To secure the precision forming capability of a press while reducing its production and transport costs, the development of stiff and lightweight frame is important. In this study, the topology and multi-objective structural optimization problem of a frame structure was introduced with an effort to develop highly stiff and lightweight frame for a mechanical press with 300 ton capacity. First, a design space model was constructed to derive a new frame structure different from the existing one for topology optimization. Using the design of experiments and the structural analysis model of the frame structure improved based on the topology optimization result, the multi-objective optimization problem was established with loop stiffness and mass of frame as objectives and the steel plate thickness as design variable. The review on Pareto optimum solutions of the multi-objective optimization problem revealed the fact that this optimization method could significantly contribute to the high stiffness and lightweight frame structure for a mechanical press.

This paper describes the design of the force measuring system for an industrial robot’s deburring work. The force measuring system is composed of a three-axis force sensor, a measuring device, a housing and a cover. The three-axis force sensor can detect x-direction force, y-direction force and z-direction force at the same time. The measuring device is designed using DSP(Digital Signal Processor), and have a RS-232 and a RS-485 communication port for sending force data to PC or other controller. As a result of test, the repeatability error and the non-lineality error of the three-axis force sensor are less than 0.03%, and the interference error of the sensor is less than 0.95%. It is thought that the force measuring system can be used for an industrial robot’s deburring work.