The long, thin axle, how to install the tool, and whether to aim at the center
Because of the rigidity of the workpiece, the geometrical shape of the lathe has obvious effect on the vibration of the workpiece due to the rigidity of the workpiece. When choosing, consider the following points: 1, because the newborn slender shaft is poor, to reduce the bending, slender shaft radial cutting force as small as possible, and the cutting tool's main Angle are the main factors influencing the radial cutting force, in does not affect the tool strength situation, should try to increase the turning Angle. Lord of the turning Angle for kr = 80 ° ~ 93 °. 2, to reduce the cutting force and cutting heat and smoke should choose larger rake Angle, take r0 = 15 ° to 30 °
Depending on the requirements, don't use the tool rack and the center frame.I hope my answer will help you.
Car, slender shaft turning point should be slightly higher than the center of the workpiece is 0.2 ~ 0.3 mm, because of the coordinate plane (cutting plane and reference plane) change, and make the rake Angle greaten, after Angle is smaller. And when there is a slight fraying in the back, there is a small amount of wear and tear that is equal to zero to prevent the vibration of the workpiece.
The turning of a slender shaft 1, the blade material is YT15 hard alloy. Cutting usage: when roughing, the cutting speed vc = 50 ~ 60m/min; Feed quantity f = 0.. 3 ~ 0.4 mm/r; cutting Depth ap = 1.5 ~ 2mm. In fine cars, the cutting speed vc = 60 ~ 100m/min; Quantity of feed f = 0.08 ~ 0.12 mm/r; Cutting depth ap = 0.5 ~ 1mm. The emulsion is used as the cutting fluid. Applicable scope: apply to the long and thin shaft such as cutting rod and silk rod.
The cutting grooves of R11.5 ~ 3 should be worn in front of the lathe. 4, choose positive edge Angle, take into = 3 ° cutting debris flow for machining surface, and make the chip volume effect is good. The surface roughness of the cutting edges is required under Ra0.4 and is always sharp. In order to reduce the radial cutting force, choose the smaller tip radius (re < 0.3 mm). The width of the chamfer should also be smaller, the chamfer width br1 = 0.5 f.
