JP3410001B2 - Method and apparatus for removing slab burrs - Google Patents

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 facilities and a slab bottom surface burr detection system in the slab deburring device.

[0002]

2. Description of the Related Art A gas cutting machine is installed downstream of continuous casting for cutting slabs, but molten metal at the time of cutting adheres to the lower surface of the slab cutting portion (these deposits are referred to as burrs). ), It is necessary to remove the burrs because they hinder the rolling in the next step. The following are known conventional techniques for removing the slab burr. A hammer-type deburring device that rotates a rotor with a built-in hammer and uses the rotational force to hit the hammer against the bottom surface of the slab. (JP-A-61-236412)

In the hammer-type deburring method, a steel piece is used by using an optical sensor that moves up and down along with a rotor provided so as to incline the optical path connecting the light-emitting device and the light-receiving device of the optical sensor with respect to the bottom surface and the cutting surface of the slab. A method of detecting the lower surface and determining the rotor rising stop position. (JP-A-4-270044
In the hammer type deburring method, the degree of warpage of the end of the cast piece is detected using the first sensor installed in the moving path of the cast piece and the lower surface detection sensor that moves up and down together with the rotor,
A method in which the rotor is raised at a rising speed that is set assuming the maximum warpage of the slab, the rotor is temporarily stopped when the bottom surface position of the slab is detected for a time period corresponding to the amount of warpage of the slab, and the rotor is again raised to the target value. (JP-A-7-185756)

Next, a general conventional slab deburring apparatus and a deburring flow will be described with reference to the drawings. FIG. 3 is a configuration diagram of a conventional cast slab deburring device, and FIG. 4 is a flow chart of a conventional cast slab lower surface detection process. The slab 8 cut by the gas cutting machine is conveyed on the table roller 7, and first, the slab front and rear end detection sensor 6 is shielded from light. After a time T1 from this timing, the rotor 2 incorporating the hammer 1 starts to rotate and rise. The optical slab lower surface detection sensor 5 which has a light projecting and receiving section in the axial direction of the rotor 2 and moves up and down together with the rotor 2 recognizes a point shaded by the lower surface of the slab 8 as the lower surface of the slab 8 and sets it as the rotor rising amount Y. Then, the rise of the rotor 2 is stopped, and the burr 9 located on the lower surface of the tip of the slab is struck and removed. Fixed time (T2)
After that, the rotor 2 is lowered to the lower limit of the rotor, the turning is stopped, and the removal of burrs at the tip ends. Subsequently, the burrs at the rear end are removed by conveying the slab 8 on the table roller 7 and, after a time (T1) from the point at which the slab tip rear end detection sensor 6 passes light,
The rotor 2 incorporating the hammer 1 starts to rotate and rise. After that, the burr on the rear end is removed similarly to the case of removing the burr on the front end.

[0005]

However, these conventional techniques have the following problems. Since the rotor's ascending stop position is a mechanical stopper, if the shape of the slab changes, it cannot be accurately hit with a hammer, and thus burrs such as miss shots or deep digging of the bottom surface of the slab cannot be accurately removed. Since the center position of the rotor and the bottom surface detection sensor are installed apart from each other, the slab being conveyed moves up and down due to the warp and roll pitch between the bottom surface detection position and the burr removal position, and the burr is removed. Since it is the lower surface detection value in a slab state different from the state, it is not possible to accurately remove burrs such as a missed hammer and deep digging of the bottom surface of the slab. Moreover, since the lower surface detection sensor of the slab is an optical sensor,
In the case of a hot piece of ˜900 ° C., accurate position detection cannot be performed due to fluctuations in the atmosphere, and burrs such as blanking or deep digging of the bottom surface of the slab cannot be accurately removed.

