共查询到17条相似文献,搜索用时 125 毫秒
1.
本文在自行研制的超声振动珩磨装置基础上对高强度钢深孔进行了超声珩磨和普通珩磨的对比试验研究,通过工件内表面粗糙度、表面形貌的分析,得出了超声珩磨明显优于普通珩磨,并提出了超声振动珩磨独特的加工机理。文中还通过实验得出了超声振动珩磨的谐振频率随负载的增大而增加的结论,这与文献[8]的结论有所不同。 相似文献
2.
3.
功率超声珩磨装置功率超声珩磨装置就是将超声波发生器产生的超声频电振荡通过换能器转换为超声频纵向机械振动,变幅杆将换能器的纵向振动扩大后传给弯曲振动圆盘,挠性杆再将弯曲振动变成纵向振动后传给油石座,油石座带动与其烧结在一起的油石进行纵向振动,如图1所示。我们进行了直径47mm立式功率超声珩磨装置的设计及制造、装配,成功地完成了47mm孔径缸套珩磨系统,实际加工后,考核其尺寸精度均可达IT6级,表面粗糙度可达Ra0.1μm,圆度、圆柱度可达0.007mm,与国外同类装置相比,该超声波珩磨装置具有如下优点:①由于珩磨杆不振动,可节省能量… 相似文献
4.
5.
6.
超声振动珩磨加工是实现有色金属内孔表面高精度高效率的有效方法.其关键技术是解决包括超声变幅杆的优化设计、珩磨油石配方的合理设计、有色金属材料珩磨易拉伤、珩磨油易渗入超声系统及油石磨损后不便于快捷更换等问题.针对有色金属超声珩磨在应用过程中所存在的关键问题,进行了深入的研究,并提出问题解决的方法和手段,消除了制约有色金属... 相似文献
7.
8.
功率超声珩磨技术在发动机缸套的精密加工中能够得到较好的表面质量,其中珩磨力的大小与超声振动特点有关,是影响工件材料去除、磨削热及表面质量的重要因素之一。基于超声珩磨材料去除机理,考虑了油石表面磨粒分布规律,建立了包括材料切屑变形和磨粒与工件摩擦两种情况的超声珩磨力学模型。由力学模型仿真结果可知:功率超声珩磨磨削力与加工参数及加工过程中材料物理变化均有关,特别是材料应变率效应更加明显;在相同加工条件下,超声珩磨磨削力比普通珩磨平均降低50%以上,并且法向力与切向力比值增大,有利于材料的去除;超声振动能够减小磨粒与工件的平均动态摩擦系数,从而减小平均切向摩擦力大小,有利于提高工件表面质量;珩磨深度较主轴转速对珩磨力影响更大,当主轴转速高于620 r/min时,珩磨力开始逐渐减小。 相似文献
9.
10.
11.
12.
Honing is a surface finishing technology, which plays an important role in improving the surface quality and working performance of workpieces. However, with the extensive application of hard-to-machine materials and the increasing requirement for the surface properties of workpieces, the performance of conventional honing (CH) is becoming more and more difficult to meet the production needs. The ultrasonic vibration provides a way to overcome the technological constraints of CH and improve the machined surface properties. To realise the ultrasonic vibration of honing stone, a slotted block horn was used as a vibration transmission component and a supporting component of honing stone in this study. Finite element method was used to analyse and optimise the block horn to improve the uniformity of the amplitude on the output surface, to provide stable and efficient vibration for the honing stone. In this study, the effects of processing parameters on surface roughness in CH and ultrasonic-assisted honing (UAH) of stainless steel SUS304 were studied. The results indicated that the application of ultrasonic vibration in honing made a significant contribution to the formation of a dense punctiform morphology and reduction of the defects of the workpiece surface. Moreover, interactions between ultrasonic vibration, speed of revolution, and honing time in UAH make the changes of surface roughness much different from the CH. On the whole, for UAH, it is a feasible approach to improve the surface roughness by using a smaller amplitude, increasing the speed of revolution appropriately, and extending honing time. 相似文献
13.
超声珩齿指数型变幅器的动力学特性 总被引:15,自引:0,他引:15
超声振动可以有效地减小珩磨力,超声空化现象与切削液的共同作用对珩磨轮实现实时动态清洗,从而减小珩磨轮堵塞、提高加工效率,超声和珩齿进行复合加工是一种应用前景良好的齿轮精加工方法.超声珩齿的加工对象--齿轮,是一类特殊负载(直径大,厚度小),且对振动系统的加工频率影响大,在超声振动系统设计时,必须将变幅杆和齿轮组成变幅器进行全面考虑.鉴于此,根据应力耦合,将齿轮作为圆盘,采用指数型变幅杆,推导频率方程,对变幅杆的设计长度和变幅器振动频率进行数值分析,发现变幅杆的共振频率恰好是变幅器的失谐频率,变幅器的共振频率与变幅杆的固有频率也不相同,这能够为超声珩齿变幅器的设计提供理论依据. 相似文献
14.
讨论了按局部共振理论设计挠性杆、油石座子系统时超声振动珩磨系统的振动模式,提出了确定挠性杆、油石座子系统结构参数的试验设计方法。 相似文献
15.
16.
17.
Examination and Research of the Surface Topography of Ultrasonic Vibration Honing Nd-Fe-B 总被引:1,自引:0,他引:1
The mechanism of ultrasonic vibration honing Nd-Fe-B has been briefly elaborated after the introduction of the strategic significanoe of processing Nd-Fe-B.Based on the formation principle of Scanning Electrvnic NTicroscope (SFM),and at the exarrnination with the aid of SEM to the ultrasonic vibration honing Nd-Fe-B materials superficial microscopic topography,the paper discusses the new processing mechanism according to the SFM examination picture.The research indicates that as a result of supersonic high frequency vibration,the path of the abrasion extends at the same time,and the supersonic cavitation effect fonts the intense shock-wave,impacting Nd-Fe-B material's internal surface,providing the supersonic energy for the superficial abrasive dust's elimination,which directly explain tat the honing processing efficiency is entranced,and the processing surface rwghness is high. 相似文献