CN103801605B - Pressure process for cooling and the servo pin-lift arrangement of press of hot forming steel pipe segmentation strengthening class part - Google Patents
Pressure process for cooling and the servo pin-lift arrangement of press of hot forming steel pipe segmentation strengthening class part Download PDFInfo
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- 238000001816 cooling Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 35
- 239000010959 steel Substances 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 title claims abstract description 21
- 230000011218 segmentation Effects 0.000 title claims abstract description 15
- 238000005728 strengthening Methods 0.000 title claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 42
- 238000013461 design Methods 0.000 claims abstract description 6
- 238000012856 packing Methods 0.000 claims description 25
- 229910000712 Boron steel Inorganic materials 0.000 claims description 16
- 238000010791 quenching Methods 0.000 claims description 14
- 238000007493 shaping process Methods 0.000 claims description 14
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000003856 thermoforming Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 claims description 7
- 230000004069 differentiation Effects 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 4
- 150000001875 compounds Chemical group 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 description 17
- 238000003825 pressing Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 3
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
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Abstract
Pressure process for cooling and the servo pin-lift arrangement of press of the hot forming steel pipe segmentation strengthening class part in a kind of stamping technology field, by the servo push rod group of press device independently separately, adjust size and/or the stressed dwell time length of the suffered loading force of workpiece, and then control the each subregional cooling velocity of workpiece, thereby obtain the each subregional different materials mechanical performance of workpiece. The present invention can need to realize needed material behavior in arbitrary region according to what design, does not need extra arrange mold heater, has significantly reduced production cost and complex procedures degree.
Description
Technical field
What the present invention relates to is a kind of method of high-strength steel stamping technical field, specifically the hot forming of a kind of 1500MP left and rightPressure process for cooling and the servo pin-lift arrangement of press of steel pipe segmentation strengthening class part.
Background technology
Automobile boron steel steel pipe is as the emerging superhigh intensity hot forming of one steel pipe, for segmentation reinforcement technique provides possible-samePart, can, according to the needs of Automobile Design, adopt different Technologies for Heating Processing in the zones of different of this part, thereby obtains differentIntensity and plasticity. The production technology of hot forming boron steel material Ruan district technology is divided into 4 stages:
1) heating: boron steel steel pipe is heated to the needed temperature of heat treatment;
2) transmission: boron steel steel pipe is sent in mould to be punched;
3) be shaped: be at high temperature shaped by mould punching;
4) quench cooled: in the different cooling velocity of zones of different control, can occur:
A) hard area cooling (> 25 DEG C fast/s). Transformation from from austenite microstructure to martensite microstructure, obtains intensityWith extreme hardness, part that plasticity is lower. Its intensity can reach 1500-2000MPa, and plasticity is greater than 5%;
B) soft district at a slow speed cooling (< 25 DEG C/s). By controlling different cooling velocities, in the process transforming at austenite structure,Can Slow cooling, to the transformation of ferrite and pearlite microstructure, obtain the part that intensity and hardness are higher, plasticity is good;Also can be comparatively fast cooling, to the transformation of bainite microstructure, obtain the part that intensity and hardness are very high, plasticity is moderate.
Its corresponding CCT phasor as shown in Figure 1.
The boron steel material typical case that can obtain varying strength and plasticity is divided into:
| Sequence number | Material specification | Yield strength (Mpa) | Tensile strength (Mpa) | Percentage elongation (A50) | Hardness (HV2) |
| 1 | HS400 | 400±50 | 600±50 | 15％ | 170-220 |
| 2 | HS550 | 550±50 | 750±50 | 7％ | 220-255 |
| 3 | HS700 | 700±50 | 900±50 | 6％ | 270-300 |
| 4 | HS1150 | 1150±50 | 1500±50 | 5％ | 400-520 |
The chemical composition that the most common one of such boron steel can reach 1500MPa intensity (HS1150) is:
| C | Si | Mn | P | S | Cr | B | |
| min | 0.20 | 0.20 | 1.00 | - | - | 0.15 | 0.0015 |
| max | 0.25 | 0.35 | 1.30 | 0.025 | 0.015 | 0.25 | 0.0050 |
The processing technology in the soft district of the above thermoforming series of at present common acquisition is mold heated method, first by mould and die preheating extremelyThe technological temperature of 370-700 DEG C, then workpiece is heated, transmits, is shaped, is incubated, the time that is shaped and is incubated by control,And then reach the control to cooling velocity, obtain different Ruan district tissue. This process mould and relevant device more complicated, energy consumptionHigher, high expensive; In mould, be high-temperature heating state to part high-pressure forming, fillet serious wear, die life is short.
