Arcuate flat steel vertical rolling groove

Abstract

The application provides a round-arc flat steel vertical rolling groove, the height of the vertical rolling groove is hk, the width of a rolling target flat steel is equal to the height hk, the roll gap of the vertical rolling groove is S, the value range of the roll gap S is 5mm<=S<=50mm, the thickness of the rolling target flat steel is t, the groove bottom width of the vertical rolling groove is bk, bk=t+A, wherein 2mm<=A<=5mm, the groove side slope of the vertical rolling groove is psi, 9<=psi<=12, the groove bottom radius of the vertical rolling groove is R, R=(bk / 2) / cos(psi), the groove opening width of the vertical rolling groove is BK, BK=((hk-S) / 2-(R-R*sin(psi))*tan(psi)*2+bk. The round-arc flat steel vertical rolling groove improves the side edge arc of the round-arc flat steel, reduces the groove processing difficulty, and reduces the risk of heavy skin at the side edge and the plane contact.

Description

TECHNICAL FIELD

[0001] The present application relates to the rolling technology field, and in particular to a kind of arc flat steel vertical rolling groove. BACKGROUND

[0002] Flat bar continuous rolling line mainly produces spring flat steel and round steel, product specifications: flat steel: thickness 6~60mm*width 60~150mm, round steel: φ45~φ65. Production steel grades include SiMn, CrMn, CrV, CrMnB spring flat steel, and medium-low carbon carbon alloy steel, tool steel and clad steel. The existing design of arc flat steel vertical rolling groove uses empirical estimation method, and the size of each position is set according to experience. Whether the groove is good or not depends entirely on the experience of the designer, and the groove bottom and side wall adopt the intersection mode, which has the following technical problems: the groove must be machined with a forming blade, the blade needs to be ground after wear, the worker's grinding technical level is high, the blade cost is high, the radius of the side arc is different from the standard required side wall radius ≈1 / 2t (GB / T1222-2016), and the requirements for incoming materials are high. Improper operation can easily cause batch heavy skin and wire drawing.

[0003] The original arc flat steel vertical rolling groove mainly has the following defects: 1) the groove design relies only on experience and cannot be quantified; 2) the groove is difficult to machine because the groove bottom and side wall are in an intersection mode and can only be machined with a forming blade; 3) the arc of the arc flat steel is significantly different from the national standard, and the side arc radius is close to 3 / 4t; 4) the rolling defects of heavy skin and wire drawing are prone to occur, and the rolling adjustment is difficult. SUMMARY

[0004] The purpose of the present application is to provide an arc flat steel vertical rolling groove. The arc flat steel vertical rolling groove improves the arc of the side edge of the arc flat steel, meets the requirement of GB / T1222-2016 for the side arc radius ≈1 / 2t, reduces the difficulty of groove machining, and reduces the risk of heavy skin at the side edge and flat surface contact.

[0005] To achieve the above purpose, the present application provides the following technical solutions:

[0006] An arc flat steel vertical rolling groove, the groove height of the vertical rolling groove is hk, the width of the rolling target flat steel is equal to the groove height hk, the roll gap of the vertical rolling groove is S, and the roll gap S is in the range of 5≤S≤50mm; the thickness of the rolling target flat steel is t, the groove bottom width of the vertical rolling groove is bk, bk=t+A, wherein 2mm≤A≤5mm; the groove side wall slope of the vertical rolling groove is ψ, 9°≤ψ≤12°; the groove bottom radius of the vertical rolling groove is R, R=(bk / 2) / cos(ψ); and the groove opening width of the vertical rolling groove is BK, BK=((hk-S) / 2-(R-R*sin(ψ))*tan(ψ)*2+bk.

[0007] Further, in the above-mentioned round-arc flat steel vertical rolling groove, a fillet radius of the groove is r, and 2mm≤r≤5mm.

[0008] Further, in the above-mentioned round-arc flat steel vertical rolling groove, the larger the reduction, the larger the value of the groove side wall slope ψ, and when the reduction is ≤20mm, the value of ψ is 9-10°, and when the reduction is >20mm, the value of ψ is 10-12°.

[0009] Further, in the above-mentioned round-arc flat steel vertical rolling groove, t=28mm, hk=b=75mm, ψ=11°, and S=10mm; then hk-S=75mm-10mm=65mm; bk=t+A=28+A, and since 2mm≤A≤5mm, 30mm≤bk≤33mm, and here bk=30mm;

[0010] R=(bk / 2) / cos(ψ)=(30 / 2) / cos(11)=15.28mm;

[0011] BK=((hk-S) / 2-(R-R*sin(ψ))*tan(ψ)*2+bk=(65 / 2-(15.28-15.28*sin(11))*tan(11)*2mm+30mm=37.83mm.

