FI73024C - HAORD YTBELAEGGNING FOER PAPPERSMASKINER. - Google Patents

Description

The seams of the parts of the 3 73024, which are tightly and non-removably placed on the rigid support structure, are slightly slanted, carefully polished and joined tightly together so as to create an absolute recess of at least 1 μm. The edges of the jointed oxy-ceramic elements are chamfered in a region in contact with the wire and have a surface roughness value of at most 0.8. In order to increase the lubricating effect, the surface of the hard coating is made of a hard raw material, in particular an oxide ceramic material, the coating end forming an obtuse angle with the surface of the coating in contact with the wire, so that a water wedge is formed by the wedge and vortex. on a thinly decreasing liquid film from the surface of the coating. To enhance this effect, the roughness of the hard coating inlet surface is greater than the average roughness value of the surface in sliding contact with the wire.

The invention is characterized by the features mentioned in the characterizing part of claim 1. In the following, the invention and the advantages obtained by it will be described with reference to the figures of the accompanying drawing, in which Figure 1 shows the coating seen from above; the direction of travel of the wire is indicated by an arrow and the relatively rougher zones vary with the less rough zones.

Figure 2 shows examples of different construction possibilities in which the zones have different surface roughness. In any case, the examples presented do not present all the structural possibilities.

Figure 3 shows a cross-section of the Compound coating. The parts 401, 402, 403, 404 are tightly sealed oxide-ceramic plates in sliding contact with the wire, 405 is a common support structure body to which the ceramic plates are fixedly connected, reference numerals 406, 407, 408 denote the areas of the oxide-ceramic plates is in sliding contact with the wire, and has an absolute depth of the grooves of at least 1 μm and a surface roughness Ra of 0.8 μm or less.

Figure 4 shows the area of the hard surface inlet surface in sliding contact with the wire.

The part indicated by reference numeral 409 is e.g. 415 is the top surface of the coating, 416 is the direction of travel of the wire.

Coatings made in this way not only have a longer service life, but also increase the service life of the wires.

Claims (3)

5,73024 1. A hard coating, in particular for busts, thoracic backs, deflectors, foils, support tables, wet suction boxes, level vacuum cleaners, hole suction boxes, tube vacuum cleaners and felt stimuli, is made of compounding , the surface in sliding contact with the wire being at least partially of a hard material, the hard materials being fixedly and non-releasably connected to a rigid, non-rotating support using mechanical and / or chemical-physical aids, and the area of the wire sliding in contact with the wire roughness value of less than 1,0 μm, characterized in that the surface of the oxide-ceramic elements has areas of varying roughness such that smooth areas with a Ra value between 0,3 and 0,5 yarn or even equal to or less than 0,2 yum, v fluctuate with relatively rougher areas. Hard coating according to Claim 1, characterized in that the areas whose roughness differ from one another vary in the direction of travel of the wire. Hard coating according to Claim 1 or 2, characterized in that the areas with a higher roughness are provided with grooves which form an acute angle with the direction of travel of the wire and whose tips are ground and therefore blunt.