CN104294020A - Heat stamping apparatus used for quenching control - Google Patents
Heat stamping apparatus used for quenching control Download PDFInfo
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- CN104294020A CN104294020A CN201410410577.XA CN201410410577A CN104294020A CN 104294020 A CN104294020 A CN 104294020A CN 201410410577 A CN201410410577 A CN 201410410577A CN 104294020 A CN104294020 A CN 104294020A
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- temperature
- drip molding
- quenching
- contact pressure
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/673—Quenching devices for die quenching
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
Abstract
The invention provides a heat stamping apparatus used for quenching control, which belongs to the technical field of heat stamping. A purpose of the present invention is to solve the problems that in a heat stamping technology, in the quenching process of a high-temperature forming part, uniform distribution of surface temperature of the forming part can not be guaranteed on the condition that quenching uniformity is guaranteed, and the invention provides the heat stamping apparatus used for heat stamping quenching control. The heat stamping apparatus enables real time monitoring on the temperature value of selected measurement points during a high-temperature plate shaping process, the quenching rate and temperature difference between the selected measurement points can be obtained through data processing; when the quenching rate can not satisfy the condition or the temperature difference is large, a control system is capable of adjusting contact pressure and cooling water flow velocity of the forming parts and mold surface with pertinence according to the trigger condition, then the quenching rate of the high-temperature forming parts can satisfy the requirement, and the temperature of the forming parts can be equalized, so that the intensity quality requirement and the forming precision requirement of the final forming parts can be ensured.
Description
Technical field
The invention provides a kind of for the hot stamping device controlled that quenches, belong to hot stamping technical field.
Background technology
Ultrahigh-strength steel plates formed automotive body parts are used to be the effective means realizing body lightening, but traditional cold stamping technology is in the face of ultrahigh-strength steel plates high strength at normal temperatures and low elongation feature, seem unable to do what one wishes, therefore hot stamping technology is arisen at the historic moment, and it can solve the limitation of ultrahigh-strength steel plates forming property under normal temperature.
Hot stamping technology is a kind of advanced manufacturing technology of the superstrength part that is shaped, its principle be first by the superstrength heat parts after ultrahigh-strength steel plates or preliminary shaping to more than 950 DEG C, special dies internal shaping is sent into after complete austenitizing, die quenching is carried out after pressurize for some time, under the quench rates being greater than 30 DEG C/S, drip molding microtexture is martensite by austenitic transformation, thus makes the intensity of final drip molding reach more than 1500MPa.
For quenching technology, not only to ensure that temperature fall off rate reaches quenching and requires to ensure that austenite is to martensitic transformation, be also noted that the temperature of each several part in hot forming part process of cooling can not have big difference, in order to avoid generation quenching stress, comprise the structural stress after the thermal stresses before martensitic transformation and martensitic transformation, affect surface quality and the form accuracy of final drip molding, therefore, optimum quenching control techniques arrives following situation: the quench rates of hot forming part entirety is evenly and more than 30 DEG C/S, and drip molding uniformity of temperature profile in quenching process, namely temperature head is less than 50 DEG C everywhere.
Chinese patent literature CN103240867A discloses one " a kind of hot-forming die temperature inspection and control system "; This system is made up of system for detecting temperature and temperature controlling system, the real-time detection to hot-forming die temperature can be realized, and the temperature information collected is changed into rate of cooling value, then with preset rate of cooling value and compare and calculate, and then Controlling solenoid valve regulates cooling water flow, realize the control to mould each district temperature, thus enable plate rate of cooling remain on a certain steady state value, ensure that the quality product of each hot stamping is in same level; Although this invention realizes the homogeneity of quenching by controlled cooling model water flow velocity, the homogeneity of drip molding temperature distribution in quenching cannot be ensured; To be converted quench rates by Measurement die temperature, but due to die temperature variation range less, the quench rates by measuring drip molding temperature and the gained that converts is accurate; Regulate quench rates by controlled cooling model water flow velocity, regulation range is narrower.
