JPS5927245B2 - Control method for roller straightening machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a roller straightening machine for straightening long steel materials, particularly H-beams, I-beams, T-beams and other shape steels, and for straightening their longitudinal bends. Regarding control method.

Shaped steel is manufactured by hot rolling, but due to uneven heat dissipation from the shaped steel during rolling or during cooling after rolling, residual stress due to thermal stress occurs within the shaped steel, and generally the longitudinal It often bends in the direction.

A bent steel section is mechanically straightened to adjust its shape, and a roller straightener is generally used for this straightening.

This roller straightening machine has a roller configuration as illustrated in FIG. 1A. In other words, this roller straightening machine has 4
An upper roller group 1 consisting of 5 rollers and a lower roller group 2 consisting of 5 rollers are provided vertically facing each other, and each roller belonging to the upper and lower roller groups has the same roller axis. - They are arranged in a staggered manner at a constant pitch L in the direction of movement of the material to be straightened so that they do not lie in the vertical plane.

The material to be straightened is straightened by passing between the upper and lower roller groups, for example from left to right.

FIG. 1B is a front view of the roller from the bus line along which the material to be straightened travels. As shown in this figure, each of the upper and lower rollers consists of two roller discs 5|5', and the roller disc interval d can be adjusted to a desired value according to the web width dimension of the H-section steel 6. The roller disc is fixed at a desired position on the roller shaft. When straightening a section steel using a straightening machine having the roller configuration as described above, the rollers of the same size in the upper roller group 1 are fixedly set so that their respective roller axes are on the same horizontal plane 12, Each roller in the lower roller group 2 is empirically set to provide optimal straightening. In this case, each roller of the lower roller group, if its outer diameter is the same as the upper roller, is generally not placed on the same horizontal plane, but rather a line connecting the axes of each roller (hereinafter referred to as an index indicating the setting status of the rollers). (hereinafter referred to as a roller setting pattern) is set so as to have a convex chevron line shape. Therefore, each lower roller is set with a different amount of pressure from the reference surface 13 (hereinafter referred to as a reduction amount). Each upper roller is fixed with its axis aligned with the same fixed horizontal plane 12, but each lower roller has a rolling reduction limit amount from the roller setting pattern depending on the cross-sectional dimension of the material to be straightened, especially the web dimension. If the reduction is greater than this reduction limit amount, significant cracks will occur in the material to be straightened. However, with the above-mentioned roller straightening machine, materials such as H
When straightening a section steel, even if you use a standard roller setting pattern that has been empirically determined to optimize the straightening situation, there may be variations in material bending due to pattern setting errors and differences in shape rolling opportunities. , something that is not fully corrected occurs. As a result, insufficient orthodontic materials often require re-straightening. This is because the settings of the rollers and the determination of whether or not the amount of bending of the material after straightening is within the allowable range have been artificially performed based on the intuition of the operator.

In the end, in the conventional straightening machine control method, there are many materials that are close to the limits of pass/fail judgment, which indicates that it is difficult to manually judge pass/fail. The present invention has been made in order to solve the above-mentioned problems, and provides a method for controlling the rolling reduction of a roller straightening machine so that the bending of the material after straightening is within an allowable range without causing cracking. The purpose is to The gist of the present invention, which was made based on the above object, is to obtain the curvature ρ on the straightening machine entry side of the material to be straightened, more precisely, the axis of the material to be straightened, and to apply the straightening material to a roller straightening machine set to a standard roller setting pattern. After passing through the material, the curvature rate ρ of the shaft of the material to be straightened is determined, and the effective curvature ρ is determined from the curvature rate.

and calculate the effective curvature change amount Δρ, calculate each roller reduction amount in a fixed order until the roller reduction amount calculated by the effective curvature change amount Δρ becomes smaller than a certain amount, for example, a reduction limit value a, The present invention is characterized in that the roller setting pattern is automatically corrected by outputting the roller reduction amount to each roller. The above effective curvature change amount Δρ is Δρ=ρ
Deichiro. Calculate with. Here ρ. is the effective curvature, and ρo=ρ in - ρ out. Incidentally, the curvature ratio refers to the camber ratio per unit length of the material. Next, the present invention will be explained in more detail with reference to examples thereof. In this example, a roller straightening machine consisting of four upper rollers and five lower rollers as shown in FIG. 1 was used.

The diameter of the roller disks 5, 5/ is 1150 mm, the disk thickness t and the disk spacing d are 100 mm and 30 m77, respectively.
! And the horizontal distance (roller pitch) L between the axes of each roller is 13007It7! The distance D between the plane (reference plane) that serves as a reference for determining the rolling reduction amount of the L1 lower roller and a fixed horizontal plane including the axis of the upper roller is 1150 mm.

On the other hand, FIG. 2 shows a schematic diagram of a control system implementing the method of the present invention.

