阅读说明：本技术 一种万能轧机生产高精度阴极扁钢的方法 (Method for producing high-precision cathode flat steel by universal rolling mill ) 是由 *** 黄玮钢 于 2019-02-25 设计创作，主要内容包括：本发明公开了一种万能轧机生产高精度阴极扁钢的方法,包括以下步骤：首先根据成品尺寸,按照3倍压缩比选择合适尺寸的坯料进行加热,通过辊道输送至粗轧机组进行轧制,再进入立轧轧边机、平轧轧角机和四辊万能轧机精准定型轧制,产品尺寸精度能达到0.3mm；本发明方法能够克服原来二辊轧机生产阴极扁钢成品孔槽口两侧无法加工和对导卫要求较高的缺点,为阴极扁钢的生产开辟一条全新的思路。(The invention discloses a method for producing high-precision cathode flat steel by a universal rolling mill, which comprises the following steps: firstly, selecting a blank with a proper size according to the size of a finished product and a compression ratio of 3 times, heating, conveying the blank to a rough rolling unit through a roller way for rolling, and then accurately sizing and rolling the blank in a vertical edger, a flat angle rolling machine and a four-roller universal mill, wherein the size precision of the product can reach 0.3 mm; the method can overcome the defects that the two sides of the slot opening of the finished cathode flat steel product produced by the original two-roller mill cannot be processed and the requirement on guide and guard is high, and opens up a brand new idea for the production of the cathode flat steel.)

1. A method for producing high-precision cathode flat steel by a universal mill is characterized by comprising the following steps: firstly, selecting a blank with a proper size according to the size of a finished product and a compression ratio of 3 times, heating, conveying the blank to a rough rolling unit through a roller way for rolling, and then accurately sizing and rolling the blank in a vertical edger, a flat angle rolling machine and a four-roller universal mill, wherein the size precision of the product can reach 0.3 mm;

the vertical edging mill is a vertical two-roller mill and mainly used for correcting the skew of a rolled piece; the flat rolling angle rolling machine is a horizontal two-roller rolling machine and is mainly used for rolling four R fillets to ensure that the finished product obtains the R fillets with satisfactory sizes; the four-roller universal rolling mill is characterized in that a hole pattern is formed by an upper horizontal roller, a lower horizontal roller, a left vertical roller and a right vertical roller, wherein the upper horizontal roller and the lower horizontal roller are driving rollers, the left vertical roller and the right vertical roller are driven rollers, the upper horizontal roller and the lower horizontal roller of the universal rolling mill are firstly engaged with a rolled piece and then drive the rolled piece to pass through the unpowered left vertical roller and the unpowered right vertical roller; the arrangement form of the rolling mill can adopt full continuous rolling and semi-continuous rolling, and the roughing mill set adopts a continuous rolling mill set and a finishing mill set to form full continuous rolling; the roughing mill adopts a three-roller mill or a two-roller reversible mill to finish cogging rolling, and then the cogging rolling is conveyed to a finish rolling 3 frames for continuous rolling through a roller way to form semi-continuous rolling.

Technical Field

The invention relates to a method for producing high-precision cathode flat steel by a universal rolling mill.

Background

The cathode flat steel used in the electrolytic aluminum production plant is generally rolled by a two-roller rolling mill in domestic section bar manufacturers, and in order to meet the requirement of 3-time compression ratio of the cathode flat steel, the section bar manufacturers generally finish the rolling production of the cathode flat steel by 4-6 times of large rolling reduction of large-section blanks. The finished product has an oblique square shape and a trapezoidal or rhombic section when the guide and guard supporting effect is poor in the production process; in addition, two rolling mills only process two surfaces each time, and two side surfaces of a finished hole type notch can generate certain convexity according to different rolling reduction, and are generally in a single drum shape or a double drum shape. When the cathode flat steel is used as an electrode in an electrolytic aluminum plant, the contact area between the cathode flat steel and the plane in the electrode tank is less than 70 percent, so that the power consumption of the electrolytic aluminum plant is increased, and the cost is increased.

At present, the requirement of various domestic large electrolytic aluminum plants on the control of production cost is continuously improved, the dimensional precision of cathode flat steel is required to be continuously improved, the machining precision of a domestic currently adopted two-roller mill cannot meet the requirement of the electrolytic aluminum plants on the dimensional precision of the cathode flat steel, and the yield and the machining cost of a section processing plant are greatly influenced.

