CN114083239A - High-strength new energy automobile blade battery tray frame beam and production process thereof - Google Patents
High-strength new energy automobile blade battery tray frame beam and production process thereof Download PDFInfo
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- CN114083239A CN114083239A CN202111401051.1A CN202111401051A CN114083239A CN 114083239 A CN114083239 A CN 114083239A CN 202111401051 A CN202111401051 A CN 202111401051A CN 114083239 A CN114083239 A CN 114083239A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 79
- 239000010959 steel Substances 0.000 claims abstract description 79
- 238000003466 welding Methods 0.000 claims abstract description 70
- 238000005096 rolling process Methods 0.000 claims abstract description 44
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 26
- 210000001503 joint Anatomy 0.000 claims abstract description 18
- 238000007493 shaping process Methods 0.000 claims abstract description 7
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000005452 bending Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 238000012360 testing method Methods 0.000 description 8
- 230000006698 induction Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000004080 punching Methods 0.000 description 6
- 239000011324 bead Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000003351 stiffener Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/20—Bonding
- B23K26/21—Bonding by welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
-
- 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
- B23K2101/36—Electric or electronic devices
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Engineering (AREA)
- Plasma & Fusion (AREA)
- Aviation & Aerospace Engineering (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention discloses a high-strength new energy automobile blade battery tray frame beam and a production process thereof. The feeding mechanism conveys the steel strip to a rolling forming area; gradually shaping the steel strip into a partially closed tubular structure in a roll forming area through a reinforcing rib roll forming die, wherein the inner side surface of the closed tubular structure is used as a reinforcing rib; welding the formed closed tubular structure and the butt joint of the steel strip through a laser welding machine; the welded steel strip is subjected to gradual reshaping of the unsealed part of the steel strip and butt joint of the sealed tubular structures through a sealed roll forming die, so that the steel strip forms two sealed tubular structures, and the two sealed tubular structures are separated by a reinforcing rib; welding the butt joint of the two closed tubular structures by a laser welding machine; and cutting off the steel belt which is subjected to secondary laser welding and has two closed tubular structures at intervals by the reinforcing ribs by an online sawing machine to obtain the blade battery tray frame beam. The invention strengthens the compressive strength in the frame beam and prolongs the service life.
Description
The technical field is as follows:
the invention belongs to the technical field of blade battery tray production, and particularly relates to a high-strength new energy automobile blade battery tray frame beam and a production process thereof.
Background art:
with the national emphasis on energy conservation and environmental protection, the development of new energy automobiles is more and more rapid. The blade battery adopting the lithium iron phosphate technology is applied to a new energy automobile by a manufacturer, in order to effectively protect the blade battery in work, the battery tray is indispensable, the rigidity of the welded frame beam of the existing battery tray is low, and how to design the frame beam of the battery tray is a problem to be solved.
The application number is "202110972628.8" patent application discloses a new energy automobile blade battery tray frame roof beam and production technology thereof, is the steel band integrated into a closed tubular structure to accomplish frame roof beam production through laser welding tubular structure butt joint department, through assembling corresponding frame roof beam and obtain battery tray frame. Because the frame roof beam is inside to be hollow structure, the frame roof beam will bear the whole weight of blade battery all the time, and after long-time the use, the small deformation that the frame roof beam pressurized produced accumulates gradually, finally makes the frame roof beam warp the damage, influences battery tray's life, how to strengthen the inside intensity of frame roof beam, extension battery tray life is the problem that needs the solution.
The invention content is as follows:
the invention aims to provide a high-strength new energy automobile blade battery tray frame beam and a production process thereof, so that the defects in the prior art are overcome.
In order to achieve the aim, the invention provides a production process of a high-strength new energy automobile blade battery tray frame beam, which comprises the following steps: (1) the feeding mechanism conveys the steel strip to a rolling forming area;
(2) gradually shaping the steel strip into a partially closed tubular structure in a roll forming area through a reinforcing rib roll forming die, wherein the inner side surface of the closed tubular structure is used as a reinforcing rib;
(3) welding the butt joint of the closed tubular structure formed in the step (2) and the steel strip through a laser welding machine;
(4) gradually shaping the unsealed part of the welded steel strip by a closed roll forming die to be butted with the closed tubular structure in the step (2) so that the steel strip forms two closed tubular structures, and separating the two closed tubular structures by the reinforcing ribs in the step (2);
(5) welding the butt joint of the two closed tubular structures in the step (4) by a laser welding machine;
(6) and cutting off the steel belt which is subjected to secondary laser welding and has two closed tubular structures at intervals by the reinforcing ribs by an online sawing machine to obtain the blade battery tray frame beam.
