Composite die and method for shaping and trimming vehicle body side outer panel

Abstract

The present application relates to a composite die and method for shaping and trimming a vehicle body side outer panel, belonging to the field of automotive stamping processing technology. The composite die for shaping and trimming a vehicle body side outer panel comprises a lower die, on which a shaping movable punch is provided, the shaping movable punch being provided with a loading surface and a pressing surface, and a shaping and trimming groove located between the loading and pressing surfaces, the shaping and trimming groove having a shaping surface and a shearing surface; an upper die, on which a pressing plate for cooperating with the loading surface, a pressing block for cooperating with the pressing surface, and an inclined wedge shaping and trimming insert for sliding into the depth direction of the shaping and trimming groove, the inclined wedge shaping and trimming insert being provided with an extrusion surface for cooperating with the shaping and trimming groove, and a blade edge for cooperating with the shearing surface. The invention can realize the combination of the fine trimming process and the shaping process into one process, reducing the process steps and lowering the mold manufacturing cost and production cost.

Description

Technical Field

[0001] The present application relates to the technical field of automobile stamping processing, and in particular to a composite mold and method for shaping and trimming the side outer panel of a vehicle body. Background Art

[0002] The integral side panels of passenger cars are the most challenging body panels to manufacture. Due to their large size and the proximity of their edges to multiple environmental components, they demand high assembly precision and surface quality. The front end of the side panel's A-pillar overlaps the windshield and is adjacent to the fender, creating a complex structure that demands high dimensional accuracy and appearance quality, making it prone to defects such as stamping cracking and wrinkling.

[0003] At present, there are basically three traditional stamping processes for achieving the structural features of the front end of the side A-pillar.

[0004] Option 1: See Figure 3 As shown, the first process OP1 is to expand the negative angle area and draw it into shape; the second process OP2 is to refine it to the product contour; and the third process OP3 is to wedge-shape it to the final product structural features.

[0005] Solution 1 requires three steps to complete. This process suffers from a significant change in the cross-sectional length of the front end of the side A-pillar. During the shaping process, the material forms freely, with uncontrollable flow. This leads to wrinkles at the interface with the windshield and on the sidewall of the front end of the side A-pillar, compromising assembly precision and appearance quality requirements.

[0006] Option 2: See Figure 4 As shown, in the first step, OP1, the negative angle area of ​​the product in the stamping direction is expanded and drawn. In the second step, OP2, this area is roughly trimmed, removing most of the supplementary drawing features. In the third step, OP3, under the conventional pressure structure of the product area, an elastic pressure structure with an inclined wedge is designed in the area of ​​the supplementary drawing features left by the rough trimming in the second step, OP2. The inclined wedge is used to shape the negative angle expansion feature in this area into the product feature. In the fourth step, OP4, the inclined wedge mechanism is used to fine-tune the remaining material in this area to the final product contour. This solution requires four steps to complete.

[0007] Option 2 designs an outer elastic pressing structure in the wedge shaping process. The pressing is stable and easy to adjust. During the shaping process, it can effectively restrict the free flow of materials, reduce the risk of wrinkling defects, and help ensure the quality of parts. However, it requires an additional finishing process. The overall solution requires four steps to implement.

[0008] Option 3: See Figure 5 and Figure 6As shown, in the first process, OP1, the negative angle area of ​​the product in the stamping direction is expanded and drawn. In the second process, OP2, this area is roughly trimmed, removing most of the supplementary features for the draw process. In the third process, OP3, under the conventional pressure structure in the product area, a rigid pressure structure with an inclined wedge is designed in the waste area of ​​the supplementary features left after the rough trimming in the second process, OP2. The trimming insert 200 is mounted on the shaping insert 300, which is mounted on the inclined wedge. The inclined wedge is used to shape the negative angle expansion feature in this area into the product feature, and the remaining material in this area is fine-tuned to the final product contour. This solution requires three process steps to complete.

[0009] Option 3 incorporates a rigid clamping block 400 during the wedge shaping process. This constrains material flow during the shaping process, reducing the risk of wrinkling defects and ensuring part quality while also completing fine trimming. While Option 3 eliminates one step compared to Option 2, its use of a rigid clamping block 400 and a trimming punch 500 for rigid clamping provides limited adjustment flexibility. Furthermore, after stamping is completed and the upper die retracts, the trimming insert 200 is prone to carrying material. Summary of the Invention

[0010] In response to the shortcomings or one of the shortcomings of the above-mentioned background technology, an embodiment of the present application provides a composite mold and method for shaping and trimming the side outer panel of the vehicle body. For the front end structure of the side A-pillar, it can combine the fine trimming process content and the shaping process content into one process, reduce the process steps, and reduce the mold manufacturing cost and production cost.