Find by literature search, in current water-cooled press tool for quenching control be mostly early stage by numerical simulation to cooling duct design be optimized, by the combination of different pipeline section parameter and space path, be aided with suitable cooling-water flowing speed, ensure that the speed of quenching and homogeneity reach requirement as far as possible, but helpless for homogeneous temperature distribution in control high temperature sheet forming process, also have and attempt controlling drip molding local temperature fall off rate by the speed of controlled cooling model current, but generally can only work early stage in quenching, this is because early stage drip molding and mould between the temperature difference larger, therefore the heat transmitted is greater than the heat that water coolant under general flow velocity can be taken away, therefore water coolant flow velocity can be increased to control drip molding temperature actively, but to the later stage, between drip molding and mould, the temperature difference is less, between the heat that transmits be less than the heat that water coolant under general flow velocity can take away, want control temperature then must reduce water coolant flow velocity, but this has influence on quenching velocity, therefore inadvisable.
Therefore in sum, research and develop a kind of Controlling System that can realize the distribution of drip molding homogeneous temperature under the condition ensureing hot forming part quenching uniformity very important for the forming quality improving hot stamping part, also help lend some impetus to the development of hot stamping technology.
Summary of the invention
The object of the invention is to solve in hot stamping technology, being difficult in hot forming part quenching process take into account the equally distributed problem of drip molding surface temperature under the condition ensureing quenching uniformity, propose a kind of hot stamping device controlled for hot stamping quenching; It can in high temperature sheet forming process the temperature value of measurement point selected by Real-Time Monitoring, obtain the quench rates of selected measurement point and the temperature difference between them by data processing; When quench rates does not meet conditioned disjunction excessive temperature differentials, Controlling System can adjust contact pressure between drip molding and die face and cooling-water flowing speed targetedly according to trigger condition, meet the demands to make the quench rates of hot forming part and drip molding temperature equalisation everywhere, thus ensure that the Strength Mass of final drip molding requires and forming accuracy requirement.
A kind of hot stamping device controlled for hot stamping quenching of the present invention, comprise servo-pressing machine, Press Control System, hot stamping cooling system, comprise punch, die and blank holder hot stamping die, from directly over be connected punch and blank holder and the many groups servo press push rod be fixed in servo-pressing machine; It is characterized in that: be also provided with hot stamping quenching temperature Controlling System, described system is by temperature monitoring system, contact pressure Monitoring systems, and data handling system, contact pressure Controlling System and cooling-water flowing speed control system form jointly; The punch of described hot stamping die is combined by the piecemeal punch of multiple corresponding drip molding feature structure; Each piecemeal punch and be positioned at blank holder outside punch and control by servo press push rod respectively and can move up and down, and mutual movement does not interfere with each other, the most I of mobile accuracy reaches 1mm; Described a kind of effect of hot stamping device controlled for hot stamping quenching ensures in quenching process, ensures that hot forming part quench rates is even, is namely stabilized in (50 ± 8) DEG C/S, control simultaneously drip molding everywhere the temperature difference be less than 50 DEG C.
Described temperature and contact pressure Monitoring systems, data handling system, contact pressure and cooling-water flowing speed control system can form the closed-loop control that controls quenching temperature, under guarantee quenching uniformity condition, realize being uniformly distributed of drip molding temperature; Because the quench rates of the drip molding in quenching process and temperature distribution state are dynamic changes, stablize to maintain it, must be regulated by controlled cooling model water flow velocity and contact pressure, but the change of hot cooling water flow velocity and contact pressure can change quench rates and temperature distribution again; Therefore in order to maintain approximate stable (the changing within the scope of acceptable) of drip molding quench rates and temperature distribution, the closed loop system that is variable with quench rates and the temperature difference must be formed.