[0012] Further, in the above-mentioned round-arc flat steel vertical rolling groove, the groove fillet radius r is 2mm.

[0013] Further, in the above-mentioned round-arc flat steel vertical rolling groove, the groove bottom is tangent to the groove side wall of the vertical rolling groove.

[0014] Further, in the above-mentioned round-arc flat steel vertical rolling groove, a round arc is used to transition between the groove bottom and the groove side wall of the vertical rolling groove.

[0015] Further, in the above-mentioned round-arc flat steel vertical rolling groove, the groove bottom radius R is equal to half of the thickness t of the rolling target flat steel.

[0016] Further, in the above-mentioned round-arc flat steel vertical rolling groove, 20 two-roller rolling stands are arranged on a continuous rolling production line; 8 stands are arranged for rough rolling, 8 stands are arranged for intermediate rolling, and 4 stands are arranged for finishing rolling, the rough rolling, the intermediate rolling, and the finishing rolling are arranged in a horizontal-vertical alternating manner, and the finishing rolling has 4 live rolls.

[0017] Furthermore, in the above-mentioned vertical rolling pass for arc flat steel, the last 5 stands are arranged in an alternating pattern of 3 horizontal and 2 vertical rolling. The last 5 stands include 1 intermediate rolling stand and 4 finishing rolling stands, of which 1 intermediate rolling stand is a horizontal rolling stand and the 4 finishing rolling stands are vertical rolling stand, horizontal rolling stand, vertical rolling stand, and horizontal rolling stand in sequence. The vertical rolling passes are opened using the vertical rolling pass, and the final horizontal rolling pass produces the finished product. All horizontal rolling passes are made using flat rolls without holes.

[0018] Analysis shows that the embodiment of the vertical rolling mill pass for arc-shaped flat steel disclosed in this invention achieves the following technical effects:

[0019] This circular arc flat steel vertical rolling pass uses an improved and innovative design method, replacing experience-based design with formula calculations. This avoids the need for designers to have sufficient experience to design the pass, as the design formula can be mastered with only basic knowledge of pass design. The original pass pattern was changed from an intersecting pattern to a tangent pattern, with a circular arc transition between the bottom of the groove and the side wall. It can be machined without forming inserts, and only standard round inserts are needed for processing. At the same time, due to the tangent pattern and the circular arc transition, the side of the circular arc flat steel transitions well with the plane, and the overall arc radius is close to 1 / 2t. This also avoids the problem of excessive wire pulling caused by improper thickness of the rolled piece.

[0020] By modifying and reprocessing the vertical rolling mill system, the vertical rolling mill for this arc-shaped flat steel has improved the side curvature of the arc-shaped flat steel, meeting the requirement of GB / T1222-2016 for a side curvature radius of ≈1 / 2t. This reduces the difficulty of milling and also minimizes the risk of overlapping at the contact point between the side and the flat surface. Currently, the flat bar line has cumulatively rolled 60,000 tons of arc-shaped flat steel, with significant improvements in side shape quality. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment (improved) of the present invention;

[0023] Figure 2 This is a schematic diagram of the existing technology (before improvement);

[0024] Figure 3 for Figure 2 The enlarged view of point A in the middle shows the intersection pattern;

[0025] Figure 4 This is a schematic diagram of the structure of an embodiment (improved) of the invention;

[0026] Figure 5 for Figure 4 The magnified view of point B in the middle is in tangent mode.

[0027] Figure 6 For an embodiment of the present application, the thickness t of the target rolled flat steel is 28 mm, and the width b of the flat steel is 75 mm. DETAILED DESCRIPTION

[0028] The present application will be described in detail below with reference to the accompanying drawings and embodiments. Each example is provided by way of explanation of the present application, not limitation. In fact, those skilled in the art will appreciate that modifications and variations to the present application can be made without departing from the scope or spirit of the present application. For example, features shown or described as one embodiment can be used in another embodiment to produce yet another embodiment. It is, therefore, desired that the present application include such modifications and variations as come within the scope of the appended claims and their equivalents.

[0029] In the description of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application, not requiring the present application to be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. The terms "connected", "connected", "provided" used in the present application should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected; it can be directly connected, or it can be indirectly connected through an intermediate part; it can be wired electrical connection, wireless electrical connection, or wireless communication signal connection, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0030] One or more examples of the present application are shown in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and description have been used to label like or similar parts of the present application. As used herein, the terms "first", "second", "third", and "fourth" and the like can be used interchangeably to distinguish one component from another and are not intended to signify location or importance of the individual components.

