共查询到20条相似文献，搜索用时 78 毫秒
1.
文章分析了插件端子成形的工艺特点，介绍了冲压该零件的工位排样设计和模具结构设计要点，模具结构中主要工作机构的设计要点，以及凸模、凹模等主要零件的加工工艺。 相似文献
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数控编程广泛应用于航空、汽车、轻工、模具制造等行业的机加工领域,并取得了丰硕成果。在此、我们采用UG软件对牙签筒上盖面壳凸模、凹模进行三维造型和数控加工程序编制,详细介绍了牙签筒上盖面壳凸、凹模的加工工艺。 相似文献
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冲压工艺以金属板材为加工对象,广泛应用于汽车、电器、仪表、机床及五金行业.汽车的工业化生产带动了冲压技术的全面发展.近年来,随着与高新技术的结合,冲压技术有了很大的进步.本文针对某汽车厂生产的汽车车架第一横梁后板,分析了其冲压成形工艺,确定使用落料模和弯曲模(省略)两套模具.由于横梁结构的复杂性和尺寸因素,考虑到设计者的实际水平,对原横梁做了适当的简化.在落料工序中,主要计算了其冲裁间隙、冲裁模刃口尺寸、冲压力等工艺参数,并做了简单分析.在弯曲工序中,主要计算了弯曲件展开长度、弯曲力、凸、凹模间隙以及模具工作部位尺寸.通过CAD制图,画出了落料模和弯曲模的凸、凹模简图. 相似文献
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数控加工刀具运动轨迹是确定数控加工工艺的重要环节,直接影响零件的加工质量及加工成本。为此根据实际产品的形状特征及技术要求,从刀具选择、刀路路径等方面对凹模加工工艺方法进行分析研究,提出了针对凹模曲面及其相似形状特征的模具表面的加工方法。 相似文献
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通过重型汽车轮辐的工艺性分析,在冲孔模设计、三维造型的基础上,对重型汽车轮辐的冲孔模的凸、凹模进行静力学分析,通过ANSYS软件对凸、凹模材料校核、受力分析,从而对模具进行优化,提高模具的使用寿命。 相似文献
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精密硬质合金模具是一种昂贵的精密工具，对它的保养和重新刃磨应给予高度重视．当凸、凹模刃口使用到一定时间后，就应该立即对凸、凹模刃口进行刃磨．采用合理的刃磨方法，可提高硬质合金模具的质量和使用寿命，降低成本． 相似文献
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本文运用有限元分析软件 ANSYS5 . 7模拟计算间隙配合与过盈配合两种不同模具结构凹模实际工况下所受的应力 ,得到凹模表面应力分布云图。结果表明 ,模具间隙配合结构使凹模表面应力分布极不均匀 ,应力集中现象明显 ,使凹模出现疲劳裂纹治造成早期失效 ;过盈配合结构使凹模表面应力大幅度下降 ,应力分布均匀 ,达到了优化模具结构、提高模具寿命的目的 相似文献
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林涵 《福建工程学院学报》2008,6(6)
为解决多工位级进模中变薄拉深和整形工序存在包紧力大、脱模困难的问题,研究设计了浮动式凹模的新型模具结构。分析了铜壳拉深件冲压成形的工艺特性,阐述了铜壳多工位级进模的总体结构设计及工作原理。投产检验证明：该模具结构可实现顺利脱模,保证产品表面质量和尺寸精度。 相似文献
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冲裁模上凸、凹模之间的间隙是影响制件质量的主要因素,然而要保持冲压生产时凸、凹模间隙的均匀,模具的设计、选材、加工和装配各个环节都至关重要。笔者在深入分析了冲压工件时出现单边毛刺的可能情况及原因,研究了凸、凹模间隙均匀的控制方法,并提出了模具使用后间隙变化的调整、修配措施,对冲压生产具有实际指导意义。 相似文献
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本文针对空心圆管单向缩口扩口零件传统加工工艺的缺陷,利用复合成形法,使空心圆管单向缩口扩口模芯和缩口扩口凹模采用组合方法,从而改进了加工工艺过程、更进一步地保证了产品质量,提高了经济效益, 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献