WO2019179307A1

WO2019179307A1 - On-line roll press hot forming process for hot sheet/strip and application thereof

Info

Publication number: WO2019179307A1
Application number: PCT/CN2019/076972
Authority: WO
Inventors: 肖学文; 李宏图; 方建忠; 沈继刚
Original assignee: 中冶赛迪工程技术股份有限公司; 中冶赛迪上海工程技术有限公司
Priority date: 2018-03-20
Filing date: 2019-03-05
Publication date: 2019-09-26
Also published as: CN108480415B; CN108480415A

Abstract

An on-line roll press hot forming process for a hot sheet/strip, which is used for the hot-bending forming of a hot steel sheet or strip steel, wherein a steel sheet or strip steel (1) that has incoming material that is hot is subjected to a slitting process and a hot-bending process and then becomes profiled steel (4) that has a specified shape; the hot steel sheet or strip steel is first slit-cut and then hot-bent, or first hot-bent and then slit-cut, or undergoes slit-cut and hot-bending synchronous processes, and during the slit-cutting process, the steel sheet or strip steel is slit-cut into strips; During the hot bending process, the steel sheet or the strip steel is continuously hot-bent and formed by means of deformation press roll sets (3). The described process may directly roll-bend the hot sheet/strip into a section of profiled steel, and longitudinally split said section into long strips of profiled steel or long strips of steel sheets; and the long strips of profiled steel may be used directly, or may be sent to a steel structure processing procedure to be welded into profiled steel. In using such a new production process, the cutting and edge processing steps required for processing a steel sheet to form profiled steel may be omitted, and the required welding process may be reduced or eliminated. The production cost is reduced and the production efficiency is increased.

Description

On-line roll hot forming process of hot plate/belt and its application

Technical field

The invention relates to the field of rolling technology in the steel metallurgy industry, in particular to an on-line roll hot forming process of a hot plate/belt.

Background technique

Every year, the steel structure industry uses tens of millions of tons of steel for the construction of steel structures. With the national policy of advancing fabricated steel structures, the demand for steel for steel structures will increase significantly in the future. At present, the steel structure industry generally adopts a combination of a large number of hot-rolled steel sheets and a small amount of hot-rolled steel to complete the main steel structure of the building. The hot-rolled finished steel sheets need to be cut, grouped and continuously welded to meet the required cross-sectional shape. The cutting and welding process not only causes the material to be cut and wasted, the cost increases, but also needs to assist the relevant steel structure group to the production line and a large number of manual operations, so that the cost of the steel structure building increases dramatically.

At present, there are a large number of cold-bending forming equipment capable of producing profiles of various cross-section shapes, such as C-shaped steel, thin channel steel, corrugated steel plate, corrugated steel plate and the like. These profiles are widely used in steel sheet piles, road guardrails, window frames and other building roofs. They have a common feature that the steel plate has a thin thickness and low material strength, and is used for occasions where the force is not strong or the force is small. For the steel structure main building steel, the cross-sectional size is large, the steel plate thickness is thick (generally 10mm ~ 30mm), using the existing cold-bending forming equipment, it is difficult to produce, even if it can be produced, it needs a special production line, and equipment force It can be very large and very uneconomical, so there are almost no cold-formed forming equipment and products with a thickness of ≥10mm.

If in hot rolling mills, including medium and heavy plate production plants and hot strip rolling mills, the high temperature during rolling of the mill is used to make the thicker steel plates directly hot-bending into the steel structure main building steel required cross-section specifications and cross-sectional shapes become possible. Equipment capacity can be greatly reduced, production line can improve the economical efficiency of the product, and only need to be partially modified in the existing production line to complete the product expansion, and can also greatly reduce the processing capacity, investment and cost of the steel structure factory, and also facilitate control. The quality of the final product. The reduction of the cost of steel for main structural steel construction will promote the development of fabricated steel structures with enormous economic and social benefits.

Summary of the invention

In view of the above-mentioned deficiencies of the prior art, the object of the invention is to provide an in-line roll hot forming process of a hot plate/belt, which utilizes hot rolling and hot longitudinal splitting processes directly after rolling steel plate/rolling waste heat. Produce the required sections of various sections.