Preferably, in the technical scheme, the roll forming area has 28 roll forming dies, each roll forming die comprises an upper press roll and a lower press roll, a steel strip channel is arranged between the upper press roll and the lower press roll, forming structures are arranged on the upper press roll and the lower press roll, every four roll forming dies are in one group, the front five groups are reinforcing rib roll forming dies, and the rear two groups are closed roll forming dies.
Preferably, in the technical scheme, in the step (2), the steel strip is divided into an AB section, a BC section, a CD section, a DE section, an EF section, a Fi section, an iG section, a GH section, a HI section, an IJ section and a JK section, wherein the Fi section is equal to the iG section in length, the steel strip enters a first group of roll forming dies, the Fi section is bent outwards by a first roll forming die, the iG section is bent inwards, the Fi section and the iG section are respectively formed into arc structures, and the central angles of the Fi section and the iG section are 30 degrees; the second roll forming die bends the AB section and the BC section inwards at the B position, bends the HI section and the IJ section inwards at the I position, bends the IJ section and the JK section outwards at the J position, so that the B position, the I position and the J position are respectively of an arc line structure, the central angles of the B position and the J position are 30 degrees, and the central angle of the I position is 20 degrees; the third rolling forming die continuously bends the B part, the I part and the iG section inwards, bends the Fi section and the J part outwards, the central angle of the B part and the J part is 60 degrees, the central angle of the Fi section, the iG section and the I part is 50 degrees, the BC section and the CD section are bent inwards at the C part, the C part is in an arc line structure, and the central angle of the C part is 4 degrees; the fourth roll forming die continuously bends the positions B, C and I inwards and bends the position J outwards, the central angles of the positions B and J are 90 degrees, the central angle of the position I is 80 degrees, and the central angle of the position C is 8 degrees; the steel strip enters a second group of roll forming dies, a fifth roll forming die further bends the position C inwards, the central angle of the position C is 15 degrees, the GH section and the HI section are bent inwards at the position H, the position H is in an arc line structure, and the central angle of the position H is 15 degrees; the sixth roll forming die further bends the Fi section outwards and the iG section inwards, the central angles of the Fi section and the iG section are 55 degrees, the CD section and the DE section are bent inwards at the position D to enable the position D to be of an arc line structure, the central angle of the position D is 12 degrees, the DE section and the EF section are bent inwards at the position E to enable the position E to be of an arc line structure, and the central angle of the position E is 15 degrees; the seventh roll forming die further bends the positions C and H inwards, and the central angles of the positions C and H are 35 degrees; the eighth roll forming die further bends the positions D and E inwards, the central angle of the position D is 27 degrees, the central angle of the position E is 30 degrees, the DE section is bent outwards, the DE section is in an arc line structure, and the central angle of the DE section is 4 degrees; the steel strip enters a third group of roll forming dies, and a ninth roll forming die pair is further bent inwards at the C position, the H position and the I position, the central angle of the C position and the H position is 50 degrees, and the central angle of the I position is 90 degrees; the tenth roller forming die pair bends inwards continuously at the C position and the H position, and the central angles of the C position and the H position are 60 degrees; the No. eleven rolling forming die pair I continues to bend inwards and J continues to bend outwards, and the central angles of the position I and the position J are 95 degrees; the twelve-gauge rolling forming die pair D and E are further bent inwards, the central angle of the D is 37 degrees, and the central angle of the E is 35 degrees; the steel strip enters a fourth group of roll forming dies, a thirteen roll forming die pair D and E continue to bend inwards, the central angle of the D is 47 degrees, the central angle of the E is 50 degrees, the I continues to bend inwards, the central angle of the I is 100 degrees, and the J is reversely bent, so that the central angle of the J is reduced to 90 degrees from 95 degrees; a fourteen-gauge roll forming die pair I is reversely bent, so that the central angle of the position I is reduced to 90 degrees from 100 degrees; bending the No. fifteen rolling forming die inwards at the position E, wherein the central angle of the position E is 65 degrees; the sixteenth roll forming die further bends the position E inwards, and the central angle of the position E is 80 degrees; the steel strip enters a fifth group of roll forming dies, and a seventeen roll forming die continuously bends the position E inwards, and the central angle of the position E is 90 degrees; bending the eighteen rolling forming dies inwards at the position H, wherein the central angle of the position H is 75 degrees; the nineteen-roller forming die continuously bends the H part inwards, and the central angle of the H part is 85 degrees; the twenty-high rolling forming die continuously bends the H part inwards, the central angle of the H part is 90 degrees, at the moment, a JK section and a DE section on one side of the steel strip are in butt joint and closed, a part of the JK section, the IJ section, the HI section, the GH section, the iG section, the Fi section, the EF section and the DE section are enclosed to form a closed tubular structure, and the IJ section is used as a reinforcing rib.
