JPH0763765B2 - Straightening method for H-section steel - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for straightening an H-shaped steel sheet that has been hot-rolled or cold-rolled or formed, and an apparatus therefor.

[Prior Art] Generally, as shown in FIG. 8, the H-section steel 3 is formed by a universal mill 4 (U mill) having coaxially upper and lower horizontal rolls 1 (H rolls) and vertical rolls 2 (V rolls). Hot formed. The hot-formed H-section steel is conveyed by the roller table 5 in the manufacturing process as shown in FIG. 12, first sawed by a saw 6 to a predetermined length, and then cooled to room temperature in the cooling bed 7. Then, the warp or bending that occurred during cooling was corrected by the roller straightening machine 8.

[Problems to be solved by the invention]

However, during rolling, the upper and lower horizontal rolls move in the roll axial direction due to backlash, elastic deformation, etc. As an example, the flange a of the H-section steel 3 has different left and right and upper and lower flange thicknesses, as shown in FIG. Sometimes. Also, the temperature difference between the inner and outer surfaces of the flange, the difference in the cooling process, the web b and the flange a.
There is a temperature difference between the base c and the flange a. As a result of these, the H-section steel 3 after cooling is likely to be deformed in a right angle as shown in FIG. These deformations are caused by the roller straightening machine 8 (Fig. 12).
Since it is not possible to straighten with this, press straightening or heat straightening shown in Fig. 11 will be performed, but since all of these works depend on the sensitivity of the worker, workability, productivity, labor saving,
It is a big problem in terms of quality.

On the other hand, as a technical means for correcting the squareness, Japanese Patent Laid-Open No.
No. -50263 is disclosed, which is two sets of a straightening roll for expanding both flanges to the outside and a finishing straightening roll for pushing both flanges inward on the outside of the H-section steel flange. There is a problem that the rolls must be installed on the same line.

An object of the present invention is to solve these problems, and to provide a straightening method for straightening H-section steel and an apparatus thereof for automating the straightening work which has conventionally depended on the sensitivity of a worker to improve productivity. It is provided.

[Means for solving problems]

The present invention solves the above problems and adopts the following technical means. That is, the squareness straightening method of the H-section steel of the first invention measures the squareness of the H-section steel by detecting the side surface positions of the three points on the flange of the cross section of the H-section steel before straightening, the middle and the bottom. Then, the required pressing amount by the pressing roller is calculated from the deformation amount of the flange and the springback amount due to the flange thickness, the outer surface of the flange is indented and corrected based on the calculated value, and then the straightened H-shaped steel straightened. In this method, the angle is measured and the measurement result is fed back to the calculated value of the pressing amount of the pressing roller.

A squareness straightening device for H-section steel according to a second aspect of the present invention is an apparatus for suitably carrying out the method according to the first aspect of the present invention, in which (1) a web of H-section steel is pressed from both sides to form the H-section steel. It consists of a restraint device for restraining, and (2) a pair of pushing devices that press both side surfaces of the H-section steel flange to give independent plastic deformation amounts to each flange. It consists of two restraint rollers that restrain the web from both sides, and a cylinder that presses each restraint roller. The pair of pushing devices is a pair of pushing devices that push the side surface of the H-section steel flange from both sides in the width direction of the flange. Pushing rollers, two chocks for holding each pushing roller, a frame with a guide groove for guiding each support pin of the chock, and the spacing between both chocks is adjusted to change the mutual spacing of the pushing rollers. Cylinder and each push row It consists of a cylinder that adjusts the inclination angle of the rotary shaft of the rotor with respect to the flange surface of the H-section steel, and a cylinder that presses both chocks and presses each pressing roller against the flange of the H-section steel.

