CN111872149B - ESP-based dynamic variable rule slab performance gradient distribution forming method - Google Patents

ESP-based dynamic variable rule slab performance gradient distribution forming method Download PDF

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Publication number
CN111872149B
CN111872149B CN202010681750.5A CN202010681750A CN111872149B CN 111872149 B CN111872149 B CN 111872149B CN 202010681750 A CN202010681750 A CN 202010681750A CN 111872149 B CN111872149 B CN 111872149B
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plate blank
rolling
variable
thickness
temperature
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CN111872149A (en
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彭艳
刘才溢
杨冲
杨彦博
刘洋
崔金星
郭贺松
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Yanshan University
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Yanshan University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21CMANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/02Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62Quenching devices
    • C21D1/673Quenching devices for die quenching
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B2001/225Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B2261/00Product parameters
    • B21B2261/20Temperature
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/001Austenite
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/008Martensite

Abstract

The invention discloses a method for forming a plate blank with performance gradient distribution based on ESP dynamic variable rule, which belongs to the field of rolling and deep processing of steel materials, and realizes online non-stop roll change rolling of a variable-thickness plate blank through a '5 + 1' dynamic variable rule strategy of a finishing mill group, and is cascaded with a stamping quenching technology after a laminar cooling process, so that the integration of upstream rolling and downstream deep processing industries is realized, the short-flow-compact production flow combining rolling and deep processing is realized, and a stamping quenching part with performance variable gradient characteristics can be produced The method has important significance in the aspects of expanding the advantage supply, optimizing the capacity layout and the like.

