CN110293167B - SUV automobile back door outer plate drawing technical surface modeling method - Google Patents
SUV automobile back door outer plate drawing technical surface modeling method Download PDFInfo
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- 238000003825 pressing Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000004080 punching Methods 0.000 claims abstract description 15
- 238000004088 simulation Methods 0.000 claims abstract description 7
- 238000004458 analytical method Methods 0.000 claims description 20
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- 238000005728 strengthening Methods 0.000 description 2
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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
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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
- B21D22/26—Deep-drawing for making peculiarly, e.g. irregularly, shaped articles
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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
Abstract
The invention relates to a SUV automobile back door outer plate drawing technical surface modeling method, which comprises the following steps: (1) enlarging the clearance between the male die and the female die at the side walls of the pits with pit shape positions a, b, c and d, increasing the clearance between the male die and the female die at the side walls of the pits by 0.3mm for the material thickness t, and (2) carrying out forced pressure treatment on a material pressing surface g area in the whole circumference, wherein the forced pressure value is 0.05 mm; at the four corner f areas, the clearance between the female die and the blank holder is increased to 2mm from t-0.05 and gradually transits; (3) the areas h, k, i and j of the upper and lower junctions of the two ends of the license plate mounting position and the two tail lamp mounting positions are subjected to strong pressure treatment, the strong pressure value is 0.05mm, (4) the sizes of all process profile data of the drawing male die and the drawing female die in the direction X, Y, Z are all amplified by six parts per million, and (5) the flexibility compensation is carried out on the drawing male die according to the drawing process simulation on a punching machine. The invention solves the surface quality defects of wrinkling, cracking, pits and the like caused by insufficient dent resistance in the drawing forming process of the product.
Description
Technical Field
The invention relates to the field of automobile panel part manufacturing, in particular to a drawing technical surface modeling method for an outer plate of a rear back door of an SUV (sports utility vehicle).
Background
In the automobile body covering part, the development difficulty of the automobile back door outer plate is larger, and the automobile back door outer plate has the characteristics of larger overall dimension, thinner material, symmetrical profile, more complex fluctuation, deeper depth, higher requirements on surface quality and dimensional precision and the like, and easily has the defects of tensile crack, wrinkling, unclear ridge line, insufficient rigidity of a finished piece and the like in the stretching forming process.
The material thickness of the outer plate of the back door of the SUV is generally DC05 or DC06, the material thickness is generally 0.7mm or 0.8mm, the process is divided into 4 stamping processes to be completed, the 1 st process is drawing, the 2 nd process is trimming and punching, the 3 rd process is punching, flanging and the like, and the 4 th process is side punching, flanging and the like. Among them, the drawing step is an important step concerning the quality of the part to be formed.
In order to ensure the drawing quality, the digital model of the outer plate of the automobile back door needs to be subjected to process supplement, UG, CAD or CATIA software is utilized to extend the side line of a workpiece along a curved surface to form a smooth connecting surface and a closed box-shaped drawing part, and FIG. 1 is a drawing process surface of the outer plate of the automobile back door. And processing the molded surfaces of a male die, a female die and the like of the drawing die according to the technical surface data to carry out stamping production. The shape of the automobile back door outer plate is arranged according to the traditional drawing process of a large automobile covering part. After the punching direction is determined, a material pressing surface is arranged, the edge line of the workpiece extends along the curved surface to form a smooth connecting surface, a draw bead is arranged, and process profile compensation and strengthening treatment are not considered in the drawing process.
The prior art described above has the following disadvantages:
(1) surface indentation: the drawing technical surface of the outer plate of the back door is designed according to the method, the material flow is complex during drawing, the material is easy to generate plastic deformation by stamping the plate material, and the work hardening phenomenon occurs, so that the hardness of the material is increased, and the elongation is reduced; meanwhile, the thickness change of the formed plate is not uniform, the strong rigidity of the formed part is inconsistent, the integral rigidity and dynamic performance of the covering part are influenced, the critical instability conditions of all parts of the covering part are inconsistent, the collision energy absorption performance is changed, and the problems of surface product pits and insufficient rigidity are easy to occur;
(2) wrinkling: the size of the plate in the thickness direction and the size of the plate in the plane direction have larger difference, so that the thickness direction is unstable, and when the stress in the plane direction reaches a certain degree, the thickness direction is unstable, so that the wrinkling phenomenon is generated;
(3) cracking: the material is broken due to insufficient tensile strength, such as the breakage caused by excessive local stress near round corners of the convex die and the concave die;
(4) deformation of the die itself: when the large-scale die body is produced on a press machine, the large-scale die body can deform, so that the whole working molded surface has deviation with actual design data, and the extruded part is unqualified.
