CN115255704A - Process optimization method for crack of tailor-welded joint of tailor-welded blank stamped parts with different thicknesses - Google Patents
Process optimization method for crack of tailor-welded joint of tailor-welded blank stamped parts with different thicknesses Download PDFInfo
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Abstract
The invention relates to a process optimization method for the crack of a tailor-welded joint of tailor-welded blank stamped parts with different thicknesses, which comprises the following steps: step one, confirming the forming state of a welding seam region stage, analyzing the stress states of the plate materials in different directions of the welding seam region, and confirming the drifting direction of the welding seam; adjusting the forming position of the plate, ensuring that the drift amount of the welding line in actual forming is close to the drift amount of the welding line in CAE analysis, and ensuring that the position of the welding line is fixed after forming; adjusting a female die corresponding to the welding seam area to avoid a molding gap value of the molded surface thick plate side, ensuring uniform stress of the molding of the thick plate side plate material near the welding seam, and ensuring reasonable drift amount of the welding seam; adjusting the joint vertical surface position of the thick plate avoiding surface and the thin plate avoiding surface of the forming concave die corresponding to the welding seam area, ensuring the feasibility of drifting of the thick plate side plate near the welding seam to the thin plate side, and ensuring the reasonable drifting direction of the welding seam; and step five, debugging, discharging and verifying in the production state. Effectively ensures the production stability of the laser tailor-welded blank stamping parts with different thicknesses.
Description
Technical Field
The invention relates to the technical field of automobile stamping, in particular to a process optimization method for the split welding seam cracking of a split welding plate stamping part with different thicknesses.
Background
Along with the continuous development of the automobile industry, the safety of the development of domestic automobiles is more and more emphasized, in order to improve the strength, the passenger car mostly adopts the unequal-thickness laser tailor-welded blank stamping parts, the unstable cracking and necking problem can occur in the tailor-welded seam area in the one-time forming process of the unequal-thickness laser tailor-welded blank stamping parts of parts with complex shapes, the existing debugging method generally comprises the steps of firstly carrying out material balance debugging, then carrying out forming fillet trimming, and finally carrying out material pressing stroke adjustment, the problem that the tailor-welded seam cracks and necks cannot be stably eliminated, and the problem that the tailor-welded seam cracks of the unequal-thickness laser tailor-welded blank stamping parts is not an effective solution.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the split weld seam of the unequal-thickness laser tailor-welded blank stamping part cannot be stably eliminated in the prior art, so that the process optimization method for the split weld seam of the unequal-thickness tailor-welded blank stamping part is provided.
A method for measuring the compression amount of sealing strips of a vehicle door and a door opening under the condition of a whole vehicle comprises the following steps:
the method comprises the following steps: confirming the forming state of the welding seam region stage, analyzing the stress states of the plate materials in different directions of the welding seam region, and confirming the drifting direction of the welding seam;
step two: adjusting the forming position of a plate, ensuring that the drift amount of a welding line in actual forming is close to the drift amount of the welding line in CAE analysis, and ensuring that the position of the welding line is fixed after forming;
step three: adjusting a female die corresponding to the welding seam area to avoid a molding gap value of the thick plate side of the molding surface, ensuring uniform molding stress of the thick plate side plate material near the welding seam and ensuring reasonable drift amount of the welding seam;
step four: adjusting the joint vertical surface position of the thick plate avoiding surface and the thin plate avoiding surface of the forming concave die corresponding to the welding seam area, ensuring the feasibility of drifting of the thick plate side plate near the welding seam to the thin plate side, and ensuring the reasonable drifting direction of the welding seam;
step five: and debugging, taking out and verifying in a production state.
Further, the first step specifically includes:
the method comprises the following steps: putting the welding plate into a mould which is formed by rib forming and process supplement forming and has no formed product shape, and confirming the external feeding and internal material gathering state after the mould is closed;
the first step is: confirming the drifting direction of the splicing seam when the shape of the product is formed to 1/2 position;
step one, three: continuing to perform product shape stage forming, increasing the forming depth by 5mm each time, and confirming the drifting direction of the splicing seam;
step one is as follows: when the forming depth of the product shape is 10mm, the forming depth is increased by 2mm each time, and the drifting direction of the splicing seam is confirmed;
step one and five: when the forming depth of the product shape is 5mm, the forming depth is increased by 1mm each time, and the drifting direction of the splicing seam is confirmed;
after the forming is finished, if the tailor-welded joint cracks, locking the forming depth value of the product shape according to the cracking starting point of the tailor-welded joint, confirming the influence of an external feeding state on the forming state of the internal tailor-welded joint in the stage process, confirming the influence of an internal supplementing material on the forming state of the internal tailor-welded joint in the stage process, and simultaneously confirming whether the drifting direction of the tailor-welded joint is consistent with that in CAE analysis;
and after the forming is finished, if the tailor-welded joint is not cracked, the material pressing force needs to be increased and the material pressing gap needs to be reduced to the thickness of the material, the forming state of the tailor-welded area is confirmed again, and whether the drifting direction of the tailor-welded joint is consistent with that in CAE analysis is confirmed again.