Described temperature monitoring system is by measuring the temperature of measurement point selected by hot forming part and mould in real time at die surface and internal layout thermopair, data acquiring frequency is 20 times/second, then by wire, temperature data is passed to data handling system in electrical signal mode; (1) object of Real-Time Monitoring drip molding temperature: is be issued to uniform throughout in order to what ensure quench rates (being obtained by temperature downcurve) meeting rate requirement, namely the scope of quench rates is (50 ± 8) DEG C/S, to guarantee the even formation of martensite of austenite structure; Two is the homogeneities in order to ensure drip molding surface temperature distribution in quenching process, namely requires that the temperature value difference that on drip molding, selected measurement point records at one time is no more than 50 DEG C; (2) object of Real-Time Monitoring die temperature: in order to prevent die temperature too high to affect hot forming part quench rates, require that die temperature maintains under 100 DEG C; In the quenching firm initial stage, because drip molding and the mould temperature difference are comparatively large, amount of heat can pass to mould by drip molding, if water coolant flow velocity is too small, cannot take away most of heat, and die temperature will be caused to rise; But the too high thermal conductivity that can affect between drip molding and mould of die temperature, thus affect quenching velocity, therefore to monitor die temperature and carry out temperature limitation by adjustment water coolant flow velocity.
Describedly should select base surface area in drip molding constitutional features and knuckle region for the thermometric thermopair position of drip molding; Heat transfer coefficient between drip molding and mould can be subject to the impact of contact pressure, and contact pressure is larger, and heat transfer coefficient is larger, and quench rates is higher; Therefore, drip molding meeting different from the contact pressure of die face causes quench rates different, thus causes the generation of the temperature difference; Base surface area in general drip molding feature structure can contact with punch-die simultaneously, and be subject to larger contact pressure, therefore temperature can be lower; And knuckle region is general only contacts with die, the contact force size of itself and die face depends on material properties and the deformation extent of drip molding plate used completely, and therefore the less temperature herein that causes of contact force is higher; Therefore produce plane domain in the feature structure district of gross distortion and knuckle region in will selecting to be shaped as temperature measuring point to arrange thermopair; The thermopair position being wherein in base surface area can obtain the maximum quench rates in its place feature structure, control for triggering contact pressure, and the quench rates being positioned at the thermopair position at knuckle place will lower than base surface area, but be more or less the same, can by the water coolant flow velocity in cooling duct near change to regulate quench rates, the temperature information that the thermopair being therefore positioned at knuckle place obtains is for controlled cooling model water flow velocity.
The described thermopair for Measurement die temperature is arranged in die, and distance die face is 10mm; Because die die face place is maximum temperature place in mould, substantially can represents the maximum temperature of mould near the die face maximum value measured in gained temperature, may be used for follow-up judgement; Be positioned at 10mm place below die face in the preferred die lateral side regions in its position, be conducive to the processing in the hole of laying thermopair.
Described contact pressure Monitoring systems is used for the contact pressure measured in real time between hot forming part and die face, data acquiring frequency is 10 times/second, and by wire, contact pressure information is passed to data handling system, provide decision condition for servo press push rod moving (decompression) and moving down (supercharging); Pressure transmitter in contact pressure Monitoring systems is arranged between servo press push rod and hot stamping die patrix, blank holder, is fixed on die surface and servo push rod keeps in touch; Because servo push rod connects and is fixed on corresponding piecemeal punch and blank holder; piecemeal punch or the contact pressure between blank holder and die are equal to the contact pressure between servo push rod and piecemeal punch or blank holder; therefore; pressure transmitter accurately can be recorded the numerical value of contact pressure by above-mentioned layout, for subsequent control provides precise information.
Described cooling-water flowing speed control system to control the water coolant flow velocity in each cooling duct according to the electrical signal that data handling system transmits by hot stamping cooling system, realize continuity regulate from 0 ~ 3m/s; (1) need the reason regulating water coolant flow velocity: under the condition keeping input temperature of cooling water homeostasis, the flow velocity of water coolant determines the heat can taken away in its unit time; Water coolant flow velocity is larger, the heat that unit time inner mold is lost by thermal convection is larger, die temperature is lower, thus keeping in touch under pressure permanence condition, the heat that hot forming part is transmitted to mould is larger, final drip molding quench rates is larger, and the water coolant flow velocity therefore controlled in different cooling duct can affect the quench rates in corresponding drip molding region to a certain extent; (2) reason controlling each pipeline inner cooling water flow velocity is respectively needed: in order to ensure the homogeneity of quenching, although regulated the rate of cooling that can control drip molding constitutional features base surface area by contact pressure, but because the contact pressure in knuckle region cannot regulate, can only provide and control water coolant flow velocity in corresponding cooling duct to regulate its quench rates, to ensure the quenching uniformity of drip molding entirety.
