A pass system for producing an L-shaped steel and a rolling method of the L-shaped steel

Abstract

This application provides a roll pass system and a rolling method for L-shaped steel. The roll pass system first rolls H-beam billets into channel-shaped intermediate billets, and then further rolls these intermediate billets into L-shaped steel. The roll pass system for rolling the channel-shaped intermediate billets into L-shaped steel can utilize conventional rectangular billet billets, thus reusing existing roll pass systems. This simplifies the roll pass system for rolling H-beam billets into L-shaped steel, enriches the production path for L-shaped steel, and helps alleviate the shortage of rectangular billet billet supply.

Description

Technical Field

[0001] This application relates to the field of section steel rolling, and more specifically, to a die system for producing L-shaped steel and a rolling method for L-shaped steel. Background Technology

[0002] L-shaped steel, also known as angle steel, square steel, or unequal angle steel, is an indispensable structural material in shipbuilding, marine engineering, bridge construction, and other fields. It is mainly used as a reinforcing rib for bulkheads, decks, and other plate structures. The cross-section of L-shaped steel is an asymmetrical "L" shape, consisting of a thicker vertical panel and a thinner horizontal web, making it a typical irregularly shaped steel section. Its asymmetrical cross-sectional characteristics lead to severe uneven deformation during rolling, making the rolled piece prone to lateral bending and torsion, resulting in high rolling difficulty and extremely high requirements for the stability of the roll pass design.

[0003] Conventional L-shaped steel production processes often use rectangular billets as raw materials. For example, patent application CN1593798A discloses a method for rolling angle steel, in which a smaller rectangular billet is rolled through several "W"-shaped holes, and then through "W"-shaped recovery holes, the two sides of the "W"-shaped billet are gradually rolled into the arc-shaped section and horizontal section of the butterfly hole. Then, it is fed into the butterfly hole of the angle steel rolling mill to roll out larger-sized angle steel.

[0004] In actual production, due to resource allocation and other reasons, there may be a shortage of rectangular billets. Summary of the Invention

[0005] This application provides a die-rolling system for producing L-shaped steel and a rolling method for L-shaped steel, which enables the production of L-shaped steel using non-shaped billet raw materials.

[0006] To address the aforementioned technical problems, the embodiments of this application provide the following technical solutions: In a first aspect, a die-cutting system for producing L-shaped steel is provided, which is applied to H-shaped billet raw material. The die-cutting system includes: a first set of die-cuttings for rolling the H-shaped billet raw material into a grooved intermediate billet; and a second set of die-cuttings for rolling the grooved intermediate billet into the L-shaped steel.

[0007] This technical solution utilizes both the first and second sets of pass patterns to roll H-beams into L-beams, improving the flexibility of L-beam production organization and effectively addressing situations where rectangular billets are insufficient in supply. The second set of pass patterns can be some of the pass patterns used in the rolling process of L-beams from rectangular billets. Thus, this technical solution allows for the reuse of existing pass pattern systems, achieving partial pass pattern compatibility and ensuring continuous production.

[0008] In conjunction with the first aspect, in some implementations of the first aspect, the first set of pass patterns includes: a first pass pattern for reducing the height of the H-shaped billet raw material; a second pass pattern for flattening the flanges of the H-shaped billet raw material; and a third pass pattern for reducing the dimensions of the left leg, right leg, and waist of the intermediate billet corresponding to the H-shaped billet raw material.

[0009] Understandably, the second pass can be used to roll the flanges on both sides of the H-beam billet raw material.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the second pass corresponds to two rolling passes, wherein the distance between the bottom of the groove of the upper roll and the boss of the lower roll included in the second pass is different in the two rolling passes.

[0011] Rolling in two passes allows the metal at the upper flange of the H-bill to flow slowly and smoothly into the rolled piece, preventing metal overlap or folding defects that might occur with a large reduction in a single pass. Furthermore, compared to using multiple different pass profiles to achieve the same purpose, using the same pass profile in multiple passes simplifies the pass system, reduces its cost, and improves production efficiency.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the third hole type includes a first sub-hole type and a second sub-hole type, the second sub-hole type being used to control the length of the left leg and the right leg of the intermediate billet.

[0013] In one possible implementation, the first and second sub-passes can correspond to two rolling passes. Compared to single-pass rolling, a two-pass rolling setup is more conducive to ensuring the metal fills the die system to meet design requirements, avoiding potential problems such as dimensional inaccuracies and numerous microscopic defects in the finished product. Compared to three or more passes, a two-pass setup helps reduce roll costs.

[0014] In conjunction with the first aspect, in some implementations of the first aspect, the first hole type is a box-shaped hole type, the height of the first hole type is A1, the bottom width of the groove is B1, (A-b0)-15mm≤A1≤(A-b0)+15mm; 0.5×B0-5mm≤B1≤0.5×B0+5mm; where A is the length of the web of the L-shaped steel, b0 is the flange height of the H-shaped billet raw material, and B0 is the width of the H-shaped billet raw material.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, the groove bottom width of the upper roll of the second die is A2, the boss width of the lower roll is C2, the boss height of the lower roll is D2, (A1-30)-10mm≤A2≤(A1-30)+10mm; (A1- t0)-5mm≤C2≤(A1- t0)+5mm; b0-10mm≤D2≤b0+10mm.

