共查询到20条相似文献,搜索用时 46 毫秒
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某产品零件在氰化镀锌溶液中电沉积锌出槽后,锌镀层发暗,有黑斑,经硝酸溶液浸渍出光,锌镀层严重发暗,且有暗色斑点,无论是硝酸出光,还是低铬酸出光,表面均呈黑褐色,零件孔眼部位呈亮白色,钝化后严重发雾,钝化膜无光泽且发喑。仔细观察电镀过程,发现锌阳极板阳极区内出现微量丝状黄色絮状物,阳极溶解异常,经过判断黄色絮状物是Cd与镀液中的S反应生成硫化镉黄色沉淀。原来操作人员误将镉板当做锌阳极使用,造成本次故障的发生。 相似文献
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我厂滚挂镀锌都是采用DE型锌酸盐镀锌工艺 ,其中添加剂DE与光亮剂一直使用同一厂家的产品。工作时控制锌碱比例为1∶(8~ 10 ) ,满负荷生产时 ,一般每月底用锌酸盐除杂剂处理一次 ,镀锌槽曾出现过两次故障。1 故障一(1)情况 挂镀和滚镀先后出现镀层粗糙、灰暗的现象 ,镀液分散能力和深镀能力差 ,生产难以正常进行。(2 )分析 故障产生的原因 :①锌碱比例失调 ,锌高碱低 ;②添加剂、光亮剂不足 ;③温度太高 ;④镀液杂质含量高。(3)排除过程 通过逐一检查、分析、调整 ,最后发现温度是引起这次故障的主要原因。锌酸盐镀锌控制最佳温度… 相似文献
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多色打印中基于光谱的油墨选择——最佳油墨选择 总被引:4,自引:4,他引:0
描述了从给定油墨库中选择出一组八色油墨,建立最小化同色异谱的八色光谱打印模型的油墨选择算法.对于一个含有n种油墨的油墨库,这里有Cn8种油墨组合,当n很大时,油墨组合的数量就成了几何数字.有些明显不可能的油墨组合,通过解析法可以去除.首先,使用向量相关性分析法来去除没有可行性的组合.然后,用连续调相似评估每一备选油墨组的色度和光谱精确度.选择备选油墨组中对应有光谱精确度最高的一组油墨,定为八色打印过程的最佳油墨组以获取最小同色异谱的色彩复制. 相似文献
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Satisfying customer expectations is of paramount importance in today's markets. A customer expects to receive a product that meets as best as possible his/her expectations. To satisfy diversified requirements companies may focus on product families. For a specific customer the company has to select within a product family what will make a valid product. Then, in a just-in-time environment, the suppliers may have to provide the exact subassemblies corresponding to each product in a predefined time. This integration takes place by designing modules for the supplier. This paper proposes to extract customers’ behaviour patterns, in terms of the components required, using data-mining and entropy maximisation when selecting modules to be manufactured. Different methods for selection of modules are proposed. Computational tests are performed to evaluate performance of the selection methods with respect to the specified assembly time/resource level. 相似文献
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This paper presents a statistical method for selecting the best inspector for visual inspection having the highest defect-finding ability among k(≥2) prospective inspectors. A sample containing known number of defects are submitted to each of k prospective inspectors. As the sample size is increased, sampling variation decreases so that we have a better chance of selecting the truly best inspector, but at the same time the cost of sampling is also increased, The problem is how to determine the sample size required for selecting the best inspector with specified probability P*. This problem is formulated from the indifference zone point of view with an application of the loss function which takes into consideration the opportunity cost of making a wrong selection and the cost of sampling. Minimax solution is obtained under the restriction that the best inspector is to be selected with the specified probability P*. The selection procedure is applied to the visual inspection of car body painting. 相似文献
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工艺冷却用蒸发器的选择 总被引:1,自引:0,他引:1
在设计工艺冷却过程中,充分了解不同形式的工艺冷却用蒸发器,才能选择最适合工艺条件的换热器。本文对制冷工艺用的3种常用蒸发器的使用范围、结构设计以及使用中的注意事项等进行归纳总结,为制冷工艺设计人员、化工工艺设计人员等提供一些参考。 相似文献
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Finding an application for a given (not necessarily new) material is an elusive problem. Methods for material selection to fill a given application are now well developed. But the inverse problem – that of finding applications for a new material – has no such established methodology. The article discusses some general approaches to the problem and demonstrates recent progress in implementing them. 相似文献
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为了对食品包装方法选择问题进行分析,运用一种定量分析法建立包装方法选择模型.运用模型结合具体的实例进行方法选择的计算,结果证明了该方法的有效性. 相似文献
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为了准确地测量记录各种被测信号,应当正确地选用振子的固有频率的阻尼,适当地选取被测信号大大小,保持信号源内阻Ri与振子的内阻rg相匹配,同时要正确地调整光点位置,以减小圆弧误差。 相似文献
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Materials Selection for Semisolid Processing 总被引:2,自引:0,他引:2
The mechanical behavior of alloys in the semisolid state is very sensitive to the volume fraction of solid. In this paper, a simple criterion for processability in the semisolid range is introduced, based on the sensitivity of the volume fraction of solid with respect to minor temperature variations. In addition it is proposed that the processability in the semisolid state can be enhanced using microsegregated material. 相似文献