Square steel multi-line slitting rolling method

Abstract

The invention relates to the technical field of section steel slitting and rolling, and discloses a square steel multi-line slitting and rolling method which comprises the steps that S1, a steel billet is heated, and the stepping speed of a stepping device and the heating temperature of a heating furnace are adjusted according to the real-time temperature of the heated section of the steel billet; s2, the heated steel billet is subjected to rough rolling; s3, medium rolling is conducted on the rolled piece subjected to rough rolling; and S4, the rolled piece subjected to intermediate rolling is subjected to finish rolling, and the slitting rolling speed is adjusted according to the extension coefficient of the steel billet and the real-time rolling temperature. By adjusting the stepping speed of the stepping device and the heating temperature of the heating furnace, uniform heating of the steel billets is guaranteed, local overheating or incomplete local heating is avoided, the rolling effect of the steel billets is prevented from being affected, meanwhile, the slitting rolling speed of the steel billets is adjusted in real time, the conditions of steel stacking and steel sticking and the like are avoided, and the production efficiency of the steel billets is improved. And the quality is guaranteed, meanwhile, the multi-line slitting rolling technology of the small-specification square steel is achieved, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of slitting and rolling of section steel products, in particular to a multi-line slitting and rolling method for square steel. Background Art

[0002] Square steel is a common product of hot-rolled steel products, which refers to steel that is rolled or processed into a square cross-section. The side length of hot-rolled square steel is usually 5-250mm.

[0003] In practical applications, 10-20mm square steel products are widely used, but their unit weight is relatively small, only 0.785-3.14kg / m. Limited by the rolling speed of the rolling mill on the production line, the traditional single-line production of these specifications of products has a very low output, and the cost per ton of steel is relatively high. The inventor found that the successful application of slitting technology in the production of rebar, but no one has ever considered and practiced this in the production of square steel. The multi-line slitting rolling process is prone to local overheating or incomplete local heating due to the complex process control of rolling speed, hole design, etc. In order to solve the problems in the heating of traditional square steel single-line production, the inventor proposed the present invention to solve the pain points. Summary of the invention

[0004] In order to solve the above problems, the present application provides a square steel multi-wire slitting and rolling method, comprising:

[0005] Step S1, transferring the steel billet to a heating furnace for segmented heating, detecting the real-time temperature of the heated section of the steel billet by a temperature detection device provided in the heating furnace, comparing the real-time temperature of the heated section of the steel billet with the internally set standard temperature range, and adjusting the stepping speed of the stepping device and the heating temperature of the heating furnace according to the comparison result until the heating of the steel billet is completed;

[0006] Step S2, conveying the heated steel billet to a rough rolling mill group for rough rolling, wherein the rolling mills of the rough rolling mill group are arranged alternately in horizontal and vertical directions;

[0007] Step S3, transferring the rough-rolled workpiece to an intermediate rolling mill for intermediate rolling, wherein the rolling mills of the intermediate rolling mill are arranged alternately in a horizontal and vertical manner;

[0008] Step S4, transferring the rolled piece that has completed the intermediate rolling to the finishing mill group for finishing rolling, wherein the finishing mill group is provided with six rolling mills, which are arranged in a flat-vertical-flat-flat-flat-flat-flat manner, and the six finishing mills are arranged in sequence with flat rolls, box-shaped holes, pre-cut elliptical holes, cut diamond-square holes, diamond holes, and diamond-square holes. The rear end of the finishing mill arranged with pre-cut elliptical holes is provided with a material type detection device for detecting the real-time cross-sectional area and real-time rolled length of the rolled piece after pre-cutting rolling, and the rear end of the finishing mill arranged with pre-cutting is also provided with a surface temperature measuring device , used to detect the real-time rolling temperature of the rolled piece after pre-slitting and rolling. The finishing mill is provided with a central control module, in which the original cross-sectional area of ​​the rolled piece and the length of the raw material billet are provided. The central control module calculates the elongation coefficient of the rolled piece according to the real-time cross-sectional area of ​​the billet, the real-time rolled length, the original cross-sectional area and the length, and adjusts the slitting and rolling speed according to the elongation coefficient of the rolled piece and the real-time rolling temperature. The rolled piece that has passed through the slitting rhombus hole is then rolled through the rhombus hole and the rhombus square hole to complete the multi-line slitting and rolling of the square steel.

