JPH02142618A - Automatic straightening device for welded h-shaped steel - Google Patents

Abstract

PURPOSE:To prevent automatic straightening devices from malfunctioning or being broken by detecting the amount of bend of a welded H-shape steel and the temperature of its upper and its lower flange, making an arithmetic processing of them, obtaining the amount of bend and the amount of warpage of the welded H-shape steel and outputting the amounts of correction corresponding to these amounts to the straightening machines. CONSTITUTION:The bend and warpage of the welded H-shape steel are straightened by each straightening machine 1, 2, 3 in which the amounts of straightening are controllable. At succeeding stages in the straightening machines 1, 2, 3 the amount of bend is detected by a detector 5 for the amount of bend through an amount of movement of a contactor abutting the web W of the welded H-shape steel. The temperatures of the upper and the lower flange of the welded H-shape steel are detected by thermometers 6. The amount of bend and the amount or warpage of the welded H- shape steel are obtained by an arithmetic processing unit 7 through an arithmetic processing of signals from the detector 5 for the amount of bend and the thermometers 6 and the amounts of correction of the straightening machines corresponding to these amounts are outputted to the straightening machines 1, 2, 3. By this method, the automatic straightening devices can be prevented from malfunction and breakage.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can automatically determine the bending of a welded H-section steel, automatically adjust the reduction amount of a straightening machine according to the amount of bending, and
This invention relates to an automatic straightening device that also enables warp straightening through temperature control.

[Subject skill]

As shown in Fig. 6, the straightening process for welded H-section steel includes a flange rolling method consisting of a lower flange rolling straightening machine 1 and an upper flange rolling straightening machine 2, and a roll leveling method using a web roll leveling straightening machine 3. In the flange rolling method, the elongation of the material due to cold rolling is used to straighten warps and bends, and in the web roll leveling method, the material is repeatedly bent to straighten the bends. is being corrected.

Conventionally, in such a straightening process, there have been the following problems.

(i) The rolling method of the flange line uses a screwdriver to adjust the amount of rolling reduction, which makes adjustment difficult because automatic intervention is not possible and at the same time, the amount of rolling reduction cannot be quantified.

(11) Since shapes such as bending and warping are determined by human visual inspection, variations in product shape occur frequently, which causes defective products.

(iii) It is necessary to constantly perform visual inspections, which places a heavy burden on the operator.

In order to solve these problems, the applicant has already developed +
The bending of the web of 1-section steel is detected by a sensor such as a contact limit switch or a non-contact proximity switch.
A straightening method that corrects the roller position of a straightening machine based on this measurement value (Japanese Patent Application Laid-open No. 70923/1982), or detects the bending and warpage of the welded H-section steel with a TV camera, and An application has been filed for an automatic straightening device (Japanese Patent Application Laid-open No. 84829/1983) that automatically adjusts the reduction amount of each straightening machine.

[Problems to be solved by this invention]

However, in the former case, there are disadvantages such as damage to the sensor when the nose curve is large, malfunction due to attached scale, and the need to adjust the gap between the web and the sensor, and in the latter case, equipment costs are high. In addition, it requires a mounting location and has the disadvantage of creating a poor working environment.

This invention was made to solve these problems, and its purpose is to be able to detect bends without causing malfunction or damage, to make the detection equipment inexpensive, and to reduce the cost of the hour wheel. An object of the present invention is to provide an automatic straightening device for welded H-beam steel that can automatically straighten warps with a simple configuration.

[Means to solve the problem]

The automatic straightening device according to the present invention makes it possible to adjust the amount of each straightening m1゜2.3 by a drive mechanism such as a hydraulic cylinder or a motor, and in the latter stage of these straightening machines, welded H-section steel is Contactor 5 in contact with web W
The bending amount detector 5 having the bending amount B detects the bending of the welded H-section steel, and the temperature of the upper and lower flanges F after welding is detected using the thermometer 6, and these bending amount detectors 5,
The signal from the thermometer 6 is processed by the arithmetic processing unit 7 consisting of a microcomputer to determine the amount of bending and warping of the welded H-shaped pond, and the amount of correction corresponding to the amount of bending and warping is applied to each straightening machine. feedback to the drive mechanism of
This allows for automatic correction.

