scholarly journals Development of a Low-Frequency Vibration-Assisted Drilling Device for Difficult-to-Cut Materials

2021 ◽  
Author(s):  
Feng Jiao ◽  
Yuanxiao Li ◽  
Dong Wang ◽  
Jinglin Tong ◽  
Ying Niu
Keyword(s):  
Titanium Alloy ◽  
Elastic Recovery ◽  
Structural Parameters ◽  
Low Frequency ◽  
Load Condition ◽  
Flexure Hinge ◽  
Drilling Process ◽  
Secondary Damage ◽  
Low Frequency Vibration ◽  
Drilling Temperature

Abstract In the drilling process of difficult-to-cut materials, conventional drilling has resulted in various problems such as high drilling temperature and poor machining quality. Low-frequency vibration-assisted drilling has great potential in overcoming these problems since broken chips are generated. In order to promote the application of low-frequency vibration-assisted drilling device in machining difficult-to-cut materials. In this paper, a low-frequency vibration-assisted drilling device is developed by using a novel ring flexure hinge as the elastic recovery mechanism. First, based on the theory of elastic mechanics and mechanical vibration, the stiffness of the ring flexure hinge is designed theoretically, and the influence of its structural parameters on its deflection is analyzed. And then the correctness of the theoretical design is further verified by static and dynamic simulation and stiffness test. Finally, the vibration performance of the device is tested under no-load condition, and the actual drilling test is conducted to verify the drilling performance. The results show that the device could realize the axial low-frequency vibration with constant frequency-to-rotation ratio and amplitude stepless adjustment and present good working stability under no-load and load conditions. In the actual drilling test of titanium alloy and carbon fiber reinforced plastic (CFRP)/ titanium alloy laminated structure, the device under appropriate processing parameters breaks the titanium alloy chip into small pieces and reduces the drilling temperature by 44% and inhibits the secondary damage of CFRP. It is demonstrated that the device could meet the actual processing requirements. And it also provides guidance for the design of low-frequency vibration-assisted drilling device.

Numerical Model for Prediction of Cutting Forces in a Vibratory Drilling Process

2014 ◽  
Vol 1016 ◽  
pp. 215-220 ◽  
Author(s):  
Nawel Glaa ◽  
Kamel Mehdi ◽  
Moez Ben Jaber
Keyword(s):  
Cutting Forces ◽  
Three Dimensional ◽  
Low Frequency ◽  
Cutting Parameters ◽  
Forced Vibrations ◽  
Drilling Process ◽  
Drilling Operation ◽  
Low Frequency Vibration ◽  
Cutting Force Components ◽  
Force Components

The drilling operation is considered by manufacturers as complex and difficult process (rapid wear of the cutting edge as well as problems of chip evacuation). Faced with these failures, manufacturers have shifted in recent years towards the drilling process assisted by forced vibrations. This method consist to add an axial oscillation with a low frequency to the classical feed movement of the drill so as to ensure good fragmentation and better chip evacuation. This paper presents a model for prediction of cutting forces during a drilling operation assisted by forced low-frequency vibration. The model allows understanding the interaction between the tool and the workpiece and identifying numerically the three-dimensional evolution of the cutting force components generated by the vibratory drilling operation. The effects of cutting parameters, tool parameters and those of forced vibrations on the cutting forces distributions will be discussed.

