International Journal of Mechatronics and Manufacturing Systems
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International Journal of Mechatronics and Manufacturing Systems (4 papers in press)
Solution method of the kinematic function scheme for reconfigurable machine tools based on kinematic transformation by Guodong Yi, Ye Gu, Shuyou Zhang Abstract: The kinematic function scheme is the basis of the reconfigurable machine tool (RMT) design. However, the diversity and complexity of the scheme are not conducive to the realization of reconfiguration. To solve this problem, this paper proposes a solution method of the kinematic function scheme based on kinematic transformation. A tool-feature pose matrix is established based on an analysis of the relationship between machining surface features and machining tools to obtain a kinematic function expression that shows the kinematic requirements of the machine tool. The kinematic feature domain and the kinematic transformation domain are used to describe the motion type, motion direction and other information to describe the kinematic parameters of the module. The solution method of the kinematic function chain based on the kinematic decomposition and module combination is proposed to establish the kinematic function scheme of a RMT. Keywords: reconfigurable machine tool; kinematic function scheme; tool-feature pose matrix; kinematic function expression; module; kinematic transformation; kinematic function chain.
Effect of grinding depth on surface topography by considering vibrations and a force prediction model by Mingxia Kang, Lu Zhang, Wencheng Tang Abstract: Little consideration has been given to vibrations when the effect of grinding process parameters on the surface morphology is studied. Taking a grinding force as the intermediate variable, influences of grinding depths on the surface topography are investigated more accurately with considering vibrations in this paper. Firstly, a novel grinding force prediction model is proposed through amending the Malkin model by integrating with contact arc length and abrasive grain contact angle two factors. Secondly, vibrations of the feed platform and the grinding wheel shaft are analyzed by means of threshold filtering and median filtering. It is found that the vibration displacement in the x-direction of the wheel axis remains substantially between 140-150 nm, while in the y-direction, it increases with the grinding depth. Finally, three-dimensional surface topographies with different grinding depths are investigated. It is observed that the deeper crack, more pronounced defects and a coarse texture are gradually generated as the grinding depth increases. And parameters like Sa, Sq, Sku, Ssk are more representative of the real grinding quality of workpiece surface than Ra, Rq, Rsk, Rku. Keywords: contact arc length; abrasive grain contact angle; grinding force; surface topography; vibrations.
Statistical analysis of the parameters in SPIF/DPIF in the thickness reduction in an experimental geometry by Ferney-Alexis Giraldo-Castrillon, Yessica-Maria Giraldo-Castrillon, Gabriel-Jaime Paramo-Bermúdez Abstract: The objective of the present study was to determine the thickness reduction during the incremental deformation process with two techniques: SPIF/DPIF. A geometric structure was built using software (CAD), and the paths simulated in a software (CAM). Experimental design of a full factorial type was made 2^3, for each technique, eight simulations, and three replicas. The variables studied in each experiment were the wall angle, the depth increase and the diameter of the tool. The three parameters are associated with the incremental deformation, although the angle was the most influential and the interaction between them in both techniques was significant. There was no difference in the comparative analysis between the different points in which the reduction of the thickness measured, just as neither one technique showed to be superior to the other. The angle of 68 Keywords: metadata,incremental forming; SPIF; DPIF; design of experiments; CAD; CAM; dieless.
Experimental investigation in Photochemical Machining process through Response Surface Methodology for manufacturing of micro mould by Devendra Agrawal Abstract: Photochemical Machining (PCM) is used as one of the best micromachining technique for machining of difficult-to-cut material with appropriate machining parametric combinations. Ferric chloride is used as etchant for machining of Stainless Steel-304.In the present study, the effect of process parameters such as time of etching, temperature of etchant and concentration of etchant on Material Removal Rate (MRR), Surface roughness (Ra), Undercut (Uc) and Etch Factor (EF) in PCM of SS-304 is evaluated by using Response Surface Methodology (RSM) and the optimum machining condition is evaluated. The Central Composite Design (L20) is used to understand the behavior of responses with change in levels of machining parameters. The optimum machining parameters evaluated are temperature of etchant at 54.65oC, time of etching at 47.14 min. and concentration of etchant at 727.80 g/l. The confirmatory result shows the improvement in performance quality with setting of machining parameter at optimum level. The optimum machining parameters are used to manufacture the array of micro mould with size of 139 µm, 204 µm and depth of 15 µm, 13 µm used in different engineering and biomedical application. Keywords: PCM; Etching; Phototool; Undercut; MRR; RSM; Micro mould.