[0009] Optionally, in step S1, the step control module is provided with a front end standard temperature Tb and a front end standard temperature difference ΔTb, the billet is in and out from the side, the front end of the billet in the moving direction in the heating furnace is used as the front end of the heated section of the billet, and the rear end of the billet in the moving direction in the heating furnace is used as the tail end of the heated section of the billet, the temperature detection device detects the front end real-time temperature Tq of the front end of the heated section, and the step control module calculates the front end real-time temperature difference ΔTq of the front end of the heated section according to the front end real-time temperature Tq and the front end standard temperature Tb, ΔTq=|Tb-Tq |, the step control module compares the front-end real-time temperature difference ΔTq with the front-end standard temperature difference ΔTb. When ΔTq≤ΔTb, the step control module determines that the front-end real-time temperature difference of the heated section does not exceed the front-end standard temperature difference, and the step control module does not adjust the stepping speed of the stepping device; when ΔTq>ΔTb, the step control module determines that the front-end real-time temperature difference of the heated section exceeds the front-end standard temperature difference, the step control module compares the front-end real-time temperature with the front-end standard temperature, and adjusts the stepping speed of the stepping device according to the comparison result.

[0010] Optionally, when the step control module determines that the front end real-time temperature difference of the heated section exceeds the front end standard temperature difference, the step control module compares the front end real-time temperature Tq with the front end standard temperature Tb. When Tq<Tb, the step control module determines that the front end real-time temperature of the heated section is lower than the front end standard temperature, and the step control module controls the stepping device to perform a stepping stop operation. The temperature detection device detects the front end real-time temperature Tq' of the heated section, and the step control module calculates the front end real-time temperature difference ΔTq' until ΔTq'≤ΔTb or Tq'>Tb, and the step control module controls the stepping device to stop the stepping stop operation; when Tq>Tb, the step control module determines that the front end real-time temperature of the heated section is higher than the front end standard temperature, and the temperature detection device detects the tail end real-time temperature of the tail end of the heated section, and the step control module adjusts the stepping speed of the stepping device according to the tail end real-time temperature.

[0011] Optionally, the step control module is provided with an initial step speed Rc of the step device, and the step control module is also provided with a standard heating temperature difference ΔTc. When the step control module determines that the front end real-time temperature of the heated segment is higher than the front end standard temperature, the temperature detection device detects the tail end real-time temperature Tw of the tail end of the heated segment, and the step control module calculates the real-time heating temperature difference ΔTz according to the front end real-time temperature Tq and the tail end real-time temperature Tw of the heated segment, ΔTz=Tq-Tw, and the step control module calculates the real-time heating temperature difference ΔTz. Tz is compared with the standard heating temperature difference ΔTc. When ΔTz≤ΔTc, the step control module determines that the real-time heating temperature difference does not exceed the standard heating temperature difference, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc(1+ΔTq / Tb); when ΔTz>ΔTc, the step control module determines that the real-time heating temperature difference exceeds the standard heating temperature difference, and the step control module determines the real-time temperature of the tail end of the heated segment to adjust the stepping speed of the stepping device.

[0012] Optionally, the step control module is provided with a tail end standard temperature Te and a tail end standard temperature difference ΔTe. When the step control module determines that the real-time heating temperature difference exceeds the standard heating temperature difference, the step control module will calculate the tail end real-time temperature difference ΔTw according to the tail end standard temperature Te and the tail end real-time temperature Tw, ΔTw=|Te-Tw|, and the step control module compares the tail end real-time temperature difference ΔTw with the tail end standard temperature difference ΔTe. When ΔTw≤ΔTe, the step control module determines that the tail end real-time temperature difference does not exceed the tail end standard temperature difference, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc[1+(ΔTq / Tb)-(ΔTw / Te)]; when ΔTw>ΔTe, the step control module determines that the tail end real-time temperature difference exceeds the tail end standard temperature difference, the step control module compares the tail end real-time temperature with the tail end standard temperature, and adjusts the stepping speed of the stepping device according to the comparison result.

[0013] Optionally, when the step control module determines that the real-time temperature difference at the tail end exceeds the standard temperature difference at the tail end, the step control module compares the real-time temperature Tw at the tail end with the standard temperature Te at the tail end. When Tw<Te, the step control module determines that the real-time temperature at the tail end is lower than the standard temperature at the tail end, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc(1+ΔTw / Te); when Tw>Te, the step control module determines that the real-time temperature at the tail end is higher than the standard temperature at the tail end, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc(1+ΔTw / Te), and the step control module adjusts the heating temperature of the heating furnace according to the real-time temperature at the tail end and the real-time temperature at the front end of the heated section.

