CN103233109B - Control method and device for hot-forming plasticity distribution of high-strength steel - Google Patents
Control method and device for hot-forming plasticity distribution of high-strength steel Download PDFInfo
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- CN103233109B CN103233109B CN201310175401.6A CN201310175401A CN103233109B CN 103233109 B CN103233109 B CN 103233109B CN 201310175401 A CN201310175401 A CN 201310175401A CN 103233109 B CN103233109 B CN 103233109B
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Abstract
The invention provides a control method and device for hot-forming plasticity distribution of high-strength steel. The control method comprises the following steps of: step one, heating a heating region of a mold to an appointed temperature; step two, placing and heating a blank in a heating furnace, so that the blank is austenized; step three, taking out the blank from the heating furnace, placing a part of blank in the heating region of the mold according to actual requirements, and placing the another part of blank in a cooling region of the mold; and step four, moving a press machine downwards so as to drive the mold to be closed, so that the blank in the mold is molded. The control device comprises a low mold seat board, a lower voltage withstanding heat insulation plate, a lower mold heating region insert, a lower mold cooling region insert, an upper mold heating region insert, an upper mold cooling region insert, a heating rod hole, a silicon controlled rectifier, a controller, a thermocouple and a heating rod. The control method and device can ensure that a high-strength steel sheet has different strength and plasticity in different regions.
Description
Technical field
The present invention relates to smelting iron and steel technical field, refer to particularly a kind of high-strength steel thermoforming plasticity distribution control method and device thereof.
Technical background
In recent years, along with the requirement of automotive light weight technology, energy-saving and emission-reduction and security is improved day by day, ultrahigh-strength steel is more and more used to the important structure part of car body and the manufacture of safe component, as A post, B post and collision prevention girders etc.Because the intensity after high tensile steel plate cold stamping shaping can reach 1300～1700MPa, required shaping load is large, and after being shaped, the resilience of part is difficult to control, and causes accessory size and shape stability variation.Therefore,, while carrying out formed automobile safety member with high tensile steel plate, generally adopt thermo shaping method.
In the application of car safety part, part mechanical property need to match with vehicle body demand for security, and different zones needs different intensity to meet general safety sexual demand, and some region needs high strength, and some region needs high-ductility to absorb collision energy.In addition can also reduce, trimming and the punching difficulty of part by controlling intensity distribution.
For meeting the demand that realizes high strength or high-ductility at regional area, there are at present two kinds of technology of continuous variable cross section thin plate (TRB) of tailor welded (TWB) and special rolled.By the steel plate of heterogeneity different performance by laser assembly solder together, but tailor welded blank tooling cost is high for tailor welded, and position while welding is difficult to determine, in Sheet Metal Forming Technology, commissure forming limit is difficult to determine.Continuous variable cross section thin slab technique i.e. poor slab technology, obtain the sheet material of variable thickness by rolling, but it is high that the short run continuous variable cross section of same specification (rolling composition, mechanical property and width are identical) rolls plate production cost, and be difficult to realize curve matching, three-dimensional splicing and widen splicing.
Summary of the invention
Object of the present invention will provide a kind of high-strength steel thermoforming plasticity distribution control method and device thereof exactly, and these apparatus and method can make high tensile steel plate realize in different zones and obtain varying strength and plasticity.
For realizing this object, the high-strength steel thermoforming plasticity distribution control method that the present invention is designed, is characterized in that, it comprises the steps:
Step 1: the heating zone of mould is heated to assigned temperature;
Step 2: blank is placed in to process furnace heating and makes blank austenitizing, and by blank insulation 4 ~ 6 minutes;
Step 3: blank is taken out from process furnace, in 2～4 seconds, blank is moved on mould, according to actual needs a part for blank is placed in to the heating zone of mould, another part of blank is placed in the cooling zone of mould simultaneously;
Step 4: pressing machine moves downward, driven mold closes up, and makes the blank moulding in mould, and the shaping blank pressurize that is positioned at mold heated district is quenched 10～20 seconds; The shaping blank that is positioned at mold cools down district is cooled to martensite transformation temperature, obtains martensitic stucture completely; The shaping blank region contacting with mold heated district is subject to the impact of temperature head, and rate of cooling is starkly lower than the shaping blank region contacting with mold cools down district, and therefore last to being mixed structure, strength degradation plasticity improves.
