RU2043847C1 - Device for controlling the surface defects of the hot casing in the process of its pouring in the continuous casting machine - Google Patents

Abstract

FIELD: metallurgy. SUBSTANCE: device has frame 1, transducer 2 for measuring the surface defects, unit 4 for scanning, carriage 7 with a pickup fastened on it, drive 8 for the carriage displacement and recording equipment 9. To enhance the accuracy, unit 4 for scanning additionally has truck 10 mounted so that wheels 11 can touch the casting surface. EFFECT: enhanced accuracy during the metal continuous casting. 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 recording equipment [1]
The disadvantage of this solution is the small width of the controlled area.

Closest to the invention is a device for monitoring surface defects of a hot billet during its casting in a continuous casting machine, comprising a frame, a cylindrical sensor whose axis is perpendicular to the surface being monitored, a scanning unit including guides parallel to the surface of the workpiece and perpendicular to its axis, mounted on guides with the ability to move the carriage with a sensor mounted on it, a carriage drive and recording equipment [2]
A disadvantage of the known solution is the low accuracy associated with the lack of a means of ensuring a constant gap between the detector and the controlled surface.

 The purpose of the invention is improving accuracy.

This goal is achieved in that the device for monitoring surface defects of a hot billet during its casting on a continuous casting machine contains a frame, a cylindrical sensor whose axis is perpendicular to the surface being monitored, a scanning unit including guides parallel to the controlled surface of the billet, and perpendicular to its axis, mounted on guides with the possibility of moving the carriage with a sensor mounted on it, a carriage moving drive and recording equipment. The scanning unit further comprises a trolley mounted with the possibility of wheels touching the surface of the workpiece. The scanning amplitude A L _z 2R _o 2δ, where L _{z 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 coordinate of the center of the sensor along an axis parallel to the guide in the initial position is X _o = R _o + δ, where the coordinate is counted from the edge of the workpiece.

 In FIG. 1 shows a device, a top view; figure 2 section aa in figure 1; figure 3 geometric parameters of the device.

 The device comprises a frame 1, a sensor 2 of a cylindrical shape, the axis of which is perpendicular to the controlled surface 3. The scanning unit 4 includes guides 5 parallel to the controlled surface of the workpiece 6 and perpendicular to its axis, a carriage 7 mounted on the guides with the possibility of movement, drive 8 and recording equipment 9 The device also includes a trolley 10 mounted with the possibility of wheels 11 to touch the surface of the workpiece. The trolley with a hinge 12 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 device operates as follows.

Using the drive 8, the carriage 7 is installed in the extreme left position. In this case, the coordinate of the center of the sensor takes the above value. Then drive 8 is turned on, and carriage 7 starts reciprocating with an amplitude equal to A L _o . By selecting the scanning speed, overlapping adjacent scanning paths along the workpieces is achieved. Thus, the device provides continuous control. In this case, defects are recorded using recording equipment.

 The device can be used to control any face of the workpiece.

 The width of the uncontrolled section o cannot be negative, since in this case the sensor 2 will go beyond the edge of the workpiece, and a false defect from the edge will be recorded on the recording equipment 9. The value of δ cannot exceed 40 mm, because otherwise, for example, for slabs 1000 mm wide, more than 8% of the surface will be uncontrolled.

 The following is an example of a specific implementation.

To control the slab with a width of 1000 mm and a thickness of 160 mm, a sensor with a radius of R _o 50 mm was used. The value of δ is taken equal to 10 mm. The coordinate of the starting point of the center of the sensor X _about 60 mm. After turning on the actuator 7, the sensor 1 starts a reciprocating movement with an amplitude A of 880 mm. 880 mm. In the extreme right position (Fig. 3), the sensor 2 is located at a distance of 10 mm from the right edge of the slab.

 The accuracy of setting the gap h (Fig. 2) between the sensors and the surface to be monitored is determined by the distance between the front and rear wheels equal to 0.5 m. From here, for example, with a maximum slab nonplanarity of 1 mm per 1 m, in the proposed solution, the gap deviation 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. Therefore, 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 linear sensor, accuracy is inversely proportional to the gap. Therefore, in the proposed device, the measurement accuracy is 4 times higher.

Claims (1)

DEVICE FOR CONTROL OF SURFACE DEFECTS OF HOT PREPARATIONS DURING ITS CASTING ON A continuous casting machine, containing a frame, a sensor for measuring defects of a cylindrical shape, the axis of which is perpendicular to the surface to be monitored, a scanning unit including guides parallel to the controlled surface of the workpiece and perpendicular to its axis with the possibility of movement a carriage with a sensor mounted on it, a carriage displacement drive and recording equipment connected to the sensor, characterized in that a scanning assembly further comprises a carriage mounted for the wheels touch the workpiece surface, the scanning amplitude
A = L ₃ - 2R _o -2δ,
where L _{s the} width of the workpiece,
R _{about the} radius of the sensor,
δ = 0 ÷ 40 mm the width of the uncontrolled area near the edge of the workpiece,
and the coordinate of the center of the sensor along the axis parallel to the guide in the initial position is x _o = R _o + δ, with reference to the coordinate from the edge of the workpiece.

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