[0014] Optionally, the step control module is provided with an initial heating temperature Ta of the heating furnace. When the step control module determines that the real-time temperature of the tail end is higher than the standard temperature of the tail end, the step control module compares the real-time temperature difference ΔTq at the front end with the real-time temperature difference ΔTw at the tail end. When ΔTq≥ΔTw, the step control module determines that the real-time temperature difference at the front end is not lower than the real-time temperature difference at the tail end, and the step control module adjusts the initial heating temperature of the heating furnace to Ta', Ta'=Ta×(Tb / Tq); when ΔTq<ΔTw, the step control module determines that the real-time temperature difference at the front end is lower than the real-time temperature difference at the tail end, and the step control module adjusts the initial heating temperature of the heating furnace to Ta', Ta'=Ta×(Te / Tw).

[0015] Optionally, in step S4, the central control module is provided with the original cross-sectional area Si of the steel billet and the length Li of the raw material billet. After the steel billet is pre-cut and rolled with elliptical holes, the material shape detection device detects the real-time cross-sectional area So and the real-time length Lo of the raw material billet. The central control module calculates the elongation coefficient B of the steel billet according to the original cross-sectional area Si, the length Li of the raw material billet, the real-time cross-sectional area So and the real-time length Lo of the raw material billet, where B=Lo / Li×[(So×Lo) / (Si×Li)].

[0016] Optionally, the central control module is provided with a first preset elongation coefficient B1 and a second preset elongation coefficient B2, wherein B1<B2, and the central control module is also provided with a standard cutting and rolling speed Vb. After the rolled piece is pre-cut and rolled, the central control module calculates the elongation coefficient B of the rolled piece, and the central control module compares the elongation coefficient B of the rolled piece with the first preset elongation coefficient B1 and the second preset elongation coefficient B2. When B<B1, the central control module determines that the elongation coefficient of the billet is lower than the first preset elongation coefficient, and the central control module will be based on The real-time rolling temperature of the steel billet after pre-slitting and rolling adjusts the standard slitting and rolling speed Vb; when B1≤B≤B2, the central control module determines that the elongation coefficient of the steel billet is between the first preset elongation coefficient and the second preset elongation coefficient, and the central control module does not adjust the standard slitting and rolling speed Vb; when B>B2, the central control module determines that the elongation coefficient of the steel billet is higher than the second preset elongation coefficient, and the central control module adjusts the standard slitting and rolling speed to Vb', Vb'=Vb+Vb(B-B2) / B.

[0017] Optionally, a standard rolling temperature Th is provided in the central control module. When the central control module determines that the elongation coefficient of the rolled piece is lower than the first preset elongation coefficient, the surface temperature measuring device detects the real-time rolling temperature Ts of the rolled piece, and the central control module compares the real-time rolling temperature Ts of the rolled piece with the standard rolling temperature Th. When Ts<Th, the central control module determines that the real-time rolling temperature of the rolled piece is lower than the standard rolling temperature, and the central control module adjusts the standard cutting rolling speed to Vb', Vb'=Vb-Vb(B1-B) / B -Vb(Th-Ts) / Th; when Ts=Th, the central control module determines that the real-time rolling temperature of the rolled piece is equal to the standard rolling temperature, and the central control module adjusts the standard cutting rolling speed to Vb', Vb'=Vb-Vb(B1-B) / B; when Ts>Th, the central control module determines that the real-time rolling temperature of the rolled piece is higher than the standard rolling temperature, and the central control module adjusts the standard cutting rolling speed to Vb', Vb'=Vb-Vb(B1-B) / B+Vb(Ts-Th) / Th.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] The present invention ensures uniform heating of the steel billet by adjusting the stepping speed of the stepping device and the heating temperature of the heating furnace, avoiding local overheating or incomplete local heating that affects the rolling effect of the steel billet. At the same time, the slitting and rolling speed of the steel billet is adjusted in real time to optimize process control, and the appropriate stacking and pulling relationship of the finishing rolling is ensured through speed matching to prevent changes in the size of the finished product.

[0020] In addition, by adjusting the stepping speed of the stepping device, the exposure time of the high-temperature area of ​​the rolled piece can be controlled, thereby reducing the generation of iron oxide scale on the surface of the rolled piece, and preventing scraping of the rolled piece, steel extrusion, steel piling, steel sticking, etc. caused by the friction between the fine iron oxide scale on the surface of the rolled piece and the cutting knife. While ensuring the quality, the multi-line cutting and rolling process of small-size square steel is realized, thereby improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a flow chart of a square steel multi-wire slitting and rolling method described in this embodiment.