[0011] In a first aspect, an embodiment of the present application provides a composite mold for shaping and trimming a vehicle body side outer panel, comprising:

[0012] A lower die is provided with a shaping movable punch, the shaping movable punch is provided with a material loading surface and a material pressing surface, and a shaping trimming groove located between the material loading surface and the material pressing surface, the shaping trimming groove having a shaping surface and a shearing surface;

[0013] The upper mold is provided with a pressing plate for cooperating with the loading surface, a pressing block for cooperating with the pressing surface, and a beveled wedge shaping and trimming insert for sliding into the depth direction of the shaping and trimming groove. The beveled wedge shaping and trimming insert is provided with an extrusion surface for cooperating with the shaping and trimming groove, and a blade edge for cooperating with the shear surface.

[0014] In a first aspect, in some embodiments, in the sliding direction of the oblique wedge shaping and trimming insert, the shaping surface has a shaping start point and a shaping end point, and the shearing surface is located between the shaping start point and the shaping end point.

[0015] In a first aspect, in some embodiments, the shaping surface includes a shaping side wall adjacent to the loading surface, and a shaping bottom wall adjacent to the shaping side wall;

[0016] In the sliding direction of the oblique wedge shaping and trimming insert, the shearing surface protrudes from the shaping bottom wall, and the vertex of the shearing surface does not exceed the vertex of the shaping side wall.

[0017] In the first aspect, in some embodiments, in the sliding direction of the oblique wedge shaping and trimming insert, the apex of the shearing surface extends beyond the shaping bottom wall by 3 mm to 5 mm.

[0018] On the first aspect, in some embodiments, a finishing punch is embedded on the shaping movable punch and together with the shaping movable punch, the finishing punch forms the shaping trimming groove. One end of the finishing punch protrudes from the shaping movable punch to form the pressing surface and the shearing surface.

[0019] In the first aspect, in some embodiments, in the sliding direction of the oblique wedge shaping and trimming insert, a travel limiting surface for limiting the oblique wedge shaping and trimming insert is provided on the pressing block.

[0020] In the first aspect, in some embodiments, the pressing surface is a continuous curved surface, and in the sliding direction of the oblique wedge shaping and trimming insert, an end of the pressing surface close to the shaping and trimming groove does not exceed the loading surface.

[0021] In the first aspect, in some embodiments, the oblique wedge shaping and trimming insert is provided with a mounting groove for accommodating the pressing block, and a first elastic element for elastically pressing the pressing block is provided in the mounting groove.

[0022] In the first aspect, in some embodiments, the shaping movable punch is slidably connected to the lower die, and the upper die is provided with a first driving block for driving the shaping movable punch to move obliquely upward;

[0023] The upper die is provided with a second driving block for driving the oblique wedge shaping and trimming insert to move obliquely downward, and a second elastic element for elastically pressing the pressing plate.

[0024] In a second aspect, an embodiment of the present application provides a method for shaping and trimming a vehicle body side outer panel, using any of the above-described composite molds for shaping and trimming a vehicle body side outer panel, the method comprising:

[0025] S1. When the mold is open, the workpiece is placed, and the workpiece covers the loading surface of the shaping movable punch of the lower mold, and one end extends to the pressing surface of the shaping movable punch;

[0026] S2, the upper die moves to the lower die, the pressing plate and the pressing block on the upper die contact the workpiece and start pressing. The pressing plate presses one side of the workpiece against the loading surface, and the pressing block presses the other side of the workpiece against the pressing surface;

[0027] S3. After the pressing action is completed, the upper die continues to move towards the lower die, and the oblique wedge shaping and trimming insert on the upper die slides into the shaping and trimming groove of the shaping movable punch in the depth direction, and the extrusion surface on the oblique wedge shaping and trimming insert cooperates with the shaping surface on the shaping and trimming groove to start shaping the workpiece;

[0028] S4, the upper die continues to approach the lower die, the edge of the bevel trimming insert contacts the shear surface of the trimming groove, and the trimming work begins;

[0029] S5. After trimming is completed, the upper die continues to approach the lower die, and the extrusion surface on the oblique wedge trimming insert cooperates with the shaping surface on the trimming groove to continue shaping, so that the end of the workpiece flows into the shaping side. After the upper die and the lower die are completely closed, the shaping work is completed.

