Preparation method of surface compound coating for guide rail of large measuring machine

Abstract

The invention discloses a preparation method of a surface compound coating for guide rail of large measuring machine. The method comprises the following steps: carrying out a pretreatment on the surface to be painted to ensure that the surface does not have any defect, eliminating the grease on the surface, painting the two ends of a guide rail and two fillets on two sides, covering the surfaces which are not to be painted and screw holes with press plates so as to protect the surfaces and the screw holes; carrying out a sand-spraying coursing treatment on the surface to be painted, controlling the coarseness so as to ensuring the combination performance between the coating and the matrix; preparing a composite coating on the surface to be painted of the guide rail through an ultrasonic flame spraying technology under the assistance of a mechanical hand automatic walking auxiliary mechanism, wherein the composite coating is composed of a Ni based alloy substrate layer and a Ni based self-melting alloy work layer; removing all protection press plates after the spraying, slowly cooling to the room temperature, blowing off the dusts and impurities on the surface of the guide rail by compressed air, and then evenly painting epoxy resin organic paint on the surface. The epoxy resin organic paint penetrates into the inner pores in the coating, and thus the compactness, corrosion resistant performance, and wear resistant performance of the coating are all improved. The guide rail surface compound coating prepared from the preparation method can satisfy the requirements of guide rail of large measuring machine.

Description

technical field [0001] The invention relates to a method for preparing a composite coating on the surface of a guide rail of a large measuring machine. Background technique [0002] Large-scale measuring machines measure the parameters of the measured objects through guide rail movement. Large-scale measuring machines, such as three-coordinate measuring machines, are currently the largest precision measurement systems and are widely used in aerospace, automotive, military, machine tool manufacturing, wind power, nuclear energy and other fields. , especially for precision measurement of oversized parts. At present, the common forms of measuring mechanism mainly include several structures such as mobile bridge type, fixed bridge type, column type, and gantry type. However, large-scale measuring machines have a large three-way stroke, and generally adopt a gantry type structure. Due to the large span of large-scale measuring machines, the stiffness, accuracy and reliability of...

AI Technical Summary

Problems solved by technology

[0003] Generally, the guide rails of large-scale measuring machines are welded with high-quality low-carbon thin steel plates, which are artificially aged to eliminate welding stress. Their corrosion resistance, surface condition and long-term reliability are poor, and they cannot meet the requirements of precision measurement; The Ni / Ti coating is sprayed on the wire rod, but the thickness of the coating is not uniform, resulting in a large amount of deformation of the guide rail, and the coating is prone to cracks and peeling during subsequent grinding, which seriously affects the measurement accuracy and reliability of large-scale measuring machines