In order to achieve the above and other related objects, the present invention provides an in-line roll hot forming process for hot plates/belts, which is used for hot bending forming of hot steel sheets or strips, and is expected to be hot steel sheets or strips. After the slitting process and the hot bending process, the steel sheet having the specified shape is formed, and the hot steel sheet or strip is longitudinally cut and then hot-bent, first hot-bent and then longitudinally cut or slit-cutted in synchronization with hot bending. In the slitting step, the steel sheet or the strip is slit and slit; in the hot bending step, the steel sheet or the strip is continuously hot-bent formed by the deformed press roll group.

The process can utilize the residual temperature of the hot plate/belt, which refers to a temperature range in which the steel sheet or strip can be bent, and the temperature range is from 500 ° C to 850 ° C; the process can be directly Hot plate/belt—such as high-temperature steel plate or strip steel directly rolled and bent into a specific section of steel section, and longitudinally split into strip steel, or long strip steel; long strip steel can be used directly or can be sent to steel structure processing process welding steel. With this new production process, the cutting and edge processing steps required for the steel sheet forming steel can be omitted, and the required welding process can be reduced or eliminated. Reduce production costs and increase production efficiency.

Further, in the hot bending process, a plurality of pairs of perforated grooves are used to continuously deform the hot steel sheet or the strip, and the steel sheet is gradually changed into a section of the section having a specified cross-sectional shape.

Further, in the hot bending process, in the forming direction, the shape of the deforming pressure roller is changed from shallow to deep, and the spacing between the pore shapes is correspondingly narrowed from width to width, and the deforming roller at the end has a final section depth and width; The section becomes smaller as the depth of the deformation roller is deepened, and finally reaches the final sectional shape.

Further, in the slitting process, the slitting is performed directly by the slitting device. Such as disc shears and other cutting.

Further, the slitting step is gradually thinned by the thinning press roller to the position where the slitting is required, and finally cut by the slitting shearing or the thinning pressing roller at the end. That is, for the plate, it can be gradually thinned by a plurality of sets of thinning rolls, and finally crushed by the thinning press roll or sheared by another slit.

Further, the thinning pressing roller is disposed upstream or downstream of the deformation pressing roller, or the thinning pressing roller and the deformation pressing roller are integrally provided.

Further, the longitudinally cut steel plate or strip side portion is a parallel fracture, and has a V-shaped slit or an X-shaped slit.

Further, a transverse slitting device is provided before or after the hot bending process to laterally sizing the steel sheet or the strip.

The invention also provides an application of the hot rolling plate/belt in-line roll hot forming process in a medium and heavy plate rolling mill production line or a furnace coil production line, wherein the longitudinal cutting process and the hot bending process corresponding to the work station are arranged in the medium thick plate After the rolling mill production line or the rolling mill production line, the steel plate or strip steel directly enters the slitting process and the hot bending process from the rolling mill; or the station corresponding to the slitting process and the hot bending process is arranged in the plate mill production line or the furnace coil production line The end of the wire is fed through a slitting process and a hot bending process.

The invention also provides an application of the hot roll forming process of the hot plate/belt in a hot rolling rolling line, wherein the vertical cutting process and the hot bending process correspond to a station arranged at the exit of the finishing mill or the output roller Other locations, or placed on the extension roller path behind the coiler.

The invention also provides an application of the hot rolling plate/belt in-line roll hot forming process on a heat treatment line or a reheating line, the process being applied to a heat treatment line or cooperating with a reheating line, the hot steel plate or strip steel Processing of formed steel.

The invention has the beneficial effects that the hot-rolled sheet/belt roll-on-line thermoforming production line is arranged next to the plate plate (furnace coil), hot-rolled strip steel or heat treatment production line, compared with the conventional cold-rolled steel sheet rolling. The forming steel process effectively utilizes the post-rolling waste heat, simplifies the forming process and process, saves transportation and intermediate reversing links, doubles the production efficiency of steel parts, greatly reduces the processing cost of steel sections, and reduces the residual stress of finished steel products. The corners are small and the mechanical properties are greatly improved.

