Metal deforming – With cleaning – descaling – or lubrication of work or product – Mechanical cleaning
Patent
1988-09-21
1990-04-24
Combs, E. Michael
Metal deforming
With cleaning, descaling, or lubrication of work or product
Mechanical cleaning
B21B 4506
Patent
active
049189603
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the metallurgical industry, and more particularly, to a method for removing scale from a metal strip.
2. Description of the Prior Art
Known in the art is a method for removing scale from a metal strip (SU, A, 902378) wherein the strip passes vertically upwards through a working chamber which is filled with a ferromagnetic abrasive powder and has a means for pressing the powder to the strip which is made in the form of blades fixed to shafts mounted for rotation about axes 30.degree.-40.degree.. The blades press the powder from both sides to the surface of the moving strip, and magnets arranged behind the shafts facilitate compacting the powder, thereby effecting a two-sides removal of scale from the moving strip.
A disadvantage of this method consists in that a vertical position of the strip during treatment stipulates large dimensions of the working chamber as to height, which increases the height of the workshop building and crane tracks and this, in turn, entails additional capital costs. Besides, the working chamber is rather metal intensive, and an appreciable amount of expensive nonmagnetic steel is needed for its manufacture, and in the final analysis, at least three bypass rollers 1.1 to 1.2 m in diameter are required to transfer the strip from horizontal to vertical position and back, which involves additional expenditure of metal for the rollers per se and power to bend the strip therethrough.
Known in the art is a method for removing scale from a strip (SU, A, 887048), wherein powder and the strip being cleaned are pressed to each other, the strip moving flat in a horizontal position through slits in the side walls of the working chamber having the form of a tube, in so doing, the powder is fed to the chamber from the side and is pumped with the aid of a piston along the axis of the tube in the opposite end of which there is provided a valve to remove the powder.
This method has a number of advantages over the above-mentioned, namely, it does not require bypass rollers and bending of the strip therethrough, and the working chamber is markedly smaller in height. However, as tests show, it is difficult to realize this method in practice because the powder pressure against the strip along the chamber length (i.e., in the strip width) drastically declines due to appreciable losses for powder friction against the working chamber wall. As a result, the strip is cleaned nonuniformly in width, the chamber walls wear out quickly, power consumption for pumping the powder along the chamber is extremely high, the replacement of powder is complicated. Thus, the advantages of a strip horizontal position in this method cannot be actually realized.
Besides, the presence of a special tank for powder, i.e. a working chamber, not only compounds the cleaning method, but requires substantial costs for manufacturing this chamber and its maintenance.
SUMMARY OF THE INVENTION
The present invention has as its object to provide a method for removing scale from metal strips, wherein the scale removal is ensured through pressure created by the moving strip per se, without using the tank for holding ferromagnetic powder, which makes it possible to simplify the method realization, reduce the unit dimensions in length, and improve the quality of cleaning.
This aim is achieved by a method for removing scale from metal strips, comprising stretching the strip flat horizontally through the cleaning zone having a ferromagnetic abrasive powder, and mutual pressing of the powder and the surface of the strip being cleaned as the latter moves, as well as feeding the powder to the cleaning zone and its withdrawal from this zone. According to the invention, the strip is stretched through the cleaning zone first in one direction, then in the opposite one, thereby forming lower and upper branches from the strip, and the cleaning zone is arranged between these branches.
Accommodating the cleaning zone between the two-upper and lower branches of the s
Danilov Leonid I.
Garber Eduard A.
Lipukhim Jury V.
Subbotin Anatoly N.
LandOfFree
Method for removing scale from a metal strip does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for removing scale from a metal strip, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for removing scale from a metal strip will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-27236