CN102974683B - Ultrahigh strength open section hot roll forming process and device - Google Patents
Ultrahigh strength open section hot roll forming process and device Download PDFInfo
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- CN102974683B CN102974683B CN201210525230.0A CN201210525230A CN102974683B CN 102974683 B CN102974683 B CN 102974683B CN 201210525230 A CN201210525230 A CN 201210525230A CN 102974683 B CN102974683 B CN 102974683B
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Abstract
The invention relates to an ultrahigh strength open section hot roll forming process and an ultrahigh strength open section hot roll forming device. The ultrahigh strength open section hot roll forming process comprises the following steps of: 1, uncoiling and cutting; 2, forming, i.e. transferring a sheet metal into roll forming equipment and preforming the sheet metal into a semifinished product open section under the condition of room temperature; 3, heating, i.e. heating the section to a temperature of 800 to 1,100 DEG C and preserving heat for 2min to 6min; and 4, stamping and sizing, i.e. rapidly transferring the section into a stamping die to carry out shaping and cooling, totally coating the section with a shaping die, loading the shaping die by 3 to 10 stamping racks, utilizing the die to shape the semifinished product open section into a finished product of which the size accords with the requirements after loading the shaping die, and when shaping, filling a circulating cooling medium in a passage below the surface of the die, utilizing the temperature difference of the die and the section to quench the high temperature section and cooling the open section in a pressure maintaining state to enable a microstructure of the section to be rapidly transformed from an austenite structure at a high temperature into a martensitic structure at normal temperature from an austenite structure at a high temperature so as to obtain a high strength section.
Description
Technical field
The present invention relates to the preparation of superhigh intensity section bar, particularly a kind of superhigh intensity opening profile hot roll bending forming technology and device.
Background technology
Boron steel heat forming technology process is for first initial state being organized as to ferrite and pearlite, and tensile strength is about the boron steel plate heating austenitizing postforming of 600MPa, subsequently by work-piece cools and make it to change into completely martensite, obtains high-strength work piece.After cooling, the tensile strength of boron steel workpiece is up to 1500MPa.The chemical composition of hot forming boron steel is: Al0.02%-0.05%, and B0.001%-0.005%, C0.007%-0.33%, Cr0.16%-0.37%, Mn0.75%-1.21%, N0.004-0.006%, Ni0.01-0.1%, Si0.20%-0.40%, Ti0.03%-0.05%, all the other are Fe.
The technique that hot forming boron steel adopts is at present mainly hot press-formed technique.But drop stamping technique need be led to cooling medium in mould makes high temperature work-piece cools, therefore its mould structure complexity, cost is very high.Meanwhile, if the cross section of workpiece changes, diel also needs to change, and the flexibility of production is poor.
Summary of the invention
The object of the present invention is to provide a kind of superhigh intensity opening profile hot roll bending forming technology and device, heat forming technology is more flexible, cost is lower, in the shaping of some workpiece, substitute hot press-formed technique, adapt to the development trend of the many kinds of automobile mechanism part small lot, can produce the high-quality high strength sectional material of high accuracy simultaneously.
Hot roll bending forming technology combines elevated temperature forming process and roll forming technique, not only more meets the forming requirements of high-strength steel, has realized High-efficient Production, and it is poor effectively to overcome high-strength steel plasticity, the large forming defects that waits of resilience.The present invention relates generally to the process for cooling that hot roll bending is shaped, if high temperature workpiece is carried out cooling after unloading completely, inhomogeneous cooling is even causes inside workpiece stress distribution inequality, and then makes workpiece deformation, cannot obtain meeting the workpiece of dimensional requirement.
For achieving the above object, technical scheme of the present invention is:
The present invention, in the hot roll bending of boron steel opening profile is shaped, is transferred to high temperature roll bending semi-finished product in the diel that surface is connected with cooling medium, in shaping, carries out cooling to section bar.The present invention, by shaping and cooling combining, makes section bar cooling under the state of pressurize, has avoided the distortion producing because inhomogeneous cooling is even.