Description

ESP-based dynamic variable rule slab performance gradient distribution forming method
Technical Field
The invention relates to the field of steel material rolling and deep processing, in particular to an ESP (electronic stability program) dynamic variable rule based slab performance gradient distribution forming method.
Background
The automobile industry is an important strut industry of national economy, high-strength steel plays an important role in automobile lightweight and improvement of automobile safety performance, and is widely applied to automobile bodies, along with continuous development of scientific technology, a large number of collision tests prove that the higher the strength of automobile body parts is, the more favorable the lightweight and the collision resistance is, the non-uniform distribution of loads borne by the automobile parts in a service state is not, in order to ensure the integral rigidity and the collision energy absorption effect of the automobile body, the material performance requirements of different parts are required to be matched with the use requirements, namely, the different corresponding performances of the loads borne by various regions in the automobile parts and the use requirements are also different, so that the performance gradient of final parts designed according to the distribution form of the loads becomes the pursuit target of automobile anti-collision core parts, and a flexible rolling technology developed along with the weight reduction and the optimization of the structure of the automobile can produce slabs with non-uniform, the method has obvious advantages in the aspect of optimizing the structure of the vehicle body, and different from the traditional equal-thickness plate, the variable-thickness plate has good comprehensive mechanical properties because the section shape of the variable-thickness plate in the rolling direction is continuously changed, and in the subsequent forming process, the mechanical properties of different areas are different because the plate blank thickness is different.
The existing variable thickness plate forming and manufacturing technology is that an upstream rolling process and a downstream deep processing manufacturing process belong to different workshops or production areas, the production flow of the upstream rolling process is continuous casting → a rough rolling unit → pendulum type shear → induction heating → a descaling box → a finishing rolling unit → laminar cooling → shear → coiling, a coiler coils high-strength steel with waste heat, and then the produced variable thickness plate blank is transported to the downstream deep processing manufacturing process through uncoiling → variable thickness rolling → variable thickness plate blank, is processed into a variable thickness press quenching part and then transported to a vehicle manufacturing enterprise for assembly, in the upstream rolling process, the production efficiency of the enterprise is influenced due to roll changing caused by roll wear, and the production cost is higher due to the separation of the technical equipment process of the upstream rolling process and the downstream deep processing manufacturing process, and a large amount of waste energy resources are wasted during the production and manufacturing process of the press quenching part from raw materials to products, the rolling and deep processing production of steel and iron materials belongs to the high energy consumption industry, so the development and research of the high-efficiency rolling and deep processing production flow which has the center of shortening the process flow, accelerating the production rhythm, realizing continuous production and improving the production efficiency has important significance.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for forming the gradient distribution of the performance of a plate blank based on ESP dynamic variable rule, which breaks the barriers that the traditional upstream rolling process and the downstream deep processing manufacturing process belong to different workshops or production areas, promotes the collaborative innovation of the rolling and deep processing technologies, changes the mutually independent production processes of upstream enterprises and downstream enterprises, and realizes the integration of upstream and downstream industries.
The technical scheme of the invention is as follows:
specifically, the invention provides an ESP dynamic variable rule based slab performance gradient distribution forming method, and the production of the slab comprises the following steps:
continuous casting → roughing mill group → pendulum shear → induction heating → descaling box → finishing mill group carries out dynamic variation procedure finish rolling → laminar cooling → shearing → induction heating → heat preservation → press quenching → laser cutting → shot blasting;
the temperature of the plate blank after continuous casting treatment is 1450 ℃, the temperature of the plate blank is reduced to 980 +/-20 ℃ after the rough rolling with large reduction of a rough rolling unit, the temperature of the plate blank is increased to 1150 +/-30 ℃ after induction heating treatment, the temperature of the plate blank is reduced to 880 +/-20 ℃ after the finish rolling treatment of a finishing rolling unit, the temperature of the plate blank is reduced to 600 +/-30 ℃ after laminar cooling, then the temperature is increased to 900 +/-20 ℃ after induction heating, the temperature is kept for 200-350 seconds to ensure that the microstructure of the plate blank is converted into austenite, then the plate blank is subjected to stamping quenching, the cooling speed of a stamping quenching die is 60 +/-10 ℃/s, and the cooling temperature is;
and carrying out laminar cooling to obtain a variable-thickness plate blank, wherein the variable-thickness plate blank comprises a thick area and a thin area, after the variable-thickness plate blank is subjected to a stamping quenching process, the cooling speeds of the thick area and the thin area are both greater than the critical cooling speed of martensite transformation, the microstructure of the variable-thickness plate blank is a martensite structure, and the tensile strength of the variable-thickness plate blank is subjected to gradient distribution from 1410-1500 MPa.
Preferably, the finishing mill group comprises five conventional frame rolling mills and a standby rolling mill, when in normal rolling production, the five frame rolling mill is put into use, in a working state, the last rolling mill in the five frame rolling mill enables the geometric shape of a rolled piece along the rolling direction to be continuously changed through roll gap adjustment, a variable-thickness plate blank is produced, when a roller of one of the five frame rolling mills is seriously worn in the working state, the standby rolling mill is pressed down to be put into work, and the roller worn in the roller mill is lifted to exit the rolling production.
Preferably, the roughing mill train is a 3 stand high reduction roughing mill.
Preferably, in the stamping and quenching process, the geometric shape of the die is matched with that of the variable-thickness plate blank, and a cooling channel is arranged inside the die and used for quenching and cooling the plate blank.
Preferably, the finishing mill group always keeps five frames for production in a working state, and the frame rollers produce variable-thickness plate blanks through a roller gap adjusting technology.
Preferably, the thickness of the variable-thickness slab is 1.6-2 mm, wherein the thickness of the thick area is 2mm, the thickness of the thin area is 1.6mm, and the length of the transition area is 40 mm.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, through a '5 + 1' dynamic regulation changing technology of a finishing mill group, the variable-thickness plate blank can be produced by changing rolls on line without stopping, and is cascaded with a stamping quenching technology after a laminar cooling process, so that the integration of upstream rolling and downstream deep processing industries is realized, the 'short flow-near net shape' industrialization direction of 'rolling-deep processing' combination is realized, and the stamping quenching parts with the variable-gradient performance can be produced in batches.
