SU1726076A1 - System of box passes - Google Patents

Abstract

The invention relates to the metallurgical industry, specifically rolling production, and is intended for rolling metal on large and medium-sized mills. The purpose of the invention is to improve the quality of the blanks by reducing surface defects on all facets of the final product. The system consists of alternating flat box calibers and square calibers. The first gauge gauge is made with a Si bottom bulge equal to (0.1-0.04) VD1. where VD1 is the width of the gauge along the bottom. All subsequent rectangular calibers are made with the convexity of the bottom of Sn, defined by the formula Sn Si t (ain + 1) -a1n, where n is the order number of the gauge during rolling. In the system, the second gauge caliber can be made with a convex bottom, where the convexity value of $ 2 is (0.45-0.55) Si, and the other even gauges are the squaring square gauges alternating with rectangular ones. The reduction of surface defects is achieved by creating favorable conditions for the deformation of the surface layers. 2 hp ff, 2 ill. sl C

Description

The invention relates to the metallurgical industry, specifically to rolling production, and is intended for rolling metal on large and medium-sized mills.

A known system of gauges, including sliding square and rectangular calibers, of a rough and pre-finishing group of stands of billet mills.

However, the system cannot effectively reduce the depth of the surface cracks.

Closest to the proposed is the system of calibers of the draft group.

stands of the continuous mill, including slash, square and rectangular gauges with the presence of convexity in squared slips.

The disadvantage of this system of calibers is the inability to intensify the rolling out of surface cracks and to obtain high quality profiles in it. This is due to the fact that shoulder gables with a convex bottom are used only to stabilize the broadening of the workpiece during compression in the subsequent caliber. Moreover, the value of the convexity S takes values (0.015 -

x |

ON

0.001) WD, depending on the size of the workpiece,

The purpose of the invention is to improve the quality of the blanks by reducing surface defects on all facets of the final product,

This goal is achieved by the fact that in the system of flap gauges consisting of alternating rectangular and square gauges; some of which, including the first one, are made with a convex bottom, the size of the convexity of the Si bottom for the first upper rectangular caliber is equal to

Si (0.1-0.04) VD1

where Vd1 - the width of the caliber on the bottom,

The second caliber is made with a bottom bulge of 0.45-0.55 of the size of the bulge in the first caliber.

In addition, the subsequent straight angle caliber gauges are made with the convexity of the bottom of Sn. equal to

Sn si-p aill + 1) ain,

where n is the serial number of the gauge in the course of rolling.

Fig, 1 shows a system of calibers, where the first two calibers are made with a convexity of the bottom; Fig. 2 illustrates a system in which all rectangular calibers are made with a convexity of the bottom.

The proposed system (FIG. 1) includes a first gauge caliper 1 with convex, where the bump value is S.1 (0.1-0.04) VD1, a second gauge gauge 2 with a convex bottom, where the bump size is $ 2 (0 , 45-0.55) 51 and alternate schichchny rectangular 3 and square 4 calibers.

The proposed gauge system works as follows.

The square blank is crimped in the first cabinet caliber 1, takes the form of a rectangle with a certain amount of Si concavity on the horizontal faces. facets and reduced due to the broadening of the value of the concavity of Si on the vertical faces x. Then, the workpiece enters the rectangular caliber 3, where it takes the form of a regular rectangle, which enters the square caliber 4, etc. Depending on the desired size of the final sectional shape, the rolling of the billet ends in. square squared caliber 6 or

The proposed system (FIG. 2) includes alternating slotted rectangular calibers 1,3,5 and 7 with a convex bottom, where the convexity value is for the first Si caliber (0.1-0.04) Bd1 and for subsequent Sn Si pain + 1) ° 1n and case-size square gauges 2,4,6 and 8.

The proposed system calibers works as follows.