Particularly, a kind of superhigh intensity opening profile hot roll bending forming technology of the present invention, comprises the steps:
1) uncoiling, cut out
Hot forming steel band is cut into the plate of product Len req and width; The chemical component weight percentage of hot forming steel band is: C0.007 ~ 0.33%, Al0.02 ~ 0.05%, B0.001 ~ 0.005%, Cr0.16 ~ 0.37%, Mn0.75 ~ 1.21%, N0.004 ~ 0.006%, Ni0.01 ~ 0.1%, Si0.20 ~ 0.40%, Ti0.03 ~ 0.05%, all the other are Fe and inevitable impurity; The original tensile strength of hot forming steel band is 500MPa ~ 650MPa;
2) be shaped
Plate is transferred in roll forming equipment, is pre-formed at ambient temperature geomery and approaches the semi-finished product opening profile of finished product;
3) heating
Semi-finished product opening profile is heated to 800 ~ 1100 DEG C, insulation 2min ~ 6min;
4) stamping forming
Rapidly high temperature semi-finished product opening profile is transferred to and in diel, carries out shaping and cooling; Mould therefor need be completely coated by semi-finished product opening profile, and with 3 ~ 10 stamping machine racks loading moulds, frame quantity is determined by the length of section bar equally; After loading, utilize mould semi-finished product opening profile to be shaped as to the finished product being of the required size; When shaping, the cooling medium of logical circulation in passage below die surface, utilize the temperature difference of mould and section bar to quench to high temperature section bar, control cooldown rate by the flow of controlling cooling medium, make cooldown rate be greater than 27 DEG C/s, opening profile is carried out coolingly under packing state, the austenite structure fast transition of the microstructure that makes section bar during by high temperature is martensitic structure under normal temperature, thereby obtains high strength sectional material.
The device that the present invention is shaped for superhigh intensity opening profile hot roll bending, it comprises, several stamping machine racks; Shaping mould, is arranged at respectively on each stamping machine rack, and shaping mould is provided with punch, die; In under die surface, be provided with the passage of logical circulating cooling medium.
Process for cooling of the present invention is that shaping process and cooling procedure are carried out simultaneously, has avoided unnecessary tissue to change, and guarantees to obtain martensitic structure completely.The type of cooling of the present invention is the cooling medium of logical circulation in the passage below die surface, not only can control cooldown rate by the flow of controlling cooling medium, and can make the cooling more even of section bar, avoids producing excessive residual stress.
Whole technological process of the present invention is referred to as hot roll bending moulding process.The technical process of hot roll bending moulding process is: the preformed of roll bending equipment normal temperature, heating semi-finished product, carry out shaping to high temperature semi-finished product, cooling down high-temperature workpiece.Hot roll bending is shaped heat forming technology and the ingenious combination of roll forming technique, not only more meets the forming requirements of high-strength steel, has realized High-efficient Production, and the forming defect such as it is poor effectively to overcome high-strength steel plasticity, and resilience is large.The cooling procedure of hot roll bending forming technology is not only determining the structure property of product, and affects the quality of product, is the key technology of hot roll bending forming technology.So innovation of the present invention is not only roll bending technique and thermoforming process are combined, but also comprise the fusion of shaping process and process for cooling and the type of cooling of utilizing the circulating cooling medium in mould to quench.
If after shaping, carry out cooling, completely unloading after, section bar carries out cooling in the time of free deformation,
1, workpiece deforms because austenite changes the thermal stress that structural stress that martensite causes and inhomogeneous cooling cause into, cannot limit this part distortion after unloading, and the dimensional accuracy of product cannot ensure;
The temperature drop of 2, shaping process workpiece and cooling curve are difficult to control, and may cause unnecessary tissue to change, and cannot obtain complete martensite.
Beneficial effect of the present invention:
(1) the present invention carries out coolingly under packing state to section bar, and the distortion of having avoided like this product to produce because inhomogeneous cooling is even, has improved the dimensional accuracy of product;
(2) material involved in the present invention is hot forming boron steel, and the boron steel section bar intensity of production is higher, and under the constant prerequisite of performance, quality significantly declines;
(3) hot roll bending forming technology involved in the present invention is higher than drop stamping explained hereafter efficiency, and flexibility is stronger.