(2) The invention realizes the online non-stop roll change of the finishing mill, meets the small-batch large-scale personalized customization conditions, fully releases the process potential of the strip tandem rolling equipment, expands the product range of enterprises and improves the production efficiency of the enterprises.
(3) The invention realizes the integrated production from metallurgical raw materials to products, saves the transportation cost of intermediate links, can effectively utilize the residual energy of the rolling process, obviously shortens the whole manufacturing process of deep processing of the plate blank, promotes the high-quality development of the rolling and deep processing industries, and has important significance in the aspects of promoting the green development of the field of the rolling and deep processing industries, expanding the advantage supply, optimizing the productivity layout and the like.
Drawings
FIG. 1 is a process flow diagram of the ESP dynamic variable rule-based slab performance gradient distribution forming method of the invention;
FIG. 2 is a process diagram for temperature control according to the present invention; and
figure 3 is a schematic structural view of a variable thickness slab in an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The invention provides a method for forming a plate blank based on ESP dynamic variable rule performance gradient distribution, which comprises the steps of carrying out laminar cooling treatment on a variable-thickness plate blank, then directly shearing the variable-thickness plate blank into a preset size, carrying out stamping quenching treatment after the variable-thickness plate blank meets the stamping quenching target temperature through induction heating, and manufacturing a stamping quenching part with variable-performance gradient characteristics.
The generation process of the variable-thickness plate blank comprises the following steps:
continuous casting → roughing mill group → pendulum shear → induction heating → descaling box → 5+1 dynamic regulation finishing mill group → laminar cooling → shear → induction heating → heat preservation → press quenching → laser cutting → shot blasting.
Preferably, the finishing mill group is arranged on the basis of a traditional five-stand rolling mill, a rolling mill is additionally arranged as a standby rolling mill, the five-stand rolling mill is put into use during normal rolling production, the last rolling mill in the five-stand rolling mill in a working state enables the geometric shape of a rolled piece to be continuously changed along the rolling direction through a roll gap adjusting technology to produce a variable-thickness slab, when the roller of a certain rolling mill in the five-stand rolling mill in the working state is seriously worn, a '5 + 1' dynamic change rule strategy is started, the standby rolling mill is put into operation under the pressing down, the roller of the roller-worn rolling mill is lifted to exit the rolling production, and online non-.
The temperature control process comprises the following steps: the temperature of the plate blank after continuous casting treatment is 1450 ℃, the temperature is reduced to 980 +/-20 ℃ after rough rolling with large reduction, the temperature of induction heating treatment is increased to 1150 +/-30 ℃, the temperature is reduced to 880 +/-20 ℃ after finish rolling treatment by a finishing mill group, the temperature is reduced to 600 +/-30 ℃ after laminar cooling, then the temperature is increased to 900 +/-20 ℃ after induction heating, the temperature is kept for 200-350 seconds to ensure that the microstructure of the plate blank is converted into austenite, then stamping quenching is carried out, and the cooling speed of a stamping quenching die is 60 +/-10 ℃/s and the temperature is cooled to 150 +/-50 ℃.
Preferably, the roughing mill train is a 3 stand high reduction roughing mill.
Preferably, in the stamping and quenching process, the geometric shape of the die is matched with that of the variable-thickness plate blank, and the cooling channel is arranged inside the die, so that the plate blank is quenched and cooled.
Preferably, the finishing mill group in the working state always keeps five frames for production, and finally, the frame roller keeps producing the variable-thickness plate blank through a roller gap adjusting technology.
Preferably, as shown in fig. 3, the variable thickness slab finished by the "5 + 1" dynamic variable schedule finishing mill group comprises a thick region 1, a thin region 3 and a transition region 2. The thickness of the variable-thickness slab is 1.6-2 mm, wherein the thickness of the thick area is 2mm, the thickness of the thin area is 1.6mm, and the length of the transition area is 40 mm.
Preferably, after the variable-thickness plate blank is subjected to the stamping and quenching process, the cooling speed of the thickness and the cooling speed of the thin area are both greater than the critical cooling speed of martensite transformation, the microstructure of the plate blank is a martensite structure, and the tensile strength of the plate blank is distributed in a gradient manner from 1410 MPa to 1500 MPa.
In the embodiment of the invention, the selected raw material is boron steel, wherein the raw material comprises the following components in percentage by mass: 0.225C, 0.256Si, 1.24Mn, 0.03Al, 0.163Cr and 0.003B (in wt.%).
Molten steel formed by smelting the raw materials is manufactured into a high-strength slab through a process flow schematic diagram shown in figure 1.
The specific process comprises the following steps:
continuous casting → rough rolling mill group → pendulum shear → induction heating → descaling box → 5+1 dynamic regulation finishing mill group → laminar cooling → shear → induction heating → heat preservation → press quenching → laser cutting → shot blasting, wherein the finishing mill group is based on the basis of traditional five-stand arrangement, adds a rolling mill as a standby rolling mill, and during normal rolling production, the five-stand rolling mill is put into use, and the last rolling mill in the five-stand rolling mill in the working state enables the geometric shape of the rolled piece to be continuously changed along the rolling direction through a roll gap adjusting technology, so as to produce the variable-thickness plate blank.
When the roller of a certain rolling mill in the five-stand rolling mill is seriously worn in a working state, a '5 + 1' dynamic regulation strategy is started, the standby rolling mill is pressed down to be put into work, the roller of the rolling mill with the worn roller is lifted to exit rolling production, and online non-stop roller change is realized, wherein the dynamic regulation strategy comprises dynamic roller gap adjustment, speed adjustment and the like.
The temperature of the plate blank after continuous casting treatment is 1450 ℃, the temperature is reduced to 980 +/-20 ℃ after rough rolling with large reduction, the temperature is increased to 1150 +/-30 ℃, the temperature is reduced to 880 +/-20 ℃ after finish rolling treatment by a finishing mill group, the temperature is reduced to 600 +/-30 ℃ after laminar cooling, the temperature is increased to 900 +/-20 ℃ after induction heating, the temperature is kept for 200-350 seconds to ensure that the microstructure of the plate blank is converted into austenite, then stamping quenching is carried out, the cooling speed of a stamping quenching die is 60 +/-10 ℃/s, the cooling is carried out to 150 +/-50 ℃, the rough rolling mill group is a 3-stand large reduction rough rolling mill, the finishing mill group is a '5 + 1' dynamic variable schedule technology 6-stand finishing mill, in the stamping quenching process, the geometric shape of the die is matched with the variable-thickness plate blank, a cooling channel is arranged in the die, further quenching cooling is carried out, the working state of the finishing mill group is kept for producing the plate blank with five stands all, and finally, keeping the thickness of the produced variable-thickness plate blank to be 1.6-2 mm and the length of a thickness transition region to be 40mm by a frame roller through a roller gap adjusting technology, wherein after the variable-thickness plate blank is subjected to a stamping quenching process, the cooling speed of the thickness and the cooling speed of the thin region are both greater than the critical cooling speed of martensite transformation, the microstructure of the plate blank is a martensite structure, and the tensile strength of the plate blank is distributed in a gradient manner from 1410-1500 MPa.