[0022] Figure 2 Schematic diagram of the K1-K6 pass profiles for three-wire slitting rolling of No. 10 square steel described in this embodiment. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] See also Figure 1 , which is a process flow chart of the square steel multi-line slitting and rolling method described in this embodiment. The present application can produce square steel by multi-line slitting and rolling, which is suitable for producing 10-20 mm square steel. This embodiment takes the three-line slitting and rolling of No. 10 square steel as an example, and includes the following steps:

[0025] Step S1, transfer the steel billet to the heating furnace for segmented heating through a stepping device. In this embodiment, a 150mm×150mm×12000mm steel billet is used. The real-time temperature of the heated section of the steel billet is detected by a temperature detection device arranged in the heating furnace. The step control module compares the real-time temperature of the heated section of the steel billet with the internally set standard temperature range, and adjusts the stepping speed of the stepping device and the heating temperature of the heating furnace according to the comparison result until the heating of the steel billet is completed.

[0026] Step S2, conveying the heated steel billet to a rough rolling mill through a roller table for rough rolling, wherein the rough rolling mill is provided with six rolling mills arranged alternately in horizontal and vertical positions;

[0027] Step S3, transferring the rough-rolled workpiece to the intermediate rolling mill through the guide groove for intermediate rolling, wherein the intermediate rolling mill is provided with six rolling mills arranged alternately in horizontal and vertical positions;

[0028] Step S4, transferring the rolled piece after intermediate rolling to a finishing mill through a guide groove or a roller table for finishing rolling, wherein the finishing mill is provided with six rolling mills arranged in a flat-vertical-flat-flat-flat-flat-flat arrangement. Figure 2 In the figure, from top to bottom, six finishing mills sequentially adopt flat rolls, box-shaped holes, pre-cut elliptical holes, cut diamond-shaped holes, diamond-shaped holes, and diamond-shaped holes. The rear end of the finishing mill with pre-cut elliptical holes is provided with a material type detection device for detecting the real-time cross-sectional area and real-time rolled length of the rolled piece after pre-cutting and rolling. The rear end of the finishing mill with pre-cutting arrangement is also provided with a surface temperature measuring device for detecting the real-time rolling temperature of the rolled piece after pre-cutting and rolling. A central control module is provided in the finishing mill group, and the original cross-sectional area of ​​the rolled piece and the length of the raw material billet are provided in the central control module. The central control module calculates the elongation coefficient of the rolled piece according to the real-time cross-sectional area, real-time material length, original cross-sectional area and length of the steel billet, and adjusts the cutting and rolling speed according to the elongation coefficient of the rolled piece and the real-time rolling temperature. The rolled piece passing through the cutting diamond-shaped holes is then rolled through the diamond-shaped holes and the diamond-shaped holes to complete the multi-line cutting and rolling process of square steel.

[0029] Specifically, in step S1, the step control module is provided with a front standard temperature Tb and a front standard temperature difference ΔTb, the hot delivery roller or the loading platform continuously transfers the billet to the interior of the heating furnace, the billet is in and out from the side, the front end of the billet in the moving direction in the heating furnace is used as the front end of the billet heating section, and the rear end of the billet in the moving direction in the heating furnace is used as the tail end of the billet heating section. Specifically, when the billet just enters a part of the heating furnace, the front end of its moving direction is used as the front end of the billet heating section, and the part of the billet located at the entrance of the heating furnace is used as the tail end of the billet heating section. When the billet passes through the heating furnace, the part of the billet at the outlet of the heating furnace is used as the front end of the billet heating section, and the part of the billet at the entrance of the heating furnace is used as the tail end of the billet heating section. When the tail end of the entire billet enters the heating furnace, the part of the billet at the outlet of the heating furnace is used as the front end of the billet heating section, and the tail end of the billet is used as the tail end of the billet heating section.

[0030] The temperature detection device detects the front end real-time temperature Tq of the front end of the heated section, and the step control module calculates the front end real-time temperature difference ΔTq of the front end of the billet according to the front end real-time temperature Tq and the front end standard temperature Tb, ΔTq=|Tb-Tq|, and the step control module compares the front end real-time temperature difference ΔTq with the front end standard temperature difference ΔTb. When ΔTq≤ΔTb, the step control module determines that the front end real-time temperature difference of the heated section does not exceed the front end standard temperature difference, and the step control module does not adjust the stepping speed of the stepping device; when ΔTq>ΔTb, the step control module determines that the front end real-time temperature difference of the heated section exceeds the front end standard temperature difference, and the step control module compares the front end real-time temperature with the front end standard temperature, and adjusts the stepping speed of the stepping device according to the comparison result.

