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Application Technology Study on Numerical Simulation Analysis of Electric Field in Electrochemical Gear Shaping Process Liu Liangke (Zhuzhou Vocational and Technical College Zhuzhou electric field numerical simulation method analyzes the current density and potential distribution on the tooth surface of electrochemical gears, in order to master the electrochemistry Gear shaping and cathode shape, structure and size design provide a useful idea. The key to electrochemical modification of gears is to design the cathode reasonably. Only by designing a suitable cathode can the optimality be ensured. The shape of the shape and the shape of the shape. We know that the shape, size and position of the electrode directly determine the distribution trend of the electric field lines. Therefore, it is necessary to study the electric field distribution law between the electrodes in order to obtain an appropriate electrochemical modification of the gear shape. When the machining parameters 2 are processed, the potential distribution of the gear surface is generally high. When the machining workpiece is immersed in the electrolyte, the various overpotentials can be ignored and the conductivity is considered to be uniform. Therefore, the current can be considered as current. The density distribution is a primary current distribution. The current density distribution on the surface of the electrode is the distribution of the electric field in the solution. Therefore, because the current density at any point is proportional to the potential gradient 59 at that point and the conductivity of the medium, ie, the homogeneous chemical reaction rate of the generated mass point B. Mass and charge transfer without considering polarization. The basic equations are: enterprise technology developed as anode metal volume electrochemical equivalent (mm3/Ah), i is current density (A/mm2) in constant current electrochemical modification, the minimum thickness of each tooth surface is removed. When a=1517=0.012rad, so as long as the amplitude increment is small enough, the calculation accuracy can meet the requirements. Therefore, the inter-tooth field can be simplified to the sector ring field as shown, U is the anode and cathode. The potential difference between the calculated fields is ABCDEFGH, where AB is the cathode surface, CD is the tip circle, GH is the root circle, DEFG is the tooth surface, E is the shape starting point, and F is the base circle and the tooth profile. Intersection point (base point), AH is the symmetry line between teeth, BC is the symmetry line of gear teeth. The boundary condition of the calculation field can be expressed as the calculation and analysis of 3.3 tooth surface current density. The basic formula of the tooth surface current density i= according to the difference operation Find the potential distribution between the teeth, which can be separately The current density component of a point on the tooth surface along the radial direction and the tangential direction of the circular mesh is obtained, and then a vector summation operation is performed to calculate the current density value at the point.
Radial current density 2" = 9 in.丨-9.丨-丨 Based on the above analysis and modeling, it is necessary to calculate the potential distribution and the tooth surface current density distribution in the electrochemical reaction region during electrochemical modification. The Fortran language can be used to compile the electrochemical gear shape. Electric field numerical calculation program.
Under different conditions of gear parameters (modulus, number of teeth, etc.) and machining parameters (interpole distance, machining voltage, etc.), the potential distribution and current density distribution at each point of the tooth machining area are calculated. The calculation results show that: When the ring cathode and the plate electrode are used to shape the gear, the potential gradient at the tooth tip of the tooth is the largest and the current density is also the largest; the tooth surface gradient from the tooth tip to the root gradually decreases, and the current density at the root is almost zero; The current density on the cathode is substantially evenly distributed.
Through calculation, the influence of various factors on the current distribution is as follows: (1) When the other parameters are constant, the gear modulus is small, the current density value on the tooth surface is higher overall; the gear modulus is large, and the current density is generally low; When the modulus increases to a certain value, the magnitude of the current density reduction becomes smaller and smaller, as shown. (2) The influence of the change in the number of teeth on the current density distribution is relatively small. (3) The smaller the distance between the poles, the larger the current density, and the greater the difference in current density between the tip and the root. (4) When other parameters are constant, the current density across the tooth surface increases proportionally with the increase of the potential difference. As shown in (5) when other conditions are constant, the conductivity of the solution increases, and the tooth surface current density becomes The effect of various factors on the development of the current sub-enterprise technology can be illustrated, but only two pictures are given in space.
Analysis of the tooth surface of the tooth direction revealed that the current density at the boundary was much larger than at other locations. Therefore, it can be proved that the design of the ring cathode and the plate electrode is reasonable. During the process of trimming, if the actual gear parameters change or the amount of trimming deviates from the trimming area, the processing parameters can be adjusted according to the relevant rules, and the cathode structure and size can be corrected and optimized to meet the actual processing. need. KmA/mm) 4 Conclusion Electrochemical machining is a very valuable special process. It has unique advantages in solving the difficult problem of hard and brittle material processing. It has the characteristics of practicality, high efficiency and economy. It is worthy of promotion in practical applications. The laplace equation for machining electric field in gear electrochemical modification is established. The boundary conditions are determined according to the actual machining method. The electric field distribution of the electrochemically modified tooth surface is numerically simulated, and the rationality of the cathode design is demonstrated. The influence of the analysis is analyzed. The current density distribution factor of the gear tooth surface provides a guiding basis for the realization of the process and the regulation of the parameters. â–¡
January 03, 2020