Roller ring configuration method of horizontal roller type straightening machine for controlling straightening cracks of H-shaped steel

Abstract

The invention relates to the field of control modes of H-shaped steel straightening cracks, and discloses a roller ring configuration method of a horizontal roller type straightening machine for controlling the H-shaped steel straightening cracks, and the roller ring configuration method of a P straightening roller comprises the following steps: S1, detecting a height difference h between a first roller ring and a second roller ring of the P straightening roller under a set rolling reduction; s2, marking the vertex of the left side of the first roller ring of the straightening roller P as a point a, marking a point, which is h away from the vertex, of the right side of the second roller ring as a point b, and connecting the point a and the point b to form a virtual cutting line; s3, cutting the first roller ring and the second roller ring of the P straightening roller along the virtual cutting line under the condition of rotation; the P straightening roll is the Pth straightening roll in the straightening direction of the horizontal roll type straightening machine, and P is a natural number larger than 0. The method is relatively simple, and under the existing production condition, the crack of the H400 * 200 profile steel after correction is effectively controlled in the production by redesigning the roller surface.

Description

Technical Field

[0001] The invention relates to the field of control methods for H-beam straightening cracks, and in particular to a roller ring configuration method of a horizontal roller straightening machine for controlling H-beam straightening cracks. Background Art

[0002] H-shaped steel has excellent strength, rigidity and stability, and is widely used in the engineering field, such as bridge engineering, high-rise buildings, industrial plants, shipbuilding, railway engineering, etc., involving all aspects of life. In order to ensure the safety of use, crack defects that may occur during the production process must be avoided. The process flow of hot-rolled H-shaped steel is: continuous casting billet → heating → high-pressure water descaling → BD rough rolling mill → universal finishing rolling → cooling bed cooling → straightening → cold saw cutting → inspection → bundling. After the steel is hot-rolled, it is straightened by repeated bending through upper and lower rollers. Since the cantilever straightening machine shaft is suspended on one side of the arch, the shaft will deviate in the radial direction under the action of the straightening pressure during the straightening process. The pressure on the side of the rolled piece close to the arch is large, and the pressure on the side away from the arch is small. Due to uneven force, cracks are easily generated at the connection between the flange and the web during the straightening process, and there are major hidden dangers in the quality of the steel after straightening.

[0003] In production practice, straightening cracks often occur in H400*200 steel during the straightening process. This is because the waist thickness of this type of steel is thinner than that of other specifications of steel and it is more sensitive to pressure. The existence of straightening cracks will directly affect product quality and cause great economic losses. Summary of the invention

[0004] The purpose of the present invention is to overcome the problem that H400*200 steel is prone to cracks after straightening in actual production, and to provide a roller ring configuration method for a horizontal roller straightening machine for controlling H-shaped steel straightening cracks. The method modifies the inclination of the roller surface of the straightening roller to make the force on the east and west sides of the straightening roller uniform, thereby eliminating the straightening cracks.

[0005] In order to achieve the above-mentioned object, the present invention provides a roller ring configuration method of a horizontal roller straightening machine for controlling H-beam straightening cracks, wherein the horizontal roller straightening machine comprises a plurality of lower straightening rollers and an upper straightening roller arranged along a straightening direction, wherein the lower straightening roller and the upper straightening roller each comprise a first roller ring and a second roller ring, wherein the first roller ring and the second roller ring are both arranged on a roller shaft, and a plurality of spacers are arranged between the first roller ring and the second roller ring, and the roller ring configuration method for the P-number straightening roller comprises the following steps:

[0006] S1, detecting the height difference h between the first roller circle and the second roller circle of the P-number straightening roller at a set pressing amount;

[0007] S2, the vertex on the left side of the first roller circle of the straightening roller No. P is recorded as point a, the point on the right side of the second roller circle at a distance h from the outer side of the circumference is recorded as point b, and the two points ab are connected to form a virtual cutting line;

[0008] S3, cutting the first roller circle and the second roller circle of the P straightening roller along the virtual cutting line under the condition of rotation;

[0009] Among them, the P-numbered straightening roller is the P-th straightening roller along the straightening direction of the horizontal roller straightening machine, and P is a natural number greater than 0.