[0030] The beneficial effects of the technical solution provided by this application include:

[0031] The embodiment of the present application provides a composite mold and method for shaping and trimming a vehicle body side outer panel. The lower mold is provided with a shaping movable punch, which is provided with a loading surface and a pressing surface, and a shaping and trimming groove located between the loading surface and the pressing surface. The shaping and trimming groove has a shaping surface and a shearing surface.

[0032] The upper die is provided with a pressing plate for cooperating with the loading surface, a pressing block for cooperating with the pressing surface, and an inclined wedge shaping and trimming insert for sliding into the depth direction of the shaping and trimming groove. The inclined wedge shaping and trimming insert is provided with an extrusion surface for cooperating with the shaping and trimming groove, and a blade edge for cooperating with the shear surface.

[0033] Therefore, in the process of closing the upper and lower dies, the pressing plate and the loading surface can realize the inner pressing of the product part, and the pressing block and the pressing surface can realize the outer pressing of the waste part. When the sheet metal is pressed both inside and outside, the inclined wedge shaping and trimming insert slides in along the depth direction of the shaping and trimming groove, and the shaping action is performed through the cooperation of the extrusion surface and the shaping surface.

[0034] Before the shaping process is complete, fine trimming is performed using the blade edge and shear surface. The shaping process is completed after the upper and lower dies are fully closed. This allows the fine trimming and shaping processes to be combined into a single process for the front end of the side A-pillar structure. This reduces the number of steps compared to the existing second solution and simplifies the structure compared to the existing third solution. This solution utilizes a wedge-shaped trimming insert to simultaneously perform shaping and trimming, eliminating the need for separate trimming and shaping inserts, thus reducing mold manufacturing and production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] Figure 1 It is a structural diagram of the side A-pillar of the prior art;

[0037] Figure 2 for Figure 1 Schematic diagram of the cross section at AA;

[0038] Figure 3 This is a schematic diagram of the process of solution 1 of the prior art;

[0039] Figure 4 This is a schematic diagram of the process of solution 2 of the prior art;

[0040] Figure 5 This is a schematic diagram of the process of solution three of the prior art;

[0041] Figure 6 It is a structural diagram of a mold in the prior art;

[0042] Figure 7 This is a schematic structural diagram of a composite mold according to an embodiment of the present application;

[0043] Figure 8 This is a schematic diagram of the implementation of the composite mold of an embodiment of the present application;

[0044] Figure 9 This is a schematic structural diagram of a shaping and trimming groove according to an embodiment of the present application;

[0045] Figure 10 This is a schematic structural diagram of the oblique wedge shaping and trimming insert according to an embodiment of the present application.

[0046] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0047] 100, side A-pillar; 200, trimming insert; 300, shaping insert; 400, rigid clamping block; 500, shaping and trimming punch;

[0048] 1. Shaping movable punch; 11. Loading surface; 12. Pressing surface; 13. Shaping trimming groove; 131. Shaping surface; 1311. Shaping side wall; 1312. Shaping bottom wall; 132. Shearing surface; 2. Pressing plate; 3. Pressing block; 31. Travel limit surface; 4. Wedge shaping trimming insert; 41. Extrusion surface; 42. Blade edge; 43. Mounting groove; 5. First elastic element; 6. Finishing trimming punch; 7. First drive block; 8. Second drive block; 9. Second elastic element. DETAILED DESCRIPTION

[0049] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] In response to the shortcomings or one of the shortcomings of the above-mentioned background technology, an embodiment of the present application provides a composite mold and method for shaping and trimming the side outer panel of the vehicle body. For the front end structure of the side A-pillar, it can combine the fine trimming process content and the shaping process content into one process, reduce the process steps, and reduce the mold manufacturing cost and production cost.

[0051] See also Figures 7 to 10 As shown, the first aspect of the embodiment of the present application provides a composite mold for shaping and trimming a vehicle body side outer panel, comprising:

[0052] The lower die is provided with a shaping movable punch 1, the shaping movable punch 1 is provided with a loading surface 11 and a pressing surface 12, and a shaping trimming groove 13 located between the loading surface 11 and the pressing surface 12, the shaping trimming groove 13 has a shaping surface 131 and a shearing surface 132;

[0053] The upper mold is provided with a pressing plate 2 for cooperating with the loading surface 11, a pressing block 3 for cooperating with the pressing surface 12, and an inclined wedge shaping and trimming insert 4 for sliding into the depth direction of the shaping and trimming groove 13. The inclined wedge shaping and trimming insert 4 is provided with an extrusion surface 41 for cooperating with the shaping and trimming groove 13, and a blade edge 42 for cooperating with the shear surface 132.

