CN114054700B - Round billet pressing method and device - Google Patents

Abstract

The application discloses a method and a device for pressing round billets, wherein the method comprises the following steps: the method comprises the following steps that (1) first withdrawal and straightening machines and second withdrawal and straightening machines are alternately arranged, wherein each first withdrawal and straightening machine comprises a pair of first press rolls which are oppositely arranged, each second withdrawal and straightening machine comprises a pair of second press rolls which are oppositely arranged, and the directions of the first press rolls and the second press rolls are mutually vertical; determining target rolling reduction R corresponding to the first rolling reduction roller and the second rolling reduction roller; and controlling the first press-lower roller and the second press-lower roller to perform pressing operation on the round billet according to the target pressing amount R. The method solves the problems that the circular blank pressing efficiency is low and cracks are easy to generate in the prior art.

Description

Round billet pressing method and device

technical field

The present application relates to the technical field of continuous casting technology, in particular to a round billet pressing method and device.

Background technique

In the existing continuous casting process, the traditional square billet and slab reduction scheme is applied to the round billet, the reduction efficiency of the round billet is very low, and it may also cause cracks on the surface and inside of the round billet, and cause round billet ovality The increase will lead to unqualified round billet products.

At present, there are few studies on round billet reduction at home and abroad. Some scholars have studied the round billet soft reduction process. According to the following process, it is concluded that the round billet is not suitable for the implementation of the reduction process; MCC Saidi Li Wanguo and others proposed a new roll row design that takes into account the light reduction technology of the bloom and round billet continuous casting machines, to a certain extent It solves the problem of whether the tension leveler is grooved or not. LiLiang et al. proposed a single-direction, multi-pass extrusion round billet reduction method using straight rollers, which alleviated the problem of increased ellipticity during round billet reduction.

Patent CN109622905B proposes a high-order polynomial curve convex roll design method for bloom continuous casting and straightening machines. The high-order polynomial method is used to design the convex roll shape suitable for bloom continuous casting and straightening machines, which can effectively control continuous The continuous casting quality of cast blooms, and the smooth curve transition can effectively avoid surface cracks caused by stress concentration. This design method for pressing convex rolls is suitable for continuous casting blooms, but not for continuous casting round billets.

Patent CN106735026B proposes a single-point and continuous heavy reduction process at the solidification end of continuous casting slab. In the fan-shaped section, set the reduction roller with a large reduction amount to achieve the effect of transferring the strain to the core of the billet; in the fan-shaped section, use a continuous reduction roller with a small reduction amount to carry out continuous billet compaction to ensure that the casting The billet does not rebound after being pressed, which further ensures the pressing effect. This scheme is applicable to square billets and slabs. If it is used on continuous casting round billets, the problem of increased ellipticity of round billets cannot be avoided.

Patent CN107008874B proposes a method for controlling the solidification end of the continuous casting slab in the unsteady state casting process, which solves the problem of the continuous casting slab solidification end under heavy pressure in the unsteady state casting process, and realizes the control method in the unsteady state The solidification end heavy reduction effect during the casting process, but this patent does not involve the round billet reduction scheme.

Patent CN104001891B provides an on-line control method for billets under dynamic light reduction and heavy reduction. The method described in the scheme is suitable for billets, not for round billets. And this scheme adopts straight roll, the continuous casting slab extrusion method of up and down single direction, is not suitable for round slab.

Patent CN108067501B proposes a method for designing work roll curves of high-temperature and large-reduction rolling mills for blooms and rectangular billets. The work roll optimizes the combination of the flange roll shape and the box-shaped pass, and optimizes the geometric characteristics of the work roll. The application of this work roll in the rolling process under high temperature and high pressure further improves the deformation of the core of the billet. Three-way compression effect of penetration and central shrinkage cavity. This scheme is suitable for high-temperature blooms and rectangular billets, but not for the shape characteristics of continuous casting round billets. And this scheme is a single-pass rolling, which is not suitable for the continuous casting and pressing process.

Contents of the invention

In view of this, the present application provides a method and device for pressing a round blank. Multiple pairs of arc-shaped pressing rollers are alternately arranged and the direction is vertical, and the round blank is pressed alternately in the up-down direction and left-right direction to obtain a round billet. High-quality products can not only reduce the ovality of the round billet, but also ensure the pressing effect of the round billet.

