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基于CAE分析的PP—R管件熔接痕消除方法 总被引:3,自引:0,他引:3
针对PP-R管件生产中易产生熔接痕的问题,本文通过理论分析和计算,认为模具浇注系统设计不当是产生熔接痕的主要原因;进而应用CAE软件进行分析,通过调整浇口位置,对熔接痕的长度进行优化,使其减少到最小,结果得到实践验证。该方法为提高PP-R管件模具的质量提供了可靠的技术保证。 相似文献
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诸如空调扫风百叶此类板条状注塑产品,在常规成型中多点进胶时不可避免的会产生熔接痕缺陷,影响外观质量和机械强度。通过建立分析模型,应用Moldflow软件对常规成型过程进行模拟,对熔接痕缺陷产生的原因进行了分析;同时为了改善熔接痕,提出了采用时序进胶控制技术,并通过Moldflow对比分析了采用该技术前后熔接痕、锁模力、注射压力的状态。结果表明,采用时序进胶控制技术控制各浇口处熔胶逐步推进,不仅有效地消除了熔接痕,而且改善了成型条件。 相似文献
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论述了熔接痕的形成原因,分析了熔接痕的微观结构,介绍了通过改善加工方法增强熔接痕强度的措施,指出了增强熔接痕强度研究的开发方向、技术动态和发展趋势。 相似文献
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利用粉状活性炭为吸附剂,处理头孢菌素C生产过程中的废弃液,实现了去乙酰头孢菌素C(DCPC)和头孢菌素C(CPC)及其他杂质的有效分离.以乙醇-水和异丙醇-水体系作为洗脱剂,得到纯度80%的DCPC溶液.乙醇-水体系收率可达75%,异丙醇-水体系收率可达80%.实验表明,15%乙醇-水和15%异丙醇-水体系分离效果较差;10%乙醇-水和10%异丙醇-水体系洗脱力较弱;12%~13%乙醇-水和12%~13%异丙醇-水体系的洗脱和分离效果较好;13%异丙醇-水体系优于13%乙醇-水体系. 相似文献
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Vratislav Bednarik Jaroslav Melar Milan Vondruska Roman Slavik 《Journal of Inorganic and Organometallic Polymers and Materials》2011,21(1):9-14
The polycondensation reaction between silicate and hydroxoaluminate in alkaline aqueous solution has been experimentally studied.
The time required for the solution to transform to a gel was measured to determine the reaction rate. The addition of alkali
hydroxide to the silicate solution was found to strongly accelerate the subsequent reaction of silicate with hydroxoaluminate.
The results indicate that the acceleration was caused by depolymerisation of the oligosilicates contained in the water glass,
which was used as the source of soluble silicates. The course of oligosilicate depolymerisation in aqueous alkaline solution
was experimentally observed by measuring the electrical conductivity of the solution. 相似文献
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Patrice Rivard Marc-André Bérubé Jean-Pierre Ollivier 《Cement and Concrete Research》2003,33(6):927-929
Experience has shown that the pore solution alkalinity of resaturated concrete was lower than expected. Laboratory-concrete specimens were made with reactive aggregates, stored over water at 38 °C, and then broken into two pieces. The pore solution of half-specimens was extracted by high-pressure squeezing. The other half-specimens were dried at ambient air and rewetted in humid air to their initial weight. The pore solution was then extracted and compared with the composition results of the first extraction. The results obtained from this investigation confirmed that a certain part of the alkali ions in pore solution that had become fixed by drying are not subsequently extracted after rewetting. The alkali concentration [Na+K] was reduced from 34% to 61% by the drying and rewetting treatments. 相似文献
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用JF99A粉体接触角测量仪测定了水溶性阳离子聚合物NCP溶液和部分水解聚丙烯酰胺HPAM溶液在粉体钙质蒙脱土上的润湿性. 实验结果表明NCP溶液在0~1 g/L浓度范围内蒙脱土表面的润湿接触角比水在蒙脱土表面的润湿接触角小,并且比浓度相当的HPAM溶液在蒙脱土表面的润湿接触角要小得多;相同浓度NCP和HPAM溶液中达到吸附平衡的蒙脱土干燥过筛处理后的样品对水的润湿接触角也是前者小于后者,其差别比各自溶液在蒙脱土上的润湿性的差别更大,即经NCP处理后的蒙脱土对水的润湿性明显变好,而经HPAM处理后的蒙脱土对水的润湿性变差. 相似文献