[Action]

The squareness correcting action of the H-section steel of the present invention will be described. The squareness defect as shown in FIG. 10 which occurs in the cooling process after hot rolling is determined by using the squareness straightening device for H-section steel of the present invention shown in FIG.
As shown in FIG. 4 (a), the H-section steel has a springback action by independently applying plastic deformation to each flange a (solid line shows before straightening, chain line shows straightening) and then unloading. As a result, the squareness of the web b and the flange a is corrected as shown by the solid line in FIG. 4 (b).

The straightening action will be further described with reference to FIG. 1. The H-section steel 3 is constrained by a restraint device 25 composed of upper and lower restraint rollers 26 and an elevating cylinder 29 that presses the restraint rollers 26 from above and below. On the other hand, as shown in FIG. 2, the pushing device 24 (only one left side is shown) operates the cylinders 15 and 21 to set the shafts 12 (rotating shafts) of the two pushing rollers 11 at a predetermined angle. Then, the cylinder 19 is operated, and the pushing roller 11
Thus, it is possible to press each flange of the H-section steel 3 with a predetermined force to give a plastic deformation in consideration of the springback amount.

Further, as a straightening method, as shown in the flowchart of FIG. 5, the side angles of three points on the flange of the cross section of the H-section steel before straightening are detected to measure the squareness of the H-section steel. Then
The amount of pushing required by the pushing roller is calculated from the amount of deformation of the flange and the amount of springback due to the thickness of the flange, the outer surface of the flange is pushed and corrected based on the calculated value, and then the squareness of the H-shaped steel after straightening is calculated. The measured value is fed back to the calculated value of the pushing amount of the pushing roller to control the pushing amount by the straightening pushing roller, and the squareness of the straightened H-section steel can be accurately maintained over the entire length.

Therefore, the method and apparatus for straightening H-section steel according to the present invention can improve the product quality and productivity by automating the work which has conventionally depended on the sensitivity of the employee, and save labor.

Further, unlike the conventional apparatus, there is no need for two sets of straightening rollers on the same line, and the facility cost can be reduced.

〔Example〕

The manufacturing process of the H-section steel according to the present invention is shown in FIG. In the present invention, a shape measuring device 9, a straightening device 10, and a pushing amount control correction system, which are the features of the present invention, are added after the roller straightening device 8 of the conventional example (FIG. 12).

An embodiment of the present invention will be described in detail with reference to the drawings, in detail, such as a straightening device, a shape measuring device, a pushing amount control correction system, and an operation of the straightening device.

(1) Straightening device As shown in FIG. 1, the straightening device includes a pushing device 24 and a restraining device 25.
Can be roughly divided into

The pushing device 24 includes two sets of pushing rollers 11 each of which is configured to push both side surfaces of the H-section steel flange from both sides in the width direction of the flange (only one set on the left is shown in FIG. 1). A shaft 12, a push roller 11 and an upper and lower chock 13 rotatable about a support pin 14 supporting the shaft 12, and a cylinder 15 for adjusting the interval between the upper and lower chock according to the flange a width dimension of the H-shaped steel 3. The pin 16 that connects the rod of the cylinder 15 and the chock 13 and the chock 13 moves up and down by operating the cylinder 15, but the support pin on the chock 13
A frame 17 with a guide groove 18 for guiding 14
A cylinder 19 for pushing the flange a by shifting the frame 17 left and right, a pin 20 for connecting the cylinder 19 and the frame 17, and a cylinder 21, a cylinder 21 and a chock 13 for rotating the chock 13 around the support pin 14. It is composed of a pin 22, a groove 23 and the like for connecting the.

The restraint device 25 is a device for preventing the H-shaped steel 3 from moving or being deformed when the flange a is pushed by the pushing device 24. The restraint roller 26, the shaft 27, and the restraint roller 26 are provided.
And a chock 28 that supports the shaft 27, an elevating cylinder 29 that elevates and lowers the restraining roller 26, a pin 30 that connects the elevating cylinder 29 and the chock 28, and the like.

