阅读说明：本技术 一种开坯机推床标定方法 (Cogging mill push machine calibration method ) 是由 朱叶 刘永 赵景存 于 2021-07-27 设计创作，主要内容包括：本发明涉及一种开坯机推床标定方法,属于轧钢工艺技术领域。本发明的技术方案是：开坯轧制前进行推床两端初始位置标定；模拟轧制到某一个轧槽位置进行推床两端位置标定；重复以上步骤,再次模拟轧制确认推床实际位置与位移传感器显示数值＜3mm时,可以进行轧制。本发明的有益效果是：目标压下量＞70mm,以实际状态为参考,每班生产前均进行推床的位置标定,操作性强,工具易于得到,投资小,精度高,实现了精确标定开坯机推床挡板,提高了轧制的精度,减少了因脱方导致轧甩问题。(The invention relates to a method for calibrating a push machine of a cogging mill, belonging to the technical field of steel rolling processes. The technical scheme of the invention is as follows: calibrating initial positions of two ends of a pusher before cogging and rolling; simulating rolling to a certain rolling groove position to calibrate the positions of the two ends of the pusher; and repeating the steps, and performing rolling when simulating rolling again to confirm that the actual position of the pusher and the display value of the displacement sensor are less than 3 mm. The invention has the beneficial effects that: the target reduction is more than 70mm, the actual state is used as a reference, the position calibration of the pusher is carried out before each production, the operability is strong, the tools are easy to obtain, the investment is small, the precision is high, the precise calibration of the pusher baffle of the cogging mill is realized, the rolling precision is improved, and the problem of rolling and throwing caused by stripping is reduced.)

1. A cogging mill push machine calibration method is characterized by comprising the following steps:

(1) initial position calibration: opening the manipulator baffle plate to the maximum opening before rolling, wherein the manipulator baffle plates on two sides are larger than the roller body of the roller, horizontally leaning against the edge of the roller surface on the operation side of the roller by adopting a first straight steel ruler, aligning the second zero position of the first straight steel ruler to the front end of the manipulator baffle plate, measuring the distance A1 between the manipulator baffle plate and one end of the roller, determining the actual manipulator position, and correcting the display value X1 of a displacement sensor by utilizing the value A1 so that X1= -A1;

(2) calibrating a baffle of a pusher at the other end by adopting the step (1), measuring the distance A2 between the baffle of the pusher and the transmission side of the roller, determining the position of the actual pusher, and correcting the display value X2 of the displacement sensor by using the value A2 so that X2= the length L + A2 of the roller body of the roller;

(3) after the initial position is calibrated, starting the material-free simulation rolling, when the automatic simulation rolling is carried out for a certain time, after the pusher baffle is automatically aligned with the rolling groove, before the pusher baffle is bitten, stopping the automatic mode, and changing the automatic mode into a manual mode: one end to be calibrated is fixed, and the baffle of the push bed at the other end is manually opened; horizontally placing the first straight steel ruler on the upper cross beam, aligning the front end of the first straight steel ruler to the inner side 1/2 of the excircle angle of the rolling groove, and using a square to measure so that the first straight steel ruler is perpendicular to the upper cross beam; aligning the two zero positions of the steel ruler to the front end of a baffle of the pusher, measuring the distance A3 between the baffle of the pusher and the operation side of the rolling groove, determining the position of the actual pusher, correcting the display value X3 of the displacement sensor by using the value A3, and completing the calibration, wherein the X3- (the position Ln of the central line of the rolling groove-one half Bk/2-A3 of the width of the rolling groove) is less than 3 mm;

(4) calibrating a push bench baffle at the other end by adopting the step (3), measuring the distance A4 between the push bench baffle and the transmission side of the rolling groove, determining the actual push bench position, correcting the display value X4 of the displacement sensor by utilizing the value A4, and enabling the X4- (the position Ln of the central line of the rolling groove and one half Bk/2+ A4 of the width of the rolling groove) to be less than 3mm, thus completing the calibration;

(5) and repeating the steps, and performing rolling when simulating rolling again to confirm that the actual position of the pusher and the display value of the displacement sensor are less than 3 mm.

Technical Field

The invention relates to a method for calibrating a push machine of a cogging mill, belonging to the technical field of steel rolling processes.

