资源目录
压缩包内文档预览：(预览前20页/共61页)
编号：76249528
类型：共享资源
大小：924.33KB
格式：ZIP
上传时间：2020-04-28
上传人：柒哥
认证信息
个人认证
杨**（实名认证）
湖南
IP属地：湖南
40
积分
- 关 键 词：
-
说明书+CAD
托架
级进模
设计
说明书
CAD
- 资源描述：
-
芯轴托架级进模设计【说明书+CAD】,说明书+CAD,托架,级进模,设计,说明书,CAD
- 内容简介：
-
无锡职业技术学院毕业设计任务书毕业设计（论文）任务书2013年 9 月 19 日毕业设计（论文）题 目 支架冷冲模设计题目来源自拟指导教师范祖贤职称副教授所在部门机械技术学院学生姓名王雪松学号28班 级模具11132所属院系专业模具外语翻译要求翻译后中文字数约2500字左右，内容与课题相关。课题需要完成地任务【工程设计类课题：】 根据导师下达地毕业设计任务，查阅相关设计资料（不少于5本），综合应用所学地专业知识，填写开题报告。对产品进行冷冲压工艺分析，制订完整地冲压工艺方案，计算所需地工艺数据，设计合理地模具结构，正确选用标准件与常用件。绘制装配图（1-2张）与主要工作部分零件图（不少于5张）。编写冷冲压工艺卡片与主要工作部分零件加工工艺过程卡，撰写完整地设计说明书1份（15000字以上）。课题计 划 安 排序号内 容时 间 安 排1查阅相关设计资料填写开题报告2013.9.239.292制订完整地冲压工艺方案及计算工艺数据2013.9.3010.113设计冷冲模结构，绘制装配图与零件图2013.10.1411.14整理冷冲模设计说明书2013.11.411.205填写冲压工艺卡、零件加工工艺过程卡、小结打印所有资料并装订2013.12.12014.3.21计划答辩时间2014年4月 日答辩提交资料2014年 月 日教研室主任审核意见签名： 支架冷冲模冷冲成型工艺卡冲压工艺卡产品型号 零部件名称支架共1页 产品名称支架零部件型号第1页材料牌号及规格/mm材料技术要求毛坯尺寸/mm每毛坯可制条数每条件数消耗额定Q235钢，厚2mm134.12x30x2工序号工序名称 工序内容加工工序简图设备工艺装备备注01送料 自动送料机02冲侧刃确定送料的宽度压力机J23-25 03落料切除侧边压力机J23-2504预弯 弯曲两角 压力机J23-2505第二次弯曲弯曲中间部分压力机J23-2506冲孔冲直径为5.5的孔压力机J23-2507切边切除废边压力机J23-2508检验按产品图纸检验09王雪松编制(日期）审核（日期）会签（日期）标记处教更改文件号签字日期外文翻译(1)To meet domestic small quantity multiple types of demand, research Flexible automatic assembly robot technology is very important. This paper presents a small can be used for a wide variety of mechanical and electrical products assembled four-position rotary robot flexible assembly workstations, introduced its structure, functions and control systems. Rotary flexible robot assembly workstation suitable for a variety of small electromechanical products automatic assembly, the system posed difficult to adjust, Logistics assembly process may at any time change direction, the production rhythms easily changed, and small footprint. It can meet within a certain range of different models, different technical requirements, different quantities of different products automatic assembly needs.As electronic technology and the rise of Software Technology, modern industrial production appeared to flexible manufacturing technology and flexible assembly technology as the representative of a series of advanced manufacturing technology, The emergence of these technologies to meet the multiple varieties, small quantities of personalized products to the market demand. man from the heavy labor repeat liberation, lower product costs, shorten the production cycle, improve the market competitiveness. To demonstrate to the public the modernization of computer integrated manufacturing technology, Shanghai Science and Technology Museum established a demonstration of the robots, automated assembly lines, Presentations to the public for modern industrial production from product design, parts manufacturing products to the entire assembly process, and CAD / CAM technology, logistics management technology and flexible robot assembly, and other key technologies. Users of the system including design modules, carving processing modules, assembly modules, control modules, transmission line transmission and control as part of the logistics.To meet the increasing globalization of competition in the market, more and more manufacturers have gradually shifted their production patterns from a single species, mass production to more varieties and small batch production. And the introduction of modern integrated manufacturing system CIMS, that is, they use the computer to the traditional manufacturing technology and modern information technology, management technology, automation technology and systems engineering technology combined with the CIMS philosophy constitute computerized, information, Intelligent integration of advanced manufacturing systems. In the products manufacturing process, the assembly of the final product is the specific function of a final process, Assembling the economic importance is often, enterprises