The square blank (bloom) is crimped in the rectangular gated caliber 1 and takes the form of a rectangle with a certain value of Si concavity on the horizontal faces. After turning over 90 °, the billet enters a square gauge caliber 2 at the exit of which the billet has a square shape with straight horizontal edges and a reduced value of Si concavity on the vertical edges x. Next, the workpiece is crimped in a rectangular sliding caliber 3, where it takes the form of a rectangle with a concavity equal to 5 ° on horizontal edges.

After turning 90 °, the workpiece is set into a square caliber gauge 4 where it is crimped to a predetermined height, etc. The rolling of the workpiece ends in a squared caliber 8.

PRI me R 1. Experimental rolling on the proposed system of gauge calibers was carried out by rolling a square billet 134 x 134 mm from bloom 310 x-310 mm. Several variants of the gauge with a convex bottom were made in the first two cells (the first index corresponds to the serial number of the caliber, the second index corresponds to the serial number of figures 1 and 2): 1) 51.1 0.12 VD1.1. 82.1 .6 Si. I; 2) Si.i 0.1-VD1.1, S2.1 0.55 -Si, i; 3) Si., 07-VD1,1, $ 2.1 0.5 -S i.i; 4) 81.1 0.04 VD1.1. 52.1 0.45 Si.i; 5) 51.1 0.02-VD1.1, 52.1 0.4-Si, i.

The system of gauge, rectangular and square gauges differed in the parameters Si, i. 52.1, PDP, 1 in the first two box calibas, the sizes of the remaining box rectangles and square gauges remained constant.

Dimensions of case rectangular and square calibers:

III: hz, 1 216 mm; NDZ, 1 212 mm; Bur, 1,300 mm; Vdz.1 260 mm; gz, 1 20 mm;

IV: H / j, i 204 mm; 84.1,246 mm; VD4.1 206 mm; G4.1 20 mm;

V: Hs, i 155 mm; ND5,1 151 mm; Bs.1 244 mm; VD5.1 214 mm; rs.i 20 mm;

Vi stand: He, 1 185 mm; Be, 1 182 mm; Vde.1 150 mm; GB, 1 20 mm;

VII cage; HT, 1,122 mm; NDU, 1,118 mm; B, 1,182 mm; VD7.1 160 mm; p, 1 15 mm: VIH stand; NV, 1,134 mm; Vvl 135 mm; HL, 1,117 mm; Guards, 1 15 mm.

Sizes of sliding (withdrawable) calibers: first and second stands: For the l-th variant:

 stand: Hi.i 275 mm; ND1.1 205 mm; Bi, i 340 mm; VD1.1 289 mm; Si, i 35 mm; g i.i 20 mm;

II stand: Н2.1 294 mm; HD2.1 252 mm; B2 318 mm. Vd2.1 260 mm; S2.1 21 mm; pg.1 20 mm. For ll-th option:

I: Hi.i 275 mm: Go 217 mm; Si.i 29 mm;

II: H2.1 294 mm; Нд2,1 262 mm; $ 2.1 16 mm.

For option III:

Iklet: Hi.i 275 mm; ND1.1 235 mm; Si.i 20 mm;

II: h2.1 294 mm; ND2.1 274 mm; $ 2.1 10 mm.

For option IV:

I stand: Nor 275 mm; ND1.1 251 mm; Si.i

 12 mm;

I stand: H2.1 294 mm; HD2.1 283.6 mm; S2.1

5.2 mm .. N

By V option :;

Iklet: Hi.i 275 mm; ND1,1., 4 mm; Si.i 5.8 mm;

II: h2.1 294 mm; Nd2.1 289.4 mm; $ 2.1 2.3 mm.

The following results were obtained. Hard (65G) and soft (Yukp) steel grades were rolled. Rolling by a known calibration showed the presence of cracks on the faces of the workpiece, the magnitude of which with respect to the side of the workpiece was 0.014–0.016.

When rolling in gauges made according to the lth variant, along with rolling out surface cracks from the ingot, sunsets on the faces along the entire length of the billet were formed.

When rolling in calibers made according to the II variant, no surface cracks were observed.

