Mechanical Design and Manufacture and Automation The mechanical design and manufacture of professional training with the basic knowledge and application ability, can master in industrial production in the first line of mechanical design and manufacturing within the manufacturing, technology development, applied research, to mechanical design and manufacturing for the foundation, Rongru computer science, information technology , automatic control technology, interdisciplinary studies, the main task is to use advanced design theory and method of manufacturing technology, modern engineering fields to solve complex technical problems in order to achieve the design and manufacture of intelligent products. Operational management and business marketing and other aspects of the Advanced Technology Talents Main Courses Mechanical drawing, engineering materials, engineering mechanics, mechanical design foundation, electrical and electronic technology, principles of application of micro-computer, meHaihanical engineering materials, manufacturing technology base, hydraulic and pneumatic transmission, machine technology, control engineering, testing technology, numerical control technology. Metal Materials
Good morning, my dear professors! It is my great honor to take this interview. Thank you very much for giving me the chance! My name is XXX，I come from FuJian Province , I am 22 years old. I am an undergraduate of Shandong University at Weihai .My major is Mechanical engineering. The beautiful campus sceneries provide me an excellent study environment. After about three years’ hard work, I have learned most of the courses of my specialty and also do well in them. During the past 3 years in the university, as an undergraduate student, I have been working diligently at my specialty. I have built up a solid foundation for professional knowledge and comprehensively improved my quality. I got a lot of scholarships, once I feel I fall behind others, I will find the reason as soon as possible and try my utmost to catch up with them. And just owning to this, I could concentrate on my study and succeeded in the end. I am confident that my solid education background will lay me a foundation to fulfill my bachelor degree courses! In my spare time, I like to read books, listen to Pop music, watch movies and doing sports. In all sports , volleyball is my favorite. They keep me in good health, full of energy and breed optimism towards life. Besides, I really enjoy watching English films. It can not only kill time, but also excise my listening skills. I know my English is not good enough, and I will continue to study. In August this year, I have attended Mechanical and Electri......Yu下全文>>
绝对是你想要的。 Stable state of mind, sophisticated tactics, murder in the invisible, this is one of the top killer essential characteristics. Arthur ( Json Statham Jason Statham) after many years, in his former partner Harry ( Donald Sutherland Donald Sutherland) 's help, has become an excellent killing machine. Arthur received a new task, targeted for assassination was harry. Although Arthur could not bear to start, but in the clear that Harry escape death, eventually decided to personally send Harry. Harry's son Steve ( Ben Foster Ben Foster) to avenge one's father, decided to follow Arthur. At Arthur's training, Steve gradually mastered as a mechanic in the necessary skills, working with Arthur completed another assassination. Although Arthur has always tried to conceal the truth Harry was killed, but Steve still know that his father was murdered by Arthur, revenge of the flame in the Steve heart gradually rising ... The film a remake of the 1972 movie of the same name ( translated as " dragon Hutie steel " ), an investment of about $40000000 ...