[0010] Preferably, P=2n, 1≤n≤3, and n is an integer.

[0011] Preferably, the first roller ring and the second roller ring are both located at one end of the roller shaft.

[0012] Preferably, the first roller ring is a roller ring far away from the arch of the horizontal roller straightening machine, and the second roller ring is a roller ring close to the arch of the horizontal roller straightening machine.

[0013] Preferably, the first roller ring and the second roller ring are both circular ring structures.

[0014] Preferably, the outer diameters of the first roller ring and the second roller ring are both 860 mm to 1100 mm, and the inner diameters are both 599 mm to 601 mm.

[0015] Preferably, the thickness of the first roller ring and the second roller ring are both 99.5-100.5 mm.

[0016] Preferably, the distance between the first roller ring and the second roller ring is 170-172 mm.

[0017] Preferably, in step S1, the set pressing amount is 5 to 20 mm.

[0018] Preferably, in step S1, a level meter and a feeler gauge are used to detect a height difference h between the first roller circle and the second roller circle of the P-number straightening roller.

[0019] This method is relatively simple. Under the existing production conditions, the process production can be carried out without major changes to the production equipment and process flow. By redesigning the roller surface, the post-correction cracks of H400*200 steel were effectively controlled in production, and no post-correction cracks were found after the improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of steel straightening by a horizontal roller straightening machine;

[0021] Figure 2 is a schematic diagram of the height difference h between the first roller circle and the second roller circle;

[0022] Figure 3 1. It is a schematic diagram of cutting of the first roller circle and the second roller circle;

[0023] Figure 4 This is a schematic diagram of the first roller circle and the second roller circle of the No. 2 straightening roller after cutting;

[0024] Figure 5 This is a schematic diagram of the first roller circle and the second roller circle of the No. 4 straightening roller after cutting;

[0025] Figure 6 This is a schematic diagram of the first and second roller circles of the No. 6 straightening roller after cutting.

[0026] Description of Reference Numerals

[0027] 1First roller circle 2Second roller circle

[0028] P1 No. 1 straightening roller P2 No. 2 straightening roller P3 No. 3 straightening roller P4 No. 4 straightening roller

[0029] P5 No. 5 straightening roller P6 No. 6 straightening roller P7 No. 7 straightening roller P8 No. 8 straightening roller DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments provided by the present invention can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0034] The present invention provides a roller ring configuration method of a horizontal roller straightening machine for controlling H-shaped steel straightening cracks, wherein the horizontal roller straightening machine comprises a plurality of lower straightening rollers and an upper straightening roller arranged along a straightening direction, wherein the lower straightening roller and the upper straightening roller each comprise a first roller ring 1 and a second roller ring 2, wherein the first roller ring 1 and the second roller ring 2 are both arranged on a roller shaft, and a plurality of spacers are arranged between the first roller ring 1 and the second roller ring 2, and the roller ring configuration method for the P-number straightening roller comprises the following steps:

[0035] S1, detecting the height difference h between the first roller ring 1 and the second roller ring 2 of the straightening roller No. P at a set pressing amount;

[0036] S2, the vertex on the left side of the first roller ring 1 of the straightening roller No. P is recorded as point a, the point on the right side of the second roller ring 2 at a distance h from the outer side of the circumference is recorded as point b, and the two points ab are connected to form a virtual cutting line;

[0037] S3, cutting the first roller ring 1 and the second roller ring 2 of the straightening roller No. P along the virtual cutting line under the condition of rotation;

[0038] Among them, the P-numbered straightening roller is the P-th straightening roller along the straightening direction of the horizontal roller straightening machine, and P is a natural number greater than 0.