[0031] Specifically, when the step control module determines that the front end real-time temperature difference of the heated section exceeds the front end standard temperature difference, the step control module compares the front end real-time temperature Tq with the front end standard temperature Tb. When Tq<Tb, the step control module determines that the front end real-time temperature of the heated section is lower than the front end standard temperature, and the step control module controls the stepping device to perform a stepping stop operation. The temperature detection device detects the front end real-time temperature Tq' of the heated section, and the step control module calculates the front end real-time temperature difference ΔTq' until ΔTq'≤ΔTb or Tq'>Tb, and the step control module controls the stepping device to stop the stepping stop operation; when Tq>Tb, the step control module determines that the front end real-time temperature of the heated section is higher than the front end standard temperature, and the temperature detection device detects the tail end real-time temperature of the tail end of the heated section of the steel billet, and the step control module adjusts the stepping speed of the stepping device according to the tail end real-time temperature.

[0032] Specifically, the step control module is provided with an initial step speed Rc of the step device, and the step control module is also provided with a standard heating temperature difference ΔTc. When the step control module determines that the front end real-time temperature of the heated section is higher than the front end standard temperature, the temperature detection device detects the tail end real-time temperature Tw of the tail end of the heated section of the steel billet, and the step control module calculates the real-time heating temperature difference ΔTz according to the front end real-time temperature Tq of the heated section and the tail end real-time temperature Tw, ΔTz=Tq-Tw, and the step control module calculates the real-time heating temperature difference ΔTz. ΔTz is compared with the standard heating temperature difference ΔTc. When ΔTz≤ΔTc, the step control module determines that the real-time heating temperature difference does not exceed the standard heating temperature difference, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc(1+ΔTq / Tb); when ΔTz>ΔTc, the step control module determines that the real-time heating temperature difference exceeds the standard heating temperature difference, and the step control module determines the real-time temperature of the tail end of the heated segment to adjust the stepping speed of the stepping device.

[0033] Specifically, the step control module is provided with a tail end standard temperature Te and a tail end standard temperature difference ΔTe. When the step control module determines that the real-time heating temperature difference exceeds the standard heating temperature difference, the step control module calculates the tail end real-time temperature difference ΔTw according to the tail end standard temperature Te and the tail end real-time temperature Tw, ΔTw=|Te-Tw|, and the step control module compares the tail end real-time temperature difference ΔTw with the tail end standard temperature difference ΔTe. When ΔTw≤ΔTe, the step control module determines that the tail end real-time temperature difference does not exceed the tail end standard temperature difference, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc[1+(ΔTq / Tb)-(ΔTw / Te)]; when ΔTw>ΔTe, the step control module determines that the tail end real-time temperature difference exceeds the tail end standard temperature difference, and the step control module compares the tail end real-time temperature with the tail end standard temperature, and adjusts the stepping speed of the stepping device according to the comparison result.

[0034] Specifically, when the step control module determines that the real-time temperature difference at the tail end exceeds the standard temperature difference at the tail end, the step control module compares the real-time temperature Tw at the tail end with the standard temperature Te at the tail end. When Tw<Te, the step control module determines that the real-time temperature at the tail end is lower than the standard temperature at the tail end, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc(1-ΔTw / Te); when Tw>Te, the step control module determines that the real-time temperature at the tail end is higher than the standard temperature at the tail end, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc(1+ΔTw / Te). The step control module adjusts the heating temperature of the heating furnace according to the real-time temperature at the tail end and the real-time temperature at the front end of the heated section.

[0035] Specifically, the step control module is provided with an initial heating temperature Ta of the heating furnace. When the step control module determines that the real-time temperature of the tail end is higher than the standard temperature of the tail end, the step control module compares the real-time temperature difference ΔTq at the front end with the real-time temperature difference ΔTw at the tail end. When ΔTq≥ΔTw, the step control module determines that the real-time temperature difference at the front end is not lower than the real-time temperature difference at the tail end, and the step control module adjusts the initial heating temperature of the heating furnace to Ta', Ta'=Ta×(Tb / Tq); when ΔTq<ΔTw, the step control module determines that the real-time temperature difference at the front end is lower than the real-time temperature difference at the tail end, and the step control module adjusts the initial heating temperature of the heating furnace to Ta', Ta'=Ta×(Te / Tw).

[0036] Specifically, in step S4, the central control module is provided with the original cross-sectional area Si of the steel billet and the length Li of the raw material billet. After the steel billet is pre-cut and rolled with elliptical holes, the material shape detection device detects the real-time cross-sectional area So and the real-time length Lo of the raw material billet. The central control module calculates the elongation coefficient B of the steel billet according to the original cross-sectional area Si, the length Li of the raw material billet, the real-time cross-sectional area So and the real-time length Lo of the raw material billet, where B=Lo / Li×[(So×Lo) / (Si×Li)].

