科创中国

采用PFA材料所成型的油封在机床油管中起到密封和显示油液位置的作用,以解决机床油路部分漏油的问题.为确保油封质量合格,运用CAE软件Moldflow模拟了油封塑料熔体在模具模腔中的流动、保压、冷却过程,预测制品可能发生的翘曲、气穴、熔接痕等缺陷,据此对油封模具的结构和注塑工艺参数优化,并介绍外骨架油封批量生产的模具设计及工作过程,提高了一次试模的成功率,加快了模具开发进度,进而缩短产品开发周期,提高企业的配套能力和产品质量.

The current development of precision plastic injection molding machines mainly focuses on how to save material and improve precision, but the two aims contradict each other. For a clamp unit, clamping precision improving depends on the design quality of the stationary platen. Compared with the parametric design of stationary platen, structural scheme design could obtain the optimization model with double objectives and multi-constraints. In this paper, a SE-160 precision plastic injection molding machine with 1600 kN clamping force is selected as the subject in the case study. During the motion of mold closing and opening, the stationary platen of SE-160 is subjected to a cyclic loading, which would cause the fatigue rupture of the tie bars in periodically long term operations. In order to reduce the deflection of the stationary platen, the FEA method is introduced to optimize the structure of the stationary platen. Firstly, an optimal topology model is established by variable density method. Then, structural topology optimizations of the stationary platen are done with the removable material from 50%, 60% to 70%. Secondly, the other two recommended optimization schemes are given and compared with the original structure. The result of performances comparison shows that the scheme II of the platen is the best one. By choosing the best alternative, the volume and the local maximal stress of the platen could be decreased, corresponding to cost-saving material and better mechanical properties. This paper proposes a structural optimization design scheme, which can save the material as well as improve the clamping precision of the precision plastic injection molding machine.

探究了Vectran长丝纱在剑杆小样机上试织平纹织物的主要工艺设计和上机织造情况.研究Vectran长丝纱的可织性,探索利用Vectran长丝纱开发新型产业用纺织品的途径.结果表明其可织性与芳纶类似,主要问题是其织造张力难以均匀控制,且易钩丝,应对长丝纱作前处理并合理控制织造工艺.

利用Moldflow的AMI 2011 Performance模块,对热水壶底座注塑模的2种浇口方案进行了模拟分析.分析比较了2种进胶方案的流动平衡,注射压力,翘曲变形等方面,并通过实际注塑结果进行验证.

The existing research of process capability indices of multiple quality characteristics mainly focuses on nonconforming of process output, the concept development of univariate process capability indices, quality loss function and various comprehensive evaluation methods. The multivariate complexity increases the computation difficulty of multivariate process capability indices(MPCI), which makes them hard to be used in practice. In this paper, a new PCA-based MPCI approach is proposed to assess the production capability of the processes that involve multiple product quality characteristics. This approach first transforms the original quality variables into standardized normal variables. MPCI measures are then provided based on the Taam index. Moreover, the statistical properties of these MPCIs, such as confidence intervals and lower confidence bound, are given to let the practitioners understand the capability indices as random variables instead of deterministic variables. A real manufacturing data set and a synthetic data set are used to demonstrate the effectiveness of the proposed method. An implementation procedure is also provided for quality engineers to apply our MPCI approach in their manufacturing processes. The case studies demonstrate the effectiveness and feasibility of this new kind of MPCI, which is easier to be used in production practice. The proposed research provides a novel approach of MPCI calculation.

主要介绍了徐州香山物流流程设计优化问题,并具体对该企业仓储、运输现状进行分析,提出了具体的优化措施和方案.

在综合比较知识管理成熟度模型的基础上,充分借鉴诸多知识管理成熟度模型的特性,结合我国企业知识管理实践,提出企业知识管理成熟度整合模型,并深入剖析其逻辑结构、成熟等级、关键过程领域以及实施程序,为现代企业有效实施知识管理项目,提升知识管理能力和绩效提供借鉴和帮助.

对外径为Ф10mm碳纤维复合材料管成型工艺及性能进行了研究.结果表明,采用热缩工艺成型的碳纤维复合材料管工艺简单、质量可靠,Ф10mm碳纤维复合材料管件弯曲刚度与不锈钢管相当,弯曲强度为不锈钢的3倍以上,质量仅为不锈钢的50%,尺寸精度满足设计要求.

根据现代物流的发展,提出物流的物品、过程两个基本假设,沿着这两条主线,结合物流系统结构、实体物流表现、物流学科设置,理论联系实际分析了物流系统框架.

介绍了一种适用于在强干扰、关键信号被无用信号淹没的情况下,实现高精度数据采集的系统.系统硬件上采用24位高精度A/D采集模拟信号,采用XILINX公司的FPGA作为主控制器;软件上通过从A/D读取数字化后的信号,再进行高阶FIR滤波,剔除了干扰信号.通过FIR滤波在数据采集系统中的运用,采集系统可以较传统数据系统有更高的采集精度和更强的抗干扰能力.