Method for eliminating the drop-out of the lettering area of the UF roller of a steel rail
By calculating and controlling the roll bite position, the low-temperature zone at the beginning and end of the rail is prevented from contacting the marking area on the roll, thus solving the problem of roll breakage and improving the quality and efficiency of rail production.
Patent Information
- Application Number
- CN202310723449.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-19
- Publication Date
- 2025-12-05
- Estimated Expiration
- 2043-06-19
AI Technical Summary
During the rolling process, the lettering area on the rolls is prone to chipping due to the impact between the low-temperature zones at the beginning and end of the rail and the rolls, leading to premature scrapping of the UF rolls and surface quality problems on the rail.
By calculating and controlling the contact position between the rail end and the roll marking area during roll bite and tail swing, impacts are avoided. Specific steps include setting the calibration zero point each time the UF roll is replaced, dividing the area along the roll circumference, controlling the rail bite position, and ensuring that the roll marking area avoids the low temperature zone.
This effectively prevents chips from falling off the markings on the rolls, extends the service life of UF rolls, and improves the surface quality of rails and production efficiency.
Smart Images
Figure CN116871330B_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to a method for eliminating block drop in the lettering area of a UF roll for a steel rail, and belongs to the technical field of steel rolling methods in the metallurgical industry. BACKGROUND
[0002] During the production of a steel rail, a hot-rolled mark is rolled at the rail waist position of the steel rail by a hot-rolling method. The height, depth, and spacing of the hot-rolled mark are clearly required in the relevant production standards of the steel rail. When a steel rail is produced by a steel rail production plant, the required hot-rolled mark is concavely engraved at the rail waist position of the finished roll. After the steel rail is hot-rolled by the finished roll, a clear hot-rolled mark can be hot-rolled on the rail waist of the steel rail. Since the rail head of the steel rail is bitten into the roll for an instant, the position where the steel rail contacts the roll cannot be fixed, and the phenomenon that the rail head of the steel rail collides with the lettering area of the roll occurs. Since the rail head is reciprocally rolled into the roll in the rolling mill, it is greatly affected by the cooling water, and the temperature of the rail head and tail is low. At the same time, there are edges on the edges of the lettering font of the roll. After the collision of the two, the edges of the lettering font of the roll are easily dropped, which will cause abnormal protrusions near the hot-rolled mark of the rail waist of the steel rail, the hot-rolled font is not clear, and the production requirements cannot be met. At this time, the rolling line needs to replace the UF roll, which seriously affects the product quality and production efficiency of the steel rail. SUMMARY
[0003] The purpose of the present application is to provide a method for eliminating block drop in the lettering area of a UF roll for a steel rail. By calculating and controlling the contact position between the end of the steel rail and the lettering area of the roll when the roll is bitten and the tail is thrown, the problem of block drop in the lettering area caused by the collision between the low-temperature area of the rail head and tail and the lettering area of the roll can be avoided, the UF roll is prematurely scrapped due to the collision of the end of the steel rail, and the batch surface quality problem caused thereby is eliminated, and the above-mentioned problems existing in the background art are effectively solved.
[0004] The technical scheme of the present application is: a method for eliminating block drop in the lettering area of a UF roll for a steel rail, comprising the following steps:
[0005] (1) When the UF roll is replaced each time, the starting point position of the lettering area of the roll is placed at the lowest point in the rolling direction, and the system takes this point as the calibration zero point;
[0006] (2) Determine the diameter of the UF roll, divide the UF roll into four segments along the circumference, and the lettering area of the roll occupies one of the segments. When the steel rail enters the UF roll, control the biting position of the steel rail to avoid the contact between the low-temperature area of the rail head and tail and the lettering area of the roll;
[0007] (3) Determine the circular arc distance between the biting position of the steel rail into the roll and the calibration zero point in the rolling direction;
[0008] (4) Determine the distance between the biting start position and the biting position of the roll in the rolling direction.
[0009] (5) further determine the distance between the calibration zero point and the bite start position along the rolling direction of the roll;
[0010] (6) before each bite start procedure of the UF roll, according to the above data operation, the bite start position is rotated to the lowest point according to the system calibration zero point.
