JPH1157960A - Method for deburring cast slab and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect the position of burr positioned on the lower surface at the front tip part or at the rear end part of a cast slab and to remove the burr by calculating the warping amount of the cast slab from the detected value on the lower surface of the cast slab in a fixed length part except the burr part from the front tip part or the rear end part of the cast slab and deciding the elevating amount of a rotor. SOLUTION: The front tip and the rear end parts of the cast slab 8 during carrying on table rollers 7 are detected with a cast slab tip and rear end part detecting sensor 6 and the carrying distance is calculated from the carrying speed of the cast slab. The front tip part or the rear end part of the cast slab 8 is press-touched with a mechanical type cast slab lower surface detection touching sensor 5' arranged at the front part by one roll pitch from a rotor shaft 2 to detect the lower surface of the cast slab at the position of 300 mm distance from the front tip part or the rear end part of the cast slab 8. At this time, the cast slab 8 must be corrected as the warping upward in the case this detected value is higher than the table roller 7 level, and as the warping downward reversely in the case this value is lower than this level. The rotor shaft 2 arranged at the rear of the carrying is risen to this corrected cast slab lower surface position and the burr 9 is hit with a hammer 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slab deburring device in a continuous casting facility or other slab refining equipment, and a system for detecting burrs on a slab under a slab.

[0002]

2. Description of the Related Art A gas cutting machine for cutting slabs is installed downstream of continuous casting. Molten metal at the time of cutting adheres to the lower surface of a slab cutting portion (this deposit is referred to as a burr). ), It is necessary to remove the burrs, because it will hinder the next step of rolling. The following is known as a conventional technique for removing the slab burrs. A hammer-type deburring device that rotates a hammer-incorporated rotor and strikes the hammer on the underside of the slab with the rotational force. (Japanese Patent Application Laid-Open No. 61-236412)

[0003] In the hammer-type deburring method, the optical path connecting the light-emitting device and the light-receiving device of the optical sensor is raised and lowered together with a rotor provided at an angle with respect to the bottom surface and cut surface of the cast piece. A method of detecting the lower surface and determining the rotor lifting stop position. (JP-A-4-270044
In the hammer-type deburring method, the degree of warpage of the end of the slab is detected by using a first sensor installed on the moving path of the slab and a lower surface detection sensor that moves up and down together with the rotor.
A method in which the rotor is raised at an ascending speed set assuming the maximum warpage of the slab, temporarily stopped when detecting the position of the slab lower surface for a time corresponding to the warpage amount of the slab, and then the rotor is raised again to the target value. (Japanese Unexamined Patent Publication No. 7-185756)

Next, a general conventional slab deburring apparatus and a burr detection flow will be described with reference to the drawings. FIG. 3 is a configuration diagram of a conventional slab deburring apparatus, and FIG. 4 is a flow chart of a conventional slab bottom surface detection. The slab 8 cut by the gas cutting machine is conveyed on a table roller 7 and first shields the slab front and rear end detection sensor 6 from light. After time T1 from this timing, the rotor 2 incorporating the hammer 1 starts rotating and ascending. The optical slab lower surface detection sensor 5 which has a light projecting and a light receiving portion in the axial direction of the rotor 2 and moves up and down together with the rotor 2 recognizes the point where the light is shielded on the lower surface of the slab 8 as the lower surface of the slab 8 and determines the rotor rising amount Y. Then, the ascent of the rotor 2 is stopped and the burr 9 located on the lower surface of the tip of the slab is hit and removed. Fixed time (T2)
Thereafter, the rotor 2 is lowered to the lower limit of the rotor, the rotation is stopped, and the removal of the burrs at the tip ends. Subsequently, to remove burrs at the rear end, the slab 8 is conveyed on the table roller 7 and after a time (T1) from the point where the slab 8 has passed through the slab front and rear end detection sensor 6,
The rotor 2 incorporating the hammer 1 starts rotating and ascending. Thereafter, the burrs at the rear end are removed in the same manner as when removing the burrs at the front end.

