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    AWC机架现场扩孔机设计开题报告.doc

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    AWC机架现场扩孔机设计开题报告.doc

    开题报告该课题为:AWC机架现场扩孔机,要求扩机架上两孔分别至420mm和520mm,属于较大孔切削加工且机架较为庞大笨重,因此只有利用刀具完成进给切削加工,采用专用镗床加工。1、本课题的研究意义,国内外研究现状、水平和发展趋势。研究意义:专用镗床主要用于大批量大件生产,具有生产率高,能加工大型难加工零件,且结构简单,制造成本低等特点。镗床的发展:在1770年前后,由于用手工和一般金属加工机具加工蒸汽机气缸不能到达精度要求,人们就创制了专门加工蒸汽机气缸孔的专业机床,于是就诞生了第一台卧式镗床。到了二十世纪初,又相继出现了加工各种复杂大型零件的坐标镗床。由于加工零件的不断变化,促进了镗床的不断发展完善。终于发展成为今天具有通用性、万年性的卧式镗床。对于重型制造业来说,那些体积大、吨位重的大型工件的孔加工,由于工件的移动和装夹困难,无法在普通卧式镗床上加工,因此,在卧式镗床的基础上又发展制造了重型落地镗床。镗床的不断进步和发展,已经说明本课题研究的重大意义。金属切削加工在这整个机械制造中占有极重的位置,约占机械制造总工作量的4060。现代机器向着高速度、高效率、高精度发向发展,对机械零件精度要求越来越高,同时机构也日趋复杂,特别是箱体零件具有空系多的特点她除了本身有尺寸精度要求外,还有形状精度和空系之间的位置精度要求。镗床在这些加工中由为重要。现代还出现了一些生产能力强柔性不高的专用镗床。如用了大批量生产连杆轴瓦、活塞孔、油泵壳体等零件上的专门加工精密孔的金刚镗床。2、本课题的基本内容,预计可能遇到的困难,提出解决问题的方法和措施。本课题的基本内容:总体方案设计;能力参数计算;机械滑台设计;扩孔机传动系统设计;镗杆稳定性校核。本课题的难点:在于扩孔机升降运动准确定位;各类切削用量选择;镗杆结构设计及稳定性校核。利用行程开关限位及定位孔定位。刀杆形式的选择,可查相关资料,借鉴一些经验方案并进行强度校核,稳定性分析.3、本课题拟采用的研究手段和可行性分析。主要查阅各类相关设计手册,利用类比法和逻辑推理法进行研究,并到工厂进行参观实习,向工人师傅请教各类生产实践经验,结合理论,在指导老师的辅导下进行研究,在条件允许上午情况下借助实验进行论证.目录摘要·······································································错误!未定义书签。ABSTRACT······························································错误!未定义书签。1绪论···································································错误!未定义书签。1.1设计目的和意义·······························································错误!未定义书签。1.2扩孔技术要求··································································错误!未定义书签。1.3应解决的问题··································································错误!未定义书签。1.4设计项目的发展情况·························································错误!未定义书签。1.5设计原理·········································································错误!未定义书签。2总体设计······························································错误!未定义书签。2.1总体设计原则··································································错误!未定义书签。2.2工艺分析·········································································错误!未定义书签。2.3总体方案的比较·······························································错误!未定义书签。2.3.1刀杆的安装形式··························································错误!未定义书签。2.3.2进给方式···································································错误!未定义书签。2.3.3升降运动形式·····························································错误!未定义书签。2.3.4机床运动的分配··························································错误!未定义书签。2.3.5选择传动形式和支撑形式··············································错误!未定义书签。3力能参数计算························································错误!未定义书签。3.1镗削用量的选择及转矩、功率的确定原则······························错误!未定义书签。3.2最佳切削用量的选择·························································错误!未定义书签。3.2.1现有镗孔工艺参数·······················································错误!未定义书签。3.2.2镗削切削速度、扭矩和切削功率公式·······························错误!未定义书签。3.2.3主要镗削参数的计算····················································错误!未定义书签。3.3选择电机·········································································错误!未定义书签。4扩孔机传动系统设计··················································错误!未定义书签。4.1确定总传动比··································································错误!未定义书签。4.2分配传动装置的传动比······················································错误!未定义书签。4.3计算总的机械效率····························································错误!未定义书签。4.4计算传动装置各轴的运动和动力参数····································错误!未定义书签。4.5带传动设计·····································································错误!未定义书签。4.6传动斜齿轮的设计计算······················································错误!未定义书签。4.6.1选定齿轮类型、精度等级、材料及齿数····························错误!未定义书签。4.6.2按齿面接触强度设计····················································错误!未定义书签。4.6.4几何尺寸计算·····························································错误!未定义书签。4.6.5计算轴间圆柱斜齿轮···········································错误!未定义书签。4.6.6齿轮的结构设计··························································错误!未定义书签。4.7轴的结构设计··································································错误!未定义书签。4.7.1轴设计的主要内容·······················································错误!未定义书签。4.7.2轴的材料···································································错误!未定义书签。4.7.3轴的设计计算·····························································错误!未定义书签。4.7.4按扭转强度初步估算轴径··············································错误!未定义书签。4.7.5轴的机构设计·····························································错误!未定义书签。4.7.6求轴上的载荷······························································错误!未定义书签。4.7.7按弯扭合成应力校核的轴的强度······································错误!未定义书签。4.7.8精确校核轴的疲劳强度·················································错误!未定义书签。4.7.9对轴进行设计··························································错误!未定义书签。4.8对所有选用键进行强度校核················································错误!未定义书签。4.9对承受较大载荷的圆锥滚子轴承进行校核······························错误!未定义书签。4.10镗刀系统设计·································································错误!未定义书签。4.10.1镗刀头·····································································错误!未定义书签。4.10.2镗杆选择·································································错误!未定义书签。4.11箱体的结构设计······························································错误!未定义书签。5导轨设计······························································错误!未定义书签。6镗刀强度及镗杆的稳定性验算···································错误!未定义书签。7工艺试验······························································错误!未定义书签。结论······································································错误!未定义书签。参考文献······························································错误!未定义书签。附录A:E1立辊轧机机架加工工序图······························错误!未定义书签。附录B:E2立辊轧机机架加工工序图······························错误!未定义书签。致谢····································································错误!未定义书签。

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