[0037] Specifically, the central control module is provided with a first preset extension coefficient B1 and a second preset extension coefficient B2, wherein B1<B2, and the central control module is also provided with a standard cutting and rolling speed Vb. After the rolled piece is pre-cut and rolled, the central control module calculates the extension coefficient B of the rolled piece, and the central control module compares the extension coefficient B of the rolled piece with the first preset extension coefficient B1 and the second preset extension coefficient B2. When B<B1, the central control module determines that the extension coefficient of the billet is lower than the first preset extension coefficient, and the central control module compares the extension coefficient B of the rolled piece with the first preset extension coefficient B1 and the second preset extension coefficient B2. The standard slitting and rolling speed Vb is adjusted according to the real-time rolling temperature of the steel billet after pre-slitting and rolling; when B1≤B≤B2, the central control module determines that the elongation coefficient of the steel billet is between the first preset elongation coefficient and the second preset elongation coefficient, and the central control module does not adjust the standard slitting and rolling speed Vb; when B>B2, the central control module determines that the elongation coefficient of the steel billet is higher than the second preset elongation coefficient, and the central control module adjusts the standard slitting and rolling speed to Vb', Vb'=Vb+Vb(B-B2) / B.

[0038] Specifically, the central control module is provided with a standard rolling temperature Th. When the central control module determines that the elongation coefficient of the rolled piece is lower than the first preset elongation coefficient, the surface temperature measuring device detects the real-time rolling temperature Ts of the rolled piece, and the central control module compares the real-time rolling temperature Ts of the rolled piece with the standard rolling temperature Th. When Ts<Th, the central control module determines that the real-time rolling temperature of the rolled piece is lower than the standard rolling temperature, and the central control module adjusts the standard cutting rolling speed to Vb', Vb'=Vb-Vb(B1-B) / B-Vb(Th-Ts) / Th; when Ts=Th, the central control module determines that the real-time rolling temperature of the rolled piece is equal to the standard rolling temperature, and the central control module adjusts the standard cutting rolling speed to Vb', Vb'=Vb-Vb(B1-B) / B; when Ts>Th, the central control module determines that the real-time rolling temperature of the rolled piece is higher than the standard rolling temperature, and the central control module adjusts the standard cutting rolling speed to Vb', Vb'=Vb-Vb(B1-B) / B+Vb(Ts-Th) / Th.

[0039] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations shall fall within the protection scope of the claims of the present invention.

Claims

1. A square steel multi-wire slitting and rolling method, characterized in that: include, Step S1, transferring the steel billet to a heating furnace for segmented heating, detecting the real-time temperature of the heated section of the steel billet by a temperature detection device provided in the heating furnace, comparing the real-time temperature of the heated section of the steel billet with the internally set standard temperature range, and adjusting the stepping speed of the stepping device and the heating temperature of the heating furnace according to the comparison result until the heating of the steel billet is completed; Step S2, conveying the heated steel billet to a rough rolling mill group for rough rolling, wherein the rolling mills of the rough rolling mill group are arranged alternately in horizontal and vertical directions; Step S3, transferring the rough-rolled workpiece to an intermediate rolling mill for intermediate rolling, wherein the rolling mills of the intermediate rolling mill are arranged alternately in a horizontal and vertical manner; Step S4, transferring the rolled piece that has completed the intermediate rolling to the finishing mill group for finishing rolling, wherein the finishing mill group is provided with six rolling mills, which are arranged in a flat-vertical-flat-flat-flat-flat-flat manner, and the six finishing mills are arranged in sequence with flat rolls, box-shaped holes, pre-cut elliptical holes, cut diamond-square holes, diamond holes, and diamond-square holes. The rear end of the finishing mill arranged with pre-cut elliptical holes is provided with a material type detection device for detecting the real-time cross-sectional area and real-time rolled length of the rolled piece after pre-cutting rolling, and the rear end of the finishing mill arranged with pre-cutting is also provided with a surface temperature measuring device , used to detect the real-time rolling temperature of the rolled piece after pre-slitting and rolling. The finishing mill is provided with a central control module, in which the original cross-sectional area of ​​the rolled piece and the length of the raw material billet are provided. The central control module calculates the elongation coefficient of the rolled piece according to the real-time cross-sectional area of ​​the billet, the real-time rolled length, the original cross-sectional area and the length, and adjusts the slitting and rolling speed according to the elongation coefficient of the rolled piece and the real-time rolling temperature. The rolled piece that has passed through the slitting rhombus hole is then rolled through the rhombus hole and the rhombus square hole to complete the multi-line slitting and rolling of the square steel.