The on-line roll forming thermoforming process of the hot plate/belt changes the current state of production of large-section steel parts that can only be produced by welding, and changes the current situation that high-strength and thick-form steels are difficult to form using cold bending (or partial hot bending).

In short, the hot-rolled steel sheet roll forming process fills the blank of the continuous hot-bending forming technology of steel sheets at home and abroad, and has a positive effect on resolving the overcapacity of the current hot-rolled sheets (belts) in China, and also promotes the production of steel and steel structures. The deep integration and innovation of the industrial chain has a positive significance.

DRAWINGS

1 is a schematic view showing a change trend of a hole shape of a deformed press roll set of the present invention;

2 is a schematic view showing a process of changing a section of a billet in a hot bending forming process of the present invention;

3 is a schematic structural view of a deformed press roll set and a corresponding steel plate or strip according to the present invention;

4 is a schematic view showing the arrangement of the first strip reheat forming according to the present invention;

Figure 5 is a schematic view showing the arrangement of the first hot bending forming and further slitting according to the present invention;

Figure 6 is a schematic view showing the slitting slitting of the disc of the present invention;

7 is a schematic view showing the arrangement of slitting and re-bending forming by using the first step-by-step thinning in the present invention;

Figure 8 is a schematic view showing the arrangement of the present invention using the first hot bending forming and then gradually thinning for slitting;

Figure 9 is an embodiment of the thinning press roll of the present invention;

Figure 10 is another embodiment of the thinned pressure roller of the present invention;

Figure 11 is a schematic view showing the process of stepwise thinning using the thinned pressure roller of Figure 10;

Figure 12 is a schematic view showing the arrangement of the thinning roller ring on the deforming press roller for slitting according to the present invention;

Figure 13 is a schematic view showing the thinned roller ring of Figure 12 disposed on a deforming press roll;

Figure 14 is a schematic view showing various cuts formed by slitting of the present invention;

Figure 15 is a schematic view showing the arrangement of a continuous surface of a continuous hot bending forming apparatus in a medium and heavy plate rolling mill production line according to Embodiment 2 of the present invention;

Figure 16 is a plan view showing the layout of the continuous hot bending forming device arranged in the rolling mill of the medium and heavy plate rolling mill in the second embodiment of the present invention (striping in front and forming in the rear);

Figure 17 is an enlarged view of the inside of the broken line frame of Figure 16;

Figure 18 is a schematic plan view showing another planar arrangement of the continuous hot bending forming apparatus disposed in the rolling mill of the plate mill after the embodiment 2 of the present invention (formed in front and striped in the back);

Figure 19 is an enlarged plan view of the dotted line in Figure 18;

Figure 20 is a plan view showing the layout of the continuous hot bending forming device disposed at the end of the production line of the plate mill according to the embodiment 2 of the present invention (striping in front and forming in the rear);

Figure 21 is a plan view showing the layout of the continuous hot bending forming device disposed at the end of the production line of the plate mill according to the embodiment 2 of the present invention (formed in front and stripped in the back);

Figure 22 is a schematic view showing the arrangement of the continuous hot bending forming device in the furnace roll production line in the third embodiment of the present invention;

Figure 23 is a plan view showing the layout of the continuous hot bending forming apparatus in the furnace coil production line in the third embodiment of the present invention (striping in front and forming in the rear);

Figure 24 is a schematic view showing another planar arrangement of the continuous hot bending forming apparatus in the furnace coil production line according to Embodiment 3 of the present invention (molding in front and striping in the back);

Figure 25 is a schematic view showing the arrangement of a continuous surface of a continuous hot bending forming apparatus in a hot continuous rolling production line according to Embodiment 4 of the present invention;

Figure 26 is a plan view showing the layout of the continuous hot bending forming apparatus in the hot strip rolling production line in the fourth embodiment of the present invention (striping in front and forming in the rear);

Figure 27 is a schematic view showing another planar arrangement of the continuous hot bending forming apparatus in the hot strip rolling production line in the front and the strips in the fourth embodiment of the present invention;

28 is a schematic plan view showing the plane arrangement of the continuous hot bending forming apparatus in the heat treatment line according to Embodiment 5 of the present invention (the strip is in front and formed in the back);

Figure 29 is a plan view showing the layout of a continuous hot bending forming apparatus in a heat treatment line according to Embodiment 5 of the present invention (molding in front and striping in the back).

detailed description

The embodiments of the invention are described below by way of specific embodiments, and those skilled in the art can readily appreciate other advantages and advantages of the invention from the disclosure.

