CN116902079A - Thermoforming door ring, thermoforming door ring processing method and vehicle - Google Patents
Thermoforming door ring, thermoforming door ring processing method and vehicle Download PDFInfo
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- CN116902079A CN116902079A CN202211449728.3A CN202211449728A CN116902079A CN 116902079 A CN116902079 A CN 116902079A CN 202211449728 A CN202211449728 A CN 202211449728A CN 116902079 A CN116902079 A CN 116902079A
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- 238000003672 processing method Methods 0.000 title abstract description 7
- 238000003856 thermoforming Methods 0.000 title abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 99
- 238000003466 welding Methods 0.000 claims abstract description 74
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 11
- 239000012535 impurity Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 13
- 238000001816 cooling Methods 0.000 claims description 7
- 238000012546 transfer Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 3
- 238000005452 bending Methods 0.000 abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 238000010587 phase diagram Methods 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- CYUOWZRAOZFACA-UHFFFAOYSA-N aluminum iron Chemical compound [Al].[Fe] CYUOWZRAOZFACA-UHFFFAOYSA-N 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D25/00—Superstructure or monocoque structure sub-units; Parts or details thereof not otherwise provided for
- B62D25/04—Door pillars ; windshield pillars
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
- B23K33/008—Filling of continuous seams for automotive applications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/28—Beams
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Body Structure For Vehicles (AREA)
Abstract
The disclosure relates to the technical field of vehicles, in particular to a thermal forming door ring, a thermal forming door ring processing method and a vehicle. The thermoforming door ring provided by the disclosure comprises an A column lower edge beam, an A column upper edge beam, a B column upper edge beam and a B column lower edge beam; the A column upper edge beam and the A column lower edge beam are subjected to laser splice welding to form a first welding seam, and the A column upper edge beam and the B column upper edge beam are subjected to laser splice welding to form a second welding seam; forming a third welding seam after the B column upper side beam and the B column lower side beam are subjected to laser splice welding; forming a fourth welding seam after the lower side beam of the B column and the lower side beam of the A column are subjected to laser splice welding; wherein, the A column upper boundary beam is made of a material with tensile strength reaching 2000 Mpa. According to the embodiment of the disclosure, the material with the tensile strength reaching 2000Mpa is applied to the A-pillar upper edge beam, so that the A-pillar upper edge beam is prevented from bending in the 25% small-offset collision process.
Description
Technical Field
The disclosure relates to the technical field of vehicles, in particular to a thermal forming door ring, a thermal forming door ring processing method and a vehicle.
Background
The automobile door ring is an important structural member for forming an automobile body framework and is formed by sequentially connecting an automobile A column lower edge beam, an automobile A column upper edge beam, an automobile B column upper edge beam and an automobile B column lower edge beam in an end-to-end mode.
After the automobile is manufactured, a 25% small offset collision test is required to be carried out on the automobile to evaluate the anti-collision capability of the automobile door ring, and in the related art, the thickness of the whole automobile door ring is generally increased, so that the whole thickness is the same to improve the anti-collision capability of the automobile door ring, but the anti-collision capability is limited.
Therefore, how to improve the anti-collision capability of the automobile door ring is a technical problem to be solved.
Disclosure of Invention
In order to solve the technical problems, the disclosure provides a thermal forming door ring, a thermal forming door ring processing method and a vehicle.
A first aspect of the present disclosure provides a thermoformed door ring comprising: the lower side beam of the A column, the upper side beam of the B column and the lower side beam of the B column are sequentially connected end to end;
the A column upper edge beam is made of a material with tensile strength not less than 2000 Mpa.
Further, the tensile strength of the material adopted by the A column upper edge beam is not less than 2000Mpa, and the material comprises the following components in percentage by mass:
c0.3-0.37%, mn:0.3 to 1.1 percent, si:0.1 to 0.8 percent, cr:0.1 to 0.5 percent, B:0.001 to 0.005 percent of Ti:0.01 to 0.06 percent, mo:0.1 to 0.5 percent, and the balance of Fe and other unavoidable impurities.
Further, the B column lower edge beam is made of the following materials in parts by weight: c0.05-0.1%, mn:1.2 to 1.8 percent, si:0.1 to 0.6 percent, cr: < 0.2%, B:0.001 to 0.005 percent of Ti:0.01 to 0.05 percent, and the balance of Fe and unavoidable other impurities; and/or the number of the groups of groups,
the materials adopted by the lower side beam of the column A and the upper side beam of the column B comprise the following components in percentage by mass: 0.2 to 0.25 percent, mn:1.1 to 1.4 percent, si:0.1 to 0.35 percent, cr:0.15 to 0.3 percent, B:0.001 to 0.005 percent of Ti:0.01 to 0.06 percent, mo: less than 0.035%, and the balance of Fe and unavoidable other impurities.
