Forthcoming articles


International Journal of Mechatronics and Manufacturing Systems


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International Journal of Mechatronics and Manufacturing Systems (19 papers in press)


Regular Issues


  • Experimental Investigations into Rotary Magnetic Field and Tool assisted Electric Discharge Machining using Magneto Rheological Fluid as Dielectric   Order a copy of this article
    by Lokesh Upadhyay, M.L. Agarwal, Pulak M. Pandey 
    Abstract: The present study focuses on the development of an electric discharge machining method that used magneto rheological fluid as dielectric and rotary magnetic field assisted electric discharge tool. The work aims to improve performance of electric discharge machining by utilizing the combined effect of magneto rheological fluid with rotating electrode and magnetic field. This developed hybrid machining process has been designed to attain higher material removal rate for improving production rate. In this process, the surface roughness has been found higher as compared to when magnetic field and tool was kept stationary. M2 grade high speed steel workpiece was used for parametric study. The experimentation was performed to evaluate the effect of percentage contribution of alumina particles, discharge current, duty cycle, and pulse on time effect on material removal rate and surface roughness. The experimental findings demonstrated that EDM process with rotary magnetic field and tool with magneto rheological fluid as dielectric resulted in an increased material removal rate as compared to EDM with static magnetic field and tool. The following findings were found significant for a certain limit of carbonyl iron percentage in magneto rheological fluid.
    Keywords: Electric discharge machining; roughness; magneto rheological fluid; alumina.

  • Modeling and Analysis of Tool Deflections in Tailored Micro End Mills   Order a copy of this article
    by Samad Nadimi Bavil Oliaei, Yigit Karpat 
    Abstract: The deflection of micro end mills has a detrimental effect on surface quality of the machined micro components and adversely affects the achievable dimensional and geometrical tolerances. In this paper, the analysis and modeling of tool deflections of tailored micro end mills have been considered. The tool deflections are obtained using analytical models as well as finite element simulations, and verified using a dedicated measurement setup, which uses a capacitive sensor with a nanometer resolution for static tool deflection measurements. The optimization of the micro end mill geometry has been performed to determine optimum neck taper angle and transition radius of the single edge micro end mill to have minimum tool deflections. With the developed model, tool failure predictions for a given process parameter set can be performed and it can be used for better micro milling process planning.
    Keywords: Micromilling; Tailored Micro End Mill; Tool Deflection; Optimization; Tool Failure.

  • Performance of different abrasive tools in electrochemical honing of coated surfaces   Order a copy of this article
    by Harpreet Singh 
    Abstract: This paper highlights on the honing characteristics of various abrasive tool materials during the precision finishing of EN52 coated surface of the engine valve face using electrochemical honing (ECH) process. The investigation on various abrasive tool materials in ECH are first proposed, and it may help to enhance the process performance characteristics of ECH. It is a new technique, which in spite of being used in some industrial plants, in particular to smooth surfaces and is still not fully described due to the variety of the factors affecting the process. More information about the process is required, especially the honing related parameters, such as abrasive tool pressure, abrasive material, and abrasive size. Special shaped honing tools were designed and fabricated to study the present aspects. Two different types of abrasive tool material (Al2O3 and NiCr) for honing operation were used while ECH of EN52 work surface. The results of the experiments are finally furnished with the aim to generalize a useful guideline for the user to enable proper selection of conditions for obtaining good surface quality.
    Keywords: abrasive tool; ECH; EN52; engine valve face; HVOF; product recovery; surface finish.

  • Online correction of thermal errors based on a structure model   Order a copy of this article
    by Xaver Thiem, Bernd Kauschinger, Steffen Ihlenfeldt 
    Abstract: This article deals with the structure model based correction approach for thermal errors at machine tools. Structure models are physically based models of the thermo-elastic behaviour of machine tools. Input data of the model are technological loads captured in the machine control. The article focuses the experimental validation of the online correction on the example of a demonstrator machine (parallel kinematic). A finite element model with reduced model order is used as structure model. Besides the implementation of the correction approach the parameter adjustment of the model is described. The conducted experiments show that up to 87% of the maximal thermo-elastic error of the ball screw axes of the machine can be compensated with the proposed correction approach.
    Keywords: thermal error; machine tool; correction; compensation; structure model; online; control; parallel kinematics; accuracy; ball screw; FEM; finite element method; temperature; deformation.

