线弧

Ier curves of nine-degree and the arc length represented by the polynomial form are also obtained.

ier曲线精确表示的等距线和多项式形式的弧长表达式。

This study is very important to offline programming of arc robot in spaced welding.

这一研究对空间曲线的弧焊机器人离线编程提供了重要的技术支持。

Enterprises to adopt advanced production equipment and testing equipment, has automatic variable cross-section mill CNC, automatic volume headphones, automatic CNC Control Step-by-step heat treatment furnace, hardening machine, stress shot peening machines, automatic assembly line, electrostatic spray lines, etc.; with professional Physicochemical room and laboratory, equipped with polishing machine, vertical metallographic microscope, spectrophotometer,¨furnace, carbon and sulfur analyzer United, fatigue tester, stiffness tester, high-arc machine Rockwell Hardness Tester and a full range of advanced testing equipment.

企业采用先进的生产设备和检测设备，有全自动数控变截面轧机、全自动卷耳机、全自动数控步进式热处理控制炉、淬火机、应力喷丸机、全自动组装线、静电喷漆线等；设有专业的理化室和试验室，配备抛光机、立式金相显微镜、分光光度计、定碳炉、碳硫联合分析仪、疲劳试验机、刚度试验机、弧高分选机和洛氏硬度计等先进齐全的检测设备。

At the point at which that line intersects the ellipse, windows begins drawing an arc in a counterclockwise direction around the circumference of the ellipse. windows also uses an imaginary line to connect with the center of the ellipse.

在这条线与椭圆相交的点，windows 开始逆时针方向环绕椭圆的周围绘制一个弧。windows 也用一条假想的线连接和椭圆的中心。

The results showed that the fracture toughness of the weld of HFW pipe was lowest.The value of absorbed energy of HFW weld was closely related to the heat treatment process.But the fracture toughness of fusion zone of submerged-arc welded jointer,its microstructure was coarse granular bainite,and was lower than the other locations of heat affected zone;and with the increasing of steel strength,the effect of welding heat cycles on the pipeline steel became stronger,and form coarse microstructure in fusion zone leading to decrease fracture toughness.

结果表明，高钢级管线钢高频焊接焊缝处的断裂韧性最低，其冲击功大小与热处理工艺密切相关；而埋弧焊接热影响区断裂韧性在熔合线处最低，其主要原因是此处的组织为粗大的粒状贝氏体，而且强度越高焊接热循环对管线钢的作用越强，在熔合线附近更容易产生粗大组织，使断裂韧性降低。

In this paper, a brief analysis of the mechanism of overhead insulating conductor broken by lightning was introduced, and some detail information about the structure and principle of some anti-lightning broken device, such as over-voltage protector, arc-protection hardware and FLC-B lightning-protection hardware. And some electrical tests and analysis were done to these devices, after multi-comparison of those devices' performance, some specific measures are proposed against lightning broken.

本文简要分析了架空绝缘导线雷击断线的机理，详细介绍了过电压保护器、防弧金具和FLC-B型防雷金具等常用防止架空绝缘导线雷击断线装置的结构和工作原理，并对这些装置进行各种电气试验与分析，综合比较各种装置的性能之后，提出了10kV架空绝缘导线防雷击断线的具体措施。

It possesses 300 sets of medium and larg equepments,including CNC cutting machine ,punching machine, CO2 gas protecting and argon arc welder,linear cutting machine,shearing machine,wheel rim forming machine and three spraying paint and assembly lines,etc.

总厂设有车轮与三轮车两大分厂及一个海南分厂，拥有数控机床冲床 CO 保护焊机亚弧焊机线切割机剪切轮辋成形专机等大中型设备 300 余台套，拥有 3 条先进的涂装线，从而保证了产品的内在质量，其中车轮年生产能力达到 1 2 0 万套。

The test results show that the crispest HAZ occurs in the process of welding of the 14MnNbq steel on the first heat circulation submerged welding overheat zone and the second heat circulation submerged welding overheat zone plus the not entirely re crystallized zone. The 14MnNbq steel has a tendency of being crisper due to overheat than the SM490C steel is. In order to ensure the toughness of the welding HAZ′s, the welding wire capacity should be properly controlled during welding.

由试验结果表明，14MnNbq钢焊接HAZ最脆区出现在一次热循环的埋弧焊过热区及二次热循环的埋弧焊过热区+不完全重结晶区；14MnNbq钢比SM490C钢有更强的过热脆化倾向，为确保焊接热影响区韧性，焊接时应适当控制焊接线能量。

The structures, features, application principles and on-site applications of six kinds of prevention products developed on the basis of above mentioned methods, i.e., the insulation striped arc-protection fitting, clamping post porcelain/ composite insulator, stab-type arc-protection fitting, stab-type clamping post porcelain/composite insulator, ring electrode MOA with external series gap and stab-type electrode MOA with external series gap, are presented.

分析了10 kV配电网绝缘导线雷击断线机理，归纳出&疏导式&和&堵塞式&2种防护思路，介绍了基于2种防护思路研制的剥线型防弧金具、放电箝位柱式瓷/复合绝缘子、穿刺型防弧金具、穿刺型放电箝位柱式瓷/复合绝缘子、环形电极带外串联间隙金属氧化物避雷器和穿刺电极带外串联间隙金属氧化物避雷器6种防护产品的结构、特点、应用原则及现场应用情况。

With considering the heat flux distribution along the direction of the work piece thickness, a modified model of 3-D conical heat source mode is put forward. Though it can be used to calculate the weld width on both the top and the bottom surfaces of the work piece exactly, but for the location and locus of the melt line in the weld cross section, the calculating precision is lower.

考虑到等离子弧热源沿厚度方向分布，本文首先提出了改进的三维锥体热源模式，可以使等离子弧焊缝正面和背面尺寸与实测结果吻合，但焊缝横断面熔合线的走向与实际有较大差别。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。