Further, the thickness of the upper edge beam of the A column is 1.2-2.4 mm;
the thickness of the lower edge beam of the B column is 1.2-1.6 mm;
the thickness of the lower edge beam of the column A is 1.2-1.6 mm;
the thickness of the upper boundary beam of the B column is 1.4-2.4 mm.
Further, the lower side beam of the B column is made of a material with tensile strength not less than 1000 Mpa;
the lower side beam of the A column is made of a material with tensile strength not less than 1500 Mpa;
the B column upper side beam is made of a material with tensile strength not less than 1500 Mpa.
A second aspect of the present disclosure provides a method for processing a thermoformed door ring according to the first aspect, comprising the steps of:
obtaining the material sheets required by the upper side beam of the A column, the lower side beam of the A column, the upper side beam of the B column and the lower side beam of the B column, and then stripping the material sheets;
positioning each material sheet through a splice welding fixture, and fixing each material sheet on the splice welding fixture;
sequentially welding the lower side beam of the A column, the upper side beam of the B column, the lower side beam of the B column and the lower side beam of the A column;
and after the splice welding is completed, forming the hot forming door ring.
Further, the material sheet is put into a heating furnace for heating treatment, the heating temperature is 900-930 ℃, and the heat preservation time is 6-10 min;
the heated door ring material sheet is sent into a press for press forming.
Further, the transfer time from the heating furnace to the press is controlled within 10 seconds.
Further, the cooling speed in the stamping process is more than 50 ℃/s, and the cooling end temperature is controlled to be 100-200 ℃.
Further, the pressure is kept for 6 to 10 seconds after the molding.
Further, the method comprises the steps of,
the yield strength range after the hot stamping after the laser splice welding of the upper side beam of the A column and the lower side beam of the A column is 950-1250 MPa, the tensile strength range is 1300-1650 MPa, the elongation is 5-7%, and the A column is broken at the lower side beam of the A column;
the yield strength range of the A column upper edge beam and the B column upper edge beam after hot stamping after laser splice welding is 950-1250 MPa, the tensile strength range is 1300-1650 MPa, the elongation is 5-7%, and the B column upper edge beam is broken;
the yield strength range of the B column lower edge beam and the A column lower edge beam after hot stamping after laser splice welding is 800-1000 MPa, the tensile strength range is 1000-1250 MPa, the elongation is 5-7%, and the B column lower edge beam is broken;
the yield strength range of the B column lower side beam and the B column upper side beam after hot stamping after laser splice welding is 800-1000 MPa, the tensile strength range is 1000-1250 MPa, the elongation is 5-7%, and the B column lower side beam is broken.
A third aspect of the present disclosure provides a vehicle comprising the thermoformed door ring of the first aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
according to the embodiment of the disclosure, the specific position of the A column upper side beam is selected from the A column lower side beam, the A column upper side beam, the B column upper side beam and the B column lower side beam, the material of the A column upper side beam is selected to be a material with tensile strength not less than 2000Mpa, and through experimental verification, the specific position is selected to be a material with tensile strength not less than 2000Mpa, and the anti-collision capability of an automobile door ring can be improved in a 25% small offset collision test.
Drawings
FIG. 1 is a schematic view of a thermoformed door ring according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of another configuration of a thermoformed door ring according to an embodiment of the present disclosure;
FIG. 3 is a plot of web thickness versus heating time and heating temperature;
FIG. 4 is a golden phase diagram of a Ussibor 2000MPa material;
FIG. 5 is a gold phase diagram of a Ussibor 1500MPa material;
FIG. 6 is a golden phase diagram of Ductibor1000MPaPa material.
Reference numeral 1, a pillar lower side beam; 2. a column A upper side beam; 3. b column upper side beam; 4. b column lower side beam; 5. a first weld; 6. a second weld; 7. a third weld; 8. and a fourth weld.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, a further description of aspects of the present disclosure will be provided below. It should be noted that, without conflict, the embodiments of the present disclosure and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the disclosure.
As shown in conjunction with fig. 1, 2, 3, 4, 5, and 6, a thermoformed door ring provided by an embodiment of the present disclosure includes: the lower side beam 1 of the A column, the upper side beam 2 of the A column, the upper side beam 3 of the B column and the lower side beam 4 of the B column; the lower side beam 1 of the A column, the upper side beam 2 of the A column, the upper side beam 3 of the B column and the lower side beam 4 of the B column are connected end to end in sequence; the A-pillar upper edge beam 2 is made of a material with tensile strength not less than 2000 Mpa. According to the embodiment of the disclosure, the material with the tensile strength reaching 2000Mpa is applied to the A-pillar upper edge beam 2, so that the A-pillar upper edge beam 2 is prevented from bending in the 25% small-offset collision process. The whole car safety and the light weight can be realized under the condition of meeting the safety 25% small bias by adopting the material with the tensile strength reaching 2000 Mpa.
Specifically, a first welding seam 5 is formed after the A-column upper edge beam 2 and the A-column lower edge beam 1 are subjected to laser splice welding, and a second welding seam 6 is formed after the A-column upper edge beam 2 and the B-column upper edge beam 3 are subjected to laser splice welding; the upper boundary beam 3 of the B column and the lower boundary beam 4 of the B column are subjected to laser splice welding to form a third welding line 7; the lower boundary beam 4 of the B column and the lower boundary beam 1 of the A column are subjected to laser splice welding to form a fourth welding line 8; wherein, the A-pillar upper boundary beam 2 is made of a material with tensile strength reaching 2000 Mpa. According to the embodiment of the disclosure, the material with the tensile strength reaching 2000Mpa is applied to the A-pillar upper edge beam 2, so that the A-pillar upper edge beam 2 is prevented from bending in the 25% small-offset collision process. The whole car safety and the light weight can be realized under the condition of meeting the safety 25% small bias by adopting the material with the tensile strength reaching 2000 Mpa. The A column lower boundary beam 1, the A column upper boundary beam 2, the B column upper boundary beam 3 and the B column lower boundary beam 4 are sequentially connected in a head-to-tail mode through splice welding, the lap joint edge is omitted, the weight of a door ring can be reduced, raw materials are saved, meanwhile, the thickness of each part is realized, the safety strength requirements of different positions of the door ring are met, the safety of an automobile is guaranteed, and the weight of the automobile is reduced.
Experiments prove that the specific position (the upper side beam of the A column) is selected to be a material with the tensile strength not less than 2000Mpa, and the anti-collision capability of the automobile door ring is better when the material is subjected to a 25% small-offset collision test than when the material with the tensile strength not less than 2000Mpa is selected at other positions (such as the lower side beam of the A column, the upper side beam of the B column or the lower side beam of the B column).
The thermal forming door ring of the embodiment of the disclosure adopts thermal forming materials with aluminum-silicon coating, and comprises three thermal forming materials of Ussibor 2000MPa, ussibor 1500MPa and Ductibr1000 MPa.
In some specific embodiments, the material with tensile strength not less than 2000Mpa used for the a-pillar roof side rail 2 comprises the following components in mass fraction: c0.3-0.37%, mn:0.3 to 1.1 percent, si:0.1 to 0.8 percent, cr:0.1 to 0.5 percent, B:0.001 to 0.005 percent of Ti:0.01 to 0.06 percent, mo:0.1 to 0.5 percent, and the balance of Fe and other unavoidable impurities.
In this preferred embodiment, the content of C is 0.3 to 0.37%, for example: 0.3%, 0.31%, 0.32%, 0.33%, 0.34%, 0.35%, 0.36% or 0.37%, etc.
In this preferred embodiment, the Mn content is 0.3 to 1.1%, for example: 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1% or 1.1%, etc.
In this preferred embodiment, the Si content is 0.1 to 0.8%, for example: 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7% or 0.8%, etc.
In this preferred embodiment, the Cr content is 0.1 to 0.5%, for example: 0.1%, 0.2%, 0.3%, 0.4% or 0.5%, etc.
In this preferred embodiment, the content of B is 0.001 to 0.005%, for example: 0.001%, 0.002%, 0.003%, 0.004% or 0.005% etc.
In this preferred embodiment, the Ti content is 0.01 to 0.06%, for example: 0.01%, 0.02%, 0.03%, 0.04%, 0.05% or 0.06%, etc.
In this preferred embodiment, the Mo content is 0.1 to 0.5%, for example: 0.1%, 0.2%, 0.3%, 0.4% or 0.5%, etc.
According to the embodiment, the A column upper side beam 2 made of the material with the tensile strength not smaller than 2000Mpa can be relatively thin, namely, the A column upper side beam can be thinned under the condition of meeting the performance requirement, so that the anti-collision capability of an automobile door ring can be improved while the light weight requirement is met.
In some specific embodiments, the B-pillar rocker 4 is made of a material comprising the following components in mass fraction: c0.05-0.1%, mn:1.2 to 1.8 percent, si:0.1 to 0.6 percent, cr: < 0.2%, B:0.001 to 0.005 percent of Ti:0.01 to 0.05 percent, and the balance of Fe and unavoidable other impurities.