[0016] In conjunction with the first aspect, in some implementations of the first aspect, the distance between the first side of the bottom of the groove of the upper roll of the first sub-gap type and the boss of the lower roll is h5, h3-5mm≤h5≤h3+5mm; wherein, h3 is the distance between the first side of the bottom of the groove of the upper roll of the second gap type and the boss of the lower roll.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the distance between the first side of the groove bottom of the upper roll of the second sub-groove and the boss of the lower roll is h6, (h5-6)mm≤h6≤(h5-3)mm.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, different regions on the second side of the groove bottom of the upper roll of the first sub-drill are spaced at the same distance from the boss of the lower roll, and different regions on the second side of the groove bottom of the upper roll of the second sub-drill are spaced at the same distance from the boss of the lower roll, wherein the first side is different from the second side.

[0019] In conjunction with the first aspect, in some implementations of the first aspect, the slope of the sidewall of the first aperture is 10° to 15°.

[0020] In conjunction with the first aspect, in some implementations of the first aspect, the slope of the upper left sidewall of the second hole is φ2, the slope of the lower left sidewall is φ3, the slope of the upper right sidewall is φ4, and the slope of the lower right sidewall is φ5; 7°≤φ2≤17°; 23°≤φ3≤33°; 7°≤φ4≤17°; 33°≤φ5≤43°.

[0021] In conjunction with the first aspect, in some implementations of the first aspect, the slope of the upper left sidewall of the first sub-hole is φ6, the slope of the lower left sidewall is φ7, the slope of the upper right sidewall is φ8, and the slope of the lower right sidewall is φ9; 10°≤φ6≤20°; 25°≤φ7≤35°; 15°≤φ8≤25°; 25°≤φ9≤35°.

[0022] In conjunction with the first aspect, in some implementations of the first aspect, the slope of the upper left sidewall of the second sub-hole is φ. 10 The slope of the lower left side wall is φ. 11 The slope of the upper right side wall is φ. 12 The slope of the lower right side wall is φ. 13 ; 14°≤φ 10 ≤24°; 29°≤φ 11 ≤39°; 19°≤φ 12 ≤29°; 19°≤φ 13 ≤29°.

[0023] In a second aspect, a rolling method for L-shaped steel is provided, applied to H-shaped billet raw material. The method includes: rolling the H-shaped billet raw material into a grooved intermediate billet using a first set of pass patterns in the pass pattern system of the first aspect and any possible implementation thereof; and rolling the grooved intermediate billet into the L-shaped steel using a second set of pass patterns in the pass pattern system of the first aspect and any possible implementation thereof.

[0024] This technical solution utilizes a first set of pass patterns and a second set of pass patterns to roll H-beams into L-beams, improving the flexibility of L-beam production organization and effectively addressing situations where rectangular billets are insufficient in supply. The second set of pass patterns can be some of the pass patterns used in the rolling process of L-beams from rectangular billets. Thus, this technical solution allows for the reuse of existing pass pattern systems, achieving partial pass pattern compatibility and ensuring continuous production.

[0025] In conjunction with the second aspect, in some implementations of the second aspect, rolling the H-shaped billet raw material into a grooved intermediate billet includes: sequentially rolling the H-shaped billet raw material using the first pass, the second pass and the third pass included in the first set of passes, and rolling the H-shaped billet raw material two times using the second pass.

[0026] Rolling in two passes allows the metal at the upper flange of the H-bill to flow slowly and smoothly into the rolled piece, preventing metal overlap or folding defects that might occur with a large reduction in a single pass. Furthermore, compared to using multiple different pass profiles to achieve the same purpose, using the same pass profile in multiple passes simplifies the pass system, reduces its cost, and improves production efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 The image shown is a schematic diagram of the cross-section of an L-shaped steel provided in an embodiment of this application.

[0029] Figure 2 The diagram shown is a schematic diagram of a rectangular billet raw material provided in an embodiment of this application.

[0030] Figure 3 The image shown is a hole-type system provided in an embodiment of this application.

[0031] Figure 4The image shows an H-shaped billet raw material provided in an embodiment of this application.

[0032] Figure 5 The image shown is another hole type system provided in an embodiment of this application.

[0033] Figures 6 to 10 As shown Figure 5 The hole pattern system shown includes a variety of hole patterns.

[0034] Figure 11 The figure shows a rolling method for L-shaped steel provided in an embodiment of this application.

[0035] Figure 12 The image shows another H-shaped billet raw material provided in an embodiment of this application.

[0036] Figures 13 to 17 As shown Figure 5 The hole pattern system shown includes a variety of hole patterns.

[0037] Figure 18 As shown Figure 5 The hole system shown includes various hole sizes.

