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前言随着塑料制品加工业的飞速发展,对生产塑料制品的实用配方技术提出了一定的需求,由于目前较多的小型塑料制品加工企业可能是转行而来,加之塑料制品的实用配方技术资料相对较少,给从事塑料制品加工的人员带来了一定的难度,并有可能会造成经济损失。 相似文献
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根据注吹成型机械的特点,设计药用中空容器的外形,为吹塑模具的形体设计提供原始依据。在原料品种确定情况下,阐定容器成型工艺的设计原则。 相似文献
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中国包协塑料包装委员会中空专业组(塑料中空行业经济技术协作组)成立于1984年,行业组成立时,成员厂为56个,到1990年发展到61个,当时据不完全统计,中空制品产量为34300吨,拥有塑料吹塑成型机670台/套,其中由意大利,日本,西德引进设备数百套。行业组发展至今,已经历了十几个年头,生产规模不断壮大,不断从国外引进新的技术,新的设备,采用现代化管理方法,使我行业逐步缩短与世界先进国家同行业之间的差距。近几年来,在激烈的市场经济竞争冲击下,一些原骨干成员企业由于种种原因出现了亏损,行业组经济技术指标完成值有所下… 相似文献
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Song Wang Akitake Makinouchi 《International journal for numerical methods in engineering》2000,48(4):501-521
In this paper, the efficiency and accuracy of contact search algorithms for the blow molding simulation were discussed. In order to increase the efficiency of the contact search, we proposed and implemented three kinds of global search algorithms and compared them with two existing methods in terms of both formulation and CPU time. The proposed sorted moving box method was finally proved to be the most efficient one, without loss of stability. To increase the accuracy, a contact–tolerance–adjustable local search algorithm was also proposed. Successful simulation of the stretch blow molding process was given as an example. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
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Roger E. Khayat Paul Raducanu 《International journal for numerical methods in engineering》1998,43(1):151-174
We examine the three-dimensional potential flow of a fluid (air) inside a cavity as it is induced by the advancement of an isotropic homogeneous membrane (parison) of general shape. This problem is of direct relevance to the processes of blow molding and thermoforming whereby air is evacuated through a number of vents of various sizes that are optimally positioned on the surface of the mold. The membrane material is assumed to obey the Mooney–Rivlin constitutive model, and the resulting deformation field is obtained using a Galerkin based finite-element method. The flow field in the domain bounded by the inflating membrane and the cavity (mold) is obtained using the boundary-element method. The accuracies of the original finite- and boundary-element codes are assessed separately against existing numerical results and analytical solution. The coupled finite/boundary element formulation is used to examine the air flow inside a rectangular mold with an insert and through a number of vents of various sizes at each pressure step of inflation. The accuracy of the coupled method is assessed on the basis of conservation of mass of air flow. © 1998 John Wiley & Sons, Ltd. 相似文献
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快速气压胀形是一种源自超塑性气压胀形的新成形技术,为获得AZ80镁合金板材的快速气压胀形成形性能,以挤压-冷轧加工的AZ80镁合金板材为研究对象,采用半球件自由胀形实验研究了1.0 mm厚板材在250~400℃和0.4~1.6 MPa下的快速气压胀形能力,分析了半球件和盒形件的壁厚分布规律,并对快速气压胀形过程的断裂模式进行了研究.研究结果表明,AZ80镁合金板材在350℃下具有良好的快速气压胀形能力,在350℃、0.8 MPa下的胀形高度可达38 mm,高径比达到0.95,并得到胀破高度、胀形高度与胀形时间之间的关系.在此基础上,进行了1.2 mm厚板材的盒形件快速气压胀形实验,得到高20 mm的轮廓清晰、表面质量良好的胀形件. 相似文献
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The superplastic blow forming of a Ti–6Al–4V sheet into a cylindrical cup has been numerically analysed based on the actual forming process using ABAQUS. A detailed element type study has been performed to eliminate the element dependency in the finite element analysis. The accuracy and reliability of the proposed finite element model has been validated in comparison with experimental data. The validation proves that, there is a good agreement between the simulation and the experiment. In addition, the best prediction of the thickness distribution can be obtained using the continuum element. Furthermore, the effects of major factors such as friction coefficient and the strain rate sensitivity index upon the optimum forming pressure-time and thickness distribution of the component have been studied systematically using the proposed finite element model. 相似文献
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