[For production]

Based on the amount of bend detected by the amount of bend detector 5, as shown in FIG.
Adjust the amount of reduction of the web straightening machine 3. That is, the bending of the flange F is corrected by changing the rolling amount of the left and right rolling rolls of the flange straightening machine 1.2, and the bending of the web W is corrected by changing the rolling amount of the leveling rolls of the web straightening machine 3. Here, since the bending amount detector 5 has a structure that detects bending based on the amount of movement of the contactor 5B, there is no malfunction due to attached scale, and the sensor body is not damaged due to the H-shaped steel having a large nose bend. Furthermore, since it is not expensive like a TV camera, equipment costs can be reduced.

Regarding warping caused by upper and lower flanges at room temperature, see Section 4.
As shown in the figure, the temperature of the upper and lower flanges F is detected by a thermometer 6, the amount of warpage is determined based on this temperature difference, and the reduction amount of the flange straightening machines 1 and 2 is increased or decreased depending on the amount of warpage.

FIG. 5 shows the bending and warping due to the temperature difference between the upper and lower flanges F, and it can be seen that the flange temperature difference greatly affects the warping. Therefore, warping can be eliminated by adjusting the amount of reduction based on the temperature difference.

〔Example〕

As shown in FIG. 1, the weld H cut by the cutting machine 4
The bending of the section steel H is detected by a bending amount detector 5. As shown in FIG. 2, this bending amount detector 5 is made of a resin contact 5B.
It is composed of a linear gauge 5A that can measure the amount of movement of this contactor 5B, and a spring 5C that can absorb shock,
The detected value of a linear gauge 5A can be displayed on a digital counter 8. Also, this digital counter 8
The output is input to the arithmetic processing device 7.

A pair of upper and lower infrared thermometers 6 capable of detecting the temperature of the upper and lower flanges F are disposed upstream of the lower flange correction ml, and the detected values of the thermometers 6 are input to the arithmetic processing unit 7.

The reduction amount of the flange straightening machines I and 2 is adjusted using hydraulic cylinders, and the roll leveling type reduction blade is controlled by the motor rotation speed N.
and the load current I, and the arithmetic processing unit 7 automatically adjusts the reduction amount.

In the arithmetic processing unit 7, correction amounts for each rolling reduction amount corresponding to the bending amount and the flange temperature difference are registered, and the bending and warpage are appropriately corrected based on the bending detection signal and the temperature signal.

〔Effect of the invention〕

As mentioned above, the automatic straightening device according to the present invention detects the bending of the welded H-section steel using a bending amount detector having a contact, determines the warp by detecting the temperature difference between the upper and lower flanges, and detects the bend and warp. The automatic correction has the following effects.

(1) Malfunctions caused by scale adhesion and damage caused by the steel material on the nose surface can be prevented.

(ii) Unlike conventional sensors, there is no need to adjust the gap between the sensor and the web.

(iii) It is cheaper than conventional TV cameras and does not take up much space for installation.

(iv) Warp can be automatically corrected with a simple configuration by detection using a thermometer.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an automatic correction device according to the present invention;
Figure 2 is a schematic diagram showing the bending amount detector, Figures 3 and 4.
FIG. 5 is a chart showing the system configuration of the microcomputer, FIG. 5 is a graph showing the relationship between flange temperature and warpage, and FIG. 6 is a schematic diagram showing the straightening process. 1...Pa lower flange straightening machine 2...Upper flange straightening machine 3...Web straightening machine 4...Cutting machine 5
...Bending amount detector, 6...Thermometer 7.
... Arithmetic processing unit 8 ... Digital counter Fig. 1 Fig. 2 α) o. qfu

Claims (1)

[Claims] (1) A straightening machine that straightens the bends and warps of welded H-section steel, and the amount of correction can be adjusted by a drive mechanism, and a contact that is disposed after this straightening machine and abuts against the web of welded H-section steel. a bending amount detector that can detect the bending of the welded H-shaped steel according to the amount of movement of the welded H-shaped steel; a thermometer that detects the temperature of the upper and lower flanges of the welded H-shaped steel; and a computer that calculates signals from the bending amount detector and the thermometer. A welding H characterized by being equipped with an arithmetic processing device that calculates the amount of bending and warping of the welded H section steel and outputs the correction amount of the straightening machine corresponding to the amount of bending and warping to the straightening machine.
Automatic straightening device for shaped steel.