CN103028645A - Hot stamping forming method for variable strength distribution strong-strength steel plate part - Google Patents
Hot stamping forming method for variable strength distribution strong-strength steel plate part Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
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Abstract
The invention discloses a hot stamping forming method for a variable strength distribution strong-strength steel plate part, relates to a hot-stamping forming method for a strong-strength steel plate part, and aims to solve the problems of difficulty in the effective adjustment of strength of different parts and incapability of obtaining rational strength distribution in a hot stamping forming process of a strong-strength steel plate. The method comprises the following steps of: 1, placing a strong-strength steel plate blank to be formed into a heater, and performing zonal control on first, second and third zones of the heater by correspondingly adopting different or the same heating temperature and different or the same heating time; 2, quickly transferring the heated strong-strength steel plate blank into a forming die within 3 to 5 seconds, quickly closing the forming die, and forming the strong-strength steel plate blank within 1 to 3 seconds; 3, keeping the forming die closed, and introducing cooling water into cooling holes in the forming die to reduce the temperature of the forming die to quench the strong-strength steel plate part; and 4, after the quenching is completed, opening the forming die, and taking out the obtained strong-strength steel plate part. The method is used for the hot forming of the strong-strength steel plate.
Description
Technical field
The present invention relates to the hot press-formed method of a kind of high-strength steel sheet material part, be specifically related to a kind of hot press-formed method of intensity adjustable distribution high-strength steel sheet material part.
Background technology
High-strength steel be used as a kind of light material in a plurality of fields particularly auto manufacturing be widely applied.High-strength steel is divided into two classes, one class is that material itself has higher intensity, after being configured as part, do not need maybe cannot carry out subsequent reinforced, such as two-phase (DP) steel, phase-change induced plastic (TRIP) steel, martensite (M) steel, complex phase (CP) steel etc.; Another kind of is that the intensity of material own is not high, can obtain very high intensity by operations such as quenchings after being configured as part, such as hot forming (HF) steel.The hot forming steel is a kind of martensitic steel of hardenable one-tenth of boracic, claims again boron steel.Make the blank complete austenitizing by heating before being shaped, then quench to obtain whole martensitic structures at cold mould internal shaping and in mould, tensile strength can reach 1500MPa even higher.Domestic boron steel is take the BR1500HS of Baosteel production as representative, and the external corresponding trade mark is 22MnB5.
For part complex-shaped, integration, its combination property also has very high requirement, is namely obtaining the high-intensity while, needs part integral body or part to have enough plasticity or toughness toward contact, to satisfy the requirement of the aspects such as collision, connection.At this moment, just need suitably to reduce the intensity of corresponding site on the part.For the hot forming steel board, China Patent No. is 201110126218.8, open day be that on 05 16th, 2011 patent of invention discloses flexible hot press-formed auto parts and the control method thereof that distributes of a kind of intensity, the forming process of this patent is by the Cooling Quenching speed of different parts on the control part, realizes control and the adjustment of intensity distributions.But, because hot press-formed process is finished usually, be difficult to realize in a short period of time the regulation and control of Cooling Quenching speed within the several seconds, can't obtain reasonable intensity distributions.
Summary of the invention
The objective of the invention is to be difficult to the intensity of different parts is effectively regulated, can't be obtained the problem of reasonable intensity distributions for solving in the hot press-formed process of high-strength steel sheet material, and a kind of hot press-formed method of intensity adjustable distribution high-strength steel sheet material part is provided.
Method of the present invention realizes by following steps:
Step 1, high-strength steel slab to be formed is put into heater, the high-strength steel slab is divided into several zones along its length, several zones are respectively a district, He San district, two districts, the district that heater is corresponding, He San district, two districts adopt similar and different heating-up temperature to carry out subregion control, and the district that heater is corresponding, He San district, two districts adopt and carry out subregion control similar and different heat time heating time;
The present invention compared with prior art has following effect:
One, the present invention makes the austenitizing degree of zones of different slab different by the zones of different on the high-strength steel slab being carried out subregion control heating, thereby realizes control and adjusting to high-strength steel sheet material part strength after the final shaping.The present invention can make high-strength steel sheet material part obtain reasonable intensity distributions.Two, when heating, heating-up temperature and the heat time heating time of control high-strength steel slab zones of different all can change the austenitizing degree of corresponding site, thereby after shaping, obtain different microstructures and intensity, technique is simple and easy to realize; The austenitizing degree of different parts can not suddenlyd change when three, heating, and therefore the intensity distributions of part is also relatively mild after quenching, has avoided the wall thickness of traditional welding plate material parts, the problem of Intensity Abrupt, and the whole mechanical property of part is better; Need not subregion when four, being shaped or accurately control the cooling condition of each regional mould, mould structure of the present invention is simple, cost is low, and curring time is short, efficient is high.