Furthermore, the increased material pressing force is increased by 10 to 30 percent based on the original material pressing force
Further, the second step specifically includes:
step two, firstly: locking the outline position of the plate under the shape bending state of the plate and the pressing surface;
step two: determining the center position of the plate according to the locked contour position of the plate;
step two and step three: comparing the seam drift amount in the CAE analysis with the seam drift amount in the tailor welding seam drift amount, and adjusting the center position of the plate material in the opposite direction when the deviation is larger;
after forming, if the drift amount of the splice welding seam is close to the drift amount of the welding seam in CAE analysis, and the crack of the splice welding seam is eliminated, the position adjustment of the plate is finished;
after forming, if the deviation of the splicing seam is still larger than the deviation of the welding seam in CAE analysis, and the cracking of the splicing seam is not eliminated, readjustment is carried out according to the theoretical deviation in CAE analysis of the splicing seam.
Further, the third step specifically includes:
step three, firstly: confirming a standard forming gap;
step three: confirming a forming clearance value of the female die avoiding profile thick plate side corresponding to a welding seam area, wherein the forming clearance value is generally T + (0.5-1.0) mm, and T is the thickness of the thick plate;
step three: according to the design of the forming clearance of the tailor-welded joint area, optimizing the forming clearance value of the female die avoiding molded surface thick plate side corresponding to the weld joint area to be T + (0.8-1.3) mm;
after forming, if the drift amount of the splicing seam is close to the drift amount of the welding seam in CAE analysis and the cracking of the splicing seam is eliminated, the forming clearance adjustment of the female die corresponding to the welding seam area on the side of the profile thick plate is completed;
after forming, if the deviation of the splicing welding seam is still larger than the deviation of the welding seam in CAE analysis, and the splicing welding seam cracking is not eliminated, optimizing the forming clearance value of the concave die avoiding molded surface thick plate side corresponding to the welding seam area to be T + (1.0-1.5) mm.
Further, the fourth step specifically includes:
step four, firstly: a female die avoiding surface corresponding to the splice joint area confirms that the joint vertical surface position of the thick plate avoiding surface and the thin plate avoiding surface of the forming female die corresponds to the splice joint position;
step four: confirming the distance from the joint vertical surface of the thick plate avoiding molded surface and the thin plate avoiding molded surface of the forming concave die corresponding to the welding seam area to the standard forming clearance surface of the thick plate, wherein the distance is generally (10-15) mm; confirming the distance from the joint vertical surface of the medium plate avoiding molded surface and the thin plate avoiding molded surface of the forming concave die corresponding to the welding seam area to the standard forming clearance surface of the thin plate, wherein the distance is generally (8-10) mm;
step four and step three: in the step forming process of the splicing welding seam region, modifying a concave die corresponding to the welding seam region to avoid the joint vertical surface position between the profile thick plate and the thin plate according to the splicing welding seam drifting amount of the cracking starting point of the splicing welding seam;
step four: the distance from the joint vertical surface of the thick plate hiding molded surface and the thin plate hiding molded surface of the forming concave die corresponding to the welding seam area to the standard forming clearance surface of the thick plate is increased to (15-20) mm; the distance from the joint vertical surface of the medium plate avoiding surface and the thin plate avoiding surface of the forming concave die corresponding to the welding seam area to the standard forming clearance surface of the thin plate is reduced to (3-5) mm;
after forming, if the drift amount of the splicing seam is close to the drift amount of the welding seam in CAE analysis and the cracking of the splicing seam is eliminated, the joint vertical face position adjustment of the thick plate hiding molded surface and the thin plate hiding molded surface of the forming concave die corresponding to the welding seam area is finished;
after forming, if the drift amount of the tailor-welded joint is not close to the drift amount of the weld joint in CAE analysis and the crack of the tailor-welded joint is not eliminated, the distance from the joint vertical surface of the medium-thick plate hiding profile and the thin plate hiding profile of the forming concave die corresponding to the weld joint area to the standard forming clearance surface of the thin plate is optimized to be increased to (8-10) mm.
Further, the fifth step specifically includes:
step five, first: verifying the workpiece outlet state by using special production equipment;
step five two: verifying the workpiece state by using a special different-thickness tailor-welded blank material for production;
step five and step three: carrying out the molding verification of the tailor-welded blank materials with different thicknesses by using the production speed of theoretical design;
step five and four: judging whether the crack of the tailor welded joint is eliminated;
the process of the split joint cracking of the unequal-thickness tailor-welded blank stamped parts is optimized;
and if not, carrying out the optimization work of the first step to the fifth step again.
A process optimization system for split joint cracking of different-thickness tailor-welded blank stamping parts, the system comprising: the device comprises a state confirmation module, a plate position adjusting module, a female die hiding profile, a thick plate side forming gap value adjusting module, a thick plate hiding profile and thin plate hiding profile joint vertical surface position adjusting module and a debugging module;
the state confirmation module is used for analyzing the stress states of the plate materials in different directions in the welding seam area and confirming the drifting direction of the welding seam; the plate position adjusting module ensures that the drift amount of the welding line in actual forming is close to the drift amount of the welding line in CAE analysis, and ensures that the position of the welding line is fixed after forming; the female die hiding molding surface thick plate side molding gap value adjusting module is used for ensuring that the thick plate side plate material near the welding seam is uniformly molded and stressed, and ensuring that the welding seam drifting amount is reasonable; the thick plate avoiding surface and the thin plate avoiding surface are connected with the vertical surface position adjusting module, so that the feasibility of drifting of thick plate side plates near the welding seam to the thin plate side is ensured, and the reasonable drifting direction of the welding seam is ensured; the debugging module is used for debugging, exporting and verifying in a production state.
An electronic device comprising a memory storing a computer program and a processor implementing the steps of any of the above methods when the processor executes the computer program.
