论文封皮.doc

旋锻机机头部分结构设计与分析【5张图纸】【Word+CAD全套设计】【优秀】

收藏

压缩包内文档预览:
预览图 预览图
编号:444585    类型:共享资源    大小:13.94MB    格式:ZIP    上传时间:2015-06-28 上传人:小*** IP属地:福建
45
积分
关 键 词:
x0080 旋锻机 机头 部分 部份 结构设计 分析
资源描述:

您若下载本次文件,将获得(CAD图纸+word文档)源文件哦!

     以下为本次文件的目录及部分图纸截图              

  【需要其他机械类资料可以联系QQ97666224】    

摘  要

本课题是根据目前我国旋锻技术的发展现状而进行的数控旋锻机床的设计与研究。 由于现代科学的发展,对产品的质量提出了更高的要求。从而对机床的要求也就有的更加的要求 ,传统的加工工艺生产效率低,并且精度不能保证[1]。但是数控旋锻机采用了闭环系统,自动进行插补运算,改变了传统开环系统形式,通过电气与液压系统有效配合,大大提高了旋锻机的使用性能。现代机械制造中加工机械零件的方法很多:除切削加工外,还有铸造、锻造、焊接、冲压、挤压等,但凡属精度要求较高和表面粗糙度要求较细的零件,一般都需在机床上用切削的方法进行最终加工。机床的进步反映了一个国家的工业化进程水平。而特种数控旋锻机床作为具有先进制造技术的基础制造装备,已被广泛应用于航天、航空、能源、交通等各个领域,其加工精度、加工效率和加工能力的高低直接影响着一个国家国民经济和国防建设的发展。论文研究对象是一种德国进口并可进行旋转锻造加工的多功能特种数控机床,目前国内并无此种设备的研制和生产。本论文正是对此种机床的结构进行分析并进行主体机床结构的仿制、改进和设计。研究中应用先进设计手段辅助机床结构设计,利用SolidWork软件进行机床三维布局及造型设计,机床的设计效率和设计过程可视化程度都得到较大提高。论文研究除完成了数控旋锻机床结构的主体设计,论文中还运用有限元分析软件,对机床使用的模具进行动态受力分析。论文还对数控旋锻机床的模具和主要零部件的制造和修整做了较详细的介绍,对数控旋锻机床的检修和保养方法也做了说明。希望在借鉴和学习国外先进机床制造技术的情况下,能对国内特种机床的发展和进步提供一些资料和参考.



关键词:CNC;旋锻机;模具;有限元分析;solidwork;动力学分析


Abstract

The issue is the design and research of CNC rotary forging machine according to the current development status of swaging techniques carried out. Due to the development of modern science, the quality of the product a higher requirement. Thus some of the requirements of the machine will be more demands, low productivity of traditional processing technology, and accuracy can not be guaranteed. But CNC rotary forging machine uses a closed-loop system, automatic interpolation operation, changing the form of the traditional open-loop system, electrical and hydraulic systems through effective coordination, greatly improving the performance swaging machine. Mechanical machining methods of modern manufacturing many mechanical parts: Cutting addition, there are casting, forging, welding, stamping, extrusion, etc. Where the higher accuracy but the required surface roughness and fine parts, generally takes final processing methods on the cutting machine. Machine progress reflects the level of a country's industrialization process. The special CNC rotary forging machine as the basis for manufacturing equipment with advanced manufacturing technology, has been widely used in aerospace, aviation, energy, transportation, and its precision machining, processing efficiency and the ability to directly affect the level of a country's economy and the development of national defense construction. Thesis is a study of German imports and can be rotated forging special multifunctional CNC machine tools, there is no domestic development and production of such equipment. This paper is to analyze the structure of such a machine and copy machine body structure, improvement and design. Research in the application of advanced design tools assist machine design, the use of software tools SolidWork dimensional layout and design, machine design efficiency and process visualization have been greatly improved. In addition to the completion of the main thesis of CNC swaging machine structure design, the paper also uses finite element analysis software tools used to mold the dynamic mechanical analysis. The paper also manufacture and repair of CNC machine tools swaging dies and major components to do a more detailed introduction to CNC swaging machine repair and maintenance methods also made instructions. In the case of hope to learn from foreign advanced machine manufacturing technology, capable of national progress and development of special tools provide some information and reference


