遥控器塑料模具设计及三维建模【8张图纸/11500字】【优秀机械毕业设计论文】

资源目录

遥控器塑料模具设计及三维建模【】【优秀机械毕业设计论文】.rar

毕业设计.doc---(点击预览)

毕业答辩.ppt---(点击预览)

外文翻译.doc---(点击预览)

A0-装配图.dwg

A0-零件图-6张.dwg

A3-塑件图.dwg

压缩包内文档预览：(预览前20页/共43页)

编号：598210 类型：共享资源大小：5.72MB 格式：RAR 上传时间：2016-02-25 上传人：木*** IP属地：江苏

50
积分

版权申诉 word格式文档无特别注明外均可编辑修改；预览文档经过压缩，下载后原文更清晰！ 立即下载

关键词：: 遥控器塑料模具设计三维建模优秀优良机械毕业设计论文

资源描述：

文档包括:
说明书一份。42页。11500字左右。
任务书一份。
毕业答辩一份。
外文翻译一份。

图纸共8张，如下所示
A0-装配图.dwg
A0-零件图-6张.dwg
A3-塑件图.dwg

毕业任务书

一、题目
塑料模具设计及三维建模
二、指导思想和目的要求
（1）综合运用本专业所学课程的理论和生产实际知识，进行塑料模具设计的实际训练，从而培养学生独立工作的能力，提高学生的实际分析能力和创新意识。（2）加深学生对塑料模具设计基本理论的理解，培养学生设计和实践能力的重要环节和必要手段，培养学生设计塑料模具的能力。其目的是使学生全面了解与掌握注射模具的组成、结构、动作原理及其设计方法与步骤等。
（3）培养学生将所学的模具知识、零件设计、制图、工艺、公差与技术测量等知识有机地结合在一起，提高学生对模具零件设计、制图、等知识与技能的综合掌握与应用能力，培养其严谨的实验态度和分析解决问题的能力。
（4）掌握零件设计与加工的基本技能，如计算、绘图、查阅设计资料和手册，熟悉标准和规范等
三、主要技术指标
(1) 模具的结构设计
(2) 用CAD软件绘制装配图和部分零件的2D图；
(3) 用UG软件绘制装配图和零件的3D图；
(4) 毕业论文撰写规范、论述清楚、文字精炼、计算准确，还应附有必要的插图

四、进度和要求
第1～2周收集资料，分析并绘制遥控器底壳图且确定其注塑工艺方案，并完成开题报告
第3周完成设计的总目录
第4～5周对零件工艺分析确定零件尺寸与工艺参数
第6～7周模具结构设计及其模具设计
第8～9周基本完成理论设计
第10～12周绘制相关二维图，三维总装图，及其动态仿真。
第13～15周完成论文，并对论文进行修改完善
第16周准备好PPT进行答辩。

五、主要参考书及参考资料
[1] 张荣清模具设计与制造。高等教育出版社，2003.8（1）
[2] 彭建声模具设计与加工速查手册。机械工业出版社，2012.7（2）
[3] 熊建武，吴林峰，龙华模具零件工艺设计项目教程。北京理工大学出版社，2011.12（1）
[4] 陈晓东 UG NX8.0模具设计完全学习手册。电子工业出版社，2012.5（1）
[5] 李奇，朱江峰，江莹模具构造与制造。清华大学出版社，2004.9（1）
[6] 李波 AutoCAD 2011 机械设计完全自学手册。机械工业出版社，2011.6（1）
[7] 李志国 UG NX 6中文版基础教程。清华大学出版社，2009.5（1）
[8] 田光辉林红旗模具设计与制造。北京大学出版社，2009.9（1）

摘要

本次毕业设计的课题为遥控器底壳的注射成型模具设计，主要从遥控器底壳材料特性、成型性能及遥控器底壳的形状、型腔结构等多角度详细分析了遥控器底壳注塑加工工艺性。因产品为大批量生产，且零件体积较大、结构较为简单，故采用“一模2件”的生产方式。初步选择注塑机的型号和规格，分析遥控器底壳结构及生产方式宜采用单分型结构，对浇注系统、成型零部件、导向及定位机构、脱模机构、冷却系统、模架各部件零件都进行了相关的计算和选择。最后，在参照遥控器底壳的体积、重量等参数后对注塑机的相关主要参数进行校核，以判断所选的注塑机能否满足注塑要求。

