偏心链轮不等速机构设计开题报告

编号无锡太湖学院毕业设计（论文）相关资料题目： 偏心链轮不等速机构设计 信机 系 机械工程及自动化专业学 号： 0923103 学生姓名： 郑 莉 指导教师：唐正宁（职称：副教授 ） （职称： ）2013年5月25日目 录一、毕业设计（论文）开题报告二、毕业设计（论文）外文资料翻译及原文三、学生“毕业论文（论文）计划、进度、检查及落实表”四、实习鉴定表无锡太湖学院毕业设计（论文）开题报告题目： 偏心链轮不等速机构设计 信机 系 机械工程及自动化 专业学 号： 0923103 学生姓名： 郑 莉 指导教师： 唐正宁 （职称：副教授） （职称： ）2012年11月24日 课题来源本课题来源于生产实际，结合实际要求，完成偏心链轮不等速机构设计，并能满足生产实际要求，本课题对提高学生的自主学习能力有很大的帮助，将所学知识与实际相结合，具有重要的意义。科学依据（包括课题的科学意义；国内外研究概况、水平和发展趋势；应用前景等）（1）课题科学意义随着科技和经济的快速发展，社会对自动化设备的需求越来越大，此机构用于塑料制袋包装机上，利用偏心链轮可以使塑料薄膜送进速度与热封辊圆周速度相等，保证热封辊快速张开，以免热封辊被包装物相碰。这一研究对工业有很大帮助。（2）研究概况，水平和发展趋势在机械加工过程中，偏心链轮机构的链轮松紧是一大难题，通过优化张紧轮的转动中心位置，偏心量和初始角位移，使链条在工作中始终处于张紧状态，才能提高生产效率，因此着重于这个问题，利用微分原理对该机构进行运动学分析，列出了主从链轮位移关系的求解方程，并依此为基础，进行了传动系统的运动学分析和张紧轮的轮心坐标，初始相位移和偏心量的优化计算，其目的是在周期中使链条波动最小。（3）应用前景偏心链轮用于包装机上，可以提高生产效率，降低生产成本，操作简捷，在能满足条件的前提下，不失为一种好的选择，应用前景良好。研究内容 阅读外文资料，并翻译与所学专业或课题相关的外文文献5000字左右，语句通顺、流畅、准确； 根据加工产品上具体结构和加工要求，拟定分析设备设计方案； 运用三维软件进行三维造型设计、三维装配； 绘制设备总装图和关键零部件二维工程图； 编写设计说明书，符合本科论文的格式要求，语言简洁、流畅、层次分明； 毕业设计作为重要的学习实践环节，本人在设计工作中做到积极主动，严谨细致、灵活，使设计方案、工程图纸符合国家标准。拟采取的研究方法、技术路线、实验方案及可行性分析此机构主要部件有：调节旋钮，偏心调整架，主动轴，调整螺杆，偏心链轮，链条，张紧轮，旋转切刀，横封辊，纵封辊等组成。其工作原理是：调节主动链轮的偏心距达到改变输出角速度满足热封的需要,它是利用特性曲线的两个极值点作为专门的热封点,偏心距的改变可使输出的极大角速度在之间;同样也可使输出的极小角速度在之间。与此同时,速度极限角分别有向靠拢的微小变化,袋装机在规定的袋长范围内,其中偏小规格利用的极点进行热合,偏大规格利用这一极点输出角速度进行热合可行性分析：通过各主要部分系统的确定，主要问题可以解决。细节问题也可以方便的处理，总的来说，此方案的可行性没有问题。研究计划及预期成果1. 2012.11.112.1 搜集、阅读、整理相关文献资料，英文翻译，工厂实习等。2. 2012.12.11.1 撰写开题报告。3. 2013.1.12.1 确定工作原理，设计总体方案，可行性分析。4. 2013.2.13.1 总体结构设计。电动机的选择，参数确定，强度计算，刀具的材料和类型的选择，刀具和重要部件的有限元分析，优化设计，通过三维造型设计，进行三维装配。完成设计规定量的设计图纸。 5. 2013.3.14.20 编写设计说明书。6. 2013.4.205.20 修改设计图纸，完成设计任务。 预期成果：完成设备的机械部分设计及相关计算，绘制好机械部分设计的CAD三维图和主要二维图纸。 特色或创新之处 此机构结构紧凑，制造方便。操作简便，灵活，运转平稳，成本低，从而使降低动强度，提高生产效率。已具备的条件和尚需解决的问题已具备的条件：1. 已了解偏心链轮的工作原理和工作路线，对链轮的结构已经有初步的认识，也具备机械设计，齿轮的选择等的能力。2. 能够运用软件进行设计、模拟。3. 相关资料齐全，有了初步可行的设计方案，技术条件具备。尚需解决的问题：设计方案有待完善，软件应用的熟练程度需要加强。指导教师意见 指导教师签名：年 月 日教研室（学科组、研究所）意见 教研室主任签名： 年 月 日系意见 主管领导签名： 年 月 日Cylinder block machining process design Engine parts in the engine block is a more complex structure of spare parts box, its high precision, processing, complex process, and the processing quality will affect the overall performance engine, so it has become the engine manufacturers focus parts one.1. Technical Characteristics of the engine cylinder blockEngine block is the basic engine parts and skeleton, while the engine when the general assembly of the base components. Cylinders role is supporting and ensuring the piston, connecting rod, crankshaft and other moving parts work, the exact location; to ensure the engine ventilation, cooling and lubrication; to provide a variety of auxiliary systems, components and engine installation.1.1 Technical Characteristics Cylinder cast for a whole structure, and its upper part 4 cylinder mounting hole; cylinder standard cylinder is divided into upper and lower divisions into two parts; cylinder to the rear of the front-side arrangement of the previous three coaxial mounting hole of the camshaft and the idler axle hole. Cylinder process features are: the structure of complex shape; processing plane, more than holes; uneven wall thickness and stiffness is low; processing of high precision typical of box-type processing part. The main processing of the surface of cylinder block top surface, the main bearing side, cylinder bore, the main and camshaft bearing bore holes and so on, they will directly affect the machining accuracy of the engine assembly precision and performance, mainly rely on precision equipment, industrial fixtures reliability and processing technology to ensure the reasonableness.2. Engine block process design principles and the basis forTechnology program is the preparation of the master process is to process planning and key process equipment design guidance documents. The correct process of program design, facilitate the systematic application of new scientific and technological achievements and advanced production experience, to ensure product quality, improve working conditions, and improve process technology and process management level.2.1 Process design principlesDesign Technology program should be to ensure product quality at the same time, give full consideration to the production cycle, cost and environmental protection; based on the enterprises ability to