2. A square steel multi-wire slitting and rolling method according to claim 1, characterized in that: In step S1, the step control module is provided with a front end standard temperature Tb and a front end standard temperature difference ΔTb. The billet is in and out from the side. The front end of the billet in the moving direction in the heating furnace is used as the front end of the heated section of the billet. The rear end of the billet in the moving direction in the heating furnace is used as the rear end of the heated section of the billet. The temperature detection device detects the front end real-time temperature Tq of the front end of the heated section. The step control module calculates the front end real-time temperature difference ΔTq of the front end of the heated section according to the front end real-time temperature Tq and the front end standard temperature Tb. ΔTq=|Tb-Tq|, The step control module compares the front-end real-time temperature difference ΔTq with the front-end standard temperature difference ΔTb. When ΔTq≤ΔTb, the step control module determines that the front-end real-time temperature difference of the heated section does not exceed the front-end standard temperature difference, and the step control module does not adjust the stepping speed of the stepping device; when ΔTq>ΔTb, the step control module determines that the front-end real-time temperature difference of the heated section exceeds the front-end standard temperature difference, the step control module compares the front-end real-time temperature with the front-end standard temperature, and adjusts the stepping speed of the stepping device according to the comparison result.

3. A square steel multi-wire slitting and rolling method according to claim 2, characterized in that: When the step control module determines that the front end real-time temperature difference of the heated section exceeds the front end standard temperature difference, the step control module compares the front end real-time temperature Tq with the front end standard temperature Tb. When Tq<Tb, the step control module determines that the front end real-time temperature of the heated section is lower than the front end standard temperature, and the step control module controls the stepping device to perform a stepping stop operation. The temperature detection device detects the front end real-time temperature Tq' of the heated section, and the step control module calculates the front end real-time temperature difference ΔTq' until ΔTq'≤ΔTb or Tq'>Tb, and the step control module controls the stepping device to stop the stepping stop operation; when Tq>Tb, the step control module determines that the front end real-time temperature of the heated section is higher than the front end standard temperature, and the temperature detection device detects the tail end real-time temperature of the tail end of the heated section, and the step control module adjusts the stepping speed of the stepping device according to the tail end real-time temperature.

4. A square steel multi-wire slitting and rolling method according to claim 3, characterized in that: The step control module is provided with an initial step speed Rc of the stepping device, and is also provided with a standard heating temperature difference ΔTc. When the step control module determines that the front end real-time temperature of the heated segment is higher than the front end standard temperature, the temperature detection device will detect the tail end real-time temperature Tw of the tail end of the heated segment, and the step control module calculates the real-time heating temperature difference ΔTz according to the front end real-time temperature Tq and the tail end real-time temperature Tw of the heated segment, ΔTz=Tq-Tw, and the step control module compares the real-time heating temperature difference ΔTz with the standard heating temperature difference ΔTc. When ΔTz≤ΔTc, the step control module determines that the real-time heating temperature difference does not exceed the standard heating temperature difference, and the step control module adjusts the initial step speed of the stepping device to Rc', Rc'=Rc(1+ΔTq / Tb); when ΔTz>ΔTc, the step control module determines that the real-time heating temperature difference exceeds the standard heating temperature difference, and the step control module determines the tail end real-time temperature of the heated segment to adjust the step speed of the stepping device.

5. A square steel multi-wire slitting and rolling method according to claim 4, characterized in that: The step control module is provided with a tail end standard temperature Te and a tail end standard temperature difference ΔTe. When the step control module determines that the real-time heating temperature difference exceeds the standard heating temperature difference, the step control module calculates the tail end real-time temperature difference ΔTw according to the tail end standard temperature Te and the tail end real-time temperature Tw, ΔTw=|Te-Tw|, and the step control module compares the tail end real-time temperature difference ΔTw with the tail end standard temperature difference ΔTe. When ΔTw≤ΔTe, the step control module determines that the tail end real-time temperature difference does not exceed the tail end standard temperature difference, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc[1+(ΔTq / Tb)-(ΔTw / Te)]; when ΔTw>ΔTe, the step control module determines that the tail end real-time temperature difference exceeds the tail end standard temperature difference, and the step control module compares the tail end real-time temperature with the tail end standard temperature, and adjusts the stepping speed of the stepping device according to the comparison result.