Preferably, in the technical scheme, a laser welding machine is arranged between the fifth group of roll forming dies and the sixth group of roll forming dies, and in the step (3), when the steel strip runs into the laser welding machine, the laser welding machine performs laser welding on the joint of the JK section and the DE section through a laser welding head, so that the JK section is connected with the DE section to form a closed tubular structure.
Preferably, in the technical scheme, in the step (4), the steel strip enters a sixth group of roll forming dies, and the twenty-first roll forming die levels the DE section, so that the DE section is changed into a horizontal plane from an arc surface; the twenty-two rolling forming die further bends the position D inwards, and the central angle of the position D is 62 degrees; the twenty-third rolling forming die continues to bend the position D inwards, and the central angle of the position D is 77 degrees; the twenty-four rolling forming die continuously bends the position D inwards, and the central angle of the position D is 87 degrees; the steel strip enters a seventh group of rolling forming dies, and a twenty-fifth rolling forming die further bends the position C inwards, and the central angle of the position C is 75 degrees; the twenty-sixth rolling forming die continues to bend the C part inwards, and the central angle of the C part is 85 degrees; the twenty-seventh rolling forming die continues to bend the C part inwards, and the central angle of the C part is 90 degrees; and (3) further bending the position D inwards, wherein the central angle of the position D is 90 degrees, at the moment, an AB section and an IJ section on the other side of the steel strip are in butt joint and closed, the parts from the position D to the position K in the JK section, the IJ section, the AB section, the BC section, the CD section and the DE section enclose a closed tubular structure, and the closed tubular structure formed in the position and the closed tubular structure formed in the step (2) are separated through the IJ section.
Preferably, in the technical scheme, a laser welding machine is arranged between the seventh group of roll forming dies and the online sawing machine, and in the step (5), when the steel strip runs into the laser welding machine, the laser welding machine performs laser welding on the butt joint part of the AB section and the IJ section through a laser welding head, so that the AB section and the IJ section are connected to form a closed tubular structure.
Preferably, in the technical scheme, the production process further comprises a pre-punching process or a post-punching process; in the pre-punching process, a steel belt is pre-punched on a punch press through a pre-punching die before being fed into a rolling forming area; in the post-punching process, a punching machine or a laser cutting machine is arranged between the rolling forming area and the online sawing machine to form holes in the formed tubular structure.
A new energy automobile blade battery tray is formed by assembling high-strength new energy automobile blade battery tray frame beams into a tray frame.
Compared with the prior art, the invention has the following beneficial effects:
the frame beam after roll forming forms a reinforcing rib structure in the frame beam, so that the internal compressive strength of the frame beam is enhanced, and the service life of the blade battery tray made of the frame beam is prolonged. The two parts needing to be welded are subjected to laser welding, the widths of a laser welding seam and a thermal induction area are obviously reduced compared with other welding modes, the consistency of the overall mechanical performance of the frame beam is high while the high hardness is kept, and the strength of the frame beam is ensured.