Keywords: CNC; rotary forging machine; die; finite element analysis; solidwork; kinetic analysis


目录

摘  要I

AbstractII

1绪论1

1.1概述1

1.2 数控旋锻机床的产生与发展1

1.2.1 数控旋锻机床的产生1

1.2.2数控旋锻机床的发展1

1.3数控旋锻机床的使用领域2

1.3.1 数控旋锻机床在个领域的应用2

1.3.2数控旋锻机床主要使用领域2

1.3.3 数控旋锻机加工炮管、枪管等产品3

1.3.4 异形管材4

1.4国外数控锻造技术的发展现状与发展趋势4

1.4.1锻造技术的发展现状4

1.4.2发展趋势5

1.5课题研究意义与目的5

1.5.1本课题研究的意义5

1.5.2本课题研究的目的6

1.6本课题研究的主要内容6

2数控旋锻机床的工作原理与方案论证7

2.1 旋锻机机床工作原理7

2.2 旋锻机结构形式与方案论证8

2.2.1旋锻机结构形式8

2.2.2旋锻机的结构方案论证9

3数控旋锻机床性能和要求11

3.1 数控旋锻机床性能11

3.1.1 数控旋锻机床的加工特点11

3.1.2 旋锻锻造机床加工的优点11

3.1.3数控旋锻机床的缺点12

3.1.4数控旋锻机床加工出零部件的精度12

3.2 旋锻加工与传统加工方式的比较13

3.2.1 零部件传统的加工方式13

3.2.2 数控旋锻机床的加工相对传统机械加工的优势13

3.3 旋锻加工时对毛坯件的要求14

3.3.1对毛坯尺寸误差的要求14

3.3.2 表面光洁度度及形状误差的要求14

4数控旋锻机床主要组成部分15

4.1 数控旋锻机床主要组成部分15

4.2 数控旋锻机床的楔铁进给机构15

4.3 数控旋锻机床锁紧机构17

4.4 数控旋锻机床冷却油供应系统18

4.5数控旋锻应系统机床液压油供18

4.6数控旋锻机床控制系统19

4.7数控旋锻轴咬合方式19

4.8数控旋锻机床的电力驱动以及电机座19

4.9刹铁和模具的设计20

4.10 模具的结构设计与分析21

5数控旋锻机床结构设计与校核22

5.2外轴与内轴支承部件的选择------轴承24

5.3旋锻机销轴强度校核24

5.4受倾覆力矩的螺栓组连接29

5.5普通V带传动设计30

5.6数控旋锻机离心力计算32

6有限元分析32

6.1结构有限元分析原理32

6.2结构有限元建模分析流程33

6.3支撑零部件有限元结构分析结果34

致 谢37

参 考 文 献38



内容简介:
Multi-purpose aggregate machine-tool time Timothy and Jacobs, Denis A receives then then, outstanding Philip U.S.A. Michigan university Summary:The aggregate machine-tool machining center may cause the demand which the processing manufacturing industry adapts changes unceasingly, uses the pool of labor power effectively, and has the competitive power in global scales market. Key word: Make the lathe up Regarding the multi-purpose aggregate machine-tools, in the industrial field has many names to describe it, like “the multitasking installment”, “the multi-purpose engine beds”, “the multi-procedure production system” and so on, it may be called the processing domain truly the nova, may reduce the cost, the simplified disposition, and has maintained in the US territory produces. In the past only then used the duty which many machine operations could complete, now may concentrate to an engine bed on processes completes. As a result of market demands unceasing change, the product life cycle is reducing unceasingly, todays market more intense demand multitasking installment concept. Carries out the fine profit management when the entire production environment, compared to having not concentrated the components processing to a machine on completes a finer profit. Some traditions manufacturing industry manufacturer thought that the multi-purpose aggregate machine-tools are too complex, very difficult to find the appropriate operators also the difficult problem innovates on the spot on the insufficiency for the metal working basic principle and in the Production workshop related new engine bed use solution aspect training. Intuition type technical control The equipment use “carries off the quantity of heat” the type design, has different material which the lathe bed, the steeliness straight line rolling guide, on the steeliness revolving tool box saddle, the equipment uses, all these combine make an engine bed together. These with the thermal conductivity, the volume expansion are related. All different sizes thing can by the different speed growth. As a result of this reason, needs to make the hot friendly engine bed, with the aim of knowing gives off heat the weak point in where, can compensate through the reasonable engine bed design. The part is the entire journey movement. The engine bed glide produces rubs and transform hotly. The machining produces the hot filings fall to the different place, the refrigerant can mix in the entire process in which. Will present the different temperature province continually on the cutting tool, will therefore also have many things to have the influence to the thermostability. The cutting tool technology turned the multi-purpose aggregate machine-tools has had the milling and cutting power “the versatile machine”. According to the material introduced that the most remarkable characteristic is in these engine bed whole has the intuition. The anti-collision preservation technology was already mature, in certain circumstances, even if uses the manual operation pattern, can also avoid the occurrence which collides. Because