[0005]

However, these prior arts have the following problems. Since the rotor stop position is used as a mechanical stopper, if the slab shape changes, the hammer cannot be used to strike the slab accurately, so that burrs such as undulating or deep digging of the underside of the slab cannot be removed accurately. Since the rotor center position and the bottom surface detection sensor are located at a distance from each other, the slab being transported moves up and down due to warpage and roll pitch between the bottom surface detection position and the burr removal position, removing burrs. Since the lower surface detection value is obtained in a slab state different from the slab state, it is not possible to accurately remove burrs such as a swing of a hammer and deep digging of the underside of the slab. Further, since the lower surface detection sensor of the slab is an optical sensor, the slab is 800
In the case of a hot piece at a temperature of up to 900 ° C., accurate position detection cannot be performed due to fluctuations in the atmosphere, and burrs such as an empty swing and deep digging on the lower surface of the cast piece cannot be removed accurately.

A mechanism for raising and lowering the lower surface detection sensor together with the rotor. Since the rotor is raised at a high speed on the assumption of the maximum amount of warpage of the slab, the lower surface detection error of the sensor when the rotor is raised and the hydraulic pressure at the rising stop point The operation error becomes large, and it is not possible to accurately remove burrs such as idle swing and deep digging of the lower surface of the slab. Also, if the rotor lifting speed is reduced to reduce the above error, the slab can be transported only from the lower surface detection sensor position to the hammer position within the control time from the lower surface detection to the completion of the hammer lifting, so the transport speed must be kept low. And the cycle time is hindered. The present invention has been made in order to solve the problem of the detection of burrs on the lower surface of the slab in these conventional deburring devices, and accurately detects the burrs located at the lower surface of the leading end or the rear end of the slab to detect burrs. It is an object of the present invention to provide an apparatus for removing and a method for removing burrs.

[0007]

According to the present invention, in a hammer-type deburring method, a tip position of a slab being conveyed on a roller table is detected, a conveying distance is calculated from a slab conveying speed, and the distance is calculated from a rotor shaft. The amount of warpage of the slab is calculated from the detected value of the lower surface of the slab at a fixed length portion where the burr is removed from the leading or trailing end of the slab at the front of one table roll pitch, and the rotor rise amount is determined. Slab burrs removal method. And, the slab tip rear end detection sensor, a mechanical slab lower surface detection touch sensor, and a calculator for calculating the amount of warpage of the slab from the detection value of the mechanical slab lower surface detection touch sensor, and from the calculation result A slab deburring device, comprising: a control device for determining a rotor rise amount.

That is, in addition to the conventional hammer-type deburring device, the present invention provides a slab tip / rear end detection sensor for detecting a leading end position of a slab being conveyed on a roller table, and a conveying distance based on a slab conveying speed. A mechanical slab lower surface detection sensor that is calculated and installed one table roll pitch in front of the rotor shaft for detecting the lower surface of the slab at a portion of a length a from the leading end or the rear end of the slab. Is higher than the roller table level, it is assumed that the slab is warped, and if the detection value is lower than the roller table level, it is assumed that the slab is warped downward. And a control device having an arithmetic function capable of correction. According to the apparatus of the present invention, the rotor shaft is accurately raised, including the depth at which the slab does not impede the slab transport speed and hits the burr attachment position on the lower surface of the front or rear end of the slab regardless of the slab temperature. By being able to hit burr accurately with a hammer,
Deburring can be performed reliably.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a slab deburring apparatus to which the present invention is applied, and FIG. 2 is a flow chart of a slab lower surface burr detection system in consideration of warpage of a slab according to the present invention in the longitudinal direction. The slab deburring apparatus to which the present invention is applied is a rotor shaft 2 having six rows of 72 hammers 1 arranged on a circumference = 432 in total, a driving device 4 for rotating the shaft, and a designated position for vertically moving the shaft. 3, a mechanical slab lower surface detection sensor 5 'installed one table roll pitch in front of the rotor shaft 2 from the rotor shaft 2, a slab position during conveyance, a lower surface detection position, and a casting for detecting a rotor elevating position. It comprises a one-end / rear-end detection sensor 6 and a control device (not shown) for controlling these sensors.

FIG. 1 shows a slab deburring apparatus to which the present invention is applied.
As shown by, the leading end of the slab 8 being conveyed on the table roller 7 is detected by the slab leading and trailing end detection sensor 6, the conveying distance is calculated from the slab conveying speed, and the leading end or the rear end of the slab 8 is determined. By pressing the mechanical type slab lower surface detection touch sensor 5 ′ disposed one roll pitch in front from the rotor shaft 2, the lower surface of the slab is detected at a position 300 mm from the leading end or the rear end of the slab 8. If the detected value is higher than the table roller 7 level, the slab is corrected as being warped, and if the detected value is lower than the table roller 7 level, the slab is corrected as being warped, The rotor shaft 2 installed at the rear of the conveyance is moved up to the corrected lower position of the cast slab and the burr 9 is hit with the hammer 1.

