切削式尖头机设计+CAD图纸(9)
时间:2016-12-20 10:15 来源:毕业论文 作者:毕业论文 点击:次
8两侧拉刀 9小齿轮2 图5.1直线式切削传动系统简图 Ση=η1 *η23 *η33 = 0.99 * 0.983 * 0.973= 0.868 Pd = P /Ση=0.796/0.87 = 0.Kw n = v = 0.12 m/s 取d0 = 230 mm n = = 9.96 r/min 查[5]表7-1-1(p849) 减速器推荐传动比范围: 取i1= 8 ~ 60,i2= 3 ~ 8 则i总 = i1 * i2 = 24 ~ 480 由此得出nd=n*i总=239 ~ 4780 r/min 取nd=1440r/min i总 = i1 * i2 = nd/n ≈144 取i1= 48,i2= 3 查[4] 选择电动机型号为R87Y90S-4 电动机有配套减速器,传动比为i1= 48。 额定功率1.1 Kw 满载转速1440 r/min 额定转矩 2.3 最大转矩2.2 质量25 kg nd=1440r/min nⅠ= 1440/48 = 30 r/min nⅡ = nⅢ = 30/3= 10 r/min 计损耗 PⅠ= Pd *η1*η2=1.1 *0.99*0.98 = 1.07 Kw PⅡ = PⅢ 2 PⅡ= PⅠ*η22 *η33 = 1.07*0.982 *0.983 =0.97 Kw PⅡ = PⅢ =0.48 Kw Td = 9.55*106* Pd/ nd = 9.55*106* 1.1/ 1440 = 7295.14 N*mm TⅠ = 9.55*106* PⅠ/ nⅠ = 9.55*106* 1.07/ 30 = 3.4*105 N*mm TⅡ = TⅢ = 9.55*106* PⅡ/ nⅡ = 9.55*106* 0.48/10 = 4.58*105 N*mm 表6.1 数据汇总表 功率P(Kw) 转矩T(N*mm) 转速n(r/min) 电机轴 1.1 7295 1440 轴Ⅰ 1.07 3.4*105 30 轴Ⅱ 0.48 4.58*105 10 轴Ⅲ 0.48 4.58*105 10 轴Ⅰ轴Ⅱ见图5.1 考虑到轴Ⅰ轴Ⅱ输入功率不大,故齿轮材料选用45#,调质处理,齿面硬度分别为220HBS、260HBS 由于载荷平稳、齿轮速度不高,初选7级精度 齿数比u = i1 = 3,Z1 = 45,Z2 = Z1 * i1 = 45*3 = 135 按两支承相对小齿轮不对称布置查表6.5,取齿宽系数 = 1 TⅠ= 9.55*106* PⅠ/ nⅠ = 9.55*106* 1.07/ 30 = 3.4*105 N*mm 查[6]表6.3得ZE = 189.8 按齿面硬度查[6]图6.8得 σHlim1 = 600 MPa σHlim2 = 560 MPa 假设工作寿命为10年,每年工作300天,两班制。 N1 = 60 n1 j Ln = 60 * 30 * 1 * 10 * 300 * 16 = 8.64*107 N2 = N1 /u = 8.64*107/3 = 2.88*107 查[6]图6.6得 KHN1 = 0.98 KHN2 = 1.02 取安全系数SH =1 [σH1] = KHN1 * σHlim1 / SH = 0.98 * 600 / 1 = 588 MPa [σH2] = KHN2 * σHlim2 / SH = 1.02 * 560 / 1 查[6]表6.2得 使用系数KA=1 根据v = 0.154 m/s,7级精度查图6.10得动载系数KV=1.1 查图6.13得 Kβ=1.15 则K= KA * KV * Kβ = 1*1.1*1.15 = 1.265 m = d1 / Z1 = 92.47/45 = 2.1 mm 按标准取模数m = 3 mm d1 = m * Z1 = 3 * 45 = 135 mm d2 = m * Z2= 3 * 135 = 405 mm a = m(Z1 +Z2)/ 2 = 3 *(45 + 135)/ 2 = 270 mm b = ψd * d1t = 1 * 92.47 = 92.47 mm b1 = b2 +(5~10)mm 取b1 = 100 mm b2 = 95 mm h = 2.25 * m = 2.25 * 3 = 6.75 mm da1 =(Z1 + 2 * ha*)* m ha*=1 da1 =(45 + 2 * 1)* 3 = 141 mm da2 =(Z2 + 2 * ha*)* m ha*=1 da2 =(135 + 2 * 1)* 3 = 411 mm df1 =(Z1 - 2 * ha* - 2 * c*)* m ha*=1 c*=0.25 df1 =(45 - 2 * 1 - 2 * 0.25)* 3 = 127.5 mm df2 =(Z2 - 2 * ha* - 2 * c*)* m (责任编辑:qin) |