need to invest more efforts to improve the efficiency of assembly operations and cost. Small quantities of product assembly, the special tailor-made fixtures is not economical, once changed product range, equipment needs upgrading, causing a large amount of funds wasted. Under such circumstances, FAS FAS provides a flexible solution. FAS is the development of agile response to the demand of the product changes, break the rigid labor-intensive and automation mixed mode of production, the use of flexible automation system. FAS is the flexible assembly line system to handle the random there are different kinds of products, using simple software change control parameters and methods will be able to assemble different products. Our pursuit of the goal of the design is to use computers, robots and other advanced optimization technology integration, improve product design, manufacture, assembly process to meet the different types of small quantities of volatile products, reduce product assembly labor cost, reduce assembly time, improve the working environment and shorten product design and manufacturing cycle, and seek high quality and low cost-effectiveness of the overall enterprise. Modern manufacturing technology to the development of the traditional manual assembly process is facing severe challenges. Automatic assembly is aimed at reducing or instead of relying on manual skills and judgment for the complex assembly operations, thereby enhancing the efficiency of production and ensuring product quality. flexible assembly systems such as CIMS has become such a modern manufacturing system an important part, Special adapted to the large-scale, small quantity and variety of production assembly systems, for the future industrial development of great significance. any assembly work was done by some simple Plum - up campaign poses. Put up with a loaded parts to another parts, will be among the relatively stationary and movable parts of the state as required by the location or fixed portfolio. assembly The moves include positioning, crawls, moving, place, tie, testing and feedback; The assembly process includes information on parts, transmission, assembly. and parts of the orientation and positioning precision assembly process affect the stability and quality assembly of the key factors assembly equipment reliability is an important guarantee. Among them, accurate automatic transmission positioning materials for assembly automation system is the most important one of the institutions. Because of its aerodynamic transmission medium (compressed air) characteristics of the effect of exercise poor accuracy and stability. But its good comprehensive technical characteristics, Drive it has become the most suitable technology to replace manual operation of a form. The past 10 years, automation technology and components in the system and electronic control technology, made electromechanical integration, and Manufacturing generally used a robot technology. Robot use the identification, location, detection, compensation, the functions of the collision and its pliancy assembly technology, can greatly improve production flexibility and productivity, shorten production cycles, ensure product quality and reduce costs. Automatic assembly robot technology in recent years in various fields has been widely used.