CN113926902B - Forming method of large-size integrated side wall outer plate - Google Patents
Forming method of large-size integrated side wall outer plate Download PDFInfo
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- CN113926902B CN113926902B CN202111046600.8A CN202111046600A CN113926902B CN 113926902 B CN113926902 B CN 113926902B CN 202111046600 A CN202111046600 A CN 202111046600A CN 113926902 B CN113926902 B CN 113926902B
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000003825 pressing Methods 0.000 claims abstract description 95
- 239000000463 material Substances 0.000 claims abstract description 46
- 238000004080 punching Methods 0.000 claims description 15
- 238000009966 trimming Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 abstract description 3
- 238000003672 processing method Methods 0.000 abstract 1
- 230000008569 process Effects 0.000 description 30
- 238000004519 manufacturing process Methods 0.000 description 10
- 238000005096 rolling process Methods 0.000 description 10
- 238000003466 welding Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/22—Deep-drawing with devices for holding the edge of the blanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/001—Shaping combined with punching, e.g. stamping and perforating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D35/00—Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00
- B21D35/002—Processes combined with methods covered by groups B21D1/00 - B21D31/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/08—Dies with different parts for several steps in a process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/88—Making other particular articles other parts for vehicles, e.g. cowlings, mudguards
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
The invention discloses a forming method of a large-size integrated side wall outer plate, which relates to the field of processing of the automobile side wall outer plate, wherein the drawing of the side wall outer plate is realized by using a drawing die, and a top cover side female die and an upper pressing plate are arranged in an upper die body of the drawing die; the lower die body is internally provided with a top cover side male die, a compressible movable large pressing ring and an outer pressing ring, and is also provided with a limiting block for limiting the moving path of the outer pressing ring; the top cover side male die corresponds to the top cover side female die; the outer pressing ring corresponds to the upper pressing plate; the purposes of changing the traditional processing method and improving the utilization rate of the blank materials of the parts are achieved through the drawing forming steps of S1, closing the pressing ring, S2, preliminary forming of the material plate and S3, drawing forming.
Description
Technical Field
The invention relates to the field of processing of automobile side wall outer plates, in particular to a forming method suitable for large-size integrated side wall outer plates.
Background
The side wall outer plate is a common outer covering piece on the automobile body, is the part with the largest size in all sheet metal parts of the automobile body, and has the characteristics of complex shape, multiple lap joint matching relations and the like.
Cold stamping is often adopted in traditional side wall forming schemes for drawing, the scheme is used for carrying out closed drawing along the circumference, the drawing depth is deeper, the size of a required blank material plate is large, the material plate utilization rate is high, but for oversized side walls, the large size of the part can cause the large size of the drawn blank material plate if the scheme is adopted for forming, and the coil width is beyond the normal rolling range of a common steel mill. Especially when the width dimension of the blank material plate coil exceeds 1800mm, raw material purchase is difficult and purchase cost is high. Meanwhile, the dimension of the die is too large, the weight of the die is overweight, the hoisting limit of an overhead crane of a production factory is easily exceeded, and the die is difficult to hoist and transport.
In order to solve the problem of oversized side wall stamping forming, the existing side wall adopts a split side wall scheme, namely an original integrated side wall outer plate is split into a plurality of parts, so that the sizes of the parts are reduced, and stamping forming is facilitated. And after the stamping is finished, splicing all parts into a whole by adopting CMT cold arc welding. But this scheme can lead to part quantity increase, leads to depositing material frame quantity increase, and production operating efficiency reduces, and the management degree of difficulty increases. Meanwhile, in order to ensure the quality of the whole side wall after welding, the requirement on the dimensional precision of the lap joint part of each part after split is increased, and the dimensional tolerance is increased to +/-0.2 mm, so that the stamping difficulty is increased greatly. In addition, a welding fixture is additionally arranged in a welding workshop, all the split parts are connected together, and the welding fixture cost projection and fixture installation space are increased.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a new technical scheme, and solves a series of problems caused by overlarge rolling width of a blank material in the prior art by improving the process structure during processing of the oversized side wall outer plate.