In this control system, 7 is an entry side curvature measuring device which measures the amount of bending of the section steel on the entrance side of the straightening machine, and calculates the curvature ratio ρ based on the amount of bending. Further, 8 is an exit side curvature measuring device. 9 is an electronic computer which inputs the curvature ratio of the material to be straightened on the input side and the output side and performs a predetermined calculation, and the servo mechanism 1
Output to 0.

The servo mechanism 10 operates to lower a predetermined roller in the roller straightening machine 11 according to a command from the electronic computer 9. The curvature measuring device 14 shown in FIG. 3 was used as the detection section of the curvature measuring device. If this curvature measuring device 14 is installed on the entrance and exit sides of the straightening machine, the present invention can be implemented efficiently.

Next, this curvature measuring device 14 will be explained. The curvature measuring device 14 includes a plurality of angle measuring devices 16 and a computing unit 17 connected to these angle measuring devices 16.
The plurality of angle measuring devices 16 are arranged in a straight line between the respective rollers in a direction perpendicular to the axis of the rollers 15 that constitute the roller tables on the entrance and exit sides of the straightening machine. Each angle measuring device 16 consists of a base body 16a and a measuring arm 16b. The base body 16a is arranged at a position X below the roller upper surface 15a of the roller 15, and the base end portion of a rod-shaped measuring arm 16b is supported on this base body 16a. The tip of the measuring arm 16b protrudes slightly by an X from the roller top surface 15a, contacts the H-shaped steel 18 on the roller top surface 15a (the figure shows the H-shaped steel in a posture rotated 900 degrees from the normal rolling H-beam posture), and the base end It is designed to be tilted by an arbitrary angle θ with the fulcrum of the part as the axis.

The base body 16a has an inclination angle θ of this measuring arm 16b.
is detected and the value is transmitted to the arithmetic unit 17. The computing unit 17 is connected to all of the plurality of angle measuring devices 16, and when the H-beam 18 moves in the width direction of the flange, when all the measuring arms 16b come into contact with the H-beam 18, 0 N. becomes the state of The curvature measuring device 14 in this state uses the inclination angle of the measuring arm 16b detected by the angle measuring device 16 in charge of both ends of the H-section steel 18 as a reference, and the measuring arm 16b of each of the other angle measuring devices 16 The degree of displacement of the inclination angle from the reference angle is measured to grasp the bending situation of the H-section steel 18, and then the bending rate ρ can be calculated and output. ρ is calculated by the following formula.Here, 11, 12......, 1i...
. . . 1n-1 represents the respective distance between adjacent angle measuring devices. The curvature ratio ρ is calculated as described above, and after calculating the curvature ratio ρ, the material to be straightened is rotated 900 times and placed on a straightening machine.

Next, using the above roller straightening machine, a cross-sectional shape with a flange thickness of 9 mm, a flange width of 125111, a web thickness of 60 mm, a web width of 232 m and 71 L, and a length of 10
mf) The case of straightening H-shaped steel will be explained.

The curvature ratio of this H-section steel on the straightening machine entry side was 0.1%, and it was a normal steel section with the same rolling chance. In this case, the initial roller setting pattern of the lower roller group is as shown in FIG. That is, the rolling amount from the lower roller reference surface 13 is 0.4 mm for #10-roller 1 and 0.4 mm for #30-roller one.
．． 6m1L1#50-Ra1 is 0.3mm1#70-Ra1 is 0.21n1! L1#90-Ra1 is 0.2U77! It is. And the limit reduction amount is 2mm, and the maximum amount of reduction is #30
-1,41 based on La-1! shall be. The initial setting position of #30-1 is 0.6m7 from the reference plane.
J! This is because, since it was set at a higher level, the limit reduction amount of 27ILm that does not cause cracks in the material to be straightened can be reduced only by 1.4 degrees. Therefore, the maximum rolling amount of each lower roller is set to 1.4 mm. In addition, other than #30-ra1, it is possible to reduce the pressure by 1.47!111L or more before reaching the limit reduction amount of 2 mm, but 1.
Reducing the roller by more than 4 mm is not a good idea as it will greatly change the standard roller setting pattern. In this embodiment, this constant value of 1.4 mm is necessary for calculation by an electronic computer.

Further, although generally the reduction amount Δs of the lower roller is proportional to the effective curvature change amount Δρ, in this straightening machine, the relationship is as shown in FIG. 5. Each straight line in the figure is ΔSi=KiΔρ1
It can be displayed as Here, Ki represents a constant and i represents a roller number. The axis of the lower roller is located on the same horizontal plane, and the vertical amount of the roller axis of any one of the five lower rollers, and therefore the rolling reduction amount Δsi of the roller, is varied;
Effective curvature change amount Δρi of H-section steel when straightening it
This is a graph showing

In the figure, the suffixes attached to Δs represent the lower roller numbers shown in FIGS. 1 and 2, and are assigned sequentially from the straightening machine entry side. When implementing the invention,
A relational expression between Δsi and Δρi is also required. FIG. 6 shows a flowchart for implementing the method of the present invention in the present control system, which will be explained next. In this embodiment, calculations are made to correct the rolling reduction amount in order from the #9 roller on the exit side of the straightening machine, which is set to have a lighter rolling reduction than the others, to the roller on the entrance side of the straightening machine. This is because any other method would result in large variations in the standard roller setting pattern, which is also not a good idea.
First, the curvature ρ input of the H-beam steel at the entrance side of the straightening machine is measured at 19, and then, after passing through a roller straightening machine, the curvature ρ output at the exit side of the straightening machine is similarly measured at 20.