According to one aspect of the present application, a method for pressing a round billet is provided, comprising:

The first tension-leveler and the second tension-leveler are arranged alternately, wherein each of the first tension-leveler includes a pair of oppositely arranged first pressing rolls, and each of the second tension-leveler includes a pair of opposite The second pressing roll is set, the direction of the first pressing roll and the second pressing roll are perpendicular to each other, the first target shape parameter of the first pressing roll is the same as the second pressing roll of the second pressing roll The target shape parameters are the same;

determining a target reduction amount R corresponding to the first reduction roller and the second reduction roller;

According to the target reduction amount R, the first pressing roller and the second pressing roller are controlled to perform a pressing operation on the round billet.

Optionally, before controlling the first pressing roller and the second pressing roller to perform the pressing operation, the method further includes:

The first target shape parameter and the second target shape parameter are determined, wherein the first target shape parameter includes a semi-minor axis parameter and a semi-major axis parameter.

Optionally, the determining the target reduction amount R corresponding to the first pressing roller and the second pressing roller specifically includes:

Determining the compaction force corresponding to each of the multiple preset reduction amounts;

Among the compaction forces less than or equal to the safe compaction force, the largest reduction amount is selected as the target reduction amount R.

Optionally, the determining the compaction force corresponding to each reduction amount specifically includes:

Determine the position where the solid phase ratio of the center of the round billet is 1 as the pressing position;

When the pressing operation is performed at the pressing position according to each of the pressing amounts, the green compacting force corresponding to each of the pressing amounts is respectively determined.

Optionally, the determining the first target shape parameter of the first press roll and the second target shape parameter of the second press roll specifically includes:

Obtain the diameter d of the round billet;

According to the diameter d of the round billet and the target reduction R, a first shape parameter is calculated, wherein the first shape parameter includes a first semi-minor axis parameter a and a first semi-major axis parameter b;

Using the diameter of the round blank as the second semi-minor axis parameter and the second semi-major axis parameter of the second shape parameter respectively;

Setting at least one third shape parameter, wherein the third semi-minor axis of the third shape parameter is greater than the first semi-minor axis parameter and smaller than the second semi-minor axis parameter, and the third semi-minor axis parameter of the third shape parameter The third semi-major axis parameter is smaller than the first semi-major axis parameter and greater than the second semi-major axis parameter;

Among the first shape parameter, the second shape parameter and the at least one third shape parameter, the first target shape parameter is selected.

Optionally, the first shape parameter is calculated according to the diameter d of the round blank and the target reduction R, which specifically includes:

a=dR,

Optionally, the selecting the first target shape parameter among the first shape parameter, the second shape parameter and the at least one third shape parameter specifically includes:

determining each of the first shape parameter, the second shape parameter and the third shape parameter as a first shape parameter to be selected;

determining the surface strain value and surface strain concentration of the round billet when the pressing operation is performed with each of the first parameters to be selected;

When the surface strain value is less than the surface strain threshold and the surface strain concentration is less than the concentration threshold, the first parameter to be selected corresponding to the surface strain value is used as the second parameter to be selected;

determining the central strain value of the round billet when the pressing operation is performed with each of the second parameters to be selected;

Comparing the magnitudes of the central strain values, using the second parameter to be selected corresponding to the largest central strain value as the first target shape parameter.

Optionally, the first semi-semi-minor parameter, at least one of the third semi-semi-minor parameters and the second semi-semi-minor parameter have an arithmetic sequence relationship;

The relationship between the first semi-major axis parameter, at least one of the third semi-major axis parameters and the second semi-major axis parameter is an arithmetic sequence relationship;

Wherein, the number of the third shape parameters is two.

Optionally, the alternate arrangement of the first tension leveler and the second tension leveler specifically includes:

Determine the position where the solid phase rate of the center of the round billet is 0.3 as the starting position and the position where the solid phase rate of the center of the round billet is 1 as the end position;

setting one of the first tension leveling machines at the starting position, one of the second tension leveling machines at the end position, and setting the other of the first tension leveling machine and the second tension leveling machine Machines are arranged alternately between said start position and said end position.

According to another aspect of the present application, a round billet pressing device is provided, comprising:

The first tension leveling machine and the second tension leveling machine, wherein, the first tension leveling machine and the second tension leveling machine are arranged alternately, and each of the first tension leveling machines includes a pair of oppositely arranged first presses The lower rolls, each of the second tension levelers includes a pair of second pressing rolls oppositely arranged, the directions of the first pressing rolls and the second pressing rolls are perpendicular to each other, and the first pressing rolls The first target shape parameter is the same as the second target shape parameter of the second press roll;

A determination module, configured to determine a target reduction amount R corresponding to the first reduction roller and the second reduction roller;

The control module is configured to control the first pressing roller and the second pressing roller to perform a pressing operation on the round billet according to the target reduction amount R.

