SU1592066A1 - Method of operating rolls of continuous merchant rolling mill - Google Patents

Description

The invention relates to ferrous metallurgy and can be used in the processing of metals by pressure on continuous mills, in particular

2

on billet, section rolling and wire. The purpose of the invention is to increase the duration of the operation of the mill between transshipments by ensuring uniform wear of the rolls on the glue. tyam The adjustment of the inter-roll gaps in the rolling process is carried out

η

in accordance with condition 2 (P ^, · M

-P _! ) ^{2 v} · <// ν _{ΜΜ -ν η} / ^ Γηΐη, where η is the number of stands; R _oh! - the rolling efforts at the stands at the beginning of the campaign, i.e. with zero roll wear; - nominal

rolling speed in the finishing stand; ν _η is the actual rolling speed in the finishing stand; οί = 1.01-1, 15 is the coefficient of the effect of the adjustment of the inter-roll gaps in the mill stands on the change in the limiting state of the rollers of the finishing stand. 2 tab.

The invention relates to ferrous metallurgy and can be used in the processing of metals by pressure on continuous mills, in particular on billet, section-rolled and wire.

The purpose of the invention is to increase the duration of operation of the mill between transshipments by ensuring uniform wear of the rolls on the stands.

Ave. The implementation of the method on the mill 320/150 when rolling 0 10 of steel 20GS. The value of the prog parameters. Rollers: force, rolling speed and gaps between the rolls in the stands, respectively: 1 - 1856 kN, 0.6 m / s, 24 mm;

2 - 1516 kN, 0.76 m / s, 8 mm; 3 1678 kN, 1.06 m / s, 6 mm; 4 - 1200 kN,

1.4 m / s, 8 mm; 5 - 1304 kN, 1.88 m / s, '6 mm; 6 - 748 kN, 2.33 m / s, 6 mm; 7 1429 kN, 3.45 m / s, 5 mm; 8 - 828 kN,

4.58 m / s, 5 mm; 9 - 964 kN, 5.72 m / s, 5 mm; 10 - 760 kN, 6.86 m / s, 5.3 mm;

11 - 653 kN, 6.73 m / s, 4.5 mm; 12,636 kN, 7.92 m / s, 4.0 mm; 13 - 748 kN, 5.81 m / s, 3.0 mm; 14 - 821 kN,

6.99 m / s, 4.3 mm; 15-711 kN,

9.45 m / s, 3.2 mm; 16- 243 kN, 11.14 m / s, 3.0 mm; 17 - 475 kN, 13.16 m / s, 2.8 mm; 18 - 175 kN, 15.26 m / s, 3.0 mm; nineteen - 374 kN, 17.28 m / s, 2.5 mm; 20 - 107 kN, 20 m / s, 1.3 mm. As a parameter minimization

serves as the value of rolling accuracy

δ and .... 1592066

>

1592066

? 0, 1 mm. As gauges wear out, compression decreases (decreases by the amount of production of the working surface of the roll). The values of rolling forces and speeds change accordingly, acquiring P values; and ν _{η <} . The deviation of the rolling speed ν ,, from the nominal ν _{Η θΛ} * reaches the highest value in the finishing stand due to the highest total draw in this stand. The adjustment of inter-shaft gaps in the rolling process is carried out using a control computer in accordance with the condition

η

where η is the number of stands; 20

P _# 1 - rolling effort in cages

the beginning of the campaign, i.e. with zero roll wear;

R. · - effort rolling on cages at

the actual gaps between shaft 25 kami;

^ν Κο »

and ν _η - nominal and actual

rolling speed in the finishing stand;

</ = 1,011,15 - the coefficient of the effect of the adjustment of the inter-roll gaps in the mill stands on the change in the limiting state of the rolls of the finishing stand, in this example </ = 1,08.

A factor of 3, the effect of the adjustment of the inter-roll gaps in the mill stands on the change in the limiting state of the rolls of the finishing stand shows how weighty the influence of the adjustment on the improvement of the operating conditions of the rolls of the finishing stand. Transfer of the rolls of the finishing stand is carried out when the specified condition is not met.