Further, as shown in FIG. 2, when the chock 13 is rotated around the support pin 14 to press and bend the flange a portion of the H-shaped steel 3, the pin 16 and the chock 13 connecting the cylinder 15 and the chock 13 to each other. Since the connection point of moves to the left and right relatively
An elongated hole 31 is provided in 13.

(2) Shape Measuring Device FIG. 4 shows the shape measuring device. Figure 4 (a) shows H
The movement of the flange a of the shaped steel 3 and the principle of measurement are described. The solid line shows the H-shaped steel 3 before straightening and the dotted line shows the H-shaped steel 3 under straightening.

The measuring device has left and right reference lines P and Q (the distance between P and Q is D. It may be changed appropriately according to the size of the H-section steel 3).
To the flange a of the H-section steel 3 is composed of three sets of distance meters 32, 32a, 33, 33a, 34, 34a.

(3) Pushing amount control correction system Next, the pushing amount control system will be described with reference to FIG. Even if the squareness of the flange a is corrected, the size of the central part of the flange remains unchanged.
l _0, l ₀ 'to measure the (right and left of the reference point P, the distance from Q to the flange central), basic dimensions of H-beams _{= D- (l 0 + l 0} ' to determine). Next, the positions of the upper and lower ends of the flange are measured using distance meters 32, 32a and 34, 34a, and l ₁ , l ₁ ′ (distance from left and right reference lines P, Q to the upper end of the flange), l ₂ ,
l ₂ ′ (distance from left and right reference lines P and Q to the lower end of the flange) is obtained. By this measurement, as shown in FIG. 2, the pushing amount α considering the springback amount δ after correction is determined. Explaining the upper part of the left flange in FIG. 4 (a) as an example, the pushing amount α = l ₀ −l ₁ + δ = L ₁ −l ₁ . Here, L ₁ is the distance from the reference line P after pushing and the upper end of the flange. This springback amount δ varies depending on the flange thickness and flange width, but the flange width 30
The relationship between the thickness and the springback amount δ for 0 mm is shown in the graph of FIG. The springback amount δ hardly affects the initial displacement amount (l ₀ −l ₁ ).

The distance from the left and right reference lines P and Q to the flange surface
Since l ₀ and l ₀ ′ vary depending on the length direction of the H-section steel, the pushing device 24 of the straightening device 10 shown in FIG.
Equipped with (automatic gauge control) function.

Next, the pushing amount correction system will be described. Similar to the distance measurement before straightening shown in FIG. 4 (a), the distance between the flange of the H-section steel after straightening and the left and right reference lines is measured as shown in FIG. 4 (b). In this case, the left and right reference lines P and Q need to have the same configuration as the left and right reference lines P and Q in FIG. If the distances between the reference point, the center of the flange, and the upper end of the flange are l ₀ and l ₃ , respectively, there is no problem if l ₀ ≈l ₃ , but when l ₀ ≠ l ₃ , (l ₀ −l ₃ ) The cylinder 19 is operated to increase or decrease the pushing amount α. The operation of the cylinder 19 may be arbitrarily performed within one product. The pushing amount control system and the correction control system described above are shown in FIG. It should be noted that the flow chart shows only the straightening treatment of the upper portion of the left flange of one H-section steel in order to avoid complexity.

(4) Operation of the straightening device The pushing device 24 is set as shown in FIG. 2 according to the pushing amount α and the pushing angle which are determined at the same time when the H-section steel arrives at the straightening device.

First, the cylinders 15 and 21 move to set the roll position according to the flange width, and the support pin 14 guided by the guide groove 18 of the frame 17 moves up and down to determine the position of the chock 13. Next, in order to make the inclination of the shaft 12 of the pushing roller 11 an inclination angle according to the springback amount δ, the cylinder 21 operates and the chock 13 rotates about the support pin 14 to rotate the roll 11
Is completed.

