CN103785733A - Pressure cooling process of segmented reinforcing type parts of hot forming steel plate, and pressing machine servo ejector rod devices - Google Patents
Pressure cooling process of segmented reinforcing type parts of hot forming steel plate, and pressing machine servo ejector rod devices Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 238000001816 cooling Methods 0.000 title claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 230000008569 process Effects 0.000 title claims abstract description 20
- 238000003825 pressing Methods 0.000 title claims abstract description 17
- 230000003014 reinforcing effect Effects 0.000 title abstract 2
- 239000000463 material Substances 0.000 claims abstract description 53
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 238000013461 design Methods 0.000 claims abstract description 6
- 229910000712 Boron steel Inorganic materials 0.000 claims description 16
- 238000012856 packing Methods 0.000 claims description 15
- 238000010791 quenching Methods 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 12
- 238000003856 thermoforming Methods 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 8
- 238000005728 strengthening Methods 0.000 claims description 8
- 230000011218 segmentation Effects 0.000 claims description 7
- 230000004069 differentiation Effects 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 229910000734 martensite Inorganic materials 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910001562 pearlite Inorganic materials 0.000 description 3
- 230000000171 quenching effect Effects 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
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005457 optimization Methods 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
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- 230000001131 transforming effect Effects 0.000 description 1
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Abstract
The invention discloses a pressure cooling process of segmented reinforcing type parts of a hot forming steel plate, and pressing machine servo ejector rod devices. Through the independent pressing machine servo ejector rod devices, the magnitude of loading force borne by a workpiece and/or force bearing and pressure keeping time for the workpiece are adjusted, and therefore the cooling speed of each sub-area of the workpiece is controlled, different types of material mechanical performance of the sub-areas of the workpiece are obtained. Required material characteristics can be achieved for any area according to the design requirements, no additional die heating device needs to be arranged, and production cost and procedure complexity are greatly reduced.
Description
Technical field
What the present invention relates to is a kind of method of high-strength steel stamping technical field, and specifically a kind of intensity reaches pressure process for cooling and the press push rod servomechanism installation of the hot forming steel plate sectional strengthening class part of 1500MP left and right.
Background technology
Automobile boron steel steel plate is as the emerging superhigh intensity hot forming of one steel plate, for segmentation reinforcement technique provides possibility-same part, can, according to the needs of Automobile Design, adopt different Technologies for Heating Processing in the zones of different of this part, thereby obtain varying strength and plasticity.The production technology of hot forming boron steel material Ruan district technology is divided into 4 stages:
1) heating: boron steel steel plate is heated to the needed temperature of heat treatment;
2) transmission: boron steel steel plate 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 fast cooling (>25 ℃/s).Transformation from from austenite microstructure to martensite microstructure, obtains intensity and 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 ℃/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 | |
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, the i.e. technological temperature to 370-700 ℃ by mould and die preheating first, again 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 consumption are higher, 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; a kind of super-high strength steel laser tailor welded and forming technology thereof are disclosed; by super-high strength steel and high-strength steel according to required form laser assembly solder; then the welding plate of gained is sent in the stove of protective gas and be heated to 920-940 ℃; at least continue 5 minutes; fully austenitizing; again the welding plate after austenitizing is transferred to the quick matched moulds of forcing press, shaping; then pressurize quench cooled is to 100-150 ℃, makes required part with room temperature is cooling.But this technology is to control part machinery performance by difference being expected to thick material welds together to realize, and has increased laser weld operation, and technology chain is longer, and cost is also higher.
Chinese patent literature CN201180036260, open day 2013-03-27, disclose a kind of for workpiece thermoforming that steel plate is made 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 plate being carried out to shaping jig and the method for thermoforming and local pressure quench, wherein workpiece heats and then thermoforming in the shaping jig with die and punch before moulding, and shaping jig also has cooling device.Its method is characterised in that, under the closed condition of shaping jig, between workpiece and the die of shaping jig and the contact-making surface of punch, contact partly by movable die part and movable punch part separating mobile disconnection the from closed position to open position.Die is made up of a first die part and at least one second die part that can move with respect to the first die part, and punch is made up of a first punch part and at least one second punch part that can move with respect to the first punch part, wherein at least one second die part that can move and at least one second punch part that can move with open equipment acting in conjunction, it is shorter than the first die part and the first punch part that this opens the shut-in time that equipment causes at least one second die part to contact with workpiece with at least one second punch part.