[0011] In the step (2), the UF roll diameter D is divided into four segments along the circumference direction, the position of the engraved characters is the roll engraved character area, and the length is , and the other three segments are the roll non-engraved character area, and the total length is ; the length of the engraved characters of the roll is M, , wherein 1040mm≤D≤1200mm, that is, M≤the length of the roll engraved character area; when the rail enters the UF roll, the length of the head and tail low temperature zone is <500mm, and by controlling the bite position of the rail, the 500mm area at the head and tail end of the rail is avoided from contacting the roll engraved character area.
[0012] In the step (3), the length of the rail in front of the UF rolling mill is L, wherein L is provided by the TCS of the previous rolling mill, , a is an integer, when , the circular arc distance between the bite position of the roll and the calibration zero point along the rolling direction of the roll is ; when , the circular arc distance between the bite position of the roll and the calibration zero point along the rolling direction of the roll is S=0, that is, the bite position of the roll coincides with the calibration zero point.
[0013] In the step (4), the bite speed of the UF roll is V1, the distance from the roll when the rail starts to bite the hole type of the UF roll is S2, , the rail travel speed is V2, the time required for the rail to start to bite to contact the roll is T2=S2 / V2, the circular arc distance between the bite position of the roll and the bite start position along the rolling direction of the roll is S1=T2*V1, wherein V1 is the linear speed of the outer circle of the roll set by the system, and S2 and V2 are set by the system.
[0014] (5) further determine the distance X between the calibration zero point and the bite start position along the rolling direction of the roll;
[0015] when , ;
[0016] when , .
[0017] The beneficial effects of the present application are: by calculating and controlling the contact position of the rail end and the rolling mill engraved area when the rolling mill bites and flails, the problem of the engraved area falling off caused by the impact of the low temperature area of the rail head and tail with the rolling mill engraved area can be avoided, and the UF rolling mill is prematurely scrapped due to the impact of the rail end, and the batch rail surface quality problem caused thereby is eliminated. BRIEF DESCRIPTION OF DRAWINGS
[0018] Figure 1 is the rolling mill circumference division and zero point calibration schematic diagram of the present application;
[0019] Figure 2 is the bite start position schematic diagram of the present application when ;
[0020] Figure 3 is the bite start position schematic diagram of the present application when ;
[0021] In the figure: UF rolling mill 1, rolling direction 2, rolling rotation direction 3, rolling mill engraved area A1, rolling mill non-engraved area one A2, rolling mill non-engraved area two A3, rolling mill non-engraved area three A4, calibration zero point K0, start position K1, bite rolling mill position K2. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical scheme and advantages of the embodiment of the application clearer, the technical scheme of the embodiment of the application will be clearly and completely described below in combination with the drawings in the embodiment. Obviously, the described embodiment is only a part of the embodiments of the application, not all the embodiments of the application. Based on the embodiment of the application, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the application.
[0023] A method for eliminating the engraved area falling off of the UF rolling mill of the rail, comprising the following steps:
[0024] (1) When the UF rolling mill is replaced each time, the starting point position of the rolling mill engraved area is placed at the lowest point along the rolling direction, and the system takes this point as the calibration zero point;
[0025] (2) The diameter of the UF rolling mill is determined, the UF rolling mill is evenly divided into four segments along the circumference direction, the rolling mill engraved area occupies one of the segments, and when the rail enters the UF rolling mill, the rail bite position is controlled to avoid the contact of the low temperature area of the rail head and tail with the rolling mill engraved area;
[0026] (3) Along the rolling rotation direction, the circular arc distance between the rail bite rolling mill position and the calibration zero point is determined;
[0027] (4) Along the rolling rotation direction, the distance between the bite start position and the bite rolling mill position is determined;
[0028] (5) further determine the distance between the calibration zero point and the bite start position along the rolling direction of the roller;
[0029] (6) before each bite start procedure of the UF roller, according to the above data operation, the bite start position is rotated to the lowest point according to the system calibration zero point.
[0030] In the step (2), the UF roller diameter D is divided into four sections along the circumferential direction, the position of the engraved characters is the roller engraved character area, and the length is , and the other three sections are the roller non-engraved character area, and the total length is ; the length of the engraved characters of the roller is M, , wherein 1040mm≤D≤1200mm, that is, M≤the length of the roller engraved character area; when the rail enters the UF roller, the length of the head and tail low-temperature zone is <500mm, and by controlling the bite position of the rail, the 500mm area at the head and tail end of the rail is avoided from being in contact with the roller engraved character area.