Through the retrieval of prior art is found, Chinese patent literature CN102162574, open day 2011-08-24, public affairsOpened a kind of super-high strength steel laser tailor welded and forming technology thereof, by super-high strength steel and high-strength steel according to required form laser assembly solder, soAfter the welding plate of gained is sent in the stove of protective gas and is heated to 920-940 DEG C, at least continue 5 minutes, fully austenitizing,The welding plate after austenitizing is transferred to the quick matched moulds of forcing press, shaping, then pressurize quench cooled is to 100-150 DEG C, with chamber againThe warm cooling required part that makes. But this technology is to control part machinery performance by difference being expected to thick material welds together to realize,Increased laser weld operation, technology chain is longer, and cost is also higher.
Chinese patent literature CN201180036260, open day 2013-03-27, discloses a kind of for steel pipe is madeWorkpiece thermoforming and shaping jig and the method for local pressure quench, this invention relates to a kind of for the workpiece of being made up of steel pipe is enteredThe shaping jig of row thermoforming and local pressure quench and method, wherein workpiece heats and then has die before mouldingWith thermoforming in the shaping jig of punch, shaping jig also has cooling device. Its method is characterised in that, in the pass of shaping jigClose under state contacting partly by movable die part and work between workpiece and the die of shaping jig and the contact-making surface of punchMoving punch part moves and disconnects separating from closed position to open position. Die is by a first die part and at least oneThe second die part that can move with respect to the first die part forms, and punch is by a first punch part and at least one phaseThe second punch part that can move for the first punch part forms, wherein at least one second die part that can move and extremelyLack a second punch part that can move and open equipment acting in conjunction, this is opened equipment and causes at least one second die partThe shut-in time contacting with workpiece with at least one second punch part is shorter than the first die part and the first punch part. But this technologyDefect be:
Say from object, the method be conventional way to existing soft district technology-by mold heated to 370-700 DEG C-improvement,Object is the wearing and tearing that reduce after mold heated aborning, or reduces firing equipment, but still need to heat mould, belongs toIn the temperature control technology of cooling medium.
Say from mould structure, the punch of this technical requirement activity and die inside arrange heater, thereby complex structure.
Summary of the invention
The present invention is directed to prior art above shortcomings, the pressure that proposes a kind of hot forming steel pipe segmentation strengthening class part is coolingThe servo pin-lift arrangement of technique and press, by the pressure control of servo-controlled servo pin-lift arrangement, dynamic adjustments workpiece is suffered coolingThe size of dwell pressure and time, and then control the cooling velocity in each region, thus be met each region that product design needs notWith the workpiece of the mechanical property of materials.
The present invention is achieved by the following technical solutions:
The pressure process for cooling that the present invention relates to a kind of hot forming steel pipe segmentation strengthening class part, its step comprises:
Step 1, press, mould are prepared: press pressure, speed is adjustable; Press lower table and/or press top shoe are setOn the servo push rod group that works alone, operating pressure and working time are all instantaneous adjustable, formation time-packing pressure curve;
Described servo push rod group is solidificated on press apparatus, according to the difference of workpiece size, shape, thickness etc., be shaped,In pressure maintaining period, in servo push rod minimax pressure limit, every group of push rod is by separately independently when its input of servo system controlBetween-packing pressure parameter curve, arbitrarily with the pressure size and/or the speed that regulate dynamically in real time servo push rod.
Described time-packing pressure curve specifically refers to: arrives bottom dead centre at press and starts, till press starts to move upward,In the time of this section of press closes pressurize, the pressure that the servo ejector rod system of press lower table and/or press top shoe provides at any timeBetween change curve.
Step 2, preheating: boron steel tubing is heated to more than 850 DEG C, makes the even austenitizing of tubing;
Be preferably described preheating time: 4-1200s, and with mode of heating and tubing coating Change of types and difference.