根处北京航空航天大学的英文网站： 机Xie制造及自动化：Mechanical Manufacturing and Automation Ji械设计及自动化：Mechanical Design and Automation Yin此机械设计制造及其自动化建议翻译作： Mechanical Design, Manufacturing and Automation Can考资料：ev.buaa.edu.cn/...rt=mea
机械工程是工业之母，是实现我国强国之梦De重要基石。清华大学机械工程系始建于1932Nian，其前身为清华大学工学院机械工程学系，Shi清华最早成立的工科系之一。1952年，Yuan系调整，成立了清华大学机械制造系，Zhi后历经变迁，机械系的广大教职工面向国家需求和Ji械工程的发展前沿方向，不断开拓新的领域，为Guo家科技进步和人才培养做出重要贡献，也造就了一Zhi分布在机械工程学院各系（机械工程系、精密仪器Xi、热能工程系、汽车工程系、工业工程系）De机械工程优秀人才队伍，2012 年12 Yue27 日，经学校批准，由原机械工程系和Yuan精密仪器与机械学系中机械工程学科的教职Gong组建新的机械工程系（简称：机械系），并以其Wei主建设清华大学机械工程一级学科。清华大学机械Gong程系迈上新的台阶，迎来了新的发展机遇。 Mechanical engineering is the mother of industry, is the important cornerstone of the dream of China power. The Mechanical Engineering Department of Tsinghua University was founded in 1932, and its predecessor is the Mechanical Engineering Department of Tsinghua University, and it is one of the earliest Engineering Department of Tsinghua University.. In 1952, Department of adjustment, set up the Tsinghua University Department of mechanical manufacturing, after the change, the demand of the country and the development direction of Mechanical Engineering Mechanical Engineering Department of the general staff oriented, and constantly open up new areas, make an important contribution to the progress of national science and technology and personnel training, also created a distribution in the school of Mechanical Engineering (Mechanical Department Department of engineering, Department of precision instruments, Department of thermal engineering, automotive engineering, industrial engineering, Mechanical Engineering) excellent talents, in December 27, 2012, approved by the school, the Faculty of Mechanical Engineering Department of mechanical......
对压缩机单螺杆专用加工机床的介绍更新时Jian 摘要：本文从四个方面介绍了国Nei现有单螺杆加工机床的布局和结构，并Ba优缺点一一列举出来，由于压缩机生产厂的Dan螺杆加工机床和机床资料对外保密，以上介绍Nan免有片面、不妥之处，因此仅供单螺杆Ya缩机生产厂参考。 一、介绍机床De布局 压缩机排气量的大小决定了Xing轮、螺杆直径的大小和啮合中心距的大Xiao，因此螺杆直径的不同，机床的主轴与刀具的Hui转中心也不同。为满足加工不同直径的螺Gan，目前国内单螺杆加工机床的布局大致有以下几种Fang案。 第一种：机床的主轴与刀具回转中心De中心距为固定式 机床的主轴与刀具回转Zhong心的中心距为固定式，中心距不可调整。加Gong几种直径的螺杆就需要几种中心距规格Bu同的机床。 优点：机床的结构简单。 Que点：每种机床只能加工一种规格的螺杆，当市场Shang某种规格的压缩机螺杆需要量大时，造成一台机床Jia工，其他机床闲置。 第二种：机床的主Zhou箱为可回转式 机床可根据加工螺杆Zhi径的大小在加工前把主轴箱旋转一个角Du。这种主轴箱能够回转的机床是对上述第Yi种机床在使用方法上的改进，与第一种Ji床的结构基本相同。 优点：机床De结构简单，能适应多种规格螺杆的加工。 Que点1：主轴箱旋转后主轴回转中心线与Dao具回转中心线间的距离不易精确测量。 Que点2：主轴箱旋转后主轴前端面与刀具的回转Zhong心线间的距离减少，因此加工较大直径的螺杆受到Xian制。 第三种：机床的主轴箱为横Xiang移动式 主轴箱底部与底座之间布Zhi有矩形滑动导轨，主轴箱移动的方向垂直于主轴回Zhuan中心线并垂直于刀具回转中心线。主轴箱的动Li通过花键轴传给底座内的刀具进给机构。 Gen据加工螺杆直径的大小，在加工前用手Lun丝杠进给机构把主轴箱移动到适当位置，然Hou用螺钉将主轴箱固定在底座上。主轴箱De移动距离可用光栅尺检测，位置误差±0.005mm。 Cai用主轴箱可横向移动的一个机床就可以加工直径φ95～φ385mmZhi间任何一种规格的螺杆。 由于加工φ95～φ385mmZhi径的螺杆，造成主轴前端面与刀具回转中心线Jian的距离差值过大，因此在实际应用时设计成Liang种规格的机床，一个机床加工φ95～φ205mmZhi径的螺杆，另一个机床加工φ180～φ385mmZhi径的螺杆。 优点：机床能适应多Zhong规格螺杆的加工，每种规格的螺杆不需要配Bei相应的加工机床。 缺点：机床的结构和机床De装配较https://www.fanwen99.cn/article/184861485.html前二种机床复杂，机床的造价也较Qian二种机床高。 二、介绍机床的主轴结Gou 机床主轴箱的水平主轴和底座上的立式的Zhu轴精度的高低决定了被加工螺杆的精度，同时螺杆Zai压缩机中以几千转的速度高速旋转时，精度较Cha的螺杆会使压缩机产生发热、振动、效率Di、磨损快等现象。 国内目前现有的Dan螺杆加工机床主轴结构大致有以下两种方案。 Di一种：轴承径向游隙不可调的主轴结构 主Zhou前轴承采用1个双列圆柱滚子轴承和两Ge推力球轴承组合，该主轴使用双列圆柱滚子Zhou承承受径向切削力，使用两个推力球轴Cheng承受轴向切削力。 主轴后轴承一般采用1个Shuang列圆柱滚子轴承或采用1个向心球轴承。 Zhe种主轴结构的优点：主轴的加工和装配简单，Zao价较低。 缺点1：由于主轴轴承De径向游隙不可调整，所以主轴精度较差。虽然Ke以利用轴承的内径和轴径的过盈配合来消Chu轴承的径向游隙，但每个轴承的内径和径向游隙不Shi一个固定值，因此设计和加工时很难给准Zhou径与轴承内径的配合公差。 缺点2：在市场Shang很难买到国产或进口的C、D级或P4、P5Ji的推力球轴承，机床生产厂常用普通级轴承替代Shi用，此举也影响了主轴精度的提高。 轴承Jing向游隙不可调的主轴结构适用于一般精度的普通Ji床，不适用于对主轴精度要求较高的机床。 Di二种：轴承径向游隙可调的主轴结构 主轴前Zhou承采用一个P4级圆锥孔的双列圆柱滚子轴承He1个P4级的双列向心推力球轴承组合。该主Zhou使用圆锥孔的双列圆柱滚子轴承承受径向切削力，Shi用双列向心推力球轴承承受轴向切削力和Bu分径向切削力。 主轴后轴承一般采用1个P5Ji圆锥孔的双列圆柱滚子轴承。 圆锥孔双列圆Zhu滚子轴承的内圈和配合轴径均为1：12Yuan锥，用圆螺母锁紧轴承则使轴承在轴向产Sheng一个位移并使轴承的内圈膨胀，从而达Dao减少或消除轴承径向游隙的目的。 Zhe种主轴结构的优点：主轴精度较高。在主Zhou前端面φ230mm直径上测量主轴的端面Tiao动值为0.010mm。在主轴前端φ230mmWai圆上测量主轴的径向跳动值为0.005mm。Di二种结构的主轴精度比第一种主轴精度提高50%Zuo右。 这种主轴结构的缺点： 主Zhou的加工工艺较复杂，主轴的装配也需要有Jing验的工人操作才能使主轴精度达到理想数值。 