Disclosure of Invention

In view of the above, the invention aims to provide a method for producing high-precision cathode flat steel by using a universal rolling mill, which can overcome the defects that the two sides of the notch of the finished cathode flat steel product hole produced by using the original two-roller rolling mill cannot be processed and the requirement on guide and guard is high, and opens up a brand new idea for the production of the cathode flat steel.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method for producing high-precision cathode flat steel by a universal mill comprises the following steps:

1) firstly, selecting a blank with a proper size according to the size of a finished product and a compression ratio of 3 times, heating, conveying the blank to a rough rolling unit through a roller way for rolling, and then accurately sizing and rolling the blank in a vertical edger, a flat angle rolling machine and a four-roller universal mill, wherein the size precision of the product can reach 0.3 mm;

2) the vertical edging mill is a vertical two-roller mill and mainly used for correcting the skew of a rolled piece;

3) the flat rolling angle rolling machine is a horizontal two-roller rolling machine and is mainly used for rolling four R fillets to ensure that the finished product obtains the R fillets with satisfactory sizes;

4) the four-roller universal rolling mill is characterized in that a hole pattern is formed by an upper horizontal roller, a lower horizontal roller, a left vertical roller and a right vertical roller, wherein the upper horizontal roller and the lower horizontal roller are driving rollers, the left vertical roller and the right vertical roller are driven rollers, the upper horizontal roller and the lower horizontal roller of the universal rolling mill are firstly engaged with a rolled piece and then drive the rolled piece to pass through the unpowered left vertical roller and the unpowered right vertical roller;

5) the arrangement form of the rolling mill can adopt full continuous rolling and semi-continuous rolling, and the roughing mill set adopts a continuous rolling mill set and a finishing mill set to form full continuous rolling; the roughing mill adopts a three-roller mill or a two-roller reversible mill to finish cogging rolling, and then the cogging rolling is conveyed to a finish rolling 3 frames for continuous rolling through a roller way to form semi-continuous rolling.

The invention can process four surfaces of the rolling mill at the same time in the pass of the finished product after field verification, and the dimensional precision of the finished product reaches the precision of 0.3mm required by electrolytic aluminum factories. The invention can overcome the defects that the two sides of the slot opening of the finished cathode flat steel product produced by the original two-roller mill cannot be processed and the requirement on guide and guard is high, and opens up a brand new idea for the production of the cathode flat steel.

Drawings

The present invention will be described in further detail below with reference to the accompanying drawings.

FIG. 1 is a layout of a rolling mill used in the present invention.

The specific implementation mode is as follows:

a method for producing high-precision cathode flat steel by a universal mill comprises the following steps:

1) the blank size must be more than 3 times larger than the finished size.

2) The rough rolling mill adopts a box-shaped hole to roll for 4-6 times, the width of the finished red bar of the rough rolling mill is 10mm larger than the size of the finished product, and the height of the finished red bar is 5mm larger than the size of the finished product. And (5) sending the rolled piece into a finish rolling triple tandem rolling for rolling.

3) In order to facilitate the groove removal of rolled pieces, the groove depth of an edge rolling machine and an angle rolling machine for the last rough rolling pass and the finish rolling pass is 30mm, and the inclination of the side wall is 8 degrees.

4) The reduction of the finish rolling edger is 6mm, so that the bias can be eliminated to the minimum;

5) the rolling reduction of the finish rolling angle rolling machine in the height direction is 2mm, and the radius of an R fillet is 18 mm;

6) and (3) finishing the finish rolling of the finished product by respectively setting the rolling reduction of the secondary horizontal roller and the vertical roller to be 2mm, finishing the shaping rolling of the finished product, simultaneously deforming four surfaces of a rolled piece, and extruding an R fillet of 18mm of the incoming material of the angle rolling machine to be within 15 mm.

The rolling unit adopted by the method of the invention is arranged according to the figure 1, namely a rough rolling mill 1, a finish rolling edger 2, a finish rolling angle rolling mill 3 and a finish rolling shaping four-roller universal rolling mill 4. Firstly, a blank with a proper size is selected according to the size of a finished product and a compression ratio of 3 times to be heated, the blank is conveyed to a rough rolling unit through a roller way to be rolled, and then the blank is precisely shaped and rolled by a vertical edger, a flat angle rolling machine and a four-roller universal mill, wherein the size precision of the product can reach 0.3 mm.