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在冲压加工过程中,模具构件之间的机械运动贯穿始终。各种冲压工艺的实现都有其基本运动机理,这种运动是与模具密切相关的,各种模具的结构设计和力学设计最终都是为了满足其能够实现特定运动的要求。设计的模具能否严格完成实现冲压工艺所需的运动,直接影响到冲压件的品质,所以在模具设计中应对机械运动进行控制。同时为了达到产品形状尺寸的要求,不能够局限于各种工艺基本运动模式中,而应不断发展和创新,在模具设计中对机械运动灵活运用。 相似文献
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在冲压过程中，机械运动贯穿始终．各种冲压工艺的实现都有其基本运动机理，这种成形运动是与模具密切相关的，各种模具的结构设计和力学设计最终都是为了满足其能够实现特定运动的要求．设计的模具能否严格完成实现冲压工艺所需的运动，直接影响到冲压件的品质，所以在模具设计中应对机械运动进行控制．同时为了达到产品形状尺寸的要求，不能拘泥或局限于各种工艺基本运动模式中，而应不断发展和创新，在模具设计中灵活运用机械运动． 相似文献
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针对近似对称的两个窄长钣金零件尺寸大、精度要求高、定位凸点和翻孔较复杂的特点，提出了同凹模异凸模的新型的模具结构。首先，分析了冲压成形工艺，根据制件结构特点合理安排工序顺序。然后，对模具总体结构进行设计；设计中将2个近似对称的工件并排置于模具内，同时上、下料；加宽了模具前后宽度，增强了稳定性；采用弹簧上置的弹性卸料结构，实现平稳可靠卸料。利用定位板对冲压件进行准确定位。结果表明，该模具结构保证了模具生产的稳定性和可靠性，对多件共冲模具的设计有一定的参考价值。 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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“冲压模具设计”学习领域课程教学改革探讨 总被引：1，自引：0，他引：1
提出了基于工作过程导向的高职模具专业"冲压模具设计"学习领域课程教学改革的思路。以冲压件为载体,按照模具类型构建了该课程的学习情境,设计了实例引导,任务驱动,学练结合,情境育人的教学模式,制定了强化能力、过程考核办法。 相似文献
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通过对R托的孔、圆弧面、弯曲面、加强筋等结构的冲压工艺性分析,确定了R托的冲压工艺方案,进行了R托的落料模、冲孔模、弯曲翻边压筋模的模具设计. 相似文献
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针对形状近似的多件引线插脚分别冲压成形时带来的效率低、成本高的问题,提出了有奈件的共用模设计方法。首先对共用模的前提条件作了界定,然后分析了共用级进模具的设计要点,并对该类型多工位级进模设计的排样、模具结构、主要零部件的设计与制造方法作了阐述。结果表明,这种类型的模具可以达到提高生产效率、节约材料和成本的效果。 相似文献
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分析了《冲压模具设计与制造》项目课程的设置必要性和可行性,根据项目课程的主要特点提出了实施教学的具体步骤和措施,对课程中项目的设计思想及实施过程中应注重的问题作了探讨,并指出保证项目课程教学质量的关键因素。 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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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
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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Anton Franks 《English in Education》1999,33(2):39-49
This paper looks at the way drama works to bring a model of an arts curriculum into reality. He also shows how drama is valuable when discussed as a separate, autonomous subject in the school curriculum as opposed to one subsumed within English. He argues for a view of the arts and gives an example of a sequence of work in an English GCSE class based around Arthur Miller's play View from the Bridge. From this he draws out several strands about the relationship of the drama curriculum to the individual students and teachers, the school, and to culture. He also emphasises the primacy of performance in drama education. 相似文献