Step 3, transmission: the boron steel tubing heating is sent in thermoforming press by heater, realizes the biography to workpieceDefeated and Process Character cooling processing;
Described Process Character cooling processing refers to: transfer to the process of thermoforming press from heater, no matter adopt nature chamberThe means such as temperature, constant temperature or attemperator, are placed in certain temperature controlled environment by workpiece, and temperature when workpiece arrives thermoforming press allLower than the temperature in heater, it is cooling procedure. Its cooling velocity is preferably 5-25 DEG C/s;
The time of described transmission is controlled, and by the distance design between heater and press, and the speed of transmitting device is adjustedJoint is realized. Transmission time between heater and press is 0.1-20s, and its total transmission range is preferably 0.5-8m. Transmission dressBe set to conveyer belt and/or manipulator, speed regulates and is preferably 0-5m/s.
Step 4, is shaped: workpiece is placed in hot forming tool and is driven by press at 450-850 DEG C of temperature, downward by top dead-centreMoving to complete closure, is appointed product shape by component shaping.
Step 5, cooling pressurize: hot forming tool keeps the lower dead point position that mould is completely closed constant under the driving of press,The packing pressure that press provides also remains unchanged, and segmentation is strengthened each areal pressure by the servo ejector rod system dynamic adjustments of press, realizes notWith the quench cooling rate differentiation control in region.
Described quench cooling rate differentiation control refers to: the mechanical property of materials that need to be reached by each region of workpiece determines,Change and realize by servo push rod pressure, generally at 5-100 DEG C/s;
Described differentiation refers to: the difference of the mechanical property of materials that mould need to obtain according to the each region of workpiece, is divided into someRegion, i.e. segmentation strengthening, the servo push rod of press that each serial Ruan district and/or hard area are corresponding, the region of the self-movement of respectively doing for oneself.
Described upper and lower mould is that the pressure of the cooling packing stage in hard area is watched by press slide and/or press at the difference in each regionTaking push rod provides, but does not change, and upper and lower mould does not have the action of relative motion yet; Each soft district die insert is by servo push rodSystem drive, can self contained function, pressure size real-time change.
The material of described mould, the material that hard area mold materials is quick conductive is as high-quality mould steel, as H13, SKD61,8407 etc., soft district mold materials is selected with the identical quick conductive in hard area according to the difference of the required quenching velocity of work-piece coolsMaterial is as high-quality mould steel, or the low material of use pyroconductivity, as pottery, surperficial heat insulating coating etc.;
The servo pin-lift arrangement of press that the present invention relates to realize above-mentioned technique, comprising: upper die and lower die, press top shoe, pressLower table, be placed in servo push rod and control system and supporting workpiece inside in press top shoe and/or press lower tableDie mandrel.
Described servo push rod and control system thereof comprise: organize on press servo push rod under servo push rod and/or press more.
In described patrix and/or counterdie, be respectively equipped with material pressing core.
Described die mandrel is specifically between upper and lower molding compound core.
Described mould structure is all to only have the not equipment for cooling die higher than room temperature in the general character in each region, and mould inside does not addHot charging is put.
Described press pressure scope is preferably 50-1500t, and the speed adjustable range of press is 10-900mm/s.
In described servo push rod, the arrangement interval distance of adjacent push rod is preferably 50mm-300mm, and arbitrary lift rod stroke is excellentElect 0-300mm as, the single pressure of arbitrary push rod is preferably 0-30t.
In described upper die and lower die, patrix material pressing core and counterdie material pressing core at least one adopt high-quality mould steel as Dievar,SKD61, H13 etc. make.
Technique effect
Compared with the control of cooling velocity being realized by the temperature of mould with prior art, the present invention is by the servo push rod of press systemSystem, will control the heat conduction problem of work-piece cools speed, is converted into the problem of controlling the pressure between workpiece and the servo push rod of press,By controlled pressure, regulate the heat transfer efficiency of mould to workpiece, thereby control cooling velocity. As Fig. 2 has illustrated along with workpiece and mouldThe gap of tool, contact difference, time-packing pressure curve of heat transfer efficiency.
