共查询到19条相似文献,搜索用时 281 毫秒
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《制造技术与机床》2017,(10)
针对聚晶金刚石复合片(PDC)在加工过程中硬度高、精度低等难题,在半精磨阶段采用ELID磨削技术对其进行加工试验以研究其去除机理及存在的缺陷。为解决ELID磨削PDC存在的缺陷,在精加工阶段对PDC进行了抛光试验。通过采用二次通用旋转组合方法对影响PDC表面粗糙度的各工艺参数进行抛光试验设计。首先利用DPS数据处理系统软件对试验结果进行分析得到PDC表面粗糙度二次回归数学模型及各工艺参数对PDC表面粗糙度的单因素和交互作用影响规律。然后利用lingo软件优化得到PDC抛光最佳工艺参数为抛光压力80 kPa,抛光盘转速1 200r/min,抛光液磨粒粒度2μm,抛光时间45 min,并在此最佳工艺参数下抛光PDC获得表面粗糙度为15 nm的已加工表面。 相似文献
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聚晶金刚石复合片因具有超高硬度、耐磨性和良好的热稳定性,被广泛用作切削加工的刀具材料。利用PCD复合片制作刀具时,和传统加工工艺相比,激光抛光可以获得更良好的加工特性。为探究PCD复合片的激光抛光工艺特性,获取最佳表面粗糙度,利用飞秒已抛光区域的线粗糙度,系统地研究了激光功率、扫描速度、扫描间距的水平变化对粗糙度和抛光效率的影响规律。采用正交试验方法对3个因素水平进行优化组合,同时对飞秒激光抛光PCD的作用机理进行初步探究。结果表明:影响粗糙度的主要因素为扫描速度,选用7 MW激光功率、1 000μm/s扫描速度、12μm扫描间距的工艺参数可以获得粗糙度为33.95 nm的优良PCD复合片。 相似文献
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《机械工程学报》2017,(15)
通过在MK9025A型曲线磨床上开展微晶玻璃陶瓷磨削试验,研究可加工陶瓷表面成形机制和表面粗糙度。结果表明,可加工陶瓷材料磨削时其材料去除具有延性去除、延脆性去除、脆性去除三种模式,以硬脆材料相关系数Mr改进可加工陶瓷未变形切屑厚度模型,提出延性域系数η0、延脆性域系数η1,用以构建延性-延脆性和延脆性-脆性两个临界磨削深度模型。根据可加工微晶玻璃陶瓷单因素磨削试验,提出了复合磨削因子Q,基于以上未变形切屑厚度模型和两个临界磨削深度模型建立表面粗糙度模型,得到了表面粗糙度与复合磨削因子之间的关系,利用标准差检验模型精度。正交试验验证结果表明,可加工微晶玻璃陶瓷表面粗糙度试验值与所建立的表面粗糙度模型理论值吻合度较高。 相似文献
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不锈钢镜面抛光机理及结构设计 总被引:1,自引:0,他引:1
提出了用电解—不织布复合加工方法对1Cr18Ni9Ti进行镜面抛光机理,用正交设计方法中的极差分析法,对降低工件表面粗糙度的工艺参数进行了优化,并研制出便携式复合加工抛光机。 相似文献
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T. R. Ablyaz K. R. Muratov M. M. Radkevich L. A. Ushomirskaya D. A. Zarubin 《Russian Engineering Research》2018,38(6):491-492
The applicability of electrolytic plasma surface polishing to complex components produced by selective laser melting (SLM) is analyzed. By electrolytic plasma polishing by electrolyte spraying, the surface quality of components produced by SLM may be improved. This technology is found to decrease the surface roughness from Ra = 5.6 μm to 1.4 μm. The optimal pressure of the electrolyte jet is 0.02–0.05 MPa. At high pressures, the process becomes unstable. By electrolytic plasma polishing on the basis of electrolyte jets, uniform external and internal surface roughness of components produced by SLM may be ensured. 相似文献
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首先介绍超声波表面光饰加工的原理,以航空工业中常见铝合金材料2D12及LC9为研究对象,采用超声波加工和常规加工对比的方法,研究超声波表面光饰加工技术对铝合金疲劳性能、表面组织及镀覆性能的影响。通过试验对比可以得出结论:超声波表面光饰加工使表面产生压应力,优化表层组织,大幅度提高表面粗糙度;表面硬质阳极氧化和镀铬后,镀(化)层质量不低于常规加工的试样;经过超声波表面光饰加工的试件疲劳寿命有较大幅度的提高。 相似文献
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LED蓝宝石衬底的表面质量会极大影响到后续外延质量,进而影响到LED器件性能。蓝宝石研磨片经Al2O3磨粒粗抛液、SiO2磨粒精抛液下进行化学机械抛光(CMP),最终表面经原子力显微镜(AFM)所测表面粗糙度达到0.101nm,获得亚纳米级粗糙度超光滑表面,并呈现出原子台阶形貌。同时,通过使用Zygo表面形貌仪、AFM观察蓝宝石从研磨片经Al2O3粗抛液、SiO2精抛液抛光后的表面变化,阐述蓝宝石表面原子台阶形貌的形成原因,提出蓝宝石原子级超光滑表面形成的CMP去除机理。通过控制蓝宝石抛光中的工艺条件,获得a-a型、a-b型两种不同周期规律性的台阶形貌表面,并探讨不同周期规律性台阶形貌的形成机理。 相似文献
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Pei-Lum Tso Shuo-Young Ho 《The International Journal of Advanced Manufacturing Technology》2007,33(7-8):720-724
The primary consumables in the chemical mechanical polishing (CMP) process are the polishing pad and the slurry. Among those
consumables, the polishing pad significantly influences the stability of the process and the cost of consumables (CoC). Furthermore,
the small holes on the pad surface will be filled by the reactant from the CMP process, and the surface of the pad will deposit
hard glazing gradually. The glazing not only reduces the ability of absorbing slurry of the pad, but it also causes scratching