Disclosure of Invention
The invention aims to provide a drawing technical surface modeling method of an outer plate of an SUV back door, aiming at the defects in the prior art, and solving the surface quality defects of wrinkling, cracking, pits and the like caused by insufficient dent resistance in the drawing forming process of the outer plate of the back door of an automobile through process compensation and forced pressing treatment during the drawing technical surface modeling.
The technical scheme adopted by the invention for realizing the purpose is as follows: the SUV automobile back door outer plate drawing technical surface modeling method is characterized by comprising the following steps:
(1) enlarging the gap between a convex die and a concave die at the side wall of the concave pit with concave pit shape positions a, b, c and d on the periphery of the upper side of a rear glass installation position of the rear back door outer plate of the SUV, taking the concave die as a reference, namely the concave die is not changed, and increasing the gap between the convex die and the concave die at the side wall of the concave pit by 0.3mm for the thickness t, namely the gap between the convex die and the concave die at the side wall is t +0.3 mm;
(2) the method comprises the following steps that a pressure surface g area of the periphery of the outer contour of the SUV back door outer plate is subjected to pressure treatment, and the pressure value is 0.05 mm; the area of four corners f of the full-circumference pressing face ranges from 80 mm to 45 degrees, and the clearance between the female die and the blank holder is increased from t-0.05 to 2mm and gradually transits;
(3) the method comprises the following steps that areas h and k at the junctions of the outer edges of the two ends of the upper side line of the license plate mounting position of the outer plate of the rear back door of the SUV and the outer edges of the upper side lines of the inner sides of two tail lamp mounting positions are subjected to forced pressing treatment, wherein the forced pressing value is 0.05mm, the forced pressing area is arc-shaped, the arc takes the intersection point of the upper side line of the license plate mounting position and the upper side line of the inner side of the tail lamp mounting position as the circle center; the method comprises the following steps that areas i and j at the connecting positions of the upper ends of two bevel edges at the outer side of a license plate mounting position of an outer plate of a back door of the SUV and the lower end of the inner side of a corresponding tail lamp mounting position are subjected to forced pressing treatment, wherein the forced pressing value is 0.05mm, the forced pressing area is in the shape of an arc, the arc takes the intersection point of the upper end of the bevel edge at the outer side of the license plate mounting position and the lower end sideline at the inner side of;
(4) the sizes of all process molded surfaces of the drawing male die and the drawing female die in the direction of X, Y, Z are all enlarged by six ten-thousandth, and the deformation of the molded surfaces is integrally compensated;
(5) according to the simulation result of the drawing process of the back door outer plate on the press, performing deflection compensation on the drawing convex die: the method comprises the steps of introducing a process digital model of a back door outer plate and a mathematical model of punching machine equipment into analysis software, setting and networking parts of a male die, a female die and a blank holder, defining parameters such as materials, closing height and friction coefficient, carrying out deformation analysis simulation on a drawing male die in the drawing process to obtain deformation of each point on the molded surface of the drawing male die, then introducing deformation data into CATIA software, carrying out process compensation on a related deformation curved surface, and processing the drawing male die according to the compensated process surface.
The further technical scheme of the invention is as follows: in the step (2), the female die and the blank holder gap increasing transition section at four corner f areas of the full-circumference material pressing surface are in slope transition by 20 degrees and are connected by round corner surfaces of R8.