(2)Turning The engine lathe ,one of the oldest metal remove machines, has a number of useful and desirable attributes. Today these lathes are used primarily in small shops where smaller quantities rather than large production runs are encountered.The engine lathe has been replaced in todays production shops by a wide variety of automatic tracer lathe , turret lathe , and automatic screw , and the advantages of tools for finish and accuracy , are now at the designers fingertips with production speeds on a par with the fastest processing equipment on the scene today . Tolerances for the engine lathe depend primarily on the skill of the operator .The design engineer must be careful in using tolerances of an experimental part that has been produced on the engine lathe by a skilled operator . In redesigning an experimental part for production , economical tolerances should be used .Turret Lathes Production machining equipment must be evaluated now, more than ever before, in terms of ability to repeat accurately and rapidly. Applying this criterion for establishing the production qualification of a specific method, the turret lathe merits a high rating.In designing for low quantities such as 100 or 200 parts, it is most economical to use the turret lathe. in achieving the optimum tolerances possible on the turret lathe , the designer should strive for a minimum of operations .Automatic Screw Machines Generally , automatic screw machines fall into several categories ; single-spindle automatics , multiple-spindle automatic chucking machines .Originally designed for rapid , automatic production of screws and similar threaded parts , the automatic screw machine has long since exceeded the confines of this narrow field , and today plays a vital role in the mass production of a variety of precision parts . Quantities play an important part in the economy of the parts machined on the automatic screw machine. Quantities less than 1000 parts may be more economical to set up on the turret lathe than on the automatic screw machine, the cost of the parts machine can be reduced if the minimum economical lot size is calculated and the proper machine is selected for these quantities. Automatic Screw Machine Since surface roughness depends greatly upon material turned, and feeds and speeds employed, minimum tolerances that can be held on automatic screw machine are not necessarily the most economical tolerances. In some cases, tolerances of 0.05mm are held in continuous production using but one cut. Groove width can be held to 0.125mm on some parts. Bares and single-point finishes can be held to 0.0125mm . On high-producing runs where maximum output is desirable, a minimum tolerance of 0.125mm is economical on both diameter and length of turn. Milling With the exceptions of turning and drilling, milling is undoubtedly the most widely used method of removing metal. Well suited and readily adapted to the economical production of any quantity of parts, the almost unlimited versatility of the milling process merits the attention and consideration of design seriously concerned with the manufacture of their product. As in any other process, parts that have to be milled should be designed with economical tolerances that can be achieved in production milling. If the parts is designed with to achieve these tolerances-and this will increase the cost of the part.Grinding Grinding is one of the most widely used methods of finishing parts to extremely close tolerance and fine surface finishes , Currently , there are grinders for almost every type of grinding operation . Particular design features of a part dictate to a large degree the type of grinding machine required. Where processing costs are excessive, parts redesigned to utilize a less expensive, higher output grinding method may be well worthwhile. For example, wherever possible the production economy of center less grinding should be taken advantage of by proper design consideration.Although grinding is usually consider a finished operation, it is often employed as a complete machining process on work which can be ground down from rough condition without being turned or otherwise machined. Thus many types of forgings and other parts are finished and completely with grinding wheel at appreciable savings of time and expense. Classes of