CN104831020A - Method for stamping quenching molding in non-uniform temperature field - Google Patents
Method for stamping quenching molding in non-uniform temperature field Download PDFInfo
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- CN104831020A CN104831020A CN201510162842.1A CN201510162842A CN104831020A CN 104831020 A CN104831020 A CN 104831020A CN 201510162842 A CN201510162842 A CN 201510162842A CN 104831020 A CN104831020 A CN 104831020A
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Abstract
The invention discloses a method for stamping quenching molding in a non-uniform temperature field. The method comprises the following steps of 1, heating raw plate materials in a heating furnace, 2, transferring the raw plate materials into a stamping quenching mold of a press machine, 3, feeding cooling water into a cooling pipe of the stamping quenching mold from a water inlet of the cooling pipe, 4, carrying out cooling, wherein the temperature of the cooling water is continuously increased along with increasing of a cooling water flowing distance and the molded plate has a martensite, ferrite and pearlite mixed microstructure, and 5, discharging the cooling water in the cooling pipe of the stamping quenching mold from a water outlet, wherein after discharge, the temperature of the cooling water is heated to 130 DEG C and the molded plate has a martensite, ferrite and pearlite mixed microstructure. In a stamping quenching process, the method gradiently changes the plate strength, is free of change of an original structure design of a mold, has simple processes and reduces a production cost.
Description
Technical field the invention belongs to the quenching formed field of punching press.
Background technology automobile making is the mainstay industry of Chinese national economy, the development trend of automotive light weight technology makes ultrastrength material application increasingly extensive, the progressively popularization of ultrahigh-strength steel plates in automobile industry, brings a series of challenge newly to existing sheet forming technique.Existing is that plate entirety is heated to certain proper temperature of more than recrystallization temperature based on the quenching formed technique of homogeneous temperature field punching press, carry out stamping after making its complete austenitizing, quench treatment is to obtain the stamping parts at room temperature with even martensitic stucture simultaneously, the ultrahigh-strength steel plates overall mechanical properties be shaped in punching press quenching mould is identical, what after being shaped, part obtained is organized as whole martensite, and some parts needs different intensity to reach performance requriements on vehicle body, such as vehicle body important safety part B post (see Fig. 1), lower intensity is needed to play the effect of buffering energy-absorbing in lower part of B post, the safety of driver and crew in protection car, this just needs the intensity of material to be depth-graded distribution, reach the requirement of intensity adjustable, and existing intensity adjustable manufacturing process is by changing the distribution of mould inside cooling duct, the performance realizing material by applying thermal barrier coating on mould is continuous gradient change.Its weak point: actually operating is more difficult, needs the primary formation design changing mould, considerably increases production cost.
Summary of the invention the object of this invention is to provide one can realize plate intensity in punching press quenching process be depth-graded change, and do not need the primary formation design changing mould, method is simple, the quenching formed method of punching press under the non-uniform temperature field of reduction production cost.
A kind of quenching formed method of punching press under non-uniform temperature field, comprises the steps:
(1) original plate is the common high-strength steel of about tensile strength 600MPa, original plate first heats with the rate of heating of 20 DEG C/s in vacuum furnace, Heating temperature is 880 DEG C, 3 ~ 5 minutes time, to ensure that the whole structural transformation of punching press quenching part is for austenite, and crystal grain is unlikely too thick;
(2) after heating, rapidly plate is moved in the punching press quenching mould of pressing machine, this punching press quenching mould is matched by punch and die, high spot near punch is provided with some radial cooling ducts, recess near die is provided with some radial cooling ducts), because plate has energy expenditure in transfer process, plate initial formation temperature in punching press quenching mould is about 850 DEG C, and mould and cooling duct inner cooling water initial temperature are 25 DEG C;
(3) in punching press quenching process, water coolant is in the cooling duct of punching press quenching mould, flow into from the water inlet of cooling duct, with the flowing of 0.05m/s ~ 1m/s speed, be greater than 27 DEG C/s to the speed of cooling of plate, after shaping, this part is organized as the higher lath martensite tissue of intensity, play strengthening effect, tensile strength reaches about 1600MPa, meets the requirement that B post first half intensity is higher, and the corresponding zone of punching press quenching mould is stiffened region;
(4) temperature in punching press quenching mould cooling duct is along with the increase of flow of cooling water distance, temperature of cooling water constantly raises, be increased to 120 DEG C, when martensitic critical transitions speed 27 DEG C/s is equaled to the speed of cooling of plate, plate after shaping is martensite, ferrite, pearlitic structure, have good toughness, tensile strength is at about 1000MPa, and the corresponding zone of punching press quenching mould is zone of transition;
(5) water coolant in punching press quenching mould cooling duct is after mould water outlet flows out, temperature of cooling water is increased to 130 DEG C, to the declines that cools of plate, to the speed of cooling of plate lower than martensitic velocity of transformation 27 DEG C/s, after being shaped, plate is perlite, the mixed structure of ferrite composition, tensile strength is at about 500MPa, play ramollescence, due to ferrite, perlite has good plasticity and ductility, the effect of buffering energy-absorbing can be played in the process collided, meet the requirement that automobile B-column lower part plasticity is higher, the corresponding zone of punching press quenching mould is softened zone.