Description of the drawings:
FIG. 1 is a schematic structural view of a section of a blade battery tray frame beam of the high-strength new energy automobile;
FIG. 2 is a production process flow chart of the blade battery tray frame beam of the high-strength new energy automobile;
FIG. 3 is a schematic structural diagram of a production line of a blade battery tray frame beam of the high-strength new energy automobile;
FIG. 4 is a front view of a first set of roll-forming dies of the invention;
FIG. 5 is a top view of a first set of roll-forming dies of the invention;
FIG. 6 is a right side view of a first set of roll-forming dies of the invention;
FIG. 7 is a diagram showing the shape change of a steel strip according to the first set of roll forming dies of the present invention;
FIG. 8 is a front view of a second set of roll-forming dies of the invention;
FIG. 9 is a top view of a second set of roll-forming dies of the invention;
FIG. 10 is a right side view of a second set of roll-forming dies of the invention;
FIG. 11 is a diagram showing the shape change of a steel strip corresponding to the second set of roll forming dies according to the present invention;
FIG. 12 is a front view of a third set of roll-forming dies of the invention;
FIG. 13 is a top view of a third set of roll-forming dies of the invention;
FIG. 14 is a right side view of a third set of roll-forming dies of the invention;
FIG. 15 is a diagram showing a change in shape of a steel strip according to the third group of roll forming dies of the present invention;
FIG. 16 is a front view of a fourth set of roll-forming dies of the invention;
FIG. 17 is a top view of a fourth set of roll-forming dies of the invention;
FIG. 18 is a right side view of a fourth set of roll-forming dies of the invention;
FIG. 19 is a diagram showing a change in shape of a steel strip according to a fourth group of roll forming dies of the present invention;
FIG. 20 is a front view of a fifth set of roll-forming dies of the invention;
FIG. 21 is a top view of a fifth set of roll-forming dies of the invention;
FIG. 22 is a right side view of a fifth set of roll-forming dies of the invention;
FIG. 23 is a drawing showing the shape change of a steel strip according to the fifth set of roll forming dies of the present invention;
FIG. 24 is a front view of a sixth set of roll-forming dies of the invention;
FIG. 25 is a top view of a sixth set of roll-forming dies of the invention;
FIG. 26 is a right side view of a sixth set of roll-forming dies of the invention;
FIG. 27 is a view showing a change in shape of a steel strip according to the sixth set of roll forming dies of the present invention;
FIG. 28 is a front view of a sixth set of roll-forming dies of the invention;
FIG. 29 is a top view of a sixth set of roll-forming dies of the invention;
FIG. 30 is a right side view of a sixth set of roll-forming dies of the invention;
FIG. 31 is a diagram showing a change in shape of a steel strip according to the sixth set of roll forming dies of the present invention;
FIG. 32 is a laser weld hardness test report of the present invention;
FIG. 33 is a high frequency weld hardness test report;
FIG. 34 is a graph of weld width and heat induction zone width for the present invention;
FIG. 35 is a graph of high frequency weld bead width and heat induction zone width.
The specific implementation mode is as follows:
the following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Example 1
As shown in fig. 2-3, a production process of a high-strength new energy automobile blade battery tray frame beam comprises the following steps: (1) the single-head coil frame uncoils a 300mm wide steel strip 1 and conveys the steel strip forward at a speed of 0-30m/min, the single-head coil frame levels the steel strip 1 at an outlet, and the steel strip 1 is conveyed to a rolling forming area 2;
(2) gradually shaping the steel strip 1 into a partially closed tubular structure in the rolling forming area 2 through a front-section rolling forming die, wherein the inner side surface of the closed tubular structure is used as a reinforcing rib; 28 roll forming dies 3 are arranged in the roll forming area 2, each roll forming die 3 comprises an upper roll 4 and a lower roll 4, a steel strip channel is arranged between the upper roll 4 and the lower roll 4, forming structures 5 are arranged on the upper roll 4 and the lower roll 4, every four roll forming dies 3 are in one group, the front five groups are reinforcing rib roll forming dies, and the rear two groups are closed roll forming dies;
as shown in fig. 4-7, the steel strip 1 is divided into an AB section, a BC section, a CD section, a DE section, an EF section, a Fi section, an iG section, a GH section, a HI section, an IJ section, and a JK section, wherein the Fi section is equal to the iG section in length, the steel strip 1 enters a first set of roll forming dies, a first roll forming die 6 bends the Fi section outwards through a forming structure 5, bends the iG section inwards, so that the Fi section and the iG section respectively form an arc structure, and the central angle of the Fi section and the iG section is 30 °; the second roll forming die 7 bends the AB section and the BC section inwards at the B position through the forming structure 5, bends the HI section and the IJ section inwards at the I position, bends the IJ section and the JK section outwards at the J position, so that the B position, the I position and the J position are respectively in an arc line structure, the central angles of the B position and the J position are 30 degrees, and the central angle of the I position is 20 degrees; the third roll forming die 8 continuously bends the B part, the I part and the iG part inwards through the forming structure 5, bends the Fi part and the J part outwards, the central angle of the B part and the J part is 60 degrees, the central angle of the Fi part, the iG part and the I part is 50 degrees, the BC part and the CD part are bent inwards at the C part, the C part is in an arc line structure, and the central angle of the C part is 4 degrees; the fourth roll forming die 9 continuously bends the positions B, C and I inwards and bends the positions J outwards through the forming structure 5, the central angles of the positions B and J are 90 degrees, the central angle of the position I is 80 degrees, and the central angle of the position C is 8 degrees;