But the defect of this technology is: say from object, the method be conventional way to existing soft district technology-by mold heated to 370-700 ℃-improvement, object is the wearing and tearing that reduce after mold heated aborning, or minimizing firing equipment, but still need to heat mould, belong to 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, a kind of pressure process for cooling and the servo pin-lift arrangement of press of hot forming steel plate sectional strengthening class part are proposed, by the pressure control of servo-controlled forcing press pin-lift arrangement, size and the time of the suffered cooling dwell pressure of dynamic adjustments workpiece, and then control the cooling velocity in each region, thereby be met the workpiece of each region different materials mechanical performance that product design needs.
The present invention is achieved by the following technical solutions:
The cooling Optimization Technology of pressure that the present invention relates to a kind of hot forming steel plate sectional strengthening class part, its step comprises:
Described servo push rod group is solidificated on press equipment, according to the difference of workpiece size, shape, thickness etc., being shaped, in pressure maintaining period in servo push rod minimax pressure limit, every group of push rod passes through separately independently its input time-packing pressure parameter curve of servo system control, arbitrarily with the pressure size and/or the speed that regulate dynamically in real time servo push rod.
Described press pressure scope is preferably 50-1500t, and the speed adjustable range of forcing press is 10-900mm/s, and the arrangement interval distance of single push rod is preferably 50mm-300mm, and stroke is 0-300mm, and single pressure is 0-30t.
Described time-packing pressure parameter curve specifically refers to: arrive bottom dead centre at press and start, till press starts to move upward, in the time of this section of press closes pressurize, the time dependent curve of pressure that the servo ejector rod system of press lower table and/or press upper table provides.
Be preferably described preheating time: 4-1200s, and with mode of heating and sheet material coating Change of types and difference.
Described Process Character cooling processing, refer to transfer to the process of thermoforming press from heater, no matter adopt the means such as natural room temperature, constant temperature or attemperator, workpiece is placed in to certain temperature controlled environment, temperature when workpiece arrives thermoforming press, all lower than the temperature in heater, is cooling procedure.Its cooling velocity is preferably 5-25 ℃/s;
The time of described transmission is controlled, and by the distance design between heater and press, and the speed of transmitting device regulates to realize.Transmission time between heater and press is 0.1-20s, and its total transmission range is preferably 0.5-8m.Transmitting device is conveyer belt and/or manipulator, and speed regulates and is preferably 0-5m/s.
Step 4, is shaped: workpiece is placed in hot forming tool and is driven by forcing press at 450-850 ℃ of temperature, is moved downward to complete closure by top dead-centre, is configured as appointed product shape.
Described quench cooling rate differentiation control refers to: the mechanical property of materials that need to be reached by each region of workpiece determines, is changed and is realized, generally at 5-100 ℃/s by press push rod pressure;
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 some regions, i.e. segmentation strengthening, the servo push rod of forcing press that each serial Ruan district and/or hard area are corresponding, the region of the self-movement of respectively doing for oneself.
Described mould structure is that the pressure of the cooling packing stage in hard area is provided by press slide and/or the servo push rod of press at the difference in each region, but does not change, and mould does not have the action of relative motion yet; Each soft district die insert is driven by servo ejector rod system, can self contained function, and pressure size real-time change.
The material of described mould, hard area mold materials is that the material of quick conductive is as high-quality mould steel, as H13, SKD61,8407 etc., soft district mold materials is selected with the material of the identical quick conductive in hard area as high-quality mould steel according to the difference of the required quenching velocity of work-piece cools, or use the low material of 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 upper table, press lower table and be placed in patrix and/or counterdie in servo push rod and control system thereof.
Described servo push rod and control system thereof comprise: organize on press servo push rod under servo push rod and/or press more.
Described upper die and lower die inside is equipped with the not equipment for cooling die higher than room temperature in each region, and upper die and lower die inside does not have heater.
Described patrix and/or counterdie inside are provided with corresponding material pressing core.
In described upper die and lower die, patrix material pressing core and counterdie material pressing core, at least one adopts high-quality mould steel to make as Dievar, SKD61 or H13.
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 ejector rod system of forcing press, the heat conduction problem of work-piece cools speed will be controlled, be converted into the problem of controlling the pressure between workpiece and the servo push rod of press, pass through controlled pressure, regulate the heat transfer efficiency of mould to workpiece, thereby control cooling velocity.As Fig. 2 has illustrated along with gap, the contact of workpiece and mould are different, the change curve of heat transfer efficiency.
