滚进

They can improve the measuring resolution 2-3 grade higher then ordinary direct subdivision technology. Based on Windows 95 operating system and object-oriented technology, a PCbased open architecture CNC hobbing system (including software platform and servo driving) has been developed and used in Y83A hobber successfully.

开发了基于PC总线的内嵌式开放结构的CNC滚齿机数控系统的配套硬件结构：滚齿范成运动的闭环数字式交流伺服驱动系统和滚刀轴向进给运动的步进伺服驱动系统。Y38A滚齿机上的应用实践，证明所进行的改造和开发的开放式CNC滚齿系统是可行的、成功的。

Based on the former works by our group, the variable induction devices including swirl and tumble variable devices were developed and the variable induction and twice injection were combined to optimize the lean burn combustion and improve fuel consumption and emissions in this thesis.

本文在课题组前面研究工作的基础上，设计了可变涡流与可变滚流两种滑动式可变进气结构，并将可变进气与二次喷油结合起来优化稀薄燃烧过程，改进发动机经济性与排放性能。

He plunged into the swimming tank or went hunting with the Judge's sons;I he escorted Mollie and Alice, the Judge's daughters, on long twilight or early morning rambles; on wintry nights he lay at the Judge's feet before the roaring library fire; he carried the Judge's grandsons on his back, or rolled them in the grass, and guarded their footsteps through wild adventures down to the fountain in the stable yard, and even beyond, where the paddocks were, and the berry patches.

他跟法官的少爷们跳进游泳池或出去打猎。当法官的女儿默里和艾丽丝在黄昏或凌晨长途漫步时，他护送她们。冬天的夜晚在书房烧得正旺的火炉前，他趴在法官的脚下，他把法官的外孙们驮在背上，或是让他们在草地上滚来滚去，并保护他们徒步进行疯狂的探险；一直到马厩那里的水龙头那儿，甚至更远，到牧场和草莓圃那儿。

As a result, by merely replacing the gasoline injector with natural gas injector, a large volume of natural gas is injected on the intake valve and then reflected, which makes the fuel concentration and pressure field in the intake manifold after the natural gas injection for the natural gas engine differ greatly from those for gasoline engine.

结果表明，若仅把MPI汽油机的喷油器用天然气喷射阀更换，大量的天然气喷到进气阀后反射，造成天然气发动机进气岐管内的燃料浓度场、压力场与MPI汽油机明显不同；并且进气阀被打开后，先期吸入气缸的天然气在纵向滚流的作用下被挤向进气阀底部下方，与后期吸入气缸的空气形成明显的分层充气构造。

The results of this study indicate that changing the angle of the intake port has a profound effect on the flow field during the intake stroke of the engine cycle. For the case with the intake-exhaust valves canted at zero degree (the so-called vertical valves), the tumble ratio, swirl ratio, turbulent intensity, and turbulent kinetic energy in the direction perpendicular to the bisecting plane of the cylinder are at their highest levels than those obtained for the other cases. This effect is most pronounced after the compression stroke of the cycle. As a result of this study, it is observed that the behavior of the overall flow field from the intake to the completion of compression stroke has a major impact on the effectiveness of the mixing of fuel-air prior to the ignition of the engine cycle.

结果显示，改变进排气阀的倾斜角度对进气期间的流场变化有很明显的影响，其中以垂直阀(进排气阀倾斜0度)所得的 Y轴向(Y方向系垂直於将汽缸对分为二平面的方向)滚流强度、涡漩比、紊流强度、紊流动能等流场强度为最强；若以流体经活塞压缩后的流场特性进行探讨，所得结果显示压缩冲程对汽缸内流场的效应是不容忽视的；因此由进气到压缩过程结束的整体流场现象，才是影响引擎点火前的油气混合程度与燃烧品质的关键。

GEORGE:(pantomimes sticking an imaginary knife in his heart and twists it) Oh geeeee..

乔治：（假装一把小刀刺进胸口，还转上一圈）额滴神……滚，滚！

The results show that in the formation process of tumble during the intake stroke,two vortexes are generated in the cylinder.

增加流经排气门侧的进气气流或抑制直接沿进气门侧缸壁流入气缸的气流，都能提高滚流强度。

Company under the Quebec-die factory was established in 1999, after years of exploration and research, has been successfully developed high-speed roller chain Pin-, two-way high-speed riveting first-, pre-pull machine, such as Progressive Die All kinds of roller chain production equipment and mold, in addition to the company to meet demand, but also for domestic and foreign sales.

公司下属的魁峰模具厂成立于1999年，经过多年的探索研究，现已成功地开发出滚子链高速销轴机、双向高速铆头机、预拉机、级进模等各种滚子链生产设备和模具，除满足公司需求外，还面向国内外销售。

According to the literature about the manufacture models of three kinds,radial feed- rolling cutter ,broach and Gleason cutter,the effect of centre point-centre line method,centre deviation method and oblique feed on qualified gear length were inspected.

根据滚刀、拉刀及格利森铣刀盘三类径向进给的制造模型相关文献，考察了中点中线法、中心偏移法、斜向进给对给出合格齿长的影响，指出了各类刀具的制造模型的异同，为这种研究提供了借鉴

The results show that the maximal rolling pressure and the maximal strain in rolling process don't appear in the same location; the plastic strain areas locates on the both sides of the edge at the fillet, resulting in residual compressive stress reached to strengthen the purpose of rolling.In the rolling process, must be reasonable to control the feed roll.

结果表明，滚压过程中最大滚压力和最大应变不是出现在同一位置，塑性应变区域位于圆角凹面两侧边缘，冷作硬化后产生的残余压缩应力达到了滚压强化目的；滚压过程必须合理控制滚压进给量。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。