[0039] In a specific embodiment of the present invention, the horizontal roller straightening machine used is an eight-roller cantilever straightening machine, which is composed of two rows of staggered straightening rollers, and its working schematic diagram is as shown in FIG. Figure 1 As shown, the horizontal roller straightening machine includes 8 straightening rollers, among which the straightening rollers numbered 2, 4, 6 and 8 along the straightening direction of the horizontal roller straightening machine (i.e. the 2nd, 4th, 6th and 8th straightening rollers along the straightening direction of the horizontal roller straightening machine) are upper straightening rollers, and the straightening rollers numbered 1, 3, 5 and 7 (i.e. the 1st, 3rd, 5th and 7th straightening rollers along the straightening direction of the horizontal roller straightening machine) are lower straightening rollers (the roller diameters of the lower straightening rollers are all the same, and the roller diameters of the upper straightening rollers may be the same or different).

[0040] Each straightening roller includes a first roller ring 1 and a second roller ring 2. The first roller ring 1 and the second roller ring 2 are both arranged on the roller shaft of the straightening roller, and a plurality of gaskets are arranged between the first roller ring 1 and the second roller ring 2. The size and number of the gaskets are determined according to the standards required by the specific working conditions.

[0041] The first roller ring 1 and the second roller ring 2 in the present invention are both fixedly connected to the shaft sleeve and are both located at one end of the roller shaft.

[0042] In a specific case, in the present invention, the first roller ring 1 is a roller ring away from the arch of the horizontal roller straightening machine, and the second roller ring 2 is a roller ring close to the arch of the horizontal roller straightening machine.

[0043] In the preferred embodiment of the present invention, the first roller 1 and the second roller 2 are both circular ring structures; wherein the first roller 1 and the second roller 2 are of the same size, the outer diameters of the first roller 1 and the second roller 2 are both 860 mm to 1100 mm, and the inner diameters are both 599 to 601 mm; the thicknesses of the first roller 1 and the second roller 2 are both 99.5 to 100.5 mm; and the distance between the first roller 1 and the second roller 2 is both 170 to 172 mm.

[0044] During the actual straightening process of the cantilever straightening machine, the upper straightening roller will leave the horizontal position and tilt upward (the farther the roller ring of the cantilever straightening machine is from the archway after being stressed, the higher it tilts; the lower straightening rollers are fixed, and the roller surfaces are on the same plane, otherwise straightening cannot be performed. The upper straightening roller can move up and down, and the pressure is given by the up and down movement of the upper straightening roller. Generally, the greater the pressure, the higher the tilt, and the greater the impact on straightening). The greater the amount of pressure, the higher the tilt. The amount of pressure of the straightening machine is: No. 2 straightening roller> No. 4 straightening roller> No. 6 straightening roller Roller>No. 8 straightening roller, the pressing amount of No. 8 straightening roller is very small, and the warping can be ignored. It is these warping that will cause uneven force due to pressure difference, and then cause the appearance of straightening cracks. In the straightening process, the warping of the straightening roller is difficult to eliminate. In order to avoid the straightening cracks, the pressure difference caused by the warping of the straightening machine shaft must be offset in some way. The present invention can effectively offset the pressure difference caused by the warping of the straightening machine shaft by changing the roller surface of the straightening roller from a plane to an inclined surface (i.e., cutting the first roller ring 1 and the second roller ring 2 of the straightening roller).

[0045] In the preferred case, during the straightening process, since the warping of straightening roller No. 8 can be ignored, and the lower straightening rollers (straightening roller No. 1, straightening roller No. 3, straightening roller No. 5 and straightening roller No. 7) are all fixed and will not warp (that is, the height difference h can be regarded as 0), straightening rollers No. 1, 3, 5, 7 and 8 will hardly bring about pressure differences. Therefore, in the present invention, there is no need to process straightening rollers No. 1, 3, 5, 7 and 8, and it is only necessary to change the roller surfaces of straightening rollers No. 2, 4 and 6 from flat surfaces to inclined surfaces.

