CN113857238A

CN113857238A - 12 mm-specification wire rod rolling method

Info

Publication number: CN113857238A
Application number: CN202110929361.4A
Authority: CN
Inventors: 朱传清; 余坤洋; 周锋; 鲍振振; 沈克非; 何力国
Original assignee: Rizhao Steel Holding Group Co Ltd
Current assignee: Rizhao Steel Holding Group Co Ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2021-12-31
Anticipated expiration: 2041-08-13
Also published as: CN113857238B

Abstract

The invention provides a 12 mm-specification wire rod rolling method, which mainly comprises the following steps: in the finish rolling procedure, 6-pass finish rolling and a hole type system C matched with the 6-pass finish rolling are adopted; the hole pattern number in the hole pattern system C is 127 ', 128 ', 129 ', 130, BE3-02 and BR4-14 in sequence. In the method, the pass system C is combined with 6-pass finish rolling, so that the rolling process is easy to control, and the obtained wire rod with the diameter of 12mm is good in quality uniformity, high in size qualification rate and less in head and tail waste; the arrangement of the hole pattern system C can effectively improve the universality of the rolling method, so that the wire rods with the specifications of phi 5 mm-phi 16mm can be finished by one set of rolling method.

Description

12 mm-specification wire rod rolling method

Technical Field

The invention relates to the technical field of wire rod rolling, in particular to a rolling method of a wire rod with a 12mm specification.

Background

During the production of the wire rod, the wire rod with different specifications is obtained by rolling a casting blank in sequence through three processes of rough rolling of a rough rolling mill, pre-finish rolling and finish rolling of a finish rolling mill. Generally speaking, the rough rolling process of a casting blank has a small specification relation with a wire rod, so the rough rolling process is a general process; the pre-finish rolling process and the finish rolling process directly affect the dimensional accuracy of the wire rod, and therefore, the hole pattern systems and the like of the pre-finish rolling process and the finish rolling process can be changed along with the size of the wire rod.

The production cost of the wire rod directly influences the economic benefit, so that the cost reduction is an important way for improving the economic benefit on the premise of ensuring the quality. Common wire rod specifications comprise phi 5.5mm, phi 7mm, phi 9mm, phi 11mm, phi 12mm, phi 14mm, phi 16mm and the like, and factors influencing the production cost of the wire rod comprise a rolling pass, a rolling mill and a hole pattern system, wherein the wire rods with the phi 5.5mm, the phi 7mm, the phi 9mm, the phi 11mm, the phi 14mm and the phi 16mm can complete the production of the wire rod under the condition of sharing one hole pattern system by controlling the pass, and the cost is low.

The phi 12mm specification wire rod is between phi 11mm and phi 14mm, and the rolling process has 22 rolling passes, specifically: in the rough rolling process of 1-14 passes, the hole pattern system is the same as the wire rod with the specification of phi 11mm and phi 14 mm; in the pre-finish rolling process of 15-18 times, the hole pattern system is the same as the wire rods with the specifications of phi 11mm and phi 14 mm; in the 19-22 pass finish rolling process, a pass system is different from wire rods with the specifications of phi 11mm and phi 14mm, and the pass system needs to be independently equipped, so that the roll collar allocation amount is increased, the labor intensity is increased, and the universality of the wire rod rolling system is reduced; in addition, the 4-pass finish rolling process makes the phi 12 mm-specification wire rod difficult to adjust in size in the rolling process, so that the out-of-roundness and the inner diameter of the finished phi 12 mm-specification wire rod are difficult to reach the standard, and further the phi 12 mm-specification wire rod is difficult to control in quality, much in head and tail waste and not beneficial to economic and continuous production of the phi 12 mm-specification wire rod.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a rolling method of a wire rod with the 12mm specification, wherein in the rolling method, a finish rolling procedure adopts 6-pass finish rolling; in the pass system C matched with 6 passes of finish rolling, the pass numbers are 127 ', 128 ', 129 ', 130, BE3-02 and BR4-14 respectively. In the method, the pass system C is combined with 6-pass finish rolling, so that the rolling process is easy to control, and the obtained wire rod with the diameter of 12mm is good in quality uniformity, high in size qualification rate and less in head and tail waste; the arrangement of the hole pattern system C can effectively improve the universality of the rolling method, so that the wire rods with the specifications of phi 5.5 mm-phi 16mm can be finished by sharing one set of rolling method.