[0054] The shaping movable punch 1 of the composite die for shaping and trimming the vehicle body side outer panel in the embodiment of the present application is provided with a loading surface 11 and a pressing surface 12, as well as a shaping and trimming groove 13 located between the loading surface 11 and the pressing surface 12. The shaping and trimming groove 13 has a shaping surface 131 and a shearing surface 132. The lower die is provided with a pressing plate 2, a pressing block 3, and an oblique wedge shaping and trimming insert 4. The oblique wedge shaping and trimming insert 4 has an extrusion surface 41 and a cutting edge 42.

[0055] During the closing process of the upper and lower dies, the pressing plate 2 and the loading surface 11 can realize the inner pressing of the product part, and the pressing block 3 and the pressing surface 12 can realize the outer pressing of the waste part. When the sheet material is pressed both inside and outside, the inclined wedge shaping and trimming insert 4 slides in the depth direction of the shaping and trimming groove 13, and the shaping action is performed through the cooperation of the extrusion surface 41 and the shaping surface 131.

[0056] Before the shaping process is complete, the blade edge 42 and shear surface 132 cooperate to perform fine trimming. Once the upper and lower molds are fully closed, the shaping process is complete. This allows the fine trimming and shaping processes for the front end of the side A-pillar 100 to be combined into a single process, reducing process steps and lowering mold manufacturing and production costs.

[0057] It should be noted that the process scheme of this application is as follows: in the first step, the negative angle area of ​​the product in the stamping direction is expanded and drawn; in the second step, this area is roughly trimmed to remove most of the supplementary features of the drawing; and in the third step, the outer elastic pressing material is wedge-shaped and then compositely trimmed to the product contour. This technical solution is mainly based on the invention and innovation of the third step.

[0058] In some optional embodiments, see Figures 7 to 10 As shown, an embodiment of the present application provides a composite mold for shaping and trimming the outer panel of the vehicle body side panel. In the sliding direction of the oblique wedge shaping and trimming insert 4, the shaping surface 131 has a shaping starting point and a shaping end point, and the shear surface 132 is located between the shaping starting point and the shaping end point.

[0059] The shearing surface 132 of the embodiment of the present application is located between the shaping starting point and the shaping end point, so that the product shaping process can utilize the shearing surface 132 to cooperate with the bevel shaping and trimming insert 4 for fine trimming. After the fine trimming is completed, the bevel shaping and trimming insert 4 continues to move toward the shaping end point, so that the end of the product close to the waste material after fine trimming can flow toward the shaping side and will not abut on the shearing surface 132, thereby effectively avoiding the problem of material jamming in the lower mold.

[0060] In some optional embodiments, see Figures 7 to 10As shown, the embodiment of the present application provides a composite mold for shaping and trimming a vehicle body side outer panel. The shaping surface 131 of the composite mold for shaping and trimming a vehicle body side outer panel includes a shaping side wall 1311 adjacent to the loading surface 11 and a shaping bottom wall 1312 adjacent to the shaping side wall 1311.

[0061] In the sliding direction of the oblique wedge shaping and trimming insert 4 , the shearing surface 132 protrudes from the shaping bottom wall 1312 , and the apex of the shearing surface 132 does not exceed the apex of the shaping side wall 1311 .

[0062] The shaping surface 131 of the embodiment of the present application includes a shaping side wall 1311 and a shaping bottom wall 1312. The shaping side wall 1311 and the shaping bottom wall 1312 cooperate to form the negative angle at the front end structure of the side A-pillar 100 of the vehicle body side outer panel product, that is, the shaping side wall 1311 cooperates with the oblique wedge shaping trimming insert 4 to form the first bending surface with a negative angle, and the shaping bottom wall 1312 cooperates with the oblique wedge shaping trimming insert 4 to form the second bending surface with a negative angle.

[0063] Among them, in the sliding direction of the oblique wedge shaping and trimming insert 4, the shear surface 132 protrudes from the shaping bottom wall 1312, and the apex of the shear surface 132 does not exceed the apex of the shaping side wall 1311, so that before the second bending surface is extruded and formed, the shear surface 132 cooperates with the blade 42 on the oblique wedge shaping and trimming insert 4 to fine-trim the second bending surface to cut off waste. After the fine-trim is completed, the oblique wedge shaping and trimming insert 4 can continue to approach the shaping bottom wall 1312 to form the second bending surface.

