Milling stainless steel Except for end mills and some end mills and carbide milling cutter materials, all other types of milling cutters are made of high-speed steel, especially tungsten-molybdenum and high-vanadium high-speed steel have good results, cutting tools Durability is 1 to 2 times higher than W18Cr4V. Carbide grades suitable for manufacturing stainless steel milling cutters are YG8, YW2, 813, 798, YS2T, YS30, YS25, etc.

The spray cooling effect is the most significant, which can increase the durability of the milling cutter by more than one time; if the general 10% emulsion is used for cooling, the flow of the cutting fluid should be fully cooled. When milling carbide with carbide milling cutter, take Vc=70~150m/min, Vf=37.5~150mm/min, and adjust according to alloy grade and workpiece material.

Stainless steel has strong adhesion and fusion, and chips are easy to adhere to the cutting edge of the milling cutter, which deteriorates the cutting conditions. When milling, the cutting edge first slides on the hardened surface, which increases the tendency to work harden; the impact vibration during milling is high, which makes the milling cutter insert prone to chipping and wear.

When milling stainless steel, the cutting edge must be sharp and shock resistant, and the chip flute should be large. Large helix angle milling cutters (cylindrical milling cutters, end milling cutters) can be used. The screw angle b is increased from 20° to 45° (gn=5°), and since the milling cutter works at this time, the tool durability can be increased by more than 2 times. The rake angle g0e has been increased from 11° to over 27° and the milling is light. However, the b value should not be very large, especially for end mills, b≤35°, so as not to weaken the teeth.

Stainless steel pipes or thin-walled parts are processed by wave edge end mills, with light cutting, small vibration, brittle chips, and no deformation of the workpiece. High speed milling with carbide end mills and stainless steel with indexable end mills with good results.

Use geometric parameters gf=5°, gp=15°, af=15°, ap=5°, kr=55°, k'r=35°, g01=-30°, bg=0.4 Milling cutter milling 1Cr18Ni9Timm, re=6mm, when Vc=50~90m/min, Vf=630~750mm/min, a'p=2~6mm, the feed per tooth reaches 0.4~0.8mm, and the milling force is reduced. 10% to 15% smaller, milling power is reduced by 44%, and efficiency is greatly improved. The principle is to grind a negative chamfer on the main cutting edge, artificially creating a combined edge during the milling process, so that it can be cut instead of a cutting edge. Due to the lead angle, the rake angle gb of the combined edge can reach 20~302. The effect is that the combined edge is an auxiliary chip by the thrust generated on the rake face parallel to the cutting edge, thereby removing the heat of the cut and reducing the cutting temperature.

The same method should be used when milling stainless steel. The asymmetrical cross milling method can ensure that the cutting edge and the metal are cut smoothly, the chip contact area is small, and it is easily broken under the action of high-speed centrifugal force, so that when the tooth re-cuts into the workpiece, the chip will hit the rake face. Stripping and cutting improve tool durability.

Stainless steel materials are widely used and may be encountered in machining, milling, drilling and tapping. However, due to the different characteristics of stainless steel and other common materials, machining stainless steel has become a major problem for technicians!