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针对香皂盒套件注塑模组合型腔熔体流动不平衡的问题,利用Moldflow软件进行注塑数值模拟。从充填时间,速度/压力(V/P)切换点压力,注射位置处压力三方面对初始方案进行分析,确定浇注系统优化指标,采用流道平衡分析自动优化方案的流道尺寸进行优化设计。结果表明,优化后的浇注系统,型腔间的充填时间的不平衡率低于5 %,压力不平衡值小于5 MPa,注射位置处压力曲线能够平稳上升,有效改善了熔体流动不平衡。 相似文献
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浇注系统的流动平衡设计是一模异穴注塑模具设计的重点和难点,其设计多依据工程人员经验,易造成模具整体设计效率的低下,本文以某型充电宝(外观自主开发)塑料外壳为例,设计了充电宝塑料外壳组成的一模异穴布局的浇注系统,基于CAE分析技术,从浇注系统的充填时间、V/P切换点压力、注射位置处压力三个关键评价指标对初始浇注系统设计方案进行分析;以浇注系统中的各级流道的截面尺寸作为优化设计目标,基于Moldflow软件中的流道平衡分析技术对各级流道的尺寸进行迭代优化计算。优化后的浇注系统有效改善了熔体的充填不平衡。优化结果表明:一模异穴型腔充填的时间不平衡率3.51%,压力不平衡值为3.86 MPa,满足充填时间的不平衡率低于5%,压力不平衡值小于5 MPa的要求。通过实际的注塑生产验证,获得的注塑产品质量合格,可为一模异穴结构的模具浇注系统设计提供借鉴。 相似文献
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对注射成型模具中胶料沿流道压力损失(简称胶料压力损失)进行研究。结果表明:胶料压力损失与胶料注射速度、胶料温度、流道长度、流道截面参数及胶料流变参数有关;在特定工艺参数(注射压力120 MPa、注射时间60 s、塑化温度70℃、模具温度160℃、注胶量220 mL)下,每经过10 mm流道长度,胶料压力损失为0.649 MPa;注射过程中胶料压力损失实测值小于理论计算值,稳定后的胶料压力损失误差在8 MPa内;胶料压力损失对胶料注射时间、塑化温度、模具温度较为敏感,注射时间越短,胶料压力损失越大,塑化温度、模具温度越高,胶料压力损失越小。 相似文献
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基于Moldflow软件的型腔各异模具流动平衡优化 总被引:3,自引:1,他引:2
采用Moldflow6.1的填充分析模块和流道平衡模块,分析型腔各异模具的不平衡流动。发现优化流道截面尺寸,流动不平衡率仅从28.16%降为20.88%,而同时调整型腔布局和优化流道截面尺寸,能将流动不平衡率从28.16%降为1.16%。结果表明,当熔体流动不平衡率较大时,应首先考虑调整型腔布局,再结合调整流道截面尺寸、浇口等因素使之达到流动平衡;型腔布局对熔体的平衡流动起着重要作用。 相似文献
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针对拥有组合式型腔的叠层注塑模,设计了一套初始浇注系统方案,并通过模流分析软件Moldflow对其进行熔体填充分析,结果出现填充时间和压力不均的问题。进行流道平衡分析后的流道虽然满足收敛要求,但在实际生产中不合理,所以通过修改流道和浇口再次进行流道平衡分析。最终结果的填充时间、压力和流道尺寸均满足要求,说明该叠层注塑模的流道平衡优化设计可行。 相似文献
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以手机前盖及前饰板两个非等体件共模结构为分析实例,阐述在不同体积型腔的模具流道设计中,利用MPI软件对不同流道的设计进行对比分析。主要对比分析了三种典型的浇注方式对浇注时间、转换压力及锁模力三个要素的影响,再根据产品的需求选择合适的流道设计,最后利用分析出的两腔填充时间比值确定产品流道截面的尺寸。优化了分流道,使塑件的填充达到了流动平衡,尽可能减小了塑件的缺陷。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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D. G. Gordeev L. F. Gudarenko M. V. Zhernokletov V. G. Kudel’kin M. A. Mochalov 《Combustion, Explosion, and Shock Waves》2008,44(2):177-189
A semi-empirical equation of state for metals is described. Its capabilities are demonstrated by the example of the equation
of state for aluminum. New experimental data are presented on the location of the isentrope of aluminum for unloading from
the state at p = 229.71 GPa on the shock adiabat to an aerogel (SiO2) of density 0.08 g/cm3.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 2, pp. 61–75, March–April, 2008. 相似文献
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Jorge Marcelo Romero Soledad Bustillo Hugo Enrique Ramirez Maisuls Nelly Lidia Jorge Manuel Eduardo Gómez Vara Eduardo Alberto Castro Alicia H. Jubert 《International journal of molecular sciences》2007,8(7):688-694
A thermochemical rather simple experimental technique is applied to determine the enthalpy of formation of Diperoxide of ciclohexanone. The study is complemented with suitable theoretical calculations at the semiempirical and ab initio levels. A particular satisfactory agreement between both ways is found for the ab initio calculation at the 6–311G basis This set level. Some possible extensions of the present procedure are pointed out. 相似文献
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A perturbation viscometer is a differential capillary viscometer that measures the logarithmic viscosity gradient of the viscosity-composition curve for gas mixtures. Measurements are made at different gas mixture compositions. Integration of the logarithmic viscosity gradients measured over the full composition range gives the mixture viscosity relative to the viscosity of one of the pure components of the gas mixture. This method is attractive because, for measurements of equal precision, integration of the gradients is potentially an order of magnitude more precise than measurement of the viscosities directly. It can also work at high and low temperatures and perhaps high pressures.The perturbation viscometer has been used to make measurements on ideal gas mixtures at ambient and elevated temperatures. The situation is more complicated when the gas mixtures are non-ideal. Extra effects due to density differences, molar volume change on mixing and differential thermal expansion may be measured in addition to the desired viscosity change producing systematic errors in the results. Thus, a more sophisticated apparatus is required. The standard perturbation viscometer has been modified to separate out the extra effects to permit measurement of the true change in viscosity. In addition, the theoretical operation of the modified apparatus has been revised to account for the design changes to permit calculation of the viscosity-composition profiles from the results.The apparatus has been tested using helium-HFC-125 mixtures and two new viscosity-composition profiles are presented for these mixtures at 23 and . Internal consistency tests have been used to confirm that the data produced are of high quality with an estimated uncertainty in the viscosity ratio data at of 0.9% and at of 1.5%. 相似文献
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醋酸纤维素取代基分布与性质的关系 总被引:9,自引:0,他引:9
分析了以吡啶为溶剂的醋酸纤维素的13C-NMR核磁共振谱,得出了三种不同位置羟基的取代度。结合X—射线和DSC分析,初步说明具有相同取代度但未经水解和经过水解的醋酸纤维素(CA) 性质上的差异是由于三个羟基上的取代度分布不同及消晶程度差异所致。 相似文献