High-speed presses for failure to balance the inertial force under the Institutional Analysis

    Determination of high-speed punch agency inertial force, there are two: general mechanics methods and quality substitution method. High-speed presses determine member inertia force using the first method, the demand for a member of the center of mass acceleration and angular velocity, we are quite cumbersome when different positions speed presses agencies stress analysis, to simplify the calculation, it is contemplated that the quality of the member by a certain conditional distribution in a few selected points member, use these imaginary instead concentrated mass component quality, it is not only the needs of a centralized mass inertia force, without the requirement of inertia moment of couple. Thus simplifying the calculation. High-speed presses to enable members before and after the substitution inertial forces and moments of inertia couple remains unchanged, the following three conditions should be met:
     
        (1) The mass member before and after the substitution of the same;
    ;    (2) substitution centroid position before and after the member of the same;
        (3) substitution of confrontation around the mandrel member inertia unchanged.
     
        High-speed presses engineering, in order to facilitate the calculation, and often they use static substitution that is, only to meet the first two conditions, although the substitution couple before and after the moment of inertia member will produce an error, but this error is the ability to project acceptance.