In this preferred embodiment, the content of C is 0.05 to 0.1%, for example: 0.05%, 0.06%, 0.07%, 0.08%, 0.09%, or 0.1%, etc.
In this preferred embodiment, the Mn content is 1.2 to 1.8%, for example: 1.2%, 1.3%, 1.4%, 1.5%, 1.6%,.7% or 1.8%, etc.
In this preferred embodiment, the Si content is 0.1 to 0.6%, for example: 0.1%, 0.2%, 0.3%, 0.4%, 0.5% or 0.6%, etc.
In this preferred embodiment, the Cr content is 0.2%, for example: 0.19%, 0.18%, 0.15%, 0.1%, 0.05% or 0.01%, etc.
In this preferred embodiment, the content of B is 0.001 to 0.005%, for example: 0.001%, 0.002%, 0.003%, 0.004% or 0.005% etc.
In this preferred embodiment, the Ti content is 0.01 to 0.05%, for example: 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, etc.
In some specific embodiments, the materials used for the lower side beam 1 of the column a and the upper side beam 3 of the column B comprise the following components in percentage by mass: c:0.2 to 0.25 percent, mn:1.1 to 1.4 percent, si:0.1 to 0.35 percent, cr:0.15 to 0.3 percent, B:0.001 to 0.005 percent of Ti:0.01 to 0.06 percent, mo: less than 0.035%, and the balance of Fe and unavoidable other impurities.
In this preferred embodiment, the content of C is 0.2 to 0.25%, for example: 0.2%, 0.21%, 0.22%, 0.23%, 0.24%, or 0.25%, etc.
In this preferred embodiment, the Mn content is 1.1 to 1.4%, for example: 1.1%, 1.2%, 1.3% or 1.4%, etc.
In this preferred embodiment, the Si content is 0.1 to 0.35%, for example: 0.1%, 0.15%, 0.2%, 0.25%, 0.3%, or 0.35%, etc.
In this preferred embodiment, the Cr content is 0.15 to 0.3%, for example: 0.1%, 0.2%, 0.15% or 0.3%, etc.
In this preferred embodiment, the content of B is 0.001 to 0.005%, for example: 0.001%, 0.002%, 0.003%, 0.004% or 0.005% etc.
In this preferred embodiment, the Ti content is 0.01 to 0.06%, for example: 0.01%, 0.02%, 0.03%, 0.04%, 0.05% or 0.06%, etc.
In this preferred embodiment, the Mo content is < 0.035%, for example: 0.01%, 0.02%, 0.03% or 0.034%, etc.
In some specific embodiments, the upper side beam 2 of the column a is made of a material of Usibor2000MPa, and the material of Usibor2000MPa comprises the following components in percentage by mass: c0.3-0.37%, mn:0.3 to 1.1 percent, si:0.1 to 0.8 percent, cr:0.1 to 0.5 percent, B:0.001 to 0.005 percent of Ti:0.01 to 0.06 percent, mo:0.1 to 0.5 percent, and the balance of Fe and other unavoidable impurities. The A column upper edge beam 2 made of Ussibor 2000MPa material can be relatively thin, namely can be thinned under the condition of meeting the performance requirement, so that the anti-collision capability of the automobile door ring can be improved while the light weight requirement is met.
Example 1) Ussibor 2000MPa material components and mass percentages thereof are: c0.3%, mn:0.3%, si:0.1%, cr:0.1%, B:0.001%, ti:0.01%, mo:0.1% of Fe and the balance of unavoidable impurities.
Example 2) Ussibor 2000MPa material components and mass percentages thereof are: c0.37%, mn:1.1%, si:0.8%, cr:0.5%, B:0.005%, ti:0.06%, mo:0.5% of Fe and the balance of unavoidable impurities.
Example 3) Ussibor 2000MPa material components and mass percentages thereof are: c0.34%, mn:0.8%, si:0.5%, cr:0.3%, B:0.003%, ti:0.03%, mo:0.3% of Fe and the balance of unavoidable other impurities.
The B column lower edge beam 4 is made of Ductibor1000MPa material, and the Ductibor1000MPa material comprises the following components in percentage by mass: c0.05-0.1%, mn:1.2 to 1.8 percent, si:0.1 to 0.6 percent, cr: < 0.2%, B:0.001 to 0.005 percent of Ti:0.01 to 0.05 percent, and the balance of Fe and unavoidable other impurities.
Example 1) Ussibor 1500MPa material components and mass percentages thereof are: c0.05%, mn:1.2%, si:0.1%, cr:0.18%, B:0.001%, ti:0.01% of Fe and the balance of unavoidable impurities.
