小型手推式播种机毕业设计说明书

北华大学学士学位论文小型多功能精密播种机的设计摘要本设计是根据国内外播种机的发展趋势通用性和适应性不断提高以及本着结构简单操作灵活的原则，而设计的一种能完成播种工作的小型多功能精密播种机。该机结构上优点，使之能适应各种田地的播种。小到1-2分大的田块，大到上百亩的田块，不管是平坝、还是浅丘地区；无论是板结的土质，还是疏松的土质都能适应。还可以根据用户的不同需求，配置合适的播种器。通过调节犁铧和种子储存孔的行距，能够轻松地播种小麦、大麦、高粱、大豆、玉米等旱粮作物。本例着重对播种机排种器、监控装置等结构进行设计选择。关键词：精密播种播种机播种北华大学学士学位论文AbstractThedesignisbasedonthedevelopmenttrendsandseeder,interoperabilityandadaptabilityinaconstantlyimprovingthestructureandoperationofflexiblesimpleprinciplesdesignedtosimultaneouslyaccomplishasmallplantingfertilizationworkmultifunctionalsophisticatedseeder.Thisstructuraladvantagessothattheycanadapttoavarietyoffieldsplanting.Applicabletoallsizesofland;Whetherplainsorhills;Whetherhardsoilorloosesoil.Wecanselecttheplantingmachineaccordingtothedifferentneedsofusers.Byregulatingplatoonofvehiclesandplowcaneasilysowwheat,barley,sorghum,soybean,cornandothercrops.Thisexamplefocusesonthedesignseederplatoonofvehicles,fertilizationdevices,trenchingvehiclesstructure.Keywords:precisionplantingseederplanting北华大学学士学位论文目录第一章绪论...............................................................................................................11.1本课题的项目背景及研究意义.......................................................................11.2国内外发展概况...............................................................................................31.2.1国内发展概况..........................................................................................31.2.2国外发展概况..........................................................................................31.3课题研究的主要内容.......................................................................................31.3.1主要内容...................................................................................................................31.3.2技术要求...................................................................................................................31.3.3关于题目的具体要求...............................................................................................31.4设计方法和技术路线.....................................................错误!未定义书签。第二章冲压工艺分析.................................................................................................42.1工艺性分析.......................................................................................................92.2本题弯曲工艺中的关键问题...........................................错误!未定义书签。2.2.1弯曲件的弹性回跳..................................................错误!未定义书签。2.2.2中性层位置的内移..................................................错误!未定义书签。2.2.3弯曲区板料厚度的变薄..........................................错误!未定义书签。2.2.4板料长度的增加......................................................错误!未定义书签。2.2.5板料横截面的畸变、翘曲和拉裂..........................错误!未定义书签。2.3本题模具采用设计方案..................................................错误!未定义书签。2.4冲模设计的步骤和内容...................................................错误!未定义书签。2.5确定冲压工艺方案...........................................................错误!未定义书签。2.5.1设计毛坯尺寸和形状..............................................错误!未定义书签。2.5.2工序图的确定..........................................................错误!未定义书签。2.5.3确定搭边值和排样..................................................错误!未定义书签。2.5.4冲裁凸、凹模间隙..................................................错误!未定义书签。2.5.5计算冲孔模尺寸......................................................错误!未定义书签。2.6计算各工序冲压力和选择冲压设备...............................错误!未定义书签。2.6.1冲孔过程中冲压力的计算......................................错误!未定义书签。2.6.2各次弯曲弯曲力计算..............................................错误!未定义书签。2.6.3剪切过程中冲裁力的计算......................................错误!未定义书签。2.6.4卸料力的确定.........................................................错误!未定义书签。2.6.5推件力的确定..........................................................错误!未定义书签。2.6.6顶件力的确定.........................................................错误!未定义书签。北华大学学士学位论文2.6.7初选压力机..............................................................错误!未定义书签。第三章各部分模具结构和整体设计.......................................................................333.1模具结构型式...................................................................错误!未定义书签。3.1.1定位方式的选择......................................................错误!未定义书签。3.2工作零件尺寸及结构.................................................错误!未定义书签。3.2.1冲裁凸模..................................................................错误!未定义书签。3.2.2冲裁凹模..................................................................错误!未定义书签。3.2.3凹模、凸模的固定..................................................错误!未定义书签。3.2.4冲裁凸凹模工作部分的计算公式..........................错误!未定义书签。3.2.5弯曲模.....................................................................错误!未定义书签。3.3定位零件..........................................................................错误!未定义书签。3.3.1.导料板....................................................................错误!未定义书签。3.3.2.挡料销....................................................................错误!未定义书签。3.3.3.导料销....................................................................错误!未定义书签。3.4卸料、压料和推顶件装置..............................................错误!未定义书签。3.4.1.卸料装置....................................