on the work piece. In order to maintain the stability of the CMP process and return to an ideal pad surface status, we must
condition the pad according to a regular time schedule. At the same time, if we use different pad conditioning factors, the
dressing rate of the CMP pad will be different. Most important of all, we have to decrease the pad material abrasion due to
the pad conditioning process. In conclusion, if we can understand the influence of the dressing rate and conditioning factors
effectively, it will be useful for maintaining CMP process stability, extending pad life, and reducing CoC and non-processing
time. 相似文献
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电解-机械-磁力便携式抛光机的研制 总被引:2,自引:0,他引:2
针对具有高硬度、高韧性、高强度和低导热性的大型平面或曲面的难加工材料的工件,应用电解—机械—磁力复合抛光工艺原理,研制了便携式抛光机。试验证明,将与工件母材机械性能无关的电解作用和柔性抛光片的机械作用,以及磁场磁力作用的相结合,提高了抛光的效率和质量,解决了不便搬运的大型难加工材料工件的就地抛光问题。 相似文献
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超薄石英晶片超精密抛光实验的研究 总被引:1,自引:0,他引:1
为了解决超薄石英晶片高表面质量的加工问题,以及寻求一种高效低成本的加工方法,将一种新的超精密抛光工艺应用到超薄石英晶片的加工中。给出了加工过程中的抛光原理,制定出了在研磨和抛光过程中的最优实验条件,并对加工后超薄石英晶片的粗糙度和厚度做了详细的分析;讨论了磨粒的尺寸对表面粗糙度和材料去除率的影响,同时对加工过程的材料去除机理做了论述,以表面粗糙度和厚度为评价目标对超薄石英晶片的加工特性和表面质量进行了评价。研究结果表明:使用该实验的工艺加工超薄石英晶片可以得到厚度为99.4μm、表面粗糙度为0.82nm的超光滑表面;同时,该研究还发现通过延长抛光时间可以减小石英晶片的表面残余应力,可有效控制石英晶片四角“翘曲”现象,得到更好的平面度和平行度。 相似文献
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The abrasive is one of the important influencing factors during the chemical mechanical polishing (CMP) process. Although α-alumina is one of the most commonly used sapphire polishing abrasives due to its high hardness, it often results in surface damage. To receive lower surface roughness and high material removal rate, a common approach is to modify the surface of alumina. In this work, a series of alumina/metatitanic acid composite abrasives with core–shell structure were synthesized. The CMP performances of the pure alumina and alumina/metatitanic acid core–shell abrasives on sapphire substrates were investigated after polishing under the same conditions. Experimental results indicate that the alumina/metatitanic acid core–shell abrasives can not only improve the surface quality, but also further enhance the material removal rate. Furthermore, through the X-ray photoelectron spectroscopy test, this study investigated the chemical effect mechanism of the alumina/metatitanic acid core–shell abrasives in sapphire CMP. The results show that solid-state chemical reactions occur between metatitanic acid shell and sapphire surface during CMP process. We also investigated the mechanical friction mechanism through abrasive wear and adhesive wear. 相似文献
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An experimental study of the effects of ultrasonic vibration on grinding surface roughness of C45 carbon steel 总被引:1,自引:1,他引:0
Haifeng Chen Jinyuan Tang Wei Zhou 《The International Journal of Advanced Manufacturing Technology》2013,68(9-12):2095-2098
The effects of an ultrasonic vibration on grinding surface roughness are investigated experimentally, and the test equipment is described. The controllable ultrasonic energy is superimposed to the work piece on grinding and the kinematics of the grinding process is discussed. Experimental results obtained by applying the ultrasonic vibration to the grinding process are presented, showing that the application of ultrasonic vibration to the grinding process can lower the work piece surface roughness. 相似文献