as shown in fig. 8-11, the steel strip 1 enters a second set of roll forming dies, and a fifth roll forming die 10 further bends the C part inwards through a forming structure 5, the central angle of the C part is 15 degrees, a GH section and a HI section are bent inwards at the H part, the H part is in an arc line structure, and the central angle of the H part is 15 degrees; the sixth roll forming die 11 further bends the Fi section to the outer side and the iG section to the inner side through the forming structure 5, the central angles of the Fi section and the iG section are 55 degrees, the CD section and the DE section are bent to the inner side at the position D, the position D is formed into an arc structure, the central angle at the position D is 12 degrees, the DE section and the EF section are bent to the inner side at the position E, the position E is formed into an arc structure, and the central angle at the position E is 15 degrees; the seventh roll forming die 12 further bends the C and H inward through the forming structure 5, and the central angle of the C and H is 35 °; the eighth roll forming die 13 further bends the positions D and E inwards through the forming structure 5, the central angle of the position D is 27 degrees, the central angle of the position E is 30 degrees, the DE section is bent outwards, the DE section is in an arc line structure, and the central angle of the DE section is 4 degrees;
as shown in fig. 12 to 15, the steel strip 1 enters the third group of roll forming dies, and the ninth roll forming die 14 further bends inward at the positions C, H, and I by the forming structure 5, the central angles of the positions C and H are 50 °, and the central angle of the position I is 90 °; the tenth roll forming die 15 continuously bends the C position and the H position inwards through the forming structure 5, and the central angles of the C position and the H position are 60 degrees; the eleventh roll forming die 16 continuously bends the position I inwards and the position J outwards through the forming structure 5, and the central angles of the position I and the position J are 95 degrees; the twelve-roller forming die 17 is further bent inwards at positions D and E through the forming structure 5, the central angle of the position D is 37 degrees, and the central angle of the position E is 35 degrees;
as shown in fig. 16-19, the steel strip 1 enters a fourth group of roll forming dies, and a thirteenth group of roll forming dies 18 continuously bend inward at positions D and E through the forming structure 5, wherein the central angle of the position D is 47 degrees, the central angle of the position E is 50 degrees, the position I continuously bends inward, the central angle of the position I is 100 degrees, and the position J is reversely bent, so that the central angle of the position J is reduced from 95 degrees to 90 degrees; the fourteen-gauge rolling forming die 19 reversely bends the position I through the forming structure 5, so that the central angle of the position I is reduced to 90 degrees from 100 degrees; the fifteen-roller forming die 20 continuously bends the position E inwards through the forming structure 5, and the central angle of the position E is 65 degrees; the sixteen-numbered roll forming die 21 further bends the position E inwards through the forming structure 5, and the central angle of the position E is 80 degrees;
as shown in fig. 20-23, the steel strip 1 enters a fifth set of roll forming dies, and a seventeen roll forming die 22 continues to bend inwards at the position E through the forming structure 5, and the central angle of the position E is 90 degrees; the eighteen rolling forming dies 23 are further bent inwards at the position H through the forming structure 5, and the central angle of the position H is 75 degrees; the nineteen number rolling forming die 24 continuously bends the H part inwards through the forming structure 5, and the central angle of the H part is 85 degrees; the No. twenty rolling forming die 25 continuously bends the position H to the inner side through the forming structure 5, the central angle of the position H is 90 degrees, at the moment, a JK section and a DE section on one side of the steel strip 1 are in butt joint and closed, a part of the JK section, the IJ section, the HI section, the GH section, the iG section, the Fi section, the EF section and the DE section form a closed tubular structure, and the IJ section serves as a reinforcing rib;
(3) a first laser welding machine 26 is arranged between the fifth group of roll forming dies and the sixth group of roll forming dies, when the steel strip 1 runs into the first laser welding machine 26, the first laser welding machine 26 performs laser welding on the joint of the JK section and the DE section through a laser welding head with the power of 3KW and the focal length of 200mm, so that the JK section is connected with the DE section, and a closed tubular structure is formed as shown in FIG. 1; the air tightness of the laser welding seam is obviously improved compared with other welding modes, and the requirement on the air tightness of the blade battery can be met;
(4) gradually shaping the unclosed part of the welded steel strip 1 by a closed roll forming die to be in butt joint with the closed tubular structure in the step (2) so that the steel strip forms two closed tubular structures, and separating the two closed tubular structures by the reinforcing ribs in the step (2);