[0046] Therefore, further, since the present invention only needs to cut the first roller ring 1 and the second roller ring 2 of the straightening rollers No. 2, 4 and 6, P = 2n, 1≤n≤3, and n is an integer.

[0047] Since the arch accuracy of the straightening machine will change with the use time, it is necessary to measure the runout of each straightening roller through trial straightening, that is, the height difference h between the first roller ring 1 and the second roller ring 2.

[0048] In a specific implementation of step S1, a horizontal roller straightening machine is used to straighten a piece of steel at a set pressing amount. The horizontal roller straightening machine is stopped after the steel passes through straightening roller No. 8. Since straightening rollers No. 2, 4 and 6 will leave the horizontal position and tilt up when straightening the steel, the first roller ring 1 and the second roller ring 2 of straightening rollers No. 2, 4 and 6 are not on the same plane (the roller ring away from the arch of the horizontal roller straightening machine will tilt up, and the roller ring close to the arch of the horizontal roller straightening machine will be pressed down), forming a height difference h. At this time, the height difference h between the first roller ring 1 and the second roller ring 2 of each straightening roller can be measured by a spirit level and a feeler gauge (a spirit level with a feeler gauge), as shown in FIG. Figure 2 shown.

[0049] Furthermore, according to actual usage requirements, in step S1, the set pressing amount is 5 to 20 mm; the pressing amount is the straightening pressure. Different varieties of straightening pressure will have an empirical value. If the pressure is not controlled, bending or cracking may occur. The greater the pressure, the greater the height difference. It may not be a linear relationship and must be determined based on specific measurements.

[0050] In the present invention, the schematic diagram of cutting the first roller ring 1 and the second roller ring 2 is as shown in Figure 3 As shown, the left vertex of the first roller ring 1 of the straightening roller No. P is recorded as point a, the point on the right side of the second roller ring 2 at a distance h from the vertex is recorded as point b, and the two points ab are connected to form a virtual cutting line; and under the condition of rotation, the first roller ring 1 and the second roller ring 2 of the straightening roller No. P are cut along the virtual cutting line, and the part outside the virtual cutting line is removed (that is, the first roller ring 1 and the second roller ring 2 are cut one circle).

[0051] In the present invention, only the first roller ring 1 and the second roller ring 2 need to be cut, and the remaining parts do not need to be cut.

[0052] In a specific embodiment, the connection between the circumferential outer side surface of the first roller ring 1 and the second roller ring 2 of the present invention and the end side surface (left side surface, right side surface) is a chamfered structure. At this time, the connection point between the chamfered structure between the left side surface of the first roller ring 1 and the circumferential outer side surface and the circumferential outer side surface is the vertex, that is, point a; the point on the right side surface of the second roller ring 2 that is at a height difference h from the circumferential outer side surface is point b, such as Figure 3 shown.

[0053] Since the height difference h is usually small, the height difference h will not be greater than half of the difference between the outer diameter and the inner diameter of the second roller ring 2 (ie, the shaft hole of the roller ring will not be cut).

[0054] In the present invention, since one of the first roller ring 1 and the second roller ring 2 will be tilted up and the other will be pressed down when straightening the steel, the pressure applied by the tilted roller ring is smaller than the pressure applied by the pressed roller ring, resulting in excessive pressure from the pressed roller ring and causing cracks. Therefore, the roller ring closer to the arch, i.e., the second roller ring 2, will be cut a little more to avoid cracks caused by the large force on the steel on the pressed side.

[0055] In order to compensate for this pressure difference, the roller surface needs to be cut into an inclined surface. Therefore, the purpose of cutting the first roller ring 1 and the second roller ring 2 is to make the roller surface into an inclined surface, which can make the force on the rolled piece more uniform, avoid the side that is pressed down being subjected to greater force and causing cracks, and effectively avoid straightening cracks.

