共查询到20条相似文献,搜索用时 109 毫秒
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注塑成型是最重要的塑料成型方法之一,它的最大优点是可以一次成型结构复杂的制品,应用很广。但注塑制品在成型过程中常会出现各种缺陷,从影响注塑制品质量的几个因素(材料、成型工艺、模具设计、制品设计)着手,分析了注塑制品常见的表观缺陷、产生的原因及其对策。 相似文献
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注塑制品常见的质量缺陷分析 总被引:8,自引:0,他引:8
本文从影响注射成型制品质量的三大因素(塑料材料、注射成型工艺、注射模具)着手,分析常见的注射成型制品的质量缺陷产生的原因和克服缺陷的具体措施。 相似文献
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重点分析了注射成型的工艺和制品质量的关系,通过引入注塑制品成型缺陷领域的专家经验和知识,获取相关设计知识并把它们表示成符合CLIPS语言规范的产生式规则形式,建立了注塑制品缺陷知识库,并采用CLIPS知识推理机完成了注塑制品缺陷的诊断,得到制品缺陷产生的原因以及相应的解决措施。给出的推理实例表明了该系统的实用性。 相似文献
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使用自动电位滴定仪测定轻质石油产品中的溴值,分析速度快,克服了容量法分析石油产品过程中分析时间长,人为影响因素多的原因,分析结果重复性好。对于深色石油产品也可以很好地进行分析,消除了分析深色石油产品的溴值时无法准确判断其终点的缺陷。 相似文献
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介绍了在塑料制品成型加工过程中常见的注塑成型缺陷类型。并简要说明了存在问题的一些调整方法及解决措施。 相似文献
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《Journal of the European Ceramic Society》2023,43(2):486-492
The uniaxial die compaction and sintering is an important industrial production method for metal and ceramic components. While submicron- and nano-sized powders are finding increasing use for making dense materials with finest grain sizes, the uniformity of microstructure, and then, the reliability of the products depend on the heterogeneity in powder packing structure. Here we applied the synchrotron X-ray multiscale-CT to characterize the complex domain structures, i.e., agglomerates, in powder compacts, and revealed how heterogeneous distribution of fine residual pores is formed by the differential sintering of agglomerates by using a submicron alumina powder as a model. A crack-like defect was identified as the largest defect. This defect was formed along the boundary between a plate-shaped agglomerate and its surroundings. A technique was also proposed to visualize the heterogeneous distribution of residual pores by using SEM. These characterization methods will open up new possibilities for the optimization of ceramic processing. 相似文献
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Hongping He Peng Yuan Jiugao Guo Jianxi Zhu Cheng Hu 《Journal of the American Ceramic Society》2005,88(4):1017-1019
The thermal stability of kaolinite and the microstructure of its thermal products strongly depend on random defects ( R 2 ) rather than crystalline defects (HI). Kaolinite with a lower random defect density is more stable than that with higher defect density during dehydroxylation and the derived metakaolinite can be directly transformed into orthorhombic mullite (3/2-mullite). However, for kaolinite with higher random defect density, there is a cubic phase occurring in the transformation from metakaolinite to primary mullite. Primary mullite will be transformed into orthorhombic mullite as temperature increases. AlV is universally present in the metakaolinite and the relative amounts of AlVI , AlV , and AlIV vary with the random defect density of the parent kaolinite. 相似文献
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注塑制品一个普遍存在的缺点是有内应力。内应力的存在对塑件在储存和使用中出现变形和开裂的重要原因,也对影响塑件性能等重要因素。通过对内应力在塑件中存在形式阐述,介绍两个典型的注塑产品按照要求进行后处理的例子,讲述塑件后处理的重要性,以保证塑件后处理所达到的功能要求,旨在了解和掌握去除注塑制品内应力的后处理方法和检查办法。 相似文献