Structural Design And Dynamic Property Ansysis Of The Electroplated CBN Grinding Wheel Matrix

With the improvement of mechanical processing technology level, the electroplated CBN grinding wheel is more and more applying in narrow-deep slot by creep feed grinding. The foreign technology of electroplated CBN grinding wheel is relatively mature, but in our country, this technology is not perfect. The electroplated CBN grinding wheel which is applied in the grinding of narrow-deep slot with hard and brittle and difficult-to-machine materials is largely depend on abroad. Therefore, the urgent problem is to create the electroplated CBN grinding wheel which can be used in the grinding of narrow-deep slot with difficult-to-machine materials. This study is proposed based on this background.This paper presented the preliminary design scheme of the two electroplated CBN grinding wheel matrix. Then analyzed the design of two wheels by the finite element modal analysis and harmonic response analysis, and the final design of the matrix is determined. After researched the stress distribution of the determined design of the matrix to improve the matrix structure, and the improved dynamic characteristics of the structure. Finally, the single grit of grinding simulation was done in ANSYS/LS-DYNA. This paper studies the following aspects:1)According to the machining accuracy of the narrow-deep slot design the structural of the grinding wheel matrix to meet the narrow-deep slot processing requirements'matrix structure by select the matrix'materials, and determine cross-sectional shape and size of the matrix. And then design processing technology and assembly methods.2)According to the design scheme of two wheel matrixs, calculate the two wheel matrixs'mode shapes and natural frequency of its vibration mode analysis by do modal analysis after model wheel matrix in ANSYS. Through the modal analysis obtained vibration transmission of wheel matrix at different frequencies. Later, simulated the grinding force of process and conduct the harmonic response analysis for the two schemes in ANSYS, and calculated the response curve of amplitude-frequency using the modal superposition method. According to the maximum response of grinding wheel under the exciting force to determine the design scheme of matrix which most appropriate for high-precision narrow-deep slot grinding.3)Through the stress distribution curve to determine the site of grinding wheel matrix that may be damaged after stress analysis of the optimal design wheel matrix is done. Then make the stress distribution tends to be reasonable by structural improvement of the matrix. Finally, do dynamic characteristics of the improved wheel matrix, so that the new dynamic characteristics still meet the processing requirements.4)The chip formation process and the grinding stress are simulated by a single abrasive particle in the ANSYS/LS-DYNA.Give the grinding stress curve at last.According to the machining accuracy requirements of the narrow-deep slot, obtained the conclusion that the tapered electroplated CBN grinding wheel is the best narrow-deep slot for grinding by the dynamic characteristics analysis of the two CBN grinding wheel matrix'. This is great significance for CBN grinding wheel matrix design of the narrow-deep slot processing.