OBRABOTKA METALLOV

The problems of the cam mechanisms designing are discussed. The analysis of scientific literature on this problem indicates that today the synthesis of motion laws is usually performed without account of energy costs. The main criteria including phase angles and laws presented either in the analytic form or as tables of the cam profile are considered. The goal of the present study was to develop the method for synthesis of the motion laws of a cam mechanism with the account of energy costs from the payload, moment of inertia force, elastic forces of the mechanism elements and energy of the slave unit. This study is relevant due to the lack of uniform methodology taking into account energy costs during the mechanism design. A computational model of the slay mechanism of STB loom was used in the study. The values of work used to overcome resistance from the technological load, work from the mechanism inertia forces and energy used for elastic deformations of the mechanism elements were calculated to determine the energy costs of the mechanism. The mathematical package MathCad was used in the calculations. The analysis of the calculation results indicates that certain types of fabrics cannot be produced using existing parameters of the slay mechanism. A method for synthesis of cam mechanisms for technological machines including determination of energy costs from the payload, inertia forces and moment on the slave shaft of the cam mechanism was suggested on the basis of the performed studies. The theoretical studies were tested using a model of a particular machine – STB loom. The motion law of the slay mechanism was synthesized. A new profile of the cam in the form of the radius-vector table was suggested. The obtained results make it possible to discriminate assortment abilities of weaving machines by the values of the technological force and recommend their most efficient operation modes to factories

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