Optionally, the device can realize the above-mentioned pressing method of the round billet.

With the above technical solution, the present application provides a method and device for pressing a round billet, which is suitable for a cylindrical billet. Multiple pairs of arc-shaped pressing rollers are arranged alternately and the direction is vertical, and the round billet is pressed alternately in the up-down direction and left-right direction to obtain a round product. When the reduction process is applied to the continuous casting round billet, the increase in the ellipticity of the round billet after the reduction process can be effectively controlled, and the round billet can be reduced under the premise of maintaining the stability of the shape of the round billet. For the pressing operation of the round billet, this application adopts the method of alternately setting the arc-shaped first pressing roll and the second pressing roll, which avoids the problem that the finished product of the traditional process has too much ellipticity and the shape does not meet the circular requirement, and is effective Improved the minification effect.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

The drawings described here are used to provide a further understanding of the application and constitute a part of the application. The schematic embodiments and descriptions of the application are used to explain the application and do not constitute an improper limitation to the application. In the attached picture:

Fig. 1 shows a schematic flow chart of a method for pressing a round billet provided by an embodiment of the present application;

Fig. 2 shows a process schematic diagram of another round billet pressing method provided by the embodiment of the present application;

Fig. 3 shows a perspective view of the first pressing roller of another round billet pressing method provided by the embodiment of the present application;

Fig. 4 shows the front view of the first pressing roller of another round billet pressing method provided by the embodiment of the present application;

Fig. 5 shows a schematic structural view of a round billet pressing device provided in an embodiment of the present application.

Detailed ways

Hereinafter, the present application will be described in detail with reference to the drawings and embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

In this embodiment, a method for pressing a round billet is provided, as shown in Figure 1, the method includes:

Step 101, alternately setting the first tension-leveler and the second tension-leveler, wherein each first tension-leveler includes a pair of oppositely arranged first pressing rolls, and each second tension-leveler includes a pair of oppositely arranged The second press roll, the direction of the first press roll and the second press roll are perpendicular to each other, the first target shape parameter of the first press roll is the same as the second target shape parameter of the second press roll;

The round billet pressing method provided in the embodiment of the present application is mainly used to solve the problem that the square billet and slab pressing schemes in the prior art are not applicable to the round billet. Based on this, in the above step 101, the first tension-leveler 510 and the second tension-leveler 520 are alternately arranged respectively, wherein the first pressing roll 210 of the first tension-leveler 510 and the second roller 210 of the second tension-leveler 520 The pressing rollers 220 are all arc-shaped, and the directions of the first pressing roller 210 and the second pressing roller 220 are perpendicular to each other, so that the round billet can be pressed at the first pressing roller 210 to become an oval shape. , the second pressing roller 220 is subjected to compaction force perpendicular to the first pressing roller 210 to reduce the ellipticity of the round billet so that its shape is more in line with the requirement of a circle.

The second target shape parameter of the second press roll 220 is the same as the first target shape parameter of the first press roll 210, so there is no need to set two press rolls with different shapes, which reduces the production cost.

Further, as shown in FIG. 2 , the first pressing roller 210 may be in the up-down direction, and the second pressing roller 220 may be in the left-right direction. At this time, the stretching and straightening machine adopts a pressing method in which the upper and lower compacts and the left and right compacts are alternately arranged along the drawing direction. After pressing in the up-down direction or left-right direction at the pair of pressing rollers, carry out the pressing in the direction perpendicular to the previous pass at the lower pair of pressing rollers, which can effectively improve the extrusion of the round billet by the upper pair of pressing rollers. The ellipticity produced by pressing, by alternately pressing the round billet in the up-down direction and left-right direction, a round product is obtained.

Of course, the first pressing roller 210 and the second pressing roller 220 may also be in other directions, which is not limited here.

Step 102, determining the target reduction amount R corresponding to the first reduction roller and the second reduction roller;

Step 103, according to the target reduction amount R, control the first pressing roller and the second pressing roller to perform a pressing operation on the round billet.

In this embodiment, in order to achieve a better reduction effect, the target reduction amount corresponding to the first reduction roller 210 and the second reduction roller 220 can be set, and the first reduction roller 210 and the second reduction roller 210 can be controlled. The rollers 220 perform a reduction operation by a target reduction amount.