[0064] Because the second bent surface is finely trimmed before complete forming, the end of the second bent surface closest to the waste material can flow slightly toward the shaping side under the pressure of the oblique wedge shaping and trimming insert 4, without abutting against the shear surface 132, thereby effectively preventing the problem of material jamming in the lower die. In addition, in this embodiment, the shear surface 132 is arranged close to the shaping bottom wall 1312, allowing fine trimming to be performed near the end of the shaping process, thereby ensuring the molding quality of the component.

[0065] In some optional embodiments, see Figures 7 to 10 As shown, an embodiment of the present application provides a composite mold for shaping and trimming the outer panel of the vehicle body side panel. In the sliding direction of the oblique wedge shaping and trimming insert 4, the vertex of the shear surface 132 of the composite mold for shaping and trimming the outer panel of the vehicle body side panel exceeds the plane where the shaping bottom wall 1312 is located by 3mm to 5mm.

[0066] The apex of the shearing surface 132 in the embodiment of the present application extends 3mm to 5mm beyond the plane of the shaping bottom wall 1312 in the sliding direction of the oblique wedge shaping and trimming insert 4, leaving space for the blade of the oblique wedge shaping and trimming insert 4 to perform fine trimming work. At the same time, it can also achieve a flow rate of 3mm to 5mm in the product contour from the beginning of fine trimming to the end of fine trimming and shaping, that is, the product contour will not abut the shearing surface 132, effectively avoiding the problem of material jamming in the lower mold.

[0067] In some optional embodiments, see Figures 7 to 10 As shown, an embodiment of the present application provides a composite mold for shaping and trimming the outer panel of the vehicle body side panel, wherein a finishing punch 6 is embedded on the shaping movable punch 1 of the composite mold for shaping and trimming the outer panel of the vehicle body side panel, and together with the shaping movable punch 1, a shaping and trimming groove 13 is formed. The finishing punch 6 protrudes from one end of the shaping movable punch 1 to form a pressing surface 12 and a shearing surface 132.

[0068] In the embodiment of the present application, a trimming punch 6 is embedded and fixed on the shaping movable punch 1. The trimming punch 6 and the shaping movable punch 1 together form a shaping trimming groove 13. The trimming punch 6 protrudes from one end of the shaping movable punch 1 to form a binder surface 12 and a shearing surface 132. Compared with directly machining the binder surface 12 and the shearing surface 132 on the shaping movable punch 1, the machining difficulty can be reduced and the manufacturing accuracy of the binder surface 12 and the shearing surface 132 can be improved.

[0069] In some optional embodiments, see Figures 7 to 10 As shown, an embodiment of the present application provides a composite mold for shaping and trimming the outer panel of the vehicle body side panel. In the sliding direction of the oblique wedge shaping and trimming insert 4, a stroke limiting surface 31 for limiting the oblique wedge shaping and trimming insert 4 is provided on the pressing block 3.

[0070] The pressing block 3 of the embodiment of the present application is provided with a stroke limit surface 31, which can limit the end point of the inclined wedge shaping and trimming insert 4 sliding into the shaping and trimming groove 13, thereby preventing the inclined wedge shaping and trimming insert 4 from being too close to the shaping bottom wall 1312 and causing excessive pressure on the product.

[0071] In some optional embodiments, see Figures 7 to 10 As shown, an embodiment of the present application provides a composite mold for shaping and trimming the outer panel of the vehicle body side, wherein the pressing surface 12 of the composite mold for shaping and trimming the outer panel of the vehicle body side is a continuous curved surface, and in the sliding direction of the oblique wedge shaping and trimming insert 4, the end of the pressing surface 12 close to the shaping and trimming groove 13 does not exceed the loading surface 11.

[0072] The binder surface 12 of the present embodiment is a continuous curved surface. The curved surface, in conjunction with the binder block 3, ensures a good binder effect and the quality of the product. Furthermore, in the direction in which the oblique wedge shaping and trimming insert 4 slides in, the end of the curved surface proximal to the shaping and trimming groove 13 does not extend beyond the loading surface 11. This means that in the direction in which the oblique wedge shaping and trimming insert 4 slides in, the apex of the shear surface 132 does not extend beyond the apex of the shaping surface 131.

[0073] The shear surface 132 is located between the shaping starting point and the shaping end point. During the product shaping process, the shear surface 132 can be used in conjunction with the bevel shaping and trimming insert 4 to perform fine trimming. After the fine trimming is completed, the bevel shaping and trimming insert 4 continues to move toward the shaping end point, so that the end of the product close to the waste material after fine trimming can flow toward the shaping side and will not abut against the shear surface 132, thereby effectively avoiding the problem of material jamming in the lower mold.