Example 1

The invention provides an in-line roll hot forming process of a hot plate/belt, which is used for hot bending forming of a hot steel plate or strip steel, and after the hot steel plate or strip is subjected to a slitting process and a hot bending process a profiled steel having a predetermined shape, wherein the slitting step is performed before the hot bending step or after the slitting step, after the hot bending step, in the slitting step, the high temperature steel sheet or the strip is slit and slit; In the hot bending process, the high temperature steel sheet or the strip is continuously hot-bent formed by the deformation press roll group. The hot state and high temperature refer to a temperature range in which a steel sheet or a strip can be thermally bent, and the temperature ranges from 500 ° C to 850 ° C.

The process utilizes the high temperature of the material itself to facilitate continuous deformation of the plate or belt, and the hot steel plate or strip is easily deformed, facilitating the manufacture of specific and complicated steel sections, and facilitating the forming of the medium and heavy plates/belts.

Preferably, in the hot bending step, a plurality of pairs of perforated grooves are used to continuously deform the high-temperature steel sheet or the strip, and the steel sheet is gradually changed into a section having a specified cross-sectional shape.

FIG. 1 is a schematic view showing the change trend of the hole shape of the deformation press roller 3, which shows only the change trend of the hole shape, and does not limit the number of the deformation press rolls 3; FIG. 2 is a schematic view of the deformation process of the steel plate or the strip steel ( Taking the channel steel as an example, FIG. 3 is a schematic structural view of a pair of deforming press rolls 3, including an upper press roll 31 and a lower press roll 32, and the upper press roll 31 and the lower press roll 32 are provided with matching projections and recesses. A hole pattern 33 is formed, wherein 100 is a deformed steel plate or strip.

As shown in FIG. 1 and FIG. 2, in the hot bending process, along the forming direction, the shape 33 of the deforming press roller 3 at the initial stage is shallow, the spacing between the hole patterns 33 is wide, and the deformation of the steel sheet or the strip section is also Less, the hole pattern 33 of the subsequent deformation press roller 3 is gradually deepened, and the pitch between the hole patterns 33 is correspondingly narrowed, and finally the deformation press roller 3 having the final section depth and width; the section of the steel plate or strip follows The deformation pressure roller 3 is deepened in depth, the width is reduced, and finally reaches the final sectional shape, such as C-type, H-type, Z-type, and the like.

In one embodiment, for a thinner plate member, the slit can be cut directly; in the slitting process, the slitting is directly performed by the slitting device 2; the plan layout is as shown in FIG. 4 and FIG. In Fig. 4, the slitting device 2 is disposed before the deforming press roller 3, and in Fig. 5, the slitting device 2 is disposed after the deforming press roller 3, and the blank 1 is formed by slitting and hot bending to form the finished member 4.

Wherein, the slitting device 2 can adopt a disc cutter, and directly slits the strip by the disc cutter, and directly cuts the staggered upper shear disc 21 and the lower shear disc 22, and forms a parallel fracture at the slit, and the shearing diagram thereof is as shown in the figure. 6 is shown.

In another embodiment, the slitting process is gradually thinned by the thinning press roller 6 at a position that needs to be cut, and finally cut by the slitting shearing or the endmost thinning pressing roller 6, thereby realizing slitting. . For example, for thicker steel plates or strips, if the disc shear cannot be directly cut, a stepwise thinning method can be used:

1. As shown in FIG. 7 , a plurality of sets of thinning press rolls 6 are separately arranged before the set of the deforming press rolls 3, and the position where the strip or the steel plate needs to be cut is gradually thinned, and after the thinning is cut by another slitting Broken, or cut by the end of the thinning roller.