Description of drawings
Fig. 1 is the implementation process schematic diagram of step 1 in the specific embodiment of the present invention one; Fig. 2 is the implementation process schematic diagram of step 2 in the specific embodiment of the present invention one; Fig. 3 is the implementation process schematic diagram of step 3 in the specific embodiment of the present invention one; Fig. 4 is the implementation process schematic diagram of step 1 a in the specific embodiment of the present invention nine; Fig. 5 is the implementation process schematic diagram of step 1 b in the specific embodiment of the present invention ten.
The specific embodiment
The specific embodiment one: the performing step that specifies present embodiment in conjunction with Fig. 1～Fig. 3:
Step 1, high-strength steel slab 1 to be formed is put into heater 2, high-strength steel slab 1 is divided into several zones along its length, several zones are respectively a district A, two districts B He San district C, one district A of heater 2 correspondences, two districts B He San district C adopt similar and different heating-up temperature to carry out subregion control, and a district A of heater 2 correspondences, two districts B He San district C adopt and carry out subregion control similar and different heat time heating time;
High-strength steel slab 1 adopts boron steel, and mainly by its martensite content decision, martensite content is higher for the intensity after 1 hot forming of high-strength steel slab, and intensity is also higher.And to obtain martensitic structure, need material to cool off with sufficiently high cooling velocity (critical quenching rate) from sufficiently high temperature (critical hardening temperature) at austenitic state.In other words, the initial austenite degree of material, Cooling Quenching condition have direct impact to quenching effect and the final intensity of part.The present invention is just from changing the initial austenite degree of material, by heating-up temperature and the heat time heating time of different parts on the control slab, to reach the purpose of the final plate material parts intensity distributions of control.
The specific embodiment two: present embodiment is described in conjunction with Fig. 1, one district A of heater 2 correspondences in the step 1 of present embodiment, two districts B He San district C adopt and carry out subregion control different heating-up temperature, identical heat time heating times, the regional heating-up temperature that the high regional heating-up temperature of high-strength steel slab 1 requirement of strength is 850 ℃～1000 ℃, requirement of strength is low in the step 1 is 700 ℃～850 ℃, is 3min～6min the regional heat time heating time that the zone that requirement of strength is high and requirement of strength are low.The division in the zone that the zone that requirement of strength is high and requirement of strength are low is to divide according to the needs of part.In the present embodiment, the heating-up temperature by zones of different on the control high-strength steel slab 1 is to obtain different austenitizing degree.Only needing during enforcement that heater 2 is carried out the subregion temperature control can achieve the above object, and method is simple.Other step is identical with the specific embodiment one.
The specific embodiment three: present embodiment is described in conjunction with Fig. 1, the regional heating-up temperature that the high regional heating-up temperature of high-strength steel slab 1 requirement of strength is 900 ℃, requirement of strength is low in the step 1 of present embodiment is 750 ℃, is 5min the regional heat time heating time that the zone that requirement of strength is high and requirement of strength are low.In the present embodiment, the heating-up temperature by zones of different on the control high-strength steel slab 1 is to obtain different austenitizing degree.Only needing during enforcement that heater 2 is carried out the subregion temperature control can achieve the above object, and method is simple.Other step is identical with the specific embodiment two.
The specific embodiment four: present embodiment is described in conjunction with Fig. 1, the regional heating-up temperature that the high regional heating-up temperature of high-strength steel slab 1 requirement of strength is 950 ℃, requirement of strength is low in the step 1 of present embodiment is 800 ℃, is 4min the regional heat time heating time that the zone that requirement of strength is high and requirement of strength are low.In the present embodiment, the heating-up temperature by zones of different on the control high-strength steel slab 1 is to obtain different austenitizing degree.Only needing during enforcement that heater 2 is carried out the subregion temperature control can achieve the above object, and method is simple.Other step is identical with the specific embodiment two.
The specific embodiment five: present embodiment is described in conjunction with Fig. 1, one district A of heater 2 correspondences in the step 1 of present embodiment, two districts B He San district C adopt and carry out subregion control identical heating-up temperature, different heat time heating times, high-strength steel slab 1 requirement of strength in the step 1 is that 3min～6min, requirement of strength low regional heat time heating time is 1min～3min high regional heat time heating time, and the regional heating-up temperature that the zone that requirement of strength is high and requirement of strength are low is 850 ℃～1000 ℃.In the present embodiment, the heat time heating time by zones of different on the control high-strength steel slab 1 is to obtain different austenitizing degree.Only need during enforcement that heater 2 is carried out subregion control and can achieve the above object heat time heating time, method is simple.Other step is identical with the specific embodiment one.