关键词：注射成型，一模两件，单分型面，注塑机

ABStract

The graduation design subject to cover the injection molding design, mainly from the plastic material characteristics, forming performance and plastic parts, die-cavity structure is analyzed in detail from multiple perspectives, such as plastic injection molding process technology. Because there is no batch production requirements, and small parts, simple structure, a mold piece of the means of production. Preliminary selection of type and specification, injection molded parts structure analysis and production mode, appropriate USES double type structure, gating system, forming parts, orientation and positioning and demoulding mechanism, cooling system, formwork components parts are made of calculation and choice. Finally, in the reference of the volume, weight after injection parameters such as the main parameters related to test to determine whether meet the selected injection molding requirements.
Key words：Injection molding; Mold One; Duplex profile; Injection molding machine;

第一章绪论 - 7 -
第二章遥控器底壳的工艺性分析 - 9 -
2.1 遥控器底壳的原材料分析 - 9 -
2.2 成型特性及条件 - 9 -
2.3 遥控器底壳的结构和尺寸精度及表面质量分析 - 10 -
2.3.1结构分析 - 10 -
2.3.2尺寸精度分析 - 11 -
2.3.3表面质量分析 - 11 -
2.4 计算遥控器底壳的体积和重量 - 11 -
2.5 最大注射量的校核 - 11 -
2.6 注射压力的校核 - 12 -
2.7 开模行程相关尺寸校核 - 12 -
2.8 锁模力的校核 - 13 -
第三章初选注射成型机的型号和规格 - 14 -
3.1 注射成型机的型号和规格 - 14 -
3.2 遥控器底壳注射工艺参数的确定 - 15 -
第四章注射模的结构设计 - 16 -
4.1 分型面的选择 - 16 -
4.2 确定型腔数目及排列方式 - 17 -
4.3 浇注系统设计 - 17 -
4.3.1主流道设计 - 18 -
4.3.2分流道设计 - 18 -
4.3.3浇口设计 - 19 -
4.3.4浇口套及定位环设计 - 19 -
4.4 成型零件结构设计 - 19 -
4.4.1型腔工作尺寸的计算 - 20 -
4.4.2型腔侧壁厚度和底板厚度计算 - 21 -
4.5 导向及定位机构设计 - 22 -
4.5.1导向机构的设计 - 22 -
4.5.2导柱导套材料的选择和热处理 - 23 -
4.6 脱模机构设计 - 23 -
4.6.1脱模力计算 - 23 -
4.6.2脱模机构的选择与设计 - 24 -
4.6.3推出机构的复位 - 25 -
4.7 冷却系统设计 - 25 -
4.7.1冷却系统的设计原则 - 25 -
4.7.2冷却回路的设计 - 25 -
4.8 模架 - 26 -
第五章注射机有关参数的校核 - 27 -
5.1 模具外形尺寸的校核 - 27 -
5.2 模具厚度校核 - 27 -
5.6 注射机定位孔与模具浇口套外圈配合的校核 - 27 -
总结 - 38 -
参考文献 - 39 -
谢辞 - 41 -
毕业设计小结 - 42 -