When rolling in gauges made according to llt mode, the surface cracks on the faces of the workpiece were absent, the final section had the shape of a regular square.

When rolling in gauges made according to the 4th variant, surface cracks were not observed along the length of the workpiece.

When rolling in calibers made according to the V-th variant, the surface cracks had a value equal to the value of the cracks obtained during the rolling of billets according to the known calibration.

PRI mme R 2. To carry out pilot rolling in the proposed system of square gauge billet 134 x 134 mm

some 285 x 285 mm blooms have been made for several calibrations with a rectangular, wide, with a convex bottom in odd cells; 1) 51.2 0.12- BAi, 2, Sn, 2 Si.2-lf1n + 1 ain:

2) Si.2-0.1-Edi, Sn, 2 Si.2- -n4; ° -n; 3) 81.2 0.07-VD1.2. 8 „.2 81.2 I1, n. 4) Si, 2 0.04-BAl.2, Sn.2 Si.2-rf 1n + iain; 5) 81.2 0.02-Bdi, Sn, 2 Si.2-f ° 1n + 1) ° 1n; 6) Si, 2 0.1-BAi, 2, Sn.2 Su-r 1n + 1 ° 1n;

7) Su 0.04-BAi, 2, Sn, 2 Si.2 f J-1n + 1) 0 1n; 8) Si.2 0.07-BAi, 2, Sn, 2 Si, 2 - .. n + i) o.in. Experimental systems of calibers differed in the parameters of Sn, 2, NDN, 2 in rectangular shoe calibers of odd stands, the sizes of square protective calibers remained constant.

Dimensions of case square gauges: Stand II: On, 2 240 mm; Vd2.2 258 mm; B2,2

310 mm; G2.2 20 mm;

IV: Shch.2 203 mm; 198 mm; B4.2 237 mm; G4.2 20 mm;

VI: Ne.2 166 mm; Vde, 2. 162 mm; Vb.2 198 mm: ge.2 20 mm;

VIII stand: HB, 2,134 mm; VD8.2 130mm; BB, 2

154 mm; Guv.2 15 mm.

Sizes withdrawable gauges.

For the lth option:

I stand: Hi, 2,278 mm; ND1,2 209.6 mm; VD1.2 285 mm; Bi, 2,230 mm; Si, 2 34.2 mm;

III stand: Нз, 2 209 mm; Ndz, 2 162.7mm;

Vdz.2 268mm; Second, 2 304mm: 5hz, 2 23.15 mm;

V: Hs, 2 170 mm; ND5.2 137.7 mm; VD5.2 215 mm; BS, 2,248 mm; Ss.2 16.15 mm;

VII stand: N, 2 138 mm; ND7.2 117.2 mm:

VD7.2 175 mm; B.2 198 mm: $ 7.2 10.4 mm.

llth option:

I stand: Ndi 220.2 mm; 51.2 28.9mm;

111 stand: Ndz, 2 170.2 mm: 5z.2 19.4 mm; v stand: ND5.2 143 mm; Ss.2 13.5 mm;

VII: ND7.2 120.6 mm; $ 7.2 8.7 mm. By W-th option:

t stand: ND1,2 238 mm; $ 1.2 20mm;

III stand: Ndz, 2 182 mm; 5з, 2 13.5 mm; v crate. ND5.2 151.2 mm; Ss.2 9.4 mm;

VII stand: ND7.2 126 mm; S7.2 6 mm.

According to IV-th option:

I stand: ND1,2 255 mm; . 81, .5mm;

III stand: Ndz, 2 193.4 mm; ZZ, 2 7.8 mm; v stand: ND5.2 159.2 mm; 8c, 2 5.4 mm;

VII stand: ND7.2 131 mm; $ 7.2 3.5 mm.