2. As shown in Fig. 8, after the group of deforming pressure rollers 3, a plurality of sets of thinning pressing rollers 6 are separately arranged, and the position where the strip or the steel sheet needs to be cut is gradually thinned, and after thinning, the slitting shear is separately set. Broken or squeezed by the thinning press roller 6 at the end.

The above-mentioned thinning press roller 6 can adopt the structure shown in FIG. 9, the cross-section of the upper pressing roller 61 is V-shaped, and the lower pressing roller 62 is a round roller, and the thinning process is as shown in FIG. The edge of the thin upper pressing roller 61, the cutting edge and the corresponding slit are gradually deepened, and finally a single-sided V-shaped slit is formed to facilitate welding.

The above-mentioned thinning pressing roller 6 can adopt the structure shown in FIG. 10, and the thinning upper pressing roller 61 and the thinning lower pressing roller 62 each have a V-shaped cross section edge and are oppositely disposed, and the thinning process is similar to that of FIG. Finally, an X-shaped cut (ie, a double-sided V-shaped cut) is formed.

3. As shown in FIG. 12, a thinning roller ring is disposed on part or all of the deformation pressing roller 3, and the thinning roller ring and the deformation pressing roller 3 are integrally provided, and the longitudinal cutting and the hot bending forming are simultaneously performed, and the thinning is performed by The slitting shears are set separately or cut by the thinning roller ring at the end.

The thinned roller ring has a V-shaped or trapezoidal cross section, and may be disposed on the upper pressing roller 31 or the lower pressing roller 32 of the deforming pressing roller 3 to finally form a V-shaped slit; or the upper pressing roller 31 and the lowering of the deforming pressing roller 3 Each of the pressure rollers 32 is provided with a thinned roller ring 34. As shown in FIG. 13, the thinned roller ring 34 is provided with the projections of the upper pressing roller 31 and the concave portion of the lower pressing roller 32, and is disposed oppositely, and the structure finally forms an X-shaped section. The mouth, wherein the cross section of the thinned roller ring may be V-shaped, trapezoidal, oblique wedge, etc., in this example, an isosceles trapezoid or a V-shape is preferred.

In this example, the structure in which the parallel fracture, the V-shaped slit, and the X-shaped slit are formed is as shown in FIG. The V-shaped and X-shaped cut-outs allow the steel or steel edges to be directly welded without the need for milling or reducing the amount of milling. It does not need to be like a cold-formed steel. It needs to be opened and re-formed to estimate the yield.

The apparatus corresponding to the above-described hot bending process and slitting process constitutes a continuous hot bending forming apparatus including any one of the above arrangements.

Example 2

The invention also provides an application of the on-line roll hot forming process of the hot plate/belt according to the embodiment 1 in the production line of the plate mill, the vertical cutting process and the hot bending process corresponding to the station (ie continuous hot bending) The molding apparatus 200) is disposed on the exit roller path of the plate mill. Referring specifically to FIG. 16, the continuous hot bending forming apparatus 200 is disposed downstream of the finishing mill 104 of the plate mill production line, and the steel sheet directly enters the slitting process from the rolling mill. And the hot bending process; thereby achieving continuous hot bending after hot rolling, making full use of the residual temperature of hot rolling.

Figure 15 is a schematic elevational view showing the continuous hot bending forming apparatus 200 of the present invention disposed after the finishing mill of the plate mill production line.

As shown in FIGS. 16 and 17, in this example, preferably, the plate mill production line includes a heating furnace 101, a high pressure water descaling device 102, a roughing mill 103, a finishing mill 104, which are sequentially disposed, and the continuous hot bending forming apparatus 200. The hot strip forming unit 106 and the hot bending forming unit 108 are disposed. The hot striping unit 106 is disposed after the finishing mill 104. A centering device 105 is disposed between the hot striping unit 106 and the finishing mill 104. The continuous hot forming apparatus 200 is provided. A centering device 107 is disposed between the hot-striping unit 106 (slipping device) and the hot-bending forming unit 108 (the deforming roller 3), wherein the slitting can be performed before, after or simultaneously with the hot bending, in continuous hot bending forming A cross-cutting device 109 is disposed laterally to the downstream of the device 200, and a cold bed gantry 110 or the like is disposed downstream of the cross-cutting device 109. The cross-cutting device may be a flying shear or a flying saw or the like.

