JPS5870923A - Straightening method for continuously manufactured material - Google Patents

Abstract

PURPOSE:To automate straightening of bending of continuously manufactured materials and to improve the quality in a manufacture line of shape steel, etc. provided with a cutting machine in the rear of a straightening machine by correcting the position of rolls according to the result of detection of bending at the cut tip. CONSTITUTION:A hoop steel plate 1 is formed to a shape steel material 3 by a forming machine 2, sent to a straightening machine 5 through pinch rolls 4, and cut to a specified length by a cutting machine 6. Bending of the tip of cut shape steel 3 is detected by a detector 10 and a bending measuring device 11 provided at steplike part of a carrying table 8. The position of rolls 51 of the straightening machine 5 is corrected according to the detected value. Thus, straightening of bending of continuously manufactured materials is automated and the quality is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The method of the present invention relates to a method for straightening bends in a continuous manufacturing line for steel sections.

Continuously manufactured steel products manufactured by roll forming or welding of steel strips are formed and then passed through a straightening machine that corrects the bending caused by the forming before reaching a cutting machine. In particular, when forming with welding, bending occurs due to localized heating, and it is necessary to correct the bend using a straightening machine. However, the molded material is continuous before and after the straightening machine,
Further, since the molded material is held by side guides, no bending appears in the molded material, and the direction of correction, effect, etc. cannot be determined. For this reason, conventionally, the bending of the finished product was visually inspected at a position on the exit side of the cutting machine where there is no side guide, and the roll position of the straightening machine was manually adjusted.

For products made from steel strips such as shaped steel, most of the bending is due to internal stress in the steel strips, so the roll position of the straightening machine must be adjusted every time the lot of steel strips changes. There is a need.

As a conventional method for measuring bending of shaped steel materials, etc., there is
As proposed by 1t2tj, etc., the amount of bending is measured by cutting a shaped steel material to a standard size and then moving it in the width direction and detecting the contact angle with the product using a number of detectors arranged in a straight line. There is.

However, detecting bends using this method requires feeding the shaped steel material in the width direction, and for the production of shaped steel sections that are continuously formed and transported in the length direction, measurement is the next step, and a straightening machine is required. When the distance between the bend measurement position becomes large and the roll position of the straightening machine is adjusted after detecting the bend, the bending of the steel sections between the straightening machine and the bend measurement position will not be corrected, resulting in a large amount of bent steel sections. It has the disadvantage that it produces

The method of the present invention overcomes the aforementioned drawbacks and detects and corrects bends within the molding line.

The method of the present invention detects the cutting tip of the manufactured material at the exit side of the cutting machine installed at the rear of the straightening machine, measures the bending of the cutting tip in accordance with the detected cutting tip, and measures the bending of the cutting tip in accordance with the detected cutting tip. Based on this, the roll position of the straightening machine is adjusted. In addition, as a method for detecting the cutting tip, if there is a gap between the preceding section steel material and the following section steel material, a detector such as a phototube type may be used. When being transported, a step is provided on the transport table, and the tip of the following steel section is detected because the rear end of the preceding section steel material and the tip of the following section steel material are discontinuous in height due to the step.

When measuring the bending of a shaped steel material that is conveyed in the longitudinal direction, the direction of deviation from the center of the conveyance line is opposite between the longitudinal ends and the intermediate portion of the shaped steel material due to the relationship between the front and rear guides. For this reason, it is necessary to always perform bending measurement at a fixed position of the shaped steel material, and from this relationship, bending measurement is performed when the tip of the shaped steel material reaches a predetermined position. In order to improve measurement accuracy, it is better to measure near the tip of the long free section of the steel section.

Next, adjust the roll position of the straightening machine based on the five bend measurements. If the amount of bend can be measured accurately, it is sufficient to move the position of the straightening roll in proportion to the amount of bend, or the amount of bend can be accurately measured. In the case of a simple device where this is not possible, a Nutep system can be used that moves and corrects the position of the straightening roll by a certain amount when the amount of bending exceeds a certain value, which is particularly effective in continuous molding lines where conveyance is carried out at high speed. It is a method.

An embodiment of the method of the present invention will be described in detail below with reference to FIGS. 1 and 2.

Figure 1 shows the overall layout of the forming line for steel sections, where the material strip steel plate (C) is formed into a section steel (3) by a welding forming machine (2). The product is sent to a straightening machine (s) via (ri), and after straightening, it is cut into a predetermined length by a cutting machine (b), and then transported to a finishing line (not shown) by a transfer (7).