[0031] In the step (3), the length of the rail in front of the UF rolling mill is L, wherein L is provided by the TCS of the previous rolling mill, , a is an integer, when , the circular arc distance between the bite position of the roller and the calibration zero point along the rolling direction of the roller is S=0, that is, the bite position of the roller coincides with the calibration zero point. ; when , the circular arc distance between the bite position of the roller and the calibration zero point along the rolling direction of the roller is S=0, that is, the bite position of the roller coincides with the calibration zero point.
[0032] In the step (4), the bite speed of the UF roller is V1, the distance S2 between the rail and the roller when the rail starts to bite into the hole type of the UF roller is , the rail advancing speed is V2, the time T2 required for the rail to start to bite into the hole type of the UF roller is T2=S2 / V2, the circular arc distance S1 between the bite position of the roller and the bite start position along the rolling direction of the roller is S1=T2*V1, wherein V1 is the linear speed of the outer circle of the roller set by the system, and S2 and V2 are set by the system.
[0033] In the step (5), the distance X between the calibration zero point and the bite start position along the rolling direction of the roller is:
[0034] When , ;
[0035] When , .
[0036] In practical application, the present application comprises the following steps:
[0037] (1) each time the UF roll 1 is replaced, the starting point of the roll lettering area A1 is placed at the lowest point in the rolling direction, and the system takes this point as the calibration zero point K0;
[0038] (2) the UF roll 1 diameter D is determined, the UF roll 1 is evenly divided into four segments along the circumference, the position of the lettering is the roll lettering area A1, the length is , and the other three segments are the roll non-lettering area A2, the roll non-lettering area A3, and the roll non-lettering area A4, and the total length is . The length of the characters engraved on the roll is M, (1040mm≤D≤1200mm), that is, M≤the length of the roll lettering area A1. When the rail enters the UF roll 1, the length of the head and tail low-temperature zone is <500mm, and only the control of the rail bite position is needed to avoid the 500mm area at the head and tail end of the rail from contacting the roll lettering area A1;
[0039] (3) the circular arc distance K2K0 between the rail bite roll position K2 and the calibration zero point K0 is determined in the UF roll 1 rotation direction. The length of the rail in front of the UF rolling mill is L (L is provided by the TCS of the previous rolling mill), , a is an integer, when , the circular arc distance K2K0 between the rail bite roll position K2 and the calibration zero point K0 in the UF roll 1 rotation direction is , when , the circular arc distance K2K0 between the rail bite roll position K2 and the calibration zero point K0 in the UF roll 1 rotation direction is K2K0=0, that is, the two points K2 and K0 coincide;
[0040] (4) the distance between the bite start position K1 and the bite roll position K2 is determined in the UF roll 1 rotation direction. The UF roll 1 bite speed is V (the outer circular line speed of the roll 1, which is set by the system), the distance from the roll when the rail starts to bite the UF roll 1 pass is S2 (which is set by the system), , the rail travel speed is V2 (which is set by the system), and the time required for the rail to start to bite to contact the roll is T2=S2 / V2. The circular arc distance K2K1 between the rail bite roll position K2 and the bite start position K1 in the UF roll 1 rotation direction is K2K1=T2*V1;
[0041] (5) since the calibration zero point K0 is a position determined in the system, the distance K0K1 between the calibration zero point K0 and the bite start position K1 in the UF roll 1 rotation direction needs to be further determined:
[0042] when , ;
[0043] when , .
[0044] Before each start-up of the bite procedure, the system automatically rotates the bite start-up position K1 to the lowest point according to the system calibration zero point K0 based on the above data calculation. When the rail bites into the roll pass, the roll lettering area A1 can successfully avoid the low temperature zone of 500 mm at the head and tail of the rail. Example 1
[0045] When the UF roll is replaced for roll calibration, the calibration zero point K0 has been set. Assuming that the length of the rail in front of the UF rolling mill is L = 96000 mm, the roll diameter D = 1200 mm, the bite speed of the UF roll 1 is V1 = 1 m / s, and the distance of the rail from the roll when the rail starts to bite into the pass of the UF roll 1 is S2 = 2 m, the rail travel speed is V2 = 1 m / s.
