Error Prediction in Industrial Robot Machining: Optimization Based on Stiffness and Accuracy Limit

Among the advantages of using industrial robots for machining applications instead of machine tools are flexibility, cost effectiveness, and versatility. Due to the kinematics of the articulated robot, the system behaviour is quite different compared with machine tools. Two major questions arise in implementing robots in machining tasks: one is the robot’s stiffness, and the second is the achievable machined part accuracy, which varies mainly due to the huge variety of robot models. This paper proposes error prediction model in the application of industrial robot for machining tasks, based on stiffness and accuracy limits. The research work includes experimental and theoretical parts. Advanced machining and inspection tools were applied, as well as a theoretical model of the robot structure and stiffness based on the form-shaping function approach. The robot machining performances, from the workpiece accuracy point of view were predicted.

Robot Performs 1st Surgery in U.S.

周三,一位美国妇女由刚刚获得批准的达芬奇外科手术系统实施了第一例胆囊切除术。周二由美国食品和药物管理局批准在美国5家医院使用的达芬奇外科手术系统,能使外科医生用电脑终端熟练地控制操纵杆进行手术。外科医生通过植入病人体内的数个透镜能看到病人体内的三维图像。