Considerations on the Improvement of the Stiffness of Bolted Joints in Machine Tools

概要

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The present paper deals with a method to improve the stiffness of bolted joints in machine tools. In the reasonable design of bolted joints, the stiffness, the bolt axial force and the distribution of contact stresses are important characteristics to be considered, and they have been investigated by many researchers. But effects of the tightening position of screw thread in a base, the thickness of clamped parts and the configuration of contact surfaces are not taken into consideration sufficiently. Thus, in the present paper, the effects of the tightening position of screw thread in the base on the stiffness and the distribution of contact stresses are examined experimentally in the case where a beam is fastened partially to the base with tap bolts. As a result, it is shown that these effects contribute to the improvement of the stiffness of bolted joints.
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