Method for checking model of sector section of thin slab continuous casting machine
阅读说明：本技术 一种薄板坯连铸机扇形段校核模型的方法 (Method for checking model of sector section of thin slab continuous casting machine ) 是由 韩靳 于 2019-09-20 设计创作，主要内容包括：本发明涉及一种薄板坯连铸机扇形段校核模型的方法,用于冶金企业薄板坯连铸机扇形段辊缝的调节,属连铸设备技术领域。技术方案是：<Image he="21" wi="17" file="DEST_PATH_IMAGE002.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>测量薄板坯连铸机扇形段在不同液压夹紧压力下的扇形段辊缝偏差,确定扇形段离线校核的液压压力；根据扇形段的机械结构和在线位置,理论计算出扇形段进出口的在线校核压力,并进行修改；优化扇形段的校核程序,直至扇形段进出口的辊缝偏差值满足±0.5mm要求。本发明的有益效果：通过改变扇形段进出口压力、优化扇形段校核模型,提高了薄板坯连铸机扇形段的辊缝精度,具有广泛的推广应用前景。(The invention relates to a method for checking a model of a sector section of a thin slab continuous casting machine, which is used for adjusting a roll gap of the sector section of the thin slab continuous casting machine in a metallurgical enterprise and belongs to the technical field of continuous casting equipment. The technical scheme is as follows: measuring the roll gap deviation of the fan-shaped section of the thin slab continuous casting machine under different hydraulic clamping pressures, and determining the hydraulic pressure for off-line checking of the fan-shaped section; theoretically calculating the online check pressure of the inlet and the outlet of the sector section according to the mechanical structure and the online position of the sector section, and modifying; and optimizing the checking program of the sector section until the roll gap deviation value of the inlet and the outlet of the sector section meets the requirement of +/-0.5 mm. The invention has the beneficial effects that: the roll gap precision of the fan-shaped section of the thin slab continuous casting machine is improved by changing the inlet and outlet pressure of the fan-shaped section and optimizing the fan-shaped section checking model, and the method has wide popularization and application prospects.)
1. A method for checking a sector section of a thin slab casting machine is characterized by comprising the following steps:
theoretically calculating the online check pressure of the inlet and the outlet of the sector section according to the mechanical structure and the online position of the sector section, and modifying;
2. The method for checking the sector segment model of the thin slab caster as claimed in claim 1, wherein said optimizing the sector segment checking process comprises the steps of:
a) modifying the upper limit of the closing pressure to prevent the excessive closing pressure from impacting the sector limiting column;
b) modifying the target position of the calibration section, setting the opening of the calibration section to be 0.5mm larger than the preset opening, and preventing the limiting column from deforming in the closing process of the sector section;
c) setting a pressure control mode to be unchanged before the calibration offset is calculated, and preventing the pressure change from influencing the calculation of the calibration offset;
d) and (4) finely adjusting the inlet pressure and the outlet pressure of the sector section according to the test result of the online handheld roll gap meter until the roll gap deviation value of the inlet and the outlet of the sector section is within +/-0.5 mm.
Technical Field
The invention relates to a method for checking a model of a sector section of a thin slab continuous casting machine, which is used for adjusting a roll gap of the sector section of the thin slab continuous casting machine in a metallurgical enterprise and belongs to the technical field of continuous casting equipment.
Background
At present, a Daneli thin slab continuous casting machine is widely applied in the field of metallurgy, and the Daneli thin slab continuous casting machine has A, B, C, D four types of fan-shaped sections, wherein the fan-shaped section A, B is an arc-shaped section, and the inner arc roll surface and the outer arc roll surface are approximate arcs; the sector section C belongs to a straightening section, and the inner arc and outer arc roll surfaces of the sector section C are between an arc and a horizontal shape; the sector section D is a horizontal section, and the inner arc roller surface and the outer arc roller surface are in a standard level. The prior art has the following problems: the sector A, B, C is installed on line at a certain angle to the horizontal line, so that the roll gap check and off-line check of the online sector are different greatly, and the movable side and the fixed side of the sector of the thin slab continuous casting machine designed by Daniely have no reliable guide for realizing the large rolling reduction of a single sector.
Disclosure of Invention
The invention aims to provide a method for checking a sector section checking model of a thin slab continuous casting machine, which solves the problems in the prior art by changing the inlet and outlet pressure of the sector section, optimizing the sector section checking model and adjusting the roll gap deviation of the inlet and outlet of the sector section to the target requirement.
The technical scheme of the invention is as follows: a method for checking a sector section of a thin slab casting machine comprises the following steps:
measuring the roll gap deviation of the fan-shaped section of the thin slab continuous casting machine under different hydraulic clamping pressures, and determining the hydraulic pressure for off-line checking of the fan-shaped section;
The checking program of the optimized sector segment comprises the following steps:
a) modifying the upper limit of the closing pressure to prevent the excessive closing pressure from impacting the sector limiting column;
b) modifying the target position of the calibration section, setting the opening of the calibration section to be 0.5mm larger than the preset opening, and preventing the limiting column from deforming in the closing process of the sector section;
c) setting a pressure control mode to be unchanged before the calibration offset is calculated, and preventing the pressure change from influencing the calculation of the calibration offset;
d) and (4) finely adjusting the inlet pressure and the outlet pressure of the sector section according to the test result of the online handheld roll gap meter until the roll gap deviation value of the inlet and the outlet of the sector section is within +/-0.5 mm.
The invention solves the problems of large inlet roll gap and small outlet roll gap of the sector-shaped sawtooth roll gap.
The invention has the beneficial effects that: by changing the pressure of the inlet and the outlet of the fan-shaped section and optimizing the fan-shaped section checking model, the roll gap deviation value of the inlet and the outlet of the fan-shaped section meets the range of +/-0.5 mm; the roll gap precision of the fan-shaped section of the thin slab continuous casting machine is improved, and the method has wide popularization and application prospects.
Drawings
FIG. 1 is a schematic mechanical structure diagram of a segment of a continuous casting machine according to an embodiment of the invention;
FIG. 2 is a view illustrating a cause of a sawtooth-shaped roll gap of a sector section according to an embodiment of the present invention;
FIG. 3 is a graph illustrating a force analysis of a segment according to an embodiment of the present invention;
FIG. 4 is a segment closing pressure modification diagram in accordance with an embodiment of the present invention;
FIG. 5 is a diagram illustrating a target location modification according to an embodiment of the present invention;
in the figure: f1For checking the pressure of the hydraulic cylinders at the inlet, F2For checking the pressure of the hydraulic cylinder at the outlet, G being the weight of the sector at the active side, FNFor balancing the tilting forces on the active side of the sector, perpendicular to F1The force of the direction is not taken into account (the direction does not have an effect on the sector check).
Detailed Description
The invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
TABLE 1
Table 1 is a roll gap deviation table of the sector section a (section 1) under different hydraulic pressures;
TABLE 2
And table 2 is a theoretical calculated sector section inlet and outlet check pressure gauge.
In the embodiment, taking the sector segment a (segment 1) as an example, the specific steps of the invention are as follows:
the roll gap deviation of the section 1 under different hydraulic pressures is measured, the result is shown in table 1, factors such as friction force, opening pressure of a servo valve, mechanical limiting rigidity and the like are comprehensively considered, and the hydraulic pressure of the section offline checking is determined to be 70 bar.
As shown in fig. 3, theoretically calculating the online check pressure of the inlet and outlet of the 1 section according to the online position of the 1 section:
the weight of the movable side of the segment 1 of the sector is 6711kg, the closing pressure of the hydraulic cylinder is 70bar, the opening pressure of the hydraulic cylinder is 33bar, the diameter of a piston of the hydraulic cylinder is 180mm, the diameter of a piston rod of the hydraulic cylinder is 80mm, and the online installation position forms 14 degrees with the vertical direction.
The pressure of a single hydraulic cylinder = (9 × 9-4 × 4) × 3.14 × 70-9 × 9 × 3.14 × 33=5894kg ≈ 5.9t,
inlet pressure = outlet pressure =5.9 × 2+6.71/2=15.2 t.
FN×219+FN×221=G×cos14º×297.2
Substituting the data to obtain FN=4400kg=4.4t
Then F1=15.2/2+4.4/2-6.7×sin14º/4=9.4t
F2=15.2/2-4.4/2-6.7×sin14º/4=5t
Modifying the 1-section online check pressure according to the results in the table 2;
as shown in fig. 4, the upper closing pressure limit is modified;
as shown in fig. 5, the position target of the school section is modified;
setting the pressure control mode to be unchanged before the calibration offset calculation is completed;
after the sector A is installed again, the deviation of the roll gap between the inlet and the outlet is measured to be +0.37mm and-0.15 mm respectively by a hand-held roll gap instrument, and the sector is checked within +/-0.5 mm.