数控加工参数表.doc

一、主轴转速n(r/min)主轴转速一般根据切削速度V来选定，计算公式为：n=1000V（d）式中，d为刀具直径（mm），V为刀具切削速度（m/min）。对于球头铣刀，工作直径要小于刀具直径，故其实际转速应大于计算转速n。表 铣刀的切削速度V (单位：m/min)工件材料铣刀材料碳素钢高速钢超硬高速钢硬质合金碳化钛碳化钨铝合金75150180300300600镁合金180270150600硬铝合金45100120190黄铜（软）12252025100180青铜1020204060130青铜（硬）101515204060铸铁（软）10121520182575100铸铁（硬）101510204560冷硬铸铁10153060可锻铸铁10152030254075110钢（低碳）1014182820304570钢（中碳）1015152518284060钢（高碳）101512203045合金钢3580合金钢（硬）3060高速钢12254570二、进给速度Vf (mm/min) Vf = fzzn式中n为主轴转速，z为铣刀齿数，fz为每齿进给量（mm/齿）. 每齿进给量fz的选取主要取决于工件材料的力学性能、刀具材料、工件表面粗糙度等因素。工件材料的强度和硬度越高，fz越小；反之则越大。硬质合金铣刀的每齿进给量高于同类高速钢铣刀。工件表面粗糙度要求越高，fz就越小。1、铣削加工表2 铣刀每齿进给量fz (单位：mm/齿) 铣刀工件材料面铣刀立铣刀成形铣刀高速钢镶刃刀硬质合金镶刃刀铸铁0.20.050.040.30.1可锻铸铁0.150.050.040.30.09低碳钢0.20.050.040.30.09中高碳钢0.150.040.030.20.08铸钢0.10.050.040.20.08镍铬钢0.10.020.020.150.06高镍铬钢0.10.020.020.10.05黄铜0.20.050.040.030.21青铜0.150.050.040.030.1铝0.10.060.040.020.1Al-Si合金0.10.050.040.180.08Mg-Al-Zn0.10.050.030.150.08Al-Cu-Mg0.10.050.040.020.1Al-Cu-Si2、镗削加工 表3 镗孔切削用量工序铸铁钢铝及铝合金V(m/min)f(mm/r)V(m/min)f(mm/r)V(m/min)f(mm/r)粗镗高速钢20250.20.625300.20.61001500.51.5硬质合金303511.535550.20.61002500.81.5半精镗高速钢20350.150.4525350.10.51002000.20.5硬质合金50700.20.555850.150.551203000.30.6精镗高速钢22400.080.3525370.10.351202500.10.4硬质合金70900.120.3560800.150.351504000.10.43、攻螺纹 攻螺纹前底孔直径的确定：攻米制螺纹 螺距P1mm：d0=d（1.041.06）P式中 P 螺距(mm) d0 钻头直径(mm) d 螺纹公称直径(mm)攻不通孔螺纹 钻孔深度=所需螺孔深度0.7 d表4 攻普通螺纹前的底孔直径螺纹公称直径d螺距P钻头直径d0铸铁、青铜黄铜、铝及铝合金钢、紫铜可锻铸铁20.40.251.61.751.61.752.50.450.352.052.152.052.1530.50.352.52.652.52.6540.70.53.33.53.33.550.80.54.14.54.24.5610.754.95.255.281.2510.756.66.97.16.777.2101.51.2510.758.48.68.99.18.58.799.2121.751.51.25110.110.410.610.910.210.510.711螺纹公称直径d螺距P钻头直径d0铸铁、青铜黄铜、铝及铝合金钢、紫铜可锻铸铁1421.5111.812.412.91212.5131621.5113.814.414.91414.515182.521.5115.315.816.416.915.51616.517202.521.5117.317.818.418.917.51818.519222.521.5119.319.820.420.919.52020.52124321.5120.721.822.422.9212222.523表5 攻英制螺纹前的底孔直径公称直径/非螺纹密封管螺纹英制锥管螺纹英制锥螺纹每25.4内的牙数钻头直径/每25.4内的牙数钻头直径/每25.4内的牙数钻头直径/1/8288.8288.4278.61/41911.71911.21811.13/81915.21914.71814.51/21418.91418.31417.93/41424.41423.61423.211130.61129.71129.21141139.21138.31137.91381141.61121145.11144.11143.921155.81156表6 攻螺纹切削速度（单位：m/min）工件材料铸铁钢及合金钢铝及铝合金切削速度V2.551.555154、钻孔加工表7 用高速钢钻头钻孔切削用量(f单位：mm/r)工件材料牌号或硬度切削用量钻头直径1661212222250铸铁HB160-200V1624f0.070.120.120.20.20.40.40.8HB200-241V1018f0.050.10.10.1800.180.250.250.4HB300-400V512f0.030.080.080.150.150.20.20.3钢35、45V825f0.050.10.10.20.20.30.30.4515Cr、40CrV1230f0.050.10.10.20.20.30.30.45合金钢V818f0.030.080.080.150.150.250.250.35铝纯铝V2050f0.020.150.050.30.080.50.150.8铝合金V2050f0.020.10.040.20.080.40.10.7铜黄铜青铜V6090f0.020.10.10.20.20.250.250.75硬青铜V2545f0.030.050.050.150.120.250.250.5（用合金钻头进行孔加工时，可适当提高转速和进给量。）5、铰孔加工铰孔属于精加工工序，加工过程中应合理选择铰刀的类型及材质，高速钢铰刀属于通用铰刀，硬质合金铰刀一般用于加工钢、铸钢、灰铸铁和冷硬铸铁。为了达到较高的孔径精度和表面质量，应采用较低的切削速度和进给量并合理选择切削液。铰孔前应留有铰削余量，一般为0.10.2mm 底孔直径=铰刀直径（0.10.2）mm铰削加工时切削速度V取315m/min进给量f取0.050.5mm/r注意:在正式加工之前应试铰，并检验孔径及粗糙度是否符合要求。