Grindability of γ -TiAl intermetallic compounds during …
Finally, the workpiece was driven by the ultrasonic sonotrode to generate high-frequency vibrations along the grinding direction. During ultrasonic vibration-assisted grinding processes, the whole system was in a state of resonance and thus the workpiece could obtain higher ultrasonic energy. Meanwhile, the ultrasonic vibration …
Process Performance of Low Frequency Vibratory Grinding …
An overall observation is that the application of low frequency vibration onto grinding resulted in a reduction in cutting forces by 30-40% on average. Fig. 3: Grinding as function of depth of cuts: a.- Normal, b.- Tangential Fig. 3 portrays the cutting forces in grinding the Inconel 718 as a function of the applied depth of cuts, where ...
Feasibility and tool performance of ultrasonic vibration …
For milling-grinding tests, the ER20 ultrasonic vibration tool holder was used. Before milling-grinding tests, the ultrasonic vibration frequency and amplitude were measured with an LV-S01 Single-Point Laser Doppler Vibrometer (SPLDV), as shown in Fig. 5.The vibration amplitude was adjusted by changing the tool overhang length or …
Effect of radial ultrasonic vibrations on wear properties of …
It is noted that radial ultrasonic vibration–assisted grinding (RUVAG) significantly reduces the grinding temperature due to the presence of high-frequency micro-amplitude vibrations, which is perpendicular to workpiece surface and the cyclic contact separation between the abrasive grains and workpiece .
Investigation of forced wheel spindle vibration influence on …
Vibrations in grinding are normally of two types, namely, self-excited vibrations and forced vibrations [32], [33]. Sufficient attention has been paid to studying the underlying mechanism of self-excited vibrations in grinding. ... the high-frequency vibration mainly occurs at 9333.4 Hz. At a grinding depth of 2.0 μm, the dominant high ...
Ultrasonic vibration-assisted grinding of silicon carbide …
During UVAFG, grinding force will change the resonance frequency of the ultrasonic vibration system [27]; that is, when the grinding force is large, the resonance frequency drifts are also large, changing the amplitude of the tool. In the current study, the resonance frequency of the ultrasonic tool holder moves farther from the input …
Ultrasonic vibration assisted grinding of hard and brittle …
Furthermore, as shown in Fig. 2, the grinding traces of multiple abrasives on micro-structured surfaces were simulated according to Eq. (2).The simulation parameters were: wheel diameter of 200 mm, grinding depth of 20 μm, spindle speed of 2000 rpm, feed rate of 0.6 mm/min, grain interval of 1 μm, vibration frequency of 25 kHz and …
Monitoring of Self-Excited Vibration in Grinding Process …
Grinding is a finish manufacturing process for high precision parts. As the part has high value added at this stage, anomalies and defects are unacceptable. Self-excited vibration or just chatter is an undesirable and complex phenomenon that occurs in grinding, as it may impair the performance of ground parts due to the negative effects such as poor …
Digital signal processing for self-vibration monitoring in grinding…
The results also showed that applying the R O P S T F T to the vibration signals allowed verifying that the frequencies corresponding to the chatter are multiples of the rotation frequency of the grinding wheels because the harmonic content generated by the rotation frequency of the grinding wheels changes with the progression of the …
Active control of high-frequency tool-workpiece vibration in micro-grinding
The high-frequency tool-workpiece vibration in micro-grinding plays a pivotal role in influencing surface generation in micro-grinding. To overcome the problems coming with the process vibration, this paper presents the implementation and testing of an active vibration control platform that can be used to suppress the high-frequency …
What is Vibration Grinding for CNC Machining?
– Super fine grinding. Use high frequency porcelain and polishing oil with polishing powder. During the vibration grinding process, the worker can sample check the machining condition of the grinding parts at any time. The time of grinding also varies according to the material of the work-piece being ground, process, etc.
Measuring vibration on precision grinding machines
The amount of vibration that would be considered excessive depends on the application. A precision cylindrical grinding operation may require displacement values below 0.03 mils (0.00003") …
Insights into scratching force in axial ultrasonic vibration …
The application of ultrasonic vibration in the grinding process can effectively decrease the grinding force, ... The ultrasonic vibration frequency was set to 28 kHz, with an amplitude of 6 μm, and a scratch depth of 2 μm, V s was configured to 0.1, 5, and 10 m/s, respectively.
Study on the influence of vibration characteristics on surface
The characteristic frequency of vibration was obtained by extracting the vibration characteristics of fluorophlogopite in quick-point grinding, and the characteristic frequency deviation rate was proposed to study the effect of vibration characteristics on surface roughness. Meanwhile, the influence of five process parameters, such as the …
The Effects of High-Frequency Vibrations in Grinding
The investigation indicates the possibility of applying high-frequency and even ultrasonic vibrations to selected operations to improve the grinding process. It would also appear to explain some of the well-known characteristics of grinding associated with the use by precision-grinder operators of sound or noise as an indication of the process.