The specific scheme provided by the invention is as follows:
the forming method of the large-size integrated side wall outer plate comprises the steps of drawing the side wall outer plate by using a drawing die, wherein a top cover side female die and an upper pressing plate are arranged in an upper die body of the drawing die; the lower die body is internally provided with a top cover side male die, a compressible movable large pressing ring and an outer pressing ring, and is also provided with a limiting block for limiting the moving path of the outer pressing ring; the top cover side male die corresponds to the top cover side female die; the outer pressing ring corresponds to the upper pressing plate; the drawing operation comprises the following steps:
s1, closing a material pressing ring: placing a material plate, and preparing a drawing material plate by descending an upper die body until the upper die body is closed with a large material pressing ring, and simultaneously closing the upper material pressing plate with the outer material pressing ring;
s2, preliminary forming of a material plate: the upper die body continues to descend to drive the large pressing ring to descend until the material plate contacts with the top cover side male die and is formed preliminarily; simultaneously, the upper material pressing plate synchronously drives the outer material pressing ring to descend until the outer material pressing ring contacts with the limiting block to reach the limiting position;
s3, drawing and forming: the upper die body continuously descends to drive the large pressing ring to continuously descend, and the upper pressing plate and the outer pressing ring clamp the outer edge of the material plate and are fixed relative to the large pressing ring under the action of the limiting block; the upper die body drives the large pressing ring to move downwards to a dead point, the outer edge of the material plate is drawn and molded, and the top cover side male die and the top cover side female die are closed, so that the top cover side of the material plate is drawn and molded.
Furthermore, the top cover side female die is provided with a die fillet, and the radius of the die fillet is R, wherein R is more than or equal to 35mm.
Furthermore, a threshold side male die is further arranged in the lower die body, a threshold side female die matched with the threshold side male die is arranged in the upper die body, and the threshold side male die and the threshold side female die are closed to enable the threshold side of the material plate to be drawn and molded.
Further, in step S2, the upper pressing plate synchronously drives the outer pressing ring to descend until the outer pressing ring contacts with the limiting block to reach the limiting position, and the plane projection of the outer pressing ring and the threshold side male die is in a line.
Further, after the side wall outer plate is stretched by the drawing die, punching is performed by the stamping die provided with the straight trimming structure and the straight punching structure.
The beneficial effects achieved by adopting the technical scheme are as follows:
the structure of the side wall outer plate is changed through innovation of a drawing process scheme, the problem that steel plates are difficult to purchase due to the fact that the width of the oversized integrated side wall drawing blank plate exceeds the production limit of a steelworks is solved, meanwhile, the utilization rate of part blank materials is improved, the purchase cost of stamping straight materials is reduced, and further the production and manufacturing cost of the whole vehicle is reduced.
Through the innovation of deburring punching and flanging plastic process scheme, the problems that the die cannot be installed and the die is difficult to hoist and transport due to the fact that the size of the stamping die of the oversized integrated side wall is too large are solved.
By innovation of an integrated side wall stamping process scheme, the problems of increased management difficulty, long mold debugging period and the like caused by the fact that the number of parts is large in the split side wall outer plate scheme are solved; meanwhile, the integral side wall is integrally punched, welding is not needed to be carried out by adding a tool after welding, and the projection cost of the welded tool is reduced.
Drawings
Fig. 1 is a view showing an indication of a region on the roof side in the side body outer panel.
Fig. 2 is a cross-sectional view of B-B of fig. 1, showing a profiled contour of the top cover side.
Fig. 3 is a view showing the area on the rocker side in the rocker outer panel.
Fig. 4 is a cross-sectional view of C-C of fig. 3, showing a profiled contour of the rocker side.
Fig. 5 is a model display view of a drawing die.
Fig. 6 is a schematic diagram of the operation of the upper die body and the lower die body in the initial state in the first step.
Fig. 7 is a schematic diagram of the action of the upper die body approaching the large pressing ring in the second step.
Fig. 8 is a schematic diagram of the operation of the drawing die in the step-by-step molding of the third-step side body outer panel.
Fig. 9 is a state diagram of a drawing die after the third-step side body outer panel molding.
Fig. 10 is an indication diagram of trimming and punching the side outer panel.
Fig. 11 is an indication diagram of the shaping of the side wall outer panel.
FIG. 12 is an illustration of an indication of process limitations for a side body outer panel.