A computer readable storage medium storing computer instructions which, when executed by a processor, perform the steps of any of the methods described above.
According to the technical scheme, based on CAE simulation analysis conclusion with reasonable forming degree and reasonable mould structure design, in the forming process of the laser tailor welded blank, on the premise of theoretically designed pressure control, theoretically designed pressure gap is used, the forming state of the tailor welded seam region is confirmed at first, then the forming position of a plate is adjusted, then a female die corresponding to the welding seam region is adjusted to avoid the forming gap value of the side of a profile thick plate, then the female die corresponding to the welding seam region is adjusted to avoid the position of a joint vertical face between the profile thick plate and the thin plate, finally, in the production state, debugging and part verification is carried out, if the split weld seam is not eliminated, according to the split weld seam state, the pressure force and the pressure gap are preferably adjusted, the acting force of external feeding and internal material supplement is balanced, the die corresponding to avoid the forming gap value of the side of the profile thick plate and the joint position of the profile avoiding plate in the forming female die corresponding to the welding seam region are adjusted, the forming gap value of the profile thick plate and the joint vertical face avoiding position of the thin plate are adjusted, the forming state of the split seam region is stabilized, the split seam forming state of the thick laser tailor welded blank is effectively eliminated, and the quality of the laser tailor welded stamped part is improved, and the laser tailor welded stamped part with qualified production.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a process optimization method for the split weld cracking of the split weld plate stamped parts with different thicknesses in the invention;
FIG. 2 is a schematic view of the confirmation of the forming state of the assembly weld zone in the present invention;
FIG. 3 is a schematic diagram of adjusting the forming position of the sheet material in the present invention;
FIG. 4 is a schematic view of a forming gap at the side of a concave die avoiding a thick plate of a molded surface in the invention;
FIG. 5 is a schematic view of the position of the vertical surface of the connection between the concave die avoiding the thick plate and the thin plate of the profile in the invention;
description of reference numerals:
1. the split welding seam is cracked; 2. Deviation of a drifting position of a splicing seam; 3. A sheet forming position;
4. theoretical forming position of the plate; 5. Forming a female die; 6. Forming a male die;
7. forming a joint vertical surface of the medium plate avoiding surface of the female die and the thin plate avoiding surface; 8. thick plate;
9. a thin plate; 10. Splicing the welding seams; 11. Forming a mold;
12. welding the plate materials; 13. Laser tailor-welded blank stamping parts with different thicknesses;
14. the split welding seam is cracked; 15. A rib; 16. Supplementing the process;
17. the shape of the product; 18. A mold closed position where the shape of the product is not formed;
19. an outer splice joint location; 20. Forming the shape of the product to a 1/2 position;
21. the position of the external splicing seam is designed in theory; 22. The position of an internal splice joint;
23. theoretically designed inner splicing seam positions; 24. Pressing noodles;
25. welding the outlines of the plate materials; 26. Welding the outlines of the plate materials;
27. a molded surface avoiding area in the forming die corresponding to the welding seam area in the tailor-welded blank;
28. the medium and thick plate avoiding surface of the forming female die is connected with the theoretically formed surface of the thick plate;
29. the sheet avoiding molded surface in the molding female die is connected with the theoretically molded surface of the sheet;
30. the sheet avoidance molded surface and the sheet theoretical molding molded surface joint in the molding female die extend to the direction of the sheet theoretical molding molded surface;
31. forming the position of the concave die medium and thick plate avoiding molded surface and the position of the thin plate avoiding molded surface after the joint vertical surface extends towards the thin plate side;
K. a split weld crack initiation point; k1, a feed-piercing starting point;
t, the thickness of the thick plate; L1/L2, two adjacent plate positioning lines;
L3/L4, and the other two adjacent plate positioning lines; o, splicing and welding the central position of the plate material;
o1, forming the center position of the molded surface of the mold; f. The drift direction of the splice joint;
f1, performing drifting in the opposite direction on the tailor welded joint; o2, adjusting the central position of the tailor-welded blank;
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, a method for measuring the compression amount of the sealing strip of the door and the door opening under the condition of the whole vehicle includes the following steps:
the method comprises the following steps: confirming the forming state of the welding seam area stage, analyzing the stress states of the plate materials in different directions of the welding seam area, and confirming the drifting direction of the welding seam;
step two: adjusting the forming position of a plate, ensuring that the drift amount of a welding line in actual forming is close to the drift amount of the welding line in CAE analysis, and ensuring that the position of the welding line is fixed after forming;
step three: adjusting a female die corresponding to the welding seam area to avoid a molding gap value of the thick plate side of the molding surface, ensuring uniform molding stress of the thick plate side plate material near the welding seam and ensuring reasonable drift amount of the welding seam;
step four: adjusting the joint vertical surface position of the thick plate avoiding surface and the thin plate avoiding surface of the forming concave die corresponding to the welding seam area, ensuring the feasibility of drifting of the thick plate side plate near the welding seam to the thin plate side, and ensuring the reasonable drifting direction of the welding seam;
step five: and debugging, discharging and verifying in a production state.
Firstly, using a tailor-welded blank for production, putting the tailor-welded blank into a forming die, gradually closing an upper die and a lower die of the die by using production equipment until the forming is completed, verifying external feeding and internal gathering states displayed in stages in the forming process, confirming whether the drifting direction and the position of a tailor-welded seam accord with the theoretical design, and simultaneously confirming whether the drifting amount of the tailor-welded seam accords with the theoretical design.
