切屑

The samples are received cutting test, and compare their chips withthose of HPb59?, we find that the cutability of nonleaded freeutting is70?096 of that of HPb59?.

将研制的试样进行切削加工，并将其切屑与HPb59-1的切屑进行比较，测得该易切削黄铜的切削性能可达到HPb59-1的70-80％。

The mechanism of impacts of cutter runout on the pratical cutting radius, chip form and chip thickness was studied and analyzed.

研究了径向跳动对刀齿的实际切削半径、切屑形状以及切屑厚度的影响机理。

In view of the questions in theoretic analysis and numerical simulation with the finite element method,the separation criterion of chips, the surface contact, the setting of friction coefficient,and the thermal stress coupling are researched. A simulation example is presented by applying the finite element analysis software-ANSYS,and the change of stress and strain in metal cutting process, the forming of shear plane and the influence of the temperature field on metal cutting are analyzed. The tool's strength is also analyzed.

基于理论分析和实际有限元数值模拟计算中遇到的问题，研究、讨论了切屑分离标准、表面接触、摩擦系数的设定、切屑与工件之间的连接以及热应力耦合分析等各项技术，并应用大型有限元分析软件ANSYS，具体分析了金属切削过程中应力和应变的变化、剪切面的形成以及温度场对金属切削的影响，并依此对刀具作强度分析，得到若干结论。

With the same cutting parameters, same chip types can be gained in either the nodal zone or the internodal zone. In other words, the principles of chip formation are entirely the same in these two different zones.

在试验条件相同的情况下，对竹节部和节间材切削，会形成相同类型的切屑，即其切屑形成机理相同。

Through the observation via scanning electron microscope,we can discover that chips mainly have three types of micro-shapes like acicular,massive and squamose,its formation corresponds to PBX macro-fracture which caused by the nucleation and growth of crack and mainly embodied as transgranular fracture of explosive particles.

利用SEM观测发现PBX切屑主要有针状、块状和鳞片状三种细观形态，切屑的形成体现为裂纹的成核扩展导致的宏观断裂，并主要表现为炸药颗粒的穿晶断裂。

Especially in processing of the special metallic materials. According as the adaption orthogonal tool edge bottom diameter and scraps' groove of taps ,using computer aid design the taps' trough shapes of taps, in order to tangency of the orthogonal .scraps' groove and tool edge' hack angle, making the scraps into streamline rolling scraps.

尤其被加工材料是特种金属时，根据丝锥所适合的前角、刃瓣、心径以及所允许容屑槽大小，运用计算机辅助设计改进丝锥槽形，使得丝锥前角、槽底圆弧以及齿背角光滑连接，切屑成流线形卷屑。

The effect of rake angle and cutting velocity on the shear strain imposed in the chips, microstructure and hardness of chips are highlighted in a variety of metals and alloys.

本文对比了不同的金属和合金在各种刀具前角和切削速度条件下，切屑上产生的剪应变、切屑的微结构及其硬度的变化规律。

The rake face normal curvatures of a ball nose end mill in normal direction and chip flow direction are analyzed and calculated in detail in this paper.

采用微分几何中的曲率分析方法对球头立铣刀前刀面上端刃法线方向和切屑流出方向的法曲率进行了详细的分析计算，并给出了切屑流经前刀面时卷曲半径的计算方法。

In this paper, the variations of the shear strain imposed on the chips as well as on the microstructure and the hardness of chips under the condition of different tool rake angles and various cutting velocities are investigated for different metals and alloys.

文中比较了不同的金属和合金在各种刀具前角和切削速度下，切屑上产生的剪应变、切屑的微结构及硬度的变化规律。

The cutting pattern and load curves of cutting process of the two cutting heads were given by computer simulation, which showed that the cutting performance of the cutting head with pick arrangement based on equal-rise-angle spiral line was good because of its reasonable pick cut, its uniform cutting pattern and the small value and the fluctuation of its load.

为了评价利用等螺旋升角进行截齿排列设计的截割头的截割性能，选用了一个实际的截割头进行比较，通过计算机仿真获得两个截割头截割过程的切屑图和载荷曲线，经比较分析表明，用等螺旋升角排列截齿的截割头截槽合理，各段切屑图均匀，载荷大小及其波动较小，截割性能良好，所以用等螺旋升角排列截齿是一种高效、实用的截齿排列方法。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。