The drawing technical surface modeling method for the SUV automobile back door outer plate has the following beneficial effects:
1. for an extra-large SUV automobile back door outer plate with poor rigidity, the quality problems of rebound, large molded surface and large deviation of the external dimension and the detection tool after forming are avoided;
2. quality defects of depression, insufficient rigidity, cracking, wrinkling and the like of the SUV automobile back door outer plate are avoided;
3. through deflection analysis and compensation, the change of a molded surface caused by the deformation of the large-scale die body on a press machine is overcome, the surface quality of a workpiece is influenced, and the forming quality of the SUV automobile back door outer plate is ensured;
through CAE analysis in earlier stage, to drawing technology profile compensation, formulate the technology compensation scheme in the process design stage, the production is guided to the technique, and the mould debugging work load that significantly reduces shortens the intersection mould cycle of this kind of complicated covering mould of SUV car back door planking, promotes the surface quality of SUV car back door planking.
The method for forming the drawing technical surface of the back door outer plate of the SUV is further described below by combining the attached drawings and the embodiment.
Drawings
FIG. 1 is a structural schematic of a SUV automobile tailgate outer panel draw technical face;
FIG. 2 is a schematic structural view of an exterior panel product of a tailgate of an SUV vehicle;
FIG. 3 is a schematic view of the stamping direction of the outer panel of the rear door of the SUV vehicle and the center line of the die;
FIG. 4 is a schematic view of a drawing die assembly structure of an outer panel of a rear door of an SUV automobile;
FIG. 5 is a schematic diagram of the drawing punch and lower die holder structure of the outer panel of the rear back door of the SUV automobile;
FIG. 6 is a schematic diagram of the drawing punch, blank holder and lower die holder structures of the rear back door outer panel of the SUV automobile;
FIG. 7 is a schematic view of a draw blankholder configuration for an outer panel of a rear back door of an SUV vehicle;
FIG. 8 is a schematic view of a drawing die structure of an outer panel of a rear door of an SUV automobile;
FIG. 9 is a schematic drawing process plane view of the SUV back door outer plate drawing technical surface modeling method of the present invention;
FIG. 10 is an enlarged view at b of FIG. 9;
FIG. 11 is a sectional view taken along the line A-A of the drawing die at a position corresponding to that at b of FIG. 9;
FIG. 12 is an enlarged view at c of FIG. 9;
FIG. 13 is a sectional view in the direction A-A of the drawing die at a position corresponding to that at c of FIG. 9;
FIG. 14 is an enlarged view at d of FIG. 9;
FIG. 15 is a sectional view in the direction A-A of the drawing die at a position corresponding to that at d in FIG. 9;
FIG. 16 is an enlarged view at e of FIG. 9;
FIG. 17 is a sectional view in the direction A-A of the drawing die at a position corresponding to that at e in FIG. 9;
FIG. 18 is a diagram of the result of CAE rebound analysis of the SUV automobile back door outer panel forming;
FIG. 19 is a point cloud diagram of deflection analysis with 500T of upper pressure;
FIG. 20 is a point cloud diagram of deflection analysis with 600T of upward pressure;
FIG. 21 is a point cloud diagram of deflection analysis with 700T of upper pressure;
FIG. 22 is a point cloud diagram for deflection analysis with an upper pressure of 900T;
FIG. 23 is a deflection deviation contour plot;
the reference numbers illustrate: 1-female die, 2-male die, 3-blank holder, 4-lower die holder, 5-pressing surface, 6-tail lamp mounting position, 7-rear glass mounting position and 8-license plate mounting position.
Detailed Description
Fig. 2 is a three-dimensional diagram of a back door outer plate product, wherein the back door outer plate is mostly DC05 or DC06, the thickness of the material is generally 0.7mm or 0.8mm, the product is obtained through 4 stamping processes, the first process is drawing, the second process is trimming and punching, the third process is punching, flanging and the like, and the fourth process is side punching and flanging. Among them, the drawing step is an important step concerning the quality of the part to be formed.
Fig. 3 shows the punching direction of the back door outer plate and the die center line, the punching direction of each process is the same, the punching direction is opposite to the Z-axis, and the X, Y-axis is the die center line of each process.
