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超声砂带研抛的实验研究 总被引:2,自引:0,他引:2
超声砂带研抛是在开式砂带研抛中叠加超声振动而形成的一种复合加工工艺。文中阐述了超声砂带研抛的工作方式、基本原理和系统设计,对砂带振动状态进行了测试和分析,并对比了超声砂带研抛和普通砂带研抛后的工件表面糙度及其加工效率。 相似文献
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主轴架振动性能对砂带磨床加工质量具有重要的影响,论文采用多级优化方法对主轴架进行结构优化设计.基于变密度法对主轴架进行拓扑优化设计,获取主轴架最佳拓扑结构;采用自适应响应面法对主轴架详细模型进行板厚尺寸优化,得到主轴架的最终优化方案,并对优化前、后主轴架的模态和谐响应进行对比分析.研究结果表明:优化后主轴架的固有频率明显提高,优化后基频比优化前提高了4.61倍,有效避开了驱动电机的激振频率;优化后主轴架的谐响应最大变形明显减小,最大位移最大值仅为原来的1.18%~1.52%.因此主轴架优化结果对提高砂带磨床加工质量具有重要意义. 相似文献
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《精密制造与自动化》1987,(4)
超声砂带精密磨削技术超声砂带精密磨削就是把超声频率振动叠加到开式砂带磨削上,达到提高加工质量和效率的目的。文章分析了超声砂带精密磨削机理,并通过超声振动对加工表面粗糙度和加工效率的影 相似文献
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1.机床的选型汽车行业的典型零件——曲轴,对于这类零件往往要进行高效、大批量、高精度的加工。为此我厂专门设计出数控曲轴铣床,专门用于加工曲轴的主轴颈和连杆颈,或只加工主轴颈或连杆颈。此机床适用于加工曲轴的专业化工厂。1.1机床型号及外观图(见图1-1)图1-1机床外观图S1-305曲轴数控铣床这是一种高效率的半自动机床,手动装卸工件,采用液压自动卡紧,可以一次加工主轴颈和连杆颈,或只加工主轴颈或连杆颈,工件加工过程由CNC控制自动完成。在全部加工过程中,工件即不转动也不移动,而是靠刀盘移动进入切削位置,然后绕被加工轴颈旋转一… 相似文献
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分析了Cu-3镍铜合金砂带磨削加工过程中,砂带粒度和磨削用量的不同对磨削加工效率、工件表面质量和砂带磨损的影响。采用氧化铝磨料砂带在不同的砂带线速度或磨削压力下对镍铜合金进行了工艺试验,对材料去除量、工件表面粗糙度和砂带磨损量进行了测量。研究表明:增加砂带线速度和磨削压力可在一定程度上提高材料去除率和磨削比;随着磨削压力的增大,工件表面粗糙度呈增大趋势;随着砂带粒度的增大,工件表面粗糙度呈减小趋势;砂带线速度为25m/s,磨削压力为43N,砂带粒度为P240时,镍铜合金综合磨削效果最好。 相似文献
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异形截面零件的切削与砂带磨削 总被引:1,自引:0,他引:1
介绍异形截面零件的精密切削和砂带磨削等加工技术,分析切削时刀具角度的变化情况及其改进措施,同时介绍砂带磨削的成形原理、特点及超声振动砂带磨削在异形截面零件加工中的应用,指出精密切削和砂带磨削是异形截面零件最有效的加工方法之一。 相似文献
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针对自由式砂带抛光中砂带的接触状况,建立螺杆受力的力学模型,利用有限元分析方法分析了砂带与螺杆的接触应力以及砂带的变形情况,得到螺杆所受的正压力和砂带自身应力、应变的变化情况;研究双砂带抛光对螺杆中径抛光质量的改善情况,也为相关参数的选取和理论计算提供了依据。 相似文献
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Traditional low-pressure abrasive flow polishing can produce highly smooth surfaces, but the efficiency of this method is too low for polishing of hard-brittle materials parts. This paper proposes a novel cavitation rotary abrasive flow polishing (CRAFP) method. The energy generated from the cavitation bubble collapse is used to increase the kinetic energy of the abrasive particles in the low-pressure abrasive flow and the motion randomness of the abrasive particles near the wall; thereby, the efficiency and quality of low-pressure abrasive flow polishing are improved. The CRAFP mechanism was first introduced, and then the characteristics of the CRAFP process were investigated using computational fluid dynamics (CFD)-based abrasive flow simulation. Subsequently, a single-crystal silicon wafer polishing test was carried outperformed to verify the validity of the CRAFP method. The polishing results were compared with those of the traditional low-pressure abrasive flow polishing method. After 8 h of polishing using the CRAFP method and the traditional low-pressure abrasive flow polishing method, the surface roughness of the workpiece decreased to7.87 nm and 10.53 nm, respectively. Furthermore, by starting at similar initial roughness values, the polishing time required to reduce the roughness to 12 nm was 3.5 h and 6 h, respectively. The experimental results demonstrated that CRAFP can satisfy the surface requirements of single-crystal silicon (Ra < 12 nm) and exhibit high polishing efficiency and good quality. 相似文献