[0031] Figure 2 The structure diagram of the prior art (before improvement). Figure 3 The structure diagram of the prior art (before improvement). Figure 2 The local enlarged view at A in the middle is the intersecting mode. The pass design of the intersecting mode must use a forming blade, the blade needs to be ground after wear, the worker's grinding skill level is high, the blade cost is high, the side surface radius of curvature during rolling is quite different from the standard required side wall radius of curvature ≈1 / 2t (GB / T1222-2016), the side surface radius of curvature is close to 3 / 4t, the requirements for incoming materials are high, and improper operation can easily cause batch heavy skin and wire drawing.

[0032] As Figure 1 , Figure 4 to Figure 6 shown, according to an embodiment of the present application, a round-arc flat steel vertical rolling groove is provided, the groove height of the vertical rolling groove is hk, the width b of the rolling target flat steel is equal to the groove height hk; the roll gap of the vertical rolling groove is S, and the value of S is 5-50 mm; the thickness of the rolling target flat steel is t, the groove bottom width of the vertical rolling groove is bk, and bk=t+A, wherein 2 mm≤A≤5 mm; the groove side slope of the vertical rolling groove is ψ, and 9°≤ψ≤12°; the groove bottom radius of the vertical rolling groove is R, and R=(bk / 2) / cos(ψ); the groove opening width of the vertical rolling groove is BK, and BK=((hk-S) / 2-(R-R*sin(ψ))*tan(ψ)*2+bk.

[0033] In the above embodiment, hk represents the groove height, hk=the width of the rolling target flat steel. S represents the roll gap, bk represents the groove bottom width, bk=the thickness t of the rolling target flat steel+2 mm-5 mm, (the smaller the value of bk, the better the shape, but the commonality is poor, and the larger the opposite). ψ represents the groove side slope, ψ=9°-12°. R represents the groove bottom radius, R=(bk / 2) / cos(ψ). BK represents the groove opening width, Bk=((hk-S) / 2-(R-R*sin(ψ))*tan(ψ)*2+bk. The dimensions can also be determined by CAD drawing method. The present round-arc flat steel vertical rolling groove is improved and innovatively designed by using formula calculation instead of experience design, avoiding the need for designers to have sufficient experience to design, the formula for design can be mastered as long as the basic knowledge of groove design, the original groove is changed from the intersecting mode to the tangent mode, the groove bottom is tangent to the side wall, and the groove bottom can be turned by turning without forming blades, only standard ordinary circular blades need to be purchased for machining, and at the same time, due to the tangent mode and the round-arc transition, the side of the round-arc flat steel is better transitioned to the plane, the overall arc radius is close to 1 / 2t, and the risk of heavy skin drawing caused by improper thickness of the rolled piece is avoided. By modifying and processing the vertical rolling groove system, the present round-arc flat steel vertical rolling groove improves the arc radius of the side of the round-arc flat steel, meets the requirement of GB / T1222-2016 on the arc radius of the side≈1 / 2t, reduces the difficulty of groove processing, and reduces the risk of heavy skin at the contact between the side and the plane.

[0034] Preferably, as Figure 1 shown, in an embodiment of the present application, the groove opening fillet radius of the vertical rolling groove is r, and 2 mm≤r≤5 mm. r represents the groove opening fillet radius, r=2 mm-5 mm, and the main purpose of the chamfer is to prevent the groove from being damaged and scratched. The chamfer value is beneficial to blunt the sharp corners of the groove opening, avoid the groove from being chipped to have a gap, and even if the rolled piece collides with the groove opening, the rolled piece will not be scratched.

[0035] Preferably, as Figure 1 andFigure 2 As shown in the embodiment of the present application, the greater the reduction, the greater the value of the side wall slope of the vertical rolling groove. The side wall slope is represented by ψ, and ψ = 9°-12° (the greater value is taken for the greater reduction, and the smaller value is taken for the smaller reduction). When the reduction is ≤20 mm, the value of ψ is 9-10°; and when the reduction is >20 mm, the value of ψ is 10-12°. The value of ψ as described above can ensure that the groove fullness is appropriate, avoiding the ear defect caused by excessive groove fullness during rolling, or the instability defect of the rolled piece caused by insufficient groove fullness during rolling.

