CN103233109A - 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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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 the smelting iron and steel technical field, refer to a kind of high-strength steel thermoforming plasticity distribution control method and device thereof particularly.
Technical background
In recent years, along with the requirement to automobile lightweight, energy-saving and emission-reduction and security improves day by day, ultrahigh-strength steel more and more is used to the important structure part of car body and the manufacturing of safe component, as A post, B post and collision prevention girders etc.Because the intensity after the high tensile steel plate cold stamping is shaped can reach 1300～1700MPa, required shaping load is big, and the resilience of the back part that is shaped is difficult to control, causes accessory size and shape stability variation.Therefore, when using high tensile steel plate to come the formed automobile safety member, generally adopt thermo shaping method.
In car safety spare was used, the part mechanical property need be complementary with the vehicle body demand for security, and different zones needs different intensity to satisfy the general safety sexual demand, and namely some zone needs high strength, and some zone needs high-ductility to absorb collision energy.In addition, can also reduce side cut and the punching difficulty of part by the control intensity distribution.
For satisfying the demand that realizes high strength or high-ductility at regional area, two kinds of technology of continuous variable cross section thin plate (TRB) of welding plate (TWB) and special rolled have been arranged at present.The steel plate that the welding plate is about to the heterogeneity different performance passes through laser assembly solder together, but welding plate blank tooling cost height, position while welding is difficult to determine that the commissure forming limit is difficult to determine in the Sheet Metal Forming Technology.Continuous variable cross section thin plate technology i.e. poor slab technology, by the rolling sheet material that obtains variable thickness, but the short run continuous variable cross section of same specification (rolling composition, mechanical property and width are identical) rolls plate production cost height, and is difficult to realize curve matching, three-dimensional splicing and widens splicing.
Summary of the invention
Purpose 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 be implemented in different zones and obtain varying strength and plasticity.
For realizing this purpose, 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: place the process furnace heating to make the blank austenitizing blank, and with blank insulation 4 ~ 6 minutes;
Step 3: blank is taken out from process furnace, in 2～4 seconds blank is moved on the mould simultaneously, according to actual needs the part of blank is placed the heating zone of mould, another part of blank places the cooling zone of mould;
Step 4: pressing machine moves downward, and drives mould and closes up, and makes the blank moulding in the mould, and the shaping blank pressurize that is positioned at the mold heated district was quenched 10～20 seconds; The shaping blank that is positioned at the mold cools down district is cooled to martensite transformation temperature, obtains martensitic stucture completely; The shaping blank zone that contacts with the mold heated district is subjected to the influence of temperature head, and rate of cooling is starkly lower than the shaping blank zone that contacts with the mold cools down district, so last arriving is mixed structure, the raising of strength degradation plasticity.
Further, in the described step 2, the blank austenitizing temperature is 900～950 ℃.
Further, in the described step 4, the rate of cooling that the shaping blank that is positioned at the mold cools down district is cooled to martensite transformation temperature is 50 ℃/s～100 ℃/s.
Further, the assigned temperature in the described step 1 is 30～450 ℃.
A kind of high-strength steel thermoforming plasticity DCU distribution control unit, it is characterized in that: it comprises silicon controlled rectifier, controller, thermopair, the counterdie seat board, heating rod, be laid on the following withstand voltage thermal baffle on the counterdie seat board, be arranged side by side that inserting in counterdie heating zone on following withstand voltage thermal baffle and inserts in the counterdie cooling zone, with the counterdie heating zone insert the coupling the patrix heating zone insert, with the counterdie cooling zone insert the coupling the patrix cooling zone insert, wherein, offer broad ways in inserting in described counterdie heating zone and run through a plurality of heating rods hole of inserting the counterdie heating zone, also offer broad ways in inserting in described patrix heating zone and run through a plurality of heating rods hole of inserting the patrix heating zone, above-mentioned heating rod is provided with heating rod in the 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, and the signal input part of controller connects thermopair.
Further, described counterdie seat board is provided with the plate gag lever post, and described plate gag lever post is positioned at a side of inserting in the 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, described counterdie seat board and all offer down the corresponding counterdie cooling zone installation slotted hole of inserting on the withstand voltage thermal baffle, insert and be installed in the counterdie cooling zone by bolt and insert and install on the slotted hole in described counterdie cooling zone.