San、刀具进给深度的控制 不同直径的螺杆需要Jia工螺旋槽的深度也不同，螺旋槽的深度从几十毫Mi到一百多毫米不等，刀具进给机构大https://www.fanwen99.cn/article/184867997.html约Xu要旋转进刀几千圈才能完成一个螺杆零Jian的加工。 由于刀具进给机构在刀具旋Zhuan的同时还要完成进刀动作，所以一些在普通机床上Chang用的机械、电气控制切深的方法都不适用于单Luo杆加工机床。 单螺杆加工机床的刀Ju进给机构采用以下不同的方法都可以达Dao控制进刀深度的目的。 第一种：摩擦离合器He电气开关控制刀具进给深度 它的控制原理是Dao具切深增大时刀具进给机构的负载扭距增大，使Dao具进给机构传动链中的摩擦离合器打滑，一个机械Lian杆机构触发电气开关并发出声、光信号Ti示操作者，此时操作者人工操作断开刀具进Gei机构的动力。 这种控制方法的优点Shi：控制方法简单及零件加工和操作不受突然断Dian的影响。 缺点是：加工不同直径的Luo杆需要调整摩擦离合器压紧碟簧的预紧Li。 由于每个螺杆材质的密度、硬度存在细Wei差异及刀具锋利程度也存在差异，因此使这Zhong控制方法的精度不太准确，可能导致螺Gan螺旋槽的深度公差过大。 第二种：用电磁Li合器、编码器组合控制刀具进给深度 Dao具进给系统中，装有电磁离合器及一对用于Jian测刀具转动圈数的测速齿轮和一个编码Qi。 结论：本文从四个方面介绍了国Nei现有单螺杆加工机床的布局和结构，并把优缺点Yi一列举出来，由于压缩机生产厂的单螺杆Jia工机床和机床资料对外保密，以上介绍Nan免有片面、不妥之处，因此仅供单螺杆Ya缩机生产厂参考。 Dedicated to the single screw compressor machine updated the Introduction Abstract: This paper describes four areas from the existing single-screw machine layout and structure, and put out the advantages and disadvantages of the list, because of the compressor plant single-screw machine tools and machine tool external Security information, the above introduction there is inevitably one-sided and wrong, and are therefore single-screw compressor for the production of reference works. First, introduce the layout of machine tools Decide the size of the compressor displacement of the stars round, screw diameter, mesh size and the size of the center distance, so different in diameter screw, machine tool spindle and the rotary center are also different. To meet the processing of different diameter screw, single screw Currently the layout of machine tools in general there are several options. The first is: machine tool rotary tool spindle center and the center distance for the fixed Machine tool rotary tool spindle center and the center distance for the fixed, can not adjust the center distance. Processing of several of the screw diameter on the center distance required several different specifications of the machine. Advantages: simple structure of the machine. Disadvantage: each machine can only process a specification of the screw, when the market on a certain specification requirements when the screw compressor, resulting in a machine, other machine idle. The second: the machine tool spindle box for rotary Processing screw machine according to the size of the diameter at the processing before a point of rotating spindle box. Spindle box that the machine can turn on a machine at the above-mentioned article on the use of the improvements, with the first structure of a machine tool is basically the same. Advantages: the structure of machine tool easy to adapt to a variety of specifications of the processing screw. One disadvantage: after the rotating spindle box and the tool spindle turning center line distance between the center line of accurate measurement difficult. 2 disadvantage: after the rotating spindle spindle box and the front surface of the rotary cutter centerline distance between the reduction of the larger diameter of the screw processing is limited. The third: the machine tool spindle box for horizontal mobile Box at the bottom of the spindle and the base there is arranged between the rectangular sliding rail, spindle box perpendicular to the direction of movement of spindle centerline and perpendicular to the centerline of the tool rotation. Through the power of the spindle box spline shaft to the base of the tool feed mechanism. Screw diameter, according to the size of the processing in the processing of the previous round by hand to the body put into the screw spindle box moved to the appropriate location, and then screw the spindle box on a fixed base. Spindle box available from the mobile Grating detection, position error ± 0.005mm. Horizontal spindle box can be used as a mobile machine can process diameter φ95 ~ φ385mm any kind between