皮带机液压拉紧装置的设计【含CAD高清图纸和说明书】
【温馨提示】 dwg后缀的文件为CAD图,可编辑,无水印,高清图,压缩包内文档可直接点开预览,需要原稿请自助充值下载,请见压缩包内的文件及预览,所见才能所得,请细心查看有疑问可以咨询QQ:414951605或1304139763
徐州工程学院毕业设计(论文)任务书 机电工程 学院 机械设计制造及其自动化 专业设计(论文)题目 皮带机液压拉紧装置的设计与计算 学 生 姓 名 陈娟 班 级 04机本(4) 起 止 日 期 2008.2.25-2008.6.2 指 导 教 师 杨根喜 教研室主任 李志 发任务书日期 2008年 2月 25 日1.毕业设计的背景: 带式输送机特别是上运机是当代最为得力的输送设备之一,随着国民经济的不断发展,多种类型的工件传送机广泛的运用于冶金、矿山、水泥、码头、化工、粮食等行业的各种场合。同时在各种场合对不同的工况所使用的工件传输机也不尽相同。拉紧装置是煤矿井下用带式输送机不可缺少的重要组成部分。拉紧装置主要有螺旋拉紧,重力式拉紧,钢丝绳绞车式拉紧和液压拉紧。其中液压拉紧装置能克服其他拉紧装置方式的不足之处,它可以直接关系到带式输送机的安全运行及使用寿命。以往煤矿井下带式输送机一般均采用绞车拉紧或重锤拉紧,然而近年来,人们已发现上述两种拉紧装置对带式输送机正常运行均会产生一些技术和经济方面问题。所以本设计采用液压拉紧装置实现对整个设备的优化。2.毕业设计(论文)的内容和要求: 内容:1. 皮带机液压拉紧系统原理2. 皮带机传动系统的运动,力学分析3. 皮带机液压拉紧系统设计与计算4. 液压拉紧装置的关键零部件的结构设计与计算要求:1. 说明书要求:内容详实,系统性强,具有较高的综合运用知识的能力。2. 图纸要求:尺寸准确,结构合理,技术要求全面。3.主要参考文献: 1 中国矿业大学.矿山运输机械. 中国矿业大学出版社,2003.12 龚湘义. 机械设计课程设计指导书. 第二版.高等教育出版社, 2004.43 路甬祥. 液压气动技术手册. 机械工业出版社, 2002.14 邱宣怀.机械设计.第四版. 高等教育出版社, 2003.45 张利平. 液压传动系统及设计.化学工业出版社, 2005.86 张钺.新式带式输送机设计手册 .冶金工业出版社,2001. 27 许福玲. 陈尧明. 液压与气压传动. 机械工业出版社. 2006.58 液压技术手册.辽宁科技出版社. 2004.59 张利平.液压气动技术实用问答. 化学工业出版社.2007.94.毕业设计(论文)进度计划(以周为单位):起 止 日 期工 作 内 容备 注第一周第二周第三周第四周第五周第六周第七周第八周第九周第十周第十一周第十二周第十三周第十四周第十五周第十六周调研,查资料上运机传动系统的方案设计上运机传动系统的运动,力学分析拉紧装置液压系统设计拉紧装置液压系统参数计算液压拉紧装置的关键零部件的计算液压拉紧装置的关键零部件的结构设计辅助零部件的设计与计算绘图绘图,写说明书答辩教研室审查意见: 室主任 年 月 日学院审查意见: 教学院长 年 月 日文档包括:说明书一份,34页,23000字左右.英文翻译一份.任务书一份.开题报告一份.图纸共4张:A0-皮带机整体装配图.dwgA0-液压拉紧装置.dwgA1-齿轮液压泵装配图.dwgA3-液压缸装配图.dwg徐州工程学院毕业设计(论文)开题报告课 题 名 称:皮带机液压拉紧装置的设计与计算 学 生 姓 名: 陈娟 学号: 06 指 导 教 师: 杨根喜 职称:高级工程师 所 在 学 院: 机电工程学院 专 业 名 称: 机械设计制造及其自动化 徐州工程学院 2008年 6 月 2 日说 明1根据徐州工程学院毕业设计(论文)管理规定,学生必须撰写毕业设计(论文)开题报告,由指导教师签署意见、教研室审查,学院教学院长批准后实施。2开题报告是毕业设计(论文)答辩委员会对学生答辩资格审查的依据材料之一。学生应当在毕业设计(论文)工作前期内完成,开题报告不合格者不得参加答辩。3毕业设计开题报告各项内容要实事求是,逐条认真填写。其中的文字表达要明确、严谨,语言通顺,外来语要同时用原文和中文表达。第一次出现缩写词,须注出全称。4本报告中,由学生本人撰写的对课题和研究工作的分析及描述,没有经过整理归纳,缺乏个人见解仅仅从网上下载材料拼凑而成的开题报告按不合格论。5. 课题类型填:工程设计类;理论研究类;应用(实验)研究类;软件设计类;其它。6、课题来源填:教师科研;社会生产实践;教学;其它课题名称皮带机液压拉紧装置的设计与计算课题来源企业现场课题类型工程设计选题的背景及意义带式输送机特别是上运机是当代最为得力的输送设备之一,随着国民经济的不断发展,多种类型的工件传送机广泛的运用于冶金、矿山、水泥、码头、化工、粮食等行业的各种场合。同时在各种场合对不同的工况所使用的工件传输机也不尽相同。拉紧装置是煤矿井下用带式输送机不可缺少的重要组成部分。拉紧装置主要有螺旋拉紧,重力式拉紧,钢丝绳绞车式拉紧和液压拉紧。其中液压拉紧装置能克服其他拉紧装置方式的不足之处,它可以直接关系到带式输送机的安全运行及使用寿命。以往煤矿井下带式输送机一般均采用绞车拉紧或重锤拉紧,然而近年来,人们已发现上述两种拉紧装置对带式输送机正常运行均会产生一些技术和经济方面问题。所以本设计采用液压拉紧装置实现对整个设备的优化。研究内容拟解决的主要问题(1) 带式输送机在启动时,其下分支胶带会突然松弛伸长,此时拉紧装置能及时张紧胶带以补偿胶带的伸长量,避免胶带在传动滚筒上打滑。(2) 煤矿井下环境恶劣,使得胶带与传动滚筒之间的摩擦系数变化相差很大,加之输送机的载荷变化也较大,所以要求拉紧装置反应灵敏、响应及时,工作可靠性较高且能方便地调整拉紧力。研究方法技术路线皮带机液压拉紧系统原理皮带机传动系统的运动及力学计算皮带机液压拉紧系统设计与计算液压拉紧装置的关键零部件的结构设计与计算研究的总体安排和进度计划第一周第二周: 调研,查资料第三周: 上运机传动系统的方案设计第四周:上运机传动系统的运动,力学分析第五周: 拉紧装置液压系统设计第六周: 拉紧装置液压系统参数计算第七周第八周: 液压拉紧装置的关键零部件的计算第九周第十周: 液压拉紧装置的关键零部件的结构设计第十一周第十二周:辅助零部件的设计与计算第十三周第十五周: 绘图,写说明书第十六周: 答辩主要参考文献1 中国矿业大学.矿山运输机械. 中国矿业大学出版社,2003.12 龚湘义. 机械设计课程设计指导书. 第二版.高等教育出版社, 2004.43 路甬祥. 液压气动技术手册. 机械工业出版社, 2002.14 邱宣怀.机械设计.第四版. 高等教育出版社, 2003.45 张利平. 液压传动系统及设计.化学工业出版社, 2005.86 张钺.新式带式输送机设计手册 .冶金工业出版社,2001. 27 许福玲. 陈尧明. 液压与气压传动. 机械工业出版社. 2006.58 液压技术手册.辽宁科技出版社. 2004.59 张利平.液压气动技术实用问答. 化学工业出版社.2007.9指导教师意 见 指导教师签名: 年 月 日 教研室意见学院意见教研室主任签名:年 月 日 教学院长签名: 年 月 日徐 州 工 程 学 院 毕 业 设 计 (论 文 ) I 摘要 皮带机是一种运送物料的运输机械,它广泛地被用于矿山,码头,工厂等各种场合, 但是不同的场合对皮带机的结构的要求是不同的,本设计是以矿山运输为背景,对皮带 机的结构进行了设计和计算,本设计先对皮带机传动系统的运动进行了力学分析。对皮 带机的保养与维护进行了详细的说明,在拉紧装置的设计中,为了对设备进行优化,弥 补其他拉紧装置带来的不足,本设计采用液压拉紧装置对系统进行了拉紧,同时对其他 辅助原件也做了必要的计算和选择。 关键词 皮带机;输送带;液压拉紧 徐 州 工 程 学 院 毕 业 设 计 (论 文 ) II Abstract Belt- machine is a kind of machine which is used to transport the goods ,it is widely used in the place of mine,dock,factory and so on ,but they request different structures in different places. This article is on the ground of mine .and it briefly devises and computes the structure of Belt- machine .first,this article analyses the driving system of Belt- machine .and then gives the brief maintenance and maintain of how to employ the belt-machine .in the design of tense equipment , in order to better the equipment and make up the deficiency of other equipments .here we chose the hydraulic system , and the same time ,this article also gives the compute and chose of others assistant elements. Keywords belt-machine conveyer belt hydraulic tension system 徐 州 工 程 学 院 毕 业 设 计 (论 文 ) 1 目 录 1 绪论 .1 1.1 背景介绍 .1 1.2 带式输送机的分类 .1 1.3 各种带式输送机的特点 .1 1.4 带式输送机的发展状况 .2 1.5 带式输送机的结构和布置形式 .3 1.5.1 带式输送机的结构 .3 1.5.2 布置方式 .4 1.6 带式输送机拉紧装置的设计要求 .4 1.6.1 设计方案 .4 1.6.2 主要技术 特点 .5 1.6.3 应用效果 .5 2 皮带机的设计与计算 .6 2.1 胶带运动阻力的计算 .6 2.2 胶带张力的计算 .7 2.3 牵引力及功率的计算 .9 2.4 皮带机常见故障的原因及处理方法 .9 2.4.1.