The electrical signal that described contact pressure Controlling System can transmit according to data handling system, the movement of different servo push rod is regulated by Press Control System, thus control the movement of different piecemeal punch, and then change different piecemeal punch and the contact pressure between drip molding or corresponding die; It is 0 ~ 315KN that contact pressure can realize scope, and control accuracy is 0.1KN; Contact pressure size between drip molding and die face directly affects real contact area therebetween, thus have impact on transmission thermal resistance, and then have impact on quench rates; Contact pressure is larger, and transmit thermal resistance less, the heat that hot forming part flows to mould is more, and drip molding temperature reduction speed is larger, and quench rates is larger; The scope that being undertaken by regulating contact pressure quenches controls is larger, can from 17 DEG C/S ~ 200 DEG C/S, but because the contact pressure of plate each several part and die face is in formation different, contact pressures different during quenching can cause each several part quench rates to differ, therefore need to carry out auxiliary adjustment in conjunction with cooling-water flowing speed control system, avoid drip molding each several part quench rates difference excessive.
Described data handling system will carry out processing and judging after receiving temperature and contact pressure information; After recording temperature and pressure information, (1) selects the temperature maximum in drip molding measurement point; If because drip molding maximum temperature is less than 200 DEG C, then martensitic transformation terminates, then terminate quenching process; Servo press push rod rises, and is convenient to shifting out and the shift-in of high temperature plate of drip molding; (2) calculate the temperature difference on drip molding between measurement point and select maximum value, because when maximum temperature difference reaches 50 DEG C, the temperature distribution representing drip molding differs greatly, then can produce larger thermal stresses in drip molding inside, thus the form accuracy of final drip molding is reduced, surface quality declines; Therefore servo press push rod rises overally, and reduces overall contact pressure, increases the transmission thermal resistance between hot forming part and die face, thus the internal flow being conducive to drip molding heat is to balance drip molding temperature everywhere; Meanwhile, overall water coolant flow velocity is simultaneously stabilized in 3m/s, reduces die temperature, and the uniform heat attracting drip molding, avoids drip molding quench rates to decline too fast; After said process maintains 1 second, data handling system just again reads information and judges, to ensure that hot parts fully can balance own temperature, avoid triggering quench rates adjustment at once because contact pressure reduces to cause quench rates to reduce the excessive system that makes, and cannot ensure that the temperature difference of hot forming part is reduced to suitable temp; (3) quench rates at temperature measuring point place on drip molding is calculated; In order to ensure the homogeneity of quenching, restriction quench rates is within the scope of (50 ± 8) DEG C/S; When the quench rates at temperature measuring point place goes beyond the scope on drip molding, adjust the motion of servo press push rod corresponding to this measurement point place punch according to the size of gained quench rates; Quench rates little then push rod decline Δ H
2, increase contact pressure, increase quench rates; The large then push rod rising Δ H of quench rates
1, reduce contact pressure, reduce quench rates; Wherein Δ H
1with Δ H
2size depend on the difference of quench rates and 50 DEG C/S, difference is larger, Δ H
1with Δ H
2value larger, concrete corresponding relation can be learnt with calculating by experiment; Meanwhile also to regulate the water coolant flow velocity in corresponding pipeline according to the temperature distribution specific aim of drip molding, in order to adjust the quench rates in the uncontrollable region of contact pressure, to ensure drip molding integral quenching homogeneity; (4) temperature maximum in mould measurement point is selected; Because while carry out quenching control to drip molding, because beginning drip molding and the mould temperature difference are very large, amount of heat is transmitted to mould by drip molding and cannot be pulled away due to the restriction of flow rate of water flow, thus makes die temperature increase; And die temperature is too high can affect the heat transfer of drip molding to mould, thus affect quench rates, therefore must control the temperature of mould; Therefore setting is when the maximum temperature of mould measurement point is more than 100 DEG C, then regulate the water coolant flow velocity being positioned at the cooling duct of mold bottom, with restriction and the bulk temperature of stable mould because the stable meeting of die temperature to make contact pressure control the interfering factors of quench rates less.