遥控器塑料模具设计及三维建模

内容简介：: 毕业设计（论文）英文资料翻译Chinas mold industry and its development trend学院：西北工业大学明德学院专业：机械设计制造及自动化班级： 16004班姓名：陈天祺指导老师：雷玲 2014年 4 月附录1 外文原文Chinas mold industry and its development trend The mold is the manufacturing industry important craft foundation, in our country, the mold manufacture belongs to the special purpose equipment manufacturing industry. China although very already starts to make the mold and the use mold, but long-term has not formed the industry. Straight stabs 0 centuries 80s later periods, the Chinese mold industry only then drives into the development speedway. Recent years, not only the state-owned mold enterprise had the very big development, the three investments enterprise, the villages and towns (individual) the mold enterprises development also quite rapid .Although the Chinese mold industrial development rapid, but compares with the demand, obviously falls short of demand, its main gap concentrates precisely to, large-scale,complex, the long life mold domain. As a result of in aspect and so on mold precision, life, manufacture cycle and productivity, China and the international average horizontal and the developed country still had a bigger disparity, therefore, needed massively to import the mold every year .The Chinese mold industry except must continue to sharpen the productivity, from now on will have emphatically to the profession internal structure adjustment and the state-of-art enhancement. The structure adjustment aspect, mainly is the enterprise structure to the specialized adjustment, the product structure to center the upscale mold development, to the import and export structure improvement, center the upscale automobile cover mold forming analysis and the structure improvement, the multi-purpose compound mold and the compound processing and the laser technology in the mold design manufacture application, the high-speed cutting, the superfinishing and polished the technology, the information direction develops .The recent years, the mold profession structure adjustment and the organizational reform step enlarges, mainly displayed in, large-scale, precise, complex, the long life, center the upscale mold and the mold standard letter development speed is higher than the common mold product; The plastic mold and the compression casting mold proportion increases; Specialized mold factory quantity and its productivity increase; The three investments and the private enterprise develops rapidly; The joint stock system transformation step speeds up and so on. Distributes from the area looked, take Zhujiang Delta and Yangtze River delta as central southeast coastal area development quickly to mid-west area, south development quickly to north. At present develops quickest, the mold produces the most centralized province is Guangdong and Zhejiang, places such as Jiangsu, Shanghai, Anhui and Shandong also has a bigger development in recent years .Although our country mold total quantity had at present achieved the suitable scale, the mold level also has the very big enhancement, after but design manufacture horizontal overall rise and fall industry developed country and so on Yu De, America, date, France, Italy many. The current existence question and the disparity mainly display in following several aspects:(1) The total quantity falls short of demand Domestic mold assembling oneself rate only ,about 70%. Low-grade mold , center upscale mold assembling oneself rate only has 50% about .(2) The enterprise organizational structure, the product structure, the technical structure and the import and export structure does not gatherIn our country mold production factory to be most is from the labor mold workshop which produces assembles oneself (branch factory), from produces assembles oneself the proportion to reach as high as about 60%, but the overseas mold ultra 70% is the commodity mold. The specialized mold factory mostly is large and complete, small and entire organization form, but overseas mostly is small but, is specially small and fine. Domestic large-scale, precise, complex, the long life mold accounts for the total quantity proportion to be insufficient 30%, but overseas in 50% above 2004 years, ratio of the mold import and export is 3.7:1, the import and export balances the after net import volume to amount to 1.32 billion US dollars, is world mold net import quantity biggest country .(3) The mold product level greatly is lower than the international standardThe production cycle actually is higher than the international water broad product level low mainly to display in the mold precision, cavity aspect and so on surface roughness, life and structure .(4) Develops the ability badly, economic efficiency unsatisfactory.Our country mold enterprise technical personnel proportion low the level is lower, also does not take the product development, frequently is in the passive position in the market. Our country each mold staff average year creation output value approximately ,ten thousand US dollars, overseas mold industry developed country mostly 15 to 20 thousand US dollars, some reach as high as 25 to 30 thousand US dollars, relative is our country quite part of molds enterprises also continues to use the workshop type management with it, truly realizes the enterprise which the modernized enterprise manages few To create the above disparity the reason to be very many, the mold long-term has not obtained the value besides the history in as the product which should have, as well as the most state-owned enterprises mechanism cannot adapt the market economy, but also has the following several reasons: .