Compensation of reaction forces in stationary machines
Research Task/Objectives
Whenever heavy loads need to be dynamically moved, reaction forces occur. When these forces lead to excitations of the machine frame process dynamics may be limited or the product quality decreases. Force compensation is one possibility to reduce reaction forces where they occur to prevent influences on the process. Masses that are accelerated contrarily to the process itself induce forces that compensate (partly) for the occurring process reaction forces.
Objective of the project is the development and construction of a linear hydraulic force compensation mechanism reducing the forces that are imposed by the clamping unit of an injection moulding machine.
Approach/Results
Based on an analysis of reaction forces occurring in an injection moulding machine prototype compensation strategies are developed. Information derived from analytical machine models is used to test and validate possible strategies for the reduction of reaction forces and machine excitement. A compensation drive is developed and built to test several compensation strategies at a prototype of a clamping unit. Results show challenges and potentials and facilitate the answer to whether or not the concept may be realized, considering the background of practice and economy.
Comparative study