A mechanism for raising and lowering the lower surface detection sensor together with the rotor raises the rotor at a high speed on the premise of the maximum warp amount of the slab. Therefore, the lower surface detection error of the sensor when the rotor rises and the hydraulic pressure at the rising stop point The operating error of is large, and burrs such as idling and deep digging of the bottom surface of the slab cannot be accurately removed. Further, if the rotor rising speed is reduced to reduce the above error, the slab can only be conveyed 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 rising, so the conveying speed must be kept low. It will obstruct the cycle time. The present invention was made in order to solve the problems of the slab bottom surface burr detection in these conventional deburring devices, and accurately detects the burr position located on the bottom surface of the slab tip or rear end to remove burrs. It is an object of the present invention to provide a removing device and a burr removing method.

[0007]

According to the present invention, in a hammer type deburring method, the tip position of a slab being conveyed on a roller table is detected, the conveying time is calculated from the slab conveying speed , The rotor is calculated by calculating the amount of warpage of the slab from the detected value on the bottom surface of the slab at a fixed length part with the burrs removed from the front or rear end of the slab at the front by one table roll pitch from the rotor axis, which is the center of rotation. A method for removing slab burrs, characterized by determining the amount of rise. And, the above-mentioned slab front end detection sensor, a mechanical type slab lower surface detection touch sensor, a calculator for calculating the amount of warp of the slab from the detection value of this mechanical type slab lower surface detection touch sensor, and from the calculation result A slab deburring device, comprising: a controller for determining the amount of rise of the rotor.

That is, in addition to the conventional hammer type deburring device configuration, the present invention provides a slab front and rear end detection sensor for detecting the front end position of a slab being conveyed on a roller table, and a conveying time from a slab conveying speed. A mechanical type slab bottom surface detection sensor that is installed in front of the rotor shaft for one table roll pitch to calculate and detect the bottom surface of the slab at the length a from the front or rear end of the slab, and the detection value at this time. Is higher than the roller table level, the slab is warped upward, and if the detected value is lower than the roller table level, the slab is warped downward. And a control device having an arithmetic function capable of correction. According to the device of the present invention, it does not hinder the conveying speed of the slab, and regardless of the slab temperature, the rotor shaft is accurately raised to the burr adhesion position on the lower surface of the front end or the rear end of the slab including the depth. By being able to hit the burr accurately with a hammer,
Deburring can be done reliably.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a slab deburring apparatus to which the present invention is applied, and FIG. 2 is a slab bottom surface burr detection system flow diagram in which a longitudinal warpage of the slab according to the present invention is taken into consideration. The slab deburring device to which the present invention is applied includes a rotor shaft 2 in which six rows of hammers 1 × 72 pieces = total 432 pieces are arranged on the circumference, a drive device 4 for turning the shaft, and a designated position for moving the shaft up and down. Cylinder 3 which has a stop function in the above, mechanical type slab lower surface detection sensor 5'installed in front of rotor shaft 2 by one table roll pitch, casting for detecting slab position during conveyance, lower surface detection position and rotor up / down position It is composed of the one-end / end-end detection sensor 6 and a control device (not shown) for controlling these.

A slab deburring apparatus to which the present invention is applied is shown in FIG.
As shown in, the front end of the slab 8 being conveyed on the table roller 7 is detected by the slab front end detection sensor 6, the conveying time is calculated from the slab conveying speed, and the front or rear end of the slab 8 is detected. A mechanical type slab bottom surface detection touch sensor 5'disposed on the front side of the rotor shaft 2 by one roll pitch is pressed to detect the bottom surface of the slab at a position 300 mm from the front end or the rear end of the slab 8. At this time, If the detected value is higher than the table roller 7 level, it is corrected as if the slab is warped, and if the detected value is lower than the table roller 7 level, it is corrected as if the slab is warped. The rotor shaft 2 installed at the rear of the conveyance is moved up to the corrected bottom surface position of the slab, and the burr 9 is struck with the hammer 1.