Undeformed chip thickness with composite ultrasonic vibration …
In order to achieve high efficiency and low damage processing of hard and brittle materials, composite ultrasonic vibration-assisted face grinding (CUVAFG) has been proposed by comprehensively combining the high efficiency of axial ultrasonic vibration grinding (UVAG) and the low damage of elliptic ultrasonic vibration grinding …
Theoretical and experimental investigations of surface …
As a no-traditional processing method, ultrasonic assisted machining is applied to high frequency vibration for the tool or workpiece, ... Jiang et al. [13] studied the surface texture formation mechanism in ultrasonic vibration-assisted grinding process. The superposition influence induced by adjacent abrasives was analyzed and …
Effect of ultrasonic vibration on the machining performance …
Fig. 1 shows a schematic illustrating the processing principle of UPOAG. During grinding, a conductive grinding wheel ultrasonically vibrating in the axial direction at a frequency of f and a peak-to-peak amplitude of A p-p is rotated clockwise at a speed of n g, a workpiece moves right at a feed rate of V w, and a wheel depth of cut Δ is given …
AAC theory for ultrasonic vibration-assisted grinding
The setting of experimental parameters is to set the corresponding vibration angle within the range of experimental device parameters. The vibration frequency …
Wear behavior of white alumina and seeded gel abrasive …
After applying high-frequency vibration to the grinding process, the change in the material removal mechanism altered the law of abrasive wear. How abrasive particles interact with the workpiece underwent a high-frequency change, i.e., contact-separation to contact-separation. The rapid increase in the depth of impact shortened the scratching ...
Review of ultrasonic vibration-assisted machining in …
Moreover, to break through the application of ultrasonic vibration in the grinding and milling process, some novel ultrasonic vibration platforms have also been produced, which further expanded the application range of UVAM. ... a non-resonant elliptical vibrating device designed using low frequency vibration (<5 kHz) of the …
Study on ultrasonic elliptical vibration-assisted grinding …
Ultrasonic elliptical vibration-assisted grinding is illustrated in Fig. 1, where two sets of ultrasonic vibrations with the same frequency and different phases are applied in the XY plane of the workpiece to achieve two-dimensional ultrasonic vibration-assisted …
Effects of wheel spindle vibration on surface formation in …
Generally speaking, the high-frequency vibration, excited by the mass eccentricity of the spindle system, is the periodic signal in the steady grinding condition. The vibration frequency is independent of the wheel spindle speed. However, the low-frequency vibration may be caused by external vibration sources and diamond grain …
Ultrasonic vibration assisted grinding of CFRP composites: …
According to Eq. (2), the maximum vibration velocity v zmax goes up as ultrasonic vibration parameters (A × f) increase.In addition, the increasing overlap area can lead to better surface quality due to the application of vibration. Compared to the trajectory in conventional grinding (CG), the sinusoid traces result in increasing trajectory length …
Study on Grinding Force of Two-Dimensional Ultrasonic …
The grinding machine is TC500R high-precision vertical machining center, the maximum spindle speed is 20,000 r/min, the two-dimensional ultrasonic vibration …
Insight into the effect of vibration parameters on …
Currently, many scholars are conducting research on ultrasonic vibration-assisted grinding (UVAG) from both experimental and theoretical perspectives. ... High-frequency vibration leads to more frequent dislocation shrinkage and rebound, which may also lead to dislocation rebound and interact with dislocations near the processing surface [34 ...
Molecular dynamics simulations of ultrasonic vibration …
Grinding depth Amplitude of AVAG Amplitude of RVAG Amplitude of EVAG Vibration period/frequency of AVAG Vibration period/frequency of RVAG Vibration …
Modeling and experimental study of surface generation in …
The precision machining of Ti-6Al-4V (TC4) micro-channels remains a challenge due to the poor surface integrity and limited tool life. Ultrasonic vibration-assisted grinding (UVAG) is a promising technique that is being employed to enhance the achieved quality of Ti-6Al-4V micro-channels. Taking the wheel's wear and the springback of the …
Dynamic model of the grinding process
A non-linear dynamic model is developed to investigate the dynamic characteristics of the grinding process. The model demonstrates that different vibration frequencies result in qualitatively different behavior of the grinding machine. The relationship between grinding force variations and vibration frequency is revealed.
The Effects of High-Frequency Vibrations in Grinding
The results of the investigation definitely demonstrate that small vibrations at high frequencies can improve surface finish, can reduce temperature in the ground …