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介绍了我国模具工业结构现状及敏捷制造的基本思想,论述了应用敏捷制造建立模具行业的动态联盟可缩短模具设计和制造周期,提高我国模具工业的竞争力. 相似文献
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通过探讨无机粘接的原理及其在模具结构上的应用,在降低制造要求和成本的前提下,解决了复杂模具加工和装配中精度低的难题,提高了模具的使用寿命 相似文献
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针对先进制造系统的需求,参考STEP标准,进行了支持STEP标准的模具产品集成建模的研究。建立了模具产品模型的总体结构,具体分析了其核心部件-模具产品集成信息模型(DPIIM),并研究了模具产品模型中应用协议的开发过程,为模具产品开发提供了基于统一标准的参考模型。 相似文献
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本文主要介绍了CAM技术概念和组成,讨论了CAM技术在模具制造中的应用,证明了CAM技术在机械制造中发挥了重要的作用,从根本上改变了模具制造的现状,促进了模具产晶性能的提高,使模具制造进人了一个全新的发展阶段,为制造业的发展提供了完善的技术支持。 相似文献
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冲压模具是冲压生产必不可少的工艺装备,是技术密集型产品。结合与冲压模具有关的模具制造技术和模具材料,介绍冲压模具的发展趋势。 相似文献
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目的 开发一套基于NX平台的自动化级进模工艺设计系统,提升工艺设计的自动化水平.方法 基于工艺结构一体化的思想,采用自动化特征识别、工具体记忆特征和折弯中性层展开等技术,实现自动化的工艺设计.结果 在NX7.5平台上,以格力空调外机右侧板为例进行测试,完成工艺设计大约耗时10 min左右,生成的工艺信息可以用于后续的模板模架生成、冲头调用和标准件排配等模块,实现了自动化的结构设计.结论 基于特征识别等技术研发的自动化工艺设计系统,显著提高了设计效率,缩短了模具设计周期. 相似文献
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This paper describes a decomposition algorithm to estimate the performance of a call center with two types of customers and two server categories. In this system specialized servers can process only one customer type, while flexible servers handle both types. The algorithm divides the systems state space into regions, and simple approximate models find the conditional system performance within each region. While the procedure described here is tailored for a system with a priority queue discipline and two customer classes, it can be adapted for systems with FCFS queue disciplines and for systems with more than two customer types. Performance measures generated by the procedure are sufficiently accurate for many service system design decisions, such as setting telephone call center staffing levels and long-term capacity planning. The procedure is also extremely fast, and its computational requirements do not grow with system congestion. Numerical tests demonstrate that its running time is significantly lower than traditional numerical methods for generating approximations. As an example of its use, we employ the procedure to demonstrate the benefits of server flexibility in a particular telephone call center.The author thanks Gregory Dobson, who participated in the initial consulting project and problem formulation, as well as Paul Schweitzer, Harry Groenevelt, and two anonymous referees for their helpful suggestions. 相似文献
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为比较联络中心与呼叫中心因通信渠道数量、种类的不同所导致的人力效能的差异,利用Extendsim仿真软件,分别建立单渠道、两渠道和三渠道联络中心的仿真模型。以客户平均等待时间、座席占用率和服务总人数三个指标作为反映人力效能的评价指标,通过改变座席人数来对比三种模型的三个评价指标的差异。结果表明,与单渠道呼叫中心相比,在相同的任务强度下,多渠道联络中心(尤其是三渠道联络中心)的人力需求更少,当座席人数相同时,三渠道联络中心的客户平均等待时间平均减少46.16%,座席占用率平均降低6.95%,服务总人数平均增加5.58%。通过合理地增加改善通信渠道的数量、种类,多渠道联络中心能够更好地发挥人力效能,降低人力成本,提高服务水平。 相似文献
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目的坯料的误差是影响冷拔成形精度的随机误差,研究在实际冷拔生产中坯料误差影响的控制方法。方法以冷拔45钢的传动轴为例,利用ANSYS对冷拔过程进行模拟仿真,分析坯料直径误差对冷拔成形精度的影响。结果即使在优化的冷拔预处理工艺和优化的模具结构参数等条件下,坯料的误差对冷拔精度影响较大,难以达到IT7以上的冷拔精度。结论针对这一问题,提出了使用可变径模具来控制冷拔成形尺寸,通过模拟分析比较,证明了调节冷拔模具的直径可以控制冷拔成形尺寸,从而提高冷拔成形精度。 相似文献
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固液界面与单晶连铸表面质量 总被引:2,自引:0,他引:2