A logic considering the correction of the detected value is shown in FIG. 2. Generally, since the longitudinal warp of the slab has an arc shape, the warp correction amount in the longitudinal direction is determined by the following correction formula. Height of corrected slab tip from the table H = {2 [h
+ Α (L)] L ² } / {(L-2a) ² +4 [h + α
(L)] ² } where, H: height from the table pass line at the leading and trailing ends of the slab h: height detection value from the table pass line at the slab lower surface detection position L: slab length a: slab Length from front (rear) end to bottom surface detection position α (L): Correction value of bottom surface position of slab based on slab length

According to the present invention, by setting the lower surface detection by the mechanical slab lower surface detection touch sensor 5'to the above-mentioned position, it is possible to make the lower surface detection position and the burr striking position the same condition regarding the movement of the slab due to warpage. Therefore, it is possible to detect the lower surface in the same manner as in the burr hitting state, and deburring can be performed more accurately than before.
Further, since the atmosphere fluctuates under the high temperature condition of the cast slab 8 of 800 to 900 ° C. due to the heat effect, the conventional laser cast slab lower surface detection sensor 5 causes an error in the detection position. The lower surface detection touch sensor 5 ′ can reliably detect deburring without being affected by the fluctuation of the atmosphere, and thus can accurately remove burrs. Further, in the present invention, the distance from the detection of the lower surface to the hammer hitting is one roll pitch (1850 mm in the present embodiment), which is a longer transport distance than the conventional one, so that the transport speed is faster than the conventional one.

[0013]

According to the slab lower surface burr detection system of the present invention, the following effects can be expected. Even if the slab warps upward in the longitudinal direction, the position of the front and rear ends of the slab is detected correctly, so the hammer does not swing and hits the slot accurately, even if the slab warps downward in the longitudinal direction. In order to correctly detect the position of the front and rear ends of the slab, the bottom surface of the slab is deeply scooped and the slab may be unsuitable as a product. There is no possibility of damaging the device by giving a large reaction force to the device by hitting.
Deburring can be done reliably. Since the sensor for detecting the burr-attached surface is a mechanical touch sensor, accurate position detection can be performed even when the cast piece is a hot piece of 800 to 900 ° C, and reliable deburring can be performed. Since the distance from the position where the burr adhered surface is detected to the hammer can be made longer, it is possible to secure a longer constraint time until completion of hammer rise than detection of the bottom surface of the slab, so there is no need to keep the slab conveyance speed low. Deburring can be performed reliably without impeding the cycle time of single-sided conveyance.

[Brief description of drawings]

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

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

FIG. 3 is a configuration diagram of a conventional slab deburring device,

FIG. 4 is a conventional flow chart for detecting a bottom surface of a cast slab.

[Explanation of symbols]

1 hammer 2 rotor shaft 3 Lifting cylinder 4 Turning drive 5 Slab bottom surface detection sensor 5'mechanical slab bottom surface detection sensor 6 Slab front and rear edge detection sensor 7 table roller 8 slab 9 Bali

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-320263 (JP, A) JP-A-6-312261 (JP, A) JP-A-4-270046 (JP, A) JP-A-7- 185756 (JP, A) Actual opening 2-43608 (JP, U) Actual opening Sho 63-150762 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B22D 11/126 B22D 11 / 16 B23K 7/00 B23K 7/10

Claims (2)

(57) [Claims] 1. In a hammer-type deburring method, a tip position of a slab being conveyed on a roller table is detected, a conveying time is calculated from a slab conveying speed, and the rotation of the hammer is calculated.
The rotor is calculated by calculating the amount of warp of the slab from the detected value on the bottom surface of the slab at a fixed length part with the burrs removed from the front or rear end of the slab by 1 table roll pitch from the rotor axis which is the center of rotation. A method for removing slab burrs, characterized by determining the amount of rise. 2. A hammer-type deburring device, a slab front / rear end detection sensor for detecting a front end position of a slab being conveyed on a roller table, and a conveying time calculated from a slab conveying speed to obtain a slab tip. Alternatively, the bottom surface of the slab is detected at the fixed length part where the burr is removed from the rear end , and the hammer
A mechanical slab lower surface detection touch sensor installed in front of the rotor shaft, which is the center of rotation, by one table roll pitch, and a calculator that calculates the amount of warp of the slab from the detection value of this mechanical slab lower surface detection touch sensor. And a control device that determines a rotor rise amount from a calculation result.