Brief description of the drawings
Fig. 1 is shaping mould of the present invention and the schematic diagram that coordinates of opening profile (being channel-section steel 100 in figure).
Fig. 2 is the integral installation figure of shaping cooling procedure of the present invention.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described.
Referring to Fig. 1, Fig. 2, the device that the present invention is shaped for superhigh intensity opening profile hot roll bending, it comprises, several stamping machine racks 1; Shaping mould 2, is arranged at respectively on each stamping machine rack, and shaping mould 2 is provided with punch 3, die 4; In shaping mould 2 surfaces are lower, be provided with the passage 5 of logical circulating cooling medium 200.
Hot roll bending forming technology of the present invention comprises the steps: 1) uncoiling, cut out, hot forming steel band is cut into the plate of product Len req and width; 2) be shaped, plate is transferred in roll forming equipment, be pre-formed at ambient temperature geomery and approach the semi-finished product opening profile of finished product; 3) heating, is heated to 800 ~ 1100 DEG C by semi-finished product opening profile, insulation 2min ~ 6min; 4) stamping forming, is transferred to high temperature semi-finished product opening profile rapidly and in diel, carries out shaping and cooling; Shaping mould used need be completely coated by semi-finished product opening profile, and with 3 ~ 10 stamping machine racks loading shaping moulds, frame quantity is determined by the length of section bar equally; After loading, utilize mould semi-finished product opening profile to be shaped as to the finished product being of the required size; When shaping, the cooling medium of logical circulation in passage below die surface, utilize the temperature difference of mould and section bar to quench to high temperature section bar, control cooldown rate by the flow of controlling cooling medium, make cooldown rate be greater than 27 DEG C/s, opening profile is carried out coolingly under packing state, the austenite structure fast transition of the microstructure that makes section bar during by high temperature is martensitic structure under normal temperature, thereby obtains high strength sectional material.
The chemical component weight percentage of the superhigh intensity opening profile high-strength steel the present invention relates to is: C0.007 ~ 0.33%, Al0.02 ~ 0.05%, B0.001 ~ 0.005%, Cr0.16 ~ 0.37%, Mn0.75 ~ 1.21%, N0.004 ~ 0.006%, Ni0.01 ~ 0.1%, Si0.20 ~ 0.40%, Ti0.03 ~ 0.05%, all the other are Fe and inevitable impurity; The original tensile strength of hot forming steel is 500MPa ~ 650MPa;
1) be opening profile semi-finished product by normal temperature boron plate material roller o ing; 2) semi-finished product are heated to 800 DEG C, insulation 2min; 3) shift rapidly high temperature semi-finished product to shaping mould; 4) punch, the die that coordinate are up and down coated section bar completely and load it is carried out to shaping, meanwhile, at the cooling medium of the logical circulation of die surface, section bar are cooled down under packing state with the speed of 30 DEG C/s; Shaping and coolingly simultaneously finish, obtains the opening profile that normal temperature and size are qualified after die sinking.
1) be opening profile semi-finished product by normal temperature boron plate material roller o ing; 2) semi-finished product are heated to 1100 DEG C, insulation 4min; 3) shift rapidly high temperature semi-finished product to shaping mould; 4) punch die section bar is coated completely and is loaded it is carried out to shaping, meanwhile, at the cooling medium of the logical circulation of die surface, section bar is cooled down under packing state with the speed of 50 DEG C/s; Shaping and coolingly simultaneously finish, obtains the opening profile that normal temperature and size are qualified after die sinking.
1) be opening profile semi-finished product by normal temperature boron plate material roller o ing; 2) semi-finished product are heated to 1000 DEG C, insulation 5min; 3) shift rapidly high temperature semi-finished product to shaping mould; 4) punch die section bar is coated completely and is loaded it is carried out to shaping, meanwhile, at the cooling medium of the logical circulation of die surface, section bar is cooled down under packing state with the speed of 40 DEG C/s; Shaping and coolingly simultaneously finish, obtains the opening profile that normal temperature and size are qualified after die sinking.
