Turning with a special surface to improve the quality of emulsion – Turning – Ma
Its cooling properties of emulsion and oil lubrication properties, the most suitable for the smallest amount of lubrication for the cutting operation. Smoke-like compressed air is inhaled through the media to the cutting operation area, the minimum amount of cooling lubrication (MMS) are increasingly being used for the cutting process, and that this is because to do so can achieve high cutting velocity and a longer the tool life. To avoid overflow cooling lubricants can save a lot of cooling lubricants. The introduction of the minimum amount of cooling lubricant is less than 50ml / h. Surface quality is judged Judged the quality of the workpiece is turning operation can be achieved surface quality. The following study results are based on R35 carbon steel (PN-89/H-84023/07) turning (Figure 1). This steel has the following mechanical properties: hardness HRC125, tensile strength S K = 350MPa, an extension of the limit s 0.2 = 235MPa, elongation d K = 25%. To pilot the use of the CU 502 turning device. As a cutting tool with CSDBM2020M12 Chuck And SNUN120408 blades Turning tool , Hard metal blade with P25, surgeon k r = 70 °, Deputy knife k ' r = 20 °, cutting angle g =- 8 °, cutting depth of 0.8mm. With the concentration of 4% OportetRG-2 as a cooling lubricant emulsions. Cooling lubricant additives as a base of ethylene glycol and methanol-M formed by the chlorine and sulfur in the RC960l hydrocarbons. In order to generate emulsion smoke, using a nozzle with the air compressor is connected by air and emulsion spray device, the working pressure is 0.2MPa. Test the depth of the incision ap = 1mm and under the conditions of the following parameters: feed f = 0.1 ~ 0.5mm/min, cutting speed v c = 50 ~ 450m/min, emulsion flow E = 1.5 ~ 3.5g/min, compressed air P = 4.5 ~ 6.5m3 / h. Roughness according to ISO3274: 1997 and ISO4287: 1998 standard measurements. Roughness values of the following experiment: the arithmetic mean shape coordinates Ra, the largest square shape and form the average height of Rz Rq. In the first experiment, to determine the additive RC9601 and methanol-M in the emulsion of the best concentration of aerosol. For this purpose, select the cutting operation the average of all the parameters: vc = 250mm/min, f = 0.3mm/min, P = 5.5m 3 / H, E = 2.5g/min. In analyzing the test results, found that the concentration of the additives 5%, Ra and Rq roughness minimum. Plus there is additive emulsion aerosols significantly lower roughness Figure 2 shows the roughness parameters and cutting velocity changes between. In almost the entire cutting speed range of additives through the emulsion with aerosols can be the smallest roughness values Ra. This is because the additive containing compounds can reduce the friction. In the cutting speed Vc> 400m/min, all the parameters of the cooling mode similar Ra values. Parameter Rz emulsion containing additives under the aerosol cooling value is greater than the value when dry machining. Compared with the dry process, all the roughness parameter values in less than 200m/min cutting speed, it will be down about 10% to 50%. Using compressed air cooling will reduce the roughness Shown in Figures 3 and 4 on the R35 in the dry turning of steel after the roughness parameters Ra and Rz of the comparison (cooling: with RC9601 additives and methanol-M emulsion aerosols). Such additives can be recommended emulsion containing aerosols, because this can improve the roughness of the maximum Ra. Although the use of non-additive emulsion aerosols cases, also won the Ra better than dry machining parameters, but the extent of this improvement is extremely limited. The use of compressed air cooling when compared with dry machining, roughness parameter is reduced. Containing additives and the use of methanol-M emulsion aerosols cases, the roughness parameter values to a great feed and cutting speed is reduced within the range. R35 in turning steel, the cutting speed the smaller the surface roughness, the higher the degree of improvement.
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