The specific embodiment six: present embodiment is described in conjunction with Fig. 1, high-strength steel slab 1 requirement of strength in the step 1 of present embodiment is that 5min, requirement of strength low regional heat time heating time is 2min high regional heat time heating time, and the regional heating-up temperature that the zone that requirement of strength is high and requirement of strength are low is 900 ℃.In the present embodiment, the heating-up temperature by zones of different on the control high-strength steel slab 1 is to obtain different austenitizing degree.Only needing during enforcement that heater 2 is carried out the subregion temperature control can achieve the above object, and method is simple.Other step is identical with the specific embodiment five.
The specific embodiment seven: in conjunction with Fig. 3 present embodiment is described, in whole forming process, passes into the temperature that cooling water makes shaping dies 3 always in the shaping dies 3 and remain on 20 ℃～50 ℃ in the step 3 of present embodiment.Shaping dies 3 is in lower and basicly stable temperature all the time, in forming process each time, after high-strength steel slab 1 is put in the shaping dies 3, in the process that matched moulds is shaped and quenches fast, therefore the forming temperature of high-strength steel slab 1 and Cooling Quenching speed are substantially constant, can guarantee the uniformity of the geomery of final formation of parts and mechanical property etc.Other step is identical with the specific embodiment one.
The specific embodiment eight: present embodiment is described in conjunction with Fig. 2 and Fig. 3, present embodiment is in step 2, the initial temperature of shaping dies 3 is 100 ℃～250 ℃, in step 3, pass into cooling water in the Cooling Holes 4 on the shaping dies 3, the temperature that makes shaping dies 3 is with the Speed Reduction of 30 ℃/s～100 ℃/s, in step 4, when the temperature of mould 3 to be formed is down to 250 ℃, stop to pass into cooling water.In step 2 in the forming process of high-strength steel slab 1, shaping dies 3 is in tepid state and its temperature along with the carrying out that is shaped slightly rises.High-strength steel slab 1 forming property under tepid state is better, can realize the shaping of complicated shape part, and resilience is little after being shaped.The temperature that it may be noted that high-strength steel slab 1 when step 2 finishes need to be higher than the critical hardening temperature, otherwise can affect the quenching strengthening effect of high-strength steel slab 1 in the step 3.In step 4, the temperature of shaping dies 3 stops to pass into cooling water when being down to 250 ℃, and shaping dies 3 was in thermal condition when this can guarantee to be shaped on the one hand next time, had also shortened in addition whole curring time.Other step is identical with the specific embodiment one.
The specific embodiment nine: present embodiment is described in conjunction with Fig. 4, present embodiment is after step 1 is finished, before step 2, increase step 1 a, the region division local cooling device 5 that requirement of strength is low on high-strength steel slab 1, to this area spray water smoke or liquid nitrogen, make this regional temperature remain on 700 ℃～850 ℃ by local cooling device 5.In the present embodiment, adopt water smoke as cooling medium, can make the local temperature fast-descending on the high strength steel plate base 1, realize larger thermograde; Adopt liquid nitrogen as cooling medium, in effective cooling, nitrogen also can play the effect of protective atmosphere, prevents the panel surface oxidation.Other step is identical with the specific embodiment one.
The specific embodiment ten: present embodiment is described in conjunction with Fig. 5, present embodiment is after step 1 is finished, before step 2, increase step 1 b, the region division low temperature contact block 6 that requirement of strength is low on high-strength steel slab 1, low temperature contact block 6 is that temperature is 400 ℃～850 ℃ object, and low temperature contact block 6 contacts with high-strength steel slab 1.In the present embodiment, adopt the lower low temperature contact block 6 of temperature and the high-strength steel slab 1 local mode that contacts, can make the temperature of regional area on the high-strength steel slab 1 be lower than other positions.The method is simple, can realize the accurate control of different parts temperature on the high-strength steel slab 1.Other step is identical with the specific embodiment one.