Background

From a cogging mill with the diameter of 750mm to a cogging mill with the diameter of 1350mm, in order to match the billet to be accurately aligned with the rolling groove during each rolling pass, a pusher is generally arranged in front of, behind or in front of the cogging mill, so that the billet can be conveniently switched among various hole patterns. According to the degree of automation, each production plant has an automatic operation mode and a manual operation mode of the manipulator. In the reciprocating cogging mill, the baffle at the front end of the pusher is equivalent to an inlet guide of a continuous rolling mill group, and the center line of the openings of the two baffles is aligned with the center line of the rolling groove in the blank feeding process, so that the head of the intermediate blank can be ensured not to be bent laterally. When the pressing amount is larger than 70mm, the risk of steel falling caused by unequal pressing amounts of two sides of the intermediate billet is reduced. The movement of the manipulator adopts a displacement control mode, namely, one end of the roller body of the secondary roller is a zero position, the other end of the roller body is the length of the roller body, the central line of the opening degree of the front baffle plate of the manipulator before rolling of each pass is aligned with the central line of a rolled material, and the control precision strictly depends on the manipulator precision, so that the manipulator calibration is a crucial link for better realizing the auxiliary gripping function of the manipulator. Whether the stable engagement can be accurately implemented is directly related to the centering of the manipulator, namely the calibration accuracy of the manipulator. If the calibration of the pusher is unreliable, the steel is inverted during rolling, once steel is inverted in one pass, the subsequent passes of rolling cannot be improved, finally the appearance is unqualified, and the rolling of a continuous rolling unit cannot be performed, so that the rolling waste is caused. Moreover, a series of production quality accidents such as groove cracking or steel clamping can be caused. And serious restrictions are brought to the production, research and development of high-grade special steel products. The aim of the calibration of the manipulator is to find the corresponding relation between the reading of the displacement sensor and the actual positions of the two baffle plates of the manipulator, so that the opening degree of the manipulator can be accurately obtained according to the position of the displacement sensor. At present, the calibration of a manipulator is mainly that before rolling, human eyes are adopted for observation, a front baffle of the manipulator is aligned with one end of a roller, the reading of a displacement sensor is set to be a zero position, the other side baffle is aligned with the other end of the roller, and the numerical value of the displacement sensor is set to be the length of a roller body. Because the mechanical movement of the pusher drives the disc spring behind the baffle by the chain, and friction exists between the mechanical movements, the centering performance of the pusher is changed in the early stage and the later stage of calibration, the consistency with the actual production state cannot be ensured, and the measurement precision is poor. Therefore, the existing calibration mode cannot ensure the calibration precision and the product quality.

Disclosure of Invention

The invention aims to provide a method for calibrating a push lathe of a cogging mill, which has the target rolling reduction of more than 70mm, takes the actual state as reference, calibrates the position of the push lathe before each production, has strong operability, easily obtained tools, small investment and high precision, realizes the precise calibration of a push lathe baffle of the cogging mill, improves the rolling precision, reduces the problem of rolling and throwing caused by stripping, and effectively solves the problems in the background technology.

The technical scheme of the invention is as follows: a cogging mill push machine calibration method comprises the following steps:

(1) initial position calibration: opening the manipulator baffle plate to the maximum opening before rolling, wherein the manipulator baffle plates on two sides are larger than the roller body of the roller, horizontally leaning against the edge of the roller surface on the operation side of the roller by adopting a first straight steel ruler, aligning the second zero position of the first straight steel ruler to the front end of the manipulator baffle plate, measuring the distance A1 between the manipulator baffle plate and one end of the roller, determining the actual manipulator position, and correcting the display value X1 of a displacement sensor by utilizing the value A1 so that X1= -A1;

(2) calibrating a baffle of a pusher at the other end by adopting the step (1), measuring the distance A2 between the baffle of the pusher and the transmission side of the roller, determining the position of the actual pusher, and correcting the display value X2 of the displacement sensor by using the value A2 so that X2= the length L + A2 of the roller body of the roller;

(3) after the initial position is calibrated, starting the material-free simulation rolling, when the automatic simulation rolling is carried out for a certain time, after the pusher baffle is automatically aligned with the rolling groove, before the pusher baffle is bitten, stopping the automatic mode, and changing the automatic mode into a manual mode: one end to be calibrated is fixed, and the baffle of the push bed at the other end is manually opened; horizontally placing the first straight steel ruler on the upper cross beam, aligning the front end of the first straight steel ruler to the inner side 1/2 of the excircle angle of the rolling groove, and using a square to measure so that the first straight steel ruler is perpendicular to the upper cross beam; aligning the two zero positions of the steel ruler to the front end of a baffle of the pusher, measuring the distance A3 between the baffle of the pusher and the operation side of the rolling groove, determining the position of the actual pusher, correcting the display value X3 of the displacement sensor by using the value A3, and completing the calibration, wherein the X3- (the position Ln of the central line of the rolling groove-one half Bk/2-A3 of the width of the rolling groove) is less than 3 mm;