Wherein: the upper die body 10, the top cover side concave die 11, the threshold side concave die 12, the upper pressing plate 13, the lower die body 20, the top cover side convex die 21, the threshold side convex die 22, the outer pressing ring 23 and the large pressing ring 24.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
The embodiment discloses a forming method for a large-size integrated side wall outer plate, and solves the problems that raw material purchasing is difficult due to large rolling width of a blank material plate and the problems that a die cannot be installed and lifting and transferring of the die are difficult due to oversized die are difficult due to the fact that the conventional oversized side wall outer plate is produced by stamping.
Meanwhile, the invention solves the problems of increased management difficulty, long mold debugging period, increased welding tool cost and the like caused by the large number of parts in the split side wall outer plate scheme because the side wall outer plate adopts the integral stamping forming scheme.
In addition, through implementation of the technical scheme, the blank material utilization rate of the side wall outer plate during stamping can be improved, and the production and manufacturing capital of the whole automobile is further reduced.
In the molding method, a drawing die and a stamping die are required, wherein the drawing die is used for drawing and molding a blank plate (which can be understood as forming a side wall outer plate after drawing and punching the blank plate), and the stamping die is mainly used for punching and trimming the side wall outer plate after drawing and molding.
The size of the blank material plate is mainly determined by a drawing process, so that the invention starts from the drawing process to achieve the effect of improving the top cover side and the threshold side of the side wall outer plate, thereby reducing the required rolling width size of the blank.
(1) Improvement of drawing process of top cover side:
in order to ensure that the impact mark of the top cover side die does not enter the appearance surface, the conventional side wall drawing process usually makes the drawing depth deep (the depth is about 150 mm) during the drawing process so as to prevent the impact mark from entering the visible surface and affecting the appearance quality of the part.
The invention considers that the rolling width of the blank is reduced from the reduction of the drawing depth of the top cover side, but considers that the reduction of the drawing depth can lead the impact mark of the die mouth to enter the visible surface, thereby influencing the quality of the appearance surface of the top cover. In order to solve the influence of impact marks on the quality of the appearance surface, referring to fig. 1-2, the size of the die fillet on the side of the top cover is enlarged in the invention, namely, the die fillet on the side of the top cover of the upper die body 10 is enlarged to be about r=10 mm to be more than r=35 mm, and in order to achieve the purpose, the die 11 on the side of the top cover of the upper die body 10 is required to be designed with the R more than or equal to 35mm at the position corresponding to the die fillet.
By expanding the die fillet radius of the side wall outer plate in this way (the positions corresponding to the die fillets at the top cover side female die 11 and the top cover side male die 21 need to be synchronously expanded at the same time, so that the expansion of the die fillet of the side wall outer plate can be realized), the die fillet molding stress area of the top cover side is increased when the blank plate is drawn and molded, and even if the impact mark of the top cover side die fillet enters the appearance surface during drawing, the impact force is distributed due to the increase of the stress area, and only slight marks are left on the appearance surface; then coating is carried out to cover paint, and the impact mark can not be seen on the whole vehicle, so that the influence of the impact mark of the die orifice on the side of the top cover on the appearance quality of the part is avoided.
Through implementation of the scheme, the blank rolling width required by the pulling delay of the side wall outer plate can be reduced by about 30mm, and the drawing structure improvement of the top cover side in the scheme is shown in figures 1-2.
(2) Improvement of drawing process of threshold side
Referring to fig. 3-4, to avoid wrinkling of the side body skin rocker during drawing, conventional stamping process schemes have typically supplemented the process herein in a closed form to avoid such defects.
The stamping process scheme of the invention adopts an opening drawing process in combination with the shape characteristics of the part, so as to reduce the required rolling width size of the part blank. However, if the width of the coil of the material plate is only reduced, other drawing processes are supplemented to draw according to the traditional process scheme, and because the outer edge of the threshold side is not restrained in the forming process, wrinkling is necessarily generated inside the part, and the drawn part is unqualified.
Therefore, in order to avoid wrinkling defects during drawing of the outer edge of the side of the threshold, an upper pressing plate and an outer pressing ring are newly added on the upper die and the lower die respectively. In the drawing forming process, the outer edge of the part is clamped by the upper pressing plate of the upper die and the outer pressing ring of the lower die, so that wrinkling of the part of the drawing delay plate is avoided.