Special Issue on: ICHSM2016 Advances in Machine Tools and Monitoring Systems

  • Diversity of Assembly Error Migration and Its Solution Model for Heavy Duty Machine Tool   Order a copy of this article
    by Bin Jiang, Yunpeng Gu, Tiantian He, Shouzheng Sun, Chongmin Jiang 
    Abstract: Aiming at the ever-changing assembly error along with operation in the large scale assembly space, the diversity of machine tool assembly error migration and its operation route are characterized by making use of the correspondence relationship between joint surface error and operation distance. The formation and retention of assembly error are respectively revealed by the forward migration and the reverse migration of assembly error. Furthermore, the delayed step function of assembly error migration is constructed to recognize the potential control operation of error migration. Based on the response surface method, the solution model of assembly error migration is established to reveal the diversity of assembly error migration process and the effect of multiple operations. Finally, the design method of assembly process about heavy duty machine tool is proposed, and its effectiveness is verified by gantry-moving type turning-milling machining centre.
    Keywords: heavy duty machine tool; assembly error; assembly operation; error migration; delayed step function; response surface method.

  • Experimental Investigation on Surface Quality in Ultrasonic Vibration Assisted High Speed Grinding of BK7 Optical Glass   Order a copy of this article
    by Ming Zhou, Peiyi Zhao, Huang Shaonan 
    Abstract: Knowledge of surface formation mechanism plays a key role in implementing precision machining of optical glass. In order to evaluate the surface quality and to explore surface formation mechanism, in this paper, ultrasonic vibration assisted grinding (UVAG) experiments were carried out on BK7 optical glass by employing diamond wheel. Quite a few micro and macro brittle-fractured pits of different shapes, sizes and morphologies were observed on machined surfaces by using scanning electron microscope. Spindle rotation speed, feed rate, grinding depth and ultrasonic vibration amplitude had be found to exert significant effects on the surface generation and machined surface roughness in ultrasonic vibration assisted grinding of this kind of materials. It was also demonstrated that the value of machined surface roughness would become much smaller if the pits size was small. Based on the observation and classification of pits morphologies, the machined surfaces forming mechanism was extensively investigated in this work.
    Keywords: Surface formation; Optical glass; Ultrasonic vibration; Grinding.

  • Characteristics of the self-organization in high-speed turning of high-strength alloy steel   Order a copy of this article
    by Youfei Fang, Guangming Zheng, Zongwei Niu, Xiang Cheng, Yingzhao Yu 
    Abstract: Tool life and wear mechanism of the multi-layer coating tools are studied by high-speed turning of high-strength alloy steel 300M. Micro-morphology and element distribution of the tool worn surface are observed through scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The emphasis is on the self-organization characteristics of the microcosmic surface of worn tools. The results show that adhesive layer and oxygen-containing film are the characteristics of self-organization structures of the coating tools. The CVD-TiCN-Al2O3 coating is suitable for high-speed turning of 300M. The wear mechanisms of the coated tool include adhesion, abrasion, diffusion, oxidation, coating flaking and chipping. The adhesive wear is found at various cutting stages. And the formation of self-organization structures is determined by the diffusion and oxidation. The coated tool of creating self-organization structures exhibits the higher wear resistance, especially intensive tribological compatibility which can extend the stable wear stage.
    Keywords: tool life; wear mechanism; coated tool; self-organization; oxygen-containing film; 300M.

  • Background Texture Suppression and Defect Extraction of High-Speed Milling Surface Image   Order a copy of this article
    by You-hang Zhou, Yong Li, Xian-wei Shi, Tuo Kong 
    Abstract: This paper proposed a method to extract the machine defect from the surface images of high-speed milling workpiece, and reduced the impact of workpiece surface background texture. Firstly, Wiener Filtering method is used to denoise the high-speed milling workpiece surface images. Then the potential texture images are obtained by using the nonnegative matrix decomposition algorithm for learning denoising images unsupervisedly. Next, original images and potential texture images are used to convolute with the imaginary part function of Gabor filter respectively, and apply Image Differencing method to obtain the energy difference images. The binary defect images are extracted after the Threshold Segmentation method is applied. Application example shows the capability of this method to extract machine defect.
    Keywords: machine defect; background texture; Wiener Filtering; Threshold Segmentation.