By V-th option:

I stand: ND1.2 266.5 mm; Si, 2 5.75 mm;

III stand: Ndz, 2 201.2 mm; 8z, 2 3.9 mm;

V stand: ND5.2 164.6 mm; 55.2 2.7mm;

VII stand: ND7.2 134.5 mm; S.2 1.75 mm; By Vl-th option:

I stand: ND1.2 220.2 mm; Si.z 28.9 mm; III stand: Ndz.2 167 mm; Sz.2 21 mm; V stand: ND5.2 140 mm; Ss.2 15 mm; VII cage: Nd, 2,118 mm: 5t.2 10 mm. By Vll-th option:

I stand: ND1.2 255 mm; Si.2 11.5 mm; III stand: Ndz.2 197 mm; 5з, 2 6 mm; V stand: ND5,2 162 mm; Ss.2 4 mm; VII stand: ND7.2 134 mm; S7.2 2 mm; By Vlll-th option :.

a) I stand: ND1.2 238 mm: Si, 2 20 mm; III stand: Ndz.2 169 mm; 5з, 2 20 mm; V stand: ND5.2 151.2 mm; Ss.2 9.4 mm; VII stand: Nd, 2,126 mm; S.2 6 mm;

b) I stand: Ndi 233 mm; Si, 2 20 mm; III stand: Ndz, 2 190.2 mm; 5z.2 9.4 mm; V stand: ND5.2 151.2 mm: Ss.2 9.4 mm: VII stand: Nd.2 126 mm; Sr, 2 b mm;

c) II stand: ND1.2 238 mm; Si.2 20 mm: Stand III: Ndz, 2 182 mm; 5z, 2 13.5 mm: V stand: ND5.2 151.2 mm: Ss.2 9.4 mm; VII stand: Nd, 1 120 mm; $ 7.2 9 mm;

d) I stand: ND1.2 238 mm; Si.2 20 mm; III stand: Ndz.2 182 mm: Зз.2 13.5 mm: V stand: НД5.2 151.2 mm: Ss2 9.4 mm: VII stand: НД7.2 132 mm; 87.2 3 mm.

The following results were obtained.

At pilot rolling, metal 08 KP and sp steel grades were used. When rolling according to a known calibration, the faces of the blanks had surface cracks of a depth of 0.015 from the side of the blank. When rolling according to the calibration of the 1st version, a sunset was formed on the edges of the workpiece along its entire length.

When rolling in gauges made according to the 11th variant, surface cracks were absent, but the faces had an insignificant amount of concavity.

When rolling in calibers made according to the 111th variant, the surface of the workpiece was clean, without cracks.

When rolling in gauges made according to the 4th variant, surface cracks were observed at 5% of the entire length of the billet, the depth of which was 0.004 from the side of the billet.

When rolling on a V -ro calibration, the results were identical to those of the prototype.

Rolling in calibers Vl-ro version led to the formation of sunsets on the edges of the workpiece and the non-receipt of the desired shape over the cross section of the profile.

When rolling in calibers made on the Vll-th variant, the results did not differ from the results of the prototype.

Rolling in calibers of the Vlll-ro variant showed the following results: sunsets formed on the faces of the workpiece along its entire length; low rollout intensity and the presence of surface cracks, the depth of which was 0.06 from the side of the workpiece; the presence of residual concavity on the verge,

Claims (3)

1. A system of schizhnichnyh calibers, consisting of alternating rectangular and square calibers, some of which, including the first, are made with a convex bottom, characterized in that. with the aim of improving the quality of the workpieces by reducing surface defects, the size of the Si of the convexity of the bottom for the first flat rectangular caliber is made equal to (0.1-0.04) Cd, where Bd is the width of the caliber the bottom. 2, the system according to claim 1, characterized in that, in order to reduce surface defects on all faces of the final product, the second caliber is also made with a bottom bulge of 0.45-0.5 Si. 3. The system according to claim 1, characterized in that, in order to reduce surface defects on all facets of the final product. The subsequent rectangular shoe gages are made with the convexity of the bottom Sn Si jri0 1 1 1) 0 1 Where n is the order number of the gauge during rolling.