The technical scheme of the invention is as follows:

a12 mm specification wire rod rolling method mainly comprises the following processes: in the finish rolling procedure, 6-pass finish rolling and a hole type system C matched with the 6-pass finish rolling are adopted;

the hole pattern number in the hole pattern system C is 127 ', 128 ', 129 ', 130, BE3-02 and BR4-14 in sequence;

the hole type is 127' and the hole type parameter is R ═ 19mm, b_k＝28.44mm，h＝16.2mm；

The hole type is 128', the hole type parameter is R is 9mm, b_k＝18.21mm，h＝16.9mm，α＝20°；

The hole type is 129', the hole type parameter is R is 17.5mm, b_k＝24.08mm，h＝11.2mm；

The hole pattern parameter of 130 is R7.12 mm, b_k＝14.36mm，h＝14.24mm，α＝15°；

The hole type is BE3-02, the hole type parameter is R ═ 14mm, b_k＝20mm，h＝9.46mm；

The hole pattern of BR4-14 has a parameter R of 6.08mm, b_k＝12.41mm，h＝12.16mm，α＝18°。

Preferably, in the finish rolling step of the above rolling method, the finish rolling mill has 10 stands, numbered as finish No1, finish No2, finish No3, finish No4, finish No5, finish No6, finish No7, finish No8, finish No9, and finish No 10; 6-pass rolling is carried out by sequentially using refined No3, refined No4, refined No5, refined No6, refined No7 and refined No 8; the 10-frame finishing mill performs centralized transmission, the speed of each frame is matched through a gear system of the finishing mill, and the rolling speed is higher the later the pass is.

Preferably, in the finish rolling step, the rolling speed of finish No8 is 40 m/s.

Preferably, the rolling method further includes a rough rolling step and a pre-finish rolling step.

Preferably, the rough rolling procedure adopts 14-pass rough rolling, and the pre-finish rolling procedure adopts 4-pass pre-finish rolling.

Preferably, in the rough rolling process, the pass system matched with the rough rolling mill is a pass system a, the pass numbers in the pass system a are 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, 11#, 12#, 13#, and 14#, and the pass parameters are respectively:

the parameter of the box-shaped hole pattern with the hole model number of 1# is r₁＝15°，r₂＝11°，b_k＝162mm，h＝116mm；

The parameter of the box-shaped hole pattern with the hole model number of 2# is r₁＝15°，r₂＝10°，b_k＝116mm，h＝123mm；

The parameter of the elliptical hole with the type number of 3# is R ═ 260mm, b_k＝132mm，h＝84mm；

The circular hole type parameter of the hole type 4# is R ═ 51mm, b_k＝109mm，h＝102mm，α＝30°；

The parameter of the elliptical hole with the type number of 5# is that R is 103mm, b_k＝134.5mm，h＝61mm；

The circular hole type parameter of the hole type 6# is that R is 39mm, b_k＝83mm，h＝78mm，α＝30°；

The parameter of the elliptical hole pattern with the hole model number of 7# is that R is 77.8mm, b_k＝99.5mm，h＝49mm；

The circular hole pattern parameter of the hole model number 8 is R equal to 29.3mm, b_k＝62.9mm，h＝59.5mm，α＝30°；

The parameter of the elliptical hole pattern with the hole model number of 9 is that R is 57.4mm, b_k＝74mm，h＝37mm；

The circular hole pattern parameter of the hole model number 10 is R ═ 23mm, b_k＝48.5mm，h＝46mm，α＝30°；

The parameter of the elliptical hole pattern with the hole model number of 11# is that R is 49.2mm, b_k＝59.45mm，h＝28mm；

The circular hole type parameter of the hole type 12# is R ═ 19mm, b_k＝40.4mm，h＝38mm，α＝30°；

The parameter of the elliptical hole pattern with the hole model number of 13# is 41.3mm,b_k＝49.14mm，h＝23mm；

the round hole type parameter of the hole type 14# is that R is 15.5mm, b_k＝32.9mm，h＝31mm，α＝30°；