Further, in described step 2, blank austenitizing temperature is 900～950 DEG C.
Further, in described step 4, it is 50 DEG C/s～100 DEG C/s that the shaping blank that is positioned at mold cools down district is cooled to the rate of cooling of martensite transformation temperature.
Further, the assigned temperature in described step 1 is 30～450 DEG C.
A kind of high-strength steel thermoforming plasticity DCU distribution control unit, it is characterized in that: it comprises silicon controlled rectifier, controller, thermopair, counterdie seat board, heating rod, be laid on the lower withstand voltage thermal baffle on counterdie seat board, be arranged side by side that inserting in counterdie heating zone on lower withstand voltage thermal baffle and inserts in counterdie cooling zone, insert with the patrix heating zone of mating of inserting, counterdie heating zone, insert with the patrix cooling zone of mating of inserting, counterdie cooling zone, wherein, described counterdie heating zone offers broad ways and runs through multiple heating rods hole of inserting counterdie heating zone in inserting, described patrix heating zone also offers broad ways and runs through multiple heating rods hole of inserting patrix heating zone in inserting, above-mentioned heating rod is provided with heating rod in hole, the top of inserting in described counterdie heating zone or inserts in patrix heating zone sidewall arranges thermopair, described each heating rod all connects silicon controlled control signal output terminal, silicon controlled control signal input terminus connects the signal output part of controller, the signal input part of controller connects thermopair.
Further, described counterdie seat board is provided with plate gag lever post, and described plate gag lever post is positioned at a side of inserting in counterdie heating zone.
Further, four angles of described counterdie seat board are respectively arranged with guide pillar, and described each guide pillar is provided with guide pin bushing outward.
Further, insert to be provided with and connect the insert cooling water channel of width of counterdie cooling zone in described counterdie cooling zone.
Further, all offering the corresponding counterdie cooling zone installation slotted hole of inserting on described counterdie seat board and lower withstand voltage thermal baffle, inserts and is arranged on counterdie cooling zone by bolt and inserts and install on slotted hole in described counterdie cooling zone.
Further, it also comprises withstand voltage thermal baffle, inserting in described patrix heating zone and inserts in patrix cooling zone is arranged side by side on upper withstand voltage thermal baffle, on described withstand voltage thermal baffle, offering the patrix cooling zone installation slotted hole of inserting, inserts and is arranged on patrix cooling zone by bolt and inserts and install on slotted hole in described patrix cooling zone.
Principle of design of the present invention is: utilize the mould of piecemeal to realize the control of rate of cooling, mould comprises heating zone and cooling zone, heating zone mould is heated to assigned temperature by heating unit, reduce the temperature head in mould and contact part region, thereby reduce the part rate of cooling in this region, obtain non-martensitic stucture completely, realize the softening of tissue.Meanwhile, the impact for zone of transition on part entirety mechanical property, has designed the cooling zone of movable, and heating zone and die clearance, cooling zone can be adjusted.
The present invention, by controlling die temperature, realizes and has different rate of cooling in different zones, and then obtain the slab that strong plasticity is closed.The present invention compares traditional poor slab production method and tailor welded production method, can realize one step forming and obtain the high-strength steel thermoforming part that different strong plasticity distributes, and has saved pre-treatment or aftertreatment technology.In addition, the present invention is except a step realizing the object of strong plasticity Gradient distribution, can also be by adjusting to insert in counterdie heating zone and the spacing of counterdie cooling zone between inserting regulates the size of transitional region, insert and spacing and the temperature parameter of counterdie cooling zone between inserting by reasonable control counterdie heating zone, improve to greatest extent the mechanical property of this weakness zone of zone of transition.