the control software has the very good intuition, the user operation friendly degree unceasingly is also enhancing. Believe the multi-purpose aggregate machine-tools by its survivability world-wide in the more different processing scenes. The off-line programming optimization and the NC automatic control systems formation already made this technology to be easier to accept, when therefore uses the procedure when the engine bed, does not need to spend many time tune-up procedure and confirmed that some part does not have the question. If components need to provide the high and low two revolving tool box saddle simultaneously to carry on the rough machining, in this kind of situation the programming is quite difficult, because it needs two revolving tool box saddles also to feed. The AdMac system may realize tool rests automatic programming which simultaneously feeds to these, and can cause the correct main axle speed, the correct feed rate and so on all parameters to realize the synchronization. Okuma Corporations collision avoidance system design based on actual processing operating mode anti-collision simulation, therefore, if the operator has installed the wrong cutting tool or has established the wrong parameter, the control system will examine and prevents the engine bed to enter the processing condition. Through cooperates with the Siemens, INDEX Corporation may provide the 3D pattern now “the hypothesized engine bed”, has custom-made according to some specific models engine bed. The result indicated that the simulation processes not only the fabricated parts and the actual end product is similar, is the one-to-one copy simply. The intuition type control interface, the simulation as well as other software technique are progressive, the more Production workshops have opened wide the front door to the multi-purpose aggregate machine-tools, but if does not have the corresponding knowledge to train and to solve the question creativity, the manufacturer is also very difficult to realize and the full use advanced engine bed flexibility aspect superiority. The work which does to the machine are more, the machine will be more complex, also needs to have the stronger skill person correspondingly to be able to operate it. If machinist past one day operated 3 engine beds, then he has this kind of multi-purpose engine bed now, might produce more components. More importantly, he may draw support from softwares help to cause the production efficiency to be higher, regarding transformation processing components preparation, may also establish the processing craft plan. Because the replacement components need to lower 3 main axles, therefore before replacing the components, the workshop should process as far as possible many components. Regarding the multi-purpose engine beds, the transformation components speed is quick, the production batch of time interval is shorter, the stock is lower, the production efficiency is higher. Can use multi-purpose engine beds some workshops fully, very quick will discover the post function the unification. Now, a workshop may only use an operator, an adjuster and a programming teacher, in the future these 3 work definitely may do by a person. In the traditional post description the machinist will transit becomes one to adjust engineer, if this engineer the familiar components processing programming, that were also more ideal. Regarding such transformation, training has been simple, so long as trains 1 individual line, but is not 3 individuals. Looking from the long views, this will provide to the people the higher post degree of satisfaction. When adjusts engineer to be responsible to process the programming, and pays attention to the components processing personally time the entire process, he completely has become this components control. In addition, but should also makes more effort in the cutting tool choice and the programming aspect, must make any model the multi-purpose aggregate machine-tool to succeed, the workshop needs to provide the skilled machinist, has ability and completes many kinds of operations nimbly. Therefore, crosswise training was at any time in the past more important. Regarded as the milling and the lathe work the different