Next, the allowable curvature rate (0.002% in this example) is compared with the ρ output, and if the ρ output is smaller than the allowable curvature rate, proceed to YES, and the standard roller setting pattern is executed without changing at step 22, and the process ends. Go to 35. On the other hand, if ρ out is larger than the allowable curvature rate, proceed to No, calculate the effective curvature rate ρo = ρ input - ρ output, and further calculate the effective curvature rate change Δρi as Δρi = ρ output - ρ
o, and using this Δρi, the fifth
The electronic computer 9 (FIG. 2) that stores the relational expression between Δsi and Δρi shown in the figure calculates the rolling reduction amount ΔS9 of the #9 roller from Δs,=25×Δρ9. 23 represents this execution.

Next, it is determined at step 24 whether this Δs is less than or equal to the lowering limit amount of 1.4 mm. If ΔS9≦1.4mm, proceed to YES, output the rolling reduction amount of the #9 roller at 34, and then proceed to 35. If Δs,>1.4 mm, proceed to No from 24 and perform the calculation of 25. That is, Δs9=25
×Δρ9 at 1.4t and Δs9=1.4mm, Δ
Find ρC=1, calculate 0CVΔρ7=Δρ9−Δρt, and calculate ΔS by ΔS7=K7Δρ7=1.67XΔρ7.
Find 7.

Here, Δ4 is Δρ9 when Δs9=1.4 mm.
And Δρ7 represents the amount of change in effective curvature that cannot be corrected by the #9 roller. After completing the calculation in step 25, the process proceeds to step 26, where it is determined whether ΔS7≦1.4m1L, and if yes, output is made at step 34, and if no, step 27 is reached.

Thereafter, calculations are similarly performed according to the flowchart of FIG. 6, and a corrected roller setting pattern is determined.
Note that if the calculation progresses and reaches 33, it becomes clear that the selection of the standard roller setting pattern is incorrect. However, this usually cannot happen. In this way, the optimum roller setting pattern for straightening the second and subsequent materials is set. In the Doki example, the curvature was defined and used as a control variable, but the same method can be implemented using a known curvature.

If the roller setting pattern set by the method of the present invention is used, the re-straightening rate will be reduced, and the cost of the product can be significantly reduced by eliminating the need for re-straightening.

[Brief explanation of the drawing]

FIG. 1 shows a schematic diagram of the roll configuration of a roller straightening machine, with FIG. 1A showing a side view and FIG. 1B showing a front view. FIG. 2 is a control system diagram of the roller straightening machine. In FIG. 3, A shows a front view and B shows a plan view of the curvature measuring device. FIG. 4 is a graph showing the standard roller setting pattern of the lower roller, and FIG. 5 is a graph showing the relationship between the rolling reduction amount Δsi and the effective curvature rate change amount Δρi of the lower roller. FIG. 6 is a flowchart when the present invention is implemented using the control system shown in FIG. 1... Upper roller group, 2... Lower roller group, 3...
Soil roller, 4...Lower roller 5,5'...
...Roller disk, 6...Drawing steel, 7.
...Enter side curvature measuring device, 8...Output side curvature measuring device, 9...Electronic computer, 10...
... Servo mechanism, 11.・．． ．． ...Roller straightening machine,
12... Fixed horizontal plane, 13... Reference plane, 14...・．． Curvature measuring device, 15...
Roller, 15a...Roller top surface, 16...
... Angle measuring device, 16a ... Base, 16
b...--Measurement arm, 17... Arithmetic unit,
18...Shaped steel, d...Roller disk spacing, t...Roller disk thickness, D...
...Distance between the upper roller axis and the reference surface, L...
...Roller pitch, θ...Arm inclination, 1.
...Distance between angle measuring devices.

Claims (1)

[Claims] 1 In straightening the bends of long materials using a roller straightening machine,
After determining the curvature ρ input of the shaft of the material to be straightened at the input side of the straightening machine and passing the material through a straightening machine set in a predetermined roller setting pattern, determining the curvature ρ output of the shaft of the material to be straightened at the exit side of the straightening machine; Using these curvature ratios, calculate the effective curvature ratio ρ_0 and the effective curvature ratio change Δρ, and calculate the effective curvature ratio change Δρ
A roller that calculates each roller reduction amount in a fixed order until the required roller reduction amount calculated using the above becomes smaller than a certain value, and outputs the roller reduction amount to each roller to determine a corrected roller setting pattern. How to control the straightening machine.