Example 2) Usbor 1500MPa material composition and mass percentage are: c0.1%, mn:1.8%, si:0.6%, cr:0.19%, B:0.005%, ti:0.05 percent of Fe and the balance of unavoidable other impurities.
Example 3) Usbor 1500MPa material composition and mass percentage are: c0.08%, mn:1.5%, si:0.4%, cr:0.15%, B:0.002%, ti:0.02% of Fe and the balance of unavoidable impurities.
The lower side beam 1 of the column A and the upper side beam 3 of the column B are both made of Ubeor 1500MPa materials, and the Ubeor 1500MPa materials comprise the following components in percentage by mass: 0.2 to 0.25 percent, mn:1.1 to 1.4 percent, si:0.1 to 0.35 percent, cr:0.15 to 0.3 percent, B:0.001 to 0.005 percent of Ti:0.01 to 0.06 percent, mo: less than 0.035%, and the balance of Fe and unavoidable other impurities.
Example 1) Ductibor1000MPa material composition and mass percentages are: c0.2%, mn:1.1%, si:0.1%, cr:0.15%, B:0.001%, ti:0.01%, mo:0.034% and the balance of Fe and unavoidable other impurities.
Example 2) Ductibor1000MPa material composition and mass percentages are: c0.25%, mn:1.4%, si:0.35%, cr:0.3%, B:0.005%, ti:0.06%, mo:0.03 percent of Fe and the balance of unavoidable other impurities.
Example 3) Ductibor1000MPa material composition and mass percentages are: c0.22%, mn:1.2%, si:0.2%, cr:0.2%, B:0.003%, ti:0.03%, mo:0.02% of Fe and the balance of unavoidable impurities.
Because the strength of the hot forming steel mainly depends on the carbon content and the structure thereof, the carbon content of the Ussibor 2000MPa steel is relatively highest, the carbon content of the Ussibor 1500MPa steel is controlled to be between 0.3 and 0.37 percent, the carbon content of the Ussibor 1500MPa steel is controlled to be between 0.2 and 0.25 percent, the carbon content of the Ductibor1000MPa is controlled to be minimum, and the carbon content of the Ductibor is controlled to be between 0.05 and 0.1 percent.
Mn: the Mn element has the functions of solid solution strengthening and improving hardenability in steel, but the segregation tendency of Mn is higher, so that the content of Mn in Ussibor 2000MPa steel is relatively low, namely 0.3-1.1%, so that the performance is not affected by the segregation.
Si: the role of Si in steel is mainly solid solution strengthening. Higher Si content can improve the hardenability of steel, and Si is added into the steel to improve the strength and toughness of the steel, and the Si can increase the austenite amount for reducing the hydrogen diffusion speed. Therefore, the Ussibor 2000MPa steel is relatively higher by 0.1-0.8% to improve the brittleness and hydrogen embrittlement problems caused by higher carbon equivalent.
Cr: cr acts as fine grain strengthening in steel, and Cr with higher content can refine grains and improve strength. Therefore, the content of Cr in the Ussibor 2000MPa steel is higher and controlled to be 0.1-0.5%.
Mo: mo can effectively prevent coarse austenitized grains and improve the hardenability of steel, so that the content of the Mo in the Ussibor 2000MPa steel is higher and controlled to be 0.1-0.5%.
As shown in fig. 4, 5 and 6, the above material compositions were as follows in terms of microstructure and properties after thermal forming of Usibor2000MPa, usibor1500MPa and ducibr 1000 MPa:
the microstructure after being thermoformed by Ussibor 2000MPa is fine-chip martensite, the yield strength after being hot stamped is 1400-1700 MPa, the tensile strength is 1800-2050 MPa, the elongation is 5-7%, and the bending angle is 40-60 degrees.
The microstructure of the Ussibor 1500MPa after hot forming is flaky martensite, the grain size is slightly larger than 2000MPa, the yield strength range after hot stamping is 950-1250 MPa, the tensile strength range is 1300-1650 MPa, the elongation is 5-7%, and the bending angle range is 45-65 degrees.
After being thermoformed, ductibr1000MPa has flaky martensite and bainite with good toughness. The yield strength after hot stamping is 800-1000 MPa, the tensile strength is 1000-1250 MPa, the elongation is 6-8%, and the bending angle is 75-95 degrees.
