| 1. | When the identical experiment was performed with mature segments of roots, no inhibition was observed .
用成熟的根切段进行同一个实验时，未观察到抑制作用。 |
| 2. | The undercut controlling of involut cylinder gear shaving
渐开线圆柱齿轮剃齿过程中的根切控制 |
| 3. | Thread run - outs and thread undercuts for external threaded fasteners
外螺纹紧固件用退刀螺纹和螺纹根切 |
| 4. | Dice the beetroot ( up ) neatly
将甜菜根切成整齐的小方块 |
| 5. | Criticalnumber tooth for no undercutting
无根切临界齿数 |
| 6. | With the new - simple method , the equation of circle - arc - enveloping curve are deduced . also the relationship between the arc radius , the radius of center distribution and the distance of centers is given to avoid undercutting
文中采用新方法推导出了圆弧包络线转子型线方程，还给出了避免出现根切现象的圆弧半径、圆弧圆心分布圆半径以及中心距三者之间的关系。 |
| 7. | On the basis of selecting such assignment range of gear module and eccentricity that there would be no undercut for shaping the teeth of noncircular gears , dynamically graphic simulation of the shaping process was conducted on the computer by using the mathematical model developed
在分析范成加工外啮合非圆齿轮不根切的模数、偏心率取值范围的基础上，根据所建模型将加工外啮合非圆齿轮的范成过程用计算机进行了动态图形仿真。 |
| 8. | After thoroughly analyzing the influence of each pump parameters on the gear pump performance , the paper developes the criterion for optimum gear parameters , which can be utilizied in practice easily for gear manufacturing using normal involute gear hob with two - fillet type . the conclutions studied by the paper are : 1 . both the addendum coefficient and the deddendum coefficient of the pump gear should be 1 . 125
以目前国内普遍使用的双圆弧头全齿高为2 . 5倍模数渐开线标准滚刀作为泵齿轮的加工刀具，通过对齿轮加工原理的分析，提出了欲使泵齿轮参数达到最佳，泵齿轮的齿顶高系数和齿根高系数都为1 . 125 ；对变位系数的确定应考虑到泵齿轮的根切、齿顶厚、重合度以及侧隙因素；泵齿轮为避免过渡曲线干涉，必然要存在根切现象。 |
| 9. | The thesis developed the optimization design software of geometric parameter for the worm gear including strength check module , the drawing contact lines module , the change lines of tooth thickness of worm , and the parametric modelling software for the reducer which includes parametric modelling of parts and assembly . the cad prototype system is very convenient because of its accessible interfere , simple operation and written in chinese . by input design parameters ， the cad system can make optimization design and strength check for the worm gear ， draw contact lines of tooth flank of worm - gear and change line of tooth thickness of worm ， judge if the tooth flanks of worm undercut and if the sideward tooth of worm - gear hob come to a point ， make project design and structure design for the reducer and draw its 2d parts and assembly
研究和开发了平面二次包络环面蜗杆传动的参数优化设计和校核软件系统：包括几何参数设计计算模块，强度校核模块，绘制齿面接触线模块，蜗杆齿厚变化曲线模块和蜗杆根切判别模块；开发了平面二次包络环面蜗杆减速器外形与结构尺寸数据库以及传动效率数据库，建立了平面二次包络环面蜗杆传动公差及极限偏差数据库；开发了平面二次包络环面蜗杆减速器参数化建模软件：包括零部件的参数化建模模块和装配图的参数化建模模块，其中零部件的参数化建模包括蜗杆轴系的参数化建模、蜗轮轴系的参数化建模、箱体的参数化建模、端盖的参数化建模、轴承的参数化建模和其它零部件的参数化建模软件模块。 |
| 10. | On the condition of “ many - head ” and “ small drive ratio ” ， the plane double enveloping hourglass worm can not settle the problem of undercutting and sharpening simultaneously . it has devoted to a new type hourglass worm _ sphere double enveloping hourglass worm . the coordinate system is established according to the frock . the meshing equation and the tooth equation of worm and gear have been developed and the distribution of contact line on gear tooth is analyzed . to evaluate the meshing quality ， four meshing quality indexes and five original parameters are put forward . through mass programming computing ， the relations between meshing quality and original parameters are derived and depicted by graphs
考虑到平面二次包络环面蜗杆传动在多头小传动比条件下根切与齿顶变尖的矛盾很难同时解决且啮合性能较差，介绍了一种新型环面蜗杆传动? ?球面二次包络环面蜗杆传动.在研究过程中，根据工装建立了坐标系，根据一二包过程的运动关系推得了啮合方程和蜗杆与蜗轮的齿面方程，分析了蜗轮齿面上的接触线分布.为了评价啮合性能，提出了4项性能指标和5项原始参数，通过大量编程计算得到了啮合性能指标与原始参数之间的关系，并以图表直观的表示 |