And then, on the premise of using the sheet size of the theoretical design, using the die positioning structure of the theoretical design to verify the forming position of the standard sheet in the die, and determining whether the current position of the standard sheet in the die meets the theoretical design requirement, wherein the offset size of the theoretical position of the standard sheet in the die is +/-1-2 mm, and the sheet position is reversely adjusted according to the tailor-welded joint drift offset.
Then, on the premise of theoretically designed material pressure control, whether a female die hiding profile thick plate side forming gap value corresponding to a tailor-welded seam region is T + (0.5-1.0) mm or not is confirmed by using a theoretically designed forming gap, according to the deviation amount of the tailor-welded seam drift amount and the tailor-welded seam drift amount in CAE analysis, the female die hiding profile thick plate side forming gap value corresponding to the tailor-welded seam region is optimized to be T + (0.8-1.3) mm, after forming, if the tailor-welded seam drift amount is close to the weld seam drift amount in CAE analysis and the tailor-welded seam crack is eliminated, the female die hiding profile thick plate side forming gap value corresponding to the weld seam region is adjusted, and if the tailor-welded seam drift amount and the tailor-welded seam drift amount in CAE analysis are still large and the tailor-welded seam crack is not eliminated, the female die hiding profile thick plate side forming gap value corresponding to the tailor-welded seam region is optimized to be T + (1.0-1.5) mm.
Then, on the premise of theoretically designed material pressure control, using the adjusted welding seam forming clearance, confirming whether the joint vertical surface position of the forming concave die medium plate hiding profile corresponding to the welding seam area and the sheet hiding profile is (10-15) mm, confirming whether the joint vertical surface of the forming concave die medium plate hiding profile corresponding to the welding seam area and the sheet hiding profile is (8-10) mm, modifying the joint vertical surface position of the forming concave die medium plate hiding profile corresponding to the welding seam area and the sheet vertical surface according to the forming state of the welding seam and the drifting state of the welding seam splicing seam, reducing the joint vertical surface position of the forming concave die medium plate hiding profile corresponding to the welding seam area and the sheet hiding profile to the vertical surface of the sheet standard forming clearance surface to be (15-20) mm, if the joint welding seam hiding profile of the forming concave die medium plate hiding profile corresponding to the welding seam area and the sheet hiding profile corresponding to the welding seam area is not increased to the joint vertical surface position of the concave die (15-20) mm), and if the joint welding seam hiding profile of the welding seam hiding profile corresponding to the welding seam hiding profile is increased to the standard forming concave die vertical surface, and the joint vertical surface of the welding seam splicing seam area is increased to the welding seam hiding profile, and the joint of the welding seam area and the welding seam area is increased to the joint of the sheet hiding profile and the joint of the welding seam area and the welding seam area is increased, and the joint of the forming concave die medium plate hiding profile is increased to be increased, and the joint of the forming concave die medium plate hiding profile.
Finally, under the premise of controlling the adjusted forming gap, the adjusted concave die is used for avoiding the position of the joint vertical surface between the profile thick plate and the thin plate, and under the production state, special production equipment is used, special production unequal-thickness tailor-welded blank materials are used, the theoretically designed production speed is used for carrying out unequal-thickness tailor-welded blank material forming verification, the split weld cracks are eliminated, and the process optimization of the split weld cracks of the unequal-thickness tailor-welded blank stamping parts is completed;
if the split weld is not eliminated, preferably adjusting the pressing force and the pressing gap according to the split weld state, balancing the acting force of external feeding and internal feeding, adjusting the die dodging profile thick plate side forming gap value corresponding to the weld area and the joint vertical face position of the die medium-thick plate dodging profile and the thin plate dodging profile corresponding to the weld area, and stabilizing the split weld forming state.
The crack defect of the tailor-welded joints of the laser tailor-welded blank stamping parts with different thicknesses is eliminated through the process optimization method and the working sequence.
In the process of forming the welding seam region, the position of a splice welding seam crack 1 has a drift position deviation 2 with the splice welding seam, and firstly, the stage forming state of the splice welding seam region is confirmed, as shown in fig. 2, namely, the specific steps of the first step are as follows:
the method comprises the following steps: using a tailor-welded blank 12 for production, putting the tailor-welded blank 12 into a forming die 11, closing an upper die and a lower die of the die by using production equipment, firstly, selecting a rib 15 for forming, performing process supplement 16 for forming, confirming a die closing position 18 with a product shape 17 not formed, confirming an external feeding state and an internal gathering state, and confirming a drifting direction and a position of an external tailor-welded seam 19;
the first step is: selecting rib forming 15, performing process supplement 16 forming, forming the product shape 17 to 1/2 position 20, confirming whether the drifting direction and position of the external splicing seam 19 are the same as the drifting direction and position of the external splicing seam 21 designed in theory, and confirming whether the drifting direction and position of the internal splicing seam 22 are the same as the drifting direction and position of the internal splicing seam 23 designed in theory;
step one is three: continuing the product shape stage forming, increasing the forming depth by 5mm each time, and simultaneously determining whether the drifting directions and positions of the external splicing seam 19 and the internal splicing seam 22 are the same as those of the theoretically designed external splicing seam 21 and internal splicing seam 23;
step one is: when the forming depth of the product shape 17 is 10mm, the forming depth is increased by 2mm each time, and the change of the drifting direction and the position of the external splicing seam 19 and the internal splicing seam 22 is gradually confirmed;
step one and five: when the forming depth of the product shape 17 is 5mm, the forming depth is increased by 1mm each time, and the variation of the drifting direction and the position of the external splicing seam 19 and the internal splicing seam 22 is continuously confirmed step by step;
when the forming is finished, if the splicing seam is cracked 14, locking the forming depth value of the product shape according to the splicing seam cracking starting point K, confirming the influence of an external feeding state on the forming state of the internal splicing seam in the stage process, confirming the influence of an internal puncture K1 supplementary material on the forming state of the internal splicing seam in the stage process, simultaneously confirming whether the drifting direction of the splicing seam is consistent with that in CAE analysis, if the splicing seam is not cracked, increasing 10-30% of material pressing force and reducing the material pressing gap to the thick plate material thickness T, carrying out the forming state confirmation of the splicing area stage again, and confirming whether the drifting direction of the splicing seam is consistent with that in CAE analysis again.