The present invention is described in detail below with reference to specific examples:
example 1
In the rolling process of the embodiment, the temperature of a thin slab subjected to continuous casting treatment is 1450 ℃, the temperature is reduced to 960 ℃ after rough rolling treatment of a rough rolling mill set, the temperature is increased to 1120 ℃ after induction heating treatment, the temperature is reduced to 860 ℃ after finish rolling treatment of a finishing rolling mill set, and the temperature is reduced to 570 ℃ after laminar cooling.
When the roller of one of the five-stand rolling mill is seriously worn in a working state, a '5 + 1' dynamic regulation strategy is started, the standby rolling mill is pressed down to be put into operation, the roller of the roller-worn rolling mill is lifted to exit rolling production, the roller change without stopping on line is realized, and the last rolling mill continuously changes the geometric shape of a rolled piece along the rolling direction through a roller gap adjusting technology to produce a variable-thickness plate blank.
And (3) directly carrying out deep processing treatment on the plate blank after the laminar cooling treatment to obtain a variable-thickness plate blank after the laminar cooling treatment, then directly shearing the variable-thickness plate blank into a preset size, raising the temperature to 880 ℃ through induction heating, and preserving the temperature for 200-350 seconds to ensure that the microstructure of the plate blank is converted into austenite.
The method comprises the steps that a heat-insulated high-temperature plate blank is transferred into a hot stamping die through a high-temperature intelligent manipulator to be subjected to hot stamping, in the stamping quenching treatment, the cooling speed of the stamping quenching die is set to be 50 ℃/s, the temperature is cooled to 100 ℃, a good cooling effect can be achieved for the variable-thickness plate blank, the variable-thickness plate blank can be rapidly cooled in the deformation process, the cooling speed of the thickness and the cooling speed of the thin area are both greater than the critical cooling speed of martensite transformation, the microstructure of the plate blank is a martensite structure, the tensile strength of the plate blank is distributed from 1410-1500 MPa in a gradient mode, a workpiece formed in the stamping quenching die is subjected to laser cutting and shot blasting post-treatment, the size requirement of the formed workpiece is met, and the surface.
Through the process, the integrated production of the formed plate blank from raw materials to products is realized, and the parts subjected to laser cutting and shot blasting are packaged into finished products and conveyed to various automobile production enterprises.
Example 2
In the rolling process, the temperature of a thin slab subjected to continuous casting treatment is 1450 ℃, the temperature is reduced to 980 ℃ after the thin slab is subjected to rough rolling treatment by a rough rolling unit, the temperature is increased to 1150 ℃ after the thin slab is subjected to induction heating treatment, the temperature is reduced to 880 ℃ after the thin slab is subjected to finish rolling treatment by a finishing rolling unit, and the temperature is reduced to 600 ℃ after laminar cooling.
When the roller of a certain rolling mill in the five-stand rolling mill in the working state is seriously worn, a '5 + 1' dynamic regulation strategy is started, the standby rolling mill is pressed down to be put into work, the roller of the roller worn is lifted to quit rolling production, the roller change without stopping on line is realized, and the last rolling mill continuously changes the geometric shape of a rolled piece along the rolling direction through a roller gap adjusting technology to produce a variable-thickness plate blank.
And (3) directly carrying out deep processing treatment on the plate blank after the laminar cooling treatment to obtain a variable-thickness plate blank after the laminar cooling treatment, then directly shearing the variable-thickness plate blank into a preset size, raising the temperature to 900 ℃ through induction heating, and preserving the temperature for 200-350 seconds to ensure that the microstructure of the plate blank is converted into austenite.
The method comprises the steps that a heat-insulated high-temperature plate blank is transferred into a hot stamping die through a high-temperature intelligent manipulator to be subjected to hot stamping, in the stamping quenching treatment, the cooling speed of the stamping quenching die is set to be 60 ℃/s, the temperature is cooled to 150 ℃, a good cooling effect can be achieved for the variable-thickness plate blank, the variable-thickness plate blank can be rapidly cooled in the deformation process, the cooling speed of the thickness and the cooling speed of the thin area are both greater than the critical cooling speed of martensite transformation, the microstructure of the plate blank is a martensite structure, the tensile strength of the plate blank is distributed from 1410-1500 MPa in a gradient mode, a workpiece formed in the stamping quenching die is subjected to laser cutting and shot blasting post-treatment, the size requirement of the formed workpiece is met, and the surface.
Through the process, the integrated production of the formed plate blank from raw materials to products is realized, and the parts subjected to laser cutting and shot blasting are packaged into finished products and conveyed to various automobile production enterprises.
Example 3
In the rolling process of the embodiment, the temperature of a thin slab subjected to continuous casting treatment is 1450 ℃, the temperature is reduced to 1000 ℃ after rough rolling treatment of a rough rolling mill set, the temperature is increased to 1180 ℃ after induction heating treatment, the temperature is reduced to 900 ℃ after finish rolling treatment of a finishing rolling mill set, and the temperature is reduced to 630 ℃ after laminar cooling.
When the roller of a certain rolling mill in the five-stand rolling mill in the working state is seriously worn, a '5 + 1' dynamic regulation strategy is started, the standby rolling mill is pressed down to be put into work, the roller of the roller worn is lifted to quit rolling production, the roller change without stopping on line is realized, and the last rolling mill continuously changes the geometric shape of a rolled piece along the rolling direction through a roller gap adjusting technology to produce a variable-thickness plate blank.
And (3) directly carrying out deep processing treatment on the plate blank after the laminar cooling treatment to obtain a variable-thickness plate blank after the laminar cooling treatment, then directly shearing the variable-thickness plate blank into a preset size, raising the temperature to 920 ℃ through induction heating, and preserving the temperature for 200-350 seconds to ensure that the microstructure of the plate blank is transformed into austenite.
The method comprises the steps that a heat-insulated high-temperature plate blank is transferred into a hot stamping die through a high-temperature intelligent manipulator to be subjected to hot stamping, in the stamping quenching treatment, the cooling speed of the stamping quenching die is set to be 70 ℃/s, the temperature is cooled to 200 ℃, a good cooling effect can be achieved for the variable-thickness plate blank, the variable-thickness plate blank can be rapidly cooled in the deformation process, the cooling speed of the thickness and the cooling speed of the thin area are both greater than the critical cooling speed of martensite transformation, the microstructure of the plate blank is a martensite structure, the tensile strength of the plate blank is distributed from 1410-1500 MPa in a gradient mode, a workpiece formed in the stamping quenching die is subjected to laser cutting and shot blasting post-treatment, the size requirement of the formed workpiece is met, and the surface.
Through the process, the integrated production of the formed plate blank from raw materials to products is realized, and the parts subjected to laser cutting and shot blasting are packaged into finished products and conveyed to various automobile production enterprises.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims (1)