[0056] The present invention will be described in detail below through examples.

[0057] The horizontal roller straightening machine used below is composed of two rows of staggered straightening rollers, and its working diagram is as follows: Figure 1 As shown, the horizontal roller straightening machine includes 8 straightening rollers, wherein the straightening rollers numbered 2, 4, 6 and 8 along the straightening direction of the horizontal roller straightening machine (i.e., the 2nd, 4th, 6th and 8th straightening rollers along the straightening direction of the horizontal roller straightening machine) are upper straightening rollers, and the straightening rollers numbered 1, 3, 5 and 7 (i.e., the 1st, 3rd, 5th and 7th straightening rollers along the straightening direction of the horizontal roller straightening machine) are lower straightening rollers;

[0058] Each straightening roller comprises a first roller ring 1 and a second roller ring 2, and a plurality of gaskets are arranged between the first roller ring 1 and the second roller ring 2;

[0059] The first roller ring 1 and the second roller ring 2 are both fixedly connected to the shaft sleeve and are both located at one end of the roller shaft;

[0060] The first roller ring 1 is a roller ring far away from the arch of the horizontal roller straightening machine, and the second roller ring 2 is a roller ring close to the arch of the horizontal roller straightening machine;

[0061] The first roller ring 1 and the second roller ring 2 are both circular ring structures; the first roller ring 1 and the second roller ring 2 are of the same size, the outer diameter of the first roller ring 1 and the second roller ring 2 are both 1020 mm, and the inner diameter is both 600 mm; the thickness of the first roller ring 1 and the second roller ring 2 is both 100 mm; the distance between the first roller ring 1 and the second roller ring 2 is both 171 mm;

[0062] The connection between the circumferential outer side surface of the first roller ring 1 and the second roller ring 2 and the end side surface (left side surface and right side surface) is a chamfered structure.

[0063] Example 1

[0064] The method for configuring the roller rings of the straightening rollers No. 2, 4 and 6 includes the following steps:

[0065] S1. Use a horizontal roller straightening machine to straighten a piece of steel (H400*200 steel) at a set reduction (18mm). Stop the horizontal roller straightening machine after the steel passes through the No. 8 straightening roller. Use a level meter and a feeler gauge to measure the height difference h between the first roller ring 1 and the second roller ring 2 of the No. 2, 4 and 6 straightening rollers respectively; Figure 2 As shown; the height differences h of straightening rollers No. 2, 4 and 6 are shown in Table 1;

[0066] S2, respectively, the connection point between the chamfer structure between the left side surface and the outer side surface of the circumference of the first roller ring 1 of each of the straightening rollers No. 2, 4 and 6 and the outer side surface of the circumference is marked as point a, and the point on the right side surface of the second roller ring 2 with a height difference h from the outer side surface of the circumference is marked as point b, and the two points ab are connected to form a virtual cutting line;

[0067] S3. Under the condition of rotation, cut the first roller ring 1 and the second roller ring 2 of the No. 2, 4 and 6 straightening rollers along their respective virtual cutting lines (cut the first roller ring 1 and the second roller ring 2 once), and remove the parts outside the virtual cutting line, such as Figure 3 As shown; the first roller ring 1 and the second roller ring 2 of the straightening rollers No. 2, 4 and 6 after cutting are as shown Figures 4 to 6 As shown ( Figure 4 This is the first roller ring 1 and the second roller ring 2 of the No. 2 straightening roller after cutting. Figure 5 This is the first roller ring 1 and the second roller ring 2 of the No. 4 straightening roller after cutting. Figure 6 The first roller ring 1 and the second roller ring 2 of the No. 6 straightening roller are cut.