(1) Country to mold industry policy support dynamics also insufficientlyAlthough the country already was clear about has promulgated the mold profession industrial policy, but necessary policy few, carried out dynamics to be weak. At present enjoyed the mold product increment duty enterprise nation 185, the majority enterprise still the tax burden is only overweight. The mold enterprise carries on the technological transformations introduction equipment to have to pay the considerable amount the tax money, affects the technology advancement, moreover privately operated enterprise loan extremely difficult .(2) Talented person serious insufficient, the scientific research development and the technical attack investment too urine Mold profession is the technology, the fund, the work crowded industry, along with the time progress and the technical development, grasps the talented person which and skilled utilizes the new technology exceptionally short, the high-quality mold fitter and the enterprise management talent extremely is also anxious. Because the mold enterprise benefit unsatisfactory and takes insufficiently the scientific research development and the technical attack, the scientific research unit and the universities, colleges and institutes eye stares at is creating income, causes the mold profession invests too few in the scientific research development and the technical attack aspect, causes the mold technological development step not to be big, progresses not quick .(3) The craft equipment level to be low, also necessary is not good, the use factor low recent years our country engine bed profession progressed quickly, has been able to provide the quite complete precision work equipment, but compared with the overseas equipment, still had a bigger disparity. Although the domestic many enterprises have introduced many overseas advanced equipment, but the overall equipment level low are very more than the overseas many enterprises. As a result of aspect the and so on system and fund reason, introduces the equipment not not necessary, the equipment and the appendix not necessary phenomenon are extremely common, the equipment utilization rate low question cannot obtain the comparatively properly solution for a long time .(4) Specialization, standardization, commercialized degree low, the cooperation ability Because receives large and complete small and entire the influence since long ago, mold specialization level low, the specialized labor division is not careful, the commercialized degree is low. At present domestic every year produces mold, commodity mold minister 40% About, other for from produce uses for oneself. Between the mold enterprise cooperates impeded, completes the comparatively large-scale mold complete task with difficulty. Mold standardization level low, mold standard letter use cave rare is low also to the mold quality, the cost has a more tremendous influence, specially has very tremendous influence .(5) To the mold manufacture cycle) the mold material and the mold correlation technology falls The mold material performance, the quality and the variety question often can affect the mold quality, the life and the cost, the domestically produced molding tool steel and overseas imports the steel products to compare has a bigger disparity. Plastic, plate, equipment energy balance, also direct influence mold level enhancement .At present, our country economy still was at the high speed development phase, on the international economical globalization development tendency is day by day obvious, this has provided the good condition and the opportunity for the our country mold industry high speed development. On the one hand, the domestic mold market will continue high speed to develop, on the other hand, the mold manufacture also gradually will shift as well as the transnational group to our country carries on the mold purchase trend to our country extremely to be also obvious. Therefore, will take a broad view the future, international, the domestic mold market overall development tendency prospect will favor, estimated the Chinese mold will obtain the high speed development under the good market environment, our country not only can become the mold great nation, moreover certainly gradually will make the powerful nation to the mold the ranks to make great strides forward. 