discipline the viewpoint never to return. Regarding the programmers, this belongs to their time. Regarding personnel who will program, will understand the engine bed and controls it, this will be their ability manifestation. The cutting tool will choose most people not to install the passenger vehicle tire to the race car on, but processed the cutting tool to have such situation. The cutting tool should match with the new engine bed, is conceivably redundant on the new engine bed uses the old cutting tool to the production efficiency influence. In order to match the multi-purpose aggregate machine-tools, the new cutting tool and the cutting tool adapter technology was already developed. At present the industrial field is developing the development the processing cutting tool, may complete the turning on the identical tool rest, boring and drills truncates the processing, is only processes the phase to differ from regarding the work piece angle. The processing operates the difference even confuses is unclear. The new processing cutting tool may complete the milling and the turning. Since has moved the technology (engine bed) is this century develops is extremely rapid and one of influence enormous science and technology. The modern automation technology is one kind of completely new productive forces, is one of direct creation public wealth principal means that is playing the enormous promotion effect to humanitys production activity and the material civilization. Therefore, the automated technology receives various countries widely to take seriously with more and more applications. As machine tool has a strong interchangeability, it is necessary to improve the general level of production technology components to improve the accuracy of parts.Complete specification, dynamic and static performance parameters of advanced.In the machinery manufacturing industry, accounting for about 70% of small and medium batch production, in some of the production enterprises, such as machine tools, valve industry, with its key process using combination of machine tools.The development of adjustable, quick transfer, assembly and flexible to adapt to the characteristics of multi-species processing machine tool is very urgent.Turret machine tool spindle box, can be combined for box-type machine tool spindle and automatic tool change CNC machine tool can be used for small batch production, but the complex structure of such machines, the cost is higher.The development of new tools.Improve the durability of the tool, greatly shorten the combination of machine tool downtime and more time for tool change and improve the economic benefits of the combined machine.To develop automatic detection technology.Automatically detect the size and bows and arrows, including the hardness of the blank check, drilling depth, cutting tools break, finishing size and geometry of the inspection, due to the rapid development of electronic components, integrated controller, microprocessor applications, is more automated detection technologyreliable, and can be machined components control the actual size smaller than the prescribed tolerance range, but also the workpiece can be processed are grouped according to tolerance, so that by grouping tolerance assembly. The machinery automation (engine bed), mainly refers to the machine-building industry applies the automated technology, realizes the processing object continuously the automatic production, realizes the optimized effective automatic production process, the increase production investment processing transformation and the flow rate. The machinery automation technologys application and the development, are the machine-building industry technological transformations, the technology advancement principal means and the technological development main direction. Machinery automation technical standards, not only affects the entire machine-building industry the development, and has the very tremendous immediate influence to the national economy various departments technology advancement. Therefore, develops our countrys machine-building industry automation technology, conforms to our country socialism basic principle, conforms to our country modern production law of