Preferably, in the pre-finishing rolling process, the hole pattern system matched with the pre-finishing rolling mill is a hole pattern system B, the hole pattern numbers in the hole pattern system B are E15-03, R16-03, E17-03 and R18-03 in sequence, and the hole pattern parameters are respectively as follows:

the hole type parameter of the hole type E15-03 is R ═ 29mm, b_k＝38.48mm，h＝18.5mm；

The hole type R16-03 has the hole pattern parameter R of 11.5mm, b_k＝24.71mm，h＝23mm，α＝30°；

The hole type parameter of the hole type E17-03 is that R is 21.4mm, b_k＝29.72mm，h＝16.1mm；

The hole type R18-03 has the hole pattern parameter R9.75 mm, b_k＝20.26mm，h＝19.5mm，α＝30°。

Preferably, among the roughing mills, the rolling mill name of roughing No1-No6 is phi 610 rolling mill, the rolling mill name of roughing No 7-roughing No12 is phi 430 rolling mill, and the rolling mill name of roughing No 13-roughing No14 is phi 370 rolling mill; in the pre-finishing mill, the name of the pre-finishing No 1-pre-finishing No4 rolling mill is phi 285 cantilever rolling mill; among finishing mills, the mill name of finish No 1-finish No10 is the Morgan 5 generation top cross 45 degree mill.

Compared with the prior art, the invention has the beneficial effects that: according to the rolling method provided by the invention, the finish rolling pass in the finish rolling procedure is controlled to be 6 times, so that the finish rolling procedure is favorably controlled, and the universality of the rolling method can be effectively improved by configuring the pass system C matched with the finish rolling pass; the rolling passes are matched with the pass system C, so that the wire rod with the specification of phi 5.5 mm-16 mm can be finished by one set of rolling method, and the obtained wire rod has good quality uniformity, high dimensional qualification rate and less head and tail waste.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a hole pattern diagram of hole type 127'.

FIG. 2 is a hole pattern diagram of hole type 128'.

Detailed Description

In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In examples 1 to 7 and comparative example 1 of the present invention, the roughing mill in the roughing step and the pass system a matched with the roughing mill are shown in table 1 as follows:

TABLE 1 roughing mill and pass System A

In examples 1 to 3 of the present invention, the pre-finishing mill and the hole pattern system B matched with the pre-finishing mill in the pre-finishing rolling process are shown in table 2 as follows:

TABLE 2 PRE-FINISHING MILL AND HOLE SYSTEM B

In examples 1 to 7 of the present invention, the finishing mill in the finishing rolling process and the pass system C matched with the finishing mill are shown in table 3 as follows:

TABLE 3 finishing Mill and pass System C

In the case pass parameter, r₁Is a rounded corner of the groove bottom r₂Is a notch fillet; b_kThe width of the groove bottom is unit mm; h is the hole pattern height in mm; in an oval-round hole pattern, R is the radius of the hole pattern and is in mm; b_kIs the width of the notch, unit mm; h is the hole pattern height in mm; alpha is a cutting angle; FIG. 1 shows a schematic structural diagram of an oval hole pattern, specifically 127'; fig. 2 shows a schematic structural diagram of a round hole type, specifically a structural diagram of 128'.

In the following examples and comparative examples of the invention, a roughing mill was used with 14 stands, numbered in sequence: coarse No1, coarse No2, coarse No3, coarse No4, coarse No5, coarse No6, coarse No7, coarse No8, coarse No9, coarse No 10; the pre-finishing mill adopts 4 frames, and the serial numbers are as follows in sequence: pre-essence No1, pre-essence No2, pre-essence No3, pre-essence No 4; the finishing mill adopts 10 frames (the examples 1-7 of the invention are all based on the existing production line for experiments), and the serial numbers are finishing No1, finishing No2, finishing No3, finishing No4, finishing No5, finishing No6, finishing No7, finishing No8, finishing No9 and finishing No10 in sequence.

Example 1

A rolling method of a 12mm specification wire rod comprises a rough rolling procedure, a pre-finish rolling procedure and a finish rolling procedure;

wherein the rough rolling procedure adopts 14-pass rolling, the pre-finish rolling procedure adopts 4-pass rolling, and the finish rolling procedure adopts 6-pass rolling to obtain a wire rod with the specification of 12 mm; in the finish rolling step, the rolling speed of finish No8 was 40 m/s.