as shown in fig. 24-27, the steel strip 1 enters a sixth set of roll forming dies, and the twenty-first roll forming die 27 levels the DE section through the forming structure 5, so that the DE section is changed from a cambered surface to a horizontal surface; the twenty-two number rolling forming die 28 further bends the position D inwards through the forming structure 5, and the central angle of the position D is 62 degrees; twenty-third roll forming die 29 continues to bend inward at position D with a central angle of 77 ° by forming structure 5; the twenty-four number rolling forming die 30 continuously bends the position D inwards through the forming structure 5, and the central angle of the position D is 87 degrees;
as shown in fig. 28 to 31, the steel strip 1 enters a seventh group of roll forming dies, and a twenty-fifth roll forming die 31 further bends inward at a position C by a forming structure 5, and the central angle of the position C is 75 °; the twenty-sixth rolling forming die 32 continuously bends the position C inwards through the forming structure 5, and the central angle of the position C is 85 degrees; the twenty-seventh rolling forming die 33 continues to bend the C part inwards through the forming structure 5, and the central angle of the C part is 90 degrees; twenty-eight roll forming dies 34 are further bent inwards at the position D through a forming structure 5, the central angle of the position D is 90 degrees, at this time, the AB section and the IJ section on the other side edge of the steel strip 1 are in butt joint and closed, the parts from the position D to the position K in the JK section, the IJ section, the AB section, the BC section, the CD section and the DE section enclose a closed tubular structure, and the closed tubular structure formed in the position and the closed tubular structure formed in the step (2) are separated through the IJ section;
(5) a second laser welding machine 35 is arranged between the seventh group of roll forming dies and the online sawing machine 36, when the steel strip 1 runs into the second laser welding machine 35, the second laser welding machine 35 performs laser welding on the butt joint of the AB section and the IJ section through a laser welding head with the power of 3KW and the focal length of 200mm, so that the AB section and the IJ section are connected, and a closed tubular structure is formed as shown in FIG. 1;
(6) and cutting the steel strip 1 which is subjected to secondary laser welding and has two closed tubular structures at intervals by the reinforcing ribs by using an online sawing machine 36, wherein the cutting frequency of the online sawing machine 36 is 4 times/min, so that the blade battery tray frame beam is obtained.
Hardness test comparative test:
the steel strip is HC550/980DP, two steel strips with the same length are cut, one steel strip is subjected to laser welding, and the other steel strip is subjected to high-frequency welding for later use. As shown in fig. 32, 3 points 1, 2 and 3 are selected for the laser welding seam, wherein the point 1 is located at the lower part of the welding seam, the point 2 is located at the middle part of the welding seam, the point 3 is located at the upper part of the welding seam, the load retention time is 10 seconds under 200 g of test force, the hardness test is carried out, the hardness value HV at the point 1 is 497.8, the hardness value HV at the point 2 is 481.6, the hardness value HV at the point 3 is 489.6, and the average value is 489.67. As shown in fig. 33, 3 points, 1, 2 and 3, are selected for the high-frequency welding seam, the point 1 is located in the middle of the welding seam, the point 2 is located at the top of the welding seam, the point 3 is located at the lower part of the welding seam, under the test force of 200 grams, the load retention time is 10 seconds, the hardness test is carried out, the hardness value HV of the point 1 is 441.4, the hardness value HV of the point 2 is 441.5, the hardness value HV of the point 3 is 445, and the average value is 442.63. It can be seen that the weld hardness using laser welding is significantly higher than that of the weld by high-frequency welding.
Weld width and thermally induced zone width comparison:
the hardness ratio of the weld formed by the two welding modes in the experiment was compared, and the widths of the weld and the heat induction zone were measured. As shown in FIG. 34, the width L of the laser weld bead10.921mm, width L of the entire heat induction region and weld2Is 1.651 mm. As shown in FIG. 35, the width L of the high-frequency welding bead3Is 1.204mm, wherein the width L of the deformed area in the welding seam51.154mm, width L of the heat induction zone and the weld as a whole42.810 mm. Therefore, the deformation area of the high-frequency welding seam is large, the widths of the laser welding seam and the thermal induction area are obviously reduced compared with other welding modes, the consistency of the overall mechanical performance of the frame beam is high while high hardness is kept, and the strength of the frame beam is ensured.
The frame roof beam that has the strengthening rib compares with the frame roof beam bearing capacity that does not have the strengthening rib:
table 1 comparison of the load carrying capacity of the frame beam V64 with stiffeners and the frame beam V63 without stiffeners
As can be seen from Table 1, the frame beam V64 with the reinforcing ribs deforms when being subjected to 190KG pressure of 180-; the frame beam V63 without the reinforcing ribs deforms when being subjected to the pressure of 145-155KG and fails when being subjected to the pressure of 165-170 KG. Therefore, compared with the frame beam V63 without the reinforcing ribs, the frame beam V64 with the reinforcing ribs has the advantages that the bearing capacity is improved by 20-30%, the bearing capacity of the frame beam is obviously improved, and the application range of the frame beam is expanded.