grinding machines include the following; cylindrical grinder, center less grinders, surface grinders, and tool and cutter grinders.The cylindrical and centerless grinders are for straight cylindrical or taper work; thus alpines, shafts, and similar parts are ground on cylindrical machine either of the common-center type or the centerless machine.Thread grinders are used for grinding precision threads for thread gages, and threads on precision parts where the concentricity between the diameter of shaft and the pitch diameter of the thread must be held to close tolerances.The internal grinders are used for grinding of precision holes, cylinder bores, and similar operations where bores of all kinds are to be finished.The surface grinders are for finished all kinds of flat work, or work with plain surfaces which may be operated upon either by the edge of a wheel or by the face of a grinding wheel. These machines may have reciprocating or rotating tables.That branch of scientific analysis which deals with motions, time, and forces is called mechanics and is made up of two parts, statics and dynamics. Statics deals with the analysis of stationary, those in which time is not a factor, and dynamics deals with systems which change with time.Forces are transmitted into machine through mating surfaces, e.g.,froma gear to a shaft or from one gear through meshing teeth to another gear, from a connecting rod through a bearing to a lever, from a V belt to a pulley, or from a cam to a follower. It is necessary to know the magnitudes of these forces for a wariety of reasons. The distribution of forces at the boundaries or mating surface must be reasonable, and their intensities must be within the working limits of the materials composing the surfaces. For example, if the force operating on a sleeve bearing becomes too high, it will squeeze out the oil film and cause metal-to-metal contact, overheating, and rapid failure of the bearing. If the forces between gear teeth are too large, the oil film may be squeezed out from between them. This could result in flaking and spalling of the metal, noise, rough motion, and eventual failure. In the study of dynamics we are principally interested in determining the magnitude, direction, and location of the forces.Some of the terms used in this phase of our studies are defined below.Force Our earliest ideas concerning forces arose because of our desire to push, lift, or pull various objects. So force is the action of one body cacting on another, our intuitive concept of force includes such ideas as place of application, direction, and magnitude and these are called the characteristics of a force.Matter Matter is any material or substance; if it is completely enclosed, it is called a bodyMass Newton defined mass as the quantity of matter of a body as measured by its volume and density. This is not a very satisfactory definition because density is the mass of a unit volume. We can excuse Newton by surmising that he perhaps did not mean it to be a definition. Nevertheless, he recognized the fact that all bodies possess some inherent property that is different from weight. Thus, a moon rock has a certain constant amount of substance, even though its moon weight different, its called the mass of the rock.Inertia Inertia is the property of mass that causes it to resist any effort to change its motion. Weight Weight it the force of gravity acting upon a mass. The following quotation is pertinent:The great advantage of SI unit is that there is one, and only one unit for each physical quantitythe metre for length, the kilogram for mass, the newton for force, the second for time, etc. to be consistent with this unique feature, it follows that a given unit or word should not be used as an accepted technical name for two physical quantities. However, for generation the