By applying the technical solution of this embodiment, multiple pairs of arc-shaped pressing rollers are arranged alternately and the directions are vertical, and the round billets are alternately pressed in mutually perpendicular directions to obtain circular products. When the reduction process is applied to the continuous casting round billet, the increase in the ellipticity of the round billet after the reduction process can be effectively controlled, and the round billet can be reduced under the premise of maintaining the stability of the shape of the round billet. For the pressing operation of the round blank, this embodiment adopts the method of alternately setting the arc-shaped first pressing roll 210 and the second pressing roll 220, which avoids the problem that the finished product of the traditional process has too much ellipticity and the shape does not meet the circular requirement. problem, effectively improving the compression effect.

Further, as a refinement and extension of the specific implementation of the above embodiment, in order to fully describe the specific implementation process of this embodiment, another round billet pressing method is provided, the method includes:

Step 301, determining that the position where the solid phase ratio of the center of the round billet is 0.3 is the starting position and the position where the solid phase ratio of the round billet center is 1 is the end position;

Specifically, when drawing the billet, the farther the place is pulled out, the closer it is to the solidified state because it takes longer to be drawn out. That is to say, the solid phase ratio is different at different lengths of the round billet along the billet drawing direction. Therefore, according to the two-dimensional slice model of continuous casting round billet solidification and heat transfer, the solid phase ratio at the center of the round billet at different lengths along the stretching direction, that is, the solid phase ratio at each point on the central axis of the cylindrical round billet, can be found. The position at which the solid fraction is 0.3 is taken as the start position, and the position at which the solid fraction is 1 is taken as the end position. Wherein, the position where the solid phase ratio is 1 is the position where the round billet just solidifies.

Specifically, the parameters of the solidification and heat transfer two-dimensional slice model of the continuous casting round billet include steel grade solid-liquid phase line, heat transfer coefficient, specific heat, solidification latent heat steel grade information and round billet section size, casting superheat, pouring speed, various Cooling zone length and water volume continuous casting production parameters.

Furthermore, the temperature corresponding to the two-dimensional slice of the round blank at different times can be extracted, and the model parameters can be adjusted and calibrated by comparing it with the actual temperature on site.

Certainly, the position of other numerical values of the solid phase rate can also be used as the starting position or the ending position, which is not limited here.

Step 302, setting a first tension leveler at the starting position, setting a second tension leveler at the end position, and arranging other first tension levelers and second tension levelers alternately at the start position and the end position Between positions, wherein, each first tension-leveler includes a pair of oppositely arranged first press-down rolls, and each second tension-leveller includes a pair of oppositely arranged second press-down rolls, the first press-down rollers and The directions of the second pressing rollers are perpendicular to each other;

Specifically, the first tension leveler 510 and the second tension leveler 520 are alternately arranged between the starting position and the ending position. During the billet drawing process, the round billet is sequentially pressed down by a plurality of first tension-leveler machines 510 and second tension-leveler machines 520 arranged alternately.

In addition, the end position can also be set on the side of the solidification end (that is, the position where the solid phase ratio is 1) away from the initial position. At this time, the initial position, the solidification end and the end position are arranged in sequence, and the first tension leveling The machine 510 and the second tension leveling machine 520 are arranged alternately between the starting position and the ending position.

Optionally, the position of the first pressing roller 210 can be set at a solid phase ratio of 0.6 to 1.0 in the center of the round billet, and the first pressing roller 210 can transfer the reduction amount to the inside of the round billet, thereby improving the solid phase ratio of the round billet. Problems such as porosity and central shrinkage cavity can be solved, and the uniformity of solute distribution and the density of the billet center can be improved. The second pressing roller 220 is arranged after the first pressing roller 210, not only can transfer the amount of reduction to the inside of the round billet, but also can improve the final shape characteristics of the round billet.

Step 303, among a plurality of preset reduction amounts, respectively determine the compaction force corresponding to each reduction amount when the reduction operation is performed at the pressing position according to each reduction amount;

Specifically, multiple reductions are preset, and different reductions can be achieved by applying different compacting forces. Therefore, at the end of solidification, that is, the position where the solid phase ratio is 1, determine how much compacting force is required Only then can the preset reduction amount be realized, that is, the compaction force corresponding to each reduction amount can be determined.

分别设置压下量20mm、25mm、30mm、35mm、40mm，分别确定完成上述压下量所需要的拉矫机压坯力分别为118ton、132ton、146ton、160ton和176ton。For example, an arc with a radius of 175 mm is used as the initial roll shape of the first press roll 210 and the second press roll 220, and the thickness of the press roll is

Set the reductions of 20mm, 25mm, 30mm, 35mm, and 40mm respectively, and determine the compaction forces of the stretching and leveling machine required to complete the above reductions respectively as 118ton, 132ton, 146ton, 160ton and 176ton.