And when the plate forming position 3 deviates from the theoretical forming position 4 in the die, adjusting the plate forming position. As shown in fig. 3, namely, the specific steps of step two are as follows:
step two is as follows: on the premise that the tailor welded blank 12 is in shape with the pressing surface 24 of the forming die 11, the contour 25 of the tailor welded blank 12 is aligned with two adjacent blank positioning lines L1/L2 in the forming die 11, and whether the other two adjacent blank positioning lines L3/L4 are aligned with the contour 26 of the tailor welded blank 12 is verified.
When adjusting the position of the tailor-welded blank, when selecting two adjacent positioning lines of the blank in the forming mold to align, the tailor-welded seam area in the tailor-welded blank needs to be correspondingly adjusted to the molded surface avoiding area 27 in the forming mold.
Step two: if the profile of the tailor-welded blank is aligned with the positioning line of the blank in the forming die, the central position O of the tailor-welded blank is aligned with the central position O1 of the profile of the forming die, and the tailor-welded blank can be regarded as a theoretical state, and if the central position O is not aligned, the processes can be repeated and confirmed again until the theoretical state is achieved.
Step two and step three: adjusting the central position O of the tailor-welded blank in the opposite direction F1 according to the displacement direction F of the tailor-welded seam, forming the blank after adjusting the central position O2 of the tailor-welded blank, and if the drift position of the tailor-welded seam is not close to the theoretical design position and the split weld seam is not eliminated, adjusting the forming gap of the die corresponding to the thick plate side in the tailor-welded seam region.
Adjusting the forming clearance value of the female die avoiding profile thick plate side corresponding to the welding seam area from T +0.5 to T +1.0, as shown in figure 4, namely the concrete steps of the third step are as follows:
step three, first: and confirming the joint vertical surface position 7 of the medium plate hiding molded surface and the thin plate hiding molded surface of the forming concave die according to the positions of the laser tailor-welded blank stamping parts 13 in the forming concave die 5 and the forming concave die 6, wherein the thick plate hiding clearance value of the concave die hiding molded surface corresponding to the tailor-welded seams 10 of the thick plate 8 and the thin plate 9 is 0.5mm.
When the die avoiding profile thick plate side avoiding gap value corresponding to the thick plate 8 in the area of the tailor welded joint 10 is 0.5mm, the forming gap in theoretical design is T +0.5mm, and the tailor welded joint 10 can be guaranteed to effectively move in the thick plate forming process through the forming gap value.
Step three: and adjusting the hiding clearance value of the concave die hiding profile thick plate side corresponding to the splice welding seams 10 of the thick plate 8 and the thin plate 9 to be 0.8mm according to the splice welding seam drifting position deviation 2.
When the avoiding clearance value of the female die avoiding molded surface thick plate side corresponding to the thick plate 8 in the area of the tailor-welded joint 10 is adjusted to be 0.8mm, the forming clearance in theoretical design is T +0.8mm, and the drift position deviation 2 of the tailor-welded joint can be effectively optimized by the forming clearance value.
Step three: after forming, if the drift amount of the splicing seam is close to the drift amount of the welding seam in CAE analysis and the cracking of the splicing seam is eliminated, the forming clearance adjustment of the female die corresponding to the welding seam area on the side of the profile thick plate is completed; and if the deviation of the splicing welding seam is larger than the deviation of the welding seam in CAE analysis and the splicing welding seam cracking is not eliminated, optimizing the female die avoiding profile thick plate side forming clearance value corresponding to the welding seam area to be T +1.0mm.
When the forming clearance of the female die avoiding the side of the profile thick plate is adjusted, the adjustment is only carried out on a plane area, and the adjustment is not carried out on a transition area of an inclined plane, so that the adjustment is only carried out by local joint. If the split welding seam is not eliminated after the forming clearance of the corresponding mould on the thick plate side in the split welding seam area is adjusted, the joint vertical face position adjustment of the medium-thick plate hiding molded surface and the thin plate hiding molded surface of the forming concave mould is required.