The punch of described hot stamping die is combined by the piecemeal punch of multiple corresponding drip molding feature structure, and each piecemeal punch is to control by servo press push rod respectively; Because solid punch and die are when contacting, be to ensure that the contact pressure in each region is equal; And by die piecemeal and control respectively, although still cannot ensure that in die face, contact pressure is equal everywhere, at least the contact pressure suffered by whole drip molding can be limited within the scope of an acceptable, thus indirectly ensure the homogeneity of quenching.
Patent of the present invention has the following advantages compared with controlling with existing hot stamping temperature:
(1) contact pressure that pressure control system can be adopted accurately to control between drip molding and die face based on piecemeal punch and servo press push rod, in conjunction with cooling-water flowing speed control system, realize being uniformly distributed of drip molding quench rates, to ensure that final drip molding microtexture is even martensite;
(2) control and water coolant flow rate control in conjunction with contact pressure, can under the condition ensureing quenching uniformity, realize being uniformly distributed of temperature in drip molding quenching process, namely each several part temperature difference is no more than 50 DEG C, avoids producing surface quality and the form accuracy that larger thermal stresses affects final drip molding;
(3) achieved the automatic adjustment of quenching temperature by closed loop control system, improve efficiency, avoid manual operation error.
Accompanying drawing explanation
Fig. 1: hot stamping quench systems structure iron;
Fig. 2: thermopair position figure;
Fig. 3: pressure control device schematic diagram;
Fig. 4: hot stamping quench systems workflow diagram;
Fig. 5: hot stamping quenching control flow chart;
In figure: 1-servo-pressing machine, 2-hot stamping die, 3-servo press push rod, 4-pressure transmitter, 5-is for measuring the thermopair of drip molding temperature, 6-is used for the thermopair of Measurement die temperature, 7-blank holder, 8-piecemeal punch A, 9-piecemeal punch B, 10-die, 11-is for controlling the cooling duct quenched, 12-is for controlling the cooling duct of die temperature, 13-drip molding, 14-Press Control System, 15-hot stamping cooling system, 16-temperature monitoring system, 17-contact pressure Monitoring systems, 18-data handling system, 19-contact pressure Controlling System, 20-cooling-water flowing speed control system, , I-hot stamping quenching temperature Controlling System.
Specific embodiments
Below by example contrast accompanying drawing, further illustrate concrete structure of the present invention and embodiment thereof:
As shown in Figure 1, a kind of hot stamping quenching temperature Controlling System of the present invention and supporting pressure control device thereof, form primarily of servo-pressing machine 1, Press Control System 14, hot stamping cooling system 15, hot stamping die 2 and hot stamping quenching temperature Controlling System I; Described hot stamping quenching temperature Controlling System I comprises temperature monitoring system 16, contact pressure Monitoring systems 17, data handling system, contact pressure Controlling System 19 and cooling-water flowing speed control system 20.
As shown in Figure 2, for a specified shape drip molding, the layout of associated hot galvanic couple is described;
For measuring the thermopair 5 of drip molding 13 temperature, because thermal self-restraint stress and temperature minimum point in drip molding 13 must be measured, and the bottom surface of feature structure contact pressure maximum often in drip molding 13, be also quench rates maximum, the minimum place of temperature; In drip molding 13 feature structure the contact pressure at knuckle place often minimum, quench rates is minimum, is also maximum temperature place; Therefore, die face corresponds to drip molding 13 feature structure base surface area and the punching of knuckle region, stationary heat galvanic couple 5, and when will ensure quenching, thermopair 5 contacts with drip molding.
