RU2037378C1 - Device for controlling surface defects of hot blank at castings - Google Patents

Abstract

FIELD: metallurgy. SUBSTANCE: device has frame 1, cylindrical pickup 2 whose axis is perpendicular to the surface to be controlled, scanning unit 5 which includes guides 6 parallel to the blank surface to be controlled and perpendicular to its axis and mounted in the guides to permit carriage 8 with the pickup to be movable, drive 9 for moving carriage, and recording equipment 10. The device has second cylindrical pickup 3 whose axis perpendicular to the surface to be controlled. The scanning unit additionally has carriage 11 mounted to allow wheels 12 to be in contact with the blank surface. The carriage is pivotally connected to the frame for permitting rotation in two mutually perpendicular planes which are perpendicular to the surface to be controlled, one of the planes being parallel to the blank axis. The guides are mounted on the carriage. The centers of the pickups are arranged at the same straight line which is parallel to the guides, and the distance between the centers is defined by the relationship presented in the invention description. EFFECT: improved accuracy and enhanced quick operation. 3 dwg

Description

 The invention relates to metallurgy and is intended for use in continuous casting of metals.

A device for monitoring surface defects of a hot billet during its casting on a continuous casting machine containing a cylindrical sensor whose axis is perpendicular to the surface to be monitored, a trolley and registration equipment [1]
A disadvantage of the known technical solution is the small width of the controlled area.

Of the known technical solutions, the closest to the invention is a device for monitoring surface defects of a hot billet during its casting on a continuous casting machine, comprising a frame, a cylindrical sensor whose axis is perpendicular to the surface, a scanning unit including guides parallel to the surface of the workpiece and perpendicular to its axis, installed on guides with the possibility of moving the carriage with a sensor mounted on it and a drive for moving the carriage and recording equipment [2]
A disadvantage of the known technical solutions are low accuracy and speed. The first drawback is associated with the absence in the known technical solution of a means ensuring a constant gap between the detector and the surface being monitored. The second drawback is the use of a single sensor and the need for more time to move it over the entire width of the workpiece.

 The purpose of the invention is improving accuracy and speed.

где А амплитуда сканирования;
L₃ ширина заготовки;
R_o радиус датчика;
δ 0-40 мм ширина неконтролируемого участка вблизи кромки заготовки, а координаты центров датчиков вдоль оси, параллельной направляющим, в исходном положении составляют Х₁ R_o + δ Х₂ L_3/2, где отсчет координат ведется от кромки заготовки.This is achieved by the fact that a device for monitoring surface defects of a hot billet during its casting on a continuous casting machine, comprising a frame, a cylindrical sensor whose axis is perpendicular to the surface being monitored, a scanning unit that includes guides parallel to the surface of the workpiece and perpendicular to its axis mounted on the guides with the possibility of moving the carriage with a sensor mounted on it and a drive for moving the carriage, and recording equipment, the scanning unit additionally with holds a trolley mounted with the possibility of wheels touching the surface of the workpiece, and the trolley is hinged to the frame and can be rotated in two mutually perpendicular planes normal to the controlled surface, of which one plane is parallel to the axis of the workpiece, the guides are mounted on the trolley, the sensor centers are located on one a straight line parallel to the guides, and at a distance L _o = A

where A is the scanning amplitude;
L _{3 the} width of the workpiece;
R _{o the} radius of the sensor;
δ 0-40 mm the width of the uncontrolled area near the edge of the workpiece, and the coordinates of the centers of the sensors along the axis parallel to the guides in the initial position are X ₁ R _o + δ X ₂ L _3/2 , where the coordinates are counted from the edge of the workpiece.

 In FIG. 1 shows a device plan; in FIG. 2 same front view; in FIG. 3 geometric parameters of the device.