6. A square steel multi-wire slitting and rolling method according to claim 5, characterized in that: When the step control module determines that the real-time temperature difference at the tail end exceeds the standard temperature difference at the tail end, the step control module compares the real-time temperature Tw at the tail end with the standard temperature Te at the tail end. When Tw<Te, the step control module determines that the real-time temperature at the tail end is lower than the standard temperature at the tail end, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc(1-ΔTw / Te); when Tw>Te, the step control module determines that the real-time temperature at the tail end is higher than the standard temperature at the tail end, and the step control module adjusts the initial stepping speed of the stepping device to Rc', Rc'=Rc(1+ΔTw / Te). The step control module adjusts the heating temperature of the heating furnace according to the real-time temperature at the tail end and the real-time temperature at the front end of the heated section.

7. A square steel multi-wire slitting and rolling method according to claim 6, characterized in that: The step control module is provided with an initial heating temperature Ta of the heating furnace. When the step control module determines that the real-time temperature of the tail end is higher than the standard temperature of the tail end, the step control module compares the real-time temperature difference ΔTq at the front end with the real-time temperature difference ΔTw at the tail end. When ΔTq≥ΔTw, the step control module determines that the real-time temperature difference at the front end is not lower than the real-time temperature difference at the tail end, and the step control module adjusts the initial heating temperature of the heating furnace to Ta', where Ta'=Ta×(Tb / Tq); when ΔTq<ΔTw, the step control module determines that the real-time temperature difference at the front end is lower than the real-time temperature difference at the tail end, and the step control module adjusts the initial heating temperature of the heating furnace to Ta', where Ta'=Ta×(Te / Tw).

8. The square steel multi-wire slitting and rolling method according to claim 1, characterized in that: In step S4, the central control module is provided with the original cross-sectional area Si of the steel billet and the length Li of the raw material billet. After the steel billet is pre-cut and rolled with elliptical holes, the material type detection device detects the real-time cross-sectional area So and the real-time length Lo of the raw material billet. The central control module calculates the elongation coefficient B of the steel billet according to the original cross-sectional area Si, the length Li of the raw material billet, the real-time cross-sectional area So and the real-time length Lo of the raw material billet, where B=Lo / Li×[(So×Lo) / (Si×Li)].

9. A square steel multi-wire slitting and rolling method according to claim 8, characterized in that: The central control module is provided with a first preset extension coefficient B1 and a second preset extension coefficient B2, wherein B1<B2. The central control module is also provided with a standard cutting and rolling speed Vb. After the rolled piece is pre-cut and rolled, the central control module calculates the extension coefficient B of the rolled piece. The central control module compares the extension coefficient B of the rolled piece with the first preset extension coefficient B1 and the second preset extension coefficient B2. When B<B1, the central control module determines that the extension coefficient of the billet is lower than the first preset extension coefficient. The central control module will The real-time rolling temperature of the steel billet after pre-slitting and rolling adjusts the standard slitting and rolling speed Vb; when B1≤B≤B2, the central control module determines that the elongation coefficient of the steel billet is between the first preset elongation coefficient and the second preset elongation coefficient, and the central control module does not adjust the standard slitting and rolling speed Vb; when B>B2, the central control module determines that the elongation coefficient of the steel billet is higher than the second preset elongation coefficient, and the central control module adjusts the standard slitting and rolling speed to Vb', Vb'=Vb+Vb(B-B2) / B.

10. A square steel multi-wire slitting and rolling method according to claim 9, characterized in that: The central control module is provided with a standard rolling temperature Th. When the central control module determines that the elongation coefficient of the rolled piece is lower than the first preset elongation coefficient, the surface temperature measuring device detects the real-time rolling temperature Ts of the rolled piece, and the central control module compares the real-time rolling temperature Ts of the rolled piece with the standard rolling temperature Th. When Ts<Th, the central control module determines that the real-time rolling temperature of the rolled piece is lower than the standard rolling temperature, and the central control module adjusts the standard cutting rolling speed to Vb', Vb'=Vb-Vb(B1-B) / B-V b(Th-Ts) / Th; when Ts=Th, the central control module determines that the real-time rolling temperature of the rolled piece is equal to the standard rolling temperature, and the central control module adjusts the standard cutting rolling speed to Vb', Vb'=Vb-Vb(B1-B) / B; when Ts>Th, the central control module determines that the real-time rolling temperature of the rolled piece is higher than the standard rolling temperature, and the central control module adjusts the standard cutting rolling speed to Vb', Vb'=Vb-Vb(B1-B) / B+Vb(Ts-Th) / Th.

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