皮带运输机皮带跑偏的处理 9 2.5 皮带机的安全使用及保养 .10 2.5.1 皮带机的安全使用 10 2.5.2 皮带机的保养 11 3 液压拉紧装置的设计和计算 .12 3.1 拉紧装置的类型 .12 3.2 液压拉紧装置的特点 .12 3.3 液压拉紧装置的设计计算 .13 3.3.1 系统的工作原理 .13 3.3.2 参数设定及工况分析 .14 3.3.3 液压回路设计和工作过程分析 .14 3.3.4 各元件的确定 .15 3.3.5 液压油的确定 .16 3.3.6 液压泵的选择和计算 .18 3.3.7 电动机的确定 .18 3.3.8 各种阀类的选择 .19 3.3.9 管路的确定 .19 3.3.10 液压系统中的压力损失验算 .20 3.4 系统基本回路 .23 3.5 主要部件的设计计算及强度校核 .25 3.5.1 油缸后支座的设计及强度校核 .25 3.5.2 液压缸活塞上的耳环的设计及强度计算 .26 3.5.3 销轴类的强度校核及结构设计 .27 徐 州 工 程 学 院 毕 业 设 计 (论 文 ) 2 3.5.4 联轴器键的校核 .27 3.5.5 焊缝的强度校核 .27 3.6 液压缸低速爬行的现象的原因及分析 .28 3.6.1 液压缸低速爬行的现象 28 3.6.2 液压缸爬行现象的分析 28 3.6.3 液压缸爬行现象的解决办法 29 3.7 管接头处泄漏的预防 .29 3.8 管路预安装 .30 3.8.1 管路简介 30 3.8.2 管路布置要求 30 3.8.3 确定管子长度 30 3.8.4 管子切断 31 3.8.5 管子弯曲 31 3.8.6 管子与接头焊接 31 3.8.7 管路安装 31 结论 .32 致谢 .33 参考文献 .34 附录 .35 附录 1.35 附录 2.44 徐州工程学院毕业设计(论文)附录附录1Numerical control technology and equiping development trend and countermeasureEquip the engineering level, level of determining the whole national economy of the modernized degree and modernized degree of industry, numerical control technology is it develop new developing new high-tech industry and most advanced industry to equip (such as information technology and his industry, biotechnology and his industry, aviation, spaceflight,etc. national defense industry industry) last technology and getting more basic most equipment. Marx has ever said the differences of different economic times, do not lie in what is produced , and lie in how to produce, produce with some means of labor . Manufacturing technology and equiping the most basic means of production that are that the mankind produced the activity, and numerical control technology is nowadays advanced manufacturing technology and equips the most central technology. Nowadays the manufacturing industry all around the world adopts numerical control technology extensively, in order to improve manufacturing capacity and level, improve the adaptive capacity and competitive power to the changeable market of the trends. In addition every industrially developed country in the world also classifies the technology and numerical control equipment of numerical control as the strategic materials of the country, not merely take the great measure to develop ones own numerical control technology and industry, and implement blockading and restrictive policy to our country in view of high-grade, precision and advanced key technology of numerical control and equiping. In a word, develop the advanced manufacturing technology taking numerical control technology as the core and already become every world developed country and accelerate economic development in a more cost-effective manner, important way to improve the overall national strength and national position. Numerical control technology is the technology controlled to mechanical movement and working course with digital information, integrated products of electromechanics that the numerical control equipment is the new technology represented by numerical control technology forms to the manufacture industry of the tradition and infiltration of the new developing manufacturing industry, namely the so-called digitization is equipped, its technological range covers a lot of fields:(1)Mechanical manufacturing technology;(2)Information processing , processing , transmission technology;(3)Automatic control technology;(4)Servo drive technology;(5)Technology of the sensor ;(6)Software engineering ,etc. Development trend of a numerical control technology The application of numerical control technology has not only brought the revolutionary change to manufacturing industry of the tradition, make the manufacturing industry become the industrialized symbol , and with the constant development of numerical control technology and enlargement of the application, the development of some important trades (IT , automobile , light industry , medical treatment ,etc. ) to the national economy and the peoples livelihood of his plays a more and more important role, because the digitization that these trades needed to equip has already been the main trend of modern development. Numerical control technology in the world at present and equiping the development trend to see, there is the following several respect 1- 4 in its main research focus. 