18 and 19 are schematic views showing the arrangement of the thermal slitting unit 106 of the continuous hot bending forming apparatus 200 after the hot bending forming unit 108; the centering unit 105 is disposed between the hot bending forming unit 108 and the finishing rolling mill 104.

In another embodiment, the slitting process and the hot bending process corresponding to the station (ie, the continuous hot bending forming apparatus 200) are disposed at the end of the rolling line, and the end of the rolling line refers to the finishing rolling, straightening, etc. Before the cold bed, the continuous hot bending forming device 200 is directly passed through the roller table (not arranged along the original cooling line 114, arranged side by side with the original finishing line), and the continuous hot bending forming device 200 also includes slitting before the hot bending, Three cases are performed after or at the same time, wherein the thermal slating unit 106 includes a method of disc shearing and thinning and cutting. Specifically, as shown in FIG. 17, the plate mill production line includes a heating furnace 101, a high pressure water descaling device 102, a roughing mill 103, a finishing mill 104, an ACC cooling device 11, a hot straightening machine 112, and a hot slitting. Machine 113, cooling bed 114, cutting head shear 115, double side shear 116, fixed length shearing 117, cold straightening machine 118, fixed length traverse gantry 119, steel plate collecting device 120, etc.; continuous hot bending forming device of the present invention 200 is arranged after the hot slitting machine 113 or the hot straightening machine 112, the steel plate or strip steel can be divided into two paths after passing through the hot straightening machine 112 and the hot slitting machine 113, and all the way into the cooling bed to be cooled or finished after being cooled; The other way directly enters the continuous hot bending forming device 200; FIG. 20 shows a manner in which the striping is in front and formed in the rear, and a centering device 105 can be disposed between the hot slitting unit 106 and the hot slitting machine 113, and the heat is divided. A centering device 107 is disposed between the strip unit 106 and the hot bending forming unit 108, and a cross cutting device 109, a cooling stage 110, and the like are disposed downstream of the hot bending forming unit 108.

Figure 21 is a schematic view showing the arrangement of the continuous hot bending forming apparatus 200 at the end of the rolling line, except that it is formed in the front and the striping is in the rear, and a centering device is provided between the hot bending forming unit 108 and the hot slitting machine 113. 105. A cooling gantry 110, a cross-cutting device 109, and a collecting gantry 123 are disposed downstream of the hot-striping unit 106.

Referring to the manner of FIG. 21 and FIG. 18, the hot-striping unit 106 is incorporated into the hot-bending forming unit 108, that is, a thinning roll ring is disposed on the press roll of the hot-bending forming unit 108, and is gradually reduced. Thin, and finally cut off.

This embodiment is intended to illustrate the arrangement of the continuous hot-bending forming device, in conjunction with the plate mill production line, where the various devices in the plate mill production line can be increased or decreased depending on the respective functional requirements.

Example 3

On this basis, the present invention also provides an application of the hot roll sheet/belt in-line roll hot forming process of the first embodiment in the furnace roll production line, wherein the continuous hot bending forming device 200 also includes the embodiment 1. The striping is performed before the hot bending, the striping is performed after the hot bending, and the striping and the hot bending are performed simultaneously. The hot striping unit 106 includes the disc shearing and thinning cutting. The production line arrangement is similar to that of the implementation 2, which is placed after the finishing mill or at the end of the rolling line. The difference is that in this example, the roughing mill 103 is followed by a furnace rolling mill 121.

Fig. 22 is a schematic elevational view showing the continuous hot bending forming apparatus 200 of the present invention disposed after the hearth rolling mill 121 of the coil winding line. Figure 23 is a plan view showing the continuous hot bending forming apparatus 200 of the present invention disposed after the hearth rolling mill 121 of the coil winding line, wherein 122 is a collecting stand, and the rest is similar to that of the second embodiment.

Figure 24 is a plan view showing the continuous hot bending forming device of the present invention disposed on the furnace coil production line, the continuous hot bending forming device is arranged at the end of the rolling line, and the steel plate directly enters the continuous hot bending forming device 200 after passing through the roller table, and the rest and the embodiment 2 similar. In this example, it is intended to explain the arrangement position of the continuous hot bending forming device and the way of docking with the furnace coil production line, and the equipment in the coil winding production line can be increased or decreased according to the corresponding functional requirements.