actively adopt advanced process technology and equipment, and constantly enhance their level of technology. Engine block machining process design should follow the following basic principles:(1) The selection of processing equipment, processing equipment, the principle of selection adopted the principle of combining rigid-flexible, processing each horizontal machining center is located mainly small operations with vertical machining center, the key process a crank hole, cylinder hole, balancer shaft hole High-speed processing of high-precision horizontal machining center, an upper and lower non-critical processes before and after the four-dimensional high-efficiency rough milling and have a certain adjustment range of special machine processing;(2) focus on a key process in principle process the body cylinder bore, crankshaft hole, Balance Shaft hole surface finishing and the combination of precision milling cylinder head, using a process focused on a setup program to complete all processing elements in order to ensure product accuracy The key quality processes to meet the cylinder capacity and the relevant technical requirements; (3) All fixtures are used hydraulic clamp, clamping components, hydraulic pumps and hydraulic control components used in Germany or the United States producing high quality and reliable components; (4) The whole line used in all wet processing, using standalone BTA, high-precision machining processes critical horizontal machining center with constant cooling and to install high-precision high-voltage double-circuit band-pass fine filtration system, all with high-pressure processing center in the cold. According to the technological characteristics of automobile engine cylinder block and the production mandate, the engine block machining automatic production line is composed of horizontal machining center CWK500 and CWK500D machining centers, special milling / boring machine, vertical machining centers matec-30L and other appliances. (1) top and bottom, and tile covered only the combination of aperture rough milling machine dedicated to this machine to double-sided horizontal milling machine, using moving table driven parts, machine tools imported Siemens S7-200PLC system control, machine control cabinet set up an independent, cutting automate the process is completed and two kinds of automatic and adjust the state; (2) high-speed horizontal machining center machining center can be realized CWK500 the maximum flow of wet processing, but because of equipment, automatic BTA treatment system through the built-in tray under the wide-type chip conveyor and the completion of the machining center can be dry processing; machine tool spindle speed 6000r/min, rapid feeding speed 38m/min; (3) The combination of front and rear face rough milling machine tool using hydraulic transmission; control system imported Siemens S7-200PLC system control, machine tools have a certain flexibility; (4) The special machine TXK1500 this machine vertical machining center by the modification of shape, with vertical machining center features and performance, this machine has high strength, high wear-resistant, high stability, high accuracy, high-profile etc.; (5) high-speed vertical machining center matec-30L of the machining center spindle high speed 9000r/min. Control system uses Siemens SINUMERIK840D control system; (6) high-speed horizontal machining center spindle CWK500D highest speed 15000r/min.2.2 Process design basisAffect the engine block part of the process design factors are manifold. Specifically, can be understood from the following aspects. (1) product object, product drawings and technical documents related to the complexity of the engine block under the precision requirements of the process to take corresponding measures. Production targets for the four-cylinder automobile engine cylinder block;(2) the production program, the production of the nature and type of production of the engine block the production program of 400 million;(3) The annual effective system of work equipment, working for 320 days, with an average equipment loading rate of 80%, two shifts, 16 hours / day.3. Engine block machining process design the main content Engine block complex structure, high precision, large