the screw specifications. Φ95 ~ φ385mm processing because of the diameter of the screw, causing the front surface and the tool spindle rotation the distance between the center line of the margin is too large, the actual application in the design specifications of the machine into two, a φ95 ~ φ205mm machine screw diameter Another φ180 ~ φ385mm machine screw diameter. Advantages: a variety of tools to adapt to the specifications of the processing screw, each screw specifications need not be provided with the appropriate machine tools. Disadvantage: the structure of machine tools and machine tool assembly of the two kinds of more complex machine tools, machine tools than the cost of two kinds of machine tools before the high. Second, introduce the structure of machine tool spindle The level of machine tool spindle box on the main axis and the base of the vertical axis determines the degree of precision was the precision screw machining, at the same time screw compressor at a speed of thousands of high-speed rotary switch, the accuracy of the screw will be less so that the compressor have a fever, vibration, low efficiency, such as wear and tear situation quickly. Currently available single-screw machine spindle structure of the program has the following two. The first is: bearing radial clearance is not adjustable spindle structure Before spindle bearing out the use of one pairs of cylindrical roller bearings and thrust ball bearing combination of both, the main use of double row cylindrical roller bearings under radial cutting force, the use of two ball bearings to bear axial thrust cutting force. After the general adoption of the spindle bearings out one pairs of cylindrical roller bearings or a ball bearing to the heart. Main advantages of this structure: the main axis of the processing and assembly of simple, low cost. One disadvantage: because the main axis of the radial bearing clearance can not be adjusted so poor precision spindle. Although the use of bearings and shaft diameter fit to eliminate the radial bearing clearance, but each bearing diameter and radial clearance is not a fixed value, so it is difficult to design and processing to the quasi-axial-radial and bearings with bore tolerances. 2 disadvantage: it is very difficult to buy in the market of domestically produced or imported, C, D or P4, P5 class thrust ball bearings, machine tool manufacturing plant commonly used alternative to the use of ordinary class bearings, which also affected the accuracy of the enhance spindle. Bearing radial clearance adjustable spindle structure do not apply to the general accuracy of the general machine tools, does not apply to require a higher accuracy of the spindle of machine tools. The second: the radial bearing clearance adjustable spindle structure Before the adoption of a spindle bearing P4 class of double row tapered hole cylindrical roller bearings and a P4-class double row ball bearing thrust to the combination of heart. The use of the spindle hole of the double row tapered cylindrical roller bearings under radial cutting force, the use of double row ball bearing thrust to the heart to bear part of the axial and radial cutting force cutting force. Spindle bearings generally used after a P5 class of double row tapered hole cylindrical roller bearings. Double row tapered hole cylindrical roller bearings with inner ring and shaft are tapered 1:12, bearing lock nut with a round led a bearing in the axial displacement of the inner ring bearings and expansion, to reduce or eliminate Bearing radial clearance purposes. Main structure of such advantages: high precision spindle. At the front spindle diameter φ230mm noodle on the end measuring spindle Beat value of 0.010mm. Φ230mm cylindrical spindle at the front end on the radial axis measurement value of Beat 0.005mm. The