Adjusting the vertical position 7 of the joint of the medium plate avoiding surface and the thin plate avoiding surface of the forming concave die corresponding to the welding seam area, as shown in fig. 5, namely the concrete steps of the fourth step are as follows:
step four, firstly: confirming a joint vertical surface position 7 of a medium plate hiding molded surface of a forming concave die and a thin plate hiding molded surface according to the positions of a laser welding plate stamping part 13 in the forming concave die 5 and the forming concave die 6, carrying out theoretical design position confirmation aiming at the joint vertical surface position 7 of the medium plate hiding molded surface of the concave die and the thin plate hiding molded surface in the process that the forming clearance value of the thick plate side of the concave die hiding molded surface is adjusted to be T +0.8 from T +0.5, and confirming that the distance from the joint vertical surface 7 of the medium plate hiding molded surface of the forming concave die and the thin plate hiding molded surface to the joint vertical surface 7 of the medium plate hiding molded surface of the forming concave die and the thick plate theoretical molded surface connecting point 28 is (10-15) mm; the distance from the joint vertical surface 7 of the medium plate hiding molded surface and the thin plate hiding molded surface of the forming concave die corresponding to the welding seam area to the joint 29 of the thin plate hiding molded surface and the theoretical forming molded surface of the thin plate in the forming concave die is 8-10 mm.
The position of a concave die avoidance molded surface middle thick plate side joint vertical surface 7 corresponding to the splicing welding seam 10 region accords with a theoretical design position.
Step four and step two: in the step forming process of the splicing seam region, according to the deviation 2 of the drifting position of the splicing seam, according to the joint vertical position 7 of the hiding profile of the medium plate of the forming concave die and the hiding profile of the thin plate, in the process that the forming clearance value of the side of the thick plate of the hiding profile of the concave die is adjusted to T +1.0 from T +0.8, according to the drifting amount of the splicing seam at the cracking starting point of the splicing seam, the joint vertical position between the thick plate of the hiding profile of the concave die and the thin plate corresponding to the welding seam region is modified, and the distance from the joint vertical position 7 of the hiding profile of the medium plate of the forming concave die and the thin plate corresponding to the welding seam region to the joint vertical position 28 of the hiding profile of the medium plate of the forming concave die and the theoretical forming profile of the thick plate is increased to (15-20) mm; the distance from the joint of the medium plate hiding molded surface and the thin plate hiding molded surface of the forming concave die corresponding to the welding seam area to the joint of the thin plate hiding molded surface and the theoretical forming molded surface of the thin plate in the forming concave die is 29 mm and is reduced to (3-5);
when the position of the joint vertical surface 7 of the avoiding profile of the medium plate of the forming die and the avoiding profile of the thin plate corresponding to the area of the tailor-welded joint 10 is adjusted to the position 31 after the joint vertical surface of the avoiding profile of the medium plate of the forming die and the avoiding profile of the thin plate extends towards the thin plate side, the drift position deviation 2 of the tailor-welded joint can be effectively optimized.
Step four and step three: after forming, if the drift amount of the splicing welding seam is close to the drift amount of the welding seam in CAE analysis and the splicing welding seam is cracked and eliminated, the position 31 of the joint vertical surface of the hiding profile of the medium plate and the hiding profile of the thin plate of the forming female die corresponding to the welding seam area is adjusted and finished after extending towards the thin plate side; and if the drifting amount of the tailor welded joint is not close to the drifting amount of the weld joint in CAE analysis and the tailor welded joint is not eliminated, optimizing the distance from a position 31, corresponding to the weld joint area, of the junction vertical surface of the hiding profile of the medium-thickness plate and the hiding profile of the thin plate of the forming concave die after extending towards the thin plate side to the standard forming clearance surface of the thin plate to be increased to be (8-10) mm.
When the distance from the joint vertical surface of the medium plate hiding molded surface and the thin plate hiding molded surface of the forming concave die corresponding to the welding seam area to the standard forming clearance surface of the thin plate is adjusted, the position of the joint 29 of the thin plate hiding molded surface and the theoretical forming molded surface of the thin plate in the forming concave die is extended to the joint 30 of the joint of the thin plate hiding molded surface and the theoretical forming molded surface of the thin plate in the forming concave die after the joint extends to the direction of the theoretical forming molded surface of the thin plate, and the position 31 of the joint vertical surface of the medium plate hiding molded surface and the theoretical forming molded surface of the forming concave die corresponding to the welding seam area after the joint vertical surface of the medium plate hiding molded surface and the theoretical forming molded surface of the thin plate extends to the thin plate side is not adjusted and only needs to be locally jointed.
If the split weld cracks are eliminated, debugging the verification step of the part under the production state, namely the concrete steps of the fifth step are as follows:
in the production state, special production equipment is used, the special variable-thickness tailor-welded blank material is used, and the theoretically designed production speed is used for verifying the forming of the variable-thickness tailor-welded blank material.
Step five, first: the production special equipment is used for verifying the state of the part, the change of the production equipment has great influence on the uniformity of the forming gap, and the effectiveness of the adjusted female die for avoiding the forming gap value of the thick plate side of the molded surface can be influenced.
Step five two: the special different-thickness tailor-welded blank material for production is used for verifying the blank state, the special different-thickness tailor-welded blank material has larger influence on the welding seam forming position, can deviate from the theoretical design state, and can influence the applicability of the joint vertical face position of the medium-thick plate hiding molded face and the thin plate hiding molded face of the forming concave die corresponding to the adjusted welding seam area.
Step five and step three: and (4) carrying out the molding verification of the tailor-welded blank with different thicknesses by using the production speed designed by theory, judging whether the split of the tailor-welded seam is eliminated, if the split of the tailor-welded seam is eliminated, finishing the process optimization of the split of the tailor-welded seam of the tailor-welded blank stamping part with different thicknesses, and if the split of the tailor-welded seam is not eliminated, carrying out the optimization work of the first step to the fifth step again.
