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磨料水射流加工去除模型研究 总被引:11,自引:0,他引:11
采用ANSYS Fluent对磨粒流场进行瞬态CFD仿真,得到射流过程中磨粒的分布和速度;并研究射流加工区磨粒运动机制,研究表明,新型后混合式磨料水射流加工中磨粒很容易穿过射流加工的静压区直接与工件发生作用进而去除材料。建立磨粒冲击塑性材料的冲击变形磨损模型,并结合Finnie塑性剪切磨损去除模型建立磨料水射流加工去除模型,模型表明,射流加工中心区域的材料去除量最高。根据新型后混合式磨料水射流系统进行塑性材料的磨料水射流加工试验,结果表明,射流加工中心区域材料去除最高,这是由于射流加工中心区域磨粒冲击角度较大、磨粒速度较高,材料以冲击变形磨损去除为主;远离射流冲击中心区域材料去除较低,材料以剪切磨损去除为主,与磨料水射流加工去除模型是完全一致的,证实磨料水射流加工去除模型的正确性。 相似文献
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射流抛光技术能够获得原子级粗糙度和无损伤表面,已成为最具发展潜力的超光滑表面加工技术之一,而冲击角度是影响抛光效果的一个重要参数。利用自主研制的射流抛光实验机,通过定点冲击实验,研究不同冲击角度下的被加工表面材料去除形貌及去除量。实验结果表明,随着冲击角度的减小,材料去除形状愈发不对称,材料去除率逐渐降低,而最大去除深度出现非单调变化。结合冲击射流流场分布和颗粒碰撞角度的变化,分析冲击角度对材料去除特性的影响机制,发现射流冲击角度对材料去除的影响主要归因于射流中颗粒碰撞角度及颗粒碰撞次数的变化;颗粒碰撞角度越大,碰撞次数越多,则材料去除量越大;两者的综合作用影响着材料去除量及材料去除分布。 相似文献
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磨料电化学射流加工是由磨料水射流加工与电化学射流加工复合而成,因此磨料电化学射流材料去除模型是综合了磨料水射流加工去除模型和电化学射流去除模型得到的。而磨料水射流加工模型包括冲击磨损去除模型和剪切磨损去除模型,电化学射流加工去除模型是根据电解加工工件的阳极溶解规律建立的。首先分析了单颗磨粒的冲击磨损和剪切磨损去除模型,得到多颗粒磨料水射流加工的去除模型,然后根据法拉第定律得到电化学射流加工去除模型,最后合成得到复合加工的去除模型。 相似文献
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研究了磨料流抛光中磨粒微去除力学建模方法以及可控因素影响抛光效果的问题。以力为纽带,提出磨粒去除工件表面微凸材料的动力来源于三个方面--介质作用力、磨粒挤压载荷和磨粒冲击载荷。利用建立的力学模型,分析了磨料流加工的内在因素,其中可控因素包括:加工温度、加工压力、活塞的移动速度、磨料黏度、磨粒物理性质(如尺寸、硬度)等;研究了各可控影响因素与工件表面抛光质量及效率的关系;量化了可控因素的大小对磨粒作用在工件表面的力的影响程度;将磨粒作用在工件表面的力合成并分解为与活塞运动方向相同的轴向力和垂直于工件壁面的切向力,指出微去除效果随轴向力与径向力的比值改变而发生变化,设计出简易的测量轴向力和径向力的方案。用试验验证了所建模型和可控因素对抛光效果影响,以及工件表面的加工纹理方向直接影响工件表面粗糙度的减小率和材料去除率的正确性。 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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M. D. Moreno-Rabel J. A. Fernández-Mu noz 《The International Journal of Advanced Manufacturing Technology》2016,83(1-4):77-87
Abrasive water jet (AWJ) machining is characterized by its versatility, i.e., it can be applied to a wide variety of materials. Currently, one important application is for manufacturing gem artifacts, especially agate, which is the largest gemological material produced in the state of Rio Grande do Sul. However, one of the main obstacles to its popularization is the cost associated with the process, due to the high abrasive consumption required for a good quality surface finish. In this sense, this research paper presents a study of the influence of the main process parameters (traverse speed and abrasive mass flow rate) on the surface finish of agates machined by AWJ. The experimental procedure used three different traverse speeds, four abrasive mass flow rate in two different thicknesses of agate’s plates. Surface roughness and angle of striation marks were observed for different depths from the jet entrance surface. Results were analyzed using analysis of variance (ANOVA). Through the study, it was found that the machined surface finish varies according to the depth from the entrance surface of the abrasive jet. Also, it was concluded that the surface finish of the machined surface by AWJ (surface roughness and striation marks) of the agate’s plates machined by AWJ exhibits similar results for both thicknesses tested. ANOVA showed that the traverse speed is more significant than abrasive mass flow rate for the material studied with respect to the surface finish. Thus, for a small material thickness, it is possible to use high traverse speed and low abrasive mass flow rate which makes the process more economical. 相似文献
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根据工业性切割的需要,对磨料水射流(AWJ)切割机制进行实验研究。通过射流与材料之间的相互作用过程,建立和验证了AWJ切割过程模型,AWJ切割过程主要是通过磨粒对材料的周期性切割磨削和变形磨削完成;验证分析了典型材料的切割特征(切割深度、切口宽度、冲蚀量)与切割变量(水压、靶距、切速等)的关系,以及磨料、材质两大因素的影响。实验研究结果对AWJ切割技术的开发与应用具有指导意义和实用价值。 相似文献