size, is thin-walled parts, there are a number of high precision plane and holes. Engine block machining process characteristics: mainly flat and the hole processing, processing of flat generally use planing, milling methods such as processing, processing of hole used mainly boring, processing and multi-purpose drilling holes. As the cylinder complex structure, so how to ensure that the mutual position of the surface processing precision is an important issue.3.1 The selection of blank Engine block on the materials used are generally gray cast iron HT150, HT200, HT250, there is also cast aluminum or steel plate, this engine block using high-strength alloy cast iron. Cylinder in the processing prior to aging treatment in order to eliminate stress and improve the rough casting mechanical properties.Improve the rough accuracy, reduction of machining allowance, is to improve the automated production line system productivity and processing quality of the important measures. As the foreign box-type parts of rough quality and high precision, and its production-line system has been implemented directly on the blank line, not only eliminating the need for blank check device also saves the rough quality problems due to waste of machining time, increase overall efficiency. Therefore, the refinement of rough is to improve the productivity of the most promising way out. For the engine block production line, can be rough in parts on-line pre-milling six face, removing most of the margin, to facilitate direct on-line parts.3.2 machining process selection and processing of the benchmark Choose the right processing technology base is directly related to the processing quality can ensure the parts. Generally speaking, process benchmarking can be divided into coarse and fine reference base.(1) The baseline for the on-line thick rough, which is particularly important the choice of benchmark crude, if crude benchmark choice unreasonable, will the uneven distribution of machining allowance, processing and surface offsets, resulting in waste. In the cylinder production line, we have adopted for the coarse side of the base;(2) refined the base of this box for the engine block parts, the general use of “side two sales” for a full range of uniform benchmarks. For the longer automated production line system, due to pin holes in the course of the wear and tear caused by inaccurate positioning, therefore, will be divided into 2-3 segment pin holes used. In the cylinder pin hole of the process, we have adopted to the side, bottom and the spindle hole positioning, in the processing center on the process.3.3 Machining Processing Stages and processes of the arrangements Often a part of many apparent need for processing, of course, the surface machining accuracy are different. Processing of high precision surface, often after repeated processing; As for the processing of the surface of low precision, only need to go through one or two on the list. Thus, when the development process in order to seize the “processing high precision surface,”this conflict, the reasonable arrangement processes and rational division stage of processing. Arrange the order of the principle of process is: after the first coarse refined, the first surface after the hole, the first benchmark other. In the engine block machining, the same should follow this principle.(1) roughing stage engine block machining process, the arrangements for roughing process, to fully carry out rough rough, trim most of the margin in order to ensure production efficiency;(2) semi-finishing phase of the engine block machining, in order to ensure the accuracy of some important surface processing, and arrange some semi-finishing operations, will be required accuracy and surface roughness of the surface of the middle of some processing to complete, while demanding the surface of semi-finished, to prepare for future finishing;(3) The finishing stage of requiring high accuracy and surface roughness of the surface processing;(4) secondary processing, such as small surface screw holes, you can finish of the major surface after the one hand, when the workpiece deformation process little impact at the same time also reduced the rejection rate; In addition, if the main surface