[0038] Explanation of reference numerals in the attached figures: L-shaped steel 10, face plate 11, web plate 12, rectangular billet raw material 20, die system 30, H-shaped billet raw material 40, flange 41, flange 42, die system 50, H-shaped billet raw material 401, die 501, die 502, die 503, die 504. Detailed Implementation

[0039] The embodiments of this application are described in detail below, and examples of these embodiments are illustrated in the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0040] like Figure 1 The diagram shown is a schematic cross-section of an L-shaped steel 10 provided in an embodiment of this application.

[0041] L-shaped steel may include a face plate 11 and a web plate 12. The plane containing the face plate 11 may be perpendicular to the plane containing the web plate 12. The thickness t1 of the face plate 11 may be relatively thick, and the thickness t2 of the web plate 12 may be relatively thin, that is, t1 may be greater than t2. The length A of the web plate 12 may be relatively long, and the length B of the face plate 11 may be relatively short, that is, A may be greater than B.

[0042] Figure 2The diagram shown is a schematic diagram of a rectangular billet raw material 20 for rolling L-shaped steel 10 according to an embodiment of this application. The length of the rectangular billet raw material 20 can be C and the width can be D.

[0043] Figure 3 The image shows a die system 30 provided in an embodiment of this application. The die system 30 can be used to roll rectangular billet raw material 20 into L-shaped steel 10.

[0044] The die system in this application refers to a complete rolling channel system consisting of a series of rolling grooves (die types) arranged in a specific order and whose shapes and sizes are mutually matched. It is a key process design for realizing the gradual shape change of metal from billet (such as square billet, rectangular billet) to final product (such as round steel, angle steel, I-beam).

[0045] The die system 30 may include die types K1 to K9, all of which can be used in the rolling process of L-shaped steel 10.

[0046] Among them, the K9 to K7 pass types can be used to roll rectangular billet raw material 20 into a groove shape. These three pass types can correspond to the three passes of the groove rolling process, respectively.

[0047] The K9 pass can be used as a cutting pass. During the rolling process of the rectangular billet 20 using the K9 pass, the lower roll boss and the upper roll groove corresponding to the K9 pass cut the rectangular billet 20. Under the combined action of the upper and lower rolls, the centripetal part of the rectangular billet 20 undergoes a violent displacement.

[0048] Both the K8 and K7 die types can be designed with an open shape, and both are used to adjust the shape of the intermediate billet after passing through the K9 die type.

[0049] After rolling through the K9 to K7 passes, the intermediate billet can enter the K6 to K4 passes for rolling. These three passes can each correspond to three processing passes and can be used to roll the cross-sectional shape of the intermediate billet into a shape close to that of the finished L-shaped steel 10.

[0050] Among them, the K6 pass can be a closed pass for rolling and controlling the ends of the metal. The K5 pass can be a slotted pass similar to the K6 pass and is used to control the uniform deformation of the metal. The K4 pass can serve as the inlet pass for the K3 pass and is used to further adjust the shape and size of the rolled material.

[0051] After rolling through passes K6 to K4, the cross-sectional shape of the intermediate billet is close to that of the finished product, and the intermediate billet then enters the finishing rolling pass. The finishing rolling pass can be achieved using passes K3, K2, and K1. These three passes each correspond to three processing passes.

[0052] The waist and right leg lengths of the K3 pass are further increased. After rolling through the K3 pass, the billet enters the K2 pass. The K2 pass allows for a redistribution of the right leg and waist dimensions, while also flattening the left leg. This ensures that after the intermediate billet enters the finishing K1 pass, the left leg is fully filled in the cavity, meeting the finished product dimensions. The K1 pass, as the final finishing pass, can adopt a fully closed design to ensure that the shape and dimensions of the finished product's cross-section meet design requirements.

[0053] In general, K9 to K7 passes are used for slotted rolling, all three having asymmetrical slot shapes to progressively roll out the two legs of the L-shaped steel. K6 to K1 passes can also use slotted rolling. The K6 pass is used to flatten the upper right flange of the intermediate billet rolled by the conventional slotted K7 pass, while increasing the waist length of the intermediate billet and controlling the thickness of the two legs. K5, K4, and K3 passes, through an alternating upper and lower locking design, further increase the waist size of the intermediate billet, increase the right leg length, and decrease the thickness of the two legs. In the K2 pass, the left leg of the intermediate billet is flattened to avoid the problem of insufficient leg filling caused by directly flattening the intermediate billet during the K1 pass rolling process. In the K1 pass, the leg thickness of the intermediate billet is precisely rolled until it is straightened, so that the shape and size of the finished product meet the design requirements of L-shaped steel 10.

[0054] Figure 4 The image shows an H-shaped billet raw material 40 for rolling L-shaped steel 10 according to an embodiment of this application. The length of the H-shaped billet raw material 40 can be A0, the width can be B0, the flange height can be b0, and the flange width can be t0.

