Milling of the hottest stainless steel

Milling of stainless steel

the characteristics of milling stainless steel are: stainless steel has strong adhesion and fusibility, and chips are easy to adhere to the milling cutter teeth, which worsens the cutting conditions; During reverse milling, the cutter teeth slide on the hardened surface first, which increases the trend of work hardening; The impact and vibration during milling are large, which makes the milling cutter teeth easy to collapse. EVOH high barrier resin blade and wear brought by Kela Li at the Chinaplas exhibition in 2016

milling stainless steel except that end mills and some end mills can use cemented carbide as milling cutter tooth materials, all other types of milling cutters use high-speed steel, especially tungsten molybdenum series and high vanadium high-speed steel, which have good effects. Changing the mechanical performance in vivo can lead to the reconstruction of adjacent structures or load transfer, and its tool durability can be 1 ~ 2 times higher than W18Cr4V. Cemented carbide grades suitable for making stainless steel milling cutters include YG8, yw2, 813, 798, ys2t, ys30, YS25, etc

when milling stainless steel, the cutting edge should be sharp and able to withstand impact, and the chip holding groove should be large. Large spiral angle milling cutter (cylindrical milling cutter, end milling cutter) can be used. The spiral angle B increases from 20 ° to 45 ° (n=5 °), and the tool durability can be increased by more than 2 times, because at this time, the working rake angle G0e of the milling cutter increases from 11 ° to more than 27 °, and the milling is light and fast. However, the value of B should not be larger, especially for the end milling cutter, B ≤ 35 ° is appropriate, so as not to weaken the cutter teeth

adopt wave edge end milling cutter to process stainless steel pipes or thin-walled parts, with light cutting, small vibration, fragile chips and no deformation of the workpiece. Good results can be achieved by high-speed milling with cemented carbide end mills, cutting with one sensor, and milling stainless steel with indexable end mills

when 1Cr18Ni9Ti is milled with silver white chip (SWC) end milling cutter, its geometric parameters are 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, the milling power decreases by 44%, and the efficiency is greatly improved. The principle is to grind negative chamfers on the main cutting edge, and artificially generate chip nodules during milling to replace the cutting edge for cutting. The rake angle B of the chip nodules can reach 20 ~ 302. Due to the effect of the main deflection angle, the chip nodules are pushed by a rake surface parallel to the cutting edge and become the outflow of side chips, which takes away the cutting heat and reduces the cutting temperature

when milling stainless steel, the forward milling method should be used as far as possible. The asymmetric forward milling method can ensure that the cutting edge can be smoothly cut from the metal, the bonding contact area of the chips is small, and it is easy to be thrown away under the action of high-speed centrifugal force, so as to avoid the phenomenon of peeling and edge collapse before the chip impact when the cutter teeth re cut into the workpiece, and improve the durability of the tool. It has the characteristics of high precision, good stability and large measurement range

the spray cooling method is the most effective, which can improve the durability of milling cutter by more than twice; If 10% emulsion is used for cooling, the cutting fluid flow shall be ensured to achieve sufficient cooling. When milling stainless steel with carbide milling cutter, take vc=70 ~ 150 m/min, vf=37.5 ~ 150 mm/min, and make appropriate adjustments according to the alloy brand and workpiece material. (end)