Papers by Author: Li Min Shi

Abstract: In order to study the complex groove inserts in the cutting process caused by temperature variation of cutting,Using multi factor cutting method and combined with finite element simulation technology, from cutting parameters and chip-breaking groove two aspects influence on cutting temperature and cutting force cutting tests were carried out and experimental study on the complex groove turning insert edge chamfering, rounded cutting edge radius on cutting temperature effects. Also tested the effects of temperature on the chip shape cutting and breaking, and analyzed the temperature on the Influence law of cutting tool wear, thus providing a theoretical basis for tool wear.

Abstract: Titanium alloy Ti6Al4V has poor machinability, which leads to high unit cutting force and cutting temperature, rapid tool failure. In this study, the effect of the cutting speed, feed rate and cooling condition on cutting force and cutting temperature is critically analysed by turning experiment. At the same time, the relationship is established among tool wear, cutting force and cutting temperature. This investigation has shown that cutting speed is the decisive factor which increasing cutting force and cutting temperature. In the process of turning, tool wear results in high amounts of heat and mechanical stress, which leads to serious tool wear. The Minimal Quantity Lubrication reduces the frictional condition at the chip-tool, decreases cutting force and cutting temperature, and delays the tool failure.

Abstract: In the paper, a new polishing head is researched and developed. How to set a magnetic feild is a key factor in magnetic-electrochemical compound polishing. To add a magnetic field that is parallel to electrical field, the electrochemical reaction can be changed greatly. Additionally, to add a magnetic field whose direction is changed to and fro, the efficiency of the polishing can be improved especially. In order to adapt to this theory, a new polishing head in magnec-electrochemical compound polishing is required resarch and development. Furthermore,the tool can be fixed on spindle of CNC easily and the tool is flexible so it can make the polishing head and workpiece touch evenly each other. Especially being noticed, the head of magnetic-electrochemical compound polishing tool is a series in order that the head can be replaced conveniently according to different surface. At last, the tool is tested and its function is perfect.

Abstract: A new polishing head is studied in magnetic-electrochemical compound polishing in the paper. Added a magnetic field whose direction is parrallel to the electrical field’s directions, the charged partcles between two electrodes can move in spirals in magnetic-electrochemical compound polishing, and then the condition of chemical reaction is improved. If the direction of magnetic field is changed alternative, the effect of polishing can be improved more clearly. The tool can be fixed on spindle of CNC easily. The tool is flexible, so it can make the polishing head and workpiece touch evenly each other. Because the head of magnetic-electrochemical compoud polishing tool is a series, the head can be replaced conveniently according to different surface. Particularly,the tool can change strength of the magnetic field easily. At last, the tool is tested and its function is perfect.

Abstract: Traditionally, the magnetic field is always vertical to the electrical field in a magnetic-electrochemical compound polishing.The magnetic field is set to parallel the electrical field in this paper. The mathematical model of the charged particles movement in a magnetic field is established through the analysis of its movement process when using Coulomb laws and Lorentz force. Through constructing the velocity formulation and loci formulation, the function of the magnetic field is proved. Because of the magnetic field, the concentration polarization of electrochemical reaction can be reduced more and the electrochemical reaction can be accelerated easily than the traditional polishing in which the magnetic field is vertical to the electrical field. Finally, to verify the model, the magnetic-electrochemical compound polishing process has been tested and the results, compared with those obtained from the model, have shown the movement model is reasonable and the analysis to function of magnetic field is correct.

Abstract: Magnetic-electrochemical compound polishing is applied in difficult-to-process materials little by little. The influence of the magnetic field to electrochemical process is very complicated. In the paper, using Coulomb laws and Lorentz force, the two kinds of math model of the movement of the charged particles are established according to the different magnetic field whose direction is vertical or parallel to the electrical field. The velocity equations and loci equations of three typical particles are concluded in two kinds of magnetic field’s directions. To be compared and analyzed carefully, the influence of the magnetic field’s direction to polishing is concluded. This study can guide how to determine the magnetic field’s direction in magnetic-electrochemical compound polishing, and build the theoretical basis to study the mechanism of magnetic-electrochemical compound polishing.

Abstract: With widely using difficult-to-process materials, such as the stainless steel and SnSb alloy, the magnetic-electrochemical compound polishing process has been paid much more attention by some Japanese and Chinese researchers. In the paper, the math model of the movement of the charged particles in a magnetic field is established through the analysis of its movement process, using Coulomb laws and Lorentz force. The velocity equations and loci equations are concluded, and the movements of there typical particles are compared carefully and analyzed. Therefore, the function of the magnetic field is drawn. In the end, to verify the model, the magnetic- electrochemical compound polishing process were tested and the results were compared with those obtained from the model, the results showed the movement model was reasonable and the analyzing to function of magnetic field was correct.