  • Synthesis and characterization of AlMgB14 and AlMgB14-Ni3Al composites   Order a copy of this article
    by Zhou Yumei, F.L. Zhang, K. Bai, T. Zhang, H.P. Huang, S.H. Wu, S.M. Luo 
    Abstract: Materials with higher hardness and lower friction coefficients with steel have been proposed as candidates for strategic use in the application fields of cutting tool and friction reduction materials. Aluminum magnesium boride (AlMgB14) and its composites are excellent candidates for these purposes. The impurity of MgAl2O4 is normally formed in the synthesized AlMgB14 because of oxygen and oxide involved from raw materials and processing, so an extra amount of Al and Mg beyond the stoichiometric ratio of AlMgB14 were introduced into the raw elemental powders to synthesize AlMgB14 in an atmosphere of argon at 1500 ℃. The AlMgB14-Ni3Al composites were also synthesized by hot pressed sintering at 1450 ℃ and 1600 ℃ separately. The microstructure and mechanical properties of AlMgB14 and AlMgB14-Ni3Al composites were also examined. The results showed that extra addition of 5 wt.% Al and 5 wt.% Mg can reduce the production of MgAl2O4 in the formation of AlMgB14. Besides of AlMgB14 and MgAl2O4 , Ni3Al and NiAl are identified in the AlMgB14-Ni3Al composites, the hardness and fracture toughness of AlMgB14-Ni3Al composites are decreased with higher content of Ni3Al due to the present of Ni3Al and NiAl phase.
    Keywords: AlMgB14; Ni3Al; Microstructure; Hot pressed sintering; Mechanical properties.

  • Characterization for Differential Wear between Left and Right Flank Faces in Turning Large Pitch Internal Thread   Order a copy of this article
    by Bin Jiang, Tong Xu, Zhe Li, Yunpeng Gu, Tiantian He 
    Abstract: In turning large pitch internal thread, there are obvious differences between the wear on the left and right flank faces of the same cutting tool, which decrease the tool life and the consistency of machining surface quality of threads. The force equations of tools left and right cutting edges are used to reveal their differences in mechanical condition. Adopting axial direction cutting method, the flank wear experiment is carried to obtain its characteristics of left and right cutting edges and the time-domain signals of tool vibration. During the formation of differential wear of left and right flank faces, the stress state and the vibration of cutting tool are analyzed. Finally, the distribution functions of flank wear widths are established to reveal the change characteristics of wear width along the cutting edge and the cutting stroke and quantitatively describe the wear processes and differences of left and right flank faces.
    Keywords: turning; axial stratified cutting; internal thread; large pitch; tool; left and right cutting edges; left and right flank faces; different wear; contact relationship between tool and workpiece; cutting stroke; length of cutting edge; wear width; distribution function.

Special Issue on: Advances in Laser Based Manufacturing

  • Laser Surface Melting of Al-12Si-4Cu-1.2Mn Alloy   Order a copy of this article
    by Woldetinsay Jiru, Mamilla Ravi Sankar, Uday Shanker Dixit, Hengcheng Liao 
    Abstract: This work investigated mechanical and metallurgical properties of Al-12Si-4Cu-1.2Mn high temperature alloy after laser surface melting using CO2 laser. The effect of laser specific energy on the quality of remelted surface was studied. Two kinds of substrate materials were compared solutionized heat treated at 510 oC and as-cast. The dendrite microstructure and refined grains with reduced average grain size improved the mechanical properties of laser surface remelted alloy. The microhardness of the alloy increased by 2.5 times for heat treated and 2.6 times for as-cast samples. The ultimate tensile strength increased by 70% and 23% for as-cast and heat treated alloys, respectively. Scratch resistance improved and coefficient of friction reduced. In general, low laser specific energy provided better results. Overall good mechanical properties were obtained when as-cast samples were remelted by CO2 laser at 45-50 J/mm2 laser specific energy.
    Keywords: Mechanical property; dendrite structure; laser surface melting; aluminum alloy; ultimate tensile strength; microhardness; CO2¬ laser; scratch test; laser specific energy; microstructure; solutionization.