Specifically, in order to ensure that the material plate does not wrinkle when the drawing process is closed, the plane projection profile height difference of the large material pressing ring and the outer material pressing ring in an initial state is within +/-0.5 mm. Meanwhile, the contact time of the female die (comprising a top cover side female die and a threshold side female die) and the large pressing ring is consistent with that of the upper pressing plate and the outer pressing ring; it is understood that when the upper die body descends, the upper pressing plate in the upper die body is simultaneously closed with the outer pressing ring when the top cover side concave die and the threshold side concave die start to contact the large pressing ring.
Through implementation of the scheme, the outer drawing length of the side wall outer plate can be shortened, and the rolling width of the adopted blank is reduced by more than 80 mm.
In order to facilitate a more thorough understanding of the present solution, the following describes in detail the main structure of the drawing die and the specific drawing steps:
in the scheme, a drawing process of a side outer plate is realized by using a drawing die, specifically, referring to fig. 5, a top cover side concave die 11, a threshold side concave die 12 and an upper pressing plate 13 are arranged in an upper die body 10 of the drawing die; a top cover side male die 21, a threshold side male die 22, an outer pressing ring 23 and a compressible movable large pressing ring 24 are arranged in the lower die body 20, wherein a limiting block for limiting the moving path of the outer pressing ring 23 is also arranged on the lower die body 20, and the top cover side male die 21 corresponds to the top cover side female die 11, and the threshold side male die 22 and the threshold side female die 12; the outer press ring 23 corresponds to the upper press plate 13.
In the drawing forming process, the upper die body 10 descends towards the lower die body 20, and the female die (comprising the top cover side female die 11 and the threshold side female die 12), the upper pressing plate 13, the male die (comprising the top cover side male die 21 and the threshold side male die 22), the large pressing ring 24 and the outer pressing ring 23 clamp the blank plate together, so that the blank plate is prevented from wrinkling in the drawing forming process, and in addition, the female die and the male die perform further actions, so that the blank plate is drawn and formed into the shape of a side wall outer plate part; during this process, the upper platen 13 and the outer platen 23 will continuously clamp the blank sheet, preventing wrinkling of the outer edge at the threshold during drawing.
The specific drawing operation comprises the following steps:
the first step: referring to fig. 6, the blank plate is placed and the upper die body 10 is lowered until the upper die body 10 is closed with the large press ring 24, and at the same time, the upper press plate 13 is closed with the outer press ring 23.
It can be understood that firstly, the blank plate is placed on the large pressing ring 24, the positioning of the blank plate is completed by the large pressing ring 24, and the outer edge of the threshold position of the blank plate is just positioned on the outer pressing ring 23; it should be noted that, in order to ensure that the outer edge of the threshold of the blank plate can be located on the outer pressing ring 23, it is necessary to ensure that the difference of the plane projection profile heights of the outer pressing ring 23 and the large pressing ring 24 in the initial state is within ±0.5mm, so that the blank plate can be located on the large pressing ring 24 and the outer pressing ring 23 at the same time when the blank plate is placed.
And a second step of: referring to fig. 7, the upper die body 10 continues to descend until the upper die body 10 approaches the large pressing ring 24 and tightens the blank plate, continues to descend to drive the large pressing ring 24 to synchronously move downwards until the blank plate contacts the top cover side male die 21 and the threshold side male die 22 and is preliminarily molded; simultaneously, the upper pressing plate 13 synchronously drives the outer pressing ring 23 to descend until the outer pressing ring contacts with the limiting block to reach the limiting position; and (5) preliminary molding of the blank plate.
It will be appreciated that in the second step, the upper die body 10, the upper platen 13, and the punches (including the header-side punch 21, the threshold-side punch 22), the large platen 24, and the outer platen 23 are relatively moved closer together to clamp the blank plate, and a preliminary state of drawing forming (i.e., preliminary forming) is achieved.
It should be noted that, at this time, the blank plate is in a ready state, so when the blank plate is clamped by the upper pressing plate 13 and the outer pressing ring 23 and descends to the limiting position, under the action of the limiting block, the plane projection of the outer pressing ring 23 and the threshold side male die 22 is in a line, so that the subsequent external drawing can be synchronized with the top cover side and the threshold side; it is understood that in the actual drawing delay, the drawing of the top cover side, the threshold side and the outer edge needs to be synchronously performed, and the second step is the preparation action of the blank material plate.