Further, it also comprises withstand voltage thermal baffle, inserting in described patrix heating zone and inserts in the patrix cooling zone is arranged side by side on last withstand voltage thermal baffle, described offers the patrix cooling zone installation slotted hole of inserting on the withstand voltage thermal baffle, insert and be installed in the patrix cooling zone by bolt and insert and install on the 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, the heating zone mould is heated to assigned temperature by heating unit, reduce mould and the temperature head that contacts the part zone, thereby reduce this regional part rate of cooling, obtain non-martensitic stucture completely, realize the softening of tissue.Simultaneously, to the whole mechanics Effect on Performance of part, design the cooling zone of movable at zone of transition, made heating zone and die clearance, cooling zone to adjust.
The present invention is implemented in different zones and has different rate of cooling, and then obtain the slab that strong plasticity is closed by the control die temperature.The present invention compares traditional poor slab production method and welding plate producing process, can realize that one step forming obtains the high-strength steel thermoforming part that different strong plasticity distribute, and has saved pre-treatment or aftertreatment technology.In addition, the present invention is except realizing the purpose of strong plasticity Gradient distribution in a step, can also regulate the size of transitional region by adjusting spacing between inserting in the counterdie heating zone and inserts in the counterdie cooling zone, insert and spacing and the temperature parameter of counterdie cooling zone between inserting by reasonable control counterdie heating zone, improve the mechanical property of this weakness zone of zone of transition to greatest extent.
Description of 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 following withstand voltage thermal baffle in apparatus of the present invention;
Fig. 4 is the structural representation of going up 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-following 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 in 11-heating rod hole, 12-silicon controlled rectifier, 13-controller, 14-thermopair, 15-heating rod, 16-counterdie cooling zone installs slotted hole, 17-go up withstand voltage thermal baffle, inserts slotted hole, 19-cooling water channel are installed in 18-patrix cooling zone.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments:
High-strength steel thermoforming plasticity DCU distribution control unit 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 following withstand voltage thermal baffle 2 on the counterdie seat board 1, be arranged side by side counterdie heating zone on following withstand voltage thermal baffle 2 insert 4 and the counterdie cooling zone insert 5, with the counterdie heating zone insert 4 the coupling the patrix heating zone insert 9, with the counterdie cooling zone insert 5 the coupling the patrix cooling zones insert 10, wherein, insert and offer broad ways in 4 and run through insert a plurality of heating rods hole 11 of 4, counterdie heating zone in the counterdie heating zone, insert and also offer broad ways in 9 and run through insert a plurality of heating rods hole 11 of 9, patrix heating zone in the patrix heating zone, be provided with heating rod 15 in the above-mentioned heating rod hole 11, the 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, and the signal input part of controller 13 connects thermopair 14.
In the 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 the technique scheme, counterdie seat board 1 is provided with plate gag lever post 3, this plate gag lever post 3 guarantee plates when each punching press in mould stationkeeping constant, plate gag lever post 3 is positioned at an insert side of 4 of counterdie heating zone.
In the technique scheme, four angles of counterdie seat board 1 are respectively arranged with guide pillar 6, each guide pillar 6 outer guide pin bushing 7 that are provided with.The direction that moves up and down of guide pillar 6 and 7 pairs of pressing machinees of guide pin bushing is carried out spacing, thereby guarantees mould vertical up-and-down movement on pressing direction.
In the technique scheme, insert and 5 be provided with and connect the insert cooling water channel 19 of 5 widths of counterdie cooling zone in the counterdie cooling zone.During produced in small quantities, the cooling zone mould can make steel plate reach the rate of cooling of martensitic transformation by naturally cooling; Can raise if produce continuously (when being mass production) die temperature, then the cooling zone mould need feed water coolant and makes mould maintain the room temperature level in cooling water channel 19.
