我厂在龙门铇床上加工汽轮机零件时,学习捷克斯洛伐克的先进经验,採用了一种新型铇刀——圆形铇刀,使劳动生产率提高了50％～200％。圆形铇刀的形状圆形铇刀的形状如图1,图1甲是我厂正在使用的一种。它的直径是φ50～70公厘。圆形铇刀上磨有15°的前角,和5°的后角。图1乙是改进的圆形铇刀,外圆直径65公厘,内孔直径35公厘,前角γ= 20°,没有磨出后角。在安装时,由于刀杆斜成5°,所以使前角成为15°,并具有5°的 When I process turbine parts in gantry crane bed, I learned advanced experience in Czechoslovakia and adopted a new type of trowel - round trowel, which increased labor productivity by 50% ~ 200%. Round trowel shape Round trowel shape shown in Figure 1, Figure 1 A is my factory is using a. Its diameter is φ50 ~ 70 mm. Round trowels have a 15 ° rake angle and a 5 ° clearance angle. Figure 1 B is an improved round trowel, the outer diameter of 65 mm, bore diameter of 35 mm, rake γ = 20 °, did not wear out the relief angle. At the time of installation, since the arbor is inclined by 5 °, the front angle becomes 15 ° and the angle of 5 °