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 切削式尖头机设计+CAD图纸(9):http://www.youerw.com/jixie/lunwen_1320.html