JPS61266118A - Defect removing method for rolled material produced by continuous cold rolling - Google Patents

Abstract

PURPOSE:To improve production efficiency effectively by removing a defect having a defect removing device operate at an inlet side of a cold rolling line based on a defect record described on the both sides of a steel strip after a pickling process. CONSTITUTION:Hot rolled coils are successively fed to a pickling tank and the defect information on a steel strip S is stored by a computer 32. The information from the defect information computer 32 is fed a computer 51 for the control of the defect removing device in a continuous cold rolling line 5. The defect removing device 52 works under being controlled by the work timing, time and speed, and removes defects at the feeding side of a roller 53 by means of a brush roll containing grinding particles. As it is required to remove separately defects on the surface and reverse sides of the steel strip S, the defect removing device 52 is controlled separately for the surface and reverse sides. Thus the quality of the products is secured in the succeeding stage, and the defect removal is performed without reducing the speed of the continuous line and the production efficiency is improved.

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention is applicable to defects in continuous cold-rolled base material. , relates to a method for removal in a continuous cold rolling line.

(b) Conventional technology In recent years, rolling efficiency? In order to improve this, continuous rolling is performed in which the ends of the rolled material are Y-connected and rolled continuously. For example, as shown in FIG. 4, a hot rolled steel strip rolled in a hot rolling line i is wound into a hot rolled coil 2 and sent to a continuous pickling line 6.

Connect the end of the coil and pickle it continuously, #1 Washed coil 4
After unwinding, the coil is sent to a continuous cold rolling line 5, and the ends of the coil are connected again for continuous connection.

It was rolled as a cold rolled coil 6.

However, the flaws generated on the surface of the steel strip in the hot rolling line 1 or the continuous pickling line 6 are brought to the continuous cold rolling line 5 without being removed and are rolled as they are. Conventionally, steel strips have been inspected on an inspection line after completion of annealing and temper rolling, and then polished off on a removable flaw cleaning line.

There are various types of flaws in cold-rolled base materials, but mild flaws should be able to be removed within the production line, but is it possible to remove them using conventional methods? I wasn't there. Is this an improvement in line speed? Is the line slowing down or stopping due to inspection maintenance? This is to avoid it.

(c) Problems to be solved by the invention The problems to be solved by the invention are to remove surface defects of the continuous cold rolling base material before cold rolling, improve the quality of the final product, and improve manufacturing efficiency. How to remove scratches to improve performance? It's about getting.

) Means to solve the problem A method for removing flaws from a continuously cold rolled base material according to the present invention.

Detecting the position and size of flaws on the front and back surfaces of each steel strip after pickling treatment on the output side of a continuous pickling line for hot rolled steel strips, and storing the detected flaw information 1 in a continuous cold rolling line. A device for removing flaws on the front and back surfaces of the steel strip is provided at the entrance side of the rolling mill, and when the steel strip is rolled in the rolling mill, the operation time, time, and time of the flaw removal device are determined based on the flaw information about the steel strip.
By removing flaws from the steel strip at a controlled speed,
The above problems have been resolved.

(E) Embodiment FIG. 2 shows the collection of information on surface flaws of the steel strip S in the continuous pickling line 6. The hot-rolled coils 2 are connected at their ends and sent one after another to a pickling tank 61, and after pickling are sequentially wound as pickling coils 4.

In this line 6, flaw information on the steel WiS is stored in the flaw information collection computer 62. This flaw information? In order to obtain
Each package tracking information (e.g., input 1ltIl bath contact information, line operation information, coil length information.

Tension/reel rotation speed information, etc.), inlet/outlet coil black information, and surface flaw information (position and size of flaws) are sequentially input to the computer 32.

From this information, the following primary data is formed in the flaw information data page 66.

■ Coil common information (cold rolled base material coil) Coil shop,
Coil total length, number of flaw information, board width.

■ Flaw information (for each coil) Length from the coil tip and coil inner diameter 1111? ! 'The tip of the coil), degree of flaw (R), duration length, 1 front and back division This flaw information has an arbitrary number of information areas for one coil. This number is expressed as the number of flaw information among the coil common information (■).

Here, the length position from the coil light leakage of the information for each flaw may be the starting point of the coil inner diameter *V or the outer diameter imt' starting point. That is, during continuous cold rolling, the flaw removal i & negative control computer 51 performs control by measuring the coil length t as an outside starting point; The data must be converted into

FIG. 1 shows a method for removing flaws in the base material in the continuous cold rolling line 5 based on the above flaw information. The flaw information from the flaw information collection computer 62 is sent to the flaw removal device control computer 51 of the continuous cold rolling line 5 .

Remove scratches! 1flI 52 is provided on the inlet side of an inlet loop Q car 54 provided in the continuous cold rolling line 5 on the inlet side of the rolling mill 560, preferably on the inlet side of the rolling mill 56. The flaw removing device 52 uses a brush, roll, etc. that contains abrasive grains.

The flaw removal device control computer 51 receives flaw information from the flaw information collection computer 62 described above.

Line tracking information (e.g., input1Illlf#
contact information, line operation information, steel strip running information, etc.), coil boiling information, feed/reel rotation information, etc. are input.

Based on this information, the computer 51 operates the flaw removing device i! [A control signal is sent to 52 to control the operating point Φ time and speed of the device 1t52. The activation timing of the flaw removing device 52 is controlled to match the needle position of the steel strip S.

The purpose of controlling the operating time is to match the length of the flaw. The purpose of controlling the operating speed is to adjust the relative speed between the steel strip S and the device 52 to cope with the depth of the flaw. Instead of controlling the relative speed, the pressing of the device 52 may be controlled by multiplying the force plate width by a multiplier.

Since it is necessary to separately remove flaws on the front and back surfaces of the steel strip S, the flaw removing device 52 is controlled separately for the front and back surfaces.

It is preferable that flaw removal is performed uniformly across the entire width of the steel strip. This is because if localized flaws are removed, the flatness of the steel strip after pressing will deteriorate.

(To) Specific example 0) Coil common information Coil number: 1.2, 3.4 Coil total length: 2468 m Defect information note number 2 front 2 back 2 steel strip width: 1250 m ■ Defect 'ura report coil black place Placement Depth Length Front and back classification (m)
(□) (m) 11033 Front 2 10 3 100 Back 51500
2100 Table 4 2400 1 20 Back ■ Defect removal work as shown in Figure 6.

(g) Effects According to the method of the present invention, are there any defects in the rolled base material? By removing the defects, it is possible to ensure quality in subsequent processes, and the defects can be removed without stopping or slowing down the continuous line, resulting in improved manufacturing efficiency.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram without showing the flaw removal method of the present invention. FIG. 2 is an explanatory diagram showing surface flaw collection on a steel strip in a continuous pickling line. FIG. 6 is a graph showing the flaw removal operation according to the method of the present invention. FIG. 4 is an explanatory diagram showing method 2 for manufacturing a cold rolled steel strip. 51: Washing tank, 52: Scratch removal device, 56: Rolling machine,
54: Loop car.

Claims (1)

[Claims] Detecting the position and size of flaws on the front and back surfaces of each steel strip after pickling treatment on the exit side of a continuous pickling line for hot rolled steel strips, and storing the detected flaw information, in a continuous cold rolling line. A device for removing flaws on the front and back surfaces of the steel strip is provided on the inlet side of the rolling mill, and when the steel strip is rolled in the rolling mill, the timing, time, and speed of operation of the flaw removing device are determined based on the flaw information about the steel strip. A method for removing flaws from a continuous cold-rolled base material, the method comprising controlling and removing flaws from the steel strip.