Special Issue on: Advances in Laser-Based Manufacturing

  • Intelligent Scan Trajectories for Pulsed Laser Polishing   Order a copy of this article
    by Madhu Vadali, Chao Ma, Xiaochun Li, Frank Pfefferkorn, Neil Duffie 
    Abstract: The objective of this work is to generate irregular, smooth, adaptive laser scan trajectories for pulsed laser polishing. Traditionally pulsed laser polishing, like other surface finishing processes has used zig-zag scan paths. Zig-zag trajectories are simple in nature, are comprised of sharp turns, the dynamics of the positioning system are not considered, and more importantly are not adaptable because the path generation is independent of surface condition. In this paper, the authors present an intelligent scan trajectory generation scheme that can overcome these limitations. These trajectories are based on the artificial potential fields method of path planning that take the surface condition into account. Computer simulations are presented to illustrate the characteristics of the path and guidelines are developed for choosing the trajectory generation parameters. Experiments show that these trajectories result in marginal improvements in the average surface roughness when compared to the traditional zig-zag trajectories, all the while overcoming the limitations. Finally, smooth, irregular scan trajectories are generated for a micro end milled Ti6Al4V surface with a feature that needs no polishing, thus illustrating the versatility of the trajectory generations scheme.
    Keywords: Laser; Polishing; Intelligent; Path planning; Surface Roughness; Zig-zag; Artificial fields; Marangoni flows; Smoothness; Micro Melting.

  • Metallurgical and tribological investigation of microscale fiber laser based surface hardening   Order a copy of this article
    by Yogesh Wagh, Santanu Paul, Neeraj Gupta, Ramesh Singh 
    Abstract: Laser surface hardening (LSH) is a useful technique to improve the hardness and wear resistance of the surfaces of critical structural components. Limited work has been reported in the literature on micro-scale LSH using fiber lasers, which provide precise control over the targeted areas. In this work, a comprehensive analysis of the mechanical, metallurgical and tribological responses of the various laser hardened patterns of EN-8 steel at different process conditions was conducted. A 100 W continuous wave fiber laser with specially designed optics varying the beam between ~200-900 μm was used for micro-scale hardening. Electron Backscatter Diffraction (EBSD) technique was used to investigate the microstructural variation and the hardness values were measured using micro hardness tester (Shimadzu-HMV). Additionally, to measure the tribological response, four different hardened patterns were analyzed using the pin on disk set-up (DUCOM wear and friction monitor TR-20LE). The preliminary results revealed improved surface hardness values with increase in percentage overlap due to the formation of martensite. Furthermore, it was observed that the average wear rate of hardened specimen decreases by ~91% as compared to the unhardened specimen. The results revealed an inverse relationship between friction force and percent-hardened area, with minimum friction force obtained for fully hardened pattern.
    Keywords: Laser hardening; fiber laser; EBSD; wear and friction force.

  • Effect of niobium on microstructure-property relationship in H11 hot-work tool steel via wire- and powder-based laser metal deposition   Order a copy of this article
    by Mahesh Teli, Fritz Klocke, Kristian Arntz, Kai Winands 
    Abstract: This paper presents an effect of niobium (Nb) on the microstructure-property relationship in H11 hot-work tool steel. Various amounts of Nb powder were introduced into the molten pool of H11 wire through a novel wire- and powder-based laser metal deposition (WP-LMD) process. With the increase in Nb content upto 3.45 wt.%, the average grain size of H11 decreased from 14.3
    Keywords: Laser metal deposition; AISI H11 wire; Niobium powder; Microstructure refinement; Toughness; Hardness.

  • Optimization of Laser cutting of SS 430 Plate using Advanced Taguchi Entropy Weighted based GRA Methodology   Order a copy of this article
    by Velayutham Kathiresan 
    Abstract: SS 430 thin plates are extensively used in medical equipment, decorative productsand kitchen appliances. In this research work, the 16 straight cutting profiles on SS 430 plates were done by using Nd:YAG laser cutting processes. Experimental works were conducted to examine the influence of processing conditions of laser cutting such as power, cutting velocity and gas pressure on response characteristics like HAZ (heat affected zone) size, recast layer thickness and micro hardness. A novel integrated Taguchi-entropy weighted based Grey relational analysis (GRA) approach has been employed to attain the supreme qualities of laser cutting in this effort. The entropy method is used to measure the weight to each response characteristics. Additionally, ANOVA technique is used to identify the significant process parameters. The obtained results point out that these approaches convincing to optimize the laser cutting practices.
    Keywords: Laser cutting; SS430 plates; Taguchi-GRA; Entropy method; Multi-objective optimization; HAZ; Recast layer; Micro hardness.

