SU1491595A1 - Method of tuning pilger rolling mill - Google Patents

Abstract

The invention relates to ferrous metallurgy and is intended for use in pipe production, and more specifically in cold tube rolling mills, preferably with a movable stand. The aim of the invention is to reduce the labor intensity. A coating of contrast with color is applied to the flanges of calibers before rolling. It can be either single-layered or multi-layered with differing colors of a certain thickness of the layers. At the same time, the control of the gap between the rollers is accelerated and improved, and the possibility of running the mill "in running-in" is completely eliminated. In addition, the influence of the subjective human factor — the skill level of the mill operator — is eliminated. 2 hp f-ly, 1 ill.

Description

one

(21) 4370100 / 23-02.

(22) 11/23/87

(46) 07.07.89. Vul. 25

(75) A.V.Gamershteyn, V.B.Morozov,

A.-M.Petrenko, V.A.Gamershtein,

V.L. Lapidus, A.L. Tseutin and I.S. Verkhovsk

(53) 621.774.36 (088.8)

(56) Koff Z.A., Soloveichik P.M., Aleshin V.A., Grinshpun M.I. Cold rolling of pipes, Sverdlovsk: Metallurgizdat, 1962, p. 282-287, 302.

USSR author's certificate P68307, cl. B 21 B 21/00, 1983.

(54) METHOD OF SETTING PSHGREIM MILL

(57) The invention relates to ferrous metagsurgy and is intended for use in pipe production, and more specifically in cold rolling pipes, mainly with a moving stand. The aim of the invention is to reduce the labor intensity. A coating of contrast with color is applied to the flanges of calibers before rolling. It can be either single-layered or multi-layered with differing colors of a certain thickness of the layers. At the same time, the control of the gap between the rollers is accelerated and improved, and the possibility of running stalls in running-in is completely eliminated. In addition, the influence of the subjective human factor, the skill level of the mill operator, is eliminated. 2 hp ff, 1 ill.

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The invention relates to ferrous metallurgy and is intended for use in pipe production, and more specifically in cold tube rolling mills, preferably with a moving stand.

The aim of the invention is to reduce the labor intensity.

The method of adjusting the mill mill is based on applying to the surface of the flanges of the calibers of the rolls of a single or multi-layered coating contrasting with them in color. To increase its functional reliability and increase the productivity of the coating, a chemically deposited layer of copper is used. Thickness

The coating layer of each flange is 0.067-0.107 of the nominal clearance.

In a multilayer coating, the thickness of the subsequent layer, in addition to the first one, is chosen equal to 0.027-0.053 of the nominal gap size.

If the thickness t of the coating layer is thinner than the lower limit of 0.067 s (where s is the nominal value of the initial gap between the flanges before rolling), the service life of the mill's mechanical equipment is reduced due to an increased likelihood of running gauges running in, and the quality of pipes decreases. for sunsets.

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If the thickness t of the coating layer is greater than 0.107 S, then the service life of a stream of calibers and the duration of their work between successive transshipments decreases and the frequency of transshipments and settings increases. In order to eliminate the possibility of the initial mutual contact of the gauges of the rolls with their flanges, the coating is made multi-layered, and the color of each layer is different from the color of any other layer.

With a multi-layer coating, the thickness of each layer, except the first, is (0,027-0,053) of the nominal value of the specified gap.

The choice of the thickness of each layer, starting with the second (if we count them in the order of application), is due to the fact that erasing these layers does not mean immediately stopping the mill and starting transshipment, but only calls for vigilance, warns in advance that the moment will come: the need for such a stop. Therefore, its thickness may be the smallest.

The drawing shows the layout of the calibers in the deformation points close to the extreme places of length.

The method for adjusting the milling mill is as follows.

Before installing the gauges of the rolling rolls, a metal layer - a copper layer - is applied to the workplace in the stand (all areas) Q and Qe of the non-working cylindrical surface of the flanges of each gauge 1 and 2.

The chemical or electrochemical interaction of the chosen solution with steel gauges on their flanges forms an other coating of orange color, which as a substance is deposited Cu copper.

A thickness of the resulting single layer coating is required when

8 "0.75 mm (for example) is equal to

t | 0.05-0.08 mm;

tj tb 0.02-0.04 mm.

In a multilayer coating, as in a single layer, the first layer is a copper cladding layer of orange color. This layer and its adhesion to the base are the strongest - at the level of the chemical compound

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atomic bond count due to substitution reaction.

The second layer of the three-layer coating is green lacquer.

The third layer of a three-layer coating is varnish. black color. Both varnishes mark NTs-134.

The thickness of each layer of paint and varnish coatings is measured after drying with a thickness gauge, such as magnetic, such as MTA-1. Thus, all three layers have three different colors: orange, green and black, - all three colors are contrasted to each other and in comparison with the gray color of steel.

Since the second and third layers are made of paints and varnishes, they are applied by brush, roller or spray. The paintwork material of the second and third layers and their adhesion to the previous layer have strength due to the adhesion forces of the second layer with the microroughness of the metal surface of the first layer and the adhesion of the third layer with the microroughness of the dried paintwork surface of the second layer.

After coating, the mill is adjusted to working rolling, the geometrical axis of the mill is aligned along the rolling axis, the mill rolls and gauges 1 and 2 are correctly set and fixed in the working stand, and the nominal clearance between the flanges of the latter is normally adjusted.

As a result, the implementation of this indication of the presence or absence of a gap between the flanges calibers during rolling mill is ready and you can start rolling.

When rolling, the operator, in the time interval, intersects rolling of each previous and subsequent, pipe looks at the non-working cylindrical surfaces of the flanges of gauge 1 and 2. If he sees on them the orange color of the single-layer coating or the black color of the third layer of the multilayer coating, Combi rolling, for the preservation of the color of the coating means the integrity of this coating and, consequently, the presence of a gap between the flanges. If the operator with a single-layer coating sees on the same surfaces of the flanges the gray color of the gauge metal, then the psokatka is stopped, because the disappearance of the coating color means its abrasion

Claims (3)

Claim 1. Pilgrimo tuning method ^- : 5th mill, including the implementation of thickenings on the flanges of the rolls and control of the gap between the rolls, characterized in that, in order to reduce the complexity, thickenings on 10 flanges of the rolls are performed in the form of a contrasting color coating with a layer thickness of 0.0670.107 nominal value the gap between the fleece. fifteen 2. The method of pop. 1, characterized by the fact that a chemically deposited layer of copper is applied as a contrast coating. I 3. The method of pop. ^ characterized in that the coating is applied in a multilayer of different colors and with a layer thickness of, apart from the first, 0.027-0.053 of the nominal value of the gap between the rollers.