倍，在保证压下辊表面的质量的前提下，节省压下辊的生产材料，降低生产成本。Further, the thickness of the pressing roller is the radius of the arc

times, on the premise of ensuring the quality of the surface of the pressing roller, the production material of the pressing roller is saved, and the production cost is reduced.

Step 304, among the compaction forces less than or equal to the safe compaction force, select the largest reduction amount as the target reduction amount R;

Specifically, the tension leveling machine is provided with a safety compaction force, if the compaction force is greater than the safety pressure, the tension leveler may be damaged. Therefore, determine whether the compaction force corresponding to each reduction amount is less than or equal to the safe compaction force, and then select a reduction amount corresponding to the compaction force as the target reduction in the compaction force that will not damage the tension leveler quantity. Since the reduction efficiency is higher when the reduction amount is larger, the maximum reduction amount can be selected as the target reduction amount.

For example, the reduction amounts are 20mm, 25mm, 30mm, 35mm, and 40mm, respectively, and the compaction forces corresponding to each reduction amount are 118ton, 132ton, 146ton, 160ton, and 176ton respectively. Since the safe compaction force of the tension leveling machine is 160ton, the target reduction amount is selected in the compaction force less than or equal to 160ton. In addition, since the maximum reduction amount corresponding to the compaction force is 35 mm when the compaction force is less than or equal to 160 tons, 35 mm can be selected as the target reduction amount.

Step 305, obtaining the diameter d of the round billet;

计算得到第一形状参数，其中，第一形状参数包括第一短半轴参数a和第一长半轴参数b；Step 306, according to a=dR,

calculating a first shape parameter, wherein the first shape parameter includes a first semi-minor axis parameter a and a first semi-major axis parameter b;

Specifically, the pressing roller is obtained by rotating an elliptical arc, and is in the shape of an elliptical arc. Therefore, the specific shape of the press roll can be determined according to the radius of the major semi-axis and the radius of the minor semi-axis. Fig. 3 shows a perspective view of a first press-down roll 210, and Fig. 4 shows a front view of a first press-down roll 210 whose thickness is D and whose diameter is L. Finally, an ellipse can be determined according to the radius of the major and minor semi-axes, and the arc of the ellipse can be rotated to obtain the first pressing roller 210 . Therefore, changing the semi-major radius and the semi-minor radius can change the shape of the first press roll 210 , so the semi-major radius and the semi-minor radius are used as the shape parameters of the first press roll 210 .

For example, when the diameter d of the round billet is 350mm and the maximum reduction R is 35mm, the first semi-short axis parameter is: a=d-R=350-35=315.0mm,

And the first semi-major axis parameter is:

Step 307, using the diameter of the round blank as the second semi-minor axis parameter and the second semi-major axis parameter of the second shape parameter;

For example, when the diameter d of the round billet is 350 mm, the second semi-minor axis parameter and the second semi-major axis parameter of the second shape parameter are both 350 mm.

Step 308, setting at least one third shape parameter, wherein, the third semi-minor axis of the third shape parameter is greater than the first semi-minor axis parameter and smaller than the second semi-minor axis parameter, and the third semi-major axis of the third shape parameter The parameter is smaller than the first semi-major axis parameter and greater than the second semi-major axis parameter, the first semi-minor axis parameter, at least one third semi-minor axis parameter and the second semi-minor axis parameter are in arithmetic sequence relationship, the first The semi-major axis parameter, at least one third semi-major axis parameter and the second semi-major axis parameter have an arithmetic sequence relationship, wherein the number of the third shape parameter is two;

Specifically, one or more third shape parameters are set, wherein, the third semi-minor axis parameter of the third shape parameter is between the first semi-minor axis parameter and the second semi-minor axis parameter, and the third semi-major axis parameter Between the first semi-major axis parameter and the second semi-major axis parameter. Thus, multiple sets of different shape parameters are set for selection, among the first shape parameter, the second shape parameter and at least one third shape parameter, an appropriate shape parameter can be selected to achieve a better depressing effect.

Optionally, the relationship between the first semi-minor axis parameter, at least one third semi-minor axis parameter and the second semi-minor axis parameter is an arithmetic sequence relationship, and the first semi-major axis parameter, at least one third semi-major axis parameter and The parameters of the second semi-major axis are also in arithmetic sequence relationship. The distribution of the parameters of the third semi-short axis set in this way is more uniform, which is conducive to selecting a shape parameter with a better pressing effect.