15 period, the Chinese mold industry level not only has the very big enhancement in the quantity and the archery target aspect, moreover the profession structure, the product level, the development innovation ability, enterprises system and the mechanism as well as the technology advancement aspect also can obtain a bigger development .The mold technology has gathered the machinery, the electron, chemistry, optics, the material, the computer, the precise monitor and the information network and so on many disciplines, is a comprehensive nature multi-disciplinary systems engineering. The mold technology development tendency mainly is the mold product to larger-scale, preciser, more complex and a more economical direction develops, the mold product technical content unceasingly enhances, the mold manufacture cycle unceasingly reduces, the mold production faces the information, is not having the chart, is fine, the automated direction develops, the mold enterprise to the technical integration, the equipment excellent, is producing approves the brand, the management information, the management internationalization direction develops. Our country mold profession still will have to enhance from now on the general character technology had :(1) To establish in the CAD/CAE platform the advanced mold design technology, enhances modernization which the mold designed, information, intellectualization, standardized level .(2) Establishes in the CAM/CAPP foundation the advanced mold processing technology and the advanced manufacture technology unifies, raises the automated level and the production efficiency which the mold processes .(3) The mold production enterprises information management technology. For example PDM (product data management), ERP (enterprise resource management), MIS (mold manufacture management information system) and information network technology the and so on INTERMET platform application, the promotion and the development .(4) Are high speed, Gao Jing, the compound mold processing technology research and the application. For example the ultra fine ramming mold manufacture technology, the precise plastic and the compression casting mold manufacture technology and so on .(5) Enhances the mold production efficiency, reduces the cost and reduces the mold production cycle each kind of fast economical mold manufacture technology .(6) The advanced manufacture technology application. For example hot technology and so on flow channel technology, gas auxiliary technology, hypothesized technology, nanotechnology, rapid scanning technology, reversion project, parallel project in the mold research, the development, the processing process application .(7) The raw material the simulation technology which forms in the mold .(8) The advanced mold processing and the appropriation equipment research and the development .(9) The mold and the mold standard letter, the important auxiliary standardized technology .(10) The mold and its the product examination technology.(11) High quality, the new mold material research and the development and its the correct application .(12) The mold production enterprises modern management technology Mold profession in 十15 period needs to solve the key essential technology should be the mold information, the digitized technology and precise, ultra fine, high speed, the highly effective manufacture technology aspect breakthrough Along with the national economy total quantity and the industry product technology unceasing development, all the various trades and occupations to the mold demand quantity more and more big, the specification more and more is also high.Although mold type many, but its development should be with emphasis both can meet the massive needs, and has the comparatively high-tech content, specially at present domestic still could not be self-sufficient, needs the massive imports the mold and can represent the development direction large-scale, precise, is complex, the long life mold. The mold standard letter type, the quantity, the level, the production a and so on have the significant influence to the entire mold profession development. Therefore, some important mold standard letters also must the prioritize, moreover its development speed should quickly to the mold development speed, like this be able unceasingly to raise our country mold standardization level, thus improves the mold quality, reduces the mold production cycle, reduces the cost. Because our country mold product holds the bigger price superiority in the international market, therefore regarding the exportation prospect good mold product also should take key develops. According to the above required quantity big, the technical content is high, represents the development direction, the export prospect good principle choice prioritize product, moreover chooses the product to have at present to have the certain technology base, belongs has the condition, has the product which the possibility develops .According to 十15 the mold profession development plan, 十15 the period mold product development mainly has following several kind of the automobile cover mold (1)Ramming mold to occupy The mold total quantity dish with emphasis above 40%. Automobile cover mold mainly for automobile necessary, also includes for the agriculture with the vehicle, the project machinery and the farm machinery necessary cover mold, it has the very big representation in the ramming mold, the mold mostly is large and middle scale, structure complex, the specification is high. For the passenger vehicle necessary cover mold, the request is in particular higher, may represent the ramming mold the level. This kind of mold our country had the certain technology base, already for middle-grade passenger vehicle necessary, but the level is not high, the ability is insufficient, at present satisfying rate only has one about the half. Center the upscale passenger vehicle cover mold main dependence import, has become the bottleneck which the automobile develops, enormous influence vehicle type development .