term“weight” has been used in both technical and nontechnical fields to mean either the force of gravity acting on a o or the mass of a body itself.Particle A particle a body whose dimensions are so small that they may be neglected.Rigid Body All bodies are either elastic or plastic and will be deformed if acted upon by forces. When the deformation of such bodies is small, they are frequently assumed to be rigid, i. e. incapable of deformation, in order to simplify the analysis.Deformable Body The rigid-body assumption cannot be used when internal stresses and strains due to the applied forces are to be analyzed. Thus we consider the body to be capable of deforming. Such analysis is frequently called elastic-body analysis, using the additional assumption that be body remains elastic within the range of the applied forces.Newtons Laws Newtons three laws are:Law 1 If all the forces acting on a particle are balanced, the particle will either remain at rest or will continue to move in a straight line at a uniform velocity.Law 2 If the forces acting on a particle are not balanced, the particle will experience acceleration proportional to the resultant force.Law 3 When two particles react, a pair of interacting forces come into experience; these forces have the some magnitudes and opposite sense, and they act along the straight line common to the two particles.(4)The human race has distinguished itself from all other forms of life by using tools and intelligence to create items that serve to make life easier and more enjoyable. Through the centuries, both the tools and the energy sources to power these tools have evolved to meet the increasing sophistication and complexity of mankinds ideas.In their earliest forms, tools primarily consisted of stone instruments. Considering the relative simplicity of the items being made and the materials that were being shaped, stone was adequate. When iron tools were invented, durable metals and more sophisticated articles could be produced. The twentieth century has been the creation of products made from the most durable and, consequently, the most unmachinable materials in history. In an effort to meet the manufacturing challenges created by these materials, tools have now evolved to include materials, such as alloy steel, carbide, diamond, and ceramics.A similar evolution has taken place with the methods used to power our tools. Initially, tools were powered by muscles; either human or animal. However as the powers of water, winds, steam, and electricity were harnessed, mankind was able to further extend manufacturing capabilities with new machine, greater accuracy, and faster machining rates.Every time new tools, tool materials, and power sources are utilized, the efficiency and capabilities of manufacturers are greatly enhanced. However as old problems and challenges arise so that the manufactures of today are faced with tough questions such as the following: How do you drill a 2-mm diameter hole 670-mm deep without experiencing taper or runout? Is there a way to efficiently deburr passageways inside complex castings and guarantee 100% that no burrs were missed? Is there a welding process that can eliminate damage now occurring to my product?Since the 1940s, a revolution in manufacturing has been taking place that once again allows manufacturing to meet demands imposed by increasingly sophisticated designs and durable, but in many cases nearly unmachinable, materials. This manufacturing revolution is now, as it has been in the past, centered on the use of new tools and new manufacturing processes used for material removal, forming, and joining, known today as nontraditional manufacturing processes.(1)为了适应日益加剧的全球化市场竞争,越来越多的制造企业逐渐把生产模式由单一品种、大批量生产转向多品种、中小批量生产。并且采用现代集成制造系统CIMS ,即利用计算机将传统的制造技术与现代信息技术、管理技术、自动化技术和系统工程技术结合,用CIMS哲理构成计算机化、信息化、智能化、集成化的先进制造系统。