自动化双拼生产在冲压中的应用

在过去几年里,汽车行业异军突起,江铃集团在日益壮大的汽车市场中,也紧随市场需求应时开发新的车型,福特V348新全顺、N350多功能运动型SUV车型等也陆续研发上市,随着车市强劲有力的发展,江铃各品牌车型的销量也屡创历史新高,然而固有的手工生产线要保证现有产量,已经显得越来越力不从心,更不能满足未来几年不断攀升的产量及新...     

汽车车门外板新材料的应用

对于制造业来说．21世纪是新产品、新材料的竞争。在过去几年里，汽车行业异军突起，江铃集团在日益壮大的汽车市场中．也紧随市场开发新的车型。然而，激烈的市场竞争驱使汽车制造商从各方面设法提高其新开发车型的质量。在整个新产品、新车型的开发过程中．由于新材料、新工艺、新设备的运用以及不断提高的产品质量要求，技术人员同时存在某些方面的经验欠缺，势必会出现一些开发阶段未曾考虑的新问题，这些问题关键而棘手．寻找正确有效的解决方案迫在眉睫。本文主要针对新车型N350车门外板出现的板材抗凹性能差的问题．进行分析与解决。     

服装美学史(一)(从美学角度看服装史的发展)

美索不达米亚有关服装史的书籍,仅仅提供了人类所设想和真实存在的过去五千年来零星片断的记载。面对许多瑰丽壮观的考古发现,我们依然对古代文明的高尚趣味、新颖样式和美妙设想惊叹不已。一则由于它们反映了人类进化的惊人进程,二则由于我们的一知半解,所以古代世界就愈显得丰富多彩、引人入胜了。     

论建筑机电工程设备安装项目管理

建筑机电工程设备安装是融合了计算机技术、通信技术、信息技术以及建筑艺术的特点,为人们提供了更舒适、便利、人性化的生活方式,在近年来得到了广泛应用.对于机电设备安装工程,施工项目管理的主要内容包括进度控制、质量管理、安全管理、成本控制等方面.由于项目管理是一项复杂的系统工程,管理部门应积极支持和重视,只有建立完善的管理控制体系,才能做到管理一流、质量一流、效益一流.     

深厚软土河床上大型钢板桩围堰设计与探讨

中山东河水利枢纽工程修建在深厚淤泥质软土上,钢板桩围堰对于该种特殊地质条件有其独特的优越性。对此简析钢板桩围堰的设计、施工和监测情况,通过监测所得结果进行设计优化,并指导后续施工的进行。该工程表明监测工作是保证工程安全、判断险情和优化设计的关键。     

1900mm板坯连铸机扇形段力学性能的有限元分析

本文对板坯连铸机扇形段的力学性能应用三维弹性有限元方法进行了全面的分析研究,对模型设计过程中遇到的问题给予了详细的讨论并提出了建设性的简化措施。针对扇形段在正常矫直工作状态及三种咬入工作状态载荷的不同分布,分别求出扇形段的位移场和应力场,并得出了不同工作状态的强度和刚度。     

汽车灯泡定位盖帽多工位级进模设计

分析了汽车灯泡定位盖帽的工艺特点,阐述了根据这些工艺特点在模具设计中应采取的工艺措施,并确定了排样方案和模具的总体结构。实践证明,模具设计结构可靠,能保证产品质量,并能应用于同类产品的级进模设计。     

Numerical evaluation of uplifting effect for upper structure by grouting

A stratum grouting-soil-structure interaction model which simplified the grouted zone into a series of spherical grout bulbs was established using FLAC^3D program. The hypothetical non-uniform expansion process to reach an assigned volume strain due to soil compression by grouting was achieved by imposing radial velocity on outer mesh nodes of these spheres. This new method avoids the repeated trial calculation needed in the traditional method which applied a fictitious expanding pressure in the grouting element. The deformation and additional internal forces of structure were investigated during each grouting strategy and the influences of various stiffness of grouting proof curtain and bearing capacity of pile tip were discussed simultaneously. The numerical model is proved to be effective to replicate general behavior expected in the field and is capable of modeling the uplifting effect for the surface structure by grouting.     

Ultimate end bearing capacity of rock-socketed pile based on generalized nonlinear unified strength criterion

In order to study the mechanism of bearing behavior at the tip of a pile embedded in rock, the generalized nonlinear unified strength criterion and slip line principle for resolving the differential equation systems which govern the stress field were applied to derive the ultimate end bearing capacity based on some reasonable hypothesis and failure plane model. Both numerical simulation and test results were compared with the theoretic solution. The results show good consistency with each other and verify the validity of the present approach. The depth effect with respective to embedment ratio and other influence factors like geological strength index, intermediate principal stress, overburden factor, and damage on end bearing capacity were discussed in the analytical solution. The results show that the proposed yield criterion can be much better for investigating the ultimate end bearing performance of rock-socketed pile. The end bearing capacity increases with embedment ratio and the increasing degree is influenced intensely by the above parameters. Furthermore, ignoring intermediate stress effect would underestimate the strength properties of the rock material and lead to a very conservative estimation value.