RU1793977C - Method of strengthening metallic surfaces - Google Patents

Abstract

Usage: improving the stability of processing and improving the quality of the surface of the rolling rolls during their operation. The surface of the roll is treated with a rotating elastic brush interacting with aluminum material. The surface of the roll is subjected to processing in an area with a temperature of 100-200 ° C during their operation. 1 ill., 1 tab.

Description

ate

WITH

The invention relates to the field of metal working, namely, hardening of products by surface plastic deformation with simultaneous coating of plastic materials and can be used to restore worn parts, rolling rolls, etc.

A known method of surface treatment of rolled oalks during the rolling process, according to which the roll after leaving the deformation zone is subjected to fastening by striking 1. However, this method does not provide a riveted layer on the rolls of ductile iron.

Closest to the claimed method is a method of surface treatment of rolling rolls, according to which the roll is treated with a rotating elastic brush interacting in front of the zone

surface treatment with aluminum material 2.

The disadvantage of this method is the instability of processing, and therefore the low quality of the resulting surface of the rolling rolls, which affects their operation.

The purpose of the invention is to improve the quality of the treated surface and increase the stability of the method.

The goal is achieved in that in the method of hardening a metal surface, including its processing by a rotating elastic brush, interacting in front of the surface treatment area with aluminum material, the treatment is subjected to a zone with a surface temperature of 100-200 ° C.

The essence of the method lies in the fact that the aluminum coating is applied to a metal surface, in which quality

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Yu VJ VJ

with

The gauge of the rolling roll was taken during the entire rolling cycle, with aluminum being applied to the surface of the stick, which had just emerged from the deformation zone and was warmed to a temperature of 100-200 ° C. In this process, the coating of aluminum was stable. The coating is obtained in good quality - no peeling and pores. With further rotation of the roll, the applied coating again enters the deformation zone, instantly heats up, oxidizes and diffuses into the surface layer of the roll, forming intermetallic compounds that significantly increase the hardness of the applied coating. Thus, during the rolling process, the istiranme of the coating occurs, its deposition again, hardening of the surface layer due to hardening of the surface layer with a metal brush, and diffusion metallization with aluminum.

The invention is illustrated in the drawing, which shows a diagram of the implementation of a method of hardening a metal surface (in particular a rolling roll).

The roller 1 is hardened by treating it with an elastic brush 2, which simultaneously hardens (rivets) the surface and applies an aluminum coating. Number 3 is metal. The brush is installed on the side of the metal exit from the deformation zone, in the area where its surface temperature becomes equal to 100-200 ° C.

In the process of rolling metal in rolls 1,4, the latter are heated. From the rotation of the elastic brush, the aluminum ingot 5 heats up, as a result of which the aluminum flows and covers the roll 1.

In order to achieve the stability of the method, the tension n is set, i.e. the distance between the axes of the brush 2 and the caliber of the roll 1 is kept constant. To do this, install the mechanism b creating the tension d. The brush 2 is provided with a drive 7. The width of the brush is equal to the width of the rolled metal.

Example. Rolling with simultaneous hardening of the metal surface (roll) was carried out at mill 300 No. 2 of the Magnitogorsk Iron and Steel Works. Produced

Claims (1)

SUMMARY OF THE INVENTION A method of hardening a metal surface of predominantly rolling rolls, comprising treating it with a rotating elastic brush that interacts in front of the surface treatment area with alumina rolling strips of 75x4 mm in size from steel grades StZps, StZsp, VZps and VZsp. A thorough coating was applied to the calibers of a cast iron roll of the SPKhN-50 design, with a barrel hardness of 50 units. on Shore and with a working diameter of 414 mm. For the estimated indicator of the wear resistance of the roll, the wear rate of the caliber was taken, which was determined as follows: .. A IN where A is the total caliber production area, microns (experimentally determined by constructing a caliber profilogram before rolling and after); N is the number of cycles (revolutions) performed by the roll when rolling a given amount of metal, vol. For the reference indicator adopted the intensity of wear of the metal surface of the prototype. Moreover, the caliber production area was 9.68 × 106 μmX. The number of cycles performed by the roll was 53231 revolutions, the wear rate was And 179 μm2 / rev. Next, a rolling process was carried out with simultaneous coating of the working gauge, the brush being brought to the roll at points having different surface temperatures. The number of cycles performed by the roller was recorded, the total caliber production area was measured, and the wear rate was calculated. The experimental results are given. in the table. As can be seen from the above data, the wear rate of the metal surface is significantly reduced when applying a coating in the temperature zone surface 100-200 ° C. When this method is used in the rolling industry, the service life of the rolls is significantly increased, the number of transshipments for regrinding calibers is reduced, and thereby the productivity of the mill is increased. As a result of using this solution, the expected economic effect will be about 50 thousand: rubles per year. mini material, characterized in that, in order to increase the stability of processing and improve the quality of the surface, o6paf5oTKe expose the surface area of rolling wolves with a temperature of 100-200 ° C during their operation.