Example 4

The invention also provides an application of the hot rolling plate/belt in-line roll hot forming process of the hot plate/belt in the tropical steel continuous rolling mill, wherein the vertical cutting process and the hot bending process corresponding to the station are arranged at the finishing mill exit or The other position of the output roller path is placed on the extension roller path behind the coiler. The other position of the output roller path refers to any position of the output roller path between the finishing mill exit and the coiler 210.

Referring specifically to Figure 25, in one embodiment, the continuous hot bend forming apparatus 200 of the present invention is disposed downstream of the finishing train 208 at the exit of the finishing mill. In this example, the composition of the hot strip mill is schematically shown. As shown in FIG. 26, it includes a heating furnace 201, a coarse descaling tank 202, a first roughing mill 203, and a second roughing mill 204. a hot coil box 205, a flying shear 206, a fine scale removing tank 207, a finishing rolling mill 208, a laminar cooling device 209, a coiler 210, wherein the continuous hot bending forming device 200 of the present invention is disposed behind the coiler 210, FIG. 26 shows an arrangement of re-forming the strips first. A centering device 211 is disposed between the hot-striping unit 106 and the coiler 210, and a centering device 212 is disposed between the hot-bending forming unit 108 and the hot-striping unit 106. . A cross-cutting device 213 and a cooling gantry 214 are further disposed after the hot-bending forming unit 108 and the hot-striping unit 10; the hot strip mill production line can be increased or decreased according to demand.

Figure 27 shows the arrangement of the first forming and re-striping. After the hot-striping unit 106 is disposed, the centering device 211 and the hot-striping unit 106 are disposed between the hot-bending forming unit 108 and the coiler 210. There may or may not be centered with the hot bend forming unit 108, and the cooling gantry 214, the cross cutting device 213, and the collecting gantry 215 are sequentially disposed downstream of the hot splicing unit 106.

The above two arrangements also include the striping before the hot bending, the striping after the hot bending, the striping and the hot bending simultaneously performing three cases, wherein the slitting device comprises the disc shearing and the thinning cutting manner.

Example 5

The invention also provides an application of the hot-rolled sheet/belt in-line roll hot forming process of the first embodiment to a heat treatment line or a reheating line, the process being applied to a heat treatment line or cooperating with a reheating line to heat The steel sheet or strip steel is formed into a steel, and the continuous hot bending forming apparatus 200 is disposed on the output roller of the heat treatment furnace, that is, after the heat treatment furnace, and other equipment may be spaced or not spaced from the heat treatment furnace.

Referring specifically to Figure 28, in particular, the continuous hot bend forming apparatus 200 of the present invention is disposed downstream of the heat treatment straightener 304 in parallel with the original heat treatment scale cut 306. Preferably, the heat treatment line of the present invention includes the upper ones arranged in sequence. Material device 301, shot blasting machine 302, heat treatment furnace 303, heat treatment straightening machine 304, heat treatment cold bed 305, heat treatment fixed length shear 306 and collecting device 307; the heat splitting unit 106 of the present invention is disposed after the heat treatment straightening machine 304 A centering device 308 is disposed between the hot-bending forming unit 108 and the heat-striping unit 106, and a centering device 309 is disposed between the hot-bending forming unit 108, and the cross-cutting device 310 and the cooling table are disposed behind the hot-bending forming unit 108. Rack 311. As shown in FIG. 29, when the hot-striping unit 106 is behind the hot-bending forming unit 108, the hot-bending forming unit 108 and the hot-striping unit 106 may or may not be centered, and the hot-striping unit 106 may be sequentially disposed downstream. The cooling gantry 311, the cross-cutting device 309, and the collecting gantry 312. In other embodiments, the continuous hot bend forming apparatus 200 may be disposed at other locations after the heat treatment furnace, which may increase or decrease the equipment as needed.

