JPS60102222A - Ceramic thermal spray roll for cold rolling process - Google Patents

Abstract

PURPOSE:To improve pickup resistance by limiting the range of coarseness and forming the tip of minute projections round. CONSTITUTION:After forming a ceramic thermal spray film on the surface of a metallic roll by gas explosion thermal spray process or plasma thermal spray process, the roll is passed through processes of polishing and shot blasting, and coarseness of roll surface is adjusted. In the surface profile at this stage, projections are sharp and can not be used as roll for cold rolling parocess as there is a problem of pickup. From this condition, the tip of projections is formed round by abrasive made of resin, and average coarseness is adjusted to the range of 1.0-2.5mum.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic spray roll that is used in a cold rolling process and has excellent pick amp resistance.

Conventionally, Sendzimir mills' Teflex rolls for stainless steel have been used with Cr plating on the surface of the metal roll, but due to the relationship between the adhesive strength and surface hardness between the coating and -IJJ material, plating peeling and roll scratches may occur. , wear occurs, and the roll life varies from one week to six months, with an average life of four months.

Recent technology has advanced into the field of ceramic coating or Cr coating for the purpose of improving bond strength and wear resistance t1. However, in the Kanba process, when ceramic 910-ru is applied instead of Cr metal 7-kilo, the problem of pink amplifier occurs. In particular, it was not possible to apply Ceraminku Solu 40-L to Teflextrol of Senshimia Mill for stainless steel because it did not affect the quality of the pink amplifier or strip.

The reason is as follows. The surface of the roll needs to have a roughness of +a to prevent the strip from slipping. This roughness formation process is similar to that in the case of coating, in which the roughness of the roll surface is adjusted by shot fracturing, and then the final plating film is formed.
In case 4, after forming the sprayed coating, the roughness is adjusted using Nyontoplast. Therefore, in the latter case, the tips of the protrusions that form the surface roughness become sharp, and fine metals and foreign matter are deposited on the slip, resulting in a so-called pick amplifier.

So, the uninventiveness is ceramic, MrA40-ru's L defect?
The purpose of the above machine is to reduce the life span of rolls for the rolling process by 1Δ, with the advantages of high wear resistance and adhesive strength. In order to eliminate the pink amplifier that occurs on the surface, the aim is to limit the 711 degree range and mold the tip of the microprotrusion into a round shape to improve the resistance to pimples, quakes, and pimples. do.

The gist of the present invention is to round off the tips of microprojections forming surface roughness in a ceramic thermal spray roll used in the cold rolling process.
It is molded evenly and has a surface roughness of 10 to 2.5 g.
There is a ceramic spray roll for cold rolling process, characterized by having m.

The present invention will be explained in detail below with reference to figure u'+i. No. 111. Figure 2 shows a 1fl enlarged view of a portion of the surface of the solvent roll.
The i-plane profile is schematically reduced. 1 is a microprotrusion, 2 is a sharp tip thereof, and 3 is a round and smoothly formed tip of the protrusion. Figure 1 shows the stage at which the thermal spray roll surface is sicosotoplasted, where the microprotrusions 1 have warts with sharp tips 2, and the second
The figure shows a prop at the stage where the tips of microprotrusions 1 with a set j ratio of 11 are rounded and subjected to force. It is le.

To explain the production of the ceramic thermal spray roll according to the present invention, the ceramic is coated on the surface of the metal roll using the dregs explosion thermal spraying method or the plasma blasting process by 47 people. After forming one film of ri, the roughness of the roll surface is adjusted after polishing and blasting. Table II at this stage
The '11 profile has a protrusion or sharpness as shown in the Th++ s diagram, and is pink for a cold rolled process roll.

IJT is not used because it becomes a problem. The roll of the present invention can be obtained by further molding the tips of the protrusions firmly using a resin abrasive and finishing the roll with a profile as shown in Fig. 2.
The construction work was carefully arranged to ensure the safety of the people.

The reason for limiting the roughness is that if the average roughness is less than 10 m, the long-term opening of the roll is required, and the roughness is 41 1&Ra or 2.5. If it is larger than Lm, the sum of the rolls is 1.
・I wonder if there will be a problem with transfer to the lips.

Next, a more specific embodiment of the present invention will be described.

In the deflector roll for Senshimia Mill for stainless steel, a powder made by twisting 87% tungsten carbide (WC) and 13% cobalt (Co) is formed on the surface of the 4A quality SUJ metal roll using the scum explosion spraying method to form a coating approximately 150 μm thick. After that, the surface of the coating was polished to a surface roughness of about 3S. After that, average roughness Ra = 3 by John de blasting
．． 5 gm, and further rounded the tips of the micro protrusions using a resin abrasive material with a 1-mesh structure, and the average roughness Ra
was delivered to 1.5 meters.

The surface profile of this ceramic melting roll is shown in FIG. Compared to the surface profile of the conventional thermal spray roll shown in FIG. 4, there is a difference in the shape of the protrusions, and due to this difference, the inventive roll has an excellent effect on pick amp resistance.

According to the present invention, the differential of Senshimia mill for stainless steel/
We were able to extend the lifespan of the rolls by more than four times compared to conventional rolls.

[Brief explanation of drawings]

2'S I L4 is a schematic diagram of the surface profile after shore blasting of ceramic and solvent rolls; Figure 23 is a schematic diagram of the surface profile of finished felling; The surface profile of the thermal spray roll, Figure 4 is the table of the Ichigo thermal spray roll (r11 profile). 1...Minute protrusions 2...Sharp tip 3...Round and smoothly formed tip Kawasaki Steel Corporation Coordination fee, person 'j1', land, Ikio Kosugi Figure 1 Figure 2 100F - Heavy Figure 4

Claims (1)

[Claims] 1 Tips of minute protrusions that form surface roughness in the ceramic spray roll used in the cold rolling process ☆;1. Form the i part into a round and smooth shape, and make the surface + Gi side melon from 1.0 to
A ceramic welding roll for cold rolling process characterized by having a length of 2.5 km.