[0068] The horizontal roller straightening machine was used to straighten steel (H400*200 steel) after cutting the first roller ring 1 and the second roller ring 2 of the straightening rollers No. 2, 4 and 6. In August 2023, more than 1,500 tons of H400*200 steel were straightened without any cracking, and the crack correction rate was 0; crack correction rate = crack correction tonnage / total straightening tonnage*100%.

[0069] Table 1

[0070] Straightening Roller No. 2 No. 4 No. 6 Height difference 1.2mm 0.7mm 0.5mm

[0071] Comparative Example 1

[0072] Use an uncut horizontal roller straightening machine to straighten the steel (H400*200 steel). The straightening operation is the same as in Example 1. From July 4 to 9, 2023, a total of more than 2,116 tons of H400*200 steel were straightened, of which about 12 tons were cracked. The crack straightening rate of this batch of H400*200 steel was 0.57%, and the crack straightening rate = crack straightening tonnage / total straightening tonnage*100%.

[0073] According to the above results, the present invention effectively controls the post-correction cracks of H400*200 steel in production by redesigning the roller surface, and no post-correction cracks are found after the improvement.

[0074] It should be understood that parts not elaborated in detail in this specification belong to the prior art.

[0075] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A roller ring configuration method for a horizontal roller straightening machine for controlling H-beam straightening cracks, the horizontal roller straightening machine comprising a plurality of lower straightening rollers and an upper straightening roller arranged along a straightening direction, the lower straightening rollers and the upper straightening rollers each comprising a first roller ring (1) and a second roller ring (2), the first roller ring (1) and the second roller ring (2) both being arranged on a roller shaft, and a plurality of gaskets being arranged between the first roller ring (1) and the second roller ring (2), characterized in that: The method for configuring the roller ring of the P-number straightening roller includes the following steps: S1, detecting the height difference h between the first roller ring (1) and the second roller ring (2) of the straightening roller No. P at a set pressing amount; S2, the vertex on the left side of the first roller circle (1) of the straightening roller No. P is recorded as point a, the point on the right side of the second roller circle (2) at a distance h from the outer side of the circumference is recorded as point b, and the two points ab are connected to form a virtual cutting line; S3, cutting the first roller ring (1) and the second roller ring (2) of the straightening roller No. P along the virtual cutting line under the condition of rotation; Among them, the P-numbered straightening roller is the P-th straightening roller along the straightening direction of the horizontal roller straightening machine, and P is a natural number greater than 0.

2. The roller ring configuration method according to claim 1, characterized in that: P=2n, 1≤n≤3, and n is an integer.

3. The roller ring configuration method according to claim 1 or 2, characterized in that: The first roller ring (1) and the second roller ring (2) are both located at one end of the roller shaft.

4. The roller ring configuration method according to claim 3, characterized in that: The first roller ring (1) is a roller ring far away from the arch of the horizontal roller straightening machine, and the second roller ring (2) is a roller ring close to the arch of the horizontal roller straightening machine.

5. The roller ring configuration method according to claim 1, characterized in that: The first roller ring (1) and the second roller ring (2) are both circular ring structures.

6. The roller ring configuration method according to claim 5, characterized in that: The outer diameters of the first roller ring (1) and the second roller ring (2) are both 860 mm to 1100 mm, and the inner diameters are both 599 mm to 601 mm.

7. The roller ring configuration method according to claim 1 or 6, characterized in that: The thickness of the first roller ring (1) and the second roller ring (2) are both 99.5 to 100.5 mm.

8. The roller configuration method according to claim 1, characterized in that: The distance between the first roller ring (1) and the second roller ring (2) is 170-172 mm.

9. The roller ring configuration method according to claim 1, characterized in that: In step S1, the set pressing amount is 5 to 20 mm.

10. The roller ring configuration method according to claim 1 or 9, characterized in that: In step S1, a level meter and a feeler gauge are used to detect a height difference h between the first roller ring (1) and the second roller ring (2) of the P-number straightening roller.

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