JPS6031566B2 - Control method of automatic shape steel straightening machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling an automatic shape steel straightening machine that straightens the straightness of a shape steel, a deformed pipe, etc.

The applicant first proposed a detection device that measures the thickness or outer diameter of the straightened portion when a portion of the tip of the material to be straightened is straightened, a detection device that measures the vertical distance between the upper and lower straightening rolls, and a detection device that measures the vertical distance between the upper and lower straightening rolls; A detection device that detects the upper surface or lower surface position (height) of the material to be straightened at a preset position from the lower roll or the exit upper roll, and the detection value detected by each of the detection devices and the flea of each straightening roll. Automatic shape steel straightening machine equipped with a calculator that calculates the upper surface or lower surface position (height) of the straightened material at a set position from the lower roll or the upper roll when the straightened material is assumed to be straight. (See Figure 1)
In this straightening machine, the position (height) of the upper surface or lower surface of the straightened material 8 at the point 1 from the exit roll 2a when the straightened material is assumed to be straight is calculated by the calculator 17,
This is immediately compared with the detection value detected by the position detector 15, and the position of the lower roll 2a is corrected based on the difference. However, immediately after correction, the curvature direction of the material to be straightened changes, and the calculated value differs. Comparison with detected values becomes meaningless.

Therefore, the correction effect becomes clear only when the straightened part of the material to be straightened, which was directly under the upper and lower rolls la immediately after the correction, reaches the position of the position detection roller 3. At this point, the difference between the calculated value and the detected value is calculated. , needs further modification.
Straightening is performed by repeating this operation, but the length of the material to be straightened 8 is about 10 to 15 at most, and therefore the number of times of correction is several times at most. However, since the relationship between the difference between the calculated value and the detected value and the position correction amount of the lower roll 2a is not clear, it is necessary to determine this empirically. Therefore, there is a possibility that an error may be introduced here, and the curvature may become a simple curve as shown in FIG. The object of the present invention is to provide a method for controlling a material to be straightened so that the curvature changes as shown in Fig. 3, without making it equal to the above-mentioned simple curvature, when straightening a material to be straightened using an automatic shape steel straightening machine. There is a particular thing. The automatic shape steel straightening machine to which the method of the present invention is applied will be explained below based on the drawings. In Fig. 1, 1 is an upper roll, 2 is a lower roll, 3 and 4 are bearing chocks, and the lower roll 2 is the bearing chock 4. It is supported by a worm jack 5 fixed on a plywood 18 via a worm jack 5, and is raised and lowered by a motor (not shown).

The lower roll 2a on the exit side is provided with a position detector 6 for detecting its vertical position. This position detector 6 may be provided on each of the other lower rolls 2. 7 is a measuring roller for measuring the speed and thickness t or outer flaw d of the material 8 to be straightened;
It is raised and lowered by a cylinder 10 supported by a support frame 9, and comes into contact with the material to be straightened 8 during operation.

Although not shown, a tachometer 11 is connected to the measuring roller 7. 12 is measuring o-la 7
The thickness t of the material to be straightened 8 is determined by the output signal of the position detector and the output signal from the position detector 6.
Alternatively, the outer pot d is determined.

Reference numeral 13 denotes a position detection roller, which is installed so as to be in contact with the material to be straightened 8 at the position 1 from the lower roll 2a, and is connected to a cylinder 14 attached to a support frame 9, and is moved up and down by its operation. Its elevation and descent are detected by a position detector 15 attached thereto. Reference numeral 16 is a photo cell, and a sequencer is arranged so that the distance 2 between the lower roll 2a and the tip of the material 8 to be straightened can be detected by the output signal of the tachometer 11 after the material 8 to be straightened passes directly under the photo cell 16. is set up.

Also, although not shown in the drawings, when it is assumed that the material 8 to be straightened is straight based on the position detector and the diameter and position of each straightening roll, the set position 1 from the lower roll 2a or the upper roll is determined. A calculator 17 (not shown) is provided for comparing and calculating calculated values of the upper surface or lower surface position of the material 8 to be straightened. In order to straighten a material to be straightened by the method of the present invention using such an automatic shape steel straightening machine, first, the total length L of the material to be straightened 8 is determined.
Measure in advance.

After the start of straightening, as shown in the straightening control diagram in FIG. Correct the image as it is until the correction effect becomes detectable. Next, the difference between the calculated value and the detected value is measured when the undetectable range of b is exceeded (part a2), and the second measurement is performed when half L/2 of the total length of the material to be straightened is straightened. If the correction is made based on the difference in the curvature so that the curvature of the already corrected part is reversed, the inverted curvature can be corrected.

Therefore, the relationship between the curve height Δh and the radius of curvature R is Δh〒L2/station in FIG. 2, but in FIG. 3 according to the method of the present invention, Δh≠L/24R.

In order to obtain an excellent product, it is necessary that this Δh be small. For these reasons, the inverted curve shown in FIG. 3 is more advantageous than the simple curve shown in FIG. 2, and is also easier to control. Of course, in the case of a long material to be straightened, it goes without saying that it may be necessary to invert it even more times.
By using the above-mentioned automatic shape steel straightening machine and operating it according to the method of the present invention, a highly accurate straightened material can be obtained with simple operations.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of an automatic shape steel straightening machine to which the present invention is applied, Fig. 2 is an explanatory diagram of simple bending correction by the conventional method, and Fig. 3 is an illustration of reverse bending correction by the method of the present invention. FIG. 4 is an explanatory diagram of the control method. 1, la... upper roll, 2, 2a, 2b... lower roll,
3, 4... Bearing chock, 5... Worm jack, 6, 12, 15... Position detector, 7...
・Measuring roll, 9...Support frame, 10
, 14... Cylinder, 11... Tachometer, 13... Position detection roller, 16...
Photocell, 17... Arithmetic unit, 18...
plywood. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A detection device that measures the thickness or outer diameter of the straightening portion when a part of the tip of the material to be straightened is straightened, a detection device that measures the vertical distance between the upper and lower straightening rolls, and a detection device that measures the vertical distance between the upper and lower straightening rolls, and the It has a detection device that detects the top or bottom surface position (height) of the material to be straightened at a preset position from the roll, and detects the detection value detected by each of the detection devices, the diameter of each straightening roll, etc. An automatic machine equipped with a calculator that compares and calculates the upper surface or lower surface position (height) of the material to be straightened at the set position from the lower roll or upper roll when the material to be straightened is assumed to be straight. In a shaped steel straightening machine, the position of the exit-side upper roll or exit-side lower roll is automatically or simultaneously corrected so that the curvature changes and reverses at least once or more immediately based on the difference between the calculated value and the detected value. A method for controlling an automatic shape steel straightening machine, characterized in that: