三乙醇胺对铝合金试件滚磨光整加工作用的影响分析

Discussion on Influence of Triethanolamine to Aluminum Alloy Specimen in Barrel Finishing

目的探索三乙醇胺(TEA)在铝合金试件滚磨光整加工中的作用机理。方法在相同条件下,利用不同浓度三乙醇胺溶液,对铝合金表面进行滚磨光整加工实验。采用粗糙度测量仪测试试件加工前后的表面粗糙度值的变化。采用电子天平测试试件加工前后的质量变化,通过计算得出试件的材料去除率。采用X射线衍射仪(XRD)分析试件表面的晶格畸变。采用扫描电子显微镜(SEM)分析试件的表面形貌。采用能谱仪(EDS)分析试件表面元素的变化情况。结果在加工初期,未添加三乙醇胺时,表面粗糙度值的变化率和材料去除率最小,Ra从1.245μm减小到0.934μm,MRR为0.223 mm3/min;添加体积分数为9%的三乙醇胺时,表面粗糙度值的变化率最大,Ra从1.184μm减小到0.558μm;添加体积分数为5%的三乙醇胺时,材料去除率最大,MRR为0.445 mm3/min。晶格畸变量的最大值为0.0045,最小值为0.0008。加工后试件表面富集Si元素。结论在加工初期,三乙醇胺提高了铝合金试件的滚磨光整加工效率。在液体介质和磨块对试件的耦合作用下,固体表面活性提高,试件表面产生晶格畸变,引起机械力化学效应。Si颗粒保护了Al基,使得在加工后期的微量磨削作用减弱,材料的去除率和表面粗糙度保持相对恒定状态。

The work aims to explore the mechanism of triethanolamine(TEA)in the barrel finishing of aluminum alloy specimens.Barrel finishing experiments were carried out on aluminum alloy surface with different concentrations of triethanolamine solution under the same conditions.Changes in roughness value of specimen before and after finishing were tested by a roughness measuring instrument.Changes in mass of specimen before and after finishing were tested by an electronic balance,and the material removal rates were calculated.The lattice distortion of the specimen surface was analyzed by X-ray diffractometer(XRD).The morphology of the specimen surface was analyzed by scanning electron microscope(SEM).The changes of the surface elements of the specimen were analyzed by energy dispersive spectrometer(EDS).At the initial stage of processing,the minimum variation ratio of roughness and the minimum material removal rate without the effect of triethanolamine were obtained.Ra value decreased from initial 1.245μm to 0.934μm and MRR was 0.223 mm3/min.The maximum variation ratio of roughness was obtained with the effect of triethanolamine of which the volume concentration ratio was 9%.Ra value decreased from initial 1.184μm to 0.558μm.The maximum material removal rate was obtained with the effect of triethanolamine of which volume concentration ratio was 5%.The material removal rate was 0.445 mm3/min.The maximum value of lattice distortion was 0.0045 and the minimum value of lattice distortion was 0.0008.After processing,the Si element was enriched on the specimen surface.At the initial stage of processing,the triethanolamine can improve the processing efficiency of aluminum alloy specimen.The surface activity of solids can be increased under the coupling effect by the liquid medium and the solid medium to the specimen,and the lattice distortion is produced on the specimen surface.Therefore,the mechano-chemistry effect is caused.The Si particles protects the Al base,and this phenomenon weakens the micro-grinding in the later processing.Therefore,the material removal rate and surface roughness keep constant value respectively.