The first stamping process of the product is a drawing process and is the most important forming process. When the drawing die works, the flat plate blank is placed on the blank holder of the lower die of the drawing die, and a drawn piece is obtained under the action of the press machine. Fig. 4 is a schematic diagram of a drawing die assembly structure of a back door outer plate, fig. 5 is a drawing male die and a lower die holder, and fig. 6 is an overall structure diagram of a drawing die lower die, wherein the drawing die lower die mainly comprises a male die, a blank holder and a lower die holder. FIG. 7 is a drawing die rim with a working profile corresponding to a nip surface. Fig. 8 is a drawing die. The invention relates to a SUV automobile back door outer plate drawing technical surface modeling method, which aims at the molded surface part of a back door outer plate drawing die.
The invention relates to a SUV automobile back door outer plate drawing technical surface modeling method which is characterized in that compensation and local strong pressure treatment of a profile of a back door outer plate are added on the basis of conventional technical modeling. The compensation of the molded surface aims at solving the defects of deformation, wrinkling, cracking and the like of a workpiece, and reverse compensation is carried out through analysis and prediction. The local forced pressing treatment means that in the local area of the molded surface of the die, the gap between the male die and the female die is smaller than the thickness of the material, so that the material is fully thinned, and the rigidity and the dent resistance of a workpiece are improved. Conventionally, the gap between the male die of the lower die and the female die of the upper die is a material thickness value.
The invention relates to a SUV automobile back door outer plate drawing technical surface modeling method, which comprises the following steps:
(1) enlarging the gap between a convex die and a concave die at the side wall of the concave pit with concave pit shape positions a, b, c and d on the periphery of the upper side of a rear glass installation position of the rear back door outer plate of the SUV, taking the concave die as a reference, namely the concave die is not changed, and increasing the gap between the convex die and the concave die at the side wall of the concave pit by 0.3mm for the thickness t, namely the gap between the convex die and the concave die at the side wall is t +0.3 mm; the three cross-sectional views shown in fig. 10-15 each increase the punch-to-die clearance of the sidewall by 0.3mm, where the increased male-to-female die clearance is intended to prevent cracking at the dimple shape.
The change of the modeling shape in the step (1) mainly comes from the CAE analysis, FIG. 18 is the CAE springback analysis result of the SUV automobile back door outer plate forming, wherein "-" in the figure indicates that the part is below the reference number model after springback, and "+" indicates that the part is above the reference number model after springback, and a, b and c in the figure correspond to the positions of a, b and c in FIG. 9. The part a rebounds outwards by 0.741, the part b rebounds outwards by 1.13, and the part c rebounds outwards by 1.24, so that the parts a, b and c are compensated relatively, the gap of the part is enlarged, and the pit shape is effectively prevented from cracking.
(2) The method comprises the following steps that a g area (a hatched area in figure 9) of a full-circumference pressure-bearing surface at the periphery of the outer contour of the back door outer plate of the SUV is subjected to pressure-bearing treatment, wherein the pressure-bearing value is 0.05mm, namely, the gap between a female die and a blank holder at the position is reduced, namely, the female die is used as a reference (the female die is not changed), the gap between the blank holder and the female die is the thickness (t) minus 0.05mm, namely, the gap is t-0.05 mm; the area of the f area of four corners of the full-circumference pressing surface is 80 mm-45 degrees, namely the f area is an isosceles right triangle, the two right-angle sides are 80 mm, and the included angle between the oblique side and the right-angle sides is 45 degrees; the clearance between the female die and the blank holder is increased to 2mm from t-0.05 at the f area and gradually transits; the female die and the blank holder gap increasing transition section at four corner f regions of the full-circumference pressing surface are in 20-degree slope transition and are connected by round corner surfaces of R8. The purpose of the step of forced pressing treatment is to improve the rigidity and the dent resistance of the workpiece; the purpose of increasing the gap at the f-zone is to improve the fluidity of the corner material and prevent the four corners of the part from wrinkling.
