خصائص طحن الفولاذ المقاوم للصدأ هي: الفولاذ المقاوم للصدأ لديه التصاق وانصهار قوي, ومن السهل التصاق الرقائق بأسنان قاطع الطحن, مما يجعل ظروف الطحن أسوأ;
عند الطحن, تنزلق أسنان القاطع على السطح المتصلب أولاً, مما يزيد من ميل تصلب العمل; عند الطحن, التأثير والاهتزاز كبيران, مما يجعل أسنان القاطع لقاطع الطحن سهلة التقطيع والتآكل.
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, إلخ.
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 مرات. 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.
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. بسبب تأثير زاوية الدخول, تتعرض الحافة المبنية لضغط موازٍ لحافة القطع المتولدة على وجه أشعل النار وتصبح شريحة ثانوية تتدفق للخارج, وبالتالي إزالة حرارة القطع وتقليل درجة حرارة القطع.
When milling stainless steel, يجب استخدام الطحن السفلي قدر الإمكان. يمكن لطريقة الطحن غير المتماثلة أن تضمن قطع حافة القطع بسلاسة بعيدًا عن المعدن, 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, والتي يمكن أن تزيد من متانة قاطع الطحن بأكثر من الضعف; لو جنرال 10% يستخدم مستحلب للتبريد, وينبغي ضمان معدل تدفق سائل القطع لتحقيق التبريد الكافي. عندما يقوم قاطع طحن الكربيد بطحن الفولاذ المقاوم للصدأ, take Vc=70-150m/min and Vf=37.5-150mm/min. في نفس الوقت, 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
نوع قطع الطحن | Milling cutter diameter d0 (مم) |
Spindle speed n (دورة في الدقيقة) |
Feed amount f (مم/دقيقة) |
ملاحظات |
مطحنة نهاية | 3-4 | 1180-750 | يدوي | When the cutting width and cutting depth are small, the feed amount f takes a large value; على العكس تماما, when milling 2Cr13 and other martensitic stainless steel with a small value, the milling amount should be adjusted according to the actual hardness of the workpiece material When milling concentrated nitric acid resistant stainless steel, the milling speed and feed rate should be appropriately reduced |
5-6 | 750-475 | |||
8-10 | 600-375 | |||
12-14 | 375-235 | 30-37.5 | ||
16-18 | 300-235 | 37.5-47.5 | ||
20-25 | 235-190 | 47.5-60 | ||
32-36 | 190-150 | 47.5-60 | ||
40-50 | 150-118 | 47.5-75 | ||
Wave edge end mill | 36 | 190-150 | 47.5-60 | |
40 | 150-118 | |||
50 | 118-95 | |||
60 | 95-75 | 60-75 | ||
Saw blade milling cutter and face milling cutter | 75 | 235-150 | 23.5 or Manual | |
110 | 150-75 | |||
150 | 95-60 | |||
200 | 75-37.5 |
Table 1, Milling amount of stainless steel processed by high-speed steel milling cutter