In tab. 1 shows the changes in the limiting state of the rolls of the finishing stand with parameters whose values fall outside the proposed range and the goal is not achieved. At the same time, in the proposed range, the resource of the rolls is fully used.

thirty

35

40

45

50

The analysis of tabular data shows that in 17 stands, the operating time to the limit state increases on average by 2–15% (Table 1). The operating time in the finishing stand increases significantly (by 17.4%), which makes it possible to improve the quality of rolled products and increase the time between transshipment points.

I

The use of the invention improves the productivity of the mill, reduces downtime of the mill during transshipments, reduces the consumption of rolls and the cost of production of rolled metal, allows you to achieve savings rolled metal by running the rolling process at minus tolerances.

Claims (2)

Formula of the invention A method of operating rolls of a continuous mill mill including filling the rolls into a cage, operating during the campaign with measuring and adjusting efforts and speeds through the mill stands, cutting out and restoring workability, characterized in that in order to increase the durability of the mill between transshipments by ensuring uniform wear of the rolls in the stands, during operation, the forces and speeds in the stands are adjusted in accordance with the condition έ (ΡΟ1 · -Ρί) 2 + ο / | νΗθΜ-νπ | έπιϊη, Ιϊί 'where η is a number stands; R#. - rolling efforts at the stands at the beginning of the campaign, i.e., with zero roll wear, t; P · - rolling effort on cages with actual gaps between - g. Rolls, t; . ν. - rated rolling speed He ”„ / in the finishing stand, m / s; · Νη - actual rolling speed in the finishing stand, m / s; </ = 1,011,15 - the coefficient of the effect of the adjustment of the inter-roll gaps in the mill stands on the change in the limiting condition of the rolls of the finishing stand; tkhp - a minimum of the functional, equal permissible deviation of the thickness of rolled metal, mm and casting rolls carried out at inefficiency inequality. As a result of the implementation of the operation of the rolls, their operating time is set to the limit state in the mill cages (Table 2). 1592066 6 Table! Options The coefficient of reducing the limit state (time to failure) rolls Continuously — billet and large-size mills lower limit 1.00 1.29 lower 1.01 1.0 the average 1,025 1.0 top 1.05 „ 1.0 going beyond the top limit 1.06 1.22 Small section mills lower limit 1.05 1.20 lower 1.06 1.0 • the average 1.08 1.0 top. 1.10 1.0 going beyond the top limit 1.11 1.18 Wire Mills lower limit 1.10 1.17 lower 1.11 1.0 the average 1.13 1.0 top 1.15 1.0 going beyond the top limit 1.16 1.15 Table 2 Stand Known method The proposed method Hours per roll, t The multiplicity of yaraboT of the йth and finishing stands is H-Cl. / H.cl. Working hours on the roll to the limit of 'state, t Operating time before scheduled transshipment, t The multiplicity of developments of the ί th and finishing Kleu N ^ Kl. / Nch.kl Draft Group one . 57980 34.03 57015 56000 28 2 97625 57.29 95300 94000 47 3 48524 28.47 48800 48000 24 four 91028 53.42 94630 94000 47 five 61825 36.28 62870 62000 31 6 68895 40.43 68010 68000 34 Intermediate naya group 7 32010 18.78 / . 36420 36,000 18 eight 94276 55.33 96200 96000 48 9 8992 5.28 10,000 10,000 five ten 40,500 23.77 45020 44000 22 eleven 10450 6.13 10,800 10,000 five 12 34200 20.07 36990 36,000 18 13 9088 5.33 10540 10,000 five 14 15686 9.21 16080 16,000 eight 1592066 Continued tabl .2 Stand Known method The proposed method - Working hours Multiplicity Working hours Working hours Multiplicity per roll, t groundwork on the roll before planned groundwork 1st and nu to the limit transshipment 1st and nu ·· Comrade Oh cages of his t rolling stands N _{ kl. / Nch.kp. stories, t H | Kl. / Nc.kp. Fair • Group 15 5310 3.12 6300 6000 3 . sixteen 13500 7.92 13600 12,000 6 17 4750 2.79 6100 6000 3 18 8,000 4.69 8800 8,000 four nineteen ' 2016 1.88 2080 2000 one . 20 1704 - 2000 2000 -