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A theoretical model for calculating the cutting angle with different crystal planes, orientations and tool orthogonal rakes are described in this paper. It is built with the ultra-precision cutting model by the principle of the maximum specific energy of shear deformation and the mechanism of change of the shear modulus with...

本文利用剪切变形比能最大及单晶材料不同晶面晶向剪切弹性模量不同的原理,结合超精密切削模型,从理论上计算出不同晶面、不同晶向及不同刀具前角超精密切削条件下的剪切角,得到其在不同切削条件下的变化规律,并由此解释了切削加工中由KDP晶体各向异性所导致的工件表面粗糙度的各向异性。

The thesis has executed system's assistant function design, It realized frame and title bar's drawing、 table drawing、 surface roughness tolerance's label、 norm symbol's label and shape tolerance's label and so on to complete rapidly.

进行系统的辅助功能设计,实现了图框和标题栏的绘制、明细表的绘制、表面粗糙度的标注、基准代号标注以及形位公差标注等辅助功能的快捷完成。

This research presented a new guide mechanism and belt driving theory of the abrasive band polishing for inner aperture, satisfied the driving requirement of abrasive belt leading smoothly into grinding area, realized the band grinding and band polishing of inner aperture, developed a abrasive band polishing headstock for of the ball track of ball bearing and roller bearing individually adopting a way of curvature concave oscillating and vibrating, researched the process regular and fundamental process method and parameter of abrasive band polishing of ball track. The results of experiments and tests showed that the surface roughness of ball track by abrasive band polishing can reach Ra0.02μm, and the original geometric cross section shape precision of ball track can be kept.

本项研究提出了砂带研抛内孔的新型导引机构和传带原理,满足了砂带平稳导入内孔磨削区的传动要求,实现了内孔的砂带磨削和研抛;研制了采用弧面摆动和振动方式分别用于球轴承滚道和滚柱轴承滚道研抛的砂带研抛头架;研究了轴承滚道砂带研抛的工艺规律和基本工艺方法、工艺参数;实验测试结果,轴承滚道砂带研抛的表面粗糙度达Ra0.02μm,研抛过程保持了滚道的原始几何截面形状精度。

Filtering materials in the form of very fine powders exhibit greater surface area than coarser granules.

以非常美好的粉末的形式过滤的材料比更加粗糙的粒子陈列更加巨大的表面。

The operating principle and component of the shadowgraph experimental station were introduced. The clear shadowgraph of target was gained after construction. Using this technique, the calculative method of DT ice thickness and the surface roughness analytic method of target were realized. Through design simulative experiment, the shadowgraph of DT ice was got.

主要介绍了背光成像实验样机的组成及工作原理,讨论了各光学部件的选择,在原理型样机建成后,获得了玻璃微球靶高质量的背光图像,通过对背光影像的光路图分析与测量(测量精度达到1μm),掌握了靶球DT冰层厚度的计算方法;初步建立了靶球二维内外表面粗糙度分析方法;通过设计模拟实验,获得了冰层在微球靶丸内均匀分布后清晰的背光影像。

On the basis of study on two projects:"10-DOF ultrasonic detection system for complex surfaces part" and "Ultrasonic water-logging automatic survey system for rods", this thesis studies the technologies of ultrasonic measurement, kinematic and dynamic modeling of 10-DOF ultrasonic system, real-time sensitivity auto-adjusting, integrated technology of ultrasonic measurement, surface construction and ultrasonic detection for complex surface parts and rods, thus improving the accuracy and efficiency of ultrasonic detection for parts of complex surfaces. Meanwhile, an auto-detection system for metal rods with rough surfaces and bad columniform accuracy is presented for the first time.

本文结合&10自由度复杂曲面超声检测系统&和&棒材水浸超声自动检测系统&两个项目的研究,主要开展了超声测量、检测机器人运动学和动力学建模、误差补偿、灵敏度自动补偿和曲面构件超声检测一体化技术和轴棒类构件超声检测一体化技术的研究工作,进一步提高了复杂型面构件超声检测的效率和精度,并首次针对表面粗糙、圆柱度较差的金属轴棒类构件开发出了高效率的自动化检测设备。

As he went lower, he saw that it spread among small promontoriesand inlets of rough, sharp rock, and the crisping, lapping surface showed stains斑點 of purple and darker blue.

越往下走,他发现它的四周有很多小岬和满是又尖又粗糙的岩石的水湾,被波涛拍打的易碎的表面上显出紫色和深蓝色的斑点。

In comparison to the process simply using a Hall ion source for the IBAD, the coating has a more compact and uniform structure and a better property in polishing. After surface modification, the surface roughness of the substrate is reduced to 0.635 nm which is the same as that of the S-SiC substrate, also the surface reflectance is obviously enhanced to that of the fine polished zerodur glass.

测试结果表明:与单纯霍尔离子源辅助方法相比,该工艺方法制备的Si改性涂层生长得更加致密、均匀,抛光特性良好;改性抛光后表面粗糙度降低到0.635 nm,达到了S-SiC基底的水平;改性后RB-SiC基底的反射率明显提高,达到了抛光良好的微晶玻璃的水平。

The results show that when an electromagnetic field with 1000 Hz frequency and 20 kW power is imposed, the surface roughness of hollow billets is decreased by 50%, the solidification structure is refined, the tensile strength is improved by 40%, and the elongation is improved by 50%, averagely; when the power is heightened to 30 kW, the solidification structure is coarsened and the mechanical properties are worsened.

研究结果表明:当施加频率为1kHz的电磁场时,空心管坯的表面粗糙度降低了约50%;当施加功率为20kW的电磁场时,空心铜管坯的组织得到细化,抗拉强度提高了约40%,延伸率提高了50%;当施加30kW的电磁场时,铜管坯组织粗化,力学性能下降。

This offers greater ability to absorb the surface roughness typical of off road routes because the wheel withdraws lengthways without affecting the steering and the antisquat angle has been increased.

这提供了更大的能力来吸收表面粗糙度典型的越野路线的,因为这轮退出,而不会影响转向和antisquat角度纵向有所增加。

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I didn't watch TV last night, because it .

昨晚我没有看电视,因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来,在北京的很多小区里,电梯液晶电视被撤了下来。

I'm running my simile to an extreme.

我比喻得过头了。