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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Effect of Surface Finish of Braced Pillars on Stress Distribution of Vacuum Plate Glass

    Ruihong Zhang
    p.450-453页
    查看更多>>摘要：The braced pillars were machined by grinding and spark machining. 3-D topography and surface roughness of two kinds of braced pillars were measured. The effect of two kinds of braced pillars on stress distribution of vacuum plate glass was analyzed by electrometric method, and was in comparison. The stress distribution of their important sides was obtained such as sealing side, supporting side and braced pillar. The experimental result showed that maximal stress of braced pillar for vacuum glass occurred in the end side of each braced pillar. Controlling high precision of the brace height and good flatness of the glass sheet considerably improve vacuum plate glass quality, such as its strength, its dependability and service life.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Three Hierarchical Optimization Design for Power Distributional Planet Gear Drive Based on Matlab

    Zhuzeng ZhuRupeng ZhuHeyun Bao
    p.454-457页
    查看更多>>摘要：According to the theory of planet gear drive and the actual design requirements of ship reducer, the mathematical model of optimization for power distributional planet gear drive is set up, the optimization design variables, the optimization objective function and the restraint conditions are definited. On the base of the establishment of three hierarchical optimization method, to take advantage of its powerful optimization toolbox in Matlab, combine the basic algorithm of optimization design, optimize respectively power distributional planet gear drive from three single-objective optimization for the lightest weight, the smallest center distance, most efficient and from one multi-objective optimization of the lightest weight and smallest center distance. The optimal results showed that ship reducer weight could be further reduced.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research of Complications Effected on Structure Angles of the Hyperboloid Twist Drill

    Chao LiLing Chen
    p.458-461页
    查看更多>>摘要：The complications that effected on key geometry parameters of the drill point had been searched in this paper by the result of 3D figuration simulation. The simulation result solved the quantificational change relations between the main structure angles of the hyperboloid drill and its figuration configuration parameters on numerical value relation. This method will give a theoretic basis and effectively optimize method for practically drill and grinding.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    A Practical Algorithm for Compensating the Whole-Error of On-Machine Measurement

    Sheng BaoPingfa Feng
    p.462-465页
    查看更多>>摘要：The On-machine measurement is usually based on the data of points. When data come from the CNC machine tools, the information they carry may be invalid. Therefore, it is unsuitable to compensate the errors by rotating and translating all data. In this paper, a practical algorithm is proposed to compensate the errors. Firstly, the valid data are picked out and sorted according to their normal vectors. By using the least square method, an error reference frame is constructed. Then the relation between the compensation values and coordinates of the theoretical points is derived. Finally, an example of aircraft structural parts is presented to validate the design.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Comparative Studies on the Cutting Performance of CVD Diamond and DLC Coated Inserts in Turning GFRP Composite Materials

    Dongcan ZhangBin ShenFanghong SunMing Chen...
    p.466-469页
    查看更多>>摘要：The diamond and diamond-like carbon (DLC) films were deposited on the cobalt cemented tungsten carbide (WC-Co) cutting tools respectively adopting the hot filament chemical vapor deposition (HFCVD) technique and the vacuum arc discharge with a graphite cathode. The scanning electron microscope (SEM), X-ray diffraction spectroscopy (XRD) and Raman spectroscopy were used to characterize the as-deposited diamond and DLC films. To evaluate their cutting performance, comparative turning tests were conducted using the uncoated WC-Co and as-fabricated CVD diamond and DLC coated inserts, with glass fiber reinforced plastics (GFRP) composite materials as the workpiece. The research results exhibited that diamond and DLC coated inserts had great advantages in cutting tests compared to uncoated insert. The flank wear of the CVD diamond coated insert maintained a very low value about 50μm before the cutting tool failure occurred. For the DLC coated insert, its flank wear always maintained a nearly constant value of 70～200μm during whole 45 minutes turning process. The flank wear of CVD diamond coated insert was lower than that of DLC coated insert before diamond films peeling off.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experimental Investigation on Dry Point Grinding Process Based on Green Manufacturing

