WO2016004682A1

WO2016004682A1 - Continuous casting machine sector section for deep pressing of continuous casting blank solidification tail end and deep pressing method for continuous casting blank solidification tail end

Info

Publication number: WO2016004682A1
Application number: PCT/CN2014/087369
Authority: WO
Inventors: 康永林; 王新华; 朱国明; 麻晗; 马建超; 曲锦波; 宇航; 张志军; 姜敏; 许志刚
Original assignee: 北京科技大学
Priority date: 2014-07-09
Filing date: 2014-09-25
Publication date: 2016-01-14
Also published as: CN104057049A; EP3167974A1; EP3167974B1; EP3167974A4; US20170113266A1; JP6541043B2; CN104057049B; JP2017532202A; EP3167974B8; KR20170021872A

Abstract

A continuous casting machine sector section for deep pressing of a continuous casting blank solidification tail end. The continuous casting machine sector section comprises an upper frame (2), a lower frame (7), an upper driving roller (3), a lower driving roller (5), a left driven roller set (8), a right driven roller set (9), a pressing apparatus (1), and a clamping cylinder (1) that are all disposed on the sector section. The clamping cylinder is used for clamping the upper frame and the lower frame to be kept in a certain set distance. The upper driving roller is connected to the pressing apparatus. The upper driving roller is connected to the upper frame by means of a bearing base (4). The lower driving roller is connected to the lower frame by means of a bearing base (6). The left driven roller set and the right driven roller set are located on two sides of the driving rollers respectively. The left driven roller set is used for clamping a casting blank before pressing. The right driven roller set is used for clamping the casting blank after pressing. The ratio of the diameter of each driving roller to the diameter of each driven roller is 1.1:1 to 2:1. Also disclosed is a deep pressing method for the continuous casting blank solidification tail end. The continuous casting machine sector section and the deep pressing method for the continuous casting blank solidification tail end improve the deformation permeability of the continuous casting blank and help to alleviate the loosening and segregation in a central area.

Description

Continuous casting machine segment with large solidification end of continuous casting billet and its large pressing method

Technical field

The invention relates to the technical field of slab casting, in particular to a continuous casting machine segment of a continuous casting billet having a large solidification end and a large pressing method thereof.

Background technique

The large-pressing technology of the solidification end of continuous casting slab is to set the pressing roller on the solidification end of the continuous casting slab in the continuous casting production line. When the solid phase ratio of the casting blank reaches 80% or more, the casting blank is subjected to large reduction deformation ( 5 to 20 mm), followed by normal rolling production. This technology can significantly improve the center quality of continuous casting slab (improve low-fold structure, shrinkage, porosity, segregation, etc.), and can produce high-quality thicker than 100mm at a lower compression ratio (1.5~2.5). Thick plate products.

When the solidification end of the continuous casting billet is subjected to large pressing, if the fan section of the casting machine is entirely pressed, the contact area of the 5 to 7 pairs of the casting machine rolls simultaneously contacting the casting blank is significantly increased, so that the load is also It will increase significantly, so the strength and rigidity of the segment must be greatly increased to resist the strong load and large elastic deformation of the segment and the segment roller (or the casting machine roller). The segment roller is made of roller ring and core. The shaft and the intermediate support bearing block, which will increase the size and weight of the segment, which will bring a series of new problems such as the lifting and maintenance of the segment, and the large pressing is at the solidification end of the continuous casting blank. In the vicinity, the multiple pairs of rolls of the large reduction segment and the deformation (variable strain) generated by the small deformation are poor in permeability, and the strain transmitted to the central portion of the slab is small, which is not conducive to better improving the central region. Loose and segregation defects.

Therefore, when the soft reduction system of the original continuous casting machine is directly pressed at the end of the solidification end of the segment, there will be a serious shortage of the strength and rigidity of the fan section of the continuous casting machine and the driving roller, and the bearing capacity of the clamping cylinder Insufficient, it is difficult to carry out the problem that the solidification end is greatly pressed, and the intermediate crack of the casting blank is liable to occur.

Summary of the invention

The technical problem to be solved by the present invention is to provide a continuous casting machine fan under the large pressing end of the solidification end of the continuous casting billet The segment and its large pressing method are used to solve the problem that the strength and rigidity of the fan-shaped section of the continuous casting machine and the driving roller are seriously insufficient when the original continuous casting machine system is used in the prior art. In addition, there is a problem that the bearing capacity of the clamping cylinder is insufficient, it is difficult to carry out the large pressing of the solidification end, and the intermediate crack of the casting blank is likely to occur.