Compared with prior art, tool of the present invention has the following advantages: by the quenching formed technique of punching press under a kind of non-uniform temperature field, the intensity of B post can be realized, plasticity is continuous gradient distribution, the tensile strength of final formation product is in 500MPa ~ 1600MPa continuous distribution, by means of the feature that its soft or hard combines, namely the feature that outer soft materials serve unit elongation is large makes the large martensite of internal layer intensity be unlikely to too early inefficacy, there is higher energy absorption ability, can either reach requirement of strength has again certain viscous deformation interval, the intensity of steel plate is ensured again endergonic while, decrease the welding of steel plate, the interconnection techniques such as riveted joint, greatly can improve the design space of material, can realize plate intensity in punching press quenching process is depth-graded change, and do not need the primary formation design changing mould, method is simple, reduce production cost.
Accompanying drawing explanation
Fig. 1 is automobile B-column part schematic diagram;
Fig. 2 is the quenching formed method schematic diagram of punching press under a kind of non-uniform temperature field of the present invention.
Embodiment
Wherein, 1 is flow of cooling water velocity reversal, and 2 is stiffened region, and 3 is zone of transition, and 4 is softened zone.
Embodiment 1
A kind of quenching formed method of punching press under non-uniform temperature field, comprises the steps:
(1) original plate is the common high-strength steel of tensile strength 600MPa, original plate first heats with the rate of heating of 20 DEG C/s in vacuum furnace, Heating temperature is 880 DEG C, 3 minutes time, to ensure that the whole structural transformation of punching press quenching part is for austenite, and crystal grain is unlikely too thick;
(2) after heating, rapidly plate is moved in the punching press quenching mould of pressing machine, this punching press quenching mould is matched by punch and die, high spot near punch is provided with radial cooling duct, recess near die is provided with some radial cooling ducts), because plate has energy expenditure in transfer process, plate initial formation temperature in punching press quenching mould is 850 DEG C, and mould and cooling duct inner cooling water initial temperature are 25 DEG C;
(3) in punching press quenching process, water coolant is in the cooling duct of punching press quenching mould, flow into from the water inlet of cooling duct, with the flowing of 0.05m/s speed, be greater than 27 DEG C/s to the speed of cooling of plate, after shaping, this part is organized as the higher lath martensite tissue of intensity, play strengthening effect, tensile strength reaches 1600MPa, meets the requirement that B post first half intensity is higher, and the corresponding zone of punching press quenching mould is stiffened region 2;
(4) temperature in punching press quenching mould cooling duct is along with the increase of flow of cooling water distance, temperature of cooling water constantly raises, be increased to 120 DEG C, when martensitic critical transitions speed 27 DEG C/s is equaled to the speed of cooling of plate, plate after shaping is martensite, ferrite, pearlitic structure, have good toughness, tensile strength is at about 1000MPa, and the corresponding zone of punching press quenching mould is zone of transition 3;
(5) water coolant in punching press quenching mould cooling duct is after mould water outlet flows out, temperature of cooling water is increased to 130 DEG C, to the declines that cools of plate, to the speed of cooling of plate lower than martensitic velocity of transformation 27 DEG C/s, after being shaped, plate is perlite, the mixed structure of ferrite composition, tensile strength is at about 500MPa, play ramollescence, due to ferrite, perlite has good plasticity and ductility, the effect of buffering energy-absorbing can be played in the process collided, meet the requirement that automobile B-column lower part plasticity is higher, the corresponding zone of punching press quenching mould is softened zone 4.
Embodiment 2
A kind of quenching formed method of punching press under non-uniform temperature field, comprises the steps:
(1) original plate is the common high-strength steel of tensile strength 600MPa, original plate first heats with the rate of heating of 20 DEG C/s in vacuum furnace, Heating temperature is 880 DEG C, 5 minutes time, to ensure that the whole structural transformation of punching press quenching part is for austenite, and crystal grain is unlikely too thick;
(2) after heating, rapidly plate is moved in the punching press quenching mould of pressing machine, this punching press quenching mould is matched by punch and die, high spot near punch is provided with radial cooling duct, recess near die is provided with some radial cooling ducts), because plate has energy expenditure in transfer process, plate initial formation temperature in punching press quenching mould is 850 DEG C, and mould and cooling duct inner cooling water initial temperature are 25 DEG C;
(3) in punching press quenching process, water coolant is in the cooling duct of punching press quenching mould, flow into from the water inlet of cooling duct, with the flowing of 1m/s speed, be greater than 27 DEG C/s to the speed of cooling of plate, after shaping, this part is organized as the higher lath martensite tissue of intensity, play strengthening effect, tensile strength reaches 1600MPa, meets the requirement that B post first half intensity is higher, and the corresponding zone of punching press quenching mould is stiffened region 2;
(4) temperature in punching press quenching mould cooling duct is along with the increase of flow of cooling water distance, temperature of cooling water constantly raises, be increased to 120 DEG C, when martensitic critical transitions speed 27 DEG C/s is equaled to the speed of cooling of plate, plate after shaping is martensite, ferrite, pearlitic structure, have good toughness, tensile strength is at about 1000MPa, and the corresponding zone of punching press quenching mould is zone of transition 3;
(5) water coolant in punching press quenching mould cooling duct is after mould water outlet flows out, temperature of cooling water is increased to 130 DEG C, to the declines that cools of plate, to the speed of cooling of plate lower than martensitic velocity of transformation 27 DEG C/s, after being shaped, plate is perlite, the mixed structure of ferrite composition, tensile strength is at about 500MPa, play ramollescence, due to ferrite, perlite has good plasticity and ductility, the effect of buffering energy-absorbing can be played in the process collided, meet the requirement that automobile B-column lower part plasticity is higher, the corresponding zone of punching press quenching mould is softened zone 4.
