点。我公司为某压缩机有限公司制造的空调压缩机阴极电泳涂装线经过半年多的生产运行证明 ,工艺技术先进、设备配置合理、操作及维护管理简便、涂膜质量好、生产效率高 ,技术指标达到了规定的要求。2　工艺及设备配置2 .1　涂装线工艺 (见表 )表　涂装线工艺工序处理方式 工艺参数时间 /ｓ温度 /℃压力 /ＭＰａ脱…     

"凸背T铁"成形工艺的改进

介绍了"改进凸背T铁成形工艺"的设计原理、工艺设计计算,并通过对比分析及工作实例说明了改进后的工艺特点.该工艺提高了模具的使用寿命.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.