Abstract
The natural modes and frequencies of a C-type press machine are analyzed by the component mode synthesis method. The total structure of this press machine is divided into 32 components. The natural modes of each component are calculated individually by the finite element method. The degrees of freedom of the components are reduced by the local modal coordinates. The equations of motion of all components are combined to compose the total equation of motion. The natural modes and frequencies of the total structure are obtained by the eigenvalue analysis. The impact force at the moment of actual punching of a steel plate is measured. The dynamic response of this press machine at punching is calculated under the input condition of this measured data of the impact force. The calculated result of the lateral displacement between the punch and the die agrees well with the measured result in actual punching tests. The optimum design is performed by the sensitivity analysis in order to minimize this lateral displacement under the given condition of design. As a result, the maximum value of the lateral displacement between the punch and the die decreases to 40 percent of that of the usual machine.
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