1.A high-speed , high finish machining technology and new trend equipped The efficiency, quality are subjavanufacturing technology. High-speed, high finish machining technology can raise the efficiency greatly , improve the quality and grade of the products, shorten production cycle and improve the market competitive power. Japan carries the technological research association first to classify it as one of the 5 great modern manufacturing technologies for this, learn (CIRP ) to confirm it as the centre in the 21st century and study one of the directions in international production engineering. In the field of car industry, produce one second when beat such as production of 300,000 / vehicle per year, and many variety process it is car that equip key problem that must be solved one of; In the fields of aviation and aerospace industry, spare parts of its processing are mostly the thin wall and thin muscle, rigidity is very bad, the material is aluminium or aluminium alloy, only in a situation that cut the speed and cut strength very small high, could process these muscles , walls . Adopt large-scale whole aluminium alloy method that blank pay empty make the wing recently, such large-scale parts as the fuselage ,etc. come to substitute a lot of parts to assemble through numerous rivet , screw and other connection way, make the intensity , rigidity and dependability of the component improved. All these, to processing and equiping the demand which has proposed high-speed, high precise and high flexibility. According to EMO2001 exhibition situation, high-speed machining center is it give speed can reach 80m/min is even high , air transport competent speed can up to 100m/min to be about to enter. A lot of automobile factories in the world at present, including Shanghai General Motors Corporation of our country, have already adopted and substituted and made the lathe up with the production line part that the high-speed machining center makes up. HyperMach lathe of U.S.A. CINCINNATI Company enters to nearly biggest 60m/min of speed, it is 100m/min to be fast, the acceleration reaches 2g, the rotational speed of the main shaft has already reached 60000r/min. Processing a thin wall of plane parts, spend 30min only, and same part general at a high speed milling machine process and take 3h, the ordinary milling machine is being processed to need 8h; The speed and acceleration of main shaft of dual main shaft lathes of Germany DMG Company are up to 12* separately1000r/mm and 1g. In machining accuracy, the past 10 years, ordinary progression accuse of machining accuracy of lathe bring 5m up to from 10m already, accurate grades of machining center from 3- 5m, rise to 1-1.5m, and ultraprecision machining accuracy is it enter nanometer grade to begin already (0.01m). In dependability, MTBF value of the foreign numerical control device has already reached above 6000h, MTBF value of the servo system reaches above 30000h, demonstrate very high dependability . In order to realize high-speed, high finish machining, if the part of function related to it is electric main shaft, straight line electrical machinery get fast development, the application is expanded further. 1.2 Link and process and compound to process the fast development of the lathe in 5 axes Adopt 5 axles to link the processing of the three-dimensional curved surface part, can cut with the best geometry form of the cutter , not only highly polished, but also efficiency improves by a large margin . It is generally acknowledged, the efficiency of an 5 axle gear beds can equal 23 axle gear beds , is it wait for to use the cubic nitrogen boron the milling cutter of ultra hard material is milled and pared at a high speed while quenching the hard steel part, 5 axles link and process 3 constant axles to link and process and give play to higher