(4) calibrating a push bench baffle at the other end by adopting the step (3), measuring the distance A4 between the push bench baffle and the transmission side of the rolling groove, determining the actual push bench position, correcting the display value X4 of the displacement sensor by utilizing the value A4, and enabling the X4- (the position Ln of the central line of the rolling groove and one half Bk/2+ A4 of the width of the rolling groove) to be less than 3mm, thus completing the calibration;

(5) and repeating the steps, and performing rolling when simulating rolling again to confirm that the actual position of the pusher and the display value of the displacement sensor are less than 3 mm.

The invention has the beneficial effects that: the target reduction is more than 70mm, the actual state is used as a reference, the position calibration of the pusher is carried out before each production, the operability is strong, the tools are easy to obtain, the investment is small, the precision is high, the precise calibration of the pusher baffle of the cogging mill is realized, the rolling precision is improved, and the problem of rolling and throwing caused by stripping is reduced.

Drawings

FIG. 1 is a schematic view of the construction of the present invention;

FIG. 2 is a schematic view of the initial position calibration in step (1) of the present invention;

FIG. 3 is a schematic view of the initial position calibration in step (2) of the present invention;

FIG. 4 is a schematic diagram of the calibration of the simulated rolling to a certain rolling groove position in step (3) of the present invention;

FIG. 5 is a schematic diagram of the calibration of the simulated rolling to a certain rolling groove position in step (4) of the present invention;

FIG. 6 is a schematic view of the alignment of the pusher mechanism with the No. 2 rolling groove when the die rolls to a certain pass;

FIG. 7 is a diagram of a rolled product of the present invention;

FIG. 8 is a diagram of a finished product of the present invention that has not been rolled successfully;

in the figure: the device comprises a push bench 1, a tilter 2, a drag chain 3, a displacement sensor 4, a transmission mechanism 5, a push head 6, a buffer disc spring 7, a buffer beam 8, a drag chain 9, a rolling groove central line 10, a rolling surface edge 11 of a roller, a first steel ruler 12, a lower cross beam 13, a second steel ruler 14, a push bench baffle 15, a roller body length 16, an upper cross beam 17, a square 18, a rolling groove width 19, a roller 20 and a roller central line 21.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.

A cogging mill push machine calibration method comprises the following steps:

(1) initial position calibration: opening the manipulator baffle plate to the maximum opening before rolling, wherein the manipulator baffle plates on two sides are larger than the roller body of the roller, horizontally leaning against the edge of the roller surface on the operation side of the roller by adopting a first straight steel ruler, aligning the second zero position of the first straight steel ruler to the front end of the manipulator baffle plate, measuring the distance A1 between the manipulator baffle plate and one end of the roller, determining the actual manipulator position, and correcting the display value X1 of a displacement sensor by utilizing the value A1 so that X1= -A1;

(2) calibrating a baffle of a pusher at the other end by adopting the step (1), measuring the distance A2 between the baffle of the pusher and the transmission side of the roller, determining the position of the actual pusher, and correcting the display value X2 of the displacement sensor by using the value A2 so that X2= the length L + A2 of the roller body of the roller;

(3) after the initial position is calibrated, starting the material-free simulation rolling, when the automatic simulation rolling is carried out for a certain time, after the pusher baffle is automatically aligned with the rolling groove, before the pusher baffle is bitten, stopping the automatic mode, and changing the automatic mode into a manual mode: one end to be calibrated is fixed, and the baffle of the push bed at the other end is manually opened; horizontally placing the first straight steel ruler on the upper cross beam, aligning the front end of the first straight steel ruler to the inner side 1/2 of the excircle angle of the rolling groove, and using a square to measure so that the first straight steel ruler is perpendicular to the upper cross beam; aligning the two zero positions of the steel ruler to the front end of a baffle of the pusher, measuring the distance A3 between the baffle of the pusher and the operation side of the rolling groove, determining the position of the actual pusher, correcting the display value X3 of the displacement sensor by using the value A3, and completing the calibration, wherein the X3- (the position Ln of the central line of the rolling groove-one half Bk/2-A3 of the width of the rolling groove) is less than 3 mm;

(4) calibrating a push bench baffle at the other end by adopting the step (3), measuring the distance A4 between the push bench baffle and the transmission side of the rolling groove, determining the actual push bench position, correcting the display value X4 of the displacement sensor by utilizing the value A4, and enabling the X4- (the position Ln of the central line of the rolling groove and one half Bk/2+ A4 of the width of the rolling groove) to be less than 3mm, thus completing the calibration;

(5) and repeating the steps, and performing rolling when simulating rolling again to confirm that the actual position of the pusher and the display value of the displacement sensor are less than 3 mm.