In some specific embodiments, the thickness of the a-pillar roof rail 2 is 1.2 to 2.4mm, for example: 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or the like; the thickness of the B pillar rocker 4 is 1.2 to 1.6mm, for example: 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, etc.; the thickness of the A column lower side beam 1 is 1.2-1.6 mm, for example: 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, etc.; the thickness of the B-pillar roof side rail 3 is 1.4-2.4 mm, for example: 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or the like. The thickness of each part can meet the safety strength requirements of different positions of the door ring, the safety of the automobile is ensured, and the weight of the automobile is reduced.
Specifically, the material and the material thickness of the laser tailor-welded door ring are selected based on the factors such as the material, the laser tailor-welded performance, the material thickness and the like. In order to ensure the strength and avoid bending caused by small offset, the upper side beam 2 of the A column adopts Ussibor 2000MPa material with the highest strength grade, and the thickness of the material is 1.2-2.4 mm.
The lower part of the column B adopts Ductibor1000MPa material with better toughness due to the energy absorption in the side collision process, and the material thickness is 1.2-1.6 mm. In order to avoid the failure and the safety performance of the Uibor 2000 MPa+Uibor 2000MPa laser tailor-welding, the lower part of the A column and the upper part of the B column adopt Uibor 1500MPa materials, wherein the blanking thickness of the A column is 1.2-1.6 mm, and the feeding thickness of the B column is 1.4-2.4 mm.
In some specific embodiments, the B-pillar rocker 4 is made of a material with a tensile strength of not less than 1000 Mpa; the A column lower side beam 1 is made of a material with tensile strength not less than 1500 Mpa; the B column upper side beam 3 is made of a material with tensile strength not less than 1500Mpa, so that raw materials are saved, the thickness of each part is realized, the safety strength requirements of different positions of the door ring are met, the safety of an automobile is ensured, the weight of the automobile is reduced, and the anti-collision capability of the automobile door ring can be improved. According to the embodiment of the disclosure, the material with the tensile strength reaching 2000Mpa is applied to the A-pillar upper edge beam 2, so that the A-pillar upper edge beam 2 is prevented from bending in the 25% small-offset collision process. The whole car safety and the light weight can be realized under the condition of meeting the safety 25% small bias by adopting the material with the tensile strength reaching 2000 Mpa.
The processing method of the thermoforming door ring provided by the embodiment of the disclosure comprises the following steps:
obtaining the material sheets required by the upper side beam 2 of the A column, the lower side beam 1 of the A column, the upper side beam 3 of the B column and the lower side beam 4 of the B column, and then carrying out stripping treatment on the material sheets, wherein the stripping treatment can be specifically laser plate stripping treatment; positioning each material sheet through a splice welding fixture, and fixing each material sheet on the splice welding fixture, specifically, fixing each material sheet on a laser splice welding fixture through an electromagnet; sequentially welding an A-column lower side beam 1, an A-column upper side beam 2, a B-column upper side beam 3, a B-column lower side beam 4 and an A-column lower side beam 1; and after the splice welding is finished, forming the door ring by heat.
Specifically, laser tailor welding may be employed.
Preferably, the welding sequence of the laser splice welding is that a first welding line 5-Weld1, a third welding line 7-Weld3, a second welding line 6-Weld2 and a fourth welding line 8-Weld4 are formed in sequence; and after the laser welding is completed, forming the laser welding door ring plate.
Specifically, according to the door ring composition, the materials of each component are subjected to pattern arrangement and blanking to obtain the required material sheets of the upper side beam 2 of the A column, the lower side beam of the A column, the upper side beam of the B column and the lower side beam of the B column, and then the material sheets are subjected to laser half-stripping treatment. And then positioning each material sheet through a welding fixture, fixing each material sheet on the laser welding fixture through an electromagnet, and carrying out laser welding on the door ring according to a preset sequence. In order to improve the laser welding efficiency and reduce the welding deformation, the welding sequence of the laser welding is from Weld1 welding point to Weld3 to Weld2 to Weld4. After the laser welding is completed, forming the laser welding door ring plate,
in some specific embodiments, the material sheet is put into a heating furnace for heating treatment, the heating temperature is 900-930 ℃, and the heat preservation time is 6-10 min; the heated door ring material sheet is sent into a press for press forming.
Referring to fig. 3, since the thickness of the door ring material sheet is between 1.2 and 2.4mm, in order to ensure that all positions of the door ring meet the mechanical requirement, according to the thickness of the thermal forming material, the heating time and the temperature relationship, the heating temperature is 900-930 ℃, and the heat preservation time is 6-10 min, so that the door ring plate is completely austenitized.
In some embodiments, the transfer time from the furnace to the press is controlled to be within 10 seconds.
In some embodiments, the cooling rate of the stamping process is greater than 50 ℃/s and the cooling end temperature is controlled between 100 ℃ and 200 ℃.
