Research On The Application Of Dynamic Property Analysis And Design For Machine Structure

Recently, the NC machine tool has been used widely for the manufacturing'sprospering. The proportion of NC machine in enterprise increased greatly, even inindividual enterprise. Although there has been an improvement in NC machinemanufacturing techniques, the most important problem is still lacking for high-levelNC machine;the requirement for large-scale and high-precision machine can not besatisfied. To improve the precision and speed of machine manufacturing, a good static& dynamic property for NC machine's structure is necessary. In this dissertation, themethods for machine structure analyzing and designing is studied according to thetheory of mechanical structure analysis and design, which involves several designinstances.Main content is listed as following:1. The modification for structure of slide, component part of a mold machiningcenter is taken as example to study the analyzing and designing methods formachine structure. The variable analyzing method with Ansys software is applied.According to the analysis result, several modification schemes were provided.2. The experiments on grinder for groove of bearing outer ring were conducted toidentify the cause which induce visible wave on the surface of bearing, theworkpiece of grinder. The waviness on the surface of bearing was measured, thevibration experiment and impact modal experiment on grinder was conducted.Through studying experiment data, a inference was drawn that visible wavinesson the bearing is due to the forced vibration of grinding wheel spindle.3. The characteristic of grinder structure being taken into account, some suggestionswere brought forward aiming at the problem of grinder. An equilibrant device wasdesigned on the grinding wheel shaft. The rotation of grinding wheel spindle withequilibrant device was simulated with MSC Visual Nastran 4D software.4. The vibration experiment on finishing lapping machine when dry running andimpact modal experiment were conducted to analyze the property of four-barlinkage structure, which brings foundations for latter design of structure.