Study on Ti-6Al-4V Alloy Machining Applying the Non-Resonant Three-Dimensional Elliptical Vibration Cutting

Lu, Mingming; Zhou, Jiakang; Yan, Gu; Han, Jiang; Zhao, Dongpo

doi:10.3390/mi8100306

Cited by 32 publications

(19 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides these properties, the non-toxicity of titanium makes it also useful for biomedical applications (implant devices, pacemakers, artificial hearts) [2]. However, the high hardness and low machinability of Ti alloys affect their feasibility by conventional processes [3], encouraging the research for new methods, as pointed out in Reference [4], for vibration cutting. Machinability problems can be overcome by additive manufacturing, that includes a variety of technologies, applied for more than 20 years for porous structures and prototypes, some of which promise to become commonly used to produce near-net-shape components of complex geometry reducing production time and cost [5].…”

Section: Introductionmentioning

confidence: 99%

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Aliprandi

Giudice

Guglielmino

et al. 2019

Metals

View full text Add to dashboard Cite

Thanks to their excellent mechanical strength in combination with low density, high melting point, and good resistance to corrosion, titanium alloys are very useful in many industrial and biomedical fields. The new additive manufacturing methods, such as Electron Beam Powder Bed Fusion based on the deposition of metal powders layers progressively molten by electron beam scanning, can overcome many of the machining problems concerning the production of peculiar shapes made of Ti alloys. However, the processing route is strictly determinant for mechanical performance of products, especially in the case of Ti alloys. In the present work flat specimens made of Ti-6Al-4V alloy produced by Electron Beam Powder Bed Fusion (or Electron Beam Melting) have been built and post-processed with the purpose of obtaining good tensile and creep performance. Preliminarily, the process parameters were set according to literature evidence and machine producer recommendations, validated by the results of a thermal analysis, aimed at satisfying the best processing conditions to reduce defects, as unmelted regions, microstructure coarsening or porosity, that are detrimental to mechanical behavior. Subsequently, Hot Isostatic Pressing and surface smoothing were considered, respectively, in order to reduce any internal porosity and lower roughness. Microstructure of the investigated specimens was characterized by optical and scanning electron microscopy observations and by X-ray diffraction measurements. Results show enhanced tensile behavior after the hot pressing treatment that allows to relieve stresses and reduce defects detrimental to mechanical properties. The best ductility was obtained by the combined effects of machining and densification. Creep test results verify the beneficial effects of surface smoothing.

show abstract

Section: Introductionmentioning

confidence: 99%

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Aliprandi

Giudice

Guglielmino

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

“…Improved differential evolutionary (IDE) algorithm identification nonlinear system flow chart (2) For each individual in the group, according to the initial value of the model given in Equation (1),̂(t)is obtained and fitness function fitness E = ∑ N t=1 t is calculated, and then, find out X best and X pbest of the population. (3) In each cycle, V i is calculated.…”

Section: Figurementioning

confidence: 99%

“…Elliptical vibration cutting (EVC) technology has been widely used in machining difficult-to-cut materials, 1-3 creating of microstructure, 4 producing of precision macroscale components, 5 and other processing fields. EVC technology has the advantages of inhibiting diamond tool wear, reducing cutting force effectively, and reducing cutting heat, 2 which is widely regarded as one of the most potential machining method to improve the machinability of difficult-to-cut materials. However, with EVC technology research progresses, it also encounters technical bottlenecks.…”

Section: Introductionmentioning

confidence: 99%

“…InFigure 3, the b/a/d/c represents the undetermined coefficients of Hammerstein-Winner model. For the Hammerstein-Winner model, assumptions have N learning samples, the expected outputs are y(1), y(2), … , y(t), … , y(N), and the output of the model arê(1),̂(2), … ,̂(t), … ,̂(N). The learning process is corrected the coefficients of the Hammerstein-Winner model by minimizing the mean-square error, so that̂(t) is close to y(t).…”

mentioning

confidence: 99%

See 1 more Smart Citation

Improved differential evolutionary algorithm for nonlinear identification of a novel vibration‐assisted swing cutting system

