The Structure Analysis And Optimization Of Economical Engraving Machine

CNC machining technology has matured in recent years. Engraving machine is similar to a separate development of milling machine, which not only needs to ensure accuracy, efficiency, stability during the maching process, but also needs taking the artistic design into consideration. Engraving machine are widely applied in advertising, printing, decorative jewelry products and many other industries. There have been many engraving machine manufacturing companies both domestic and abroad, but the prices for small and medium engraving machine are generally high. Under that circumstances a kind of engraving machine which can satisfy the machining performance and have low price are broadly needed.The paper studies on a kind of economical engraving machine. First, two engraving machine’s structure were designed according to the motion distribution. Second, two engraving machine’s overall structure are made static and dynamic characteristics analysis by using ANSYS software. The gantry structure of engraving machine was selected according to the simulation results. Third, some important structural parameters were optimized in order to improve the accuracy and stability during machining process. Then the kinematics of engraving machine was simulated by using ADAMS software. Finally engraving machine kinematics simulation results were tested and verified by experimental equipment which verified the reliability of economical engraving machine. Specific research contents and conclusions were as follows:(1)According to the comparison of different motion distribution, the overall layout of gantry and mobile worktable engraving machine’s structure were designed. Main dimensions and kinematic and dynamic parameters of engraving machine were identified initially. Then the main and feed transmission structure layouts of two kinds of engraving machine were designed. And also different supporting parts of electric spindle were designed. Finally two kinds of engraving machine’s structure were refined and 3D models of engraving machine were built by using Pro/E software.(2) Accroding to the static analysis results of gantry and mobile worktable of engraving machine’s structure, both engraving machine’s structure deformation were less than 0.1mm; two structure’s maximum equivalent stress positions were at the connection of Y and Z Axle’s supporting parts. According to results of the free modal and working modal, both structures avoided the electric spindle working frequency to prevent from resonance. From the deformation map, both structure’s major deformation positions were at the post supporting structure but the mobile worktable of engraving machine’s structure also had large deformation. The gantry structure of engraving machine was decided to be used after the comparison of the static and dynamic characteristics analysis of two structures.(3) According to the static and dynamic characteristics analysis results of two structures, some main structural parameters were optimized. Height(H) of gantry supporting parts, width of Y Axle rail, length(L) and thickness(D) of electric spindle supporting parts were studied the impact of structure’s the static and dynamic characteristics. The main structural parameters after the optimization of engraving machine were as follows:height(H) of gantry supporting parts was 250mm, width of Y Axle rail was 280mm, length(L) of electric spindle supporting parts was 130mm and thickness(D) of electric spindle supporting parts was 60mm.(4) Kinematics of engraving machine’s structure was simulated by using ADAMS software. The result of kinematics simulation showed that each axial displacement were fluctuated by the cutting force and the high speed rotation of electric spindle. Each axial displacement were small that could satisfy the machining requirements from the axial curves of displacement. Machining experiment on kinematics simulation was done by using engraving machine. The experiment verified the cutter path of kinematics simulation and also the engraving machine’s reliability in this paper.