In the technique scheme, counterdie seat board 1 and all offer corresponding counterdie cooling zone down on the withstand voltage thermal baffle 2 and insert slotted hole 16 is installed, insert and 5 be installed in the counterdie cooling zone by bolt 8 and insert and install on the slotted hole 16 in the counterdie cooling zone.It also comprises withstand voltage thermal baffle 17, the patrix heating zone insert 9 and the patrix cooling zone insert and 10 be arranged side by side on last withstand voltage thermal baffle 17, going up and to offer the patrix cooling zone on the withstand voltage thermal baffle 17 and insert slotted hole 18 is installed, inserts and 10 is installed in the patrix cooling zone by bolt 8 and inserts and install on the slotted hole 18 in the patrix cooling zone.Above-mentioned design can change gap width with the heating zone mould by mobile cooling zone mould, thereby reaches the structure property of the purpose of regulating and control the strong plasticity of part on the whole, particularly transitional region.
In the technique scheme, withstand voltage thermal baffle has good effect of heat insulation, and can bear bigger 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 of the present invention is worked, heat in 15 pairs of mold heated districts of heating rod, be welded on thermopair 14 on the mould with the Temperature Feedback of die surface to controller, regulate heating rod power by silicon controlled rectifier, make mold heated arrive assigned temperature.
Experimental study shows, the poorest in the mechanical property of transitional region by the part that temperature treatment is realized distributing the strong plasticity of part the method for control obtained, therefore must be by optimizing the mechanical property that gap width improves 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 distributes and controls, and comprises the steps:
Step 1: the heating zone of mould is heated to assigned temperature;
Step 2: place the process furnace heating to make the blank austenitizing blank, and with 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 the mould simultaneously, according to actual needs the part of blank is placed the heating zone of mould, another part of blank places the cooling zone of mould;
Step 4: pressing machine moves downward, and drives mould and closes up, and makes the blank moulding in the mould, and the shaping blank pressurize that is positioned at the mold heated district was quenched 10～20 seconds; The shaping blank that is positioned at the mold cools down district is cooled to martensite transformation temperature, obtains martensitic stucture completely; The shaping blank zone that contacts with the mold heated district is subjected to the influence of temperature head, and rate of cooling is starkly lower than the shaping blank zone that contacts with the mold cools down district, so last arriving is mixed structure, the raising of strength degradation plasticity.
In the step 2 of technique scheme, the blank austenitizing temperature is 900～950 ℃.
In the step 4 of technique scheme, the rate of cooling that the shaping blank that is positioned at the mold cools down district is cooled to martensite transformation temperature is 50 ℃/s～100 ℃/s.
Assigned temperature in the step 1 of technique scheme is 30～450 ℃.This temperature parts locally intensity as required determines, 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 of local strength is corresponding higher.
The content that specification sheets is not described in detail belongs to this area professional and technical personnel's known prior art.
Claims (10)
1. a high-strength steel thermoforming plasticity distribution control method is characterized in that it comprises the steps:
Step 1: the heating zone of mould is heated to assigned temperature;
Step 2: place the process furnace heating to make the blank austenitizing blank, and with blank insulation 4 ~ 6 minutes;
Step 3: blank is taken out from process furnace, in 2～4 seconds blank is moved on the mould simultaneously, according to actual needs the part of blank is placed the heating zone of mould, another part of blank places the cooling zone of mould;
Step 4: pressing machine moves downward, and drives mould and closes up, and makes the blank moulding in the mould, and the shaping blank pressurize that is positioned at the mold heated district was quenched 10～20 seconds; The shaping blank that is positioned at the mold cools down district is cooled to martensite transformation temperature, obtains martensitic stucture completely; The shaping blank zone that contacts with the mold heated district is subjected to the influence of temperature head, and rate of cooling is starkly lower than the shaping blank zone that contacts with the mold cools down district, so last arriving is mixed structure, the raising of strength degradation plasticity.
2. high-strength steel thermoforming plasticity distribution control method according to claim 1, it is characterized in that: in the described step 2, the blank austenitizing temperature is 900～950 ℃.
3. high-strength steel thermoforming plasticity distribution control method according to claim 1 and 2 is characterized in that: in the described step 4, the rate of cooling that the shaping blank that is positioned at the mold cools down district is cooled to martensite transformation temperature is 50 ℃/s～100 ℃/s.