(3) The method comprises the following steps that areas h and k at the junction of outer edges of two ends of an upper side line of a license plate mounting position of an outer plate of a rear back door of the SUV and outer edges of upper side lines of two inner sides of two tail lamp mounting positions are subjected to forced pressing treatment, wherein the forced pressing value is 0.05mm, namely a female die is used as a reference (the female die is unchanged), the gap between a male die and the female die is the thickness (t) minus 0.05mm, the gap is t-0.05, the forced pressing area is in the shape of an arc, the arc takes the intersection point of the upper side line of the license plate mounting position and the upper side line of the inner side of the; the method comprises the following steps that areas i and j at the connecting positions of the upper ends of two bevel edges at the outer side of a license plate mounting position of an outer plate of a back door of the SUV and the lower end of the inner side of a corresponding tail lamp mounting position are subjected to forced pressing treatment, wherein the forced pressing value is 0.05mm, namely a female die is used as a reference (the female die is unchanged), the gap between a male die and the female die is the thickness (t) minus 0.05mm, the gap is t-0.05, the forced pressing area is in the shape of an arc, the arc takes the intersection point of the upper end of the bevel edge at the outer side of the license plate mounting position and the; the purpose of this step is to prevent the pull delay from cracking at the sharp point of the three-sided hand-over transition.
(4) The size of all process profile CAD data of the drawing male die and the drawing female die in the X, Y, Z direction is amplified by six ten-thousandth, and the profile deformation is integrally compensated; the purpose of the step is as follows: the deformation of an oversize covering piece of the back door outer plate caused by rebound and insufficient rigidity after the covering piece is pulled and extended is reduced.
(5) When the drawing die works to upset the bottom, the die body can be subjected to larger deformation force to generate certain deflection deformation, the deformation influences the actual gap between the male die and the female die in the die, and deflection analysis and compensation are necessary, and the deflection compensation is carried out on the drawing male die according to the drawing process simulation result of the back door outer plate on the press in the step: the method comprises the steps of introducing a process digital model of a back door outer plate and a mathematical model of punching machine equipment into analysis software, setting and networking parts of a male die, a female die and a blank holder, defining parameters such as materials, closing height and friction coefficient, carrying out deformation analysis simulation on a drawing male die in the drawing process to obtain deformation of each point on the molded surface of the drawing male die, then introducing deformation data into CATIA software, carrying out process compensation on a related deformation curved surface, and processing the drawing male die according to the compensated process surface to reduce the real deformation, namely deflection in the drawing process.
By varying the values of the various parameters, it can be seen that the deformation values are different. The nominal pressure of the press is 1200T (ton), the upper pressure is adjusted, and different deflection deformation is obtained through analysis. When the pressing-up is 500T (ton), the deflection value at the center is 0.18, and fig. 19 is the deflection analysis point cloud thereof. When the pressing-up is 600T, the deflection value at the center is 0.2, and fig. 20 shows the deflection analysis point cloud. When the pressing-up is 700T, the deflection value at the center is 0.24, and fig. 21 shows the deflection analysis point cloud. When the pressing-up pressure is 900T, the deflection value at the center is 0.33, and fig. 22 is the deflection analysis point cloud thereof. FIG. 23 is a deflection deviation contour line, and deflection deviations of points on the same contour line are the same, and compensation values are the same. According to the characteristic contour lines obtained by the deflection analysis, the process compensation is reversely carried out on the curved surface of the convex die in each area, for example, on the three lines in FIG. 23, the deflection compensation values are respectively 0.3mm, 0.2mm and 0. The flexibility deformation of the SUV automobile back door outer plate on the press machine is compensated, and the defects that the deformation of a large-scale die body causes the variation of the molded surface and influences the surface quality of a workpiece are overcome.
According to the drawing technical surface modeling method for the SUV automobile back door outer plate, the molded surfaces of the dies are processed, so that the debugging workload of the dies is reduced, and the surface quality defects of rebounding, collapsing, cracking and the like of punched products due to insufficient dent resistance are overcome. In a stamping workshop, four working procedures are totally divided, four stamping devices use flat plate blanks to sequentially stamp on a first mould, a second mould, a third mould and four pairs of moulds, the molded surfaces of the drawing moulds are subjected to process compensation and strengthening treatment, and the factors such as deflection deviation are considered, so that qualified back door outer plate products can be obtained.
The above embodiments are merely preferred embodiments of the present invention, and the present invention is not limited to the above embodiments, and any modifications, equivalents and the like, which are within the spirit and principle of the present invention, should be included in the protection scope of the present invention.