Claims (1)
1. a superhigh intensity opening profile hot roll bending forming technology, comprises the steps:
1) uncoiling, cut out
Hot forming steel band is cut into the plate of product Len req and width; The chemical component weight percentage of hot forming steel band is: C0.007～0.33%, Al0.02～0.05%, B0.001～0.005%, Cr0.16～0.37%, Mn0.75～1.21%, N0.004～0.006%, Ni0.01～0.1%, Si0.20～0.40%, Ti0.03～0.05%, all the other are Fe and inevitable impurity; The original tensile strength of hot forming steel band is 500MPa～650MPa;
2) be shaped
Plate is transferred in roll forming equipment, is pre-formed at ambient temperature geomery and approaches the semi-finished product opening profile of finished product;
3) heating
Semi-finished product opening profile is heated to 800～1100 DEG C, insulation 2min～6min;
4) stamping forming
Rapidly high temperature semi-finished product opening profile is transferred to and in diel, carries out shaping and cooling; Mould therefor need be completely coated by semi-finished product opening profile, and with 3～10 stamping machine racks loading moulds, frame quantity is determined by the length of section bar equally; After loading, utilize mould semi-finished product opening profile to be shaped as to the finished product being of the required size; When shaping, the cooling medium of logical circulation in passage below die surface, utilize the temperature difference of mould and section bar to quench to high temperature section bar, control cooldown rate by the flow of controlling cooling medium, make cooldown rate be greater than 27 DEG C/s, opening profile is carried out coolingly under packing state, the austenite structure fast transition of the microstructure that makes section bar during by high temperature is martensitic structure under normal temperature, thereby obtains high strength sectional material.
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| CN103381440B (en) * | 2013-06-03 | 2016-03-02 | 湖北三江航天红阳机电有限公司 | A kind of thermo shaping method of Ti Alloy Curved part |
| CN103817489B (en) * | 2013-09-22 | 2016-06-29 | 温州腾德机械阀门有限公司 | A kind of cutting mould bases of butterfly plate processing technique and use thereof |
| WO2015143537A1 (en) * | 2014-03-25 | 2015-10-01 | Magna Powertrain Inc. | Method for forming power transmission components using heat-assisted calibration process and power transmission components made using method |
| CN106583544A (en) * | 2016-12-26 | 2017-04-26 | 南京工程学院 | Multiple-step forming method for martensitic steel asymmetrical complex rotary body |
| CN117238686B (en) * | 2023-09-14 | 2024-02-20 | 浙江金莱勒电气有限公司 | Isolating switch with remote brake separating mechanism and production process thereof |
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| DE102010012579B3 (en) * | 2010-03-23 | 2011-07-07 | Benteler Automobiltechnik GmbH, 33102 | Method and device for producing hardened molded components |
| CN202114938U (en) * | 2011-05-06 | 2012-01-18 | 刘宗明 | Novel hydraulic profile punching machine |
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| JP2003321713A (en) * | 2002-04-30 | 2003-11-14 | Jfe Steel Kk | Method of producing steel pipe |
| ES2402062T3 (en) * | 2006-08-24 | 2013-04-26 | Rego-Fix Ag | Pressing device |
| CN202479367U (en) * | 2012-03-28 | 2012-10-10 | 中国科学院金属研究所 | Hot stamping forming die |
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| US5526668A (en) * | 1991-10-18 | 1996-06-18 | Institute Of Technology Precision Electrical Discharge Work's | Index-feed machining system |
| DE102010012579B3 (en) * | 2010-03-23 | 2011-07-07 | Benteler Automobiltechnik GmbH, 33102 | Method and device for producing hardened molded components |
| CN202114938U (en) * | 2011-05-06 | 2012-01-18 | 刘宗明 | Novel hydraulic profile punching machine |
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Effective date of registration: 20200717 Address after: 200941 Shanghai city Baoshan District Yun Chuan Road No. 3962 Patentee after: BAOSTEEL METAL Co.,Ltd. Address before: 201900 No. 2056 Yang Yang Road, Shanghai, Baoshan District Patentee before: SHANGHAI BAOSTEEL STEEL Co.,Ltd. |
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