[0036] Preferably, as Figure 3 to Figure 6 As shown in the embodiment of the present application, the thickness of the rolling target flat steel is t = 28 mm, the width of the flat steel is b = 75 mm, the side wall slope of the vertical rolling groove is ψ = 11°, and S = 10 mm; the groove bottom width bk = t + A = 28 + A, and since 2 mm ≤ A ≤ 5 mm, bk = 30-33 mm.

[0037] 30 mm ≤ bk ≤ 33 mm, and here the groove bottom width bk = 30 mm; the groove bottom radius of the vertical rolling groove is

[0038] R = (bk / 2) / cos(ψ) = (30 / 2) / cos(11) = 15.28 mm; the notch width of the vertical rolling groove is

[0039] BK = ((hk-S) / 2-(R-R*sin(ψ))*tan(ψ)*2+bk = ((75-10) / 2-

[0040] (15.28-15.28*sin(11))*tan(11)*2 mm + 30 mm = 37.83 mm. Preferably, the notch fillet radius r of the vertical rolling groove is 2 mm.

[0041] In the above embodiment, the present application takes the rolling of the rolling target flat steel with the thickness t = 28 mm and the width b = 75 mm, and the 1 / 2t arc as an example for description: the groove height hk = b = 75 mm, the roll gap S is 10 mm, the groove bottom width bk = 28 + (2-5) = 30-33 mm, and here we take 30 mm. The side wall slope of the groove is ψ = 9°-12°, and the side wall slope ψ = 11° is taken considering the reduction. Then the groove bottom radius R = (bk / 2) / cos(ψ) = (30 / 2) / cos(11) mm = 15.28 mm, and the notch width

[0042] BK=((hk-S) / 2-(RR*sin(ψ))*tan(ψ)*2+bk=((75-10) / 2-(15.28-15.28*sin(11))*tan(11)*2mm+30mm=37.83mm. The fillet radius r of the groove is 2mm~5mm, and here the fillet radius r of the groove is taken as 2mm. When rolling the arc flat steel, in order to ensure the side arc radius, two-pass vertical rolling is adopted, and the horizontal rolling mill adopts the non-perforated rolling. The design of the two-pass vertical rolling pass using the present invention can significantly improve the side arc radius. The vertical rolling pass of this arc flat steel improves the side curvature of the arc flat steel, meets the requirement of side curvature radius ≈1 / 2t in GB / T1222-2016, reduces the difficulty of the pass processing, and at the same time reduces the risk of overlapping at the contact between the side and the plane.

[0043] Preferably, such as Figure 4 to Figure 6 As shown, in one embodiment of the present invention, the bottom of the groove of the vertical rolling mill is tangentially set to the sidewall of the rolling mill. A tangential transition is adopted between the bottom of the groove and the sidewall of the rolling mill. The radius R of the bottom of the groove is approximately equal to half the thickness t of the target flat steel being rolled. The tangential transition between the bottom of the groove and the sidewall of the rolling mill allows for machining without the need for forming inserts; only standard round inserts are required. Furthermore, due to the tangential mode and the arc transition, the side of the arc flat steel transitions well to the plane, with an overall radius of curvature close to 1 / 2t, meaning the radius R of the groove is approximately equal to half the thickness t of the target flat steel being rolled. This also avoids excessive wire pulling caused by improper workpiece thickness. By modifying and processing the vertical rolling mill system, this vertical rolling mill for arc flat steel improves the side curvature of the arc flat steel, meeting the requirement of a side curvature radius ≈ 1 / 2t in GB / T1222-2016, thus reducing the difficulty of mill processing. This also reduces the risk of overlapping at the contact points between the sides and the flat surface. To date, the flat bar line has rolled a cumulative total of 60,000 tons of arc-shaped flat steel, resulting in a significant improvement in the quality of the side shape.

[0044] Preferably, such as Figure 1 to Figure 5 As shown, in one embodiment of the present invention, the main rolling mill of the continuous rolling production line is configured with 20 two-high mill stands, including 8 roughing stands, 8 intermediate mill stands, and 4 finishing stands. The roughing, intermediate, and finishing mills are arranged alternately in a horizontal-vertical configuration, and the finishing mill has 4 loopers. Micro-tension rolling is used during the rolling process.

[0045] Preferably, such as Figure 1 to Figure 5As shown, in one embodiment of the present application, the last 5 stands are arranged in 3 flat and 2 vertical alternately; the last 5 stands include 1 intermediate stand and 4 finishing stands, wherein the 1 intermediate stand is flat rolling, and the 4 finishing stands are vertical rolling, flat rolling, vertical rolling and flat rolling in turn; the 2-pass vertical rolling is opened by the vertical rolling pass, and the last 1-pass flat rolling is finished product, and the flat rolling is all by the flat rolling without pass.