For example, when the first semi-minor axis parameter is 315.0mm, the first semi-major axis parameter is 388.9mm, and the second semi-minor axis parameter and the second semi-major axis parameter are both 350mm, if the third shape parameter is two , then the third semi-minor axis parameters of the two third shape parameters can be 326.7mm and 338.3mm respectively, and the third semi-major axis parameters can be 375.9mm and 362.9mm respectively. At this time, the first semi-short axis parameter, the two third semi-short axis parameters and the second semi-short axis parameter have the following arithmetic sequence relationship: 315.0mm, 326.7mm, 338.3mm, 350mm; and the first long semi-axis The axis parameters, the two third major semi-axis parameters and the second major semi-axis parameters have the following arithmetic sequence relationship: 388.9mm, 375.9mm, 362.9mm, 350mm.

Step 309, determining each of the first shape parameter, the second shape parameter and the third shape parameter as the first shape parameter to be selected;

Step 310, determining the surface strain value and surface strain concentration of the round blank when the pressing operation is performed with each first parameter to be selected;

Step 311, when the surface strain value is less than the surface strain threshold and the surface strain concentration is less than the concentration threshold, use the first parameter to be selected corresponding to the surface strain value as the second parameter to be selected;

Specifically, during the pressing process, if the surface strain value is too large or surface strain concentration occurs, the pressed round billet will have surface cracks and other phenomena, which will affect the quality of the product. Therefore, it is possible to determine the surface strain value and surface strain concentration corresponding to each first shape parameter to be selected, and select the first shape parameter to be selected whose surface strain value and surface strain concentration meet the requirements, so as to avoid the Cracks etc. appear on the surface.

Further, the strain degree can be indicated by observing the strain nephogram. Among them, the strain nephogram can express the strain of different parts of the stressed object, that is, the round billet, in the form of a moiré diagram, so as to clearly see the deformation.

Step 312, determining the central strain value of the round blank when the pressing operation is performed with each second parameter to be selected;

Step 313, comparing the magnitude of the central strain value, using the second parameter to be selected corresponding to the largest central strain value as the first target shape parameter, wherein the first target shape parameter includes a semi-minor axis parameter and a semi-major axis parameter;

Specifically, during the reduction process, if the central strain value is larger, it indicates that the central backlog effect of the round billet is also greater, and the reduction effect is better. Therefore, the central strain value corresponding to each second shape parameter to be selected can be determined, and the second shape parameter to be selected with the largest central strain value can be selected as the first target shape parameter to improve the reduction effect and make the finished product denser. higher.

For example, one of the second shape parameters to be selected is: a=315mm, b=388.9mm, and its corresponding central strain value is 0.021; another second shape parameter to be selected is: a=326.7mm, b=375.9mm, The corresponding central strain value is 0.023. Since 0.023>0.021, a=326.7mm and b=375.9mm are selected as the first target parameters.

Step 314, determining a second target shape parameter of the second press roller 220, wherein the first target shape parameter and the second target shape parameter are the same;

The second target shape parameter of the second press roll 220 is the same as the first target shape parameter of the first press roll 210, so there is no need to set two press rolls with different shapes, which reduces the production cost.

This embodiment determines the stress and strain of the round billet after being squeezed by the first pressing roller 210 and the second pressing roller 220 in sequence, and then determines whether there is excessive concentration of profits caused by the unreasonable shape of the pressing rollers in the instant noodles of the round billet Or the phenomenon of excessive concentration of strain. Further, by comparing the central strain of the round billet in different roll shape schemes, the roll shape scheme with smaller shell strain, no concentration, and larger center strain is taken as the best roll shape scheme.

Step 315 , according to the target reduction amount R, control the first pressing roller 210 and the second pressing roller 220 to perform a pressing operation on the round billet.

In the above-mentioned embodiment, after the target reduction amount, the first target shape parameter and the second target shape parameter are determined, according to the target reduction amount, the first pressing roll 210 and the second pressing roll having a specific shape are used 220 executes the pressing operation on the round billet to obtain a finished product that meets the requirements.