And a third step of: a specific drawing forming operation is completed in the step; specifically, referring to fig. 8 to 9, the upper die body 10 continues to descend to drive the large press ring 24 to continue descending, at which time the upper press plate 13 and the outer press ring 23 clamp the outer edge of the blank plate, but at which time the upper press plate 13 and the outer press ring 23 clamp the blank plate stationary relative to the large press ring 24 due to the blocking restriction of the stopper; the upper die body 10 drives the large pressing ring 24 to continue to move down to the dead point, and at this time, the outer edge drawing forming, the top cover side male die 21 and the top cover side female die 11 are closed to draw forming of the top cover side of the material plate (i.e., blank plate), and the threshold side male die 22 and the threshold side female die 12 are closed to draw forming of the threshold side of the material plate (i.e., blank plate).
In the third step, the large press ring 24 is formed with a height difference from the outer press ring 23 when it goes down to the dead point, see fig. 9, and the existence of this height difference allows the outer edge structure of the rocker side to be changed, and the outer edge of the rocker side is no longer of a closed type design, compared with the conventional design, and the required rolling width of the blank plate is significantly shortened by such an open type design.
For an oversized integrated side wall outer plate, the size of a part is larger, so that the size of a stamping die in a later procedure is often oversized, the mounting range of a press workbench is exceeded, the weight of the die exceeds the lifting limit of a shop crown block, and the die cannot be carried; in order to solve the problem, the technical scheme is considered from the trimming and punching working procedure and the flanging and shaping working procedure respectively.
(1) Trimming and punching process scheme
When the stamping process scheme is designed, the stamping die is structurally improved, namely, the arranged stamping die is provided with a straight trimming structure and a straight punching structure, and the inclined wedge trimming or inclined wedge punching structure is not required to be arranged, so that the dimension of the stamping die in the length direction is not beyond the limit of a working table of a press, and the stamping die is convenient to install.
It should be noted that the straight trimming structure and the straight punching structure here need to be provided on the die corresponding to both side directions of the part, i.e., both left and right sides at (1) (2) in fig. 10.
(2) Flanging and shaping technological scheme
When the flanging and shaping process scheme is designed, the inclined wedge flanging and shaping process is avoided from being adopted on two sides (3) (4) in fig. 11) in the length direction of the part, otherwise, the inclined wedge structure is adopted, so that the size of the die is overlong; therefore, in the design stage of the part product, there is a need to put process restriction requirements on the product shape: the negative angle forming surface cannot be formed in the punching direction in the front and rear side regions of the side gusset (i.e., fig. 12 (5) (6)).
According to the technical scheme, the change of the structure of the side wall outer plate is formed through innovation of the drawing process scheme, the problem that steel plates are difficult to purchase due to the fact that the rolling width of the oversized integrated side wall drawing blank plate exceeds the production limit of a steelworks is solved, the utilization rate of part blank materials is improved, the purchase cost of stamping straight materials is reduced, and the production and manufacturing cost of the whole vehicle is further reduced.
Through the innovation of deburring punching and flanging plastic process scheme, the problems that the die cannot be installed and the die is difficult to hoist and transport due to the fact that the size of the stamping die of the oversized integrated side wall is too large are solved.