For the thermopair 6 of Measurement die temperature, due to the material manufacture that hot stamping die often adopts thermal conductivity higher, the heat flow therefore in mould is easy, and therefore temperature homogeneity is better, the temperature difference is little everywhere, but is still highest temperature area near the die face enclosure region of drip molding 13; Therefore thermopair 6 is arranged in the position of 10mm under die face, one excessively can not affect mould strength, two be can approximate measure to the temperature of die face; Be positioned at 10mm place below die face in the preferred die lateral side regions in position of thermopair 6, be conducive to the processing in the hole of laying thermopair, around the punching of mould side to arrange that 3 ~ 4 thermopairs are used for Measurement die temperature.
As shown in Figure 3, for a specified shape drip molding, the structure of related pressure control device is described:
Punch carries out piecemeal according to constitutional features, is piecemeal punch A8 and piecemeal punch B9, and is fixedly connected with respectively at servo press push rod 3; Blank holder 7 around punch is also fixedly connected with servo press push rod 3; It is inner that servo press push rod 3 is fixed on servo-pressing machine 1, and can be controlled the motion of each push rod by Press Control System 14, mobile accuracy can reach 1mm; Piecemeal punch 8,9 is fixed on and junction between blank holder 7 and servo press push rod 3 for what measure the pressure transmitter 4 of contact pressure, thus can the change of accurate measuring stress; In cooling duct in die 10, affect by die face for cooling duct 11 arrangement controlling to quench; Cooling duct 12 for controlling die temperature is arranged in female bottom; The hot-work die steel making that punch and matrix and blank holder all adopt thermal conductivity higher.
The workflow of whole system is as shown in Figure 4, specific as follows:
After quenching starts, temperature monitoring system 16 and contact pressure Monitoring systems 17 record the contact pressure information between drip molding temperature, die temperature, punch-die by pressure transmitter 4, thermopair 5 and 6, then it is passed to data handling system 18 by wire in electrical signal form, judge after data handling system 18 process information, if judge successfully, send electrical signal by wire to follow-up Controlling System by setting in early stage and regulate and control; Contact pressure Controlling System 19 regulates the movement of servo press push rod 3 to change drip molding 13, contact pressure between punch 8,9 and die 10 by Press Control System 14 after receiving electrical signal; Cooling-water flowing speed control system 20 regulates the water coolant flow velocity in hot stamping die 2 in different cooling duct by hot stamping cooling system 15 after receiving electrical signal; Integrated exposure pressure-controlling and water coolant flow rate control, quench rates is stabilized within the scope of (50 ± 8) DEG C/S, and the drip molding temperature difference is stabilized within 50 DEG C, until quenching terminates.
The quenching control flow of hot forming part is as shown in Figure 5, specific as follows:
Due to forming process convex mould entire lowering, thus different from the contact pressure of drip molding 13, cause the temperature decrease rate of drip molding 13 different; Therefore, when quenching starts, the quench rates of drip molding 13 is uneven and the temperature difference is larger everywhere; After quenching starts, the temperature value at thermopair 5 place can be learnt by temperature monitoring system 16, and by calculating the quench rates of each point; The rear contact pressure between each piecemeal punch 8,9 and die 10 that is shaped can be learnt by contact pressure Monitoring systems 17;
(1) first quench rates is regulated: by data handling system 18 known thermopair 5(measurement point) quench rates everywhere, the quench rates being in the measurement point of base surface area and (50 ± 8) DEG C/S is contrasted, afterwards according to the servo press push rod 3 that comparing result regulates the corresponding piecemeal punch 8,9 in this measurement point place place to connect; Be greater than this scope, then servo press push rod 3 move to reduce contact pressure, thus reduce quench rates; Be in this scope, then servo press push rod 3 keeps motionless; Be less than this scope, then servo press push rod 3 moves down to increase contact pressure, increases quench rates; And the quench rates being in the measurement point at knuckle place and (50 ± 8) DEG C/S contrasts, be less than, increase the water coolant flow velocity in corresponding cooling duct 11, be greater than, reduce the water coolant flow velocity in corresponding cooling duct 11, be in, remain unchanged;
(2) after meeting quench rates requirement, start to regulate drip molding 13 temperature distribution; Only pipe quench rates is stabilized in certain area, but carries out along with quenching, and drip molding 13 temperature difference everywhere can increase gradually, and final trigger temperatures homogeneity regulates; When there being the maximum temperature difference between each measurement point more than 50 DEG C, all servo press push rods 3 rise overally, and all water coolant flow rate regulation are to maximum simultaneously, and after maintaining 1 second, data handling system restarts to carry out triggering again and judges;
(3) while drip molding 13 being carried out to quenching control, die 10 temperature rises, and when its maximum temperature reaches 100 DEG C, the water coolant flow velocity controlling the cooling duct 12 be positioned at bottom die 10 changes at 1 ~ 3m/s, to control the temperature of die 10;
(4) so in the circulation of " Information Monitoring-judgement-feedback regulation ", drip molding 13 maximum temperature is reduced to less than 200 DEG C, then end of quenching; Servo press push rod 3 rises overally, and water coolant flow velocity remains on 2m/s.