[0055] If the roll pass system for rolling L-shaped steel is used directly to roll H-shaped billet 40, the protruding flange on the top of H-shaped billet 40 will cause serious folding defects, and the size of H-shaped billet 40 may be too large, thus it cannot directly enter the rolling pass.

[0056] Figure 5 The image shows a die system 50 provided in an embodiment of this application. The die system 50 can be used to roll H-beam billet 40 into L-beam steel 10.

[0057] The die system 50 may include a first set of die patterns and a second set of die patterns. The first set of die patterns can be used to roll H-beam billet 40 into a channel-shaped intermediate billet, and the second set of die patterns can be used to roll the channel-shaped intermediate billet into an L-shaped steel 10.

[0058] In one possible example, the second set of hole types may include hole types K6 to K1. For a related introduction to hole types K6 to K1, please refer to the content above.

[0059] The second set of roll pass patterns in roll pass system 50 reuses some roll pass patterns for rolling L-shaped steel from conventional rectangular billet raw materials, achieving compatibility with existing roll pass systems. This enriches the manufacturing process of L-shaped steel while simplifying the L-shaped steel production line and ensuring the continuity of L-shaped steel production.

[0060] In some examples, the first set of pass patterns may include a first pass pattern that can be used to reduce the height of the H-bill raw material and control the cross-sectional dimensions of the intermediate billet so that the H-bill raw material 40 after being rolled by the first pass pattern can meet the requirements of subsequent rolling.

[0061] For example, the first hole type can be a box-shaped hole type.

[0062] like Figure 6 The K24 hole pattern shown can be used as an example of the first hole pattern mentioned above.

[0063] The height of the K24 die can be A1, and the value of height A1 can be related to the length A of the web 12 of the L-shaped steel and the flange height b0 of the H-shaped billet raw material 40.

[0064] For example, A1 = (A - b0) ± 15mm. That is: (A - b0) - 15mm ≤ A1 ≤ (A - b0) + 15mm. In this way, the first die can compress the height of the H-shaped billet 40 from A0 to A1.

[0065] The bottom width B1 of the K24 hole type can be related to the width B0 of the H-shaped billet raw material 40.

[0066] For example, B1 = 0.5 × B0 ± 5 mm. That is: 0.5 × B0 - 5 mm ≤ B1 ≤ 0.5 × B0 + 5 mm.

[0067] The sidewall slope φ1 of the K24 hole type can be 10°~15°, for example, 11°, 12°, 13°, 14°, etc.

[0068] In some examples, the first set of pass patterns may include a second pass pattern, which can be used to roll the flanges of the H-beam billet 40, for example... Figure 4 The first flange 41 and the second flange 42.

[0069] For example, the second pass can correspond to two rolling passes, and the distance between the bottom of the upper roll groove and the lower roll boss in these two passes can be different, so as to roll the flange of the H-shaped billet 40 to different heights successively.

[0070] Rolling in two passes allows the metal at the upper flange of the H-bill raw material 40 to flow slowly and smoothly into the rolled piece, preventing metal overlap or folding defects that may be caused by a large reduction in a single pass.

[0071] like Figure 7 and Figure 8 The K23 hole pattern shown can be used as an example of the second hole pattern mentioned above.

[0072] The slope of the sidewalls of the K23 die can be within a certain angle range to prevent the intermediate billet from twisting and / or shrinking during rolling, and to reduce the axial force of the rolls during rolling.

[0073] For example, such as Figure 7 or Figure 8 As shown, the slope of the upper left side wall of the K23 die (or the slope of the left side wall of the upper roll groove) is φ2, and the slope of the lower left side wall of the K23 die (or the slope of the left side wall of the lower roll groove) is φ3.

[0074] φ2 = 12° ± 5°, that is: 7° ≤ φ2 ≤ 17°, for example, φ2 = 9°, 11°, 13°, 15°, etc.

[0075] φ3 = 28° ± 5°, that is: 23° ≤ φ3 ≤ 33°, for example, φ3 = 25°, 27°, 29°, 31°, etc.

[0076] For example, such as Figure 7 or Figure 8 As shown, the slope of the upper right side wall of the K23 die (or the slope of the right side wall of the upper roll groove) is φ4, and the slope of the lower left side wall of the K23 die (or the slope of the right side wall of the lower roll groove) is φ5.

[0077] φ4 = 12° ± 5°, that is: 7° ≤ φ4 ≤ 17°, for example, φ4 = 9°, 11°, 13°, 15°, etc.

[0078] φ5 = 38° ± 5°, that is: 33° ≤ φ5 ≤ 43°, for example, φ5 = 35°, 37°, 39°, 41°, etc.

[0079] The groove bottom width of the upper roll of the K23 die can be related to the height A1 of the first die. For example, the groove bottom width of the upper roll of the K23 die can be A2, A2=(A1-30)±10mm, that is: (A1-30)-10mm≤A2≤(A1-30)+10mm.

[0080] The boss width C2 of the lower roll of the K23 pass can be related to the height A1 of the first pass and the flange width t0 of the H-shaped billet 40. For example, C2 = (A1 - t0) ± 5mm, that is: (A1 - t0) - 5mm ≤ C2 ≤ (A1 - t0) + 5mm.