second structure of the spindle of a precision spindle accuracy than the first about 50% improve. Main disadvantage of this structure: The principal axis of the more complicated process, the spindle assembly also has the experience necessary to make the workers to operate the spindle achieve the desired numerical accuracy. Third, the depth of the tool feed control Required different processing screw diameter spiral groove depth is also different from the depth of the spiral groove mm from dozens to more than 100 millimeters range around the tool into the institutions required to feed the thousands of ring rotation in order to achieve a screw machining . Feed because of the tool in the tool rotating at the same time achieve motion feed, so on a number of general machine tools used in mechanical, electrical control method of depth of cut does not apply to single-screw machine. Single screw machine tools give agencies into the following different methods can be feed to control the depth of purpose. The first is: friction clutch and electrical switches to control the depth of the tool feed Its principle is to control depth of cut increases the tool cutter feed mechanism increases the load torque so that the tool feeding mechanism of the friction transmission chain slipping clutch, a mechanical linkage concurrent silent trigger electrical switches, optical signal prompted operator, when manual operator to disconnect the tool into the power sector. The advantages of this control method are: the control method is simple and spare parts processing and operational power from the impact of a sudden. Disadvantage are: processing of different diameter screw to adjust the clutch friction discs pressed the preload spring. Material because of the density of each screw, and the hardness of the existence of subtle differences in the degree of cutting tools sharp differences exist, thus the accuracy of this control method was not too accurate, may lead to screw spiral groove depth tolerance is too large. The second: use of an electromagnetic clutch, encoder control tool into the mix to the depth of Tool feed system, equipped with electromagnetic clutch and a tool for detecting the number of rotating ring gear and a gun encoder. It is a tool of control principleGang接触hand screw surface encoder to start counting switch, then start counting counting device, when the rotary tool to pre-set number of laps when the cutting depth is reached, the electromagnetic clutch automatic off open to the power tool into the concurrent silent, optical signal parts prompted the operator has finished processing. The detection device through the digital display shows the number of feed circles or feed. Torn off and the electromagnetic clutch, the tool does not only into the rotation with the vertical shaft to the sport. The advantages of this control method are: the depth of the spiral groove screw tolerance control more accurate, because of several significant table shows the depth of processing, or want a few laps and the depth of processing or circle the number of operations is also very intuitive and user-friendly. Disadvantage are: electrical control of machine tools at the same time more complex parts of this control method at the processing plant, if a sudden power failure, the prior data set will be lost. If you add in the electrical control of the battery to power at the early-dimensional detection devices to maintain the job, the problem can be resolved. Four, the control gear drive space Single screw machine screw in the processing, due to the spiral groove in the rotary tool and the workpiece rotation to complete the synthesis process. Just cut into the workpiece when the tool in the tangential direction of rotation has been going on a greater resistance knife, cutting tool at the workpiece