﻿ 利用预应力原理提升龙门机床横梁的抗弯强度

# 利用预应力原理提升龙门机床横梁的抗弯强度Promoting the Bending Strength of the Beam of Gantry Machine Tool by the Principle of Prestress

Abstract: Beam is one of the important parts of gantry machine tool; compared with other parts, it bears the force and bending moment that is larger and has more complex direction. If a beam of its bending strength is insufficient, it will produce obvious deformation down and bring about the processing precision of gantry machining center with a great influence. In this paper, based on the principle of prestressing, the bending strength of the beam is promoted, the force model of the prestressed beam is established, the relationship between the deflection of the beam and the prestress is analyzed, and the finite element method is used to verify the prestressed beam. The results show that it is feasible to apply the principle of prestress to improve the bending resistance of beams, and the deflection reduced about 80%, increasing the machining precision of the gantry machine tool effectively.

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