By innovation of an integrated side wall stamping process scheme, the problems of increased management difficulty, long mold debugging period and the like caused by the fact that the number of parts is large in the split side wall outer plate scheme are solved; meanwhile, the integral side wall is integrally punched, welding is not needed to be carried out by adding a tool after welding, and the projection cost of the welded tool is reduced.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The forming method of the large-size integrated side wall outer plate is characterized in that a top cover side female die (11) and an upper pressing plate (13) are arranged in an upper die body (10) of the drawing die; a top cover side male die (21), a compressible large pressing ring (24) and an outer pressing ring (23) are arranged in the lower die body (20), and a limiting block for limiting the moving path of the outer pressing ring (23) is also arranged on the lower die body (20); the top cover side male die (21) corresponds to the top cover side female die (11); the outer pressing ring (23) corresponds to the upper pressing plate (13); the top cover side female die (11) is provided with a die opening fillet, the radius of the die opening fillet is R, wherein R is more than or equal to 35mm, and the drawing operation comprises the following steps:
s1, closing a pressing ring: placing a material plate, and preparing the upper die body (10) to draw the material plate downwards until the upper die body (10) is closed with a large material pressing ring (24), and simultaneously closing the upper material pressing plate (13) with the outer material pressing ring (23);
s2, preliminary molding of a material plate: the upper die body (10) continues to descend to drive the large pressing ring (24) to descend until the material plate contacts with the top cover side male die (21) and is formed preliminarily; simultaneously, the upper pressing plate (13) synchronously drives the outer pressing ring (23) to descend until the outer pressing ring contacts with the limiting block to reach the limiting position;
s3, drawing and forming: the upper die body (10) continues to descend so as to drive the large pressing ring (24) to continue descending, and the upper pressing plate (13) and the outer pressing ring (23) clamp the outer edge of the material plate and do not move relative to the large pressing ring (24) under the action of the limiting block; the upper die body (10) drives the large pressing ring (24) to move downwards to a dead point, the outer edge of the material plate is drawn and molded, and the top cover side male die (21) and the top cover side female die (11) are closed to draw and mold the top cover side of the plate;
and after the side wall outer plate is stretched by using a drawing die, punching is performed by using a stamping die provided with a straight trimming structure and a straight punching structure.
2. The method for forming the large-size integrated side body outer panel according to claim 1, wherein a threshold side male die (22) is further arranged in the lower die body (20), a threshold side female die (12) matched with the threshold side male die (22) is arranged in the upper die body (10), and the threshold side male die (22) and the threshold side female die (12) are closed to enable the threshold side of the panel veneer to be drawn and formed.
3. The method for forming a large-sized integrated side body outer panel according to claim 2, wherein in step S2, the upper pressing plate (13) synchronously drives the outer pressing ring (23) to descend to a limit position when the outer pressing ring (23) contacts with a limit block, and the plane projection of the outer pressing ring (23) and the threshold side male die (22) is in a line.
4. The method for forming a large-size integrated side body outer panel according to claim 1, wherein the difference in plane projection profile height between the large pressing ring (24) and the outer pressing ring (23) in an initial state is within ±0.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111046600.8A CN113926902B (en) | 2021-09-07 | 2021-09-07 | Forming method of large-size integrated side wall outer plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111046600.8A CN113926902B (en) | 2021-09-07 | 2021-09-07 | Forming method of large-size integrated side wall outer plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113926902A CN113926902A (en) | 2022-01-14 |
| CN113926902B true CN113926902B (en) | 2023-11-03 |
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| CN110280663A (en) * | 2019-07-08 | 2019-09-27 | 湘潭大学 | A kind of top cover inner plate stamping die |
| CN110814173A (en) * | 2019-11-11 | 2020-02-21 | 中国第一汽车股份有限公司 | Side wall drawing die with differential stroke material pressing ring |
| CN111957800A (en) * | 2020-07-03 | 2020-11-20 | 中国第一汽车股份有限公司 | Die and method for controlling drawing formability of rear cover outer plate |
| CN112338034A (en) * | 2020-10-19 | 2021-02-09 | 中国第一汽车股份有限公司 | Drawing die and drawing method for semi-surrounded lower threshold type side wall outer plate |
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| JPH11319974A (en) * | 1998-05-11 | 1999-11-24 | Suzuki Motor Corp | Pressing method and pressed product |
| CN105945150A (en) * | 2016-05-25 | 2016-09-21 | 奇瑞汽车股份有限公司 | Vehicle body side outer plate drawing mold and drawing method |
| CN110280663A (en) * | 2019-07-08 | 2019-09-27 | 湘潭大学 | A kind of top cover inner plate stamping die |
| CN110814173A (en) * | 2019-11-11 | 2020-02-21 | 中国第一汽车股份有限公司 | Side wall drawing die with differential stroke material pressing ring |
| CN111957800A (en) * | 2020-07-03 | 2020-11-20 | 中国第一汽车股份有限公司 | Die and method for controlling drawing formability of rear cover outer plate |
| CN112338034A (en) * | 2020-10-19 | 2021-02-09 | 中国第一汽车股份有限公司 | Drawing die and drawing method for semi-surrounded lower threshold type side wall outer plate |
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| CN113926902A (en) | 2022-01-14 |
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