JPS61219403A - Method for removing flaw of stock to be continuously cold rolled - Google Patents

Abstract

PURPOSE:To improve the production efficiency of a steel strip by removing flaws from a steel strip by controlling actuating point of time, time and speed with the aid of a flaw removing device, in continuous sold rolling, based on the flaw information of the steel strip, stored after pickling. CONSTITUTION:Information collected in a continuous pickling line, is once stored in a flaw information collecting computer 32. The information is transmitted to a flaw removing device computer 51 of continuous cold rolling line 5. A flaw removing device 52 is installed at the inlet side of a rolling mill 53 on the continuous rolling line 5. The computer 51 transmits control signals to the device 52 based on these information, to control the actuating point of time, time and speed of the device 52. By removing the flaws of rolling stock in such manner, the quality of stock in the succeeding stage is secured, and the production efficiency is improved as a result.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a method for removing flaws in a continuous cold rolling base material in a continuous cold rolling line.

(b) Prior Art In recent years, in order to improve rolling efficiency, continuous rolling has been carried out, in which the ends of a rolled material are connected at the ends and rolled continuously. For example, as shown in FIG. 4, a hot-rolled steel strip rolled in a hot-rolling line 1 is wound into a hot-rolled coil 2, sent to a continuous pickling line 6, and the ends of the coil are connected with a wire. pickling, winding as a pickling coil 4, rolling it, sending it to a continuous cold rolling line 5, connecting the end of the coil again and connecting it continuously;
It was unrolled as 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 completing annealing and skin pass rolling, and any removable flaws have been polished off on a care line.

There are various types of flaws in cold-rolled base materials, and although mild flaws should be able to be removed within the production line, conventional methods have not removed such flaws. This is because the line is slowed down or stopped twice for inspection and maintenance in order to improve the line speed.

(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 the quality of the final product. The object of the present invention is to obtain a second flaw removal method that improves efficiency.

(D) Problems Means for the Invention The method for removing defects from a continuous cold rolled base material of the present invention is to remove defects on the front and back surfaces of each steel strip after pickling treatment on the outlet side of a continuous pickling line for hot rolled steel strips. detecting the position and size of the flaw; storing information on the detected flaw; providing a device 2 for removing flaws on the front and back surfaces of the steel strip at the entrance side of the rolling mill in the continuous cold rolling line; Based on the low information about the steel strip during rolling, what is the operating point, time and speed of the flaw removal device? The present invention overcomes the above problems by controlling the removal of defects from the steel strip.

(Embodiment) Fig. 2 shows the collection of low information on surface flaws of steel strip S in continuous pickling line 6. Hot-rolled coils 2 are connected at their ends and sent one after another to pickling tank 61, and After washing, wind the pickling coil 4 in sequence.

In this line, the low information of the steel strip S is stored in the low information collecting computer 62. In order to obtain this flaw information, various types of tracking information (for example, inlet melting information, line operation information, coil length information, tension/reel rotation speed information, etc.), inlet/outlet coil profile information, surface flaw information, etc. (The position and size of the flaw) are sequentially input into the computer 62.

From this information, the following data is formed in the low information database 66.

■ Coil common information (cold rolled) material coil) Coil A
, total coil length, flaw information f'l = number, board width, ■ low information (
(For each coil) Length from the coil tip (coil inner diameter side), degree of flaw (depth), duration, front and back classification This low information can be stored in any number of information areas for one coil. Have 2. This number is expressed as the number of low information items among the coil common information (■).

Here, the length position from the tip of the coil for the low electrical information may be set from the inner diameter side of the coil or from the outer diameter side.

That is, during continuous cold rolling, the flaw removal device control computer 51 measures the coil length starting from the outer side and performs control 2, so in any case, one of the computers converts the coil length to the length starting from the outer diameter side. data shall be used.

FIG. 1 shows a method for removing defects in the base material in a continuous cold rolling line 5 based on the aforementioned low information. show. The low information from the low information collecting computer 2 is sent to the flaw removal device control computer 51 of the continuous cold rolling line 5.

The flaw removing device 52 is provided on the inlet side of the rolling mill 56 in the continuous cold rolling line 5, preferably on the inlet side of an inlet loop car 54 provided on the inlet side of the rolling mill 560. The flaw removal device [52 uses an abrasive brush roll or the like.

In addition to low information from the low information collection computer 62 mentioned above, the flaw removal device control computer 51 receives low information.

Line tracking information (for example, entrance welding information, line operation information, steel strip running information, etc.), coil shop information, feed reel rotation information, etc. are input.

The computer 51 sends a control signal 2 to the flaw removing device 52 based on these 1 green report, and determines the operating point and time of the device 52.
Time/speed? Control. The activation timing of the flaw removing device 52 is controlled to match the flaw position on the steel strip S. The purpose of controlling the operating time is to match the length of the flaw. Is the operating speed controlled by the relative speed between the steel strip S and the device 52? This is to adjust 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 factor squared.

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

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

(F) Specific examples ■ Coil common information Coil A: 1.2, 3.4 Coil total length: 2468 m Number of flaw information 2 front 2 back 2 steel strip width: 1250 mm ■ Flaw information coil position depth Length Front and back classification (m)
(ax) (m) 11033 Front 2 10 3 100 Back 31500
2100 Table 4 24001 20 Back ゛■ Defect removal work as shown in Figure 6.

(g) Effects According to the method of the present invention, by removing defects in the rolled base material, quality can be ensured in subsequent processes, and it is possible to ensure quality in the subsequent process. Since defects can be removed without stopping or slowing down, manufacturing efficiency can be improved as a result7).

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the flaw removal method of the present invention. FIG. 2 is an explanatory diagram showing the collection of surface flaws on a grated steel strip in a continuous pickling line. FIG. 3 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. 61: Pickling tank, 52: Defect removal equipment section 1.56: Rolling machine,
54: Loop car. Patent Applicant: Sumitomo Metal Industries, Ltd. Procedural Amendment (July 1985 -) 3] 1. Name of the invention: Method for removing defects from continuous cold rolling base material; Relationship with the person making the amendment; Patent applicant: Address Name (211) Sumitomo Metal Industries Co., Ltd. 4, Agent 5, All drawings subject to amendment 6, Contents of amendment

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.