Through the implementation of the process optimization method, the displacement position of the splicing seam of the unequal-thickness splicing welding plate stamping part reaches the theoretical design position, the splicing seam of the laser splicing welding plate stamping part is eliminated, the die hiding profile thick plate side forming gap value corresponding to the welding seam area is adjusted, the reasonable drift amount of the welding seam is ensured, the joint vertical face position of the forming die medium-thick plate hiding profile corresponding to the welding seam area and the thin plate hiding profile is adjusted, the reasonable drifting direction of the welding seam is ensured, in the production state, special production equipment is used, special unequal-thickness splicing welding plate materials are produced, and the splicing welding seam forming state is stabilized under the combined action of the production speed of theoretical design. The laser tailor-welded blank stamping part has the advantages that the production of the displacement deviation of the tailor-welded seam of the laser tailor-welded blank stamping part is effectively prevented, and the problem of split welding seam cracking of the laser tailor-welded blank stamping part is effectively controlled.
The invention also comprises a process optimization system for the split weld cracking of the split weld plate stamping parts with different thicknesses, which comprises the following steps: the device comprises a state confirmation module, a plate position adjusting module, a female die hiding profile, a thick plate side forming gap value adjusting module, a thick plate hiding profile and thin plate hiding profile joint vertical surface position adjusting module and a debugging module;
the state confirmation module is used for analyzing the stress states of the plate materials in different directions in the welding seam area and confirming the drifting direction of the welding seam; the plate position adjusting module ensures that the drift amount of the welding line in actual forming is close to the drift amount of the welding line in CAE analysis, and ensures that the position of the welding line is fixed after forming; the female die hiding molding surface thick plate side molding gap value adjusting module is used for ensuring that the thick plate side plate material near the welding seam is uniformly molded and stressed, and ensuring that the welding seam drifting amount is reasonable; the thick plate avoiding molded surface and the thin plate avoiding molded surface are combined with the vertical surface position adjusting module to ensure the feasibility of drifting of thick plate side plates near the welding line to the thin plate side and ensure the reasonable drifting direction of the welding line; the debugging module is used for debugging, exporting and verifying in a production state.
The invention also comprises an electronic device comprising a memory storing a computer program and a processor implementing the steps of any of the above methods when executing the computer program.
The invention also includes a computer readable storage medium for storing computer instructions which, when executed by a processor, perform the steps of any of the methods described above.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (10)
1. A process optimization method for the split weld cracking of the split weld plate stamped parts with different thicknesses is characterized by comprising the following steps:
the method comprises the following steps: confirming the forming state of the welding seam area stage, analyzing the stress states of the plate materials in different directions of the welding seam area, and confirming the drifting direction of the welding seam;
step two: adjusting the forming position of the plate, ensuring that the drift amount of the welding line in actual forming is close to the drift amount of the welding line in CAE analysis, and ensuring that the position of the welding line is fixed after forming;
step three: adjusting a female die corresponding to the welding seam area to avoid a molding gap value of the thick plate side of the molding surface, ensuring uniform molding stress of the thick plate side plate material near the welding seam and ensuring reasonable drift amount of the welding seam;
step four: adjusting the joint vertical surface position of the thick plate avoiding surface and the thin plate avoiding surface of the forming concave die corresponding to the welding seam area, ensuring the feasibility of drifting of the thick plate side plate near the welding seam to the thin plate side, and ensuring the reasonable drifting direction of the welding seam;
step five: and debugging, taking out and verifying in a production state.
2. The method according to claim 1, wherein the first step specifically comprises:
the method comprises the following steps: putting the welding plate into a mould which is formed by rib forming and process supplement forming and has no formed product shape, and confirming the external feeding and internal material gathering state after the mould is closed;
the first step is: confirming the drifting direction of the splicing seam when the shape of the product is formed to 1/2 position;
step one is three: continuing to perform product shape stage forming, increasing the forming depth by 5mm each time, and confirming the drifting direction of the splicing seam;
step one is as follows: when the forming depth of the product shape is 10mm, the forming depth is increased by 2mm each time, and the drifting direction of the splicing seam is confirmed;
step one and five: when the forming depth of the product shape is 5mm, the forming depth is increased by 1mm each time, and the drifting direction of the splicing seam is confirmed;
after the forming is finished, if the tailor-welded joint cracks, locking the forming depth value of the product shape according to the cracking starting point of the tailor-welded joint, confirming the influence of an external feeding state on the forming state of the internal tailor-welded joint in the stage process, confirming the influence of an internal supplementing material on the forming state of the internal tailor-welded joint in the stage process, and simultaneously confirming whether the drifting direction of the tailor-welded joint is consistent with that in CAE analysis;
and after the forming is finished, if the tailor-welded joint is not cracked, increasing the material pressing force and reducing the material pressing gap to the material thickness, confirming the forming state of the tailor-welded area at the stage again, and confirming whether the drifting direction of the tailor-welded joint is consistent with that in CAE analysis again.
3. The method of claim 2, wherein the increased nip pressure is increased by 10-30% based on the original nip pressure.
4. The method according to claim 1, wherein the second step specifically comprises:
step two, firstly: locking the outline position of the plate material under the shape bending state of the plate material and the material pressing surface;
step two: determining the center position of the plate according to the locked contour position of the plate;
step two and step three: comparing the seam drift amount in the CAE analysis with the seam drift amount in the tailor welding seam, and adjusting the center position of the plate material in the opposite direction when the deviation is larger;
after forming, if the drift amount of the splicing welding seam is close to the drift amount of the welding seam in CAE analysis, and the cracking of the splicing welding seam is eliminated, the position adjustment of the plate is finished;
after forming, if the deviation of the splicing seam is still larger than the deviation of the welding seam in CAE analysis, and the cracking of the splicing seam is not eliminated, readjustment is carried out according to the theoretical deviation in CAE analysis of the splicing seam.