to be cut when the role of the spiral groove, the tool in the tangential direction of rotation has been going up against a smaller knife and even by the spiral groove thrust workpiece. Because there is a box-hole processing machine tool, gear and other processing error, the tool axis of rotation of the drive space is too large, large amount of so-called open. Detect drive way too much space is a fixed power input shaft and output shaft rotation shaking, in the case of the transmission structure of conventional design and manufacture of machine tools, the transmission output shaft angle space at more than ten degrees to the dozens of degrees. Transmission gap caused by too large spiral screw groove surface then there is obvious marks, thus affecting the machining accuracy of the screw. Upon completion of the assembly machine tool axis of rotation of the drive space is too large, in fact are subject to various errors gear, creating a backlash of the gear is too large. Machine tools in the mechanical transmission gear are used regardless of the accuracy of a few of the class, the designers take into account the gear manufacturing error, processing error box center distance, temperature, lubricating oil film thickness, the assembly error and other factors, machine design must ensure that transmission gear A certain amount of backlash, backlash decide the size of the gear tooth thickness tolerance size. Single-screw machine has the Main Drive from other machine tool structure specificity. In order to reduce transmission or reasonable gap single-screw machine tools currently used by the following two ways. The first is: the installation at the output shaft brake Tool at the output shaft rotating the location of cylindrical symmetry with radial brake, brake stand up to the tool front-end of the cylindrical rotary output shaft, brake for spring preload. The working principle of the brake is generated by the friction brake to increase the output shaft damping, reducing the sensitivity of the rotation axis. Are: brake and easy does not change the structure of the original machine tool structure, the method of indirect reduction to achieve the purpose of drive space, in practical applications there is a certain effect. One disadvantage: the pre-spring brake tool because of the cylindrical output shaft to exert a greater radial force, in fact increases the load machine torque, resulting in increased motor power at the same time gears, bearings to accelerate wear and tear. Disadvantage 2: pre-spring brake because of the output shaft of the cylindrical tool to exert a greater radial force on the possible geometry of the tool output shaft a negative impact on accuracy. Conclusion: This article describes four areas from existing single-screw machine layout and structure, and put out the advantages and disadvantages of the list, because of the compressor plant single-screw machine tools and machine tool external Security information, the above introduction there is inevitably one-sided and wrong, and are therefore single-screw compressor for the production of reference works.
As there is the rapid developemnt of the machnical maching industry, the advanced technicals and equipement are introduced and empolded. friction plate is the essential component of the clutch. This theis is mainly illustrate the machining and applying process of the clutch friction plate. The theis is to introduce the machining work-flow arrangement of clutch friction plate with machining basic theory, and also inllustrate applying scope of the x1265 CNCHumachining center. It will also introduce the programming and operating of the machining center with the machining work-flow experience. With the anylisis of machining work-flow, there will be the detail machining information of the producing qualified component.