The device comprises a frame 1, first 2 and second 3 sensors of cylindrical shape, the axes of which are perpendicular to the surface 4. The scanning unit 5 includes guides 6 parallel to the surface of the workpiece 7 and perpendicular to its axis, a carriage 8 mounted on rails with the possibility of movement, and a drive 9, the movement of the carriage, and recording equipment 10. The device also includes a trolley 11, mounted with the possibility of wheels 12 to touch the surface of the workpiece. The trolley with a hinge 13 is mounted on the frame with the possibility of rotation in two mutually perpendicular planes normal to the controlled surface, of which one plane is parallel to the axis of the workpiece. The guides are mounted on a trolley. The centers of the sensors are placed on one straight line parallel to the guides, and at a distance L _o , and the coordinates of the centers of the sensors along the axis parallel to the guides in the initial position are the indicated values.

 The device operates as follows.

Using the drive 9, the carriage 8 is installed in the extreme left position. The coordinates of the centers of the sensors take the above values. Then turn on the actuator 9 and the carriage 8 begins reciprocating motion. Its amplitude is chosen equal to A L _o , due to which the overlapping sections of the control of the first 2 and second 3 sensors are ensured. By selecting the scanning speed, overlapping adjacent scanning paths along the workpiece is achieved. Thus, the device provides complete control. In this case, defects are recorded using recording equipment.

 The device can be used to control the wide edges of the workpiece.

 The width of the uncontrolled section δ cannot be negative, since in this case the sensors will go beyond the edge of the workpiece, and a false defect from the edge will be recorded on the recording equipment 7. The value of δ cannot exceed 40 mm, since otherwise, for example, for slabs 1000 mm wide, more than 8% of the surface will be uncontrolled.

PRI me R. To control the slab with a width of 1000 and a thickness of 160 mm, sensors with a radius of R _o 50 mm were used; the value was taken to be 10 mm. The coordinates of the starting points of the centers of the sensors are X ₁ 60 mm, X ₂ 500 mm. After turning on the actuator 7, the sensors begin reciprocating motion with an amplitude of A 440 mm. In the far right of FIG. 3 position, the second sensor 3 is located at a distance of 10 mm from the right edge of the slab.

 The accuracy of setting the clearance h (see Fig. 2) between the sensors and the controlled surface is determined by the distance between the front and rear wheels equal to 0.5 mm. From here, for example, with a maximum slab non-span of 1 mm per 1000 mm, in the proposed solution, the deviation of the gap will be 0.5 mm. In the well-known solution, there are no means of ensuring the constancy of the gap. The sensor is at a constant level in height, so the inconsistency of the gap depends only on the location of the slab. The latter is based on rollers, the distance between which is 2 m, hence the deviation of the gap is 2 mm. For a sensor operating in linear mode, the accuracy is inversely proportional to the gap, therefore, in this device, the measurement accuracy is 4 times higher.

 The second advantage of the proposed solution is increased performance. The fact is that any sensor and recording equipment have limitations on scanning speed. This limitation is ultimately expressed by a parameter such as the maximum scanning speed. Hence, the measurement time is determined only by the path traveled. And since in the present device the distance traveled or the scanning amplitude is two times less, then the speed is two times higher.

Claims (1)

DEVICE FOR CONTROL OF SURFACE DEFECTS OF HOT PREPARATION DURING ITS CASTING ON A continuous casting machine, containing a frame, a defect measurement sensor made cylindrical, whose axis is perpendicular to the surface being scanned, including the guides parallel to the controlled surface of the workpiece and perpendicular to it carriage movement with a sensor mounted on it, a carriage movement drive and recording equipment connected to the sensor, characterized the fact that it further comprises a second defect measurement sensor connected to recording equipment, the axis of which is perpendicular to the surface being monitored, the scanning unit further comprises a trolley mounted to allow the wheels to touch the surface of the workpiece, the trolley being hinged to the frame and can be rotated in two mutually perpendicular to the planes normal to the controlled surface, of which one is parallel to the axis of the workpiece, the guides are mounted on the trolley, the centers sensors placed on one straight line parallel to the guides, and at a distance

where A is the scanning amplitude;
L _{s the} width of the workpiece;
R ₀ radius of the sensor;
δ 0 40 mm the width of the uncontrolled area near the edge of the workpiece,
and the coordinates of the centers of the sensors along the axis parallel to the guides in the initial position are
X ₁ = R _o + δ, X ₂ L _s / 2
with reference from the edge of the workpiece.

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