Example 2
A high-strength new energy automobile blade battery tray frame beam is structurally shown in figure 1.
Example 3
A blade battery tray of a new energy automobile is assembled into a tray frame through frame beams as shown in figure 1.
Claims (8)
1. A production process of a high-strength new energy automobile blade battery tray frame beam comprises the following steps: (1) the feeding mechanism conveys the steel strip to a rolling forming area;
(2) gradually shaping the steel strip into a partially closed tubular structure in a roll forming area through a reinforcing rib roll forming die, wherein the inner side surface of the closed tubular structure is used as a reinforcing rib;
(3) welding the butt joint of the closed tubular structure formed in the step (2) and the steel strip through a laser welding machine;
(4) gradually shaping the unsealed part of the welded steel strip by a closed roll forming die to be butted with the closed tubular structure in the step (2) so that the steel strip forms two closed tubular structures, and separating the two closed tubular structures by the reinforcing ribs in the step (2);
(5) welding the butt joint of the two closed tubular structures in the step (4) by a laser welding machine;
(6) and cutting off the steel belt which is subjected to secondary laser welding and has two closed tubular structures at intervals by the reinforcing ribs by an online sawing machine to obtain the blade battery tray frame beam.
2. The production process of the high-strength new energy automobile blade battery tray frame beam as claimed in claim 1, characterized in that: the roll forming area is internally provided with 28 roll forming dies, each roll forming die comprises an upper press roll and a lower press roll, a steel strip channel is arranged between the upper press roll and the lower press roll, forming structures are arranged on the upper press roll and the lower press roll, every four roll forming dies are in one group, the front five groups are reinforcing rib roll forming dies, and the rear two groups are closed roll forming dies.
3. The production process of the high-strength new energy automobile blade battery tray frame beam as claimed in claim 2, characterized in that: in the step (2), the steel belt is divided into an AB section, a BC section, a CD section, a DE section, an EF section, a Fi section, an iG section, a GH section, a HI section, an IJ section and a JK section, wherein the Fi section and the iG section are equal in length, the steel belt enters a first group of rolling forming dies, the first group of rolling forming dies bend the Fi section outwards and bend the iG section inwards to enable the Fi section and the iG section to be of arc structures respectively, and the central angles of the Fi section and the iG section are 30 degrees; the second roll forming die bends the AB section and the BC section inwards at the B position, bends the HI section and the IJ section inwards at the I position, bends the IJ section and the JK section outwards at the J position, so that the B position, the I position and the J position are respectively of an arc line structure, the central angles of the B position and the J position are 30 degrees, and the central angle of the I position is 20 degrees; the third rolling forming die continuously bends the B part, the I part and the iG section inwards, bends the Fi section and the J part outwards, the central angle of the B part and the J part is 60 degrees, the central angle of the Fi section, the iG section and the I part is 50 degrees, the BC section and the CD section are bent inwards at the C part, the C part is in an arc line structure, and the central angle of the C part is 4 degrees; the fourth roll forming die continuously bends the positions B, C and I inwards and bends the position J outwards, the central angles of the positions B and J are 90 degrees, the central angle of the position I is 80 degrees, and the central angle of the position C is 8 degrees; the steel strip enters a second group of roll forming dies, a fifth roll forming die further bends the position C inwards, the central angle of the position C is 15 degrees, the GH section and the HI section are bent inwards at the position H, the position H is in an arc line structure, and the central angle of the position H is 15 degrees; the sixth roll forming die further bends the Fi section outwards and the iG section inwards, the central angles of the Fi section and the iG section are 55 degrees, the CD section and the DE section are bent inwards at the position D to enable the position D to be of an arc line structure, the central angle of the position D is 12 degrees, the DE section and the EF section are bent inwards at the position E to enable the position E to be of an arc line structure, and the central angle of the position E is 15 degrees; the seventh roll forming die further bends the positions C and H inwards, and the central angles of the positions C and H are 35 degrees; the eighth roll forming die further bends the positions D and E inwards, the central angle of the position D is 27 degrees, the central angle of the position E is 30 degrees, the DE section is bent outwards, the DE section is in an arc line structure, and the central angle of the DE section is 4 degrees; the steel strip enters a third group of roll forming dies, and a ninth roll forming die pair is further bent inwards at the C position, the H position and the I position, the central angle of the C position and the H position is 50 degrees, and the central angle of the I position is 90 degrees; the tenth roller forming die pair bends inwards continuously at the C position and the H position, and the central