development. How to develop our countrys machinery automation technology (engine bed), here has the technical policy question, should be realistic, all embark from our countrys concrete national condition, do each foundation work, takes the Chinas road of machinery automation technological development. The domestic and foreign industry history tells us, realizes the machinery automation is from to high-level, from simply to complex, from is preliminarily imperfect the consummation the developing process. After machines operation uses the automatic regulator, the production method only then gradually transits from the mechanization to the mechanism control (tradition) automated, the numerical control automation, the computer control automation. Only then after having established the Automated factory, the production process can overall automate, can make the productivity to enhance comprehensively, achieves automated the high-level ideal stage. The machinery automation technology first starts from the 1920s in the machine manufacture cold finishing production in enormous quantities process to develop the application, after in the 60s, to adapt the market demand and the change, for the enhancement machine-building industry to the market nimble rapid reactions ability, starts to establish the variable automation production system, namely revolves the computer technology the flexible automation. It is in the manufacture system invariable or in the change small situation, the machinery equipment either production management process through the automatic detection, the information processing, the analysis judgment realizes the anticipated operation or some kind of process automatically, and can from make one kind of components to transform automatically to makes another kind of different components. The social practice proved that under this kind of definitions manufacture system automation and the contemporary majority enterprises are not actually accommodating. The contemporary society also not in the science and technology, the material and the personnel aspect prepares to realize this automated condition, insists such to do only meets the wasted effort. This kind of situation is not exceptional regarding the separate production methods machine-building industry, the difficulty can bigger. In the 80s internationally appeared started to use computer integration manufacture system CIMS (Computer Integrated Manufacturing), the flexible automation production pattern also had this kind of situation. The initial period take the information integration as a key point, take the high automaticity as the characteristic, but in realized in the process to encounter the difficulty. In view of the fact that realizes the large amount investment which the computer integration manufacture systems automation overall needs (an overall Automated factory to spend several hundred hundred million US dollars, flexible manufacture system regular price is 600 25,000,000 US dollars), undertakes the huge risk, in addition questions and so on technical difficulty and reliability, the world industrially advanced country started “to run into a wall produces a different product”, transfers pays great attention the information integration the effect, pursues low cost automation LCA (Low Cost Automation) enterprise organizational structure and movement way. The aggregate machine-tool future development more use transmissions and so on variable speed motor and ball bearing guide screw, will simplify structure, the reduction production metre; Uses the numerical control system and the headstock, the jig automatic replacement system, enhances the craft controllability; As well as integrates the flexible manufacture system and so on.Machine tool and general purpose machine tools and other special machine comparison, has the following characteristics:1) The combination of machine tool parts and standard parts common about all the machine parts and components of the total 70 to 80%, so the design and manufacturing cycle is short, less investment, high efficiency, good economic results.2) The combination of multi-machine tool processing, and high degree of automation, so tools than general-purpose high production efficiency, product