拖拉机拨叉铣专机设计(卧式)说明书毕业论文.doc
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拖拉机拨叉铣专机设计(卧式)说明书毕业论文.doc
拖拉机拨叉铣专机(卧式)1目录1前言·····························································12总体方案论证······················································32.1被加工零件分析···············································32.2毛坯的选择···················································32.3基准选择·····················································52.4拟订机械加工工艺路线·········································52.5确定机械加工余量、工序尺寸及公差······························72.6选择机床设备及工艺装备·······································73金属切削用量的选择与计算····································83.1刀具的选择···················································83.2切削用量的选择以及计算·······································84机械传动装置的总体设计············································94.1分析和拟订传动装湖南工业大学本科生毕业设计(论文)2置···········································94.2减速机的选择················································94.3带轮的设计计算··············································105弹簧夹头的特点以及设计计算······································145.1弹簧夹头的介绍··············································155.2弹簧夹头的夹紧力的影响因素··································156轴的强度校核····················································166.1求轴上载荷··················································166.2绘制弯矩图和扭矩图··········································166.3弯矩合成强度校核············································166.4疲劳强度安全系数············································167结论······················································21参考文献······················································22致谢·································拖拉机拨叉铣专机(卧式)3·····················23附录······················································241前言某拖拉机厂是一家专门生产拖拉机及其零部件的厂,卧式X62W铣床是该厂用来铣削拖拉机拨叉脚厚度的机床。随生产规模不断扩大,产品质量要求不断提高,显然X62W铣床越来越不能满足要求和社会竞争性原则了。X62W铣床对于铣削大批量拖拉机拨叉,既不经济也不实惠。在生产拖拉机拨叉,X62W铣床不仅人工操作,工人劳动强度大,生产率低,而且工人技术水平也要求高。因此厂方必需培训专门的技术人员,工作过程是人工上料-人工定位-手动夹紧-开机-手动铣削-铣削完后关机-松开夹具-取下工件。从而耗费了大量的时间。由于频繁的开机关机对机器的损耗很大,多次的冲击也使刀具的使用寿命也大大减小了。人工定位、手动夹紧以及手动铣削使产品的精度降低,废品率的增大,从而使生产成本高,生产率低,迫切要求改变这种生产现状,设计X62W型卧式拨叉铣专机就是非曲直了解决这一问题的。X62W型卧式拨叉铣专机,主要用于拖拉机齿轮箱的拨叉脚厚度。此专机的工作过程是人工上料自动定位自动夹紧自动铣削,铣毕自动松开工件后由操作者取下。本课题来源于现某拖拉机制造股份有限公司。该公司在加工拖拉机齿轮箱的拨叉脚厚度时,利用卧式铣床X62W人工操作,工人劳动强度大,生产率低。随生产规模不断扩大,产品质量要求不断提高,迫切要求改变这种生产现状,因此他们需要一台拨叉铣专机,对这种专机的技术要求是:a.加工时该工件的主轴孔呈立式安置;b.工作节拍为每分钟加工20件;c.加工时,由操作员人工上料自动定位自动夹紧全速连续自动铣削;铣毕工件被自动松开,后由操作者取下并上下一个料(上料、下料时不停机);d.工件以其主轴孔定位,定位心轴置于圆盘工作台上,圆盘工作台主轴呈立式安置;e.专机工作安全、可靠,运行平稳,产品质量稳定,操作维护简单;f.专机结构紧凑,装料高度为800mm左右。在黄开有老师的指导下,首先进行了方案论证。经过研究和讨论,由于需设计的机床工作节拍为每分钟加工20件,因此要节省工件的上料时间。这就需要上料和铣加工同时进行。工件夹具设计时要用弹簧夹头来夹紧,工件的支撑台需湖南工业大学本科生毕业设计(论文)4要是一个大圆盘。另外还要设计一个凸轮机构来实现铣加工。另外工件的定位要精确。这样加工时就会实现人工上料自动定位自动夹紧全速连续自动铣削这个过程。在这样的设计效果下X62W型卧式拨叉铣专机可以使工作的效率大大的提高,生产过程安全、可靠,运行平稳,产品质量稳定,操作维护简单。改造后的X62W型卧式拖拉机拨叉铣专机在生产实践中将会得到有效的应用,而且会取得了良好的效果,在满足生产急需的前提下为企业创造了显著的经济效益。