The problem of CNC machining stainless steel is that the adhesion and fusion of stainless steel are strong, the chips are easy to adhere to the cutter teeth, and the cutting conditions are deteriorated. The impact and vibration during CNC machining are large, which makes the cutter teeth easy to collapse. Blade and wear.
CNC machining of stainless steel except end mills and partial end mills can be made of hard alloys as milling cutter teeth. The other types of milling cutters are made of high speed steel, especially tungsten-molybdenum and high vanadium high speed steel. Its tool durability is 1 to 2 times higher than W18Cr4V. Carbide grades suitable for making stainless steel milling cutters are YG8, YW2, 813, 798, YS2T, YS30, YS25 and the like.
When machining CNC stainless steel, the cutting edge must be sharp and bear the impact, and the chip pocket should be large. Large helical angle milling cutters (cylindrical milling cutters, end mills) can be used. The screw angle b is increased from 20° to 45° (gn=5°), and the tool durability can be increased by more than 2 times because the milling cutter works at this time. The rake angle g0e is increased from 11° to 27°, and the CNC machining is light. However, the b value should not be large, especially the end mill should be b ≤ 35 °, so as not to weaken the teeth.
The stainless steel pipe or thin-walled parts are processed by the wave edge end mill, the cutting is light, the vibration is small, the chips are brittle, and the workpiece is not deformed. High-speed CNC machining with carbide end mills and CNC machining of stainless steel with indexable end mills can achieve good results.
1Cr18Ni9Ti is machined by silver chip (SWC) end mill CNC with geometric parameters of gf=5°, gp=15°, af=15°, ap=5°, kr=55°, k′r=35°, g01 =-30°, bg=0.4mm, re=6mm, when Vc=50～90 m/min, Vf=630～750mm/min, a′p=2～6mm and the feed amount per tooth reaches 0.4～0.8mm At the time, the CNC machining force is reduced by 10% to 15%, the CNC machining power is reduced by 44%, and the efficiency is greatly improved. The principle is that the negative chamfer is ground on the main cutting edge, and the built-in chip is artificially generated during CNC machining, so that it can be cut instead of the cutting edge. The front angle gb of the built-up edge can reach 20~~302, due to the lead angle The effect of the built-up edge is caused by the thrust generated on the rake face parallel to the cutting edge to become the auxiliary chip, which takes away the cutting heat and reduces the cutting temperature.
When CNC machining stainless steel, it should be processed by the same method as possible. The asymmetrical cross-milling method can ensure that the cutting edge is smoothly cut off from the metal, and the contact area of the chip bonding is small, and it is easy to be smashed under the action of high-speed centrifugal force, so that the chip impacts the rake face when the tooth re-cuts into the workpiece. Peeling and chipping improve the durability of the tool.
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