A method for manufacturing a high-density tungsten carbide coated roller for a solvent-free composite machine

Abstract

The invention provides a manufacturing method of a high-density tungsten carbide coating roll for a solvent-free compound machine. Aiming at meeting the requirements for high wear resistance, low porosity and low friction coefficient of a coating roll for the solvent-free compound machine, a method for adding 5%-50% by weight of spherical WC particles with particle size being 30-100 mu m to spraying powder of sintered or agglomerated Ni-based WC, Co-based WC or Co-Cr-based WC and the like is adopted, high-speed spherical WC particles rebound instead of depositing in a coating during spraying,under the beating action after rebounding, the coating is more dense and low in porosity, coating glue is not prone to sticking and is easy to clean during using, and transfer rate is high; meanwhile,binding force between particles in the coating is increased under the action of repeated beating of the spherical WC particles, the particles are not prone to stripping during high-speed wearing, wear resistance is improved, and service life of the roll is prolonged. Porosity of a metering roll, a glue transfer roll and the coating roll, manufactured with the method, of the solvent-free compoundmachine is lower than 0.4%, surface smoothness is high, Ra is smaller than 0.08 mu m, wear resistance and transfer rate are high, and the service life is prolonged by 5 times or more.

Description

technical field [0001] The invention relates to a method for manufacturing a high-density tungsten carbide coating roller for a solvent-free composite machine, in particular to a method for manufacturing a high-density tungsten carbide coating for a metering roller, a rubber transfer roller, and a rubber coating roller of a solvent-free composite machine coating mechanism. Method of supersonic flame spraying. Background technique [0002] At present, the three most important environmental protection technologies for international flexible packaging are: solvent-free lamination technology, flexographic printing and co-extrusion lamination, among which solvent-free lamination technology is the most environmentally friendly. At present, solvent-free lamination technology has occupied a very important position in the European and American markets, accounting for 80% to 90% of new lamination equipment. In my country, solvent-free composite technology began in the middle and late...

AI Technical Summary

Problems solved by technology

Electroplated chromium is relatively dense, with small porosity, less glue, surface finish Ra0.02μm, but not wear-resistant; chromium oxide coating is more wear-resistant than electroplated chrome, but the porosity is generally 2-3%, and the amount of glue is large. Residual glue remains in the pores, which is difficult to clean. Residual glue will cause unevenness and high points on the roller surface. When the compounding speed is fast, it will cause changes in the amount of glue applied and coating uniformity. Blanks will cause white spots and air bubbles, which will reduce product quality. , especially when compounding aluminum foil, the concave and convex high points cause the surface of the aluminum foil to be uneven, the pinhole size is large, and the number increases, which reduces the barrier performance of the aluminum foil and cannot meet the use requirements

[0005] Tungsten carbide coating has the characteristics of low porosity (1100Hv), but conventional supersonic flame spraying still has a porosity of 0.7-1%, and the combination of particles and particles during high-speed operation Insufficient force will also cause wear and tear, which cannot meet the requirements of the coating mechanism of the solvent-free compound machine