Development of Fixing System for 2-Axis Micro Deep Drilling Assisted by Low Frequency Vibration

2014 ◽  
Vol 625 ◽  
pp. 149-154 ◽  
Author(s):  
Ivan Burdukovskyi ◽  
Jun'ichi Kaneko ◽  
Kenichiro Horio
Keyword(s):  
Amplitude Ratio ◽  
Low Frequency ◽  
Two Dimensions ◽  
Drilling Process ◽  
Vibration Source ◽  
Deep Drilling ◽  
Machining Time ◽  
Hard Materials ◽  
Low Frequency Vibration ◽  
Vertical Displacements

Micro deep drilling of hard materials is required to involve step feed in process that grows up machining time. To increase the step feed, a method with low frequency vibration (frequency ~190 Hz, amplitude ~10 μm) by oscillating of workpiece has been proposed. Previous study is focused on method of 1-axis drilling process assisted by low frequency vibration. Introducing the method with low frequency vibration to 2-axis drilling process on a curved surface is required to oscillate the workpiece in two dimensions. Purpose of our study is to design fixing system with the 2-dimansional low frequency vibration. Vibration source is needed to change for providing the 2-dimansional vibration. Fixing system for 2-dimensional vibration (FS2DV) consists of two vibration sources in horizontal and vertical directions with spring systems along it action. The 2-dimensional vibration is controlled by amplitude ratio of the vibrations from each source. As a result, we have succeeded low frequency vibration of the workpiece with assigned direction. The resulting vibration is verified (measuring of instantaneous horizontal and vertical displacements).

scholarly journals The effect of MQL on tool wear progression in low-frequency vibration-assisted  drilling of CFRP/Ti6Al4V stack material

2021 ◽  
Author(s):  
Ramy Hussein ◽  
Ahmad Sadek ◽  
Mohamed Elbestawi ◽  
Helmi Attia
Keyword(s):  
Tool Wear ◽  
Vibration Amplitude ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Chip Thickness ◽  
Low Frequency ◽  
Drilling Process ◽  
Machining Parameters ◽  
Geometrical Accuracy ◽  
Low Frequency Vibration

Abstract In this paper, the tool wear mechanism in low-frequency vibration-assisted drilling (LF-VAD) of carbon fiber reinforced polymer (CFRP)/Ti6Al4V stacks has been proposed using variably machining parameters. Based on the kinematics analysis, the effect of vibration amplitude on the chip formation, uncut chip thickness, chip radian, and axial velocity was presented. Subsequently, the effect of LF-VAD on the cutting temperature, tool wear, delamination, and geometrical accuracy was presented for different vibration amplitude. The LF-VAD with the utilization of minimum quantity lubricant (MQL) resulted in a successful drilling process of 50 holes, with a 63 % reduction of the cutting temperature. For the rake face, LF-VAD reduced the adhered height of Ti6Al4V by 80 % at low cutting speed and reduced the crater depth by 33 % at the high cutting speed. On the other hand, LF-VAD reduced the flank wear land by 53 %. Furthermore, LF-VAD showed a significant enhancement on the CFRP delamination, geometrical accuracy, and burr formation.

Enhanced ride comfort using nonlinear seat suspension with high-static-low-dynamic stiffness

2020 ◽  
Vol 51 (4-5) ◽  
pp. 63-76 ◽  
Author(s):  
Chun Cheng ◽  
Yan Hu ◽  
Ran Ma
Keyword(s):  
Ride Comfort ◽  
Structural Parameters ◽  
Dynamic Stiffness ◽  
Damping Ratio ◽  
Low Frequency ◽  
Coupled Model ◽  
Human Model ◽  
Vehicle Speed ◽  
Seat Suspension ◽  
Low Frequency Vibration

To attenuate the low-frequency vibration transmitted to the driver, a nonlinear seat suspension with high-static-low-dynamic stiffness is designed. First, the force and stiffness characteristics are derived. The nonlinear suspension can achieve the quasi-zero stiffness at the static equilibrium position when the structural parameters are properly designed. Then, a car-seat-human coupled model which consists of a quarter car model, a seat suspension, and a 4 degree-of-freedom human model is established to predict the biodynamic response of the driver. Finally, the isolation performance of the high-static-low-dynamic stiffness seat suspension under two typical road excitations is evaluated separately based on the numerical method. The effects of stiffness ratio, damping ratio, and vehicle speed on the ride comfort are investigated. The results showed that the nonlinear seat suspension outperforms the equivalent linear counterpart and can achieve the best ride comfort when the quasi-zero stiffness condition is satisfied.

