The plastic-coated guides are often-used function parts on the NC machine tools, and the dynamic characteristic of its joint is of significance to the machining accuracy. The dynamic characteristic parameters of the plastic-coated guide’s joint are identified through modal experiments, then the law of various factors influenced on the parameters are analyzed. The results show that: increasing of the sliding speed will reduce the dynamic stiffness of the joint; increasing the surface pressure and adding lubrication oil will increase the joint’s stiffness; the plastic-coated guide can maintain the stability of dynamic characteristic better than the general metal guide, as the thickness increases of plastic-coat, the dynamic stiffness decreases but the damping increases, it is appropriate at 1.2 to 1.5mm for the plastic-coat in practice.
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