The present invention is as a kind of novel process of realizing high-strength hot shaping steel plate sectional reinforcement technique, for arbitrary boron steel steel sheet product, can be in its arbitrary region, between the tensile strength of 600-1500MPa and the even higher percentage elongation of 5-15%, freely define the product requirement of its intensity and percentage elongation, thereby significantly expanded the free degree of product design.Take automobile as example, can, according 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, thereby 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, thereby simple in structure, and processing technology is unified; Beyond mould, do not need additional required power and the control system of mold heated yet, simplified the 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, on mould, need only be equipped with the push rod supporting seat of correspondence position, need to servo ejector rod system be additionally installed at mould inside, thereby save the cost of mould;
Press ejector rod system of the present invention, realizes by servo-drive system, thereby in the scope of push rod license, its ejecting force can change arbitrarily in moment, and pressure adjustable range is large, thereby can cover the various soft districts class hot-formed products such as HS400, HS550, HS700.As shown in figure 11, the bumper energy absorption box part in auto parts and components, is particularly suitable for using this technology to example.
Accompanying drawing explanation
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 counterdie material pressing cores, 7 press upper tables (slide block), 8 press lower tables under servo push rod, 4 press on 1 patrix, 2 counterdies, 3 press;
Fig. 6 is the servo push rod pressure-time of the forcing press of embodiment 1 curve;
Fig. 7 is the servo push rod pressure-time of the forcing 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;
Figure 11 is front wall fire rated wall structure schematic diagram prepared by the present invention;
The specific embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented under take 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.
As shown in Figure 3-Figure 5, workpiece is 1.8mm thickness, and 150mm is wide, 1000mm length thermoforming boron steel workpiece section shaping, quenching schematic diagram.Workpiece product requirement is that f6 corresponding 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. 1 is reset condition, visible according to Fig. 1, and this method implement device comprises: servo push rod 4, patrix material pressing core 5, counterdie material pressing core 6, press upper table (slide block) 7, press lower table 8 under servo push rod 3, press on patrix 1, counterdie 2, press.
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 the most of product that comprises part hard area HS1150 Ji Ruan district HS400, 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 steel SKD61;
The upper and lower servo push rod 3,4 of described press is shaft-like steel, each row up and down, 5 push rods of every row, every row is unified to be driven by a servo-cylinder, stroke 0-300mm is adjustable, and pressure 0-150t is adjustable (pressure limit of single push rod is therefore at 0-30t), and pressure-time curve is adjustable.
Fig. 3,4,5 is the present embodiment process schematic representation, and the present embodiment concrete steps comprise:
Step 4, is shaped: as shown in Figure 4, in 0.5s, complete forming process by 300T forcing press, wherein on press, servo push rod 3 arranges 1t pressure, and under press, servo push rod 4 arranges 30t pressure, and press forming power is set to 200t;
Compared with prior art, the product performance index parameter that the present embodiment prepares is: f6 corresponding region workpiece material performance is HS400, and 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 Fig. 9.
As shown in Figure 3-Figure 5, workpiece is 1.8mm thickness, and 150mm is wide, 1000mm length thermoforming boron steel workpiece section shaping, quenching schematic diagram.Workpiece product requirement is that f6 corresponding product region is the soft district of HS400, and f8 is Wei Ruan district HS700 except f6 region, and all the other regions of product are hard area HS1150.
This method implement device as shown in Figure 1, wherein:
Described patrix 1 covers the soft district HS700 of product, hard area HS1150 All Ranges, and material is high-quality mould steel SKD61;
Described patrix material pressing core 5 covers product soft district HS700 All Ranges, and material is high-quality mould steel SKD61;
Described counterdie material pressing core 6 covers the All Ranges of the soft district HS400 of product, soft district HS700, 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, 5 push rods of every row, every row is unified to be driven by a servo-cylinder, stroke 0-300mm is adjustable, and pressure 0-150t is adjustable (pressure limit of single push rod is therefore at 0-30t), and pressure-time curve is adjustable.
Fig. 3,4,5 the present embodiment process schematic representations, compared with embodiment 1, the present embodiment concrete steps comprise:
Fig. 4 is shaped: in 0.5s, complete forming process by 300T forcing press, wherein on press, servo push rod 3 arranges 1t pressure, and under press, servo push rod 4 arranges 5-10t pressure, and plastic force is set to 200t;
Fig. 5 pressurize: pressurize curve as shown in Figure 7, wherein on press, servo push rod 3 packing pressure are zero, and promote 0.7mm, pressurize 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 pressurize 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: f6 corresponding region workpiece material performance is HS400, and crystalline phase is organized as ferrite+pearlite, as Fig. 8; F8 is Wei Ruan district HS700 except f6 region, and crystalline phase is organized as ferrite+martensite, as Figure 10; All the other are hard area HS1150 material property, and crystalline phase is organized as martensite, as Fig. 9.
