A method for enhancing the surface of metal rolls by electrospark deposition combined with plasma cladding

Abstract

The invention relates to a method for strengthening a surface of a metal roller by adopting an electro-spark deposition method and a plasma fusion covering method. The metal roller is processed in an electro-spark deposition way and a plasma fusion covering way, so that the problems for improving the hardness, abrasion resistance and impact resistance of the surface of the roller and prolonging the service life of the metal roller can be effectively solved. The method comprises the following steps: performing fusion covering of alloy powder onto the surface of the roller by utilizing non-oxidized plasma beam to form a molten alloy coating, depositing WC ceramic hard alloy by utilizing the electro-spark deposition way on the basis of the plasma fusion covering coating to form a composite coating integrating the electro-spark deposition and plasma fusion covering. The method is simple and practical, the electro-spark deposition and the plasma fusion covering composite coating is firmly combined with a substrate, the thickness of the coating is large, so that the surface hardness, compactness, heat resistance and abrasion resistance of the roller are good, and the service life is long; by adopting the composite coating, the price of the iron-nickel alloy powder is low, the thickness of the coating is large, the abrasion resistance and corrosion resistance are good, the hardness and strength are high, and the abrasion and heat resistance is excellent.

Description

technical field [0001] The present invention relates to a metal roll, in particular to a method for enhancing the surface of a metal roll by electric spark deposition combined with plasma cladding. Background technique [0002] In the metallurgical steel industry, as my country has become the largest manufacturing country in the world, and steel rolling is an important field in steel production, rolls are an important tool for steel mills to roll steel plates (steel strips) or steel bars, and they are also an important tool for rolling steel. One of the main consumable spare parts in production. The working conditions of the roll are generally very harsh. It has to withstand very complex alternating loads and impacts, as well as the working conditions of rapid cooling and rapid heating. In addition to sufficient strength and toughness, it is also required to have high wear resistance and resistance. Thermal and impact resistance. Therefore, improving the hardness of the rol...

AI Technical Summary

Problems solved by technology

The laser surface quenching hardening layer has large equipment investment and high maintenance costs; surface intermediate frequency quenching, resistance furnace overall heating quenching, and differential temperature quenching methods are suitable for carbon structural steel and alloy structural steel, but the quenching hardening layer has poor heat resistance and cannot be used Hot rolling; the cost of surface surfacing wear-resistant materials is high, and there is also the problem of difficult surface processing; surface thermal spraying pretreatment generally adopts sandblasting, which has environmental pollution, difficult coating processing, poor bonding between coating and substrate, and easy coating Fatigue spalling; the large lasers required for laser cladding alloy layers are expensive, and there are many defects at the lap joints of laser cladding beams, and post-processing of cladding layers is also difficult

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