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磨粒流研抛伺服阀阀芯喷嘴的冲蚀磨损分析 总被引:2,自引:0,他引:2
为了研究固液两相磨粒流对伺服阀阀芯喷嘴的研抛性能,从冲蚀磨损的角度对比分析了不同磨粒硬度下的磨粒流研抛效果。利用计算流体力学方法,求解分析了磨粒流研抛伺服阀阀芯喷嘴时流场中的冲蚀磨损特性,采用电子显微镜以及扫描电镜仪检测伺服阀阀芯喷嘴零件经磨粒流研抛前后的表面粗糙度和表面形貌。实验结果表明:采用碳化硅磨粒和白刚玉磨粒加工后的伺服阀阀芯喷嘴主干通道、交叉孔以及小孔区域的粗糙度分别由1.1μm、0.823μm、0.743μm降低为0.735μm、0.721μm、0.571μm和1μm、0.747μm、0.696μm。在本试验中碳化硅磨粒的加工效果优于白刚玉磨粒,即具有高磨粒硬度的磨粒研抛效果好。检测结果显示,磨粒流研抛技术可有效改善伺服阀阀芯喷嘴的表面质量;提高磨粒硬度可提高磨粒流的研抛效果;伺服阀阀芯喷嘴的交叉孔以及小孔区域的表面质量要高于主干通道的表面质量。 相似文献
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Effects of particle size, polishing pad and contact pressure in free abrasive polishing 总被引:12,自引:0,他引:12
The objective of this research is to better understand the mechanisms of material removal in the free abrasive polishing process. Experiments were carried out to understand the effects of particle size, polishing pad and nominal contact pressure on the wear rate and surface roughness of the polished surface. A theoretical model was developed to predict the relationship between the polishing parameters and the wear rate for the case of hard abrasive particles sandwiched between a soft pad and a workpiece (softer than the abrasive particles). Experimental results and theoretical predictions indicate that the wear rate increases with an increase in particle size, hardness of polishing pad and nominal contact pressure, and with a decrease in elastic modulus of the polishing pad. Surface roughness increases with an increase in particle size and hardness of polishing pad, and nominal contact pressure has little effect on the roughness. A dimensionless parameter, wear index which combines all of the preceding parameters, was introduced to give a semi-quantitative prediction for the wear rate in free abrasive polishing. It is also suggested that when polishing hard material, in order to achieve a high materials removal rate and a smooth surface, it is preferable to use diamond as the polishing particles because of their high deformation resistance. 相似文献
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针对燃料电池微通道反应器的沟槽底面抛光技术难题,开展磨料水射流沟槽抛光仿真与试验研究。采用FLUENT软件,对不同工艺参数下沟槽底部剪切力分布进行了数值模拟;根据仿真结果进行316L不锈钢材料的单沟槽抛光工艺试验,检测分析不同抛光参数下单沟槽底面形貌、材料去除率以及表面粗糙度的变化规律;根据单沟槽底面几何精度和表面粗糙度需求,获得最佳的沟槽抛光参数,进行单沟槽抛光验证试验。结果表明:当磨料粒径5μm,抛光液浓度3%,射流压力0.35 MPa,喷射距离8 mm时沟槽底面抛光效果最佳,抛光后粗糙度Ra达到0.11μm,沟槽底面轮廓的RMS误差为2.92μm。试验研究结果为磨料水射流抛光微通道反应器等沟槽类零件提供指导依据。 相似文献
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砂带6轮抛光不锈钢长管 总被引:1,自引:0,他引:1
介绍了砂带磨轮的制作和砂带6轮抛光的工作原理,并对砂带磨轮抛光加工的工艺参数及砂带磨轮的使用寿命进行了分析,成功解决了不锈钢长管抛光中易烧伤和刚度不足的问题。并使粗、半精和精抛光加工一次完成,降低了表面粗糙度,提高了表面质量,满足了不锈钢长管的抛光要求。 相似文献