焊接新技术在汽车制造业中的应用及发展趋势

汽车制造中焊接技术应用广泛,随着我国汽车制造业的迅猛发展及焊接在汽车制造业所占据的重要地位,对汽车焊接技术提出了更高的要求。面对入世的冲击、技术的挑战及我国取消对汽车的非关税措施带来的冲击,本文旨在探讨焊接新技术的推广应用及发展趋势,以利于我国汽车工业的品牌提升,增强其市场竞争力。     

零件设计中形位公差的正确选用

对零件设计中的形位公差项目的确定和形位公差值的合理确定进行了探讨,主要论述了综合公差和单项公差的关系、公差项目和公差值的确定方法及应注意的相关问题,既满足设计要求又降低生产成本.     

4R机器人的运动分析及仿真

通过D-H法建立4R机器人的运动方程,得到一组运动学正解公式,并利用MATLAB软件把正解在整个运动空间搜索,得到机器人的运动轨迹,完成其位姿空间的仿真.     

Dielectric,Optical and Thermal Properties of LDPE/ZnO Hybrid Film

The hybrid films of low-density polyethylene(LDPE) embedded with zinc oxide(Zn O) particles were prepared by melt-blending process. X-ray diffraction(XRD) results illustrate that Zn O particles are distributed in the LDPE matrix and FTIR results show that no chemical bonds form between Zn O particles and LDPE matrix. The measurements of the dielectric properties of the hybrid films show that the dielectric constant of the composites reinforces and dielectric loss increases with increasing Zn O weight fraction. Moreover, the thermal properties of the LDPE/Zn O hybrid films are improved and the results of optical properties studied by ultraviolet-visible(UV-Vis) spectrometer show that the inclusion of Zn O particles can improve the anti-UV properties of the films. The improvements of the dielectric, optical and thermal properties demonstrate that the hybrid film will be a promising material in the food package and engineering fields.