Claims (10)
1. a pressure process for cooling for hot forming steel plate sectional strengthening class part, is characterized in that, comprises the following steps:
Step 1, press, mould are prepared: operating pressure, working time, servo push rod and control system thereof that operating rate is adjustable are set in press upper table and/or press lower table;
Step 2, preheating: boron steel sheet material is heated to more than 850 ℃, makes the even austenitizing of sheet material;
Step 3, transmission: the boron steel heating is sent in thermoforming press by heater, realizes transmission and Process Character cooling processing to workpiece;
Step 4, is shaped: workpiece is placed in hot forming tool and is driven by forcing press at 450-850 ℃ of temperature, moved downward to complete closure by top dead-centre, and be appointed product shape by component shaping;
Step 5, pressurize is cooling: hot-forming die 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, the servo push rod dynamic adjustments of each areal pressure by correspondence position in press strengthened in segmentation, realizes the quench cooling rate differentiation control to zones of different.
2. technique according to claim 1, it is characterized in that, described servo push rod and control system thereof are according to the difference of workpiece size, shape, thickness, being shaped, in pressure maintaining period in servo push rod minimax pressure limit, every group of push rod passes through separately independently its input time-packing pressure parameter curve of servo system control, regulates dynamically pressure size and/or the speed of servo push rod arbitrarily and in real time and works alone.
3. technique according to claim 1, it is characterized in that, Process Character cooling processing described in step 3, refer to transfer to the process of thermoforming press from heater, workpiece is placed in to temperature controlled environment, temperature when workpiece arrives thermoforming press is all lower than the temperature in heater, and cooling velocity is 5-25 ℃/s.
4. technique according to claim 1, it is characterized in that, the time of the transmission described in step 3 is controlled, regulate to realize by the distance design between heater and press and the speed of transmitting device, 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.
5. technique according to claim 1, is characterized in that, the 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 workpiece determines, is changed and is realized by the inner servo push rod pressure of press; The difference of the mechanical property of materials that corresponding ejector rod system need to obtain according to the each region of workpiece, is divided into some regions, i.e. segmentation strengthening, the mould that each serial Ruan district and/or hard area are corresponding and press push rod, the region of the self-movement of respectively doing for oneself.
6. technique according to claim 1 or 5, is characterized in that, the quench cooling rate described in step 5 is 5-100 ℃/s.
7. technique according to claim 1, is characterized in that, described time-packing pressure parameter curve refers to: the loading that servo push rod is pressed, the curve that unloading changed with the dwell time.
8. the servo pin-lift arrangement of press of realizing the technique described in above-mentioned arbitrary claim, is characterized in that, comprising: upper die and lower die, press upper table, press lower table and be placed in patrix and/or counterdie in servo push rod and control system thereof;
Described servo push rod and control system thereof comprise: organize on press servo push rod under servo push rod and/or press more;
Described upper die and lower die inside is equipped with the not equipment for cooling die higher than room temperature in each region, and upper die and lower die inside does not have heater.
9. device according to claim 8, is characterized in that, the arrangement interval distance of described servo push rod is 50mm-300mm; Stroke is 0-300mm, the limiting pressure 1-30t of single servo push rod.
10. device according to claim 8, is characterized in that, in described upper die and lower die, patrix material pressing core and counterdie material pressing core, at least one adopts high-quality mould steel to make as Dievar, SKD61 or H13.
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| CN111154960A (en) * | 2019-12-31 | 2020-05-15 | 东风天汽模（武汉）金属材料成型有限公司 | Hot-forming soft and hard area part and production process thereof |
| CN114589266A (en) * | 2022-03-16 | 2022-06-07 | 佛山华智新材料有限公司 | Hot pressing process for vapor chamber |
| CN115532952A (en) * | 2022-09-30 | 2022-12-30 | 重庆至信实业集团有限公司 | A high-strength automobile door post processing method and mold |
| CN117960900A (en) * | 2024-03-27 | 2024-05-03 | 无锡朗贤轻量化科技股份有限公司 | Thermoforming sectional strengthening process and mould for thermoforming high-strength steel |
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| CN111154960A (en) * | 2019-12-31 | 2020-05-15 | 东风天汽模（武汉）金属材料成型有限公司 | Hot-forming soft and hard area part and production process thereof |
| CN114589266A (en) * | 2022-03-16 | 2022-06-07 | 佛山华智新材料有限公司 | Hot pressing process for vapor chamber |
| CN115532952A (en) * | 2022-09-30 | 2022-12-30 | 重庆至信实业集团有限公司 | A high-strength automobile door post processing method and mold |
| CN117960900A (en) * | 2024-03-27 | 2024-05-03 | 无锡朗贤轻量化科技股份有限公司 | Thermoforming sectional strengthening process and mould for thermoforming high-strength steel |
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| CN103785733B (en) | 2016-04-27 |
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