Vibration Isolation Characteristics of Euler Strut Spring Used in Low Frequency Vibration Isolation System

2012 ◽  
Vol 248 ◽  
pp. 475-480
Author(s):  
Guan Jun Zhang ◽  
Xiang Zhu ◽  
Ran Xu ◽  
Tian Yun Li
Keyword(s):  
Vibration Isolation ◽  
Structural Parameters ◽  
Low Frequency ◽  
Resonant Frequencies ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Low Frequency Vibration ◽  
Steel Material ◽  
Internal Resonant ◽  
Spring Maximum

Recently, the Euler strut is used as the supporting spring in the low frequency isolation. An Euler spring is a column or strut of steel material which is compressed elastically beyond its buckling load, which makes the ratio of the isolated mass to the mass of the supporting spring maximum, and greatly increasing the internal resonant frequencies of the isolator. In this research, the unique mechanical properties and the expressions of the displacement transmissibility of the Euler strut are deduced. The influences of structural parameters of the strut on the stiffness and vibration isolation characteristics are investigated in detail. The results show that the Euler strut has the potential in low frequency vibration isolation, and the length and breadth of the strut can influence the stiffness, transmissibility and critical loading mass respectively.

scholarly journals Deformation behavior and microstructure in the low-frequency vibration upsetting of titanium alloy

2022 ◽  
Vol 299 ◽  
pp. 117360
Author(s):  
Jun Lin ◽  
Catalin Pruncu ◽  
Lihua Zhu ◽  
Jiao LI ◽  
Yadi Zhai ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Deformation Behavior ◽  
Low Frequency ◽  
Low Frequency Vibration

Drilling force model for forced low frequency vibration assisted drilling of Ti-6Al-4V titanium alloy

2019 ◽  
Vol 146 ◽  
pp. 103438 ◽  
Author(s):  
Haojun Yang ◽  
Wenfeng Ding ◽  
Yan Chen ◽  
Sylvain Laporte ◽  
Jiuhua Xu ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Low Frequency ◽  
Force Model ◽  
Drilling Force ◽  
Low Frequency Vibration

scholarly journals The Effect of MQL on Tool Wear Progression in Low-Frequency Vibration-Assisted Drilling of CFRP/Ti6Al4V Stack Material

2021 ◽  
Vol 5 (2) ◽  
pp. 50
Author(s):  
Ramy Hussein ◽  
Ahmad Sadek ◽  
Mohamed A. Elbestawi ◽  
M. Helmi Attia
Keyword(s):  
Tool Wear ◽  
Cutting Temperature ◽  
Cutting Speed ◽  
Chip Thickness ◽  
Low Frequency ◽  
Burr Formation ◽  
Drilling Process ◽  
Machining Parameters ◽  
Geometrical Accuracy ◽  
Low Frequency Vibration

In this paper, the tool wear mechanisms for low-frequency vibration-assisted drilling (LF-VAD) of carbon fiber-reinforced polymer (CFRP)/Ti6Al4V stacks are investigated at various machining parameters. Based on the kinematics analysis, the effect of vibration amplitude on the chip formation, uncut chip thickness, chip radian, and axial velocity are examined. Subsequently, the effect of LF-VAD on the cutting temperature, tool wear, delamination, and geometrical accuracy was evaluated for different vibration amplitudes. The LF-VAD with the utilization of minimum quantity lubricant (MQL) resulted in a successful drilling process of 50 holes, with a 63% reduction in the cutting temperature. For the rake face, LF-VAD reduced the adhered height of Ti6Al4V by 80% at the low cutting speed and reduced the crater depth by 33% at the high cutting speed. On the other hand, LF-VAD reduced the flank wear land by 53%. Furthermore, LF-VAD showed a significant enhancement on the CFRP delamination, geometrical accuracy, and burr formation.

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