By applying the technical solution of this embodiment, the starting position, the end position and the pressing position are determined by using the solid phase ratio of each point on the central axis of the cylindrical round billet, and the first pressing roll 210 and the second pressing roll 220 Alternately set between the start position and the end position, and according to the corresponding relationship between the different reduction amounts and the compaction force at the reduction position, the target reduction amount is determined according to the safe compaction force that the tension leveler can bear. Further, a number of different shape parameters are determined according to the target reduction and the diameter of the round billet, and an appropriate shape parameter is selected as the target shape parameter according to the degree of strain when using different shape parameters. Finally, according to the target reduction amount, the round billet is reduced by using the first reduction roller 210 and the second reduction roller 220 set with the target shape parameters. In this embodiment, the first pressing roller 210 and the second pressing roller 220 are arranged alternately, so that the shape of the finished product is more in line with the circular requirement, and the pressing effect is improved through the design of the target reduction amount and target shape parameters , making it denser and less prone to cracks. This embodiment can control the stability of the surface quality of the continuous casting round billet during the pressing process of the round billet, and will not cause surface cracks to expand due to the pressing, ensuring that the deformation of the round billet shell will not be too large and the strain will not Excessive concentration, thereby avoiding the problem of new surface cracks on the surface of the round billet due to the pressing process. Compared with the traditional reduction scheme, the reduction amount of this embodiment can be efficiently transferred to the center of the round billet to improve the center segregation, center shrinkage cavity and center porosity of the round billet, and increase the density and homogeneity of the continuous casting round billet It can effectively ensure the reduction efficiency of the round billet and greatly improve the internal quality of the continuous casting round billet.

Further, as a specific implementation of the methods shown in Figures 1 and 2, the embodiment of the present application provides a round blank pressing device 500, as shown in Figure 5, the device includes: a first tension straightening machine 510, a second tension straightening machine 510, Correction machine 520 , determination module 530 and control module 540 .

The first tension-leveler 510 and the second tension-leveler 520 are arranged alternately, each first tension-leveler 510 includes a pair of oppositely arranged first pressing rolls, and each second tension-leveller 520 includes a pair of oppositely arranged The second pressing roll, the direction of the first pressing roll and the second pressing roll are perpendicular to each other, the first target shape parameter of the first pressing roll is the same as the second target shape parameter of the second pressing roll;

A determination module 530, configured to determine a target reduction amount R corresponding to the first reduction roller and the second reduction roller;

The control module 540 is configured to control the first pressing roller and the second pressing roller to perform a pressing operation on the round billet according to the target reduction amount R.

It should be noted that for other corresponding descriptions of the functional modules involved in the round billet pressing device 500 provided in the embodiment of the present application, reference may be made to the corresponding descriptions in FIG. 1 to FIG. 5 , which will not be repeated here.

Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred implementation scenario, and the units or processes in the accompanying drawings are not necessarily necessary for implementing the present application. Those skilled in the art can understand that the units in the devices in the implementation scenario can be distributed among the devices in the implementation scenario according to the description of the implementation scenario, or can be located in one or more devices different from the implementation scenario according to corresponding changes. The units of the above implementation scenarios can be combined into one unit, or can be further split into multiple sub-units.

The serial numbers of the above application are for description only, and do not represent the pros and cons of the implementation scenarios. The above disclosures are only a few specific implementation scenarios of the present application, but the present application is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present application.

Claims (7)

1. A method for pressing down a round billet, characterized in that the method comprises: The first tension-leveler and the second tension-leveler are arranged alternately, wherein each of the first tension-leveler includes a pair of oppositely arranged first pressing rolls, and each of the second tension-leveler includes a pair of opposite The second pressing roll is set, the direction of the first pressing roll and the second pressing roll are perpendicular to each other, the first target shape parameter of the first pressing roll is the same as the second pressing roll of the second pressing roll The target shape parameters are the same; determining a target reduction amount R corresponding to the first reduction roller and the second reduction roller; controlling the first pressing roll and the second pressing roll to perform a pressing operation on the round billet according to the target reduction amount R; Before the controlling of the first pressing roller and the second pressing roller to perform the pressing operation, the method further includes: determining the first target shape parameter and the second target shape parameter, wherein the first target shape parameter includes a semi-minor axis parameter and a semi-major axis parameter; The first target shape parameter of the first press roll and the second target shape parameter of the second press roll specifically include: Obtain the diameter d of the round billet; According to the diameter d of the round billet and the target reduction R, a first shape parameter is calculated, wherein the first shape parameter includes a first semi-minor axis parameter a and a first semi-major axis parameter b; Using the diameter of the round blank as the second semi-minor axis parameter and the second semi-major axis parameter of the second shape parameter respectively; Setting at least one third shape parameter, wherein, the third semi-minor axis parameter of the third shape parameter is greater than the first semi-minor axis parameter and smaller than the second semi-minor axis parameter, and the third shape parameter The third semi-major axis parameter is less than the first semi-major axis parameter and greater than the second semi-major axis parameter; Among said first shape parameter, said second shape parameter and said at least one third shape parameter, selecting said first target shape parameter; The selecting the first target shape parameter among the first shape parameter, the second shape parameter and the at least one third shape parameter specifically includes: determining each of the first shape parameter, the second shape parameter and the third shape parameter as a first shape parameter to be selected; determining the surface strain value and the surface strain concentration of the round blank when the pressing operation is performed with each of the first shape parameters to be selected; When the surface strain value is less than the surface strain threshold and the surface strain concentration is less than the concentration threshold, the first shape parameter to be selected corresponding to the surface strain value is used as the second parameter to be selected; determining the central strain value of the round blank when the pressing operation is performed with each of the second parameters to be selected; Comparing the magnitudes of the central strain values, using the second parameter to be selected corresponding to the largest central strain value as the first target shape parameter. 2. The round billet reduction method according to claim 1, wherein said determining the target reduction amount R corresponding to said first reduction roller and said second reduction roller specifically comprises: Determining the compaction force corresponding to each of the multiple preset reduction amounts; Among the compaction forces less than or equal to the safe compaction force, the largest reduction amount is selected as the target reduction amount R. 3. The pressing method of a round billet according to claim 2, wherein said determining the pressing force corresponding to each said pressing amount specifically comprises: Determine the position where the solid phase ratio of the center of the round billet is 1 as the pressing position; When the pressing operation is performed at the pressing position according to each of the pressing amounts, the green compacting force corresponding to each of the pressing amounts is respectively determined. 4. The method for reducing a round billet according to claim 1, said calculating the first shape parameter according to the diameter d of said round billet and said target reduction amount R, specifically comprising: a=dR,

