阅读说明：本技术 一种一个孔型系统实现多断面型钢共线轧制的方法 (Method for realizing collinear rolling of multi-section steel by using hole pattern system ) 是由 肖洋 王刚 张世宇 王海峰 于 2018-06-12 设计创作，主要内容包括：本发明公开一种一个孔型系统实现多断面型钢共线轧制的方法,在棒材生产线上实现直径为150mm圆钢与边长为115mm方钢共线轧制；其孔型排列依次为箱型孔、箱型孔、箱型孔、椭圆孔、过渡孔、椭圆孔、最后成品圆孔轧制直径为150mm圆钢；孔型排列为箱型孔、箱型孔、箱型孔、椭圆孔、过渡孔、椭圆孔、成品圆孔、菱形孔、最后成品方孔轧制边长为115mm方钢。本发明的优点是：本发明适合应用于方钢与圆钢的轧制生产,可以实现一条孔型系统共线轧制方钢与圆钢产品,机架配置由箱型、椭圆孔机架和圆孔机架组成,后连接有菱形以及方孔机架。此生产方式可以有效提高轧辊的利用率,降低轧辊消耗,减少轧机更换次数,降低成本,降低操作难度,降低钢材缺陷比率。(The invention discloses a method for realizing collinear rolling of multi-section steel by using a pass system, which is used for realizing collinear rolling of round steel with the diameter of 150mm and square steel with the side length of 115mm on a bar production line; the hole patterns are sequentially arranged into a box-shaped hole, an elliptical hole, a transition hole, an elliptical hole and a finished round hole, and the round steel with the diameter of 150mm is rolled; the hole patterns are arranged into box holes, elliptical holes, transition holes, elliptical holes, finished round holes, rhombic holes and finally finished square holes, and the side length of the rolled square steel is 115 mm. The invention has the advantages that: the invention is suitable for rolling production of square steel and round steel, can realize collinear rolling of square steel and round steel products by a pass system, and is characterized in that the rack configuration comprises a box type, an elliptical hole rack and a round hole rack, and the rear part of the rack is connected with a diamond type and a square hole rack. The production mode can effectively improve the utilization rate of the roller, reduce the consumption of the roller, reduce the replacement times of the rolling mill, reduce the cost, reduce the operation difficulty and reduce the defect rate of steel products.)

1. A method for realizing collinear rolling of multi-section steel by using a pass system is characterized by comprising the following steps of: the collinear rolling of round steel with the diameter of 150mm and square steel with the side length of 115mm is realized on a bar production line; the hole patterns are sequentially arranged into a box-shaped hole, an elliptical hole, a transition hole, an elliptical hole and a finished round hole, and the round steel with the diameter of 150mm is rolled; the hole patterns are arranged into box holes, elliptical holes, transition holes, elliptical holes, finished round holes, rhombic holes and finally finished square holes, and the side length of the rolled square steel is 115 mm.

2. The method for realizing the collinear rolling of the multi-section steel by using the hole pattern system as claimed in claim 1, wherein the method comprises the following steps: when the round rolled piece enters the large round rhombic hole, the elongation coefficient is within the range of 1.22-1.350, and meanwhile, the diameter of the round rolled piece is ensured to be within the range of 150mm-155mm, so that the round rolled piece is ensured to be formed in the large round rhombic hole.

3. The method for realizing the collinear rolling of the multi-section steel by using the hole pattern system as claimed in claim 1, wherein the method comprises the following steps: the theoretical basis of the design of the hole pattern of the diamond hole and the square hole of the final finished product rolled square steel with the side length of 115mm is the Wusatoski formula.

Technical Field

The invention relates to a metallurgical technology, in particular to a steel rolling method.

Background

The pass system for producing square steel (sharp-corner square steel and round-corner square steel) takes a box pass as a rough rolling pass, and a finish rolling pass is generally a box pass system, an oval-square pass system, a diamond-diamond pass system and the like. The existing 800 reversible blooming mill can be used for rolling square steel, box type hole cogging and square hole forming. Or the square steel can be rolled on a continuous rolling mill by taking square steel as a raw material through a hole pattern system which is alternately distributed.

The round steel production hole type system mainly comprises a box type hole-square hole-elliptical hole-circular hole system, or an elliptical hole-circular hole-elliptical hole-circular hole system and the like. No matter what hole type system is adopted, the finished hole type is always a round hole type.

The conventional square steel is designed with hole type systems such as a box-shaped hole, a diamond-shaped hole and a square hole, and hole type systems such as an elliptical hole, a diamond-shaped hole and a square hole, wherein the hole type systems have the defects of more new hole types, high cost, more replacement of a rolling mill, high difficulty in controlling section sizes, high operation difficulty and the like for the conventional 800 round steel production line, and meanwhile, the problem of surface quality such as serious corner folding exists. Therefore, in order to lower the cost of producing square steel, simplify the operation and improve the rolling quality, the most reasonable pass design needs to be made by combining the existing 800 round steel production line.