In order to solve the above technical problem, an embodiment of the present invention provides a continuous casting machine segment of a continuous casting billet having a large solidification end, including an upper frame, a lower frame, an upper driving roller, and a lower driving on the continuous casting machine segment. a roller, a left driven roller set, a right driven roller set, a pressing device, and a clamping cylinder for clamping the upper frame and the lower frame to maintain a set interval; the upper driving roller and the pressing device Connected, the upper driving roller is coupled to the upper frame through an upper bearing housing, and the lower driving roller is coupled to the lower frame through a lower bearing housing, the left driven roller group and the right driven roller group being respectively located at the driving roller On both sides, the left driven roller set is used for clamping the slab before pressing, and the right driven roller set is used for clamping the pressed slab, the diameter of the driving roller and the driven roller The ratio of diameters is from 1.1:1 to 2:1.

Wherein, the opening degree of the right driven roller set and the driving roller is the same as the thickness of the cast slab after pressing.

Wherein, the opening degree of the left driven roller group is the same as the thickness of the casting blank before pressing.

Wherein, the driving roller is a unitary type and is formed by an integral forming process.

In order to solve the above technical problem, the present invention also provides a method for solidification end of a continuous casting billet, comprising the following steps:

(1) The clamping cylinder applies a certain pressure to the upper frame, so that the opening degree of the left driven roller group is the same as the thickness of the casting blank before pressing, and is used for clamping the casting blank before pressing;

(2) setting the reduction amount of 5 to 20 mm, and driving the driving roller to perform large deformation deformation by the pressing device;

(3) The right driven roller set is adjusted so that the opening degree thereof is the same as the distance between the upper and lower driving rollers, and is used for clamping the cast slab after being pressed.

In the above solution, the invention adopts a large roller diameter integral driving roller and an upper frame, a lower frame with high strength and high rigidity, and a clamping cylinder with a large carrying capacity; the total deformation amount under large pressing is driven by a large roller diameter. The roller performs large reduction deformation on the continuous casting billet, instead of 5 to 7 pairs of the casting machine rolls, which are usually deformed one by one to complete the total deformation amount under large pressure.

The beneficial effects of the above technical solution of the present invention are as follows:

1. The plastic deformation contact area is reduced, and only the large roller diameter is driven by the whole roller, and the total deformation force is remarkable. Decrease

2. The increased tightening force required for the segment-shaped clamping cylinder is also correspondingly reduced, and the structural material and weight required to maintain the strength and rigidity of the upper and lower segments during large reduction are also reduced;

3. The deformation permeability is increased, which is equivalent to the deformation of one rolling pass of the two-roll mill with larger roll diameter, which is more conducive to the improvement of looseness and segregation in the central region of the continuous casting blank.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a front elevational view of a continuous casting machine segment of a continuous casting billet at a solidified end;

Figure 2 is a side elevational view of the continuous casting machine segment of the continuous casting billet at the solidification end of the embodiment of the present invention;

Fig. 3 is a schematic view showing the principle of the large reduction method of the segment of the continuous casting machine under the large solidification end of the continuous casting slab according to the embodiment of the present invention.

[Main component symbol description]

1: depressing the device;

2: upper frame;

3: upper drive roller;

4: upper bearing seat;

5: lower drive roller;

6: lower bearing seat;

7: the lower frame;

8: left driven roller set;

9: right driven roller set;

10: clamping cylinder;

11: Transmission.

detailed description

The technical problems, the technical solutions, and the advantages of the present invention will be more clearly described in the following description.

The invention is directed to the prior art, in the soft reduction system using the original continuous casting machine, when the solidification end of the segment is pressed, the strength and rigidity of the fan-shaped section of the continuous casting machine and the driving roller are seriously insufficient, and In the case that the bearing capacity of the clamping cylinder is insufficient, it is difficult to carry out the large pressing of the solidification end, and the intermediate crack of the casting blank is prone to occur, and a continuous casting machine segment and a large pressing method for the continuous solidification end of the continuous casting billet are provided.