Example (b):

1) calibration of front pusher of cogging mill at initial position

The calibration principle refers to the measurement principle of a screw micrometer and a vernier caliper of a precision measuring tool. Stopping the manipulator baffle outside the edge of the roller, opening the manipulator baffle to the maximum opening, wherein the opening degree of the manipulator baffle at two sides is larger than the roller body of the roller, and horizontally holding the front end of the straight steel ruler against the edge of the roller surface at the operation side of the roller in the horizontal direction to keep the straight steel ruler horizontal and vertical to the lower cross beam. And aligning the two zero positions of the steel ruler to the front end of the baffle of the pusher, measuring the distance A1 between the baffle of the pusher and one end of the roller, determining the actual position of the pusher, assigning the position value of the actually measured baffle of the pusher to the display value X1 of the displacement sensor, so that X1= -A1, and completing the calibration of the front pusher of the cogging mill at the initial position. The method is used for repeatedly measuring three times, namely the position value of the baffle plate of the manipulator is considered to be consistent with the display value of the displacement sensor, and the baffle plate of the manipulator cannot ensure an absolute zero position, so that the measurement error in the measurement is reduced as much as possible by repeatedly measuring three times. The deformation of the disc spring and the friction between the devices (main error generating positions) and the size error generated by the device installation clearance during the operation of the mechanical device are eliminated.

2) By adopting the steps, the manipulator baffle at the other end of the manipulator is calibrated, the distance A2 between the manipulator baffle and the transmission side of the roller is measured, the actual manipulator position is determined, and the display value X2 of the displacement sensor is corrected by using the value A2, so that X2= the roller body length L + A2. The calibration data of the baffle position of the front pusher of the initial position cogging mill are shown in table 1. The roll body length L =2400 mm.

TABLE 1

3) Calibration by simulating rolling

When the automatic simulation rolling is carried out for a certain time, after the pusher baffle is automatically aligned with the rolling groove, and before the pusher baffle is not bitten, the automatic mode is terminated. And changing the mode into a manual mode, fixing one end to be calibrated, and manually opening the baffle of the push bed at the other end. Horizontally placing the straight steel ruler on the upper cross beam of the rolling mill, aligning the front end of the straight steel ruler to the inner side 1/2 of the excircle corner of the rolling groove, considering that the billet has thermal expansion after being heated, and the excircle corner of the rolling grooveThe inboard side 1/2 is considered the groove width. Measuring with a square ruler to make the first straight steel ruler perpendicular to the upper crossbeam of the rolling mill, aligning the second straight steel ruler zero position to the front end of the push bench baffle, measuring the distance A3 between the push bench baffle and the operation side of the notch of the rolling groove, determining the actual push bench position, and correcting the display value X3 of the displacement sensor by using the A3 value to make X3- (the central line position L of the rolling groove)_nHalf the width of the groove B_k/2-A3) < 3 mm. The method is used for repeatedly measuring three times, namely the position value of the baffle of the manipulator and the display value of the displacement sensor tend to be consistent without large fluctuation, and the previous calibration is considered to be successful.

4) Calibrating the other end of the manipulator baffle plate, measuring the distance A4 between the manipulator baffle plate and the transmission side of the groove, determining the actual manipulator position, and correcting the display value X4 of the displacement sensor by using the A4 value to ensure that X4 is equal to the groove center line position L_nPlus one half of the width of the rolling groove B_kAnd/2 + A4) < 3mm, and the calibration is completed. The calibration data of the baffle position of the front push machine of the simulated rolling cogging mill are shown in the table 2. As shown in particular in fig. 4 and 5. The position Ln =1210mm of the center line of the groove, and one half Bk/2=216mm of the width of No. 2 groove.

TABLE 2

5) Trial rolling verification

After the front pusher of the cogging mill is calibrated, selecting in-plant debugging billets for testing, and managing test materials independently to circulate normally. The production class is responsible for recording data such as current, torque and the like during each pass of rolling, measuring the surface temperature of the intermediate billet, stopping the automatic mode when a certain pass of rolling is reached, measuring the material type of the intermediate billet in a certain pass, and making records by process personnel. And measuring the size of the finished product after the intermediate blank is formed. The rolled finished product is shown in figure 7, and the finished product which is not rolled successfully is shown in figure 8.