纳米-二氧化锆陶瓷超声波辅助椭圆振动磨削的系统设计和实验研究外文翻译资料
2022-08-15 04:08
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纳米-二氧化锆陶瓷超声波辅助椭圆振动磨削的系统设计和实验研究
赵博，张宝琪，王晓波， 毕文波
摘 要
针对纳米-二氧化锆陶瓷等硬质易碎材料的低韧性、高硬度和加工难度，设计了一种新型的超声波辅助椭圆振动磨削（UAEVG）系统，以提高其可加工性和磨削性质量。超声波磨杯形工具变压器（UGCTT）的整体频率方程由集成非谐振器推导出优化了设计方法和锥形喇叭的长度。通过有限元软件模拟磨料颗粒的轨迹，并通过超声波共振试验验证。最后，通过UAEVG纳米-二氧化锆陶瓷的实验，探讨了UAEVG方法对其表面形态、粗糙度和残余应力的影响。结果表明，当喇叭长度为65mm时，变压器具有良好的振动模式。仿真和超声波共振试验结果表明，磨料颗粒在长角径向平面上以椭圆形周期性移动，径向和纵向振幅分别为AR=7.5mu;m和AL=3.1mu;m。纳米-二氧化锆陶瓷的磨削实验表明，UAEVG可以改变常规磨削（CG）的磨削机制，减少磨屑和材料断裂的产生。当磨削深度增加时，UAEVG下材料的塑料加工比明显高于CG，形成较好的表面地形。表面粗糙度随磨削深度和进给速率的增加而增加，表面压应力随磨削深度的增加而减小。与CG相比，UAEVG可将表面粗糙度降低约30%，使残余压应力降低约20%，实现更好的磨削表面质量。因此，可以得出结论，UAEVG可以扩大塑料加工领域，在一定程度上提高纳米-二氧化锆陶瓷的表面完整性和疲劳强度。
关键词 杯形工具变压器;椭圆振动;无谐器设计方法;纳米-二氧化锆陶瓷;表面粗糙度;表面残余应力
第一章 介绍
陶瓷材料具有高强度、高硬度、耐高温、耐磨性好、化学防刺性好等特点，在航空航天、机械、石油、核工业等领域具有广阔的应用前景[然而，由于陶瓷材料的脆性及其对内部缺陷的敏感性，在使用过程中将发生突然和灾难性的断裂[3，4]。另一方面，由于陶瓷材料具有低塑性韧性和高硬度，容易出现脆性加工痕迹，如材料剥落和开裂在处理过程中。在传统的加工中，会产生大量的表面缺陷和严重的表面损伤，难以达到高精度、高效率、高可靠性的加工效果[5，6]。由于陶瓷配子的寿命很大程度上取决于其表面完整性，因此通过适当的加工获得卓越的加工效率和表面质量非常重要。陶瓷材料的应用方法[7]。
超声波辅助磨削是一种对复合、硬质和脆性材料有效的精加工过程[8-10]。应用于砂轮或工件的超声波振动可以在相对短的时间内释放大量能量。通过改变材料去除机制，降低了磨削力和磨削热量，提高了表面磨削质量[11-13]。Bian等人[14]建立了一维超声振动下的非局部构成模型，研究了纳米复合陶瓷的研磨过程。结果表明，超声波振动能大大降低磨削力，提高磨削表面质量。王等人提出了Si3N4陶瓷超声振动辅助磨削系统匹配的数学模型。 数学模型表明，磨削力随振幅、频率和磨削速度的增加而减小，并随着磨削深度和进给速率。Uhlmann等人研究了冷却润滑剂在超声波辅助磨削中冷却润滑剂对高性能陶瓷的可加工性的影响。结果表明，超声波振动辅助磨削的工艺性能受晶粒尺寸、粘结类型和冷却润滑剂压力的影响。赵等人[18]分析了纳米复合材料陶瓷的脆性、韧性和材料去除机制，建立了纳米复合材料临界韧性和磨削深度的公式陶瓷，并在超声波和普通工艺下进行研磨实验。
虽然纳米的外观兹罗2陶瓷提高了机械性能和可靠性。陶瓷材料自a一定程度其骨折韧性是还低和硬度是高。劳沃斯和自。[19]研究工艺材料互动在超声辅助磨削的兹罗2基于陶瓷材料。它可以被获得工具支架系统对振动幅度有显著影响。不同的材料去除机制可以被的b服务对于大工具振动振幅。基于上冲动理论和骨折力学五和自。[20]分析联系模型的二维超声振动的磨料粒子和工件。的实验表明只有当磨削深度小于临界磨削深度和确定了适当的磨削参数。那.等人[21]建立了基于超声波振动辅助磨削划 伤测试和运动学分析的兹罗2陶瓷和验证有效性的通过实验设计进行模型。结果表明，超声波辅助磨削能提高表面质量。工作皮这和减少穿的磨削头。梁和自。[22,23]实现二维椭圆振动磨削技术的单晶体硅由设计压 电陶瓷椭圆振荡器与两者伸缩和弯曲模式。的结果表明磨削力的二维振动磨削是大大减少表面粗糙度显著降低，表面质量明显提高。陈等人 [24]建立a莫的的特定磨削能源自预测关键未变形芯片厚度对于延展到脆性过渡行为椭圆超声辅助磨削中的单晶硅。分析表明，延展模式磨削在微米级可以被实现时轴振动振幅是以上3微米.
综上所述，一些研究人员对陶瓷等硬脆材料的磨削表面形成机制、材料去除机理和微特性进行了研究， 振动辅助磨削，验证了超声辅助磨削在加工硬脆材料方面的优越性。虽然对二氧化锆陶瓷材料的研究取得了很大进展，但二氧化锆陶瓷的去除机理和功能特性尚处于探索阶段。结合上述研究，为探索更优良的纳米陶瓷研磨技术，解决纳米-二氧化锆陶瓷等硬质脆性材料的加工难题，设计了新的UAVEG系统。本文旨在探讨UAVEG对纳米-二氧化锆陶瓷材料的加工机理、加工效率、磨削表面质量和疲劳强度的影响，从而提高纳米-二氧化锆陶瓷材料的加工性能和应用范围。首先，本研究采用非谐振设计方法，将UGCTT作为一个整体进行设计。然后，通过有限元仿真和超声波共振试验，验证了磨料颗粒的椭圆振动轨迹，并测试了变压器的振动性能。最后，通过纳米-二氧化锆陶瓷UAVEG的实验，对超声波辅助椭圆振动对其表面形态、粗糙度和残余应力的影响进行了实验探索。
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Abstract
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Keywords times;times;times;；times;times;times;；times;times;times;；times;times;times;（小4号Times New Roman字体）
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目 录
1.2 times;times;times;times; 1
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1.2.2 times;times;times;times;times;times; 1
第2章 times;times;times;times;times;times;times; 2
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绪论
引言
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