스테인레스 스틸 부품의 CNC 밀링

스테인레스 스틸 밀링의 특성은 다음과 같습니다.: 스테인레스 스틸은 접착력과 융합력이 강합니다., 칩이 밀링 커터의 톱니에 쉽게 부착됩니다., 이는 밀링 조건을 악화시킵니다.;
상향 밀링 시, 커터 톱니가 경화된 표면에서 먼저 미끄러집니다., 이는 가공 경화 경향을 증가시킵니다.; 밀링할 때, 충격과 진동이 크다, 밀링 커터의 커터 톱니를 쉽게 칩화하고 마모시킬 수 있습니다..

정밀 스테인레스강 부품의 NC 밀링

For milling stainless steel, in addition to end mills and some end mills, cemented carbide can be used as milling cutter tooth materials. Other types of milling cutters are made of high-speed steel, especially tungsten-molybdenum series and high-vanadium high-speed steel with good results. The tool durability can be 1-2 times higher than W18Cr4V. Cemented carbide grades suitable for making stainless steel milling cutters are YG8, YW2, 813, 798, YS2T, YS30, YS25, 등.

When milling stainless steel, the milling edge must be sharp and able to withstand impact, and the chip pocket must be large. Large helix angle milling cutters (cylindrical milling cutters, end milling cutters) can be used, the helix angle b is increased from 20° to 45° (gn=5°), and the tool durability can be increased by more than 2 타임스. Because the working rake angle g0e of the milling cutter is increased from 11° to more than 27° at this time, the milling is brisk. But the value of b should not be too large, especially for end mills with b≤35°, so as not to weaken the teeth.

Using wave-edge end mills to process stainless steel pipes or thin-walled parts, cutting is brisk, vibration is small, chips are fragile, and the workpiece is not deformed. High-speed milling with cemented carbide end mills and stainless steel with indexable end mills can achieve good results.

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Milling 1Cr18Ni9Ti with silver chip end mill (SWC), 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=50-90m/min, Vf=630-750mm/min, a′p=2-6mm, and the feed per tooth reaches 0.4-0.8mm, the milling force is reduced by 10%-15%, and the milling power A reduction of 44%, efficiency has also been greatly improved. The principle is to grind a negative chamfer on the main cutting edge, and artificially generate a built-up edge during milling, so that it can replace the cutting edge for cutting, and the rake angle gb of the built-up edge can reach 20~-302. Due to the effect of the entering angle, the built-up edge is subjected to a thrust parallel to the cutting edge generated on a rake face and becomes a secondary chip flowing out, thereby taking away the cutting heat and reducing the cutting temperature.

When milling stainless steel, down milling should be used as much as possible. The asymmetric down milling method can ensure that the cutting edge is smoothly cut away from the metal, and the chip bonding contact area is small, and it is easy to be thrown off under the action of high-speed centrifugal force. In order to prevent the cutting chips from impacting the rake face when the cutter teeth re-cut into the workpiece, spalling and chipping will occur, and the durability of the cutter can be improved.

The spray cooling method is the most effective, which can increase the durability of the milling cutter by more than double; If a general 10% emulsion is used for cooling, the cutting fluid flow rate should be ensured to achieve sufficient cooling. When the carbide milling cutter mills stainless steel, take Vc=70-150m/min and Vf=37.5-150mm/min. 동시에, make appropriate adjustments according to the alloy grades and workpiece materials. The cutting amount of high-speed steel milling cutter is shown in Table 1

Table 1, Milling amount of stainless steel processed by high-speed steel milling cutter