benefit. Because such reasons as complicated that 5 axles link the numerical control system , host computer structure that but go over, it is several times higher that its price links the numerical control lathe than 3 axles , in addition the technological degree of difficulty of programming is relatively great, have restricted the development of 5 axle gear beds. At present because of electric appearance of main shaft, is it realize 5 axle complex main shaft hair structure processed to link greatly simplify to make, it makes degree of difficulty and reducing by a large margin of the cost, the price disparity of the numerical control system shrinks. So promoted 5 axle gear beds of head of complex main shaft and compound to process the development of the lathe (process the lathe including 5). At EMO2001 exhibition, new Japanese 5 of worker machine process lathe adopt complex main shaft hair, can realize the processing of 4 vertical planes and processing of the wanton angle , make 5 times process and 5 axles are processed and can be realized on the same lathe, can also realize the inclined plane and pour the processing of the hole of awls . Germany DMG Company exhibits the DMUVoution series machining center, but put and insert and put processing and 5 axles 5 times to link and process in once, can be controlled by CNC system or CAD/CAM is controlled directly or indirectly. 1.3 Become the main trend of systematic development of contemporary numerical control intelligently, openly , networkedlily The numerical control equipment in the 21st century will be sure the intelligent system, the intelligent content includes all respects in the numerical control system: It is intelligent in order to pursue the efficiency of processing and process quality, control such as the self-adaptation of the processing course, the craft parameter is produced automatically; Join the convenient one in order to improve the performance of urging and use intelligently, if feedforward control , adaptive operation , electrical machinery of parameter , discern load select models , since exactly makes etc. automatically automatically; The ones that simplified programming , simplified operating aspect are intelligent, for instance intelligent automatic programming , intelligent man-machine interface ,etc.; There are content of intelligence diagnose , intelligent monitoring , diagnosis convenient to be systematic and maintaining ,etc. Produce the existing problem for the industrialization of solving the traditional numerical control system sealing and numerical control application software. A lot of countries carry on research to the open numerical control system at present, such as NGC of U.S.A. (The Next Generation Work-Station/Machine Control), OSACA of European Community (Open System Architecture for Control within Automation Systems), OSEC (Open System Environment for Controller ) of Japan, ONC (Open Numerical Control System ) of China ,etc. The numerical control system melts to become the future way of the numerical control system open. The so-called open numerical control system is the development of the numerical control system can be on unified operation platform, face the lathe producer and end user, through changing, increasing or cutting out the structure target(numerical control function), form the seriation, and can use users specially conveniently and the technical know-how is integrated in the control system, realize the open numerical control system of different variety , different grade fast, form leading brand products with distinct distinction. System structure norm of the open numerical control system at present, communication norm , disposing norm , operation platform , numerical control systematic function storehouse and numerical control systematic function software developing ument ,etc. are the core of present research. The networked numerical control equipment is a new light spot of the fair of the internationally famous lathe in the past two years. Meeting production line , manufacture system , demand for the information integration of manufacturing company networkedly greatly of numerical control