Brief description of the drawings
Fig. 1 is the mechanical part structural representation of apparatus of the present invention;
Fig. 2 is the circuit part structural representation of apparatus of the present invention;
Fig. 3 is the structural representation of lower withstand voltage thermal baffle in apparatus of the present invention;
Fig. 4 is the structural representation of upper withstand voltage thermal baffle in apparatus of the present invention;
Fig. 5 is the structural representation of counterdie seat board in apparatus of the present invention;
Wherein, inserting in 1-counterdie seat board, 2-lower withstand voltage thermal baffle, 3-plate gag lever post, 4-counterdie heating zone, inserts in 5-counterdie cooling zone, 6-guide pillar, 7-guide pin bushing, 8-bolt, 9-patrix heating zone are inserted, insert in 10-patrix cooling zone, insert slotted hole, 17-upper withstand voltage thermal baffle is installed in 11-heating rod hole, 12-silicon controlled rectifier, 13-controller, 14-thermopair, 15-heating rod, 16-counterdie cooling zone, insert slotted hole, 19-cooling water channel are installed in 18-patrix cooling zone.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
High-strength steel thermoforming plasticity DCU distribution control unit as shown in Fig. 1 ~ 5, comprise silicon controlled rectifier 12, controller 13, thermopair 14, counterdie seat board 1, heating rod 15, be laid on the lower withstand voltage thermal baffle 2 on counterdie seat board 1, be arranged side by side counterdie heating zone on lower withstand voltage thermal baffle 2 insert 4 and counterdie cooling zone insert 5, insert 9 with the 4 patrix heating zone of mating of inserting, counterdie heating zone, insert 10 with the 5 patrix cooling zones of mating of inserting, counterdie cooling zone, wherein, insert and offer broad ways in 4 and run through insert multiple heating rods hole 11 of 4, counterdie heating zone in counterdie heating zone, insert and also offer broad ways in 9 and run through insert multiple heating rods hole 11 of 9, patrix heating zone in patrix heating zone, in above-mentioned heating rod hole 11, be provided with heating rod 15, counterdie heating zone insert 4 or the insert top of 9 sidewalls, patrix heating zone thermopair 14 is set, each heating rod 15 all connects the control signal output terminal of silicon controlled rectifier 12, the control signal input terminus of silicon controlled rectifier 12 connects the signal output part of controller 13, the signal input part of controller 13 connects thermopair 14.
In technique scheme, silicon controlled rectifier 12 passing ratios, integration, differential control (PID control) make heating rod 15 reach assigned temperature, and thermopair 14 is K shape thermopair, is welded on the sidewall of die face 1～3mm.
In technique scheme, counterdie seat board 1 is provided with plate gag lever post 3, this plate gag lever post 3 ensure plate in the time of each punching press in mould position immobilize, plate gag lever post 3 is positioned at an insert side of 4 of counterdie heating zone.
In technique scheme, four angles of counterdie seat board 1 are respectively arranged with guide pillar 6, the outer guide pin bushing 7 that is provided with of each guide pillar 6.Guide pillar 6 and guide pin bushing 7 carry out spacing to the direction that moves up and down of pressing machine, thereby ensure mould vertical up-and-down movement on pressing direction.
In technique scheme, insert and 5 be provided with and connect the insert cooling water channel 19 of 5 widths of counterdie cooling zone in counterdie cooling zone.When a small amount of production, cooling zone mould can make steel plate reach the rate of cooling of martensitic transformation by naturally cooling; Can raise if produce continuously (i.e. when a large amount of production) die temperature, cooling zone mould need to pass into water coolant and makes mould maintain room temperature level in cooling water channel 19.
In technique scheme, all offering corresponding counterdie cooling zone and insert slotted hole 16 is installed on counterdie seat board 1 and lower withstand voltage thermal baffle 2, inserts and 5 is arranged on counterdie cooling zone by bolt 8 and inserts and install on slotted hole 16 in counterdie cooling zone.It also comprises withstand voltage thermal baffle 17, patrix heating zone insert 9 and patrix cooling zone insert and 10 be arranged side by side on upper withstand voltage thermal baffle 17, on upper withstand voltage thermal baffle 17, offering patrix cooling zone and insert slotted hole 18 is installed, inserts and 10 is arranged on patrix cooling zone by bolt 8 and inserts and install on slotted hole 18 in patrix cooling zone.Above-mentioned design can change and the gap width of heating zone mould by mobile cooling zone mould, thereby reaches the structure property of the object that regulates and controls on the whole the strong plasticity of part, particularly transitional region.
In technique scheme, withstand voltage thermal baffle has good effect of heat insulation, and can bear larger mechanical pressure, prevents from making thermal baffle crushed because pressure is excessive in forming process.
