STUDY ON POLYPYRROLE-VISCOSE CONDUCTING FIBER

The conductivity of Polypyrrole-viscose conducting fiber prepared with author's method can be shown up to as high as 2.106x10~(-2) S/cm. The main factors influencing the conductivity are the concentration of FeCl_3 used as dopant and initiator, the treatment time of viscose fiber as base material in FeCl_3 solution, temperature and polymerization time. It is found that the orientation and crystallization degree of viscose fiber keep constant before and after conducting treatment and the mechanical properties of conducting fiber is the same as that of base material. In addition, the distribution of polypyrrole in viscose fiber, and its effect on the conductivity were investigated in details by TEM.     

FMS在线刀具存取策略研究与系统开发

该文在已有刀具管理系统管理方法的研究基础上，针对ＦＭＳ刀具在线管理系统的结构特点，建立了ＦＭＳ在线刀具管理的体系结构，并提出了适用于ＦＭＳ、ＣＩＭＳ的刀具存取策略算法，包括进出站管理、机床局部刀库管理、中央刀库管理等几部分，最后对其进行了软件开发。     

某库岸滑坡稳定分析及治理措施研究

从地质条件出发,详细分析了滑坡的成因,以大型的岩土工程数值分析软件(ADINA)为研究手段,建立有限元计算模型,用强度折减的方法分析了滑坡体在初始工况、蓄水工况、暴雨工况、水位骤降工况和地震工况下的稳定情况,根据滑坡的失稳情况,在综合考虑的基础上,提出了削坡减载和地表排水相结合的治理措施,计算结果表明,治理措施是可行的,研究结果对设计和施工具有较大的参考价值.     

水切割机中超高压预应力复合缸体研究

针对水切割机中高压缸经常爆裂的现象,本文研究了预应力缸体、高压缸的失效原因及预应力缸体的基本特点,最后进行了缸体疲劳实验。     

Mechanical Properties of Laterally Driven Microresonance with a One-Side Straight-Leg Suspension

The mechanical properties of lateral polysilicon comb-driven microresonators suspended from one-side straight-leg beams, which are widely used in linear microvibromotors, are investigated in this paper.The lateral vibration of the microresonator was modeled assuming that the symmetry of the microstructures and the applied loads are different. Methods were given to calculate the stress, lateral displacement, spring coefficient, and resonant frequency. The results show that the simple mechanical model is a superfluous system with three unknown variables. The results differ from pervious results for a microresonator suspended from double-side straight-leg beams, which has been commonly used to design linear microvibromotors.     

复杂回转面刀具的计算机辅助造型与加工过程仿真

加工旋转锉复杂回转面刀具时，砂轮与工件的相对运动轨迹一般是复杂运动，只有用多坐标联动的数控装置才能实现，为了验证理论推导和计算的正确性，本文对旋转锉的加工过程进行了计算机仿真，为充分利用国内外在计算机图形学和CAD方面的最新成就，本文在重庆大学机械传动国家重点实验室的Sum-CAD工作站上对引进的I-deas软件包进行了应用开发，第一次将计算机造型应用于复杂回转面刀具有成形与加工，该工作站及三维图形功能对于特种回转面刀具是一个强有力的研究工具。     

浅谈机械故障诊断与排除

机械故障复杂多样，根据不同故障类型，采取相应诊断办法，可提高诊断效率。     

连铸小方坯的组织与性能研究

The hot cracking of the continuous casting bullit is connected with its macrostructure and mechanical property burnt. The macrostructure and the mechanical property of 0. 13 wt- %C continuous casting bullit was investigated. The results are as follows: 1) the classical representation of the casting bullit shows three distinct zones, a peripherial region of small equiaxed grains, a columnar zone, and a central equiaxed zone. The rapid increase of the under cooling layer thickness is the criterion of the transformation from the columnar zone to central equiaxed zone; 2) The hardness decreases with the reducing of the solidification speed; 3) The tensile strength decreases gradually from the peripherial equiaxed maximum principal strain zone to central equiaxed zone ,and increases with the drop of the temperature.     

Experimental Study on the Milling of a Ti Beta 21S

Ti Beta 21S (Ti-15Mo-2.7Nb-3Al-0.2Si) was devel op ed by TIMET in 1989. It is a metastable beta titanium alloy that offers subs tantial weight reductions over other engineering materials. Compared with common beta Ti alloys, it offers the high specific strength, good cold formability, im proved oxidation resistance, elevated temperature strength, creep resistance, an d thermal stability. Besides the common characters of titanium alloy, such as po or heat diffusivity, low elastic modulus, Ti Beta 21S has ...     

High Speed Cutting Inconel 718 with Coated Carbide and Ceramic Inserts

High speed machining (HSM) technology is one of important aspects of advanced manufacturing technology. Nickel-based superalloys have been widely used in the aircraft and nuclear industry due to their exceptional thermal resistance and the ability to retain mechanical properties at elevated temperatures of service environment over 700 ℃. However, they are classified as difficult-to-cut materials due to their high shear strength, work hardening tendency, highly abrasive carbide particles in the microstructur...