equipment, realize new manufacture mode such as quick make , fictitious enterprise , basic Entrance that the whole world make too. Some domestic and international famous numerical control lathes and systematic manufacturing companies of numerical control have all introduced relevant new concepts and protos of a machine in the past two years, if in EMO2001 exhibition, CyberProduction Center that the company exhibits of mountain rugged campstool gram in Japan (Mazak ) (intellectual central production control unit, abbreviated as CPC); The lathe company of Japanese big Wei (Okuma ) exhibits IT plaza (the information technology square , is abbreviated as IT square ); Open Manufacturing Environment that the company exhibits of German Siemens (Siemens ) (open the manufacturing environment, abbreviated as OME),etc., have reflected numerical control machine tooling to the development trend of networked direction. 1.4 Pay attention to the new technical standard, normal setting-up1.4.1 Design the norm of developing about the numerical control system As noted previously, there are better commonability , flexibility , adaptability , expanding in the open numerical control system, such countries as U.S.A. , European Community and Japan ,etc. implement the strategic development plan one after another , carry on the research and formulation of the systematic norm (OMAC , OSACA , OSEC ) of numerical control of the open system structure, 3 biggest economies in the world have carried on the formulation that nearly the same science planned and standardized in a short time, have indicated a new arrival of period of change of numerical control technology. Our country started the research and formulation of standardizing the frame of ONC numerical control system of China too in 2000. 1.4.2 About the numerical control standard The numerical control standard is a kind of trend of information-based development of manufacturing industry. Information exchange among 50 years after numerical control technology was born was all because of ISO6983 standard, namely adopt G, M code describes how processes, its essential characteristic faces the processing course, obviously, he cant meet high-speed development of modern numerical control technologys needs more and more already. For this reason, studying and making a kind of new CNC system standard ISO14649 (STEP-NC) in the world, its purpose is to offer a kind of neutral mechanism not depending on the concrete system, can describe the unified data model in cycle of whole life of the products , thus realize the whole manufacture process, standardization of and even each industrial field product information. The appearance of STEP-NC may be a revolution of the technological field of the numerical control, on the development and even the whole manufacturing industry of numerical control technology, will exert a far-reaching influence. First of all, STEP-NC puts forward a kind of brand-new manufacture idea, in the traditional manufacture idea, NC processes the procedures to all concentrate on individual computer. Under the new standard, NC procedure can be dispersed on Internet, this is exactly a direction of open, networked development of numerical control technology. Secondly, STEP-NC numerical control system can also reduce and process the drawing (about 75% ) , process the procedure to work out the time (about 35% ) and process the time (about 50% ) greatly . At present, American-European countries pay much attention to the research of STEP-NC, Europe initiates IMS plan (1999.1.1- 2001.12.3) of STEP-NC. 20 CAD/CAM/CAPP/CNC users, manufacturers and academic organizations from Europe and Japan participated in this plan. STEP Tools Company of U.S.A.is a developer of the data interchange software of manufacturing industry in the global range, he has already developed the super model (Super Model ) which accuses of information exchange of machine tooling by counting, its goal is to describe all processing courses with the unified norm. Such new data interchange form has already been verified in allocating the SIEMEN , FIDIA and European OSACA-NC numerical control at present. 