The present invention, as a kind of novel process of realizing high-strength hot shaping steel pipe segmentation reinforcement technique, produces for arbitrary boron steel steel pipeProduct, can be in its arbitrary region, between the tensile strength of 600-1500MPa and the even higher percentage elongation of 5-15%, freelyDefine the product requirement of its intensity and percentage elongation, thereby significantly expanded the free degree of product design. Taking automobile as example, Ke YigenAccording to the needs of collision safety, when can improving product strength or percentage elongation, control the pattern that this region collision of car body was lost efficacy, fromAnd effectively protect people's safety.
With respect to traditional high-strength steel segmentation strengthening processing technology, the present invention do not need additionally to arrange heater at mould inside, because ofAnd simple in structure, processing technology is unified; Beyond mould, do not need additional required power and the control system of mold heated yet, simplifiedThe demand of firing equipment;
Servo ejector rod system of the present invention, belongs to the one-time investment being solidificated on press apparatus. Once coming into operation, at mouldOn need only be equipped with the push rod supporting seat of correspondence position, need to servo ejector rod system be installed mould inside is extra, thereby save mouldThe cost of tool;
The servo ejector rod system of the present invention, realizes by servo-drive system, thereby in the scope of push rod license, and its ejecting force can beMoment changes arbitrarily, and pressure adjustable range is large, thereby can cover the various soft district class hot formings such as HS400, HS550, HS700Product.
Brief description of the drawings
Fig. 1 is the cooling CCT phasor of boron steel in prior art.
Fig. 2 is boron steel heat transfer efficiency change curve in prior art.
Fig. 3 is original state schematic diagram of the present invention;
Fig. 4 is that schematic diagram is processed in hot forming of the present invention;
Fig. 5 is that schematic diagram is processed in pressurize of the present invention;
In figure: servo push rod, 5 patrix material pressing cores, 6 counterdies under servo push rod, 4 press on 1 patrix, 2 counterdies, 3 pressMaterial pressing core, 7 press top shoes, 8 press lower tables, 9 die mandrels; f1～f8For diverse location pressure in mould;
Fig. 6 is the servo push rod time-packing pressure of the press of embodiment 1 curve;
Fig. 7 is the servo push rod time-packing pressure of the press of embodiment 2 curve;
Fig. 8 is the typical HS400 material crystalline phase tissue that the present invention obtains;
Fig. 9 is the typical HS1150 material crystalline phase tissue that the present invention obtains;
Figure 10 is the typical HS700 material crystalline phase tissue that the present invention obtains.
Detailed description of the invention
Below embodiments of the invention are elaborated, the present embodiment is implemented under taking technical solution of the present invention as prerequisite,Provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
As shown in Figure 3-Figure 5, workpiece is 1.8mm thickness, diameter 80mm, 1000mm length thermoforming boron steel steel pipe workPart section shaping, quenching schematic diagram. Workpiece product requirement is f6Corresponding product region is the soft district of HS400, and all the other are hard area HS1150.The concrete preparation process schematic diagram of this method, wherein:
Fig. 3 is reset condition, visible according to Fig. 3, and this method implement device comprises: servo on patrix 1, counterdie 2, pressServo push rod 4 under push rod 3, press, patrix material pressing core 5, counterdie material pressing core 6, press top shoe 7, press lower table 8,Die mandrel 9.
Described patrix 1 covers product hard area HS1150 scope, and material is high-quality mould steel SKD61;
Described patrix material pressing core 5 covers product soft district HS400 scope, and material is high-quality mould steel SKD61;
Described counterdie material pressing core 6 covers and comprises part hard area HS1150 product, and material is high-quality mould steel SKD61;
Described counterdie 2 covers all hard area HS1150s of product except counterdie material pressing core 6, and material is high-quality mould steelSKD61；
The upper and lower servo push rod 3,4 of described press is shaft-like steel, each row up and down, and 5 push rods of every row, every row is unifiedDriven by a servo-cylinder, stroke 0-300mm is adjustable, and pressure 0-150t is adjustable, and (therefore the pressure limit of single push rod exists0-30t), time-packing pressure curve is adjustable.