Disclosure of Invention

In order to solve the technical problems, the invention aims to modify the existing round steel rolling production line and produce square steel products. The specific technical scheme is as follows: when a continuous mill rolls round steel and square steel, the round steel with the diameter of 150mm and the square steel with the side length of 115mm are rolled in a collinear way on a bar production line; the hole patterns are sequentially arranged into a box-shaped hole, an elliptical hole, a transition hole, an elliptical hole and a finished round hole, and the round steel with the diameter of 150mm is rolled; the hole patterns are arranged into box holes, elliptical holes, transition holes, elliptical holes, finished round holes, rhombic holes and finally finished square holes, and the side length of the rolled square steel is 115 mm.

When the round rolled piece enters the large round rhombic hole, the elongation coefficient is within the range of 1.22-1.350, and meanwhile, the diameter of the round rolled piece is ensured to be within the range of 150mm-155mm, so that the round rolled piece is ensured to be formed in the large round rhombic hole.

The theoretical basis of the design of the hole pattern of the diamond hole and the square hole of the final finished product rolled square steel with the side length of 115mm is the Wusatoski formula.

The invention has the advantages that:

the invention is suitable for rolling production of square steel and round steel, can realize collinear rolling of square steel and round steel products by a pass system, and is characterized in that the rack configuration comprises a box type, an elliptical hole rack and a round hole rack, and the rear part of the rack is connected with a diamond type and a square hole rack. The production mode can effectively improve the utilization rate of the roller, reduce the consumption of the roller, reduce the replacement times of the rolling mill, reduce the cost, reduce the operation difficulty and reduce the defect rate of steel products.

Detailed Description

The present invention is specifically illustrated by the following examples;

the invention successfully rolls the phi 150mm round steel and the square steel with the side length of 115mm in a trial rolling way on the 800 round steel production line in a collinear way, has the dimension qualification rate of 100 percent and completely meets the requirements of GB/T702-2008 on the dimension and the allowable deviation of the square steel in the round steel and GIB 1492-2005. Only two rolling mills need to be replaced in the production process, the operation time is averagely saved by 5 hours, and simultaneously, rolled steel has good surface quality and no defects of folding and the like at corners.

The technical scheme of the invention is elaborated by taking a collinear hole type system of round steel with the diameter of 150mm and square steel with the side length of 115mm as an example. The size of the round steel with the diameter of 150mm meets GB/T702-2008I group (+/-1.2 mm), and the size of the square steel with the side length of 115mm meets GIB1492-2005 shown in Table 1.

TABLE 1 specification of the section size of a square steel with side lengths of 115mm

The existing production process of an 800 round steel continuous rolling production line is used for producing round-section steel by a hole pattern arrangement, namely a box-type hole-elliptical hole-circle-elliptical hole-circular hole pattern system. The design of the square steel hole system with the side length of 115mm is calculated and designed on the basis of a rack group consisting of an original elliptical hole rack and a round hole rack, and the square steel is rolled and produced by adopting round steel produced by a rolling line as incoming materials, large-circular-corner diamond holes and square hole transition holes.

When the round rolled piece enters the large round rhombic hole, the elongation coefficient is within the range of 1.22-1.350, and meanwhile, the diameter of the round rolled piece is required to be within the range of 150mm-155mm, so that the round rolled piece can be ensured to be formed in the large round rhombic hole. Therefore, the rolling of the square steel with the side length of 115mm can be realized by collinear rolling with phi 150mm round steel, a large-fillet diamond hole and a square hole are newly designed, the square hole is connected after a phi 150mm round steel hole pattern system is rolled, and the finished hole pattern of the phi 150mm round steel is used as a first third hole of the square steel with the side length of 115 mm.

BOX1-1(V1 BOX-shaped hole) -BOX 2-1(H2 BOX-shaped hole) -BOX 3-2(V3 BOX-shaped hole) -ODR 4-1(H4 oval hole) -FR 5-1(V5 transition hole) -ODR 6-1(H6 oval hole) -FR 7-2(V7 phi 150 finished round hole) -RH 8-1(H8 diamond hole) -FF 9-1(V9 □ 115 finished square hole).

The 8 th (RH8-1) and 9 th (FF9-1) hole type designs can be designed according to the section size specification of the GIB1492-2005 square steel, and the design is shown in Table 1. According to the Wusatowski formula: δ w0.566 roll diameter, δ w pass shape, and K ═ K (K temperature, K speed, K roll, K material). The delta w of the round rolled piece in the square hole is 1.012-1.013, and the delta w of the square rolled piece in the square hole is 1.00-1.011. And designing the hole pattern according to the two conditions.

According to the principle that the second flow of each pass of continuous rolling is equal, when a rolling program table is prepared, relevant parameters in the rolling program table of the round steel with the diameter of 150mm can be directly utilized to carry out parameter calculation according to the cascade control characteristics of the continuous rolling. The rolling program of round steel with the diameter of 150mm and square steel with the side length of 115mm is shown in a table 2. V1-V7 roll round steel with the diameter of 150mm, and V1-V9 roll square steel with the side length of 115 mm.

TABLE 2 schedule of rolling schedule for round steel with 150mm diameter and square steel with □ 115mm diameter