Claims (1)
1. the quenching formed method of punching press under non-uniform temperature field, is characterized in that: a kind of quenching formed method of punching press under non-uniform temperature field, comprises the steps:
(1) original plate is the common high-strength steel of about tensile strength 600MPa, original plate first heats with the rate of heating of 20 DEG C/s in vacuum furnace, Heating temperature is 880 DEG C, 3 ~ 5 minutes time, to ensure that the whole structural transformation of punching press quenching part is for austenite, and crystal grain is unlikely too thick;
(2) after heating, rapidly plate is moved in the punching press quenching mould of pressing machine, this punching press quenching mould is matched by punch and die, high spot near punch is provided with radial cooling duct, recess near die is provided with some radial cooling ducts), because plate has energy expenditure in transfer process, plate initial formation temperature in punching press quenching mould is about 850 DEG C, and mould and cooling duct inner cooling water initial temperature are 25 DEG C;
(3) in punching press quenching process, water coolant is in the cooling duct of punching press quenching mould, flow into from the water inlet of cooling duct, with the flowing of 0.05m/s ~ 1m/s speed, be greater than 27 DEG C/s to the speed of cooling of plate, after shaping, this part is organized as the higher lath martensite tissue of intensity, play strengthening effect, tensile strength reaches about 1600MPa, meets the requirement that B post first half intensity is higher, and the corresponding zone of punching press quenching mould is stiffened region;
(4) temperature in punching press quenching mould cooling duct is along with the increase of flow of cooling water distance, temperature of cooling water constantly raises, be increased to 120 DEG C, when martensitic critical transitions speed 27 DEG C/s is equaled to the speed of cooling of plate, plate after shaping is martensite, ferrite, pearlitic structure, have good toughness, tensile strength is at about 1000MPa, and the corresponding zone of punching press quenching mould is zone of transition;
(5) water coolant in punching press quenching mould cooling duct is after mould water outlet flows out, temperature of cooling water is increased to 130 DEG C, to the declines that cools of plate, to the speed of cooling of plate lower than martensitic velocity of transformation 27 DEG C/s, after being shaped, plate is perlite, the mixed structure of ferrite composition, tensile strength is at about 500MPa, play ramollescence, due to ferrite, perlite has good plasticity and ductility, the effect of buffering energy-absorbing can be played in the process collided, meet the requirement that automobile B-column lower part plasticity is higher, the corresponding zone of punching press quenching mould is softened zone.
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| CN105905168A (en) * | 2016-04-22 | 2016-08-31 | 北京新能源汽车股份有限公司 | Side-frame outer plate manufacturing method |
| CN106119688A (en) * | 2016-07-22 | 2016-11-16 | 大连理工大学 | A kind of high intensity Q ＆ P steel part preparation method of capability gradient distribution |
| WO2017219427A1 (en) | 2015-12-04 | 2017-12-28 | 重庆哈工易成形钢铁科技有限公司 | Treatment process for obtaining graded performance and member thereof |
| WO2020113844A1 (en) * | 2018-12-06 | 2020-06-11 | 苏州普热斯勒先进成型技术有限公司 | Method and device for preparing corrosion-resistant hot stamping part |
| CN113802065A (en) * | 2021-11-18 | 2021-12-17 | 育材堂（苏州）材料科技有限公司 | Hot press-formed member, steel sheet for hot press forming, and hot press process |
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| WO2017219427A1 (en) | 2015-12-04 | 2017-12-28 | 重庆哈工易成形钢铁科技有限公司 | Treatment process for obtaining graded performance and member thereof |
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| CN106119688B (en) * | 2016-07-22 | 2017-11-10 | 大连理工大学 | A kind of high intensity Q ＆ P steel part preparation methods of capability gradient distribution |
| WO2020113844A1 (en) * | 2018-12-06 | 2020-06-11 | 苏州普热斯勒先进成型技术有限公司 | Method and device for preparing corrosion-resistant hot stamping part |
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| CN113802065B (en) * | 2021-11-18 | 2022-03-29 | 育材堂（苏州）材料科技有限公司 | Hot press-formed member, steel sheet for hot press forming, and hot press process |
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