Fig. 3,4,5 is the present embodiment process schematic representation, and the present embodiment concrete steps comprise:
Step 1, press, mould are prepared: when operating pressure, work are set in press top shoe and/or press lower tableBetween, servo push rod that operating rate is adjustable;
Step 2, preheating: this boron steel straight tube is heated to 930 DEG C, makes the even austenitizing of tubing;
Step 3, transmission: as shown in Figure 3, in the air of 25 degree room temperatures, in 3s, workpiece is put into hot forming tool;
Step 4, is shaped: as shown in Figure 4, in 0.5s, complete forming process by 300T press, and wherein servo on pressPush rod 3 arranges 1t pressure, and under press, servo push rod 4 arranges 30t pressure, and press forming power is set to 200t.
Step 5, cooling pressurize: hot forming tool keeps the lower dead point position that mould is completely closed constant under the driving of press,The packing pressure that press provides also remains unchanged, and the servo push rod dynamic adjustments of each areal pressure by correspondence position in press strengthened in segmentation,Realize the quench cooling rate differentiation control to zones of different; As shown in Figure 5: on press, servo push rod 3 packing pressure are zero, andPromote 0.7mm, servo push rod 4 packing pressure 150t under press, servo push rod 4 times-guarantor under servo push rod 3, press on pressPressure curve is constant as Fig. 6, press packing pressure 200t, and after mold integral pressurize 30s, part is taken out in the demoulding.
Compared with prior art, the product performance index parameter that the present embodiment prepares is: f6Corresponding region workpiece material performance is HS400,Crystalline phase is organized as ferrite+pearlite, as Fig. 8; All the other are hard area HS1150 material property, and crystalline phase is organized as martensite, as figure9。
Embodiment 2
As shown in Figure 3-Figure 5, workpiece is 1.8mm thickness, diameter 80mm, 1000mm length thermoforming boron steel workpieceSection shaping, quenching schematic diagram. Workpiece product requirement is f6Corresponding product region is the soft district of HS400, f8Wei Ruan district, region HS700,All the other regions of product are hard area HS1150.
This method implement device as shown in Figure 3, wherein:
Described patrix 1 covers product hard area HS1150 All Ranges, and material is high-quality mould steel SKD61;
Described patrix material pressing core 5 covers product soft district HS400 All Ranges, and material is high-quality mould steel SKD61;
Described counterdie material pressing core 6 covers the All Ranges of the soft district HS700 of product, and material is high-quality mould steel SKD61;
Described counterdie 2 covers the All Ranges of product hard area HS1150, and material is high-quality mould steel SKD61;
The upper and lower servo push rod 3,4 of described press is shaft-like steel, each row up and down, and 5 push rods of every row, every row is unifiedDriven by a servo-cylinder, stroke 0-300mm is adjustable, and pressure 0-150t is adjustable, and (therefore the pressure limit of single push rod exists0-30t), time-packing pressure curve is adjustable.
Fig. 3,4,5 is the present embodiment process schematic representation, and compared with embodiment 1, the present embodiment concrete steps comprise:
Fig. 4 is shaped: in 0.5s, complete forming process by 300T press, wherein on press, servo push rod 3 arranges 1t pressurePower, under press, servo push rod 4 arranges 5-10t pressure, and plastic force is set to 200t. Shaping approaches end of a period stage die mandrel and insertsBoron steel steel pipe, plug, mould and workpiece laminating while guaranteeing press arrival bottom dead centre;
Fig. 5 pressurize: as shown in Figure 7, wherein on press, servo push rod 3 packing pressure are zero to time-packing pressure curve, and promote0.7mm, time-packing pressure curve is that numerical value is zero horizontal line, under press, servo push rod 4 packing pressure first half section averages are 5-10t,Before time-packing pressure curve, 15s is that amplitude is 5t, the sine curve that the cycle is 0.5s, and rear 15s is the packing pressure that 50t is constant.Press packing pressure 200t, after mold integral pressurize 30s, part is taken out in the demoulding.
Compared with prior art, the product performance index parameter that the present embodiment prepares is: f6Corresponding region workpiece material performanceFor HS400, crystalline phase is organized as ferrite+pearlite, as Fig. 8; f8Wei Ruan district, region HS700, crystalline phase is organized as ferrite+horseFamily name's body, as Figure 10; All the other are hard area HS1150 material property, and crystalline phase is organized as martensite, as Fig. 9.