[0074] In some optional embodiments, see Figures 7 to 10 As shown, an embodiment of the present application provides a composite mold for shaping and trimming the outer panel of the vehicle body side, wherein the oblique wedge shaping and trimming insert 4 of the composite mold for shaping and trimming the outer panel of the vehicle body side is provided with a mounting groove 43 for accommodating the pressing block 3, and a first elastic element 5 for elastically pressing the pressing block 3 is provided in the mounting groove 43.

[0075] In the embodiment of the present application, the oblique wedge shaping and trimming insert 4 is provided with a mounting groove 43, and the press block 3 is slidably mounted in the mounting groove 43. A first elastic element 5 is also mounted in the mounting groove 43. The first elastic element 5 provides a pressure source for the press block 3. Therefore, before the oblique wedge shaping and trimming insert 4 slides into the shaping and trimming groove 13, the press block 3 can press the product plate against the press surface 12 under the elastic pressure of the first elastic element 5. For example, the first elastic element 5 can be a nitrogen cylinder.

[0076] In some optional embodiments, see Figures 7 to 10 As shown, the embodiment of the present application provides a composite mold for shaping and trimming the outer panel of the vehicle body side. The composite mold for shaping and trimming the outer panel of the vehicle body side has a shaping movable punch 1 that is slidably connected to a lower mold, and a first driving block 7 for driving the shaping movable punch 1 to move obliquely upward is provided on the upper mold.

[0077] The upper die is provided with a second driving block 8 for driving the oblique wedge shaping and trimming insert 4 to move obliquely downward, and a second elastic element 9 for elastically pressing the pressing plate 2.

[0078] In the embodiment of the present application, the upper and lower molds are clamped together vertically. Aiming at the front end structure of the side A-pillar 100 of the product, the lower mold is provided with a slideway for the shaping movable punch 1 to slide obliquely upward, and the upper mold is provided with a slideway for the oblique wedge shaping trimming insert 4 to slide obliquely downward. The shaping movable punch 1 is driven by the first driving block 7 on the upper mold, and the oblique wedge shaping trimming insert 4 is driven by the second driving block 8 on the upper mold. During the clamping process of the upper and lower molds, the pressing block 3 carried by the oblique wedge shaping trimming insert 4 and the shaping movable punch 1 can achieve stable pressing of the product sheet.

[0079] In addition, the second elastic element 9 provided on the upper die provides a pressure source for the blank holder 2. Before the wedge shaping and trimming insert 4 slides into the shaping and trimming groove 13, the blank holder 2 can press the product sheet against the shaping movable punch 1 under the elastic pressure of the second elastic element 9. For example, the first elastic element 5 can be a nitrogen cylinder.

[0080] See also Figures 7 to 10 As shown, a second aspect of the embodiment of the present application provides a method for shaping and trimming a vehicle body side outer panel, using the vehicle body side outer panel shaping and trimming composite mold of any of the above embodiments, the method comprising:

[0081] S1. When the mold is open, the workpiece is placed, and the workpiece covers the loading surface 11 of the shaping movable punch 1 of the lower mold, and one end extends to the pressing surface 12 of the shaping movable punch 1;

[0082] S2, the upper die moves toward the lower die, and the pressing plate 2 and the pressing block 3 on the upper die contact the workpiece and start pressing. The pressing plate 2 presses one side of the workpiece onto the loading surface 11, and the pressing block 3 presses the other side of the workpiece onto the pressing surface 12;

[0083] S3. After the pressing action is completed, the upper die continues to move toward the lower die, and the oblique wedge shaping and trimming insert 4 on the upper die slides into the shaping and trimming groove 13 of the shaping movable punch 1 in the depth direction. The extrusion surface 41 on the oblique wedge shaping and trimming insert 4 cooperates with the shaping surface 131 on the shaping and trimming groove 13 to start shaping the workpiece;

[0084] S4, the upper die continues to approach the lower die, the edge 42 on the oblique wedge shaping and trimming insert 4 contacts the shear surface 132 on the shaping and trimming groove 13, and the trimming work begins;

[0085] S5. After trimming is completed, the upper die continues to approach the lower die, and the extrusion surface 41 on the oblique wedge trimming insert 4 cooperates with the shaping surface 131 on the shaping trimming groove 13 to continue shaping, so that the end of the workpiece flows into the shaping side. After the upper die and the lower die are completely closed, the shaping work is completed.

[0086] The embodiment of the present application mainly introduces a three-step side A-pillar 100 end forming process structure, which realizes the completion of the oblique wedge shaping and finishing content with the outer elastic pressing structure in the shaping sequence. This solution is implemented by three process steps.

