课程设计 毕业设计 普通车床的主轴箱部件设计.doc

课程设计说明书 课程名称： 机械制造装备设计 设计题目： 普通车床的主轴箱部件设计 专 业： 机械设计及其自动化 学生姓名: 指导教师: 目录 一、运动设计············································1 1：确定变速范围R·················································1 2：确定转速级数····················································1 3：确定结构式······················································1 4：绘制转速图······················································1 5：确定各变速组传动副齿数··········································2 6：绘制传动系统图··················································3 二、动力计算··············································3 1：确定各轴转速····················································3 2：带传动设计······················································4 3：各传动组齿轮模数的确定和校核····································5 4：校核a传动组齿轮················································7 5：校核b传动组齿轮·················································7 6：主轴挠度的校核··················································8 7：轴的校核·························································9 8：主轴最佳跨距的确定··············································9 9：各传动轴支承处轴承的选择········································10 10：计算跨距·······················································10 三、心得体会·············································11 四、参考文献·············································11 一、设计目的 通过机床主运动机械变速传动系统得结构设计，在拟定传动和变速的结构方案过程中，得到设计构思、方案分析、结构工艺性、机械制图、零件计算、编写技术文件和查阅技术资料等方面的综合训练，树立正确的设计思想，掌握基本的设计方法，并具有初步的结构分析、结构设计和计算能力。 二、设计步骤 1.运动设计 1.1已知条件 [1]确定转速范围：主轴最小转速最大转速 [2]确定公比： [4] 最大加工直径250mm [5]主电动机功率P=4kw 根据已知条件可得变速范围Rn=nmax/nmin=22.3r/min 故Z=lgRn/lg+1=9 故转速级数： 1.2结构分析式 在降速传动中，防止齿轮直径过大而使径向尺寸常限制最小传动比 ；在升速时为防止产生过大的噪音和震动常限制最大转速比。在主传动链任一传动组的最大变速范围。在设计时必须保证中间传动轴的变速范围最小， 检查传动组的变速范围时，只检查最后一个扩大组： 其中， 所以 ，合适 1.3 绘制转速图 ⑴选择电动机 一般车床若无特殊要求，多采用Y系列封闭式三相异步电动机，根据原则条件选择Y132M1-6型Y系列笼式三相异步电动机。 ⑵分配总降速传动比 [3]确定传动轴轴数 传动轴轴数 = 变速组数 + 定比传动副数 + 1 = 2 + 1 + 1 = 4 ⑷确定各级转速并绘制转速图 由 　　z = 9确定各级转速： 1000、710、500、355