Claims (6)
1. the hot stamping device for control of quenching, comprise servo-pressing machine, Press Control System, hot stamping cooling system, comprise punch, die and blank holder hot stamping die, from directly over be connected punch and blank holder and the many groups servo press push rod be fixed in servo-pressing machine, it is characterized in that: be also provided with hot stamping quenching temperature Controlling System, described system is by temperature monitoring system, contact pressure Monitoring systems, and data handling system, contact pressure Controlling System and cooling-water flowing speed control system form; Wherein temperature monitoring system and contact pressure Monitoring systems are by being arranged on thermopair on hot stamping die and pressure transmitter carries out information gathering, be in parallel, do not interfere with each other state, by gained information in electrical signal form by wire transmission to data handling system; Data handling system is carried out information processing and after analyzing, is carried out feedback and trigger judgement, sets up, then send electrical signal by wire respectively to contact pressure Controlling System and cooling-water flowing speed control system if judge; Contact pressure Controlling System is for controlling the contact pressure between hot forming part and die face, cooling-water flowing speed control system controls the flow velocity of hot stamping die inner cooling water by hot stamping cooling system, both are for walking abreast, not interfereing with each other state, the comprehensive control realized for quenching temperature; The punch of described hot stamping die is combined by the piecemeal punch of multiple corresponding drip molding feature structure; Each piecemeal punch and be positioned at blank holder outside punch and control by servo press push rod respectively and can move up and down, and mutual movement does not interfere with each other, the most I of mobile accuracy reaches 1mm; Described hot stamping quenching temperature Controlling System and supporting pressure control device thereof ensure that, in quenching process, hot forming part quench rates is even, are namely stabilized in (50 ± 8) DEG C/S, control simultaneously drip molding everywhere the temperature difference be less than 50 DEG C.
2. a kind of for the hot stamping device controlled that quenches as claimed in claim 1, it is characterized in that: temperature and contact pressure Monitoring systems, data handling system, contact pressure and cooling-water flowing speed control system form the closed-loop control that can be formed quenching temperature, realize the control of quenching temperature; Be specially: based on the quench rates in the quenching process that correlation-detection system obtains and and temperature differential information determine the operation of contact pressure and cooling-water flowing speed control system by data handling system, and the operation of Controlling System can by controlled cooling model water flow velocity and press slide motion effects drip molding quench rates and the temperature difference, formation like this one with quench rates and the temperature difference be variable, process be " input-process-feedback-export " closed loop control system, the Dynamic controlling for drip molding quenching uniformity and temperature distribution evenness can be realized.
3. a kind of for the hot stamping device controlled that quenches as claimed in claim 1, it is characterized in that: described temperature monitoring system can gather the temperature information of drip molding and mould by thermopair; Position wherein for measuring the thermopair of drip molding temperature generally selects the base surface area in the feature structure of drip molding and knuckle region place to arrange thermopair as temperature measuring point, and the thermopair for monitoring drip molding temperature is fixed on hot stamping die molding surface, keep in touch with drip molding surface in quenching process; Position wherein for the thermopair of Measurement die temperature is positioned at 10mm place below die die face; In the thermopair for measuring drip molding temperature, be in the temperature information of the thermopair collection of base surface area for controlling contact pressure, and the information that the thermopair being positioned at transition circle angular region gathers is for controlled cooling model water flow velocity.