quality and stability, low labor intensity.3) General machine tool components are carefully designed and long-term production practice test, another batch manufacturing plant, so the structure stable, reliable, easy to use and maintenance.4) When processing parts on a combination machine, the use of special fixtures, tools and guidance devices, processing quality assurance by the technology and equipment, less demanding on the operative level.5) When the processing of product updates, the use of other types of special machine tools, its most of the pieces to be scrapped.Combination machine tool, its common parts and standard parts can be reused, do not be designed and manufactured.6) machine tool automatic machine tool easily linked into line to meet the needs of large-scale production.Machine tool commonly used in general components are: body, base, column, power box, power slide, cutting a variety of first class technology.For some sequential processing by the multi-station machine tool, also has a movable table or rotary table.Power box, cutting head and a variety of technology is a combination of power sliding table cutting machine to complete the main campaign or feed movement of the power unit.Also managed to complete the cutting of which the main movement and feed movement of the power head.Body, column, the middle base is a combination of machine tools and other supporting components, play a machine based skeleton.Machine tool parts between rigidity and accuracy of preservation, mainly by these parts guarantee. 多功能组合机床美国密歇根大学 菲利普摘要:总的机床加工中心需求的变化,这可能会导致加工制造业不断变化,采用有效的劳动力集中,并在全球范围内提高市场竞争力。关键词:关于多功能组合机床组成机床工具在工业领域有许多名称来形容,类似“多任务处理装置”,“多功能引擎床”,“多步骤生产制度“等,它可被称为真正加工领域的新星,可降低成本,简化配置,因此美国只继续保留在境内生产。在过去,只有用多机操作才能完成的任务,现在可以集中过程,以一台机床完成。由于市场需求的不断变化,产品生命周期不断缩短,市场竞争加剧,今天的市场需要多任务分期付款的概念。随着精艺管理的推出,整个生产环境,由不集中的零件加工到机器上集中一次得以完成。一些传统的制造业厂商认为多功能组合机床,工具过于复杂,很难找到合适的营办商,主要原因是缺少对工作的基本原则,工序复杂,现场和生产车间相关创新,机床使用的解决方案等方面的培训。直觉型技术控制设备使用“带走热量”式设计,不同的材料,床身,钢制直线滚动导轨的钢制周转箱鞍和设备的使用,使所有这些设备结合在一台机床。其中,热传导和体积膨胀是相互影响的。所有不同大小的东西有不同的体积增长速度。由于这一原因,需要做的是认识发热在哪里,可以通过合理的补偿解决机床设计中的薄弱点,实现柔性机床。该部分是整个行程的运动。机床滑动会产生激烈摩擦和变形。热加工生产的进程进行到不同的阶段,可以混合制冷剂在整个过程中,并且机床将提交一份关于刀具的不同温度承受范围,因此也有许多工序都受到热稳定性的影响。随着切削刀具技术转向多功能组合机床,它就成了具备铣削和切削功能的“多功能机床”。 据资料记载,这些机床最显著的特点是智能的。由于防碰撞保护技术已经成熟,在某些情况下,立即采用手动操作模式,就可避免发生的冲突。由于控制软件有很好的及时性,用户操作界面也在不断完善。相信多功能组合机床将应用于世界各地制造业,在更多不同的加工场景中,离线编程优化和数控全自动控制系统的形成已经使得这项技术更加易于接受,所以当使用程序时,机床并不需要花很多时间调试运行程序,并能够确认修改部分没问题。如果组件需要提供高,低两个旋转拖具同时进行粗加工,在这种情况下的编程是相当困难的,因为它需要两个旋转拖具不断横向进给。该系统可以反馈AdMac刀架自动编程的同时并能给出所有参数对应正确的主轴速度,进给量,而且实现了同步。大隈公司的防碰撞系统设计基于实际加工经营和防碰撞模拟技术,因此,如果该公司已安装了错误的切削工具或建立了错误的参数,控制系统将进行检查,防止机床进入加工。通过与西门子合作,INDEX公司可提供三维图案现显示”虚拟机床”,并已定制一些特定型号的机床于程序中。研究结果表明,模拟过程不仅制作的零件和产品的实际最终是相似的,而且是一对一个的模拟仿真。直观式控制界面,仿真以及其他软件技术的进步,更多的生产车间已经愿意趋向多功能组合机床加工,但如果机床生产商没有相应的知识培训和解决现场突发问题的能力,制造商也很难充分利用先进机床灵活性方面的优势。机器做的工作越多,机器将越复杂,同时也需要有较强相应技能的人才能来操作。在过去,如果机械师一天可以生产3台机床组件,那么现在他有这样一个多功能机床,可能会产生更多的组件。更重要的是,他可以借助相关软件的帮助,促使生产效率更高,零部件加工过程简化,也可以确立加工工艺方案。由于需要更换3主轴部件,因此在更换之前,车间应处理尽可能多的组件。由于多用途引擎床转换组件速度快,所以生产批量的时间间隔较短,生产效率较高。经过关于能否广泛的使用多功能组合机床的一些研讨会的召开,大家很快发现各种功能之间是统一的。过去一个车间可能要用一个操作者,一个调解人员,一个编程人员,现在这三个不同的工作完全可以由一个人来做。相比传统的工艺中,机械师将由一名工程师来担当,如果该工程师熟悉零件的加工工序,这将是更理想的。对于这种转变,培训将更加简单,就像火车只有一个方向而不是三个方向。从长远来看,这也将提高操作员对该职位的满意度。当工程师在做规划时,将会更加注重零件加工的全过程,完成全过程控制。此外,他还需要努力向刀具使用和工艺规划方面发展,还要做出任何型号的多功能组合机床的工具,因此,车间需要提供熟练的机械师,他要有能力完成多种灵活的操作。所以,横向培训比以往任何时候都重要,机械加工中将铣,车视为完全不同学科的观点将不再了。对于程序员来说,这是属于他自己的时间,谁编的程序,谁就会明白机床的功能,谁就能完全操作它,这就是编程人员的个人能力了。生活中大多数人不会选择把普通轿车的轮胎用在赛车上,但是工艺师选择刀具时却是可以的。可能大家认为新的机床应配以新的刀具,否则旧的刀具将会影响新的机床加工效率,但是为了配合多功能组合机床,新的刀具和刀具适配技术也已经开发,目前工业领域开发的新加工刀具,
温馨提示:
1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
提示  人人文库网所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。
关于本文
本文标题:旋锻机机头部分结构设计与分析【5张图纸】【Word+CAD全套设计】【优秀】
链接地址:https://www.renrendoc.com/p-444585.html

官方联系方式

2:不支持迅雷下载,请使用浏览器下载   
3:不支持QQ浏览器下载,请用其他浏览器   
4:下载后的文档和图纸-无水印   
5:文档经过压缩,下载后原文更清晰   
关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

网站客服QQ:2881952447     

copyright@ 2020-2024  renrendoc.com 人人文库版权所有   联系电话:400-852-1180

备案号:蜀ICP备2022000484号-2       经营许可证: 川B2-20220663       公网安备川公网安备: 51019002004831号

本站为文档C2C交易模式,即用户上传的文档直接被用户下载,本站只是中间服务平台,本站所有文档下载所得的收益归上传人(含作者)所有。人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。若文档所含内容侵犯了您的版权或隐私,请立即通知人人文库网,我们立即给予删除!