As shown in FIG. 1 and FIG. 2, a continuous casting machine segment of a continuous casting billet having a large solidification end is provided, comprising an upper frame 2 and a lower frame 7 on a continuous casting machine segment. Upper drive roller 3, lower drive roller 5, left driven roller set 8, right driven roller set 9, depressing device 1 and clamping cylinder 10 for clamping upper frame 2 and lower frame 7 maintaining the set interval, the driving roller and the driven roller are rotated by the transmission device 11 to drive the casting blank forward; the upper driving roller 3 is connected to the pressing device 1, and the upper driving roller 3 passes The upper bearing block 4 is coupled to the upper frame 2, and the lower drive roller 5 is coupled to the lower frame 7 via the lower bearing block 6, the left driven roller set 8 and the right driven roller set 9 being respectively located at the drive roller On the side, the left driven roller set 8 is used for clamping the slab before pressing, and the right driven roller set 9 is used for clamping the pressed slab, the diameter of the driving roller and the driven roller The ratio of diameters is from 1.1:1 to 2:1.

The opening degree of the right driven roller group 9 and the driving roller is the same as the thickness of the cast slab after the pressing. The opening degree of the left driven roller group 8 is the same as the thickness of the slab before the pressing. The driving roller is of a unitary type and is formed by an integral forming process.

As shown in FIG. 3, the present invention also provides a method for solidifying the solidification end of a continuous casting billet, comprising the following steps:

(1) The clamping cylinder applies a certain pressure to the upper frame 2, so that the opening degree of the left driven roller group 8 is the same as the thickness of the casting blank before pressing, and is used for clamping the casting blank before pressing;

(2) setting the reduction amount of 5 to 20 mm, and driving the driving roller to perform large deformation deformation by the pressing device 1;

(3) The right driven roller group 9 is adjusted so that the opening degree thereof is the same as the distance between the upper and lower driving rollers, and is used for clamping the cast slab after being pressed. This makes it possible to carry out the press-down deformation only by the large-diameter integrated drive roller 3, and the right-side driven roller 9 on the outlet side does not bear the deformation of the press, which is similar to the rolling deformation of the cast strand by the two-roll mill.

The driving roller of the present invention is a large roller diameter integral driving roller (ie, a sectional roller which is not composed of a roller ring, a mandrel and an intermediate supporting bearing seat), and considers an increase in load when a large pressing is performed, and the segment is improved. The strength and rigidity of the upper frame 2 and the lower frame 7 (the amount of increase is 2 to 5 times), and the bearing capacity of the four clamping cylinders 10 is increased correspondingly (the amount of increase is 2 to 5 times).

1. The plastic deformation contact area is reduced, and only the large roller diameter is driven by the overall roller, and the total deformation force is significantly reduced;

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It should also be considered as the scope of protection of the present invention.

Claims

A continuous casting machine segment of a continuous casting billet having a large solidification end, comprising an upper frame, a lower frame, an upper driving roller, a lower driving roller, a left driven roller group, and a right driven roller on a continuous casting machine segment a set, a pressing device, and a clamping cylinder, wherein the clamping cylinder is used to clamp the upper frame and the lower frame to maintain a set interval; the upper driving roller is connected to the pressing device, and the upper driving roller passes The upper bearing seat is coupled to the upper frame, and the lower driving roller is coupled to the lower frame by a lower bearing seat, the left driven roller set and the right driven roller set are respectively located at two sides of the driving roller, the left driven The roller set is used for clamping the slab before pressing, and the right driven roller set is used for clamping the slab after pressing, and the ratio of the diameter of the driving roller to the diameter of the driven roller is 1.1:1. 2:1.
The continuous casting machine segment of the continuous casting slab according to claim 1, wherein the right driven roller group and the driving roller have the same opening degree as the slab thickness after the pressing.
The continuous casting machine segment of the continuous casting slab according to claim 2, wherein the left driven roller group has the same opening degree as the slab before pressing.
The continuous casting machine segment of the continuous casting slab according to claim 3, wherein the driving roller is of a unitary type and is formed by an integral forming process.
A method for solidification end solidification of a continuous casting billet, characterized in that the method comprises the following steps:

(1) The clamping cylinder applies a certain pressure to the upper frame, so that the opening degree of the left driven roller group is the same as the thickness of the casting blank before pressing, and is used for clamping the casting blank before pressing;

(2) setting the reduction amount of 5 to 20 mm, and driving the driving roller to perform large deformation deformation by the pressing device;

(3) The right driven roller set is adjusted so that the opening degree thereof is the same as the distance between the upper and lower driving rollers, and is used for clamping the cast slab after being pressed.