When high-strength steel thermoforming plasticity DCU distribution control unit work of the present invention, heating rod 15 heats mold heated district, the Temperature Feedback of die surface is arrived controller by the thermopair 14 being welded on mould, regulates heating rod power by silicon controlled rectifier, makes mold heated arrive assigned temperature.
Experimental study shows, realize the strong plasticity of the part part that the method controlled obtains that distributes by temperature treatment the poorest in the mechanical property of transitional region, therefore must improve by Optimization gap value the mechanical property of transitional region, mobile patrix cooling zone inserts 10 and counterdie cooling zone 5 gap widths of adjusting transitional region of inserting, and the regulation range of gap width is 0～10mm.
Above-mentioned high-strength steel thermoforming plasticity DCU distribution control unit carries out the method that plasticity distribution is controlled, and comprises the steps:
Step 1: the heating zone of mould is heated to assigned temperature;
Step 2: blank is placed in to process furnace heating and makes blank austenitizing, and by blank insulation 4 ~ 6 minutes, be preferably 5 minutes;
Step 3: blank is taken out from process furnace, in 2～4 seconds, blank is moved on mould, according to actual needs a part for blank is placed in to the heating zone of mould, another part of blank is placed in the cooling zone of mould simultaneously;
Step 4: pressing machine moves downward, driven mold closes up, and makes the blank moulding in mould, and the shaping blank pressurize that is positioned at mold heated district is quenched 10～20 seconds; The shaping blank that is positioned at mold cools down district is cooled to martensite transformation temperature, obtains martensitic stucture completely; The shaping blank region contacting with mold heated district is subject to the impact of temperature head, and rate of cooling is starkly lower than the shaping blank region contacting with mold cools down district, and therefore last to being mixed structure, strength degradation plasticity improves.
In the step 2 of technique scheme, blank austenitizing temperature is 900～950 DEG C.
In the step 4 of technique scheme, it is 50 DEG C/s～100 DEG C/s that the shaping blank that is positioned at mold cools down district is cooled to the rate of cooling of martensite transformation temperature.
Assigned temperature in the step 1 of technique scheme is 30～450 DEG C.This temperature parts locally intensity is as required determined, the Heating Zone Temperature of the mould that the high part correspondence of local strength is lower, the Heating Zone Temperature of the mould that the low part correspondence of local strength is higher.
The content that specification sheets is not described in detail belongs to the known prior art of professional and technical personnel in the field.
Claims (6)
1. a high-strength steel thermoforming plasticity DCU distribution control unit, it is characterized in that: it comprises silicon controlled rectifier (12), controller (13), thermopair (14), counterdie seat board (1), heating rod (15), be laid on the lower withstand voltage thermal baffle (2) on counterdie seat board (1), be arranged side by side that insert (4) in counterdie heating zone on lower withstand voltage thermal baffle (2) and insert in counterdie cooling zone (5), with the patrix heating zone that (4) mate insert (9) of inserting, counterdie heating zone, with the patrix cooling zone that (5) mate insert (10) of inserting, counterdie cooling zone, wherein, insert and offer broad ways in (4) and run through insert multiple heating rods hole (11) of (4), counterdie heating zone in described counterdie heating zone, insert and also offer broad ways in (9) and run through insert multiple heating rods hole (11) of (9), patrix heating zone in described patrix heating zone, in each heating rod hole (11), be provided with heating rod (15), the top of inserting (4) in described counterdie heating zone or inserts in patrix heating zone (9) sidewall arranges thermopair (14), each heating rod (15) all connects the control signal output terminal of silicon controlled rectifier (12), the control signal input terminus of silicon controlled rectifier (12) connects the signal output part of controller (13), the signal input part of controller (13) connects thermopair (14).
2. high-strength steel thermoforming plasticity DCU distribution control unit according to claim 1, is characterized in that: described counterdie seat board (1) is provided with plate gag lever post (3), and described plate gag lever post (3) is positioned at the insert side of (4) of counterdie heating zone.
3. high-strength steel thermoforming plasticity DCU distribution control unit according to claim 1 and 2, is characterized in that: four angles of described counterdie seat board (1) are respectively arranged with guide pillar (6), the outer guide pin bushing (7) that is provided with of described each guide pillar (6).
