共查询到20条相似文献,搜索用时 15 毫秒
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通过正交试验对氮化硅陶瓷基体进行超声精细雾化抛光,研究抛光工艺参数(抛光液流量、抛光压力、抛光盘转速)对抛光速率和表面粗糙度的影响。以抛光后氮化硅陶瓷的材料去除率和表面粗糙度为评价指标,根据正交试验结果得到最优参数组合,并与传统的抛光效果进行试验对比。结果表明:研究的3种参数中,对材料去除率的影响程度由高到低依次为雾液流量、抛光压力、抛光盘转速,对抛光后工件表面粗糙度的影响程度由高到低依次为抛光盘转速、雾液流量、抛光压力;在相同的实验条件下,精细雾化抛光的材料去除率与表面粗糙度与传统抛光接近,但精细雾化抛光的抛光液用量仅为传统用量的12.5%,有效减少了资源的浪费。 相似文献
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研究了三种典型的碳化硅光学材料CVD SiC、HP SiC以及RB SiC的材料去除机理与可抛光性,并对其进行了超光滑抛光试验。在分析各种材料制备方法与材料特性的基础上,通过选择合理的抛光工艺参数,均获得了表面粗糙度优于Rq=2nm(采样面积为0.71mm×0.53mm)的超光滑表面。试验结果表明:研磨过程中,三种碳化硅光学材料均以脆性断裂的方式去除材料,加工表面存在着裂纹以及材料脱落留下的缺陷;抛光过程中,CVD SiC主要以塑性划痕的方式去除材料,决定表面粗糙度的主要因素为表面微观划痕的深度;HP SiC同时以塑性划痕与晶粒脱落的形式去除材料,决定表面粗糙度的主要因素为碳化硅颗粒大小以及颗粒之间微孔的尺寸;RB SiC为多组分材料,决定其表面粗糙度的主要因素为RB SiC三种组分之间的去除率差异导致的高差。
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Guilian Wang Yiqiang Wang Lei Zhang Ji Zhao Haibo Zhou 《Machining Science and Technology》2013,17(4):603-625
□ A novel self-determination polishing robot finishing large mold free-form surface is developed, and the finishing process method is researched. Contrary to traditional approaches, our premise is that a large mold surface can be polished by using a small robot. This robot system is mainly composed of a polishing robot part, a computer system and a visual positioning system. A type of robot with four uniform distribution wheels was designed, which has two driving wheels and two driven wheels. Active compliant control of the polishing tool was provided by a pneumatic servo system, and a new special compliant abrasive tool was proposed on the basis of robot characteristics. The process planning steps consisted of subdividing the free-form surface, choosing an abrasive tool, planning the polishing path and optimizing machining parameters. Based on the orthogonal experiment and the grey relational analysis method, the optimal parameter combination was obtained for polishing force, tool speed and feed rate. Aiming to polishing times, the surface roughness method and polishing efficiency method were studied in detail. The polishing experiments were carried out in the robot using process parameters obtained by the efficiency method. These research results provided significant theory foundation and experimental data for a mobile robot planning polishing to realize intelligible process parameter selection. 相似文献
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化学机械抛光工艺中的抛光垫 总被引:1,自引:0,他引:1
抛光垫是晶片化学机械抛光中决定表面质量的重要辅料。研究了抛光垫对光电子晶体材料抛光质量的影响:硬的抛光垫可提高晶片的平面度;软的抛光垫可改善晶片的表面粗糙度;表面开槽和表面粗糙的抛光垫可提高抛光效率;对抛光垫进行适当的修整可使抛光垫表面粗糙。 相似文献
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Guilian Wang 《Machining Science and Technology》2013,17(1):106-121
In this paper, a serial-parallel hybrid special polishing machine tool based on the elastic polishing theory is developed, which is used for polishing mould surface by using bound abrasives. This machine tool mostly consists of parallel mechanism of three-dimensional moving platform, series rotational mechanism of two degrees of freedom and elastic polishing tool device. The parallel mechanism controls the spatial position of the polishing tool. The series mechanism controls the pose of the polishing tool. The elastic polishing tool system can realize active control by a pneumatic servo system and passive conformity by a spring. The main process parameters that have influence on surface roughness and polishing efficiency are tool speed, feed rate, force, pose angle and polishing number of times. Optimal combination of process parameters is presented by the Taguchi and grey relational analysis, which provide a choice of parameters as a basis for free-form surface polishing in practice. 相似文献
