削磨

The shredding of agro-residues, such as corn stalk, straw, wood sawdust and other herbaceous biomass, were investigated in this dissertation. According to the machinery mechanics of shredding, the components, shearing strength and pressive strength of the biomass were analysed in theory, which played a critical role during the shredding process. And the powder was examined by Scanning Electron Microscopy. It was founded that shearing,splitting and grinding force were appropriate for shredding biomass. The results also showed that primary shredding was the bulk shredding model, which was mainly affected by shearing and splitting force, therefore the curly knife and the straight knife were useful; while the fine shredding was the surface shredding model, affected by splitting and grinding force, and the straight knife useful.

本文以农林废弃生物质为研究对象，结合机械力破碎基础理论，从影响其破碎的化学组分和剪切强度、抗压强度等力学角度进行了理论研究，并运用扫描显微镜对破碎产物的微观结构进行了实际分析，结合二者得出如下结论：最适合生物质的施力方式为剪切力、劈碎力和磨削力；生物质粗破碎为体积破碎，主要受剪切力和劈碎力作用，刀片宜设计成弯口刀和单面直刃刀；细破碎为表面破碎，主要受剪切力和磨削力作用，刀片宜设计成双面直刃刀。

Purpose: To compare the effectiveness and safety between laser subepithelial keratomileusis and conventional laser in-situ keratomileusis for high myopia.

目的：对比观察准分子激光上皮瓣下角膜磨削术与准分子激光原位角膜磨削术治疗高度近视的临床疗效。

The results showed that the unproper grinding parameters resulted in the grinding cracks.

得出，其裂纹系磨削不当造成的磨削裂纹。

The difficulty in NC grinding is that the size of the work piece cannot be invariable because the grinding wheel will be abraded continuously in the grinding process.

数控磨削加工的难点在于，由于砂轮在磨削过程中是不断磨损的，因此使得被磨工件的加工尺寸不能恒定。

In surface grinding experiments of casehardened 16MnCr5 a close correlation between the related grinding power Pc and the maximum average temperature Tmax in the contact zone between workpiece and gr...

而磨削表层金相组织状态和发生烧伤主要决定于接触区的温度，因而可以应用相对容易测量计算的单位面积磨削功率P_c来识别这些状态。

This peper determinated main component and Performance of griding fluid thatvary with machining during the process of grinding.

测定了磨削过程磨削液主要成分和性能随加工的变化。

This paper analyses the relation between the cutting force and cutting depth in the course of belt grinding,builds the mathematics model of optimum cutting parameter to improve efficiency and intensity,and proposes the processing method for controlling griding precision of rotary thin-wall parts.

通过实验分析了带轮磨削过程中切削力和切削深度之间的关系，从提高切削效率和强度出发，选择优化切削参数，建立了切削参数数学模型；提出了控制回转形薄壁零件磨削精度的加工方

The research results showed that resin bond could hold the self-sharpening diamond more tightly than ordinary diamond, for CSD diamonds have irregular shape, rough surfaces and many incurvated angle. Under the condition of the same grinding efficiency, the grinding ratio of resin bond grinding wheels made with self-sharpening diamond was 1.6 times as high as that of the grinding wheels made with ordinary diamond.

试验结果表明，由于CSD形状不规则，有许多凹入角和粗糙表面，树脂结合剂对CSD的把持力较普通金刚石强，所以在磨削各参数相同的条件下，自锐性金刚石砂轮与普通金刚石砂轮相比，其磨削比提高60%以上。

The variation rule of grinding force was explained with surface topographies of wheel and workpiece.

分析了修锐前后砂轮表面与对应磨削试件表面的微观形貌机理，解释了影响磨削力变化的因素。

According to the experiences of experiment teaching,we have developed a kind of measuring diameter instrument used in error statistics and analysis in auto lathe of single axle and high precision grinding machine.

根据实验教学的经验，研制了一种用于单轴六角自动车床和高精度通磨无心床做加工误差统计分析的实验教学使用的千分表测径仪，并对几批车削工件和磨削工件进行现场测量，并进行加工误差的统计分析。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