1. An ESP dynamic variable rule based slab performance gradient distribution forming method is characterized in that: the manufacturing of the slab comprises the following steps:
continuous casting → roughing mill group → pendulum shear → induction heating → descaling box → finishing mill group carries out dynamic variation procedure finish rolling → laminar cooling → shearing → induction heating → heat preservation → press quenching → laser cutting → shot blasting;
the temperature of the plate blank after continuous casting treatment is 1450 ℃, the temperature of the plate blank is reduced to 980 +/-20 ℃ after the rough rolling of the rough rolling unit under large reduction, the temperature of the plate blank is increased to 1150 +/-30 ℃ after induction heating treatment, the temperature of the plate blank is reduced to 880 +/-20 ℃ after the finish rolling of the finishing rolling unit, the temperature of the plate blank is reduced to 600 +/-30 ℃ after laminar cooling, the temperature of the plate blank is increased to 900 +/-20 ℃ after induction heating, the temperature is kept for 200-350 seconds to ensure that the microstructure of the plate blank is converted into austenite, then stamping quenching is carried out, the cooling speed of a stamping quenching die is 60 +/-10 ℃/s, and the cooling temperature is 150;
obtaining a variable-thickness plate blank after laminar cooling, wherein the variable-thickness plate blank comprises a thick area, a thin area and a transition area, after the variable-thickness plate blank is subjected to a stamping quenching process, the cooling speeds of the thick area and the thin area are both greater than the critical cooling speed of martensite transformation, the microstructure of the variable-thickness plate blank is a martensite structure, and the tensile strength of the variable-thickness plate blank is distributed in a gradient manner from 1410-1500 MPa;
the finishing mill group comprises five conventional frame rolling mills and a standby rolling mill, the five frame rolling mills are put into use during normal rolling production, the last rolling mill in the five frame rolling mills enables the geometric shape of a rolled piece along the rolling direction to be continuously changed through roll gap adjustment in a working state, a variable-thickness slab is produced, when a roller of one of the five frame rolling mills is seriously worn in the working state, the standby rolling mill is pressed down to be put into work, the roller of the roller wearing rolling mill is lifted to exit rolling production, and the roughing mill group is a three-frame high-reduction roughing mill;
in the stamping and quenching process, the geometric shape of a die is matched with a variable-thickness plate blank, and a cooling channel is arranged in the die and used for quenching and cooling the plate blank;
the finishing mill group always keeps five frames for production in a working state, and the frame roller produces the variable-thickness plate blank through a roller gap adjusting technology;
the thickness range of the variable-thickness slab is 1.6-2 mm, wherein the thickness of the thick area is 2mm, the thickness of the thin area is 1.6mm, and the length of the transition area is 40 mm.
CN202010681750.5A 2020-07-15 2020-07-15 ESP-based dynamic variable rule slab performance gradient distribution forming method Active CN111872149B (en)