Claims (2)
- The SUV automobile back door outer plate drawing technical surface modeling method is characterized by comprising the following steps:(1) enlarging the gap between a male die and a female die at the side wall of a pit with pit-shaped positions a, b, c and d on the periphery of the upper side of a rear glass mounting position for forming an outer plate of a rear back door of an SUV (sports utility vehicle), taking the female die as a reference, namely the female die is not changed, and increasing the gap between the male die and the female die at the side wall of the pit by 0.3mm for the thickness t, namely the gap between the male die and the female die at the side wall of the pit is t +0.3 mm;(2) performing pressure treatment on a whole-circumference pressure surface g area on the periphery of the outer contour of the back door outer plate of the SUV, wherein the pressure value is 0.05mm, the gap between the female die and the pressure ring is reduced, and the gap between the pressure ring and the female die is the thickness t minus 0.05 mm; the areas of four corners f of the full-circumference pressing surface are within the range of 80 mm isosceles right triangles of two right-angle sides, and the gap between the female die and the blank holder is increased from t-0.05 mm to 2mm and gradually transits;(3) the method comprises the following steps that forced pressure treatment is carried out on areas h and k at the junction of the outer edges of two ends of the upper side line of the license plate mounting position of the outer plate of the rear back door of the SUV and the outer edges of the upper side lines of the inner sides of two tail lamp mounting positions, wherein the forced pressure value is 0.05mm, the gap between a male die and a female die at the junction is the thickness t minus 0.05mm, the forced pressure area is arc-shaped, the arc takes the intersection point of the upper side line of the license plate mounting position and the upper side lines of the inner sides of the tail; the method comprises the following steps that areas i and j at the connecting positions of the upper ends of two bevel edges at the outer side of a license plate mounting position of an outer plate of a rear back door of the SUV and the lower end of the inner side of a corresponding tail lamp mounting position are subjected to forced pressing treatment, wherein the forced pressing value is 0.05mm, the gap between a male die and a female die at the position is the thickness t minus 0.05mm, the forced pressing area is in an arc shape, the arc takes the intersection point of the upper end of the bevel edge at the outer side of the license plate mounting position and the lower end sideline;(4) the sizes of all process molded surfaces of the male die and the female die in the direction of X, Y, Z are all enlarged by six ten-thousandth, and the deformation of the molded surfaces is integrally compensated;(5) according to the drawing process simulation result of the back door outer plate on the punching machine, performing deflection compensation on the male die: the method comprises the steps of introducing a process digital model of a back door outer plate and a mathematical model of punching machine equipment into analysis software, setting and networking parts of a male die, a female die and a blank holder, defining parameters such as materials, closing height and friction coefficient, carrying out deformation analysis simulation on the male die in the drawing process to obtain deformation of each point on the molded surface of the male die, then introducing deformation data into CATIA software, carrying out process compensation on a related deformation curved surface, and processing the male die according to the compensated process surface.
- 2. The SUV automobile back door outer plate drawing technical surface modeling method according to claim 1, wherein the die and the binder ring gap increasing transition section at four corner f regions of the full-circumference binder surface in the step (2) are in 20-degree slope transition and are connected by a round corner surface of R8.
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| CN111922203B (en) * | 2020-07-06 | 2022-05-31 | 一汽奔腾轿车有限公司 | Stamping die structure for offsetting profile wave height points near ridge lines of stamping parts |
| CN112588921A (en) * | 2020-11-06 | 2021-04-02 | 安徽江淮汽车集团股份有限公司 | Automobile door outer plate stamping process and stamping die |
| CN112517725B (en) * | 2020-11-16 | 2022-07-29 | 东风汽车股份有限公司 | Front floor double-acting drawing die and using method thereof |
| CN113579046A (en) * | 2021-06-18 | 2021-11-02 | 柳州职业技术学院 | Method for molding drawing technical surface of outer plate of front side wall of automobile |
| CN113617916B (en) * | 2021-06-29 | 2023-05-26 | 柳州职业技术学院 | Design method for mold surface of outer plate of automobile tail door |
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| CN110293167A (en) | 2019-10-01 |
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