4. high-strength steel thermoforming plasticity distribution control method according to claim 1 and 2, it is characterized in that: the assigned temperature in the described step 1 is 30～450 ℃.
5. 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 following withstand voltage thermal baffle (2) on the counterdie seat board (1), be arranged side by side that insert (4) in counterdie heating zone on following withstand voltage thermal baffle (2) and insert in the counterdie cooling zone (5), with the insert patrix heating zone insert (9) of (4) coupling, counterdie heating zone, with the insert patrix cooling zone insert (10) of (5) coupling, counterdie cooling zone, wherein, insert and offer broad ways in (4) and run through insert a plurality of 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 a plurality of heating rods hole (11) of (9), patrix heating zone in described patrix heating zone, be provided with heating rod (15) in the above-mentioned heating rod hole (11), the top of inserting (4) in described counterdie heating zone or inserts in the patrix heating zone (9) sidewall arranges thermopair (14), described 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), and the signal input part of controller (13) connects thermopair (14).
6. high-strength steel thermoforming plasticity DCU distribution control unit according to claim 5, it 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.
7. according to claim 5 or 6 described high-strength steel thermoforming plasticity DCU distribution control units, it 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).
8. according to claim 5 or 6 described high-strength steel thermoforming plasticity DCU distribution control units, it 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.
9. according to claim 5 or 6 described high-strength steel thermoforming plasticity DCU distribution control units, it is characterized in that: described counterdie seat board (1) and all offer down corresponding counterdie cooling zone on the withstand voltage thermal baffle (2) and insert slotted hole (16) is installed, described counterdie cooling zone insert (5) be installed in the counterdie cooling zone by bolt (8) and insert on the installation slotted hole (16).
10. according to claim 5 or 6 described high-strength steel thermoforming plasticity DCU distribution control units, it is characterized in that: it also comprises withstand voltage thermal baffle (17), inserting (9) in described patrix heating zone and inserts in the patrix cooling zone, and (10) are arranged side by side on last withstand voltage thermal baffle (17), described offers the patrix cooling zone and inserts slotted hole (18) is installed on the withstand voltage thermal baffle (17), described patrix cooling zone insert (10) be installed in the patrix cooling zone by bolt (8) and insert on the installation slotted hole (18).
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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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| 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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| CN104438533A (en) * | 2014-11-21 | 2015-03-25 | 东莞市豪斯特热冲压技术有限公司 | Intelligent high-strength steel hot forming 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 |
| CN106457338A (en) * | 2014-06-16 | 2017-02-22 | 自动工程公司 | Hot forming die quenching |
| CN107552625A (en) * | 2017-06-22 | 2018-01-09 | 苏州普热斯勒先进成型技术有限公司 | The heater, production line and method of subregion intensity heat-punch member can be produced |
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| CN106457338A (en) * | 2014-06-16 | 2017-02-22 | 自动工程公司 | Hot forming die quenching |
| CN106457338B (en) * | 2014-06-16 | 2021-06-22 | 自动工程有限公司 | Quenching of hot forming die |
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| CN107552625B (en) * | 2017-06-22 | 2019-10-01 | 苏州普热斯勒先进成型技术有限公司 | The heating device, production line and method of subregion intensity heat-punch member can be produced |
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| CN111373059A (en) * | 2017-08-25 | 2020-07-03 | 帝国理工学院创新有限公司 | Method for forming parts from sheet metal |
| CN109590393A (en) * | 2017-10-03 | 2019-04-09 | 福特汽车公司 | For producing the cooling duct of the 3-D printing of the PHS part with tailored properties |
| CN108246896A (en) * | 2018-03-21 | 2018-07-06 | 吉林大学 | A kind of high strength steel hot forming gradient-heated device and its heating means |
| CN111918729A (en) * | 2018-03-30 | 2020-11-10 | 马自达汽车株式会社 | Hot press working method and working apparatus |
| CN110893432A (en) * | 2018-09-12 | 2020-03-20 | 无锡朗贤轻量化科技股份有限公司 | Temperature control device for segmented reinforced die insert |
| 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 |
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| 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 |
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