[0046] Along the rotation direction of the UF roll 1, the circular arc distance K2K0 between the rail bite position K2 and the calibration zero point K0 is determined, Because K0K1 = (S2 / V2)*V1 = 2000 mm.
[0047] Before each start-up of the bite procedure, the system automatically rotates the bite start-up position K1 to the lowest point according to the system calibration zero point K0 based on the above data calculation. When the rail bites into the roll pass, the roll lettering area A1 can successfully avoid the low temperature zone of 500 mm at the head and tail of the rail. Example 2
[0048] When the UF roll is replaced for roll calibration, the calibration zero point K0 has been set. Assuming that the length of the rail in front of the UF rolling mill is L = 97500 mm, the roll diameter D = 1200 mm, the bite speed of the UF roll 1 is V1 = 1 m / s, and the distance of the rail from the roll when the rail starts to bite into the pass of the UF roll 1 is S2 = 2 m, the rail travel speed is V2 = 1 m / s.
[0049] Along the rotation direction of the UF roll 1, the circular arc distance K2K0 between the rail bite position K2 and the calibration zero point K0 is determined, Because Therefore .
[0050] Before each start-up of the bite procedure, the system automatically rotates the bite start-up position K1 to the lowest point according to the system calibration zero point K0 based on the above data calculation. When the rail bites into the roll pass, the roll lettering area A1 can successfully avoid the low temperature zone of 500 mm at the head and tail of the rail.
Claims
1. A method for eliminating the drop-out of the lettering area of a steel rail UF roll, characterized in that Comprising the following steps: (1) When the UF roll is replaced each time, the starting point position of the roll lettering area in the rolling direction is placed at the lowest point, and the system takes this point as the calibration zero point; (2) Determine the UF roll diameter, divide the UF roll into four segments along the circumference, and the roll lettering area occupies one of the segments; when the rail enters the UF roll, control the rail bite position to avoid the low-temperature zone at the head and tail of the rail from contacting the roll lettering area; (3) determining the arc distance between the biting-in position of the rail and the calibration zero point in the rolling direction of the roll; the length of the rail in front of the UF rolling mill is L, wherein L is provided by the previous rolling mill TCS, a is an integer, when , the arc distance S between the biting-in position of the rail and the calibration zero point in the rolling direction of the roll is ; when , the arc distance S between the biting-in position of the rail and the calibration zero point in the rolling direction of the roll is 0, that is, the biting-in position of the rail coincides with the calibration zero point; (4) along the rolling direction of the roll, the distance between the bite starting position and the bite roll position is determined; the bite speed of the UF roll is V1, the distance from the roll when the rail starts to bite the hole of the UF roll is S2, , the rail running speed is V2, the time required for the rail to start to bite to contact the roll is T2=S2 / V2, and the circular distance S1=T2*V1 between the bite roll position and the bite starting position along the rolling direction of the roll. (5) Further determine the distance X between the calibration zero point and the bite start position in the rolling direction: When Time, ; When Time, ; (6) Before each start of the bite program of the UF roll, according to the above data operation, rotate the bite start position to the lowest point according to the system calibration zero point.
2. The method of claim 1, wherein: In the step (2), the UF roll diameter D is divided into four sections along the circumferential direction, the position of the characters is the character-etched area of the roll, and the length is The other three sections are non-character-etched areas of the roll, and the total length is The length of the characters etched on the roll is M, where 1040 mm≤D≤1200 mm, i.e. M≤the length of the character-etched area of the roll; when the rail enters the UF roll, the length of the head and tail low-temperature zones is <500 mm, and by controlling the biting position of the rail, the 500 mm area at the head and tail ends of the rail is prevented from contacting the character-etched area of the roll.
3. The method of claim 1, wherein: In step (4), V1 is the roll outer circle linear speed set by the system, and S2 and V2 are set by the system.
Citation Information
Patent Citations
Online rolling method for hot-rolled H-shaped steel
CN114871269A
Marking method for rail trade mark
CN1290578A