Claims (2)
1. a pressure process for cooling for hot forming steel pipe segmentation strengthening class part, is characterized in that, comprises the following steps:
Step 1, press, mould are prepared: in press top shoe and/or press lower table, arrange operating pressure, working time,Servo push rod and control system thereof that operating rate is adjustable;
Step 2, preheating: boron steel tubing is heated to more than 850 DEG C, makes the even austenitizing of tubing;
Step 3, transmission: the boron steel tubing heating is sent in thermoforming press by heater, realizes the transmission to workpieceWith Process Character cooling processing;
Step 4, is shaped: workpiece is placed in hot forming tool and is driven by press at 450-850 DEG C of temperature, is transported downwards by top dead-centreMoving to complete closure, is appointed product shape by component shaping;
Step 5, pressurize is cooling: hot forming tool keeps the lower dead point position that mould is completely closed constant under the driving of press, pressesThe packing pressure that machine provides also remains unchanged, and the servo push rod dynamic adjustments of each areal pressure by correspondence position in press strengthened in segmentation, realThe now quench cooling rate differentiation control to zones of different;
Servo push rod described in step 1 and control system thereof are according to the difference of workpiece size, shape, thickness, in shaping, pressurizeIn process in servo push rod minimax pressure limit, every group of push rod by separately independently servo system control its input time-Packing pressure parameter curve, with the pressure size and the duration that regulate dynamically in real time servo push rod, real-time change is same district not arbitrarilyThe quenching packing pressure in territory;
Process Character cooling processing described in step 3 refers to: transfer to the process of thermoforming press from heater, workpiece is putIn temperature controlled environment, temperature when workpiece arrives thermoforming press is all lower than the temperature in heater, and cooling velocity is 5-25 DEG C/s；
The time of the transmission described in step 3 is controlled, by the distance design between heater and press and the speed of transmitting deviceDegree regulates and realizes, and wherein: the transmission time between heater and press is 0.1-20s, its total transmission range is 0.5-8m;Transmitting device is conveyer belt and/or manipulator, and speed is adjusted to 0-5m/s;
Quench cooling rate differentiation control described in step 5 refers to: the mechanical property of materials that need to be reached by each region of workpieceDetermine, changed and realized by the inner servo push rod pressure of press, described servo push rod and control system thereof are according to the each region of workpiece needsThe difference of the mechanical property of materials obtaining, is divided into some regions, i.e. segmentation strengthening, each serial Ruan district and/or hard area correspondenceMould and servo push rod, the region of the self-movement of respectively doing for oneself;
Quench cooling rate described in step 5 is 5-100 DEG C/s;
Described time-packing pressure parameter curve refers to: the loading of servo push rod pressure, the curve that unloading changed with the dwell time.
2. the servo pin-lift arrangement of press of realizing technique claimed in claim 1, is characterized in that, comprising: patrix, underMould, press top shoe, press lower table, be placed in servo push rod and control thereof in press top shoe and/or press lower tableThe die mandrel of system and supporting workpiece inside;
Described servo push rod and control system thereof comprise: organize on press servo push rod under servo push rod and/or press more;
The inherent each region of described upper die and lower die is equipped with the not equipment for cooling die higher than room temperature, not heating in upper die and lower dieDevice;
Described die mandrel is specifically between upper and lower molding compound core;
In described servo push rod, the arrangement interval distance of adjacent push rod is 50mm-300mm, and arbitrary lift rod stroke is 0-300mm,The single pressure of arbitrary push rod is 0-30t.
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| KR101253838B1 (en) * | 2010-12-27 | 2013-04-12 | 주식회사 포스코 | Method for Manufacturing a Multi Physical Property Part |
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| EP1462192B1 (en) * | 2003-03-28 | 2008-07-23 | Audi Ag | Method for forming a plate of heat treatable steel and device for carrying out thereof |
| CN103003003A (en) * | 2010-07-19 | 2013-03-27 | Gmf金属成型技术有限公司 | Forming tool and method for hot forming and partially press hardening a workpiece made of sheet stee |
| CN103409613A (en) * | 2013-08-30 | 2013-11-27 | 上海交通大学 | Method for realizing gradient property distribution of hot stamping workpiece |
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