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Wire electrode based on the trajectory of the different forms of control, WEDM can be divided into three types: one is shaped by the imitation controlled cutting in line in advance and work to create the same shape by mold, when processing the workpiece at the same time rough and on the mold clamping in the machine tool table, in the process of cutting wire electrode tightly against the mold on the edge of the track for the mobile, thus cutting out and die on the same shape and precision to the workpiece; another One is the electro-optical tracking control, to carry out the cutting line, before the basis of certain parts to enlarge the proportion of drawings depicts an electro-optical tracking map-processing machines will be placed in design stage of electro-optical tracking, tracking platform Photoelectric first line of graphics has always been to follow the track of the Mexican campaign, and then through the use of electrical, mechanical linkage to control the machine tool table, together with the workpiece so相似形wire electrode relative movement, thus cutting out the same shape and design to the workpiece; again a digital control, the use of advanced automatic control of digital technology-driven machine tool in accordance with the pre-processing parameters according to the workpiece geometry pre-processing procedures for the preparation of a good CNC auto-complete processing, the production does not require appearance on board the need to map to enlarge map of the previous two form of control has a higher machining accuracy and a broad range of applications, both at home and abroad more than 95% have adopted WEDM NC.

根据对电极丝运动轨迹的控制形式不同，电火花线切割机床又可分为三种：一种是靠模仿形控制，其在进行线切割加工前，预先制造出与工件形状相同的靠模，加工时把工件毛坯和靠模同时装夹在机床工作台上，在切割过程中电极丝紧紧地贴着靠模边缘作轨迹移动，从而切割出与靠模形状和精度相同的工件来；另一种是光电跟踪控制，其在进行线切割加工前，先根据零件图样按一定放大比例描绘出一张光电跟踪图，加工时将图样置于机床的光电跟踪台上，跟踪台上的光电头始终追随墨线图形的轨迹运动，再借助于电气、机械的联动，控制机床工作台连同工件相对电极丝做相似形的运动，从而切割出与图样形状相同的工件来；再一种是数字程序控制，采用先进的数字化自动控制技术，驱动机床按照加工前根据工件几何形状参数预先编制好的数控加工程序自动完成加工，不需要制作靠模样板也无需绘制放大图，比前面两种控制形式具有更高的加工精度和广阔的应用范围，目前国内外95%以上的电火花线切割机床都已采用数控化。切割属电加工范畴，是由前苏联人发明的，我国是第一个用于工业生产的国家，当时由复但大学和苏州长风机械厂合作生产的这是最早的机型叫复旦型，我们国内在此基础上发展了快走丝系统。欧美和日本发展了慢走系统LS

Heat deformation of the machine tool spindle system is one main reason which affects the accuracy of the machining, so the heat design of the machine tool spindle system play an important role in designing the machine tool. Research of this area had been made more progress at home and abroad, but extent and deepness of theory and engineering application is not enough.

机床主轴系统的热变形是影响机床加工精度的主要原因之一，因此机床主轴系统的热设计在机床设计中占据重要地位，国内外在该领域的研究虽然取得较大进展，但理论和工程应用的广度和深度还不够。

ABSTRACT Based on the analysis of recent research on machine tool spindles at home and abroad, this thesis makes the thorough study on the dynamic behaviour and static stiffness of machine tool spindles and develops a new kind of machine tool spindle of good dynamic behaviour.

本文在分析国内外机床主轴部件研究现状的基础上，深入研究了机床主轴部件的动、静态性能，并开发了一种新颖的具有优良动态性能的高阻尼机床主轴部。。。

The products sold well both at home and abroad, it seeks hi-tech and high quality brand as managing ideal; good credit, image, making friends and developing the market as the managing purpose, the SF-type auto-lubrieating oil free bearing series have used in the sliding parts of various machines such as automobile, motorcycle, textilo machinery, printing, tobacco, food machine, micro-electric motor, metallurgy, mining machinery forging machine tool, lifter, We design and produce high quality, low price bearing produces to meel the needs of all customers over the world.