[0046] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0047] The arc flat steel vertical rolling pass of the present application is designed by improving and innovating the design method, and the formula calculation is used to replace the experience design, so that the designer needs enough experience to design, the designed formula can be mastered only by having the pass design basic knowledge, the intersecting mode is changed to the tangent mode for the original pass, the groove bottom and the side wall are arc transition, the turning machining can be performed without the forming blade, only the standard circular blade needs to be purchased for machining, and meanwhile, due to the tangent mode and the arc transition, the side surface and the plane of the arc flat steel are well transitioned, the overall arc radius is close to 1 / 2t, and the heavy skin wire drawing caused by the improper thickness of the rolled piece is avoided.

[0048] By re-modifying and machining the vertical rolling pass system, the arc flat steel vertical rolling pass of the present application improves the side edge arc of the arc flat steel, meets the requirement of the side surface arc radius ≈1 / 2t in GB / T1222-2016, reduces the pass machining difficulty, and reduces the risk of the heavy skin at the side edge and plane contact. At present, the flat bar wire has accumulated 60,000 tons of arc flat steel, and the side surface shape quality is obviously improved.

[0049] The above is only the preferred embodiment of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A round arc flat steel vertical rolling groove, characterized in that, The hole height of the vertical rolling groove is hk, the width of the rolling target flat steel is equal to the hole height hk, the roll gap of the vertical rolling groove is S, and the roll gap S is in the range of 5≤S≤50mm; The thickness of the rolling target flat steel is t, the groove bottom width of the vertical rolling groove is bk, and bk=t+A, wherein 2mm≤A≤5mm; The groove side wall slope of the vertical rolling groove is ψ, and 9°≤ψ≤12°; The groove bottom radius of the vertical rolling groove is R, and R=(bk / 2) / cos(ψ); The groove opening width of the vertical rolling groove is BK, BK = (hk - S) / 2 - (R - R sin(ψ) tan(ψ) 2 + bk, The groove bottom radius R of the vertical rolling groove is approximately equal to half of the thickness t of the rolling target flat steel, the groove opening fillet radius of the vertical rolling groove is r, and 2mm≤r≤5mm, The greater the reduction, the greater the value of the groove side wall slope ψ of the vertical rolling groove, When the reduction is ≤20mm, the value of ψ is 9~10°, When the reduction is >20mm, the value of ψ is 10~12°.

2. The round arc flat steel vertical rolling groove according to claim 1, characterized in that, Take t=28mm, hk=b=75mm, ψ=11°, and S=10mm; Then, hk-S=75mm-10mm=65mm; bk=t+A=28+A, since 2mm≤A≤5mm, 30mm≤bk≤33mm, and here bk=30mm is taken; R=(bk / 2) / cos(ψ)=(30 / 2) / cos(11)=15.28mm; BK = (hk - S) / 2 - (R - R sin(ψ)) tan(ψ) 2 + bk = 65 / 2 - (15.28 - 15.28 sin(11)) tan(11) 2mm + 30mm = 37.83mm, b is the width of the flat steel, and t is the thickness of the flat steel.

3. The round arc flat steel vertical rolling groove according to claim 2, characterized in that, The groove opening fillet radius r of the vertical rolling groove is 2mm.

4. The arcuate slit steel stand rolling groove according to claim 1, characterized in that, The groove bottom of the vertical rolling groove is tangentially arranged with the groove side wall of the vertical rolling groove.

5. The arcuate flat steel vertical rolling groove according to claim 4, characterized in that, The groove bottom of the vertical rolling groove and the groove side wall of the vertical rolling groove are transitioned with a circular arc.

6. The arcuate slit steel stand rolling groove according to claim 1, wherein, The main rolling line is configured with 20 two-roller rolling racks online; Among them, 8 racks are rough rolling, 8 racks are medium rolling, and 4 racks are fine rolling, the rough rolling, the medium rolling and the fine rolling are arranged alternately in flat-stand, and the fine rolling has 4 active loops.

7. The round arc shell steel stand rolling groove according to claim 6, characterized in that, The last 5 racks are arranged alternately in 3 flat and 2 vertical rolling; The last 5 racks include 1 medium rolling rack and 4 fine rolling racks, wherein the 1 medium rolling rack is flat rolling, and the 4 fine rolling racks are vertical rolling, flat rolling, vertical rolling and flat rolling in sequence; The vertical rolling of 2 passes is opened with the vertical rolling groove, and the last pass is flat rolling to produce finished products, and the flat rolling all adopts non-groove flat rolling.

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