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Application Number Priority Date Filing Date Title
CN202010681750.5A CN111872149B (en) 2020-07-15 2020-07-15 ESP-based dynamic variable rule slab performance gradient distribution forming method

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Application Number Priority Date Filing Date Title
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Publication Number Publication Date
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CN111872149B true CN111872149B (en) 2021-02-09

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104762460A (en) * 2015-03-12 2015-07-08 燕山大学 Rolling and deep-processing short-process integrated manufacturing method of high-strength steel automobile sheet
CN105945071A (en) * 2016-06-24 2016-09-21 燕山大学 On-line roller change device and method for finish rolling unit in endless strip production
CN106552831A (en) * 2016-06-28 2017-04-05 东北大学 A kind of manufacture method of Thin Specs hot-strip
CN109201758A (en) * 2018-11-13 2019-01-15 燕山大学 Mm finishing mill unit and milling method in a kind of ESP endless rolling
CN109433825A (en) * 2018-11-13 2019-03-08 燕山大学 The method and high-strength steel sheet of a kind of short route production high-strength steel sheet and its application

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104762460A (en) * 2015-03-12 2015-07-08 燕山大学 Rolling and deep-processing short-process integrated manufacturing method of high-strength steel automobile sheet
CN105945071A (en) * 2016-06-24 2016-09-21 燕山大学 On-line roller change device and method for finish rolling unit in endless strip production
CN106552831A (en) * 2016-06-28 2017-04-05 东北大学 A kind of manufacture method of Thin Specs hot-strip
CN109201758A (en) * 2018-11-13 2019-01-15 燕山大学 Mm finishing mill unit and milling method in a kind of ESP endless rolling
CN109433825A (en) * 2018-11-13 2019-03-08 燕山大学 The method and high-strength steel sheet of a kind of short route production high-strength steel sheet and its application

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