5. The pressing method of the round billet according to claim 1, characterized in that, The first semi-minor parameter, at least one of the third semi-minor parameter and the second semi-minor parameter are in an arithmetic sequence relationship; The relationship between the first semi-major axis parameter, at least one of the third semi-major axis parameters and the second semi-major axis parameter is an arithmetic sequence relationship; Wherein, the number of the third shape parameters is two. 6. The method for pressing round billets according to claim 1, characterized in that the alternate arrangement of the first tension leveler and the second tension leveler specifically comprises: Determine the position where the solid phase rate of the center of the round billet is 0.3 as the starting position and the position where the solid phase rate of the center of the round billet is 1 as the end position; setting one of the first tension leveling machines at the starting position, one of the second tension leveling machines at the end position, and setting the other of the first tension leveling machine and the second tension leveling machine Machines are arranged alternately between said start position and said end position. 7. A round billet pressing device, characterized in that the device comprises: The first tension leveling machine and the second tension leveling machine, wherein, the first tension leveling machine and the second tension leveling machine are arranged alternately, and each of the first tension leveling machines includes a pair of oppositely arranged first presses Lower rolls, each of the second tension levelers includes a pair of second pressing rolls oppositely arranged, the direction of the first pressing roll and the second pressing roll are perpendicular to each other, the first pressing roll The first target shape parameter is the same as the second target shape parameter of the second press roll; A determination module, configured to determine a target reduction amount R corresponding to the first reduction roller and the second reduction roller; A control module, configured to control the first pressing roller and the second pressing roller to perform a pressing operation on the round billet according to the target reduction amount R; The determining module is also used to determine the first target shape parameter and the second target shape parameter, wherein the first target shape parameter includes a semi-minor axis parameter and a semi-major axis parameter; specifically for: Obtain the diameter d of the round billet; According to the diameter d of the round billet and the target reduction R, a first shape parameter is calculated, wherein the first shape parameter includes a first semi-minor axis parameter a and a first semi-major axis parameter b; Using the diameter of the round blank as the second semi-minor axis parameter and the second semi-major axis parameter of the second shape parameter respectively; Setting at least one third shape parameter, wherein, the third semi-minor axis parameter of the third shape parameter is greater than the first semi-minor axis parameter and smaller than the second semi-minor axis parameter, and the third shape parameter The third semi-major axis parameter is less than the first semi-major axis parameter and greater than the second semi-major axis parameter; determining each of the first shape parameter, the second shape parameter and the third shape parameter as a first shape parameter to be selected; determining the surface strain value and the surface strain concentration of the round blank when the pressing operation is performed with each of the first shape parameters to be selected; When the surface strain value is less than the surface strain threshold and the surface strain concentration is less than the concentration threshold, the first shape parameter to be selected corresponding to the surface strain value is used as the second parameter to be selected; determining the central strain value of the round billet when the pressing operation is performed with each of the second parameters to be selected; Comparing the magnitudes of the central strain values, using the second parameter to be selected corresponding to the largest central strain value as the first target shape parameter.

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