In addition, in the case of this continuous forming line, the feeding of the shaped steel material (3) is performed by pinch rolls, and all of the conveyor tables shown in Figure 1 are not driven, so that the shaped steel material (3) is not driven. (
3) is transported in a piled state even after cutting.

Figure 2 shows the method of the present invention, in which the height of a part of the conveyor table (table) on the exit side of the cutting machine (≦) is lowered, and the presence or absence of a shaped steel material is detected in the lowered part. A detector (10) is provided. The detector (10) detects that the steel section (3) is
/), and uses a contact-type limit switch or a non-contact proximity switch that uses magnetism, light, sound waves, etc. On the other hand, the curve measuring device (//
) (// ) is a section steel (3) in front of the detector (/).
) are installed in pairs on the left and right in the width direction. The measuring device (//)
(//) also needs to be detected only when the shaped steel material (3) is bent to a certain value or more, and a contact type limit switch or a non-contact type proximity switch, etc. should be installed at a predetermined distance from the shaped steel material (3). establish.

Next, to explain the order of operation, when the shaped steel material (3) cut by the cutting machine (6) is conveyed to the stepped part of the conveying table (g), the rear end of the preceding shaped steel material (3A) falls into the stepped part. The detector (/ is turned ON. When the steel section (3) is further fed, the tip of the succeeding section steel (3B) crosses the step, but the center of gravity is still at the rear (in front of the step), so it is not connected to the step. will be sent without falling.

The detector (/) is turned OFF when the preceding steel section (3A) is sent and becomes the following section steel (, ?B), and the section (3) is turned off.
Detect the tip of the The arithmetic unit (/2) is the detector (/'s 0
Upon receiving the tip detection signal from FFk, the following section steel material (
The bending of the tip of □□□ is received by the signal υ from the measuring device (//) (//), and the position of the roll (j/) of the straightening machine (S) is corrected by a certain amount according to the direction of the bend. issue a command.

In addition, if the distance between the bending measuring device (//) (//) and the straightening machine (jl) is longer than the standard cutting length of the section steel material (3),
Constant after the roll (!/) position is corrected, length section steel (3)
Prevents over-correction by stopping quantitative measurements being sent.

The tip of the following steel section (, ?B) can be detected in the same manner as described above by setting the level difference in the conveyance table (Z) higher than one roll (, ?B) as shown in Figure 3. . In addition, the cutting length of the shaped steel material (3) may be shortened in order to remove defective parts such as the joints between the steel strips.
Since the short section steel material is not subject to bending measurement, the section steel material (3
) If the distance between the position of the tip detector (10) and the stepped portion is greater than the length of the short steel material not to be measured, the problem will occur.

Next, an embodiment using the apparatus shown in FIGS. 1 and 2 will be described.

(Example) A product of lightweight H-beam steel 200×10OH length//111 was corrected for bending using the method of the present invention, and compared with a conventional manually adjusted product. The results are shown in Table 1, and the conditions for the method of the present invention are that the bending measuring device is set to turn on when the H-beam steel unibe deviates from the center of conveyance by more than the outer fin, and the straightening machine roll (4t/ ) was set to move 01111M at a time.

As mentioned above, the method of the present invention showed remarkable effects through simple equipment modifications, hardly required any operators, and caused almost no troubles such as malfunctions.

By the method of the present invention, bending of continuously manufactured materials can be automatically corrected within the molding line, which greatly improves product quality, saves labor, and is easy to maintain with a simple device. The effect is huge.

[Brief explanation of drawings]

Fig. 1 is an overall layout diagram showing an example of a forming line for continuously manufactured materials, Fig. 1 is a side view showing an embodiment of the method of the present invention, and Fig. 3 is a side view showing an example of detecting the tip of a shaped steel material. . /...Material steel strip 2...Welding forming machine 3...Shape steel material...
Pinch roll S... straightening machine 6.
Cutting machine 7 Transfer table 10 Detection hardness / Curvature measuring device / 2・・・・・・
Computer patent applicant: Sumitomo Metal Industries, Ltd. Patent attorney, Teru Tadashi Hogami Figure 1 Figure 2 [f

Claims (1)

[Claims] (C) In a continuous production line equipped with a cutting machine behind the straightening machine, the cut tip of the manufactured material is detected on the exit side of the cutting machine, and when the cut tip is detected, the bending of the tip of the manufactured material is measured, and the The method for straightening continuously manufactured materials according to claim 1, wherein the correction of the roller position of the straightening machine based on the measurement is performed by detecting the difference in height between the previously manufactured materials and the subsequently manufactured materials.