In this state, the cylinder 19 operates and the frame 17 and the support pin 1
4. Through the chock 13, the roll 11 pushes the flange to the position shown by the solid line in FIG. 2 according to the information from the shape measuring device 9. In this state, the transportation of the H-section steel proceeds, and as shown in the flowchart of FIG. 5, the squareness correction is continuously performed while repeating the shape measurement of the H-section steel.

The web height in the length direction of the H-section steel ((D- (l ₀ + l ₀ ′)) in FIG. 4 (a)) may vary. At this time, the cylinder 19 is measured by the measurement value of the shape measuring device 9 before straightening.
Is operated according to the variation value, and the pushing amount α is always a constant value.

Since the pushing force required to push the flange is related to the flange thickness as shown in FIG. 7, it is necessary to provide the cylinder 19 with a capability adapted to the flange thickness and steel type of the H-section steel.

In the above, one embodiment of the present invention has been described only with respect to the flange on one side, but it goes without saying that a similar pushing device 24 is also provided on the flange on the opposite side.

〔The invention's effect〕

The squareness straightening method and apparatus for H-section steel of the present invention have the following excellent effects.

By automating the work that depends on the sensitivity of the worker, it is possible to improve the product quality and productivity and save labor.

Unlike the conventional device, two sets of straightening rollers are not required, and the facility cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a straightening device according to an embodiment of the present invention, FIG. 2 is a diagram for explaining a straightening action of FIG. 1, FIG. 3 is a diagram for explaining an H-section steel manufacturing process according to the present invention, and FIG. FIG. 5 is an explanatory view of the shape measuring apparatus of the present invention, FIG. 5 is a flow chart of the pushing amount control and correction system of the present invention, FIG. 6 is a relationship graph between flange thickness and spring back amount, and FIG. 7 is flange thickness and pushing force. FIG. 8 is an explanatory view of manufacturing a H-section steel by a universal mill, FIG. 9 is an explanatory view of deformation of the H-section steel,
FIG. 10 is various deformation diagrams of the H-section steel after cooling, FIG. 11 is a conceptual diagram of press straightening of the H-section steel, and FIG. 12 is an explanatory diagram of a conventional H-section steel manufacturing process. 1 ... Horizontal roll, 2 ... Vertical roll 3 ... H-shaped steel, 4 ... Universal mill 5 ... Roller table, 6 ... Sawing machine 7 ... Cooling bed, 8 ... Roller straightening machine 9 ... Shape measuring device, 10 …… Correcting device 11 …… Pushing roller, 12 …… Shaft 13 …… Chock, 14 …… Support pin 15 …… Cylinder, 16 …… Pin 17 …… Frame, 18 …… Guide groove 19… … Cylinder, 20 …… pin 21 …… Cylinder, 22 …… pin 23 …… groove, 24 …… pushing device 25 …… restraining device, 26 …… restraining roller 27 …… shaft, 28 …… chock 29 …… up and down Cylinder, 30 ...... Pin 31 …… Slot, 32, 32a, 33, 33a, 34, 34a …… Distance meter a …… Flange, b …… Web, c …… Stick α …… Pushing amount, δ… … Springback amount D, L ₁ , l ₀ , l ₀ ′, l ₁ , l ₁ ′, l ₂ , l ₂ ′, l ₃ …… Distance,
P, Q ... Reference point

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Katayama 1-chome, Mizushima Kawasaki-dori, Kurashiki City, Okayama Prefecture (no address) Inside the Mizushima Works, Kawasaki Steel Co., Ltd. (56) References: Japanese Patent Publication No. )

Claims (1)

[Claims] 1. A flange on a cross section of H-section steel before straightening, on, inside,
The squareness of the H-section steel is measured by detecting the side positions of the lower three points, and the required amount of pushing by the pushing roller is calculated from the deformation amount of the flange and the springback amount due to the flange thickness, and based on the calculated values. The outer surface of the flange is indented and straightened, and then the squareness of the H-shaped steel after straightening is measured, and the measurement result is fed back to the calculated value of the required pushing amount of the pushing roller. Straightening method for steel.