公司生产的自润滑无油轴承系列，广泛应用于各种机械的滑动部位，如汽车、摩托车、纺织机械、印刷、烟草、食品机械、微电机、冶金、矿山机械、锻压机床、起重设备、建筑机械、水利机械等。公司将热忱及时地为国内外用户设计、生产高质量、低价位的轴承产品。

The main products are: sand and gravel guards, rain guards, sun block, after the spoiler, sunroof block, insect guards, spare tire cover line, operating through many years of efforts, won the trust of customers, products are exported to Southeast Asia, North America, The Middle East and Europe and other countries, both at home and abroad establish its own brand.

主要产品有：砂石挡、、雨挡、太阳挡、后扰流、天窗挡、昆虫挡、备胎罩系列，通过多年的努力经营，深得广大客户的信赖，产品远销东南亚、北美、中东和欧洲等国家，在国内外树立了自己的品牌优势。

With consistent and stable quality, these products receive unanimous acclamation from the clients at home and abroad. Having passed the testing of "SGS" and "China National Safety Glass and Quartz Glass Test Center", with accompanied testing report, our products are your best choice, and we are your partner you could trust!

我司产品已通过&SGS瑞士通用集团&和&国家安全玻璃及石英玻璃检测中心&的检测，并有出示检测报告，是您更好的选择和值得信赖的長期合作伙伴！

The paper introduces coal tar processing and new technology of coal tar separation both at home and abroad and the shortcomings of domestic technology. PRO/Ⅱ was used to simulate two-column continuous distillation and was found to be a good tool to improve the technology.

介绍了国内外煤焦油加工发展的现状和煤焦油分离的新技术，阐述了我国在该领域存在的不足，并以PRO/Ⅱ为工具对煤焦油两塔式连续蒸馏进行了模拟研究。

The company product gets material from for a sky, stone Jean's jades, such as granite and marble, barn swallow stone and man white jade...etc., carve with Long Ting Long's pillar and the embankment building jade Ge, birds and beasts and person flower and grass and in the style of antique container for excel, is possessing the great reputation of "rival nature","the stone breaks surprised sky of" at home and abroad, actually is an adornment, appreciate, collect, the good product of donation.

公司产品取材于天青石、大理石、燕子石、汉白玉等名石珍玉，雕刻以龙亭龙柱、堰楼玉阁、飞禽走兽、人物花草及仿古器皿为擅长，在国内外享有&巧夺天工&、&石破惊天&之盛誉，实乃装饰、观赏、收藏、馈赠之佳品。

That competitive sports insists that "to strike ice and snow plate , to sing ice and snow play " for development strategy,creates good achievement on surpassing field at home and abroad.

竞技体育坚持以&打冰雪牌、唱冰雪戏&为发展战略，在国内外赛场上创造佳绩。20 年来，共获得奖牌2300 余枚，有1 人2 次打破1 项世界青少年速滑纪录、7 人11 次打破9 项全国纪录，9 人9 次打破6 项全国青少年纪录、30 人41次打破31 项省纪录、51 人79 次打破57 项省青少年纪录、99 人195 次打破176 项市记录、先后为省和国家培养出了全国、亚洲、世界冠军焦志敏、陈静、郭伟茹、杨光、曹桂凤、冯庆波、刘广彬、卢亚军、于凤桐、任慧、许文龙、张爽等一批优秀体育人才，他们为祖国和家乡争得了荣誉，使林城伊春走向全国、走向世界。

The company has first-class production equipment and supporting system for the import of professional high-precision automatic machinery, the production of a professional technical team and experienced engineering and maintenance staff, with many famous enterprises at home and abroad to establish a good, long-term strategic partnership relations, product line also popular with professionals certainly

公司拥有一流的生产车间设备，并配套系统的进口高精密度全自动专业机械，以专业的生产技术团队及经验丰富的工程维护人员，与国内外众多知名企业建立良好的、长期的战略合作伙伴关系，产品也深受行内专业人士的肯定

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。