Papers by Author: Min Kang

Abstract: The processing simulation method of numerical control electrochemical turning (NC-ECT) was presented based on the finite element method (FEM) in this paper. The three-dimensional analysis model of the electric field built in ANSYS software was solved. The current density distribution and the theoretical values of material removed depth per revolution (MRDPR) in different time on the anode were obtained. The experiments were carried out on the NC-ECT lathe, and the measured values of MRDPR were measured, which were compared with the theoretical values. It is indicated that the maximum percentage error between the theoretical values and the measured values is smaller and the simulation method meets the accuracy of the engineering calculations.

Abstract: In order to solve the problem of automation electric plating gear surface, the numerical control electric plating machining tool was developed based on open numerical control system. The relative movement and velocity of anode nozzle was controlled by the motion control model. The selection of working solution and the continuous feeding liquid were achieved by use of the digital I/O module. The technological parameters, such as working current, the temperature of plating solution, PH value, and so on, were collected by the module of analog quantity acquisition and stored in the computer. Based on the preliminary experiments, the machine tool was reliable higher and the distribution of plating thickness on the tooth profile surface was uniform. The automatic electric plating technology was realized on the tooth profile surface.

Abstract: To design the flow field of inner-spraying cathode in NC-ECT, the numerical model was built according to the physical model of the cathode flow channel, and the Computational Fluid Dynamics (CFD) method was applied to solve the numerical model. The velocity and pressure distributions were obtained. The influences of the cathode internal structure on the flow field were analyzed according to the numerical simulation. The relatively good simulation results were obtained by means of the optimization design of the cathode internal structure. Based on the experiment, the accuracy of simulation was verified, and the correction number of the flow field design was reduced in NC-ECT. It is indicated that the CFD method can be applied to guide the optimization design of the cathode structure.

Abstract: The high speed jet-electrodepositing equipment was used to prepare Ni-P alloy in substrate of 45 steel. The influences of current density on depositing rate, hardness of deposit and microstructure of Ni-P alloy were studied, and the comparation with that of conventional electroplating were studied. The results show that with the increase of stirring intensity of the electrolyte, the thickness of diffused layer decreases, the critical current density increases, and then the depositing rates increase to 69.82/min. A linear increasing of the depositing rate with the increase of current density is observed, and it refines grain size obviously. Deposit hardness up to 679HV.

Abstract: Structure, cotton harvesting principal and main working parameters of rubber-bar roller harvester were studied in this paper. K value of rubber-bar roller speed ratio was determined based on displacement and velocity equations of rubber-bar end established by work pattern of the roller. The functional relationship between K value and harvest angle β of cotton plant by rubber-bar was derived. Additional, t Additional, the effects of K value on angle β and cotton harvesting performance were analyzed. The experimental results showed that collect rate of cotton was above 95% and percentage of impurities was less than 18% when working speed was 3 km•h^-1 and K value ranged between 6.8～8.3.

Abstract: In order to measure the initial gap between the workpiece and tool-cathode in electrochemical machining, the measurement method based on machine vision was studied in this paper. First, the measurement system based on machine vision was established. The hardware of the system consisted of CCD camera, image data acquisition card, light source and computer. The software of the system was developed by VC++6.0. Then, the original digital image of electrochemical machining initial gap collected by the CCD camera system was changed into the contour of image through graying, bivalency, edge detection and segmentation. Through system calibration, the physical size of the gap was calculated. Finally, relative experiments were carried out. The experimental results validated the feasibility of the method which measures the electrochemical machining initial gap based on machine vision.

Abstract: Based on the characteristics of parameterized modeling technology, digital solid modeling of the parts of rubber-bar roller cotton harvester and virtual assembly of rubber-bar roller cotton-picking machine were established, The motion parameters curve of key parts were analyzed by dynamic simulating method. The results showed that cotton-picking machine could achieve high collect rate of cotton and low impurity rate at the 400-450 RPM and 0.83 m/s of working speed.

Abstract: To solve the difficulties in machining toric spectacle lens, the turning method with slow tool servo was discussed. First, the experimental setup was developed, which have X-axis, Z-axis and C-axis, and the movement of the three axes can be simultaneously controlled by numerical control system. Then, the mathematical model of toric was established, and its machining model was analyzed and simulated. Finally, the machining experiments were carried in the experimental setup. The experiments showed that the turning method based on slow tool servo can meet the requirements for machining the toric spectacle lens.

Abstract: In order to solve the difficulty in analyzing the shaping law of NC-ECM with ball-end cathode, the method of processing simulation was presented based on the finite element method (FEM). The two-dimensional analysis model of the electric field with ball-end cathode built in ANSYS software was solved. The current density distribution and surface shape in different time on the anode were obtained. The experiments based on the simulation parameters were carried out, and the dimensions of the processed surface were measured, which were compared with the theoretical values. It is indicated that the simulation method meets the accuracy of the engineering calculations. The method and theory for further in-depth research on the process simulation in NC-ECM with ball-end cathode are provided.

Abstract: To design the flow field of inner-spraying ball-end cathode in NC-ECM, the numerical model was bulit according to the physical model of the cathode flow channal, and the computational fluid dynamics (CFD) method was applied to slove the numerical model. The velocity and pressure distributations were obtained. The influences of the cathode internal structure and the outlet shape on the velocity of electrolyte were analyzed on the basis of the numerical simulation. The relatively good simulation results were obtained by means of the optimization design of the cathode. Based on the experiment results, the accuracy of simulation was verified, and the correction number of the design of the flow field was reduced in NC-ECM. It is indicated that the computational fluid dynamics (CFD) method can be applied to simulate the flow field, and the optimization design of the cathode can be guided according to the results of simulation.