In some embodiments, the pressure is maintained for 6-10 s after molding.
The heated door ring material sheet is sent into a press for stamping forming through a transmission mechanism, the transfer time is controlled within 10 seconds to ensure the mold entering temperature, the cooling speed is more than 50 ℃/s, and the pressure is kept for 6-10 seconds after forming, so as to form the door ring part meeting the performance requirement
In some embodiments of the present invention, in some embodiments,
the yield strength range after the hot stamping after the laser splice welding of the A column upper boundary beam 2 and the A column lower boundary beam 1 is 950-1250 MPa, the tensile strength range is 1300-1650 MPa, the elongation is 5-7%, and the A column lower boundary beam 1 is broken;
the yield strength range of the A column upper edge beam 2 and the B column upper edge beam 3 after laser splice welding and after hot stamping is 950-1250 MPa, the tensile strength range is 1300-1650 MPa, the elongation is 5-7%, and the B column upper edge beam 3 is broken;
the yield strength range of the B column lower boundary beam 4 and the A column lower boundary beam 1 after laser splice welding and after hot stamping is 800-1000 MPa, the tensile strength range is 1000-1250 MPa, the elongation is 5-7%, and the B column lower boundary beam 4 is broken; the method comprises the steps of carrying out a first treatment on the surface of the
The yield strength range after the hot stamping after the laser splice welding of the B column lower boundary beam 4 and the B column upper boundary beam 3 is 800-1000 MPa, the tensile strength range is 1000-1250 MPa, the elongation is 5-7%, and the B column lower boundary beam 4 is broken.
Specifically, the door ring material sheets are formed by welding steel plates with different materials and different thicknesses by laser splice welding. In the embodiment of the disclosure, the thermal forming material is an aluminum-silicon coating thermal forming plate, and the aluminum-silicon coating is subjected to half-stripping treatment by adopting laser before laser splice welding so as to avoid the brittle phase of aluminum-iron intermetallic compounds in the welding seam and influence the performance of the welding seam. The performance of the laser splice welded plate which is formed by the laser splice welding and is made of different materials is as follows:
the yield strength range after the Ussibor 2000MPa and the Ussibor 2000MPa are subjected to laser tailor-welding is 1400-1700 MPa, the tensile strength range is 1800-2050 MPa, the elongation is less than 5%, and the breaking position of the tensile test is on the laser tailor-welded seam, so that the performance requirement cannot be met.
The yield strength range after hot stamping after laser splice welding of Ussibor 2000 and Ussibor 1500MPa is 950-1250 MPa, the tensile strength range is 1300-1650 MPa, the elongation is 5-7%, and the fracture is at the low-strength parent metal of Ussibor 1500MPa, so that the mechanical property requirement is met.
The yield strength range after the laser splice welding and hot stamping of Ussibor 2000MPa and Ductibor1000MPa is 800-1000 MPa, the tensile strength range is 1000-1250 MPa, the elongation is 5-7%, and the fracture is at the low-strength parent metal of Ductibor1000MPa, so that the requirement of mechanical property is met.
The yield strength range after the USIBOR1500MPa and the USIBOR1500MPa are subjected to laser splice welding and hot stamping is 950-1250 MPa, the tensile strength range is 1300-1650 MPa, the elongation is 5-7%, the fracture position is positioned in a non-welding area, and the mechanical property requirement is met.
The yield strength range of the Ussibor 1500MPa and the Ductibor1000MPa after laser splice welding and hot stamping is 800-1000 MPa, the tensile strength range is 1000-1250 MPa, the elongation is 5-7%, and the fracture is at the low-strength parent metal of the Ductibor1000MPa, so that the requirement of mechanical property is met.
The vehicle provided by the embodiment of the disclosure comprises the thermal forming door ring provided by the embodiment of the disclosure or the processing method of the thermal forming door ring provided by the embodiment of the disclosure. Because the vehicle provided by the embodiments of the present disclosure has the same advantages as the thermoformed door ring provided by the embodiments of the present disclosure or the method for processing the thermoformed door ring provided by the embodiments of the present disclosure, the description thereof will not be repeated here.
It should be noted that in this document, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.
Claims (10)
1. A thermoformed door ring comprising: the lower side beam of the A column, the upper side beam of the B column and the lower side beam of the B column are sequentially connected end to end; it is characterized in that the method comprises the steps of,
the A column upper edge beam is made of a material with tensile strength not less than 2000 Mpa.
