采用不同加工方法可能达到的尺寸精度(IT)和表面粗糙度(Ra):采用加工方法尺寸精度(IT)表面粗糙度(Ra)砂模铸造、气割加工IT10~IT166.3~25型壳铸造加工IT8~IT131.6~25离心铸造加工IT8~IT161.6~25精密铸造加工IT6~IT160.4~12.5金属模压力铸造加工IT7~IT110.8~12.5粉沫冶金IT9~IT113.2~12.5热轧加工IT8~IT111.6~12.5模锻加工IT13~IT1725以上冷轧加工IT5~IT120.2~12.5滚压、挤压加工IT6~IT80.4~1.6冷冲压IT10~IT156.3~25外圆车削粗车IT11~IT1312.5~25半精车IT9~IT103.2~6.3精车IT7~IT80.8~1.6端面车削粗车IT10~IT136.3~25半精车IT8~IT91.6~3.2精车IT6~IT70.4~0.8金刚石车削精车IT5~IT60.2~0.4外圆铣削粗铣IT12~IT1312.5~25半精铣IT10~IT116.3~12.5精铣IT8~IT91.6~3.2端面铣削粗铣IT11~IT1312.5~25半精铣IT9~IT103.2~6.3精铣IT7~IT80.8~1.6高速铣削粗铣IT8~IT91.6~3.2精铣IT6~IT70.4~0.8刨削粗刨IT11~IT136.3~12.5半精刨IT8~IT103.2~6.3精刨IT6~IT70.8~3.2平面磨削外圆磨削内孔磨削钻孔扩孔铰孔镗孔粗磨半精磨精磨粗磨半精磨精磨粗钻精钻粗扩精扩粗铰半精铰精铰粗镗半精镗精镗IT10~IT11IT8~IT9IT6~IT7IT11~IT12IT9~IT10IT7~IT8IT11~IT13(无钻模)IT8~IT10(有钻模)IT11~IT13IT9~IT10IT9~IT10IT7~IT8IT5~IT6IT11~IT13IT9~IT10IT7~IT86.3~12.51.3~3.20.4~0.86.3~12.53.2~6.30.8~1.612.5~501.6~6.312.5~251.6~6.33.2~6.30.8~1.60.2~0.412.5~253.2~6.30.8~1.6金刚镗孔精密镗粗插插削精插粗拉拉削精拉IT5~IT7IT11~IT13IT8~IT10IT10~IT11IT7~IT90.2~0.812.5~251.6~6.36.3~12.50.8~3.2刮削25mmX25mm8~25点数0.1~0.8锉削珩磨研磨手工锉粗珩磨精珩磨粗研磨精研磨IT7~IT14IT6~IT7IT5~IT6IT5~IT6IT50.8~250.4~0.80.2~0.40.2~0.40.1~0.2抛光超精加工精密加工IT5~IT6粗超加工IT6~IT8精超加工IT5~IT60.05~0.40.4~1.60.05~0.4化学磨削化精磨电解磨削电精磨IT7~IT13IT5~IT70.8~250.1~0.8滚压半精加工IT7~IT100.8~6.3