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The abrasive waterjet (AWJ) has primarily been used for net-shape sectioning of engineering materials. In this study an AWJ was adopted for the surface treatment of commercially pure titanium (cpTi) and the contribution of treatment parameters to material removal and the deposition of particles within the substrate were examined. The surface texture and material removal rate were analyzed using conventional techniques whereas the quantity of abrasive particles embedded within the cpTi surfaces was determined using energy dispersive X-ray analysis (EDXA). Parametric effects related to particle hardness were distinguished from a comparison of surfaces treated with Aluminum oxide, garnet, and crushed glass abrasives. According to an analysis of variance (ANOVA), treatment responses were found to be primarily dependent on the abrasive size, abrasive hardness, angle of incidence, and jet pressure. The minimum and maximum concentration of particles embedded in the AWJ treated cpTi (in percent surface area covered) was 2.5 and 21.6%, respectively. Particle concentration and mean particle size in the cpTi increased with abrasive size, angle of incidence and jet pressure; the particle concentration reached saturation at an angle of incidence near 80°. Although abrasive hardness was important to the treatment responses, an increase in hardness beyond 800 on the Rosiwal scale resulted in minimal changes in material removal or other features of the process. 相似文献
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固液两相磨粒流研抛工艺优化及质量影响 总被引:3,自引:0,他引:3
为研究磨粒流对异形腔孔内壁表面以及微小孔的研抛去毛刺等的作用效果,探讨了研抛过程中磨粒流各工艺参数与加工质量间的作用关系。以共轨管这种非直线管为研究对象,对磨粒流抛光共轨管过程进行数值模拟研究,探索各工艺参数对磨粒流研抛的影响。数值模拟结果表明:控制碳化硅体积分数可以改变磨粒流研抛过程中的粘温特性,从而可以控制磨粒流的研抛质量。然后采用正交方法设计实验方案,实验过程中,采集抛光过程中温度和粘度的变化数据,分析磨粒流研抛中粘温特性对磨粒流研抛质量的影响。试验与数值模拟结果表明,在磨粒流研抛共轨管过程中SiC的体积分数比出口压力的极差秩大,磨粒流研抛确实可有效改善工件表面质量。而且本文还进一步得出在本试验条件下,磨粒流研抛共轨管的最佳工艺参数:出口压力为5 MPa,SiC体积分数为0.25%,SiC目数为80,同时获得了表面粗糙度与体积分数的回归方程,可用于指导磨粒流实际研抛生产工作。 相似文献
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This article describes the experimental investigation of abrasive water jet (AWJ) cutting on AA5083-H32 aluminum alloy. In this study, the influence of varying the jet impingement angles and abrasive mesh sizes with different water jet pressures, on the output parameters for the AWJ cutting of the aluminum alloy, was analyzed. The experimental results found that the output parameters, namely, the depth of penetration, top kerf width, kerf taper ratio, surface roughness, and abrasive contaminations, were strongly influenced by the combined effect of oblique jet impingement angles and abrasive mesh sizes on AWJ. Also, it is noticed that oblique jet impingement angles have more influence on the output cutting responses than the normal jet impingement angle, and consequently, each abrasive mesh size has an influence on the different output responses for the AWJ cutting of AA5083-H32. Scanning electron microscope and microhardness tester were used to examine the different cutting regions of the kerf wall surfaces. The Energy-dispersive X-ray spectroscopy analysis was used to confirm the amount of silicon particles embedded in the AWJ cut surfaces. The adequacy checking of the experimental data for the AWJ cutting performance models has been analyzed through the residual plots using the statistical software. 相似文献