[0081] The boss height D2 of the lower roll of the K23 die can be related to the flange height b0 of the H-bill raw material 40. For example, D2 = b0 ± 10 mm, that is: b0 - 10 mm ≤ D2 ≤ b0 + 10 mm.

[0082] The distance between the first side of the groove bottom of the upper roll and the boss of the lower roll in the K23 die type can be different from the distance between the second side of the groove bottom of the upper roll and the boss of the lower roll.

[0083] The first side and the second side are different. For example, the first side can be the left side and the second side can be the right side. Alternatively, the first side can be the right side and the second side can be the left side. This application embodiment will be described using the former case as an example. That is, the distance between the left side of the groove bottom of the upper roll of the K23 type and the lower roll boss can be different from the distance between the right side of the groove bottom of the upper roll and the lower roll boss.

[0084] For example, such as Figure 7 As shown, in the first pass of rolling with K23 groove, the distance between the left side of the groove bottom of the upper roll and the boss of the lower roll can be h1, and the distance between the right side of the groove bottom of the upper roll and the boss of the lower roll can be h2, where h1≠h2. Figure 7 In this example, h1 is greater than h2; in other examples, h1 can also be less than h2.

[0085] For example, such as Figure 8 As shown, in the second pass of rolling with K23 groove, the distance between the left side of the groove bottom of the upper roll and the boss of the lower roll can be h3, and the distance between the right side of the groove bottom of the upper roll and the boss of the lower roll can be h4, where h3≠h4. Figure 8 In this example, h3 is greater than h4; in other examples, h3 can also be less than h4.

[0086] The distance between the left side of the groove bottom of the upper roll and the boss of the lower roll in the K23 pass pattern, and the distance between the right side of the groove bottom of the upper roll and the boss of the lower roll, can be designed according to the reduction dimension of the flange of the H-shaped billet 40 in the pass.

[0087] For example, after the first pass of rolling in the K23 pass, the height of the left flange of the H-beam billet 40 is rolled to 30% ± 3% of the initial height b0, and the height of the right flange is rolled to 25% ± 3% of the initial height b0.

[0088] After the second pass of rolling in the K23 pass, the height of the left flange of the H-bill raw material 40 is rolled to 60% ± 5% of the initial height b0, and the height of the right flange is rolled to 40% ± 5% of the initial height b0.

[0089] In the example above, h1 can be greater than h3, and h2 can be greater than h4.

[0090] Understandably, the greater the reduction ratio of the flange height of the H-bill raw material 40 in a given pass, the smaller the distance between the bottom of the upper roll groove and the boss of the lower roll in the K23 pass can be. For example, in the first pass rolling process, the greater the reduction ratio of the flange height of the H-bill raw material 40, the smaller the aforementioned heights h1 and h2. Similarly, in the second pass rolling process, the greater the reduction ratio of the flange height of the H-bill raw material 40, the smaller the values ​​of heights h3 and h4.

[0091] Understandably, in some other examples, the effect of two-pass rolling with the same pass pattern can also be achieved by rolling with multiple different passes. However, compared to the latter method, the method of rolling with the same pass pattern in multiple passes is beneficial to simplify the pass pattern system, reduce the cost of the pass pattern system, and improve production efficiency.

[0092] In some examples, the first set of passes may include one or more third passes that can be used to further process the intermediate billet rolled by the second pass, so that the intermediate billet rolled by the third pass can be further rolled using the second set of passes mentioned above.

[0093] In some scenarios, the third hole type can also be called the transition hole type.

[0094] For example, the third pass may include a first sub-pass and a second sub-pass. The first sub-pass may be an open design, which can be used to receive the intermediate billet from the second pass and to reduce the dimensions of the left leg, right leg, and waist of the intermediate billet, so that the intermediate billet rolled by the first sub-pass can meet the requirements of the subsequent rolling by the second sub-pass. The second sub-pass may be a control hole and is used to control the length of the ends of the two legs of the intermediate billet.

[0095] In one possible example, during the rolling process using the first sub-pass, the strain of the intermediate billet can be concentrated at the left and right leg ends.

[0096] For example, such as Figure 9 The K22 hole pattern shown can be used as an example of the first sub-hole pattern mentioned above.

[0097] The slope of the upper left side wall of the K22 pass (or the slope of the left side wall of the upper roll groove) is φ6, and the slope of the lower left side wall of the K22 pass (or the slope of the left side wall of the lower roll groove) is φ7.

[0098] φ6 = 15° ± 5°, that is: 10° ≤ φ6 ≤ 20°, for example, φ6 = 12°, 14°, 16°, 18°, etc.

[0099] φ7 = 30° ± 5°, that is: 25° ≤ φ7 ≤ 35°, for example, φ7 = 27°, 29°, 31°, 33°, etc.

[0100] The slope of the upper right side wall of the K22 pass (or the slope of the right side wall of the slot of the upper roll) is φ8, and the slope of the lower right side wall of the K22 pass (or the slope of the right side wall of the slot of the lower roll) is φ9.