of a waste, these small the surface will not have to be processed, thus avoiding a waste of man-hours. However, if the processing is very easy for a small surface bumps the main surface, it should be placed on a small surface finish prior to the main surface finishing;(5) should make proper arrangements for secondary processes such as product inspection process, in part roughing stage, the key process before and after processing, spare parts all the processing has been completed, should be appropriate arrangements. Stage of processing division, has the following advantages: First, it can take measures to eliminate the rough workpiece after the stress, to ensure accuracy; second, finishing on the back, and will not damage during transport the surface of the workpiece has been processed; again, first roughing the surface defects can be detected early and promptly deal with rough, do not waste working hours. But most small parts, do not sub very thin.3.4 cylinder surface of the main processing and secondary processes Cylinder surface and support the main processing operations are:(1) plane processing At present, the milling of engine blocks is the primary means of planar processing, domestic milling feed rate is generally 300-400mm/min, and foreign 2000-4000mm/min milling feed rate compared to far cry, to be on increasing, therefore, improve the milling feed rate, reduce overhead time is to improve the productivity of the major means of finishing a number of plane engine block when the milling feed rate to reach 2399 mm / min, greatly improved efficiency;Top surface of the cylinder milling is a key process in the process, the flatness requirements for 0.02/145mm, the surface roughness of Ra1.6um. Processing in the cylinder, the use of side and spindle bearing bore positioning, top, bottom and middle vagay only aperture while processing used in the processing line outside of the knife device can better meet the engine block machining accuracy ;(2) General holes machining holes in general are still using the traditional processing of drilling, expansion, boring, reaming, tapping and other craft approach. Issues in the design process of specific programs, use of coated cutting tools, cutting tools and other advanced tools within the cooling, and using a large flow of cooling systems, greatly improving the cutting speed, improved productivity;(3) deep hole processing of the traditional processing method is used to grade twist drill feed, low efficiency of their production, processing and quality is poor. The deep hole in the engine block processing, the use of gun drilling process;(4) The three-axis machining holes for the cylinder-axis machining holes holes of high precision, long working hours of the restrictive process. Thus, work arrangements, processing methods, tools and so on should be special attention. All cover pre-processing, that is, semi-circular hole and the cylinder block main bearing cap of the shortage of processing, its main purpose is to remove blank margin, release stress, to prepare for the post-order processing; in crankshaft machining processing center hole, using double-sided Boring, boring the first holes in the crankshaft hole at one end to 1 / 2 length, and then turn 180 degrees workbench, from the other end and then bore another 1 / 2 length.(5) The cylinder bore machining cylinder hole cylinder machining processing is a key process in the one, under normal circumstances, the machining process as a rough boring, semi-fine boring, precision boring and honing. Cylinder bore wall for the early detection of casting defects, eliminate stress, should be thick cylinder boring holes in advance; due to the structural characteristics of the different cylinder bore, must be in honing process to improve the cylinder bore surface quality. In the high-volume production, the cylinder bore honing generally use the multi-axis grinding machine or honing Automatic Line. Here we use honing automatic lines, from the coarse-heng. Fine-heng and testing equipment, composed of three;(6) Cleaning Cleaning is divided into wet cleaning and dry cleaning. Machining cylinder automatic production line using a large flow of wet cleaning;(7) Detect points outside the line detection and line detection of