[0087] Specifically, the first step involves expanding the negative angle area of ​​the product in the stamping direction and drawing it into shape. The second step involves rough trimming this area, removing most of the draw-in features. In the third step, the upper die incorporates a conventional pressing structure in the product area, but designs an elastic pressing structure and a wedge-shaped trimming insert 4 in the area of ​​the draw-in features left over from the rough trimming in the second step. The lower die also incorporates a trimming groove 13 in the shaping active punch 1 of the lower die. The process uses the wedge-shaped trimming insert 4 to shape the negative angle expansion features in this area into the product's shape, while also fine-tuning the remaining material in this area to the final product contour.

[0088] This technical solution is mainly an invention and innovation of the third process. In the shaping process, an outer elastic pressing structure can be used to avoid unfavorable adjustment of the outer rigid clamping structure during shaping. The contents of the fine trimming process and the shaping process are combined into one process. Compared with the second solution of the prior art, one process is reduced, thereby reducing the mold manufacturing cost and production cost.

[0089] The working process of this application mold:

[0090] As the upper die moves downward under the action of the press slide, the shaping movable punch 18 of the lower die moves obliquely upward to the final product state position under the action of the first driving block 7 of the upper die.

[0091] Subsequently, the pressing plate 2 of the upper die moves downward with the upper die under the action of the second elastic element 9, contacts the workpiece, and starts the pressing action.

[0092] After the pressing plate 2 completes a certain pressing action, the oblique wedge shaping and trimming insert 4 of the upper mold moves obliquely downward under the action of the second driving block 8, wherein the pressing block 3 slides with the oblique wedge shaping and trimming insert 4 under the drive of the first elastic element 5, and after contacting the workpiece, it starts the outer side pressing action together with the shaping movable punch 1 and the upper fine trimming punch 6 of the lower mold.

[0093] The upper die continues to descend, and the shaping working part of the oblique wedge shaping and trimming insert 4 of the upper die contacts the workpiece, and together with the shaping movable punch 1 of the lower die, the shaping action begins. Before the shaping reaches the bottom, the edge 42 of the fine trimming working part of the oblique wedge shaping and trimming insert 4 of the upper die contacts the shear surface 132 on the fine trimming punch 6 of the lower die, and the trimming work begins. After the upper die runs to the bottom, the shaping and trimming work is completed.

[0094] The shaping and trimming method of the vehicle body side outer panel of the present application has the following advantages:

[0095] 1. When the oblique wedge shaping and trimming insert 4 contacts the shaping movable punch 1 and starts shaping, the pressing plate 2 and the shaping movable punch 1 have already realized the inner pressing of the product part, and the pressing plate 2 and the finishing punch 6 have realized the outer pressing of the waste part. When the sheet metal is pressed both inside and outside, the shaping action can be completed well to ensure the quality of the parts.

[0096] 2. 3mm to 5mm before the end of the shaping process, from the beginning to the end of the trimming process, the pressing plate 2 and the trimming punch 6 press the outside of the waste part, and the pressing plate 2 and the shaping movable punch 1 press the inside of the product part to ensure the quality of the trimming process.

[0097] 3. The working part of the trimming punch 6 of the lower die is 3mm to 5mm higher than the shaping movable punch 1 in the working direction of the oblique wedge shaping trimming insert 4, leaving space for the trimming blade of the oblique wedge shaping trimming insert 4 to enter. At the same time, it can also achieve an inflow of 3mm to 5mm in the product contour from the beginning of trimming to the end of trimming and shaping, effectively avoiding the problem of material jamming in the lower die.

[0098] 4. The trimming edge of the upper die's oblique wedge shaping and trimming insert 4 is arranged on the product side, and the trimming punch 6 of the lower die is arranged on the waste side. Contrary to the traditional arrangement structure, while realizing the elastic pressing function on the waste side, it also avoids the problem of the oblique wedge shaping and trimming insert 4 carrying material after trimming, and effectively avoids the problem of the upper die returning with material after the stamping is completed.

[0099] 5. This application combines the finishing process into the shaping process with outer pressing, which reduces the number of processes and reduces costs.