在产品的制造过程中,装配是实现最终产品的特定功能的最后一道工序,装配的经济重要性往往需要企业投入较大努力去改善装配操作的效率和成本。对中小批量产品装配来说,专用特制固定设备是不经济的,一旦改换产品种类,设备需更新换代,造成大量资金浪费。在这种情况下,柔性装配系统FAS提供了一个柔性化解决办法。FAS的开发是为了敏捷响应产品需求的动态变化,打破劳动密集型和刚性自动化混杂的生产模式,采用柔性的自动化系统。FAS 的柔性在于系统能够处理装配线上随机出现的几类不同的产品,采用简单地改变软件和控制参数的方法就能装配不同的产品。我们追求的设计目标是利用计算机、机器人等先进技术集成优化,改进产品的设计、制造、装配过程,以适应中小批量不同种类产品多变的要求,降低产品装配的劳动力成本,减少装配时间,改善工作环境,缩短产品设计制造周期,求得高质低耗的企业总体效益。现代制造技术的发展使传统的手工装配工艺面临严峻的挑战. 自动化装配的目的在于减轻或取代依赖人工技巧和判断力进行各种复杂的装配操作,从而提高生产效率,保证产品质量. 柔性装配系统已成为诸如CIMS 这类现代制造系统的一个重要环节,特别适应于大规模、小批量、多品种的生产装配系统,对未来工业发展有重要意义.任何装配工作都是由一些简单的“拾”“放”运动所构成. 把一个零件拿起来装到另一个零件上,并将相互间处于相对静止状态和可动状态下的零件按其所要求的位置进行组合或固定. 装配的动作包括定位、抓取、移动、放置、配合、检测和反馈等;装配的过程包括零件的上料、传送、装配. 而零件的定向和定位精度是影响装配过程的稳定性及装配质量的主要因素,是装配设备可靠工作的重要保证. 其中,准确的自动供料及传送定位是装配自动化系统最主要的工作机构之一.气动由于其传动介质(压缩空气) 特性的影响,运动精度及稳定性较差. 但其良好综合技术特性,使它成为各种传动技术中最适合用来取代人手操作的一种实现形式. 近10 年来,自动化技术在系统及元件控制方面与电子技术结合,实现机电一体化,同时, 制造业中普遍采用了机器人技术。利用机器人的识别、定位、检测、补偿、避碰等功能和它的柔顺装配技术,可以大幅度提高生产柔性和生产率,缩短生产周期,保证产品质量,降低成本。机器人自动装配技术近年来已在各个领域得到广泛应用。(2)车削 普通车床作为最早的金属切削机床中的一种，目前仍然许多有用的和为人们所需要的特性。现在，这些机床主要用在规模较小的工厂中，进行小批量的生产，而不是进行大批量的生产。在现代的生产车间中，普通车床已经被种类繁多的自动车床所取代，诸如自动仿形车床，六角车床和自动螺丝车床。现在，设计人员已经熟识先利用单刃刀具去除大量的金属余量，然后利用成形刀具获得表面光滑度和精度这种加工方法的优点。这种加工方法的生产速度与现在工厂中使用的最快的加工设备的速度相等。普通车床的加工偏差主要依赖于操作者的技术熟练程度。设计工程师应该认真地确定由熟练工人在普通车床上加工的实验零件的公差。在把试验零件重新设计为生产零件时，应该选用经济的公差。六角车床 对生产加工设备来说，目前比过去更着重评价其是否具有精确的和速度的重复加工能力。应用这个标准来评价具体的加工方法，六角车床可以获得较高的质量评定。在为了小批量的零件（100-200件）设计加工方法时，采用六角车床时最经济的。为了在六角车床上获得尽可能小的公差值，设计人员应该尽量将加工工序的数目减至最少。自动螺丝车床 自动螺丝车床 通常被分为以下几种类型：单轴自动、多轴自动和自动夹紧车床。自动螺丝车床 最初是用来对螺钉和类似的带有螺纹的零件进行自动化和快速加工的。但是，这种车床的用途早就超过了这个狭窄的范围。现在，它在许多种类的精密零件的大批量的生产中起着重要的作用，如果工件少于1000件，在六角车床上进行加工比在自动螺丝车床上经济得多。如果计算出最小经济批量，并且对工件批量正确地选择机床，就会降低零件的加工成本。自动仿形车床 因为零件的表面粗糙程度在很大的程度上取决于工件材料、刀具、进给量和切削速度，采用自动仿形车床加工所得到的最小公差不一定是最经济的公差。在某种情况下，在连续生产过程中，只进行一次切削时的公差可以达到0.05mm。对于某些零件，槽宽的公差可以达到0.125mm。在希望获得最大产量的大批量生产中，进行直径和长度的车削时的最小公差值为0.125mm是最经济的。铣削 除了车削和钻削，铣削无疑是应用做广泛的金属切削方法。铣削非常适合于而且也易于应用在任何数量的零件的加工上。在产品制造过程中，许许多多种类的铣削加工是值得设计人员认真考虑和选择的。与其他种类的加工一样，对于进行铣削加工的零件，其公差应该被设计成铣削生产所能达到的经济公差。如果零件的公差设计得比需要的要小，就需要增加额外的工序，以获得这些公差-这将增加零件的成本。磨削 磨削是一种应用最广泛的零件精加工方法，用来获得非常小的公差和非常高的表面光滑度。目前，几乎存在着蛇和与各种磨削工序的磨床。零件的设计特征在很大的程度上决定了需要采用的磨床的种类。当加工成本太高时，就值得对零件进行重新设计，使其能够通过采用既便宜又具有高生产率的磨削方法加工出来了。 例如，在有可能的时候，可以通过对零件的适当设计，尽量用无心磨削加工，以获取经济效益。尽管通常认为磨削适用于精加工工序，对那些适合于采用磨削来完成粗、精加工工序的工件，也通常采用磨削方法完成全部加工工作，而不采用车削或者其他的方法。外圆磨床和无心磨床是用来磨削圆柱形工件或者圆锥形工件的。因此，花键轴、轴和其他类似零件是采用普通的外圆磨床，或者采用无心磨床进行加工的。螺纹磨床用来磨削螺纹量规上的精密螺纹和用来磨削螺纹的中径与轴的同心度公差很小的精密零件上的螺纹。内圆磨床用来磨削精密的孔、汽缸孔以及各种类似的，需要进行精加工的孔。平面磨床用来对各种片面工作，或者带有平面的工件进行精加工。可以采用砂轮的边或者砂轮的端面进行磨削。这类机床上装有往复式工作台或者回转式工作台。(3)对运动、时间和作用力作为科学分析的分支称为力学。它由静力学和动力学两部分组成。静力学对静止系统进行分析，即在其中不考虑时间这个因素，动力学对随时间而变得系统进行分析。力通过配合表面传到机器的各个结构中。例如，从齿轮传到轴或者齿轮通过吻合的齿轮传到另一齿轮，从连杆通过轴承传到另一杆件，从三角皮带传到皮带轮，或者从凸轮传到到从动件。由于很多原因，人们必须知道这些力的大小。这些力在边界或在配合表面的分布必须合理，它们的大小必须在构成配合表面的材料的工作极限以内。例如，如果作用在一个套筒轴承上的力太大，它将会将油膜挤出，造成金属与金属的直接接触，产生过热和使轴承快速实效。如果齿轮吻合的齿之间的力国大，就会将油膜从齿间挤压出来。这会造成金属的碎裂和剥落，噪音增大，运动不精确，直至报废。在力学研究中，我们主要关心力的大小、方向和作用点。我们将要用到的一些术语定义如下：力 关于力的最早概念是由于我们需要推、举、拉各种物体而产生的。因此， 力是物体之间的相互作用。力的直观概念包括作用点、方向和大小。这些称为力的要素。物质 物质是任何材料或实体， 如果它是全封闭的，则称为物体。质量 牛顿将质量定义为用物体的体积和密度来度量的， 物体所含物质的量。因为密度是单位体积的质量，所以这不是一个很令人满意的定义。我们估计当时牛顿大概没有意识到他下定义，因而我们可以原谅他。不过，它认识到这样一个事实， 一切物体都具有某种与重量不同的内在物质。尽管一块月球岩石在月亮上和地球上的重量不同，但它的物质能量是不变的。这不变的物质含量就成为岩石的质量。惯性 惯性是质量所具有的抵抗任何力改变其本身运动状态的性质。重量 重量是作用在质量上的重力。下列引文确切地论述了质量和重量的关系：国际标准单位制的最大优越感性是，对每一个物理量有一个，而且只有一个单位-如长度单位为米，质量单位为千克，力的单位是牛顿，时间的单位是秒等。为了这种单一性相一致，一个给定的单位或词不能作为两个物理量的技术名词。但是许多年以来，“重量”这个词在技术领域和非技术领域中都被用来既表示作用在一个物体上的重力，又表示物体本省的重量。质点 当一个物体的尺寸特别小，可以忽略不计时，该物体可以称为质点。刚体 所有的物体，不管是弹性体还是塑性体，在外力作用下都将发生变形。当物体的变形很小时，为了简化计算，通常假设这个物体是刚体，也就是认为它没有发生变形。变形体 在分析由于外力的作用引起物体内的应力和应变时，不能采用刚体假设。这时，我们认为物体能够变形，这样的分析通常称为弹性体分析，这时所用的假设为，在作用力的范围内，物体是弹性的。牛顿定律 牛顿的三定律为： 第一定律 如果作用在一个质点上的所有外力平衡，那么，这个质点保持原来的静止会或者匀速直线运动状态不改变。第二定律 如果作用在一个质点上的所有外力不平衡，那么，这个质点将产生一个与外力合力成正比的加速度，
- 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。
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。
川公网安备: 51019002004831号