(2)The precise ramming mold Multi- locations level was entering the mold and fine represents the ramming mold development direction, the precision request life request has been extremely high, mainly for the electronics industry, the automobile, the instrument measuring appliance, the electrical machinery electric appliance and so on formed a complete set. These two kind of molds, domestic had the suitable foundation, and has introduced the overseas technology and the equipment, the individual enterprise produces the product has achieved the world level, but the majority of enterprises still had a bigger disparity, the supply total quantity insufficient, the import were very many (3) The large-scale precise plastic mold Plastic mold accounts for the mold total quantity 10%, moreover this proportion also is rising. In the plastic mold necessary large-scale casts the mold for the automobile and the electrical appliances, necessary models for the integrated circuit seals the mold, for the electronic information industry and the machinery and the packing necessary multilayer, the multi- cavities, the multi- material qualities, the multicolor precise note , and saves water the agricultural necessary plastic different molding for the new building materials to squeeze out the mold and the pipeline and the nozzle mold and so on, at present although had the suitable technology base and fast is developing, but the technical level and overseas still had a bigger disparity, the total quantity falls short of demand, Every year import amount reaches several hundred million US dollar.(4) The main mold standard to imitatee At present domestically to have an greater output the mold standard letter mainly is the mold frame, the guidance, the throwout lever pushes the tube, the elastic part and so on. These products not only the domestic necessary massive need, the exportation prospect very is also good, should continue vigorously to develop. The nitrogen cylinder and the hot flow channel part main dependence import, should raise the level in the existing foundation, forms the standard and organization scale production.(5) The other high-tech content molds Occupiesin the mold total quantity green 8% compression casting mold, large-scale thin wall precise compression casting technology content high, the difficulty is big. The magnesium alloy compression casting mold at present although just started, but the prospects for development were good, have the representation. The meridian rubber tire mold also is the development direction, detachable mold technology difficulty is biggest. With fast takes shape some fast pattern making technologies and the corresponding fast economical mold which the technology unifies has the very good prospects for development. These high-tech content molds in 十15 period also should the prioritize .附录2：中文翻译我国模具工业现状及发展趋势模具是制造业的重要工艺基础，在我国，模具制造属于专用设备制造业。中国虽然很早就开始制造模具和使用模具，但长期未形成产业。直到20世纪80年代后期，中国模具工业才驶入发展的快车道。近年，不仅国有模具企业有了很大发展，三资企业、乡镇（个体）模具企业的发展也相当迅速。虽然中国模具工业发展迅速，但与需求相比，显然供不应求，其主要缺口集中于精密、大型、复杂、长寿命模具领域。由于在模具精度、寿命、制造周期及生产能力等方面，中国与国际平均水平和发达国家仍有较大差距，因此，每年需要大量进口模具。中国模具产业除了要继续提高生产能力，今后更要着重于行业内部结构的调整和技术发展水平的提高。结构调整方面，主要是企业结构向专业化调整，产品结构向着中高档模具发展，向进出口结构的改进，中高档汽车覆盖件模具成形分析及结构改进、多功能复合模具和复合加工及激光技术在模具设计制造上的应用、高速切削、超精加工及抛光技术、信息化方向发展。近年，模具行业结构调整和体制改革步伐加大，主要表现在，大型、精密、复杂、长寿命、中高档模具及模具标准件发展速度高于一般模具产品；塑料模和压铸模比例增大；专业模具厂数量及其生产能力增加；“三资”及私营企业发展迅速；股份制改造步伐加快等。从地区分布来看，以珠江三角洲和长江三角洲为中心的东南沿海地区发展快于中西部地区，南方的发展快于北方。目前发展最快、模具生产最为集中的省份是广东和浙江，江苏、上海、安徽和山东等地近几年也有较大发展。虽然我国模具总量目前已达到相当规模，模具水平也有很大提高，但设计制造水平总体上落后于德、美、日、法、意等工业发达国家许多。当前存在的问题和差距主要表现在以下几方面：（1）总量供不应求国内模具自配率只有70%左右。其中低档模具供过于求，中高档模具自配率只有50%左右。（2）企业组织结构、产品结构、技术结构和进出口结构均不合理我国模具生产厂中多数是自产自配的工模具车间（分厂），自产自配比例高达60%左右，而国外模具超过70%属商品模具。专业模具厂大多是“大而全”、“小而全”的组织形式，而国外大多是“小而专”、“小而精”。国内大型、精密、复杂、长寿命的模具占总量比例不足30%，而国外在50%以上。2004年，模具进出口之比为3.7:1，进出口相抵后的净进口额达13.2亿美元，为世界模具净进口量最大的国家。（3）模具产品水平大大低于国际水平，生产周期却高于国际水平产品水平低主要表现在模具的精度、型腔表面粗糙度、寿命及结构等方面。（4）开发能力较差，经济效益欠佳我国模具企业技术人员比例低，水平较低，且不重视产品开发，在市场中经常处于被动地位。我国每个模具职工平均年创造产值约合1万美元，国外模具工业发达国家大多是1520万美元，有的高达2530万美元，与之相对的是我国相当一部分模具企业还沿用过去作坊式管理，真正实现现代化企业管理的企业较少。造成上述差距的原因很多，除了历史上模具作为产品长期未得到应有的重视，以及多数国有企业机制不能适应市场经济之外，还有下列几个原因：（1）国家对模具工业的政策支持力度还不够虽然国家已经明确颁布了模具行业的产业政策，但配套政策少，执行力度弱。目前享受模具产品增值税的企业全国只有185家，大多数企业仍旧税负过重。模具企业进行技术改造引进设备要缴纳相当数量的税金，影响技术进步，而且民营企业贷款十分困难。（2）人才严重不足，科研开发及技术攻关投入太少模具行业是技术、资金、劳动密集的产业，随着时代的进步和技术的发展，掌握并且熟练运用新技术的人才异常短缺，高级模具钳工及企业管理人才也非常紧张。由于模具企业效益欠佳及对科研开发和技术攻关重视不够，科研单位和大专院校的眼睛盯着创收，导致模具行业在科研开发和技术攻关方面投入太少，致使模具技术发展步伐不大，进展不快。（3）工艺装备水平低，且配套性不好，利用率低近年来我国机床行业进步较快，已能提供比较成套的高精度加工设备，但与国外装备相比，仍有较大差距。虽然国内许多企业已引进许多国外先进设备，但总体的装备水平比国外许多企业低很多。由于体制和资金等方面的原因，引进设备不配套，设备与附件不配套现象十分普遍，设备利用率低的问题长期得不到较妥善的解决。（4）专业化、标准化、商品化程度低，协作能力差由于长期以来受“大而全”“小而全”影响，模具专业化水平低，专业分工不细致，商品化程度低。目前国内每年生产的模具，商品模具只占40%左右，其余为自产自用。模具企业之间协作不畅，难以完成较大规模的模具成套任务。模具标准化水平低，模具标准件使用覆盖率低也对模具质量、成本有较大影响，特别是对模具制造周期有很大影响。（5）模具材料及模具相关技术落后模具材料性能、质量和品种问题往往会影响模具质量、寿命及成本，国

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。