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What are the characteristics of stainless steel cutting?
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What are the characteristics of stainless steel cutting?

The release date:2017-10-21 Author: click:

Antirust cutting fluid is much worse than mild steel. The machinability of ordinary steel No. 45 as of 100%, the relative machinability of 1Cr18Ni9Ti austenitic stainless steel 40%; ferritic stainless steel 1Cr28 48%; martensitic stainless steel 2Cr13 55%. Among them, the austenite and austenite and ferrite machinability of the stainless steel is the worst. Stainless steel has the following several aspects: 1. characteristics in the cutting process of hardening serious: in stainless steel, austenitic and ferrite to austenite + hardening of austenitic stainless steel is most prominent. Such as austenitic stainless steel after hardening strength? B is 1470 ~ 1960MPa, and with the increase of B, the yield limit?? s increased; austenitic stainless steel in the annealed state? S no more than a b30% ~ 45%, and the work hardening after 85% ~ 95%. Depth of hardening layer of the cutting depth of 1/3 or more; the hardness of hardened layer than the original increase 1.4 ~ 2.2 times. Because the stainless steel plastic, plastic deformation character distortion enhancement coefficient; and the austenite is not stable enough, in cutting stress, part austenite transformed into martensite; plus compound impurities in cutting under the action of the thermal decomposition is easy to diffuse distribution, make machining when hardening layer. The hardening phenomenon produced by a feed or before a process seriously affect the follow-up process smoothly. 2.: stainless steel cutting force in the cutting process of plastic deformation, especially the austenitic stainless steel (the elongation is more than 1.5 times higher than No. 45 steel), the cutting force is increased. At the same time, the work hardening stainless steel, high temperature strength, further increases the cutting force, chip curling break is also difficult. Therefore, the cutting force of stainless steel, such as unit cutting force in turning 1Cr18Ni9Ti 2450MPa, more than 45 steel high 25%. Three Cut the wire cutting fluid High cutting temperature, plastic deformation and friction between the tool and the large cutting, the cutting heat; and the thermal conductivity of stainless steel is about 45 steel??, a large number of cutting heat is concentrated in the cutting zone and tool chip contact interface, poor cooling conditions. Under the same conditions, 1Cr18Ni9Ti cutting more than 45 steel high temperature 200 degrees celsius. The 4. chip is not easy to break, easy bonding: stainless steel plasticity and toughness are large, turning the chip without stop, not only affects the operation smoothly, the chip will squeeze the machined surface. Under high temperature and high pressure, stainless steel and other metal affinity is strong, easy to produce adhesion phenomenon, and the formation of bue, both the increase of tool wear and tear phenomenon will occur and the machined surface deterioration. The characteristics of martensitic stainless steel with lower carbon content is more obvious. 5. easy tool wear: affinity cutting stainless steel in the process of the tool chip generated between the bonding and diffusion, so that the tool adhesion wear, diffusion wear, crater in the cutter, the cutting edge will form small spalling and gap; plus Stainless Steel Carbide hardness particles (such as TiC) very high, when the cutting tool with direct contact, friction, abrasion and cutting tool, work hardening phenomenon, will cause the tool wear intensifies. 6. linear expansion coefficient: stainless steel line expansion coefficient is about 1.5 times that of carbon steel, the cutting temperature under the action of the workpiece is easy to produce thermal deformation, dimensional accuracy is difficult to control.

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