    Shichao XiuZhijie GengGuangqi Cai
    p.470-473页
    查看更多>>摘要：Due to point contact cause, the point grinding process have the lower grinding power and heat to measure and the better cooling conditions. For green manufacturing, the point grinding process has the significance to reduce the consumption of grinding fluid and improve the ground surface integrity and the process greenness. This study analyzes the geometric configuration of the contact area between the wheel and the workpiece in point grinding process, establishes the geometric and mathematic models of the contact area, and investigates the relations between the grinding parameters. The dry point grinding experiments are performed on the ground surface integrity. These investigations show that the dry grinding can be achieved in point grinding process under less depth of cut and the higher grinding speed for the high machining greenness demand.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Comprehensive Evaluation Analysis and Optimization Methodology of Tool Geometric Parameters for High Speed Cutting

    Pingfa FengDaochun XuZhijun WuDingwen Yu...
    p.474-478页
    查看更多>>摘要：Tool geometric parameters, which are key factors to be considered in tool design, have a direct effect on tool cutting performance. Based on the diversity and complexity of geometric parameters and technological goals, we select cutting force and temperature as initial input conditions to build a comprehensive dimensionless tool geometric parameters evaluation method. According to the multilevel weight relationships between the technological goals and the basic cutting characteristics, the evaluation factors for cutting force and temperature are determined. The comprehensive evaluation method (CEM) is then applied to analyze and optimize the key parameters of a saw milling tool. As shown by the research results, the parameters obtained by the CEM prove that some tool parameters from actual production were reasonable, while others had re-optimized space. The CEM is shown to be effective and feasible. Also, the analysis results have an explicit guiding function for production practice.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Experimental Study on Chip Shape and Tool Wear of High-speed and Micro-feed Cutting

    Daochun XuPingfa FengDingwen YuZhijun Wu...
    p.479-482页
    查看更多>>摘要：With increasing spindle speed the cutting will be easy to enter into micro-feed cutting region. In the paper, the chip thickness and shape of high-speed and micro-feed cutting was researched in orthogonal milling. The cutting times in different fz was analyzed. We calculate the effective rake angle, friction angle and shear angle Furthermore, we measure cutting edge arc wear and tool flank wear of micro-feed cutting. Shown as the research results, the phenomenon of empty cutting and pure extrusion is very obvious as the feed rate per tooth is lower than 0.011mm/z. As the feed rate per tooth is lower than 0.005mm/z, the tool wear form is mainly cutting edge arc wear. As fz achieves 0.015mm/z, tool wear will decrease obviously and the tool appears the self-sharpening phenomenon.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Research on Particle Characteristics of Cellulosine Used in Generation Basing on Two-phase Flow of the Gas and Solid

    Lanyu YangYan Ma
    p.483-486页
    查看更多>>摘要：The amount of remainder in wooden biomass resources available which was used for power generation in China was surveyed. Technique feasibility of the wooden remainder used in power generation was analyzed. A super fine cellulosine disintegrator for power generation was designed, which combined both characteristics of the wooden biomass and particle size of the cellulosine for power generation. The cellulosine particles which were obtained were put emphasis on analyzing and all kinds of stressed conditions were obtained during process of the grading under the environment for two-phase flow of the gas and solid. One kind of grading model of the cellulosine particles for power generation was established in view of all kinds of the influence factors comprehensively. One kind of calculation method for grading particle-diameter of the cellulosine particle, and the experiment results showed that this method was feasible.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    3D FEM Simulation and Experimental Research of Springback in Bending Process of Aluminum Alloy Sheet

    Xia JinShihong Lu
    p.487-490页
    查看更多>>摘要：Bending of the aluminum alloy is one of the processes frequently applied during manufacture of aircraft sheet metal. The bending operation involves springback, which is defined as elastic recovery of the part during unloading. In manufacturing industry, it is still a practical and difficult problem to predict the final geometry of the part after springback and to design appropriate tools in order to compensate for springback. In this study, 3D commercially available finite element analysis (FEA) software-MARC is used to analyse bending and springback of different aluminium materials (LY12CZ) with different thickness. The amount of springback, total equivalent plastic strains and equivalent von mises stresses are obtained. Moreover, the relation between bent angle and springback angle, R/t ratio and springback angle are presented and discussed in detail. The comparison results of FEA result and experiment data indicate that the FEM (finite element analysis method) simulation is a power tool for the highly accurate prediction of springback behavior in sheet metal bending.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd