Control method for preventing roll neck of first intermediate roll of rolling mill from being broken

Abstract

The invention relates to a control method for preventing a roll neck of a first intermediate roll of a rolling mill from being fractured, which is characterized by comprising the following steps of: confirming a value position O of an 'O' value of a roll system diagram of a SUNDWIG rolling mill; analyzing the data of the SUNDWIG rolling mill first intermediate roll neck fracture accident roll matching graph; analyzing the data of the suspension structure diagram of the first intermediate roll transmission side bearing seat of the SUNDWIG rolling mill to obtain the distance d1 between the left and right center lines of the rolling mill and the center line of a left outer ring, the radius r1 of a left inner hole, the distance d2 between the center line of the left inner hole and the center line of a right outer ring and the distance d3 between the center line of the left outer ring and the center line of the right outer ring; analyzing the structural data of the transmission side bearing seat of the first intermediate roll of the SUNDWIG rolling mill to obtain the radius r of the transmission side bearing seat of the first intermediate roll; the minimum value Omin of the O value is calculated, the O value is compared with the Omin value, and if the O value is smaller than the Omin value, the O value is controlled to be within the range of the maximum value and the minimum value. The lower limit of the space position of the first intermediate roll is limited, and the roll neck of the first intermediate roll is prevented from being broken in the production process.

Description

Technical Field

[0001] The invention relates to the field of cold-rolled stainless steel, and in particular to a control method for preventing the neck of a first intermediate roll of a rolling mill from breaking. Background Art

[0002] In the cold-rolled stainless steel production process, the rolling mill is a key unit, and safe and stable production is an important basis for ensuring the improvement of the unit's production capacity. SUNDWIG rolling mill roll matching software is provided by the original manufacturer. During use, the first intermediate roll neck was broken many times due to roll matching problems, resulting in multiple first intermediate rolls being scrapped and the rolling mill shutting down. The uncertainty of the roll matching problem has a serious impact on the production efficiency of the rolling mill.

[0003] For the continuous occurrence of multiple roll neck fracture accidents on the first intermediate rolls of the SUNDWIG rolling mill, the matching rolls were first rechecked, and no error information was prompted; in addition, the suspension equipment on the transmission side was checked, and no incorrect size or abnormal wear was found. Finally, through analysis, it was found that the software for matching rolls only has restrictions on the upper limit of the spatial position of the first intermediate roll. As long as the "O" value>Omax (the actual calculated size of the Omax value is 64mm), there will be an interference information prompt, and there is no interlocking interference information prompt for the lower limit of the spatial position from the center line of the suspension to the center line of the first intermediate roll, resulting in the above accidents even when there is no abnormality after the roll matching. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a control method for preventing the neck of the first intermediate roll of a rolling mill from breaking in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above technical problem is: a control method for preventing the neck of the first intermediate roll of a rolling mill from breaking, characterized in that it comprises the following steps:

[0006] S1. Confirm the position of "O" value in the SUNDWIG rolling mill roll system diagram;

[0007] S2. Analyze the roll matching diagram data of the first intermediate roll neck fracture accident of SUNDWIG rolling mill;

[0008] S3. Analyze the data of the suspension structure diagram of the bearing seat on the driving side of the first intermediate roll of the SUNDWIG rolling mill, and obtain the distance d1 between the left and right center lines of the rolling mill and the center line of the left outer ring, the radius r1 of the left inner hole, the distance d2 between the center line of the left inner hole and the center line of the right outer ring, and the distance d3 between the center line of the left outer ring and the center line of the right outer ring;

[0009] S4. Analyze the structural data of the bearing seat on the transmission side of the first intermediate roll of the SUNDWIG rolling mill to obtain the radius r of the bearing seat on the transmission side of the first intermediate roll;

[0010] S5. Calculate the minimum value Omin of the "O" value, compare the O value with the Omin value, and if the O value is less than the Omin value, control the O value to be within the range of the maximum and minimum values.

[0011] Furthermore, in the step S1, the value "O" of the SUNDWIG rolling mill roll diagram is the distance O between the center position of the first intermediate roll and the left and right center lines of the rolling mill.

[0012] Furthermore, in the step S2, the "O" value in the roll matching diagram of the first intermediate roll neck fracture accident of the SUNDWIG rolling mill is affected by the changes in the diameters of the rolls in the roll system and can be automatically calculated by the roll matching software.

[0013] Furthermore, the maximum value of the O value is the O value automatically calculated by the roller matching software.

[0014] Furthermore, in step S5, the calculation formula of Omin is Omin=r+(d1-(r1+(d2-d3))).

[0015] Compared with the prior art, the advantages of the present invention are: the control method for preventing the neck of the first intermediate roll of the rolling mill from breaking calculates the lower limit of the O value of the first intermediate roll of the upper roll system, limits the lower limit of the spatial position of the first intermediate roll, and prevents the neck of the first intermediate roll from breaking during the production process. The operation is simple, practical and reliable, and ensures the safe, stable and efficient production of the rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of a flow chart of an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below with reference to the accompanying drawings.

[0018] like Figure 1 As shown, a control method for preventing the neck of the first intermediate roll of a rolling mill from breaking in this embodiment includes the following steps:

[0019] S1. Confirm that the "O" value position of the SUNDWIG rolling mill roll system diagram is O. The "O" value of the SUNDWIG rolling mill roll system diagram is the distance O between the center position of the first intermediate roll and the left and right center lines of the rolling mill;

[0020] S2. Analyze the roll matching diagram data of the first intermediate roll neck fracture accident of SUNDWIG rolling mill;

[0021] S3. Analyze the data of the suspension structure diagram of the bearing seat on the driving side of the first intermediate roll of the SUNDWIG rolling mill, and obtain the distance d1 between the left and right center lines of the rolling mill and the center line of the left outer ring, the radius r1 of the left inner hole, the distance d2 between the center line of the left inner hole and the center line of the right outer ring, and the distance d3 between the center line of the left outer ring and the center line of the right outer ring;

[0022] S4. Analyze the structural data of the bearing seat on the transmission side of the first intermediate roll of the SUNDWIG rolling mill to obtain the radius r of the bearing seat on the transmission side of the first intermediate roll;

[0023] S5. Calculate the minimum value Omin of the "O" value, compare the O value with the Omin value, and if the O value is less than the Omin value, control the O value to be within the range of the maximum and minimum values.

[0024] In step S2, the "O" value in the roll matching diagram of the first intermediate roll neck fracture accident of the SUNDWIG rolling mill is affected by the changes in the diameters of the rolls of the roll system, and can be automatically calculated by the roll matching software. In one of the actual roll matching diagrams of the first intermediate roll neck fracture accident of the SUNDWIG rolling mill, the calculated value of the O value is 55.731mm, at which time the diameter of the second intermediate drive roll is 198mm (the maximum value of the roll range), the diameter of the upper driven roll is 198.18mm (relatively small), and the diameter of the first intermediate roll is 109.95mm, and no error message is raised on the roll matching screen.

[0025] In step S3, the first intermediate roller bearing seat suspension structure of the above-mentioned SUNDWIG rolling mill is located on the transmission side of the upper arch of the rolling mill. The set of structures consists of two suspensions with an inner hole radius of 41.5 mm and an outer radius of 51.5 mm. This structure is an eccentric structure, and the left and right inner hole processing and left and right outer ring processing center points are different. It is necessary to calculate the center line of the bearing seat installed in the suspension to the left and right center lines of the rolling mill (equivalent to the center line of the suspension structure).

[0026] In step S5, the diameter of the first intermediate roll drive side bearing seat in the first intermediate roll drive side bearing seat structure of the SUNDWIG rolling mill is 85mm, the radius is R42.5mm, and the calculation formula of Omin is Omin=r+(d1-(r1+(d2-d3))), and the Omin value is 57.5mm. At this time, the O value is less than the Omin value. Due to the shortcomings of the roll matching software, the first intermediate roll neck and suspension are broken without abnormal information prompts after the roll matching.

[0027] This embodiment fundamentally solves the problem of the first intermediate roll neck fracture accident through the above method. During the roll matching process, the "O" value of the first intermediate roll of the upper roll system is confirmed to ensure that the "O" value is controlled within 58mm (in order to ensure the safety size, 0.5mm is added on the basis of Omin) < O value < 64mm (the maximum value, which can be automatically calculated by the roll matching software).

[0028] By limiting the lower limit of the spatial position of the first intermediate roll, after the implementation of this method, no first intermediate roll neck fracture accident occurred in the SUNDWIG rolling mill. This method can be promoted and used in other units and is fully applicable to similar enterprises and similar equipment conditions.

Claims

1. A control method for preventing the first intermediate roll neck of a rolling mill from breaking, characterized in that: The following steps are involved: S1. Confirm the position of "O" value in the SUNDWIG rolling mill roll system diagram; S2. Analyze the roll matching data of the first intermediate roll neck fracture accident of SUNDWIG rolling mill; S3. Analyze the data of the suspension structure diagram of the bearing seat on the driving side of the first intermediate roll of the SUNDWIG rolling mill, and obtain the distance d1 between the left and right center lines of the rolling mill and the center line of the left outer ring, the radius r1 of the left inner hole, the distance d2 between the center line of the left inner hole and the center line of the right outer ring, and the distance d3 between the center line of the left outer ring and the center line of the right outer ring; S4. Analyze the structural data of the bearing seat on the transmission side of the first intermediate roll of the SUNDWIG rolling mill to obtain the radius r of the bearing seat on the transmission side of the first intermediate roll; S5. Calculate the minimum value Omin of the "O" value, compare the O value with the Omin value, and if the O value is less than the Omin value, control the O value within the range of the maximum and minimum values.

2. The control method for preventing the first intermediate roll neck of a rolling mill from breaking according to claim 1, characterized in that: In step S1, the value "O" in the SUNDWIG rolling mill roll diagram is the distance O between the center position of the first intermediate roll and the left and right center lines of the rolling mill.

3. The control method for preventing the first intermediate roll neck of a rolling mill from breaking according to claim 1, characterized in that: In the step S2, the "O" value in the roll matching diagram of the first intermediate roll neck fracture accident of the SUNDWIG rolling mill is affected by the changes in the diameters of the rolls in the roll system and can be automatically calculated by the roll matching software.

4. The control method for preventing the first intermediate roll neck of a rolling mill from breaking according to claim 3 is characterized in that: The maximum value of the O value is the O value automatically calculated by the roll matching software.

5. The control method for preventing the first intermediate roll neck of a rolling mill from breaking according to claim 1, characterized in that: In step S5, the calculation formula of Omin is Omin=r+(d1-(r1+(d2-d3))).

Images