Wang

Zhao

et al. 2019

Adaptive Control & Signal

Self Cite

View full text Add to dashboard Cite

Vibration-assisted swing cutting (VASC) is a new precision machining technology. VASC not only inherits the characteristics of EVC intermittent cutting but also alleviates the problem of EVC residual height. However, system identification is key if you want to achieve precise control. In order to solve this problem, a new improved differential evolutionary (IDE) algorithm is proposed to identify and optimize the Hammerstein-Wiener model parameter in VASC system. IDE algorithm is applied to transform the identification problem of the model into the optimization problem in the parameter space, and the optimal solution of the parameter of the model in the parameter space is obtained. Meanwhile, the IDE algorithm and the conventional five differential evolutionary algorithms perform performance comparison tests on six different test functions. The test results show that the IDE algorithm is strengthening the global search capability, accelerate the convergence rate to the global optimal solution, and indicate that the IDE algorithm can be effectively applied to the parameter optimization of Hammerstein-winner model. Based on the input and output data collected from the experiment, the accuracy of the identification model can be up to 98%, which prove the superiority of the proposed IDE algorithm for system identification. KEYWORDSHammerstein-Wiener model, improved differential evolutionary algorithm, system identification, test functions, vibration-assisted swing cutting 1066

show abstract

“…Three-dimensional elliptical vibration cutting (3D-EVC) is an ultra-precision cutting technology with significant development potential. Its unique characteristics of intermittent cutting, friction reversal, and ease of chip removal can improve the machinability of difficult-to-cut materials in the cutting process [1][2][3]. Since 3D-EVC technology was first introduced in 2005, the research field has mainly focused on the mechanism of cutting, the design of 3D-EVC apparatus, path planning of the tool, specific applications, and so on.…”

Section: Introductionmentioning

confidence: 99%

Chatter Identification of Three-Dimensional Elliptical vibration Cutting Process Based on Empirical Mode Decomposition and Feature Extraction

Chen

Zhao

et al. 2018

Applied Sciences

Self Cite

View full text Add to dashboard Cite

Three-dimensional elliptical vibration cutting (3D-EVC) is one of the machining methods with the most potential in ultra-precision machining; its unique characteristics of intermittent cutting, friction reversal, and ease of chip removal can improve the machinability of materials in the cutting processes. However, there is still not much research about the chattering phenomenon in the 3D-EVC process. Therefore, based on the empirical mode decomposition (EMD) technique and feature extraction, a chatter identification method for 3D-EVC is proposed. In 3D-EVC operations, the vibration signal is collected by the displacement sensors and converted to frequency domain signal by fast Fourier transform (FFT). To identify tool cutting state using the vibration frequency signal, the vibration signals are decomposed using empirical mode decomposition (EMD), a series of intrinsic mode functions (IMFs), so the instantaneous frequency can be reflected by the vibration signals at any point. Then, selecting the primary IMFs which contain rich chatter information as the object in feature extraction identification, and two identification indexes, that is, the mean square frequency and self-correlation coefficient, are calculated for the primary IMFs by MATLAB software, to judge the chatter phenomenon. The experimental results showed that the mean square frequency and self-correlation coefficient of the three cutting states increase with the increase in the instability of the cutting state. The effectiveness of the improved chatter recognition method in 3D-EVC machining is verified. Appl. Sci. 2019, 9, 21 2 of 15 increase of the spindle speed, small cutting depth, and great performance of the diamond tool. But the damage accompanying chatter is mainly reflected in reducing the accuracy of the work-piece of the optical parts, increasing the surface roughness of the work-piece, speeding up the wear on the cutting tools, and causing damage to the spindle of the machine tool [6,7].EVC is an intermittent cutting technology, which has the characteristics of friction reversal, tool wear suppression, and easy chip removal. However, there is no specific literature on the identification of chatter in the 3D-EVC cutting processes [8]. In 2011, Ma et al. proposed that the two-dimensional EVC technology had a certain inhibitory effect in chatter suppression compared to the traditional cutting method, and the effectiveness of the effect of chatter suppression was verified by experiment, but this was limited to two-dimensional elliptical vibration cutting [9]. In 2016, Jung et al. collected the real-time signal from the 2D-EVC process and analyzed the chatter phenomenon according to the frequency domain analysis and surface of the work-piece [10]. They obtained the friction chatter mechanism of the plough force during the initial period of each ellipse movement cycle and suppressed the chatter vibration by changing the guiding angle in 2D-EVC process. It was also the earliest research on identification and suppression of the chatter phenomenon...

show abstract

Study on Ti-6Al-4V Alloy Machining Applying the Non-Resonant Three-Dimensional Elliptical Vibration Cutting

Cited by 32 publications

References 31 publications

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Tensile and Creep Properties Improvement of Ti-6Al-4V Alloy Specimens Produced by Electron Beam Powder Bed Fusion Additive Manufacturing

Improved differential evolutionary algorithm for nonlinear identification of a novel vibration‐assisted swing cutting system

Chatter Identification of Three-Dimensional Elliptical vibration Cutting Process Based on Empirical Mode Decomposition and Feature Extraction

Contact Info

Product

Resources

About