[0101] φ8 = 20° ± 5°, that is: 15° ≤ φ8 ≤ 25°, for example, φ8 = 17°, 19°, 21°, 23°, etc.

[0102] φ9 = 30° ± 5°, that is: 25° ≤ φ9 ≤ 35°, for example, φ9 = 27°, 29°, 31°, 33°, etc.

[0103] The distance between the left side of the bottom of the slot of the upper roll in the K22 pass and the boss of the lower roll can be h5. The value of h5 can be related to the distance between the left side of the bottom of the slot of the upper roll in the second pass and the boss of the lower roll. For example, h5 = h3 ± 5mm, that is: h3 - 5mm ≤ h5 ≤ h3 + 5mm. In this way, after rolling in the K22 pass, the distance between the left flange of the intermediate billet (corresponding to the left side of the slot of the upper roll in the K22 pass) and the boss of the lower roll can be h5.

[0104] The distance from different areas on the right side of the bottom of the upper roll groove of the K22 die to the boss of the lower roll can be approximately equal. In this way, after rolling through the K22 die, the right flange of the intermediate billet can be flattened.

[0105] In one possible example, during rolling using the second sub-pass, the strain of the intermediate billet is mainly distributed at the inner corners of the two legs and on the surface in contact with the rolls. The filling degree of the intermediate billet in the second sub-pass can be relatively high; for example, the intermediate billet can be overfilled on the right side of the second sub-pass.

[0106] For example, such as Figure 10 The K21 hole pattern shown can be used as an example of the second sub-hole pattern mentioned above.

[0107] The slope of the upper left side wall of the K21 pass (or the slope of the left side wall of the upper roll slot) is φ. 10 The slope of the lower left side wall of the K21 pass (or the slope of the left side wall of the lower roll slot) is φ. 11 .

[0108] φ 10 =19°±5°, that is: 14°≤φ 10 ≤24°, for example, φ 10 =16°, 18°, 20°, 22°, etc.

[0109] φ 11 =34°±5°, that is: 29°≤φ 11≤39°, for example, φ 11 =31°, 33°, 35°, 37°, etc.

[0110] The slope of the upper right side wall of the K21 pass (or the slope of the right side wall of the upper roll slot) is φ. 12 The slope of the lower right side wall of the K21 pass (or the slope of the right side wall of the lower roll slot) is φ. 13 .

[0111] φ 12 =24°±5°, that is: 19°≤φ 12 ≤29°, for example, φ 12 =21°, 23°, 25°, 27°, etc.

[0112] φ 13 =24°±5°, that is: 19°≤φ 13 ≤29°, for example, φ 13 =21°, 23°, 25°, 27°, etc.

[0113] The distance between the left side of the bottom of the slot of the upper roll in the K21 pass and the boss of the lower roll can be h6. The value of h6 can be related to the distance between the left side of the bottom of the slot of the upper roll in the K22 pass and the boss of the lower roll. For example, the value of h6 can be (h5-6)mm≤h6≤(h5-3)mm. In this way, after rolling in the K21 pass, the distance between the left flange of the intermediate billet (corresponding to the left side of the slot of the upper roll in the K21 pass) and the boss of the lower roll can be h6.

[0114] The distance from different areas of the bottom of the groove on the right side of the upper roll of the K21 die to the boss of the lower roll can be approximately equal. In this way, after rolling through the K21 die, the right flange of the intermediate billet can remain flat.

[0115] In one possible example, the length of the centerline of the left leg, the length of the centerline of the waist, and the length of the centerline of the right leg of the third hole type (including the first and second sub-hole types mentioned above) can conform to the design specifications for the centerline length of conventional slot holes.

[0116] In some other examples, the third pass can correspond to one or three or more passes. In the example above, the third pass includes the first and second sub-passes, corresponding to two passes. Compared to one pass, setting two passes is more conducive to ensuring the metal fills the die system to meet design requirements, avoiding potential problems such as dimensional inaccuracies and numerous microscopic defects in the finished product. Compared to three or more passes, setting two passes helps reduce roll costs.

[0117] After rolling through the third pass, the cross-sectional shape of the intermediate billet can meet the requirements for smoothly entering the first set of passes for rolling.

[0118] like Figure 11 The illustration shows a rolling method for L-shaped steel provided in this application embodiment. This method is applicable to the rolling process of H-shaped billet raw materials.

[0119] S1, using the first set of pass rolls to roll the H-shaped billet raw material to obtain the intermediate billet.

[0120] For example, the first set of die patterns can be used to roll H-shaped billet raw material into a grooved intermediate billet.

[0121] The first set of pass patterns may include a first pass pattern, a second pass pattern, and a third pass pattern. The first pass pattern can be used to reduce the height of the H-beam billet raw material and control the cross-sectional dimensions of the intermediate billet. The second pass pattern can be used to flatten the flanges of the H-beam billet raw material. The third pass pattern can be used to further process the rolled piece obtained by the second pass pattern so that the rolled piece obtained by the third pass pattern can be further rolled by the second set of pass patterns.