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介绍了一种基于旋转磁性抛光液体的抛光技术。磁性抛光液体在磁力搅拌器的作用下产生旋转运动,利用外加强磁场作用增大磁性液体的粘度和剪切屈服应力,当加工工件放入磁性抛光液体中,磁性抛光液体与之相接触的工件表面发生磨削,从而达到对工件表面的光整加工。实验详细研究了磁性抛光液体抛光后工件的抛光区内表面粗糙度与抛光时间和位置之间的关系,实验结果表明:旋转磁性抛光液体抛光可以用于对工件进行超光滑加工,抛光时间越长,各处粗糙程度越接近,表面粗糙度越好,并且表面粗糙度比单独用研磨抛光膏的效果好。 相似文献
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利用台式钻床和深孔加工机床分别对常用Q235钢、45钢和铝材进行孔加工试验。通过对孔表面质量的观测和粗糙度的检测,对比研究上述两种加工方法的表面质量。结果表明:麻花钻加工材料越软孔口毛刺越明显,枪钻加工软硬材料的孔口部都呈平整无毛刺。一般条件下,枪钻加工铝合金有色金属材料的孔表面粗糙度值Ra为0.9μm左右,麻花钻为1.6μm左右;枪钻加工碳钢材料孔的表面粗糙度值Ra为1.8μm左右,麻花钻孔的表面粗糙度值Ra9.6-5.6μm;对于不同硬度的碳钢,麻花钻加工孔质量变化明显,一般硬度高的质量较好,枪钻则变化不显著;相比有色金属,麻花钻及枪钻加工孔的质量都优于碳钢。 相似文献
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为解决特种材料在深孔加工过程中出现振动较大且排屑不畅、而导致表面精糙度值达不列要求的问题,着重对影响表面粗糙度值的刀具前角、后角、走刀量、切削速度四个因素进行分析并通过实验进行验证,得到了刀具几何角参数和切削用量范围.结果表明,刀具的前角20°~35°、后角6°~12°、走刀量为0.07 ~ 0.12 mm且切削速度小于225 r/min时,可以保证特种材料深孔精加工的表面精糙度值. 相似文献
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三维表面粗糙度的表征和应用 总被引:1,自引:0,他引:1
表面粗糙度会直接影响零部件的耐磨性、密封性以及抗腐蚀性等,是评定机械加工和产品质量的重要指标。现代科技水平的不断提高对零件表面性能的要求也日益严苛。传统的二维表面粗糙度的测量和表征已经不再能够满足技术发展的要求,三维表面粗糙度由于能够更加全面、真实地反映工件表面的状态而受到人们的重视,成为研究热点。本文回顾了三维表面粗糙度的发展历史,系统地介绍了三维表面粗糙度参数及标准的发展现状,分析了表面形貌与功能特性的联系,概述了三维粗糙度参数在制造业、生物医疗、摩擦学与材料科学等领域的广泛应用,并进一步指出了三维表面粗糙度表征和应用的发展方向。未来随着相关研究(比如,三维测量的溯源性、重复性、参数表征体系等问题)的深入以及三维表面测量手段的发展,三维表面粗糙度参数也将不断完善和推广,并更多地与实际功能相结合来预测并指导生产,确保工件的表面质量。 相似文献
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Chemical vapor deposited(CVD) diamond film has broad application foreground in high-tech fields.But polycrystalline CVD self-standing diamond thick film has rough surface and non-uniform thickness that adversely affect its extensive applications.Laser polishing is a useful method to smooth self-standing diamond film.At present,attentions have been focused on experimental research on laser polishing,but the revealing of theoretical model and the forecast of polishing process are vacant.The paper presents a finite element model to simulate and analyze the mechanism of laser polishing diamond based on laser thermal conduction theory.The experimental investigation is also carried out on Nd:YAG pulsed laser smoothing diamond thick film.The simulation results have good accordance with the results of experimental results.The temperature and thermal stress fields are investigated at different incidence angles and parameters of Nd:YAG pulsed laser.The pyramidal-like roughness of diamond thick film leads to the non-homogeneous temperature fields.The temperature at the peak of diamond film is much higher than that in the valley,which leads to the smoothing of diamond thick film.The effect of laser parameters on the surface roughness and thickness of graphite transition layer is also carried out.The results show that high power density laser makes the diamond surface rapid heating,evaporation and sublimation after its graphitization.It is also found that the good polish quality of diamond thick film can be obtained by a combination of large incident angle,moderate laser pulsed energy,large repetition rate and moderate laser pulse width.The results obtained here provide the theoretical basis for laser polishing diamond film with high efficiency and high quality. 相似文献
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