FIG. 2 shows the logic in consideration of the correction of the detected value. Generally, since the longitudinal warpage of the slab has an arc shape, the amount of warpage correction in the longitudinal direction is determined by the following correction formula. Height H of the slab tip rear end from the table after correction H = ｛2 [h
+ Α (L)] L ² ｝ / ｛(L-2a) ² +4 [h + α
(L)] ² ｝ Here, H: height from the table pass line at the end of the slab tip h: detected height from the table pass line at the slab lower surface detection position L: slab length a: slab Length from front (rear) end to lower surface detection position α (L): correction value of slab lower surface position based on slab length

According to the present invention, the lower surface detection by the mechanical type slab lower surface detection touch sensor 5 'is set to the above-mentioned position, so that the same condition can be set between the lower surface detection position and the burr hitting position with respect to the movement of the slab due to warpage. Accordingly, the same lower surface detection as in the burr hit state can be performed, and deburring can be performed more accurately than in the past.
In addition, when the temperature of the slab 8 is 800 to 900 ° C., the atmosphere fluctuates due to thermal influences, so that an error occurs in the detection position of the conventional laser slab lower surface detection sensor 5. The lower surface detection touch sensor 5 'can reliably detect without being affected by the fluctuation of the atmosphere, so that deburring can be accurately performed. Further, in the present invention, the distance from the detection of the lower surface to the impact of the hammer can be as long as one roll pitch (1850 mm in the present embodiment), which is longer than that of the related art.

[0013]

According to the slab bottom surface burr detection system of the present invention, the following effects can be expected. Even if the slab is warped in the longitudinal direction, even if the slab is warped in the longitudinal direction, even if the slab is warped in the longitudinal direction, to accurately detect the positions of the slab tip and the rear end, the hammer does not swing and hits the slag accurately. In order to correctly detect the position of the slab tip and the rear end, the underside of the slab is deeply cut to give an unsuitable flaw on the slab as a product. By hitting, there is no possibility of giving a large reaction force to the device at the time of hitting and damaging the device, etc.
Deburring can be performed reliably. Since the sensor that detects the burr-adhering surface is a mechanical touch sensor, accurate position detection can be performed even when the cast piece is a hot piece at 800 to 900 ° C., and deburring can be performed reliably. Since the distance from the position of the burr-adhering surface to the hammer can be increased, the time required for detecting the lower surface of the slab and the completion of the ascent of the hammer can be kept long.Therefore, it is not necessary to suppress the slab transport speed to a low speed. Deburring can be performed without deteriorating the cycle time of single transfer.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a slab deburring apparatus to which the present invention is applied,

FIG. 2 is a flow chart of a slab lower surface burr detection system in which the warpage of the slab in the longitudinal direction according to the present invention is considered.

FIG. 3 is a configuration diagram of a conventional slab deburring apparatus;

FIG. 4 is a conventional slab bottom surface detection flowchart.

[Description of Signs] 1 Hammer 2 Rotor shaft 3 Elevating cylinder 4 Rotating drive device 5 Slab lower surface detection sensor 5 'Mechanical slab lower surface detection sensor 6 Slab tip rear end detection sensor 7 Table roller 8 Slab 9 Burr

Claims (2)

[Claims] In a hammer-type deburring method, a tip position of a slab being conveyed on a roller table is detected, a conveying distance is calculated from a slab conveying speed, and one distance is calculated from a rotor shaft.
The rotor is determined by calculating the amount of warpage of the slab from the detected value of the slab lower surface at a fixed length portion where the burr is removed from the front or rear end of the slab at the front of the table roll pitch. Slab burrs removal method. 2. A hammer-type deburring apparatus, wherein a slab tip and rear end detection sensor for detecting a leading end position of a slab being conveyed on a roller table, a conveying distance is calculated from a slab conveying speed, and a slab leading end is calculated. Alternatively, a mechanical slab lower surface detection touch sensor installed one table roll pitch in front of the rotor shaft for detecting the slab lower surface at a fixed length portion where a burr portion is removed from the rear end, and the mechanical slab lower surface detection touch A slab deburring device comprising: a calculator for calculating a warpage amount of a slab from a detection value of a sensor; and a control device for determining an amount of rise of a rotor from a calculation result.