4. high-strength steel thermoforming plasticity DCU distribution control unit according to claim 1 and 2, is characterized in that: described counterdie cooling zone insert (5) be provided with and connect the insert cooling water channel (19) of (5) width of counterdie cooling zone.
5. high-strength steel thermoforming plasticity DCU distribution control unit according to claim 1 and 2, it is characterized in that: on described counterdie seat board (1) and lower withstand voltage thermal baffle (2), all offer corresponding counterdie cooling zone and insert slotted hole (16) is installed, described counterdie cooling zone insert (5) be arranged on counterdie cooling zone by bolt (8) and insert in installation slotted hole (16).
6. high-strength steel thermoforming plasticity DCU distribution control unit according to claim 1 and 2, it is characterized in that: it also comprises withstand voltage thermal baffle (17), inserting (9) in described patrix heating zone and inserts in patrix cooling zone, and (10) are arranged side by side on upper withstand voltage thermal baffle (17), on described withstand voltage thermal baffle (17), offer patrix cooling zone and insert slotted hole (18) is installed, described patrix cooling zone insert (10) be arranged on patrix cooling zone by bolt (8) and insert in installation slotted hole (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310175401.6A CN103233109B (en) | 2013-05-13 | 2013-05-13 | Control method and device for hot-forming plasticity distribution of high-strength steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310175401.6A CN103233109B (en) | 2013-05-13 | 2013-05-13 | Control method and device for hot-forming plasticity distribution of high-strength steel |
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| CN103233109A CN103233109A (en) | 2013-08-07 |
| CN103233109B true CN103233109B (en) | 2014-08-13 |
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| EP2957361A1 (en) * | 2014-06-16 | 2015-12-23 | Autotech Engineering, A.I.E. | Hot forming die quenching |
| CN104438533B (en) * | 2014-11-21 | 2016-06-29 | 东莞市豪斯特热冲压技术有限公司 | High-strength steel hot forming intelligent flexible production method |
| CN104942111A (en) * | 2015-07-01 | 2015-09-30 | 上海凌云汽车模具有限公司 | Method for producing hot-forming part with variable strength and lower die base of die |
| CN107186029A (en) * | 2017-06-22 | 2017-09-22 | 苏州普热斯勒先进成型技术有限公司 | A kind of heater, production line and method for producing subregion intensity heat-punch member |
| GB201713741D0 (en) * | 2017-08-25 | 2017-10-11 | Imp Innovations Ltd | Fast warm stamping method for metal sheets |
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| JP7214973B2 (en) * | 2018-03-30 | 2023-01-31 | マツダ株式会社 | HOT PRESSING METHOD AND PROCESSING APPARATUS |
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| CN112238646B (en) * | 2019-07-19 | 2024-03-19 | 苏州汉扬精密电子有限公司 | Hot-pressing and cold-pressing combined integrated mechanism |
| CN112058984B (en) * | 2020-07-28 | 2022-09-13 | 深圳新顿科技有限公司 | Light alloy plate punch forming process and punching device |
| CN112059548B (en) * | 2020-08-28 | 2022-01-25 | 东风商用车有限公司 | Manufacturing process for front lower protection of ultrahigh-strength commercial vehicle |
| CN113290150B (en) * | 2021-04-30 | 2024-03-15 | 合肥合锻智能制造股份有限公司 | Detachable temperature-controllable hot-pressing combined die |
| CN113997548A (en) * | 2021-10-26 | 2022-02-01 | 吉林省正轩车架有限公司 | Process method for integrally forming door ring TTP |
| CN114101444B (en) * | 2021-11-25 | 2022-07-19 | 重庆百能达普什汽车零部件有限责任公司 | Automobile rear longitudinal beam variable-strength hot stamping device and production process |
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Effective date of registration: 20171116 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Co-patentee after: HUAZHONG University OF SCIENCE AND TECHNOLOGY Patentee after: WUHAN IRON AND STEEL Co.,Ltd. Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Co-patentee before: Huazhong University of Science and Technology Patentee before: WUHAN IRON AND STEEL (GROUP) Corp. |
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Granted publication date: 20140813 |