  • Laser dressing of grinding wheels A review   Order a copy of this article
    by Manish Mukhopadhyay, Pranab Kumar Kundu 
    Abstract: Grinding is one of the commonly used surface-finishing operations in the manufacturing industries to produce surfaces with close tolerances, high precision, and high quality. Selection of appropriate dressing technique with optimized dressing conditions can result in effectively opening up of the cutting edges of the abrasive grits. Several experimental investigations have hailed the laser dressing to be prosperous in generating improved grinding wheel topology that results enhanced grindability. This paper presents a comprehensive review on the developments and advances of the novel laser dressing techniques, starting from a brief introduction of basic concept, material removal mechanism, experimental arrangements, and advantages over mechanical dressing techniques. The progress in diverse laser dressing, focusing on material aspects, is thoroughly reviewed and discussed.
    Keywords: Grinding; Laser dressing; Conventional wheel; c-BN wheel; Diamond wheel.
    DOI: 10.1504/IJMMS.2018.10013117
  • An Experimental Investigation into Fiber Laser Micro-Drilling of Quartz   Order a copy of this article
    by Abhishek Sen, Biswanath Doloi, Bijoy Bhattacharyya 
    Abstract: In the present experimental study, percussion micro-drilling on quartz is carried out by Ytterbium (Yb3+) doped 50W fiber laser system in order to find out the effects of various process parameters such as laser power, pulse frequency, duty cycle and assist air pressure (process parameters) on the response criteria, i.e., taper angle, circularity for the entrance holes and heat affected zone (HAZ) thickness. The larger and smaller diameter of the micro-holes at the entry side are measured as 124.13
    Keywords: quartz; micro-drilling; fiber laser; HAZ; taper angle; circularity.

  • Microstructure evolution in thin sheet laser welding of titanium alloy   Order a copy of this article
    by Bikash Kumar, Daniel Kebede, Swarup Bag 
    Abstract: The present work describes the effect of cooling rate on microstructural morphology and mechanical properties of laser welded thin Ti-6Al-4V alloy. The numerical investigation has been carried out to predict the weld pool geometry at different heat input by pulse Nd:YAG laser. The cooling rate is estimated from simulated time-temperature history. Double-ellipsoidal volumetric heat source model has been implemented in finite element based numerical model to represent the laser source. The solidified structure of Ti-6Al-4V is complex and may acquire a large variety of microstructural transformation with different morphology of mainly α and β phases depending upon the particular cooling rate followed. Three different transformational zones i.e., diffusional, α-martensitic, and mixed zone are found in the welded joint for the estimated range of cooling rate. Massive diffusion-controlled nucleated secondary lamellae α-transformation has found in the range of 52325 K/s which is below the critical cooling rate (~ 410 K/s). Volume fraction of α-martensitic phase in the fusion zone increases with cooling rate. The acicular microstructure in the fusion zone and near heat affected zone (HAZ) has been observed at high cooling rate (> 410 K/s). High cooling rate associated with low heat input (or high welding speed) results in finer α^martensitic lath size with high aspect ratio. However, slow cooling rate results in increase of volume fraction of primary α morphology. It is obvious that the dimensional variation of α lamellae structure plays an important role on mechanical properties of the welded joint. Substantial improvement of the tensile properties with increase in cooling rate is characterized by the volume fraction of primary α-phase, and the α+β lamellae spacing which decreases with increase in cooling rate. The hardness profile rapidly ascends from partially transformed HAZ to fusion zone due to increased amount of α-martensitic morphology. It is also perceived that the grain size rises continuously with increase in overall heat input in the fusion zone and HAZ.
    Keywords: Ti-6Al-4V alloy; laser welding; thermal analysis; cooling rate; microstructure; mechanical properties; grain size.

  • Advances in Laser Forming of Metal Foam: Mechanism, Prediction and Comparison   Order a copy of this article
    by Tizian Bucher, Y. Lawrence Yao 
    Abstract: Laser forming is a well-studied process that has successfully been used to form sheet metal. More recently, attempts have been made to use laser forming to bend metal foams. While several studies reported that forming of metal foams is possible, it was found that the process window is fundamentally different, and many well-established concepts from sheet metal laser forming do not apply or require modification. This paper reviews the advances in metal foam laser forming and compares the acquired knowledge with the well-established knowledge of sheet metal laser forming. Differences in the bending mechanism are discussed, and the process windows are analyzed in detail. Additionally, key differences in the numerical approaches are discussed, namely the impact of the model geometry and the incorporation of density-dependent material data. Finally, subjects requiring further investigation are reviewed.
    Keywords: Laser forming; metal foam; bending mechanism; process window; numerical simulation.