angles of the C position and the H position are 60 degrees; the No. eleven rolling forming die pair I continues to bend inwards and J continues to bend outwards, and the central angles of the position I and the position J are 95 degrees; the twelve-gauge rolling forming die pair D and E are further bent inwards, the central angle of the D is 37 degrees, and the central angle of the E is 35 degrees; the steel strip enters a fourth group of roll forming dies, a thirteen roll forming die pair D and E continue to bend inwards, the central angle of the D is 47 degrees, the central angle of the E is 50 degrees, the I continues to bend inwards, the central angle of the I is 100 degrees, and the J is reversely bent, so that the central angle of the J is reduced to 90 degrees from 95 degrees; a fourteen-roller forming die bends the position I reversely, so that the central angle of the position I is reduced from 100 degrees to 90 degrees; bending the No. fifteen rolling forming die inwards at the position E, wherein the central angle of the position E is 65 degrees; the sixteenth roll forming die further bends the position E inwards, and the central angle of the position E is 80 degrees; the steel strip enters a fifth group of roll forming dies, and a seventeen roll forming die continuously bends the position E inwards, and the central angle of the position E is 90 degrees; bending the eighteen rolling forming dies to the inner side of the H position, wherein the central angle of the H position is 75 degrees; the nineteen-roller forming die continuously bends the H part inwards, and the central angle of the H part is 85 degrees; the twenty-high rolling forming die continuously bends the H part inwards, the central angle of the H part is 90 degrees, at the moment, a JK section and a DE section on one side of the steel strip are in butt joint and closed, a part of the JK section, the IJ section, the HI section, the GH section, the iG section, the Fi section, the EF section and the DE section are enclosed to form a closed tubular structure, and the IJ section is used as a reinforcing rib.
4. The production process of the high-strength new energy automobile blade battery tray frame beam according to claim 3, characterized in that: and (3) arranging a laser welding machine between the fifth group of roll forming dies and the sixth group of roll forming dies, and performing laser welding on the joint of the JK section and the DE section by the laser welding machine through a laser welding head when the steel strip runs into the laser welding machine to connect the JK section and the DE section to form a closed tubular structure.
5. The production process of the high-strength new energy automobile blade battery tray frame beam as claimed in claim 4, characterized in that: in the step (4), the steel strip enters a sixth group of roll forming dies, and the twenty-first roll forming die levels the DE section, so that the DE section is changed from a cambered surface into a horizontal surface; the twenty-two rolling forming die further bends the position D inwards, and the central angle of the position D is 62 degrees; the twenty-third rolling forming die continues to bend the position D inwards, and the central angle of the position D is 77 degrees; the twenty-four rolling forming die continuously bends the position D inwards, and the central angle of the position D is 87 degrees; the steel strip enters a seventh group of rolling forming dies, and a twenty-fifth rolling forming die further bends the position C inwards, and the central angle of the position C is 75 degrees; the twenty-sixth rolling forming die continues to bend the C part inwards, and the central angle of the C part is 85 degrees; the twenty-seventh rolling forming die continues to bend the C part inwards, and the central angle of the C part is 90 degrees; and (3) further bending the position D inwards, wherein the central angle of the position D is 90 degrees, at the moment, an AB section and an IJ section on the other side of the steel strip are in butt joint and closed, the parts from the position D to the position K in the JK section, the IJ section, the AB section, the BC section, the CD section and the DE section enclose a closed tubular structure, and the closed tubular structure formed in the position and the closed tubular structure formed in the step (2) are separated through the IJ section.
6. The production process of the high-strength new energy automobile blade battery tray frame beam according to claim 5, characterized in that: and (5) arranging a laser welding machine between the seventh group of roll forming dies and the online sawing machine, and performing laser welding on the butt joint part of the AB section and the IJ section by the laser welding machine through a laser welding head when the steel strip runs into the laser welding machine to connect the AB section and the IJ section to form a closed tubular structure.
7. The utility model provides a high strength new energy automobile blade battery tray frame roof beam which characterized in that: produced by the process as claimed in any one of claims 1 to 6.
8. The utility model provides a new energy automobile blade battery tray which characterized in that: a pallet frame assembled from frame beams as claimed in claim 7.
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| US20200164820A1 (en) * | 2018-11-27 | 2020-05-28 | Shape Corp. | Galvonized multi-tubular beam and method of continuously forming the same |
| CN210805843U (en) * | 2019-08-05 | 2020-06-19 | 比亚迪股份有限公司 | Battery tray, power battery package and vehicle |
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Application publication date: 20220225 |