[0122] The K24 hole type mentioned above can be used as an example of the first hole type, the K23 hole type mentioned above can be used as an example of the second hole type, and the K22 and K21 hole types mentioned above can be used as examples of the third hole type.

[0123] For more information about the first, second, and third hole types, please refer to the descriptions above.

[0124] In one possible example, the H-beam billet can first be rolled through the K24 pass, then rolled through the K23 pass in two passes, and then rolled through the K22 and K21 passes in sequence, to obtain an intermediate billet that can be used for further rolling in the second set of passes.

[0125] S2, using the second set of roll passes to roll the intermediate billet to obtain L-shaped steel.

[0126] For example, the second set of die patterns can be used to roll a channel-shaped intermediate billet into an L-shaped steel.

[0127] As an example, the second group of hole types may include hole types K6 to K1. For a related introduction to hole types K6 to K1, please refer to the description above.

[0128] like Figure 12 The diagram shown is a schematic representation of the shape and dimensions of an H-shaped billet raw material 401 provided in an embodiment of this application. This H-shaped billet raw material 401 can be used as an example of the aforementioned H-shaped billet raw material 40.

[0129] The rectangular billet raw material 401 can have a height of 320mm, a width of 220mm, a flange height of 67.5mm, a flange width of 80mm, and a web thickness of 85mm. More dimensional data for rectangular billet raw material 401 can be found at [reference needed]. Figure 12 The annotations in the text.

[0130] Figures 13 to 17 This is a schematic diagram of various hole types provided in the embodiments of this application. These hole types can serve as examples of the first group of hole types mentioned above.

[0131] Figure 13 The hole type 501 shown can be used as an example of the above-mentioned K24 hole type, which can be used to initially compress the height of the above-mentioned H-shaped billet raw material 401 from 320mm to 270mm.

[0132] The distance between the bottom of the groove of the upper roll and the bottom of the groove of the lower roll in the 501 die can be 270 mm, and the distance between the opening of the groove of the upper roll and the opening of the groove of the lower roll can be 150 mm. The radius of the chamfer between the bottom of the groove of the upper roll and the side wall of the 501 die can be 20 mm, and the radius of the chamfer between the opening of the groove of the upper roll and the side wall can be 20 mm.

[0133] Figure 14 and Figure 15 The die type 502 shown can be used as an example of the aforementioned K23 die type. The groove bottom width of the upper roll of die type 502 can be 240mm, the boss width of the lower roll can be 121mm, the side wall slopes of the upper left, lower left, upper right, and lower right of die type 502 can be 12°, 23°, 18°, and 33° respectively, and the boss height of the lower roll of die type 502 can be 76mm.

[0134] like Figure 14 As shown, in the first pass, the distance between the left groove bottom of the upper roll of the 502 and the lower roll boss can be 118mm, and the distance between the right groove bottom of the upper roll of the 502 and the lower roll boss can be 110mm.

[0135] like Figure 15 As shown, in the second pass, the distance between the left groove bottom of the upper roll of the 502 and the lower roll boss can be 83mm, and the distance between the right groove bottom of the upper roll of the 502 and the lower roll boss can be 75mm.

[0136] Figure 16 The hole type 503 shown can be used as an example of the first sub-hole type K22 in the third hole type mentioned above. Figure 17 The hole type 504 shown can be used as an example of the second sub-hole type K21 in the third hole type mentioned above.

[0137] like Figure 16 As shown, the groove bottom width of the upper roll of the pass 503 can be 252 mm, and the boss width of the lower roll can be 155 mm. The slopes of the upper left sidewall, lower left sidewall, upper right sidewall, and lower right sidewall of the pass 503 can be 18°, 35°, 24°, and 33°, respectively. The distance between the left groove bottom of the upper roll and the boss of the lower roll of the pass 503 can be 84 mm, and the distance between the right groove bottom of the upper roll and the boss of the lower roll can be 55.4 mm (not shown in the figure). The thickness of the left leg of the pass 503 can be 59 mm, and the thickness of the right leg can be 62 mm.

[0138] For more information on the shapes and sizes of hole type 503, please refer to [reference needed]. Figure 16 The annotations in the text.

[0139] like Figure 17 As shown, the groove bottom width of the upper roll of the pass 504 can be 273.5 mm, and the boss width of the lower roll can be 190 mm. The slopes of the upper left sidewall, lower left sidewall, upper right sidewall, and lower right sidewall of the pass 504 can be 19°, 34°, 24°, and 29°, respectively. The distance between the left groove bottom of the upper roll and the boss of the lower roll of the pass 504 can be 79 mm, and the distance between the right groove bottom of the upper roll and the boss of the lower roll can be approximately 50 mm (not shown in the figure). The thickness of the left leg of the pass 503 can be 55.7 mm, and the thickness of the right leg can be 59.25 mm.