In the rolling method, the hole types and the pass parameters in the rough rolling process are shown in table 1, the hole types and the pass parameters in the pre-finish rolling process are shown in table 2, and the hole types and the pass parameters in the finish rolling process are shown in table 3.

In this example, the raw materials are characterized in that: 160mm 12000 mm.

Example 2

In the rolling method, the hole types and the pass parameters in the rough rolling procedure adopt a table 1, the hole types and the pass parameters in the pre-finish rolling procedure adopt a table 2, and the hole types and the pass parameters in the finish rolling procedure adopt a table 3;

in this example, the raw materials are characterized in that: 163mm 12000 mm.

Example 3

In this example, the raw materials are characterized in that: 165mm 12000 mm.

Example 4

The difference between this example and example 1 is that in the pre-finish rolling step, the pre-finish rolling mill and pass system D used is shown in table 4 below:

TABLE 4 PRE-FINISHING MILL AND HOLE SYSTEM D

In this example, the raw material characteristics were the same as in example 1.

Comparative example 1

The difference from example 1 is that the type of the hole and the pass parameter in the pre-finish rolling process are shown in Table 4, the rolling speed of finish No6 in the finish rolling process is 35m/s, and the pass system E in the finish rolling process is shown in Table 5, as follows:

TABLE 5 finishing Mill and pass System E

The wire rods produced in examples 1-4 and the wire rod produced in comparative example 1 were subjected to statistics of size and number of end turns, and the results are shown in table 6.

TABLE 6 rolled piece size statistics 1

The combination of table 6 shows that the 12 mm-sized wire rods produced by the rolling method provided by the invention all meet the B-level precision specified in national standard of GB/T14981-2009 hot-rolled wire rod size, outside line, weight and tolerance, and the number of end-removing turns of the 12 mm-sized wire rods produced from the three raw materials with different characteristics is less than 5 turns, which indicates that the rolling method provided by the invention has good stability, can be adapted to rolling various raw materials into 12mm wire rods, and the obtained wire rods have good quality uniformity; although the 12 mm-sized wire rod produced by the comparative example 1 meets the B-level precision specified by the national standard GB/T14981-2009 hot-rolled wire rod size, outside line, weight and allowable deviation, the out-of-roundness exceeds 0.4mm, the finished product size control is poor, the defects of head and tail ears are more, the head and tail trimming is more than 6 circles, and the 12 mm-sized wire rod produced by the method of the comparative example 1 is more wasted.

Example 5

A rolling method of a wire rod with the specification of 9mm comprises a rough rolling procedure, a pre-finish rolling procedure and a finish rolling procedure;

in this example, the raw material characteristics were the same as in example 1;

wherein, the rough rolling procedure adopts 14 passes of rolling, and is the same as the example 1;

the pre-finish rolling procedure adopts 4 passes of rolling, and is the same as the example 1;

the finish rolling procedure adopted 8 passes of rolling, wherein the pass systems F used in the 19 th to 22 th passes of rolling are shown in Table 7 as follows, which are the same as those used in example 1 and the 23 th to 26 th passes of rolling:

TABLE 7 finishing Mill and pass System F

Example 6

A rolling method of a wire rod with the specification of 11mm comprises a rough rolling procedure, a pre-finish rolling procedure and a finish rolling procedure;

the finish rolling process was carried out in the same manner as in example 1, using 6 passes of rolling.

Example 7

A rolling method of a 14 mm-specification wire rod comprises a rough rolling procedure, a pre-finish rolling procedure and a finish rolling procedure;

the finish rolling step was carried out in 4 passes, and the same procedures as in example 1 were carried out in 19 th to 22 th passes.

The wire rods produced from the wire rods produced in examples 1 and 5-7 were subjected to size and number of end turns statistics and the results are shown in Table 8.