2 pairs of basic estimations of technology and industry development of numerical control of our country The technology of numerical control of our country started in 1958, the development course in the past 50 years can roughly be divided into 3 stages: The first stage is from 1958 to 1979, namely closed developing stage. In this stages, because technology of foreign countries blockade and basic restriction of terms of our country, the development of numerical control technology is comparatively slow. During Sixth Five-Year Plan Period , the Seventh Five-Year Plan Period of the country in second stage and earlier stage in the Eighth Five-Year Plan Period , namely introduce technology, digest and assimilate, the stage of establishing the system of production domesticization arisesing tentatively. At this stage , because of reform and opening-up and national attention , and study the improvement of the development environment and international environment, research,development and all making considerable progress in production domesticization of the products of the technology of numerical control of our country. The third stage is and during the Ninth Five-Year Plan Period on the later stage in the Eighth Five-Year Plan Period of the country, namely implement the research of industrialization, enter market competition stage. At this stage, made substantive progress in industrialization of the domestic numerical control equipment of our country. In latter stage for the Ninth Five-Year Plan , the domestic occupation rate of market of the domestic numerical control lathe is up to 50%, it is up to 10% too to mix the domestic numerical control system (popular ). Make a general survey of the development course in the past 50 years of technology of numerical control of our country, especially through tackling key problems of 4 Five-Year Plans, all in all has made following achievements. a.Have establish the foundation of the technical development of numerical control, has mastered modern numerical control technology basically. Our country has already, the numerical control host computer , basic technology of special plane and fittings grasped and driven from the numerical control system and servoly basically now, among them most technology have already possessed and commercialized the foundation developed , some technology has already, industrialization commercialized. b.Have formed the industrial base of numerical control tentatively. In tackling key problems the foundation that the achievement and some technology commercialize, set up the systematic factories of numerical control with production capacity in batches such as numerical control in Central China , numerical control of the spaceflight etc. Electrical machinery plant of Lanzhou, such factory and the first machine tool plant of Beijing , the first machine tool plant of Jinan ,etc. several numerical control host computer factories of a batch of servo systems and servo electrical machineries as the numerical control in Central China,etc. These factories have formed the numerical control industrial base of our country basically. c.Have set up a numerical control research, development , managerial talents basic team . Though has made considerable progress in research and development and industrialization of numerical control technology, but we will realize soberly, the research and development of the technology of advanced numerical control of our country, especially there is greater disparity in current situation and current demand of our country of engineering level in industrialization. Though very fast from watching the development of our country vertically, have disparity horizontally more than (compare foreign countries with ) not merely engineering level, there is disparity too in development speed in some aspects, namely the engineering level disparity between some high-grade , precision and advanced numerical control equipment has the tendency to expand . Watch from world, estimate roughly as follows about the engineering level of numerical control of our country and industrialization level. a.On the engineering level, in probably backward 10-1 years with the advan
收藏