[0140] Figure 12 The H-shaped billet raw material 401 shown can be rolled sequentially through pass 501, pass 502, pass 503 and pass 504 to obtain an intermediate billet that can smoothly enter the second set of pass rolling.

[0141] The second group of hole types may include hole type 601, hole type 602, hole type 603, hole type 604, hole type 605 and hole type 606, which can be used as examples of hole types K6, K5, K4, K3, K2 and K1 mentioned above, respectively.

[0142] Figure 18 Table 1 shows the key shape dimensions of die 601 to die 602. The aforementioned intermediate billets can be rolled sequentially through die 601 to die 606 to obtain L-shaped steel.

[0143] The roll pass system and L-shaped steel rolling method provided in this application maximize the use of irregularly shaped billet resources through the design of roughing roll pass for irregularly shaped billets. For example, irregularly shaped billet raw materials, such as H-shaped billets, can be used for the production of L-shaped steel, thereby improving production flexibility while ensuring rolling stability and product dimensional accuracy.

[0144] In the description of the embodiments of this application, the terms "upper," "lower," "inner," "outer," "vertical," and "horizontal," etc., indicate orientations or positional relationships relative to the indicated placement of components in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and not to indicate or imply a specific orientation that the device or component must have, or its construction and operation in a specific orientation. They can change accordingly depending on the orientation of the components in the accompanying drawings, and therefore should not be construed as limiting this application. Furthermore, "vertical" in this application is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0145] It should be noted that, in the description of the embodiments of this application, unless otherwise stated, " / " means "or". For example, A / B can mean A or B. The "and / or" in this article is merely a description of the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone.

[0146] In the embodiments of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more, and "at least one" and "one or more" refer to one, two, or more than two. The singular expressions "a," "an," "the," "the," "this," and "this" are intended to also include expressions such as "one or more," unless the context explicitly indicates otherwise.

[0147] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0148] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pass system for producing an L-shaped steel, characterized by, Applied to H-shaped billet raw materials, the pass system includes: The first set of die patterns is used to roll the H-shaped billet raw material into a grooved intermediate billet; The second set of die shapes is used to roll the grooved intermediate billet into the L-shaped steel.

2. The hole pattern system according to claim 1, characterized in that, The first group of aperture types includes: The first perforation type is used to reduce the height of the H-shaped billet raw material; The second pass is used to flatten the flanges of the H-shaped billet raw material; The third hole type is used to reduce the dimensions of the left leg, right leg, and waist of the intermediate billet corresponding to the H-shaped billet raw material.

3. The hole pattern system according to claim 2, characterized in that, The second pass corresponds to two rolling passes, and the distance between the bottom of the groove of the upper roll and the boss of the lower roll included in the second pass is different in the two rolling passes.

4. The hole pattern system according to claim 2 or 3, characterized in that, The third hole type includes a first sub-hole type and a second sub-hole type, wherein the second sub-hole type is used to control the length of the left and right legs of the intermediate blank.

5. The hole pattern system according to claim 4, characterized in that, The first hole type is a box-shaped hole type, with a height of A1 and a groove bottom width of B1. (A- b0)-15 mm≤A1≤(A- b0)+15 mm; 0.5×B0-5 mm≤B1≤0.5×B0+5 mm; Where A is the length of the web of the L-shaped steel, b0 is the flange height of the H-shaped billet raw material, and B0 is the width of the H-shaped billet raw material.

6. The hole pattern system according to claim 5, characterized in that, The groove bottom width of the upper roll of the second die type is A2, the boss width of the lower roll is C2, and the boss height of the lower roll is D2. (A1-30)-10 mm≤A2≤(A1-30)+10 mm; (A1- t0)-5 mm≤C2≤(A1- t0)+5 mm; b0-10 mm≤D2≤b0+10 mm.

7. The hole pattern system according to claim 6, characterized in that, In the first sub-groove type, the distance between the first side of the bottom of the upper roll groove and the boss of the lower roll is h5, h3-5 mm≤h5≤h3+5 mm; Wherein, h3 is the distance between the first side of the bottom of the upper roll groove of the second type and the boss of the lower roll.

8. The hole pattern system according to claim 7, characterized in that, The distance between the first side of the bottom of the groove of the upper roll of the second sub-groove and the boss of the lower roll is h6, (h5-6) mm≤h6≤(h5-3) mm.

9. A method for rolling L-shaped steel, characterized in that, The method, applied to H-shaped billet raw materials, includes: Using the first set of pass patterns in the pass pattern system according to any one of claims 1 to 8, the H-shaped billet raw material is rolled into a grooved intermediate billet; The grooved intermediate billet is rolled into the L-shaped steel using the second set of die patterns in the die pattern system according to any one of claims 1 to 8.

10. The rolling method according to claim 9, characterized in that, The process of rolling the H-shaped billet raw material into a grooved intermediate billet includes: The H-shaped billet raw material is rolled sequentially using the first pass, the second pass, and the third pass included in the first set of pass patterns, and the H-shaped billet raw material is rolled twice using the second pass pattern.

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