[0100] In the description of this application, it should be noted that the terms "upper" and "lower" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0101] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0102] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A composite die for shaping and trimming the side outer panel of a vehicle body, characterized in that: include: A lower die is provided with a shaping movable punch (1), the shaping movable punch (1) is provided with a material loading surface (11) and a material pressing surface (12), and a shaping trimming groove (13) located between the material loading surface (11) and the material pressing surface (12), the shaping trimming groove (13) having a shaping surface (131) and a shearing surface (132); an upper die, on which a pressing plate (2) for cooperating with the material loading surface (11), a pressing block (3) for cooperating with the material pressing surface (12), and an inclined wedge shaping and trimming insert (4) for sliding into the shaping and trimming groove (13) in a depth direction, the inclined wedge shaping and trimming insert (4) being provided with an extrusion surface (41) for cooperating with the shaping and trimming groove (13), and a blade edge (42) for cooperating with the shearing surface (132); In the sliding direction of the oblique wedge shaping trimming insert (4), the shaping surface (131) has a shaping start point and a shaping end point, and the shearing surface (132) is located between the shaping start point and the shaping end point; A finishing punch (6) is embedded in the shaping movable punch (1) and forms the shaping trimming groove (13) together with the shaping movable punch (1); one end of the finishing punch (6) protrudes from the shaping movable punch (1) to form the pressing surface (12) and the shearing surface (132); The oblique wedge shaping and trimming insert (4) is provided with a mounting groove (43) for accommodating the pressing block (3), and a first elastic element (5) for elastically pressing the pressing block (3) is provided in the mounting groove (43).

2. The composite mold for shaping and trimming the vehicle body side outer panel according to claim 1, characterized in that: The shaping surface (131) includes a shaping side wall (1311) adjacent to the loading surface (11), and a shaping bottom wall (1312) adjacent to the shaping side wall (1311); In the sliding direction of the oblique wedge shaping and trimming insert (4), the shearing surface (132) protrudes from the shaping bottom wall (1312), and the apex of the shearing surface (132) does not exceed the apex of the shaping side wall (1311).

3. The composite die for shaping and trimming the vehicle body side outer panel according to claim 2, characterized in that: In the sliding direction of the oblique wedge shaping and trimming insert (4), the apex of the shearing surface (132) extends beyond the shaping bottom wall (1312) by 3 mm to 5 mm.

4. The composite die for shaping and trimming the vehicle body side outer panel according to claim 1, characterized in that: In the sliding direction of the oblique wedge shaping and trimming insert (4), a travel limiting surface (31) for limiting the oblique wedge shaping and trimming insert (4) is provided on the pressing block (3).

5. The composite die for shaping and trimming the vehicle body side outer panel according to claim 1, characterized in that: The pressing surface (12) is a continuous curved surface. In the sliding direction of the oblique wedge shaping and trimming insert (4), the end of the pressing surface (12) close to the shaping and trimming groove (13) does not exceed the loading surface (11).

6. The composite mold for shaping and trimming the vehicle body side outer panel according to claim 1, characterized in that: The shaping movable punch (1) is slidably connected to the lower die, and the upper die is provided with a first driving block (7) for driving the shaping movable punch (1) to move obliquely upward; The upper die is provided with a second driving block (8) for driving the oblique wedge shaping and trimming insert (4) to move obliquely downward, and a second elastic element (9) for elastically pressing the pressing plate (2).

7. A method for shaping and trimming a vehicle body side outer panel, using the vehicle body side outer panel shaping and trimming composite mold according to any one of claims 1 to 6, characterized in that: The method comprises: When the mold is open, the workpiece is placed, and the workpiece covers the loading surface (11) of the shaping movable punch (1) of the lower mold, and one end extends to the pressing surface (12) of the shaping movable punch (1); The upper die moves toward the lower die, and the pressing plate (2) and the pressing block (3) on the upper die contact the workpiece and start pressing. The pressing plate (2) presses one side of the workpiece onto the loading surface (11), and the pressing block (3) presses the other side of the workpiece onto the pressing surface (12); After the pressing action is completed, the upper die continues to move toward the lower die, and the oblique wedge shaping and trimming insert (4) on the upper die slides into the shaping and trimming groove (13) of the shaping movable punch (1) in the depth direction, and the extrusion surface (41) on the oblique wedge shaping and trimming insert (4) cooperates with the shaping surface (131) on the shaping and trimming groove (13) to start shaping the workpiece; The upper die continues to approach the lower die, and the edge (42) on the oblique wedge shaping and trimming insert (4) contacts the shear surface (132) on the shaping and trimming groove (13), and the trimming work begins; After the trimming is completed, the upper die continues to approach the lower die, and the extrusion surface (41) on the oblique wedge trimming insert (4) cooperates with the shaping surface (131) on the shaping trimming groove (13) to continue shaping, so that the end of the workpiece flows into the shaping side. After the upper die and the lower die are completely closed, the shaping work is completed.

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