Claims (10)
1. the hot press-formed method of an intensity adjustable distribution high-strength steel sheet material part, it is characterized in that: described method realizes by following steps:
Step 1, high-strength steel slab to be formed (1) is put into heater (2), high-strength steel slab (1) is divided into several zones along its length, several zones are respectively a district (A), He San districts, two districts (B) (C), the district (A) that heater (2) is corresponding, He San districts, two districts (B) (C) adopt similar and different heating-up temperature to carry out subregion control, the district (A) that heater (2) is corresponding, He San districts, two districts (B) (C) adopt and carry out subregion control similar and different heat time heating time;
Step 2, the high-strength steel slab (1) after will heating were transferred to rapidly in 3～5 seconds in the shaping dies (3), and quick-make shaping dies (3) was also finished high-strength steel slab (1) and is shaped in 1～3 second;
Step 3, keep shaping dies (3) closure, pass into cooling water in the Cooling Holes (4) on the shaping dies (3) and reduce its temperature, make high-strength steel sheet material part (7) fast cooling realize quenching;
Step 4, after quench finishing, open shaping dies (3), take out gained high-strength steel sheet material part (7).
2. the hot press-formed method of described a kind of intensity adjustable distribution high-strength steel sheet material part according to claim 1, it is characterized in that: the district (A) that the heater in the described step 1 (2) is corresponding, He San districts, two districts (B) (C) adopt different heating-up temperatures, carry out subregion control identical heat time heating time, the high regional heating-up temperature of high-strength steel slab (1) requirement of strength in the step 1 is 850 ℃～1000 ℃, the regional heating-up temperature that requirement of strength is low is 700 ℃～850 ℃, is 3min～6min the regional heat time heating time that the zone that requirement of strength is high and requirement of strength are low.
3. the hot press-formed method of described a kind of intensity adjustable distribution high-strength steel sheet material part according to claim 2, it is characterized in that: the regional heating-up temperature that the high regional heating-up temperature of high-strength steel slab (1) requirement of strength is 900 ℃, requirement of strength is low in the described step 1 is 750 ℃, is 5min the regional heat time heating time that the zone that requirement of strength is high and requirement of strength are low.
4. the hot press-formed method of described a kind of intensity adjustable distribution high-strength steel sheet material part according to claim 2, it is characterized in that: the regional heating-up temperature that the high regional heating-up temperature of high-strength steel slab (1) requirement of strength is 950 ℃, requirement of strength is low in the described step 1 is 800 ℃, is 4min the regional heat time heating time that the zone that requirement of strength is high and requirement of strength are low.
5. the hot press-formed method of described a kind of intensity adjustable distribution high-strength steel sheet material part according to claim 1, it is characterized in that: the district (A) that the heater in the described step 1 (2) is corresponding, He San districts, two districts (B) (C) adopt identical heating-up temperature, carry out subregion control different heat time heating times, be 3min～6min high-strength steel slab (1) the requirement of strength high regional heat time heating time in the step 1, be 1min～3min the regional heat time heating time that requirement of strength is low, and the regional heating-up temperature that the zone that requirement of strength is high and requirement of strength are low is 850 ℃～1000 ℃.
6. the hot press-formed method of described a kind of intensity adjustable distribution high-strength steel sheet material part according to claim 5, it is characterized in that: high-strength steel slab (1) requirement of strength in the described step 1 is that 5min, requirement of strength low regional heat time heating time is 2min high regional heat time heating time, and the regional heating-up temperature that the zone that requirement of strength is high and requirement of strength are low is 900 ℃.
7. the hot press-formed method of described a kind of intensity adjustable distribution high-strength steel sheet material part according to claim 1, it is characterized in that: in whole forming process, pass into the temperature that cooling water makes shaping dies (3) always in the shaping dies (3) and remain on 20 ℃～50 ℃ in the described step 3.
8. the hot press-formed method of described a kind of intensity adjustable distribution high-strength steel sheet material part according to claim 1, it is characterized in that: in step 2, the initial temperature of shaping dies (3) is 100 ℃～250 ℃, in step 3, pass into cooling water in the Cooling Holes (4) on the shaping dies (3), the temperature that makes shaping dies (3) is with the Speed Reduction of 30 ℃/s～100 ℃/s, in step 4, when the temperature of mould to be formed (3) is down to 250 ℃, stop to pass into cooling water.
9. the hot press-formed method of described a kind of intensity adjustable distribution high-strength steel sheet material part according to claim 1, it is characterized in that: after step 1 is finished, before step 2, increase step 1 a, at the upper low region division local cooling device (5) of requirement of strength of high-strength steel slab (1), to this area spray water smoke or liquid nitrogen, make this regional temperature remain on 700 ℃～850 ℃ by local cooling device (5).
10. the hot press-formed method of described a kind of intensity adjustable distribution high-strength steel sheet material part according to claim 1, it is characterized in that: after step 1 is finished, before step 2, increase step 1 b, at the upper low region division low temperature contact block (6) of requirement of strength of high-strength steel slab (1), low temperature contact block (6) is that temperature is 400 ℃～850 ℃ object, and low temperature contact block (6) contacts with high-strength steel slab (1).
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