5. The method according to claim 1, wherein the third step specifically comprises:
step three, firstly: confirming a standard forming gap;
step three: confirming a forming gap value of the female die avoiding profile thick plate side corresponding to a welding seam area, wherein the forming gap value is generally T + (0.5-1.0) mm, and T is the thickness of a thick plate material;
step three: according to the design of forming gaps of the tailor-welded seam region, optimizing the forming gap value of the female die corresponding to the weld seam region, which is kept away from the side of the profile thick plate, to be T + (0.8-1.3) mm;
after forming, if the drift amount of the splicing seam is close to the drift amount of the welding seam in CAE analysis and the cracking of the splicing seam is eliminated, the forming clearance adjustment of the female die corresponding to the welding seam area on the side of the profile thick plate is completed;
after forming, if the deviation of the splicing welding seam is still larger than the deviation of the welding seam in CAE analysis, and the splicing welding seam cracking is not eliminated, optimizing the forming clearance value of the concave die avoiding molded surface thick plate side corresponding to the welding seam area to be T + (1.0-1.5) mm.
6. The method according to claim 1, wherein the fourth step specifically comprises:
step four, firstly: a female die avoiding surface corresponding to the splice joint area confirms that the joint vertical surface position of the thick plate avoiding surface and the thin plate avoiding surface of the forming female die corresponds to the splice joint position;
step four and step two: confirming the distance from the joint vertical surface of the thick plate avoiding molded surface and the thin plate avoiding molded surface of the forming concave die corresponding to the welding seam area to the standard forming clearance surface of the thick plate, wherein the distance is generally (10-15) mm; confirming the distance from the joint vertical surface of the medium plate avoiding molded surface and the thin plate avoiding molded surface of the forming concave die corresponding to the welding seam area to the standard forming clearance surface of the thin plate, wherein the distance is generally (8-10) mm;
step four and step three: in the step forming process of the splicing welding seam region, modifying a concave die corresponding to the welding seam region to avoid the joint vertical surface position between the profile thick plate and the thin plate according to the splicing welding seam drifting amount of the cracking starting point of the splicing welding seam;
step four: the distance from the joint vertical surface of the thick plate hiding molded surface and the thin plate hiding molded surface of the forming concave die corresponding to the welding seam area to the standard forming clearance surface of the thick plate is increased to (15-20) mm; the distance from the joint vertical surface of the thick plate avoiding surface and the thin plate avoiding surface of the forming concave die corresponding to the welding seam area to the standard forming clearance surface of the thin plate is reduced to (3-5) mm;
after forming, if the drift amount of the splicing seam is close to the drift amount of the welding seam in CAE analysis and the cracking of the splicing seam is eliminated, the joint vertical face position adjustment of the thick plate hiding molded surface and the thin plate hiding molded surface of the forming concave die corresponding to the welding seam area is finished;
after forming, if the drift amount of the tailor welded joint is not close to the drift amount of the weld joint in CAE analysis and the tailor welded joint crack is not eliminated, optimizing the distance from the joint vertical surface of the medium-thick plate hiding profile and the thin plate hiding profile of the forming concave die corresponding to the weld joint area to the standard forming clearance surface of the thin plate to be increased to (8-10) mm.
7. The method according to claim 1, wherein the step five specifically comprises:
step five: verifying the workpiece outlet state by using special production equipment;
step two: verifying the workpiece state by using the special variable-thickness tailor-welded blank material for production;
step five and step three: carrying out the molding verification of the tailor-welded blank materials with different thicknesses by using the production speed of theoretical design;
step five four: judging whether the crack of the tailor welded joint is eliminated;
finishing the process optimization of the split weld cracking of the split weld plate stamped parts with different thicknesses;
and if not, carrying out the optimization work of the first step to the fifth step again.
8. The utility model provides a process optimization system that varies thickness tailor-welded blank stamping workpiece splice seam ftracture, a serial communication port, the system includes: the device comprises a state confirmation module, a plate position adjusting module, a female die hiding profile, a thick plate side forming gap value adjusting module, a thick plate hiding profile and thin plate hiding profile joint vertical surface position adjusting module and a debugging module;
the state confirmation module is used for analyzing stress states of the plate materials in different directions in the welding seam area and confirming the drifting direction of the welding seam; the plate position adjusting module ensures that the drift amount of the welding line in actual forming is close to the drift amount of the welding line in CAE analysis, and ensures that the position of the welding line is fixed after forming; the female die avoidance type surface thick plate side forming gap value adjusting module is used for ensuring that the thick plate side plate material near the welding seam is uniformly formed and stressed, and ensuring that the welding seam drifting amount is reasonable; the thick plate avoiding molded surface and the thin plate avoiding molded surface are combined with the vertical surface position adjusting module to ensure the feasibility of drifting of thick plate side plates near the welding line to the thin plate side and ensure the reasonable drifting direction of the welding line; the debugging module is used for debugging, exporting and verifying in a production state.
9. An electronic device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method according to any one of claims 1-7 when executing the computer program.
10. A computer-readable storage medium storing computer instructions, which when executed by a processor, perform the steps of the method of any one of claims 1 to 7.
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