4. a kind of for the hot stamping device controlled that quenches as claimed in claim 4, it is characterized in that: be positioned at 10mm place below die face in the preferred die lateral side regions of position of the described thermopair for Measurement die temperature, be conducive to the processing in the hole of laying thermopair.
5. a kind of for the hot stamping device controlled that quenches as claimed in claim 1, it is characterized in that: the mode of described data handling system process information is the temperature and pressure information that (1) record monitoring system transmits; (2) maximum temperature value on drip molding in measurement point is screened; (3) calculate the temperature difference on drip molding between measurement point, select the maximum value of the temperature difference; (4) quench rates at temperature measuring point place on drip molding is calculated; (5) maximum on mould in measurement point gained temperature is screened.
6. a kind of for the hot stamping device controlled that quenches as claimed in claim 1, it is characterized in that: the decision condition in described data handling system and Feedback mechanism are for (1) drip molding top temperature is lower than 200 DEG C, then quench end, servo press push rod rises overally; (2) when in drip molding constitutional features, the quench rates of the temperature measuring point at bottom surface place is not within the scope of (50 ± 8) DEG C/S, the motion of servo press push rod corresponding to this measurement point place punch is adjusted according to the size of gained quench rates, quench rates is too small, and push rod declines and improves quench rates to increase contact pressure, and quench rates is excessive, and push rod rises and reduces quench rates to reduce contact pressure; (3) when in drip molding constitutional features, the quench rates of the temperature measuring point at knuckle place is not within the scope of (50 ± 8) DEG C/S, the water coolant flow velocity in corresponding cooling duct is adjusted according to the size of gained quench rates, the too small then flow velocity of quench rates increases and improves quench rates, and quench rates is excessive, and flow velocity reduces to reduce quench rates; (4) when the maximum temperature difference between temperature measuring points all on drip molding reaches 50 DEG C, servo press push rod rises overally to reduce contact pressure to increase slab interior thermal exchange, and overall water coolant flow velocity is stabilized in 3m/s simultaneously; (5) when the maximum temperature of mould measurement point is more than 100 DEG C, regulate and be positioned at the water coolant flow velocity of the cooling duct of mold bottom, by mould everywhere in maximum temperature be stabilized in 100 DEG C.
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| CN201410410577.XA CN104294020B (en) | 2014-08-20 | 2014-08-20 | A kind of for the hot stamping device controlled that quenches |
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| CN201410410577.XA CN104294020B (en) | 2014-08-20 | 2014-08-20 | A kind of for the hot stamping device controlled that quenches |
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Cited By (4)
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| CN107971411A (en) * | 2016-10-21 | 2018-05-01 | 福特汽车公司 | Method for the quality for monitoring hot stamping part |
| CN113642218A (en) * | 2021-08-18 | 2021-11-12 | 南京钢铁股份有限公司 | System and method for determining critical heating rate of steel plate quenching treatment |
| CN114544698A (en) * | 2022-02-10 | 2022-05-27 | 大连理工大学 | Device and method for testing heat transfer coefficient of die-pipe fitting interface in hot air pressure forming process |
| US11427879B2 (en) | 2018-05-02 | 2022-08-30 | Ford Global Technologies, Llc | Die construction methodology for reducing quench time for press hardenable steels |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3567126A1 (en) * | 2018-05-07 | 2019-11-13 | Casa Maristas Azterlan | System and method of quenching monitoring during steel hot stamping |
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| CN113642218A (en) * | 2021-08-18 | 2021-11-12 | 南京钢铁股份有限公司 | System and method for determining critical heating rate of steel plate quenching treatment |
| CN113642218B (en) * | 2021-08-18 | 2023-12-15 | 南京钢铁股份有限公司 | Determination system and determination method for critical heating rate of steel plate quenching treatment |
| CN114544698A (en) * | 2022-02-10 | 2022-05-27 | 大连理工大学 | Device and method for testing heat transfer coefficient of die-pipe fitting interface in hot air pressure forming process |
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| CN104294020B (en) | 2016-11-23 |
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