2. The thermoformed door ring according to claim 1, wherein said a-pillar upper edge beam comprises a material having a tensile strength of not less than 2000Mpa comprising the following components in mass percent:
c0.3-0.37%, mn:0.3 to 1.1 percent, si:0.1 to 0.8 percent, cr:0.1 to 0.5 percent, B:0.001 to 0.005 percent of Ti:0.01 to 0.06 percent, mo:0.1 to 0.5 percent, and the balance of Fe and other unavoidable impurities.
3. A thermoformed door ring according to claim 1 wherein,
the B column lower edge beam is made of the following materials in parts by mass: c0.05-0.1%, mn:1.2 to 1.8 percent, si:0.1 to 0.6 percent, cr: < 0.2%, B:0.001 to 0.005 percent of Ti:0.01 to 0.05 percent, and the balance of Fe and unavoidable other impurities; and/or the number of the groups of groups,
the materials adopted by the lower side beam of the column A and the upper side beam of the column B comprise the following components in percentage by mass: 0.2 to 0.25 percent, mn:1.1 to 1.4 percent, si:0.1 to 0.35 percent, cr:0.15 to 0.3 percent, B:0.001 to 0.005 percent of Ti:0.01 to 0.06 percent, mo: less than 0.035%, and the balance of Fe and unavoidable other impurities.
4. A thermoformed door ring according to claim 1 wherein,
the thickness of the upper edge beam of the column A is 1.2-2.4 mm;
the thickness of the lower edge beam of the B column is 1.2-1.6 mm;
the thickness of the lower edge beam of the column A is 1.2-1.6 mm;
the thickness of the upper boundary beam of the B column is 1.4-2.4 mm.
5. A thermoformed door ring according to claim 1 wherein,
the lower side beam of the B column is made of a material with tensile strength not less than 1000 Mpa;
the lower side beam of the A column is made of a material with tensile strength not less than 1500 Mpa;
the B column upper side beam is made of a material with tensile strength not less than 1500 Mpa.
6. A method of manufacturing a thermoformed door ring according to any one of claims 1 to 5, comprising the steps of:
obtaining the material sheets required by the upper side beam of the A column, the lower side beam of the A column, the upper side beam of the B column and the lower side beam of the B column, and then stripping the material sheets;
positioning each material sheet through a splice welding fixture, and fixing each material sheet on the splice welding fixture;
sequentially welding the lower side beam of the A column, the upper side beam of the B column, the lower side beam of the B column and the lower side beam of the A column;
and after the splice welding is completed, forming the hot forming door ring.
7. The method for manufacturing a thermoformed door ring according to claim 6, wherein said sheet is heated in a heating furnace at 900-930 ℃ for 6-10 min;
the heated door ring material sheet is sent into a press for press forming.
8. The method of claim 7, wherein the transfer time from the heating furnace to the press is controlled within 10 seconds;
and/or the cooling speed of the stamping process is greater than 50 ℃/s, and the cooling end temperature is controlled to be 100-200 ℃;
and/or, continuously maintaining the pressure for 6-10 s after molding.
9. A method of manufacturing a thermoformed door ring according to claim 6 wherein,
the yield strength range after the hot stamping after the laser splice welding of the upper side beam of the A column and the lower side beam of the A column is 950-1250 MPa, the tensile strength range is 1300-1650 MPa, the elongation is 5-7%, and the A column is broken at the lower side beam of the A column;
the yield strength range of the A column upper edge beam and the B column upper edge beam after hot stamping after laser splice welding is 950-1250 MPa, the tensile strength range is 1300-1650 MPa, the elongation is 5-7%, and the B column upper edge beam is broken;
the yield strength range of the B column lower edge beam and the A column lower edge beam after hot stamping after laser splice welding is 800-1000 MPa, the tensile strength range is 1000-1250 MPa, the elongation is 5-7%, and the B column lower edge beam is broken;
the yield strength range of the B column lower side beam and the B column upper side beam after hot stamping after laser splice welding is 800-1000 MPa, the tensile strength range is 1000-1250 MPa, the elongation is 5-7%, and the B column lower side beam is broken.
10. A vehicle comprising a thermoformed door ring according to any one of claims 1 to 5.
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| CN202211449728.3A CN116902079A (en) | 2022-11-18 | 2022-11-18 | Thermoforming door ring, thermoforming door ring processing method and vehicle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117206613A (en) * | 2023-11-09 | 2023-12-12 | 凌云吉恩斯科技有限公司 | Full-automatic door ring splice welding production line and production method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117206613A (en) * | 2023-11-09 | 2023-12-12 | 凌云吉恩斯科技有限公司 | Full-automatic door ring splice welding production line and production method thereof |
| CN117206613B (en) * | 2023-11-09 | 2024-01-19 | 凌云吉恩斯科技有限公司 | Full-automatic door ring splice welding production line and production method thereof |
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