The beneficial effects of the invention are:

Make full use of the existing medium and heavy plate, hot strip rolling, furnace rolling mill or heat treatment line equipment, and use the residual temperature of the rolled steel plate or strip to directly bend into the profile steel to meet the required thickness of the fabricated building, and expand the supply of the existing production line. Side products, the ability to release existing production lines; the production of large-thickness steel can be directly used for the production of steel structures in prefabricated buildings, replacing the existing production lines such as the cold forming production line and the opening of the steel structure plant, and the cold bending cannot be Some of the products achieved (such as cracking at the rounded corners), thereby reducing the cost of the assembled steel structure and improving competitiveness.

The hot-bending steel breaks through the limitation of the section specification, and can produce various types of steel with large section thickness specifications, which fills the blank of such products through bending; the hot roll/belt online roll forming thermoforming production line is easy to arrange in the middle thickness Multiple positions of the plate (furnace coil), hot-rolled strip or heat treatment production line, without affecting the production of the existing production line, facilitating the technical transformation of existing enterprises.

Any of the above-described embodiments may be modified or altered without departing from the spirit and scope of the invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and scope of the invention will be covered by the appended claims.

Claims

An on-line roll forming thermoforming process for hot plates/belts for hot bending of hot steel sheets or strips, characterized in that the hot plate or strip is subjected to a slitting process and a hot bending process. Afterwards, it becomes a profiled steel having a specified shape, and the hot-formed steel sheet or strip is longitudinally cut and then hot-bent, first hot-bent and then slit-cut or slit-cut in synchronization with hot bending, in the slitting process, the steel sheet or The strip is subjected to slitting and slitting; in the hot bending step, the steel sheet or the strip is continuously hot-bent formed by the deformed press roll group.
The on-line roll forming thermoforming process of a hot plate/belt according to claim 1, wherein in the hot bending process, a plurality of pairs of grooved deformation rolls are used to continuously heat the steel plate or strip. The deformation gradually transforms the steel sheet into a section of the steel section having a specified sectional shape.
The hot roll forming process of a hot plate/belt according to claim 1, wherein in the hot bending step, the shape of the deforming press roll is changed from shallow to deep in the forming direction, and the hole type is The spacing is correspondingly narrowed from width to width, and the deforming roller at the end has a final section depth and width; the section of the steel sheet becomes smaller as the depth of the deformation roller is deepened, and finally reaches the final sectional shape.
The in-line roll thermoforming process for a hot plate/tape according to any one of claims 1 to 3, characterized in that the slitting process is carried out by slitting directly through the slitting device.
The in-line roll hot forming process of a hot plate/belt according to any one of claims 1 to 3, characterized in that the slitting step is gradually thinned by reducing the position of the press roll to be cut. Finally, it is cut by the slitting shear or the thinning pressing roller at the end.
The on-line roll hot forming process of a hot plate/belt according to claim 5, wherein the thinned press roll is disposed upstream or downstream of the deformation press roll, or the thinned press roll and the deformed press roll Set to one.
The in-line roll hot forming process of a hot plate/belt according to claim 1, wherein the longitudinally cut steel plate or strip edge is a parallel fracture, having a V-shaped cut or an X-shaped cut. .
An application of an in-line roll hot forming process of a hot plate/belt according to any one of claims 1 to 7 in a medium and heavy plate mill production line or a coil production line, characterized in that the slitting process and After the hot bending process corresponds to the station arranged in the mill of the plate mill or the coil production line, the steel plate or strip directly enters the slitting process and the hot bending process from the rolling mill; or the station corresponding to the slitting process and the hot bending process It is located at the end of the plate rolling mill production line or the furnace coil production line rolling line, and is fed into the slitting process and the hot bending process through the roller conveyor.
An application of an on-line roll hot forming process of a hot plate/belt according to any one of claims 1 to 7 in a hot strip rolling production line, characterized in that: a slitting process and a hot bending process The station is placed at the exit of the finishing mill or at another location of the output roller, or on the extension roller behind the coiler.
An application of an in-line roll hot forming process of a hot plate/tape according to any one of claims 1 to 7 on a heat treatment line or a reheating line, characterized in that the process is applied to a heat treatment line or Cooperate with the reheating line to form a steel sheet from hot steel or strip.