TABLE 8 rolled piece size statistics 2

In combination with table 8, it can be seen that in the rolling process of 9 mm-sized wire rods, 11 mm-sized wire rods and 12 mm-sized wire rods, under the condition that the 1 st to 14 th pass, the 15 th to 18 th pass and the 19 th to 22 th pass are common, the 9 mm-sized wire rods produced respectively meet the accuracy requirement of GB/T14981-grade 2009B, the 11 mm-sized wire rods meet the accuracy requirement of GB/T14981-grade 2009B and the 12 mm-sized wire rods meet the accuracy requirement of GB/T14981-grade 2009B; in the rolling process of the 14 mm-specification wire rod, under the general conditions of the 1 st to 14 th pass, the 15 th to 18 th pass and the 19 th to 22 th pass, the produced 14 mm-specification wire rod meets the requirement of GB/T14981-grade 2009B precision; therefore, the 12 mm-specification wire rod rolling method provided by the invention has the advantage of strong universality, avoids the defect that a hole type system needs to be matched independently in the prior art, and effectively reduces the production cost; in addition, the number of the head and tail removing circles of the wire rod with the specification of 9mm, the wire rod with the specification of 11mm, the wire rod with the specification of 12mm and the wire rod with the specification of 14mm can be counted, and compared with the prior art (the head and the tail need to be trimmed for 8-9 circles) under the condition that the rolling process is universal, the number of the head and the tail removing circles is less, and the economic benefit is effectively improved.

The hourly output of the embodiments 1 to 3 is counted, and the output is increased from 100 tons per hour to more than 110 tons, so that the hourly output is effectively increased; in addition, the number of the finished products of the head and the tail ears is reduced to be within 3 circles from the original 8-9 circles, and the yield is improved by 0.6%.

In the above examples and comparative examples, the models and performance parameters of the roughing mill, the prefinishing mill and the finishing mill used are shown in Table 9 below.

TABLE 9 model information of roughing mill, pre-finishing mill, and finishing mill

Although the present invention has been described in detail by referring to the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A12 mm specification wire rod rolling method is characterized by mainly comprising the following steps: in the finish rolling procedure, 6-pass finish rolling and a hole type system C matched with the 6-pass finish rolling are adopted;

2. The rolling method of a 12 mm-sized wire rod according to claim 1, wherein in the finish rolling process, the finish rolling mill has 10 stands numbered as finish No1, finish No2, finish No3, finish No4, finish No5, finish No6, finish No7, finish No8, finish No9, finish No 10; the 6-pass rolling is carried out by using refined No3, refined No4, refined No5, refined No6, refined No7 and refined No8 in sequence.

3. The method of rolling a 12 mm-sized wire rod according to claim 2, wherein the rolling speed of finish No8 in the finish rolling step is 40 m/s.

4. The rolling method of a 12 mm-gauge wire rod according to claim 2, further comprising a rough rolling process and a pre-finish rolling process.

5. The method for rolling a 12 mm-gauge wire rod according to claim 4, wherein the rough rolling process uses 14-pass rough rolling and the pre-finish rolling process uses 4-pass pre-finish rolling.

6. The method for rolling the 12 mm-sized wire rod according to claim 5, wherein in the rough rolling process, the hole pattern system matched with the rough rolling mill is a hole pattern system A, the hole pattern numbers in the hole pattern system A are 1#, 2#, 3#, 4#, 5#, 6#, 7#, 8#, 9#, 10#, 11#, 12#, 13#, and 14#, and the hole pattern parameters are respectively:

The parameter of the elliptical hole pattern with the hole model number of 13# is R ═ 41.3mm, b_k＝49.14mm，h＝23mm；

The round hole type parameter of the hole type 14# is that R is 15.5mm, b_k＝32.9mm，h＝31mm，α＝30°。

7. The method for rolling a 12 mm-sized wire rod according to claim 5, wherein in the pre-finishing rolling process, the pass system matched with the pre-finishing rolling mill is a pass system B, the pass numbers in the pass system B are E15-03, R16-03, E17-03 and R18-03 in sequence, and the pass parameters are respectively as follows:

8. The rolling method of a 12 mm-sized wire rod according to claim 4, wherein in the rough rolling process, the rolling mill name of rough No1-No6 is phi 610 rolling mill, the rolling mill name of rough No 7-rough No12 is phi 430 rolling mill, and the rolling mill name of rough No 13-rough No14 is phi 370 rolling mill; in the pre-finish rolling procedure, the name of the rolling mill of pre-finish No 1-pre-finish No4 is phi 285 cantilever rolling mill; in the finish rolling process, the rolling mill name of finish No 1-finish No10 is a Mogan 5 generation top cross 45 degree rolling mill.