本文研究固液界面对单晶连铸表面质量的影响,结果表明,形成中心向液体中凸出形状的固液界面,且保证铸锭表面在离开铸型之后自由凝固是获得高的表面质量的必要条件。 相似文献
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Kim G Jeong M Lim H Lee J Choi KB Do LM 《Journal of nanoscience and nanotechnology》2012,12(7):5336-5341
This paper shows a novel nano-imprint method with a polydimethylsiloxane (PDMS) replica mold that was bonded on a cylindrically inflated polycarbonate (PC) film via a low air pressure. The PDMS mold, which was deformed in terms of its cylindrical shape, made a line contact with a substrate from the center region and the contact region, then expanded gradually to the outside of the substrate when the contact force increased. This contact procedure squeezed the resin that was dropped on the substrate from the center to the outside, which prevented the trapping of air bubbles while the cavities were filled with the patterns on the PDMS mold. The main characteristic of the proposed process was that the nano-imprint can be realized under a low pressure, compared to conventional processes. We will show the system that was implemented under the proposed process concept and the patterns that were transferred in an ultraviolet curable resin under pressure conditions of less than 5 kPa. 相似文献
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We consider a multi-period staffing problem in a single-shift call center. The call center handles inbound calls, as well as some alternative back-office jobs. The call arrival process is assumed to follow a doubly non-stationary stochastic process with a random mean arrival rate. The inbound calls have to be handled as quickly as possible, while the back-office jobs, such as answering emails, may be delayed to some extent. The staffing problem is modeled as a generalized newsboy-type model under an expected cost criterion. Two different solution approaches are considered. First, by discretization of the underlying probability distribution, we explicitly formulate the expected cost newsboy-type formulation as a stochastic program. Second, we develop a robust programming formulation. The characteristics of the two methods and the associated optimal solutions are illustrated through a numerical study based on real-life data. In particular we focus on the numerical tractability of each formulation. We also show that the alternative workload of back-office jobs offers an interesting flexibility allowing to decrease the total operating cost of the call center. 相似文献
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简要介绍了Web Service的有关理论,对模具制造遗传优化调度的Web Service体系结构进行了描述,在此基础上,给出了基于Web Service的模具制造遗传优化调度系统各部分的设计和说明,并通过实例验证了模具制造调度系统的可行性. 相似文献
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为了使浇注塑料黏结炸药(PBX)具有均匀的固化温度场,采用COMSOL Multiphysics软件和Fourier数学模型,分别模拟研究了模具尺寸、烘箱与PBX间的温差、PBX固化速率等因素对PBX温度场分布的影响。结果表明:药浆温度低于烘箱温度时,浇注PBX内的温度场呈现由外向里递减的趋势。60 mm×240 mm、100 mm×240 mm、200 mm×240 mm和200 mm×1 000 mm,壁厚都为5 mm的模具,从25℃升至60℃的过程中,模具边缘和中心点的最大温差可分别达到3.22、6.66、10.49℃和13.08℃。200 mm×1 000 mm,壁厚为5 mm的模具分别从0、25、40、50℃升至60℃时,模具边缘和中心点的最大温差可分别达到17.56、13.08、7.02℃和3.36℃。药浆温度与烘箱温度相同时,模具边缘温度最小,中心温度最高,此时影响温度场梯度的主要因素为药浆固化速率的大小。当药浆和烘箱间存在温差,可通过减小模具尺寸、降低浇注PBX内的温度梯度,且浇注PBX的固化尽量采取药浆与烘箱温度一致的固化工艺,此时选择固化速率较小的药浆可实现PBX内的温度基本一致。 相似文献