Die for press flanging and press flanged part

Abstract

The application relates to a die for stamping a flanged part and a stamping part thereof. The stamping die comprises an upper die body, a material pressing assembly arranged in the upper die body, a lower die body arranged opposite to the upper die body, a male die assembly arranged in the lower die body, at least a part of the male die assembly being used for cooperating with the material pressing assembly, a flanging assembly slidingly connected to the lower die body and used for cooperating with the male die assembly, and a local sill body adjustably embedded at the male die assembly or adjustably embedded at the flanging assembly, the local sill body being used for clamping a process surface of a preformed piece of the flanged part. The stamping die can avoid wrinkles, defects and the like of the flanged part.

Description

Technical Field

[0001] This application relates to the field of automotive structural component manufacturing mold technology, and in particular to molds for stamping flanged parts and their stamped parts. Background Technology

[0002] Automotive structural components are often manufactured using stamping dies. Intense competition in the automotive market and constantly evolving requirements for automotive structural design are driving the trend towards more complex and personalized vehicle styling. This trend directly impacts the design and manufacturing of stamping dies, significantly increasing the difficulty of die design.

[0003] Automotive side panel covers have a complex structure, with the upper sill section featuring multiple surfaces running from the inside out, primarily including the A-side, the welded surface, and complex curved surfaces. The A-side needs to meet dimensional requirements, while the welded surface is used to weld to the roof. The stamping dies require high precision and complexity. The die's profile design must precisely match the complex curved surfaces, which not only increases the difficulty of die manufacturing but also places higher demands on die materials and processing techniques. Furthermore, the complex shape leads to more complex material flow during stamping, making it prone to wrinkling, A-side defects, and other issues that affect product quality.

[0004] Furthermore, unstable weld surface quality, such as issues with surface flatness or dimensional accuracy, can pose challenges during laser welding. Laser welding demands extremely high precision and surface quality from the weld surfaces; defective weld surfaces can lead to uneven energy distribution, resulting in incomplete welds, weld detachment, and other welding quality problems that negatively impact the overall performance and safety of the vehicle. Utility Model Content

[0005] Therefore, it is necessary to provide a die for stamping flanged parts and the stamped parts thereof to address at least one of the above problems.

[0006] In a first aspect, this application provides a die for stamping flanged parts, the die comprising: an upper die body; a blanking assembly disposed on the upper die body; a lower die body disposed opposite to the upper die body; a punch assembly disposed on the lower die body, at least a portion of the punch assembly being used to cooperate with the blanking assembly; a flanging assembly slidably connected to the lower die body for cooperating with the punch assembly; and a partial retainer adjustablely fitted at the punch assembly or adjustablely fitted at the flanging assembly, the partial retainer being used to clamp the process surface of the preform sheet of the flanged part.

[0007] By setting adjustable local thresholds, the clamping force of the die on the process surface during stamping can be adjusted, thereby controlling the material flow state in the flanged part of the preform. Especially for complex-shaped flanged parts, the local thresholds can be positioned specifically to help reduce or even avoid wrinkles and defects in the flanged parts. Dies used for stamping flanged parts can produce high-quality stamped parts. In addition, by adjusting the local thresholds, manufacturing deviations or wear can be absorbed, which is beneficial for trial production, production, adjustment, and maintenance.

[0008] In some embodiments, the partial sill has a model line extending in a direction away from the pressure assembly. The model line includes an arcuate segment that protrudes in the opposite direction to the flange direction, a first extension segment connected to the arcuate segment, and a second extension segment that deflects toward the protruding side of the arcuate segment relative to the first extension segment.

[0009] This design allows for both stretching of the process surface and smooth, stable material flow using the curved section.

[0010] In some implementations, the radius of the arc segment ranges from 9 mm to 12 mm.

[0011] This setup facilitates adjustment and ensures smooth and stable material flow.

[0012] For example, the angle between the second extension and the first extension ranges from 99° to 100°.

[0013] This setup allows for easy adjustment and enables the clamping of the process surface as needed.

[0014] For example, the length of the second extension is 23mm to 25mm.

[0015] This design ensures sufficient processability and avoids wasting materials.

[0016] For example, the height of the model line along the stamping direction is 47mm to 49mm.

[0017] This design provides sufficient strength and workability to ensure adjustment and effectively control the state of the flanged parts.

[0018] In some embodiments, the partial sill is an adjustable lower sill connected to the lower die body, which fits into the punch assembly for engagement with the flanging assembly.

[0019] With this design, the local sill can be stably fixed to the lower mold body, and the structure of the flange assembly is simple and reliable.

[0020] In some embodiments, the flanging assembly includes a flanging structure and a side-pressing structure; along the direction away from the pressing assembly, the flanging portion of the flanging structure and the upper sill portion of the side-pressing structure are arranged sequentially; the side-pressing structure is adjustablely connected to the flanging structure to control the distance between the upper sill portion and the lower sill portion.

[0021] This setup allows for control of material flow, ensuring both the flanging effect and the clamping effect on the process surface.

[0022] In some embodiments, the flanging assembly further includes a balance adjustment block disposed on the side pressure structure and located on the side of the upper sill facing away from the flanging portion. The balance adjustment block is used to abut against the punch assembly during mold closing to control the distance between the upper sill and the lower sill.

[0023] This configuration allows for direct and reliable control of the relative positions of the upper sill and the punch assembly, thereby ensuring the relative positions of the upper sill and the lower sill.

[0024] In some embodiments, the pressure assembly includes a positive pressure plate disposed on the upper die body and a side pressure plate disposed on the positive pressure plate; the punch assembly includes a fixed punch, a split movable punch, and a normal floating punch, the fixed punch is disposed on the lower die body, the split movable punch is disposed between the fixed punch and the lower die body, and the normal floating punch is disposed on the split movable punch; the design distance between the normal floating punch and the positive pressure plate has an overpressure of 0.2 mm to 0.25 mm relative to the thickness of the corresponding position of the flange.

[0025] With this configuration, the punch assembly can be well used for stamping parts with complex shapes. It also prevents excessive material flow on the A side of the flanged part, such as the side panel cover, by pressing the flanged part, thus achieving a high-quality flanged effect.

[0026] In some embodiments, the upper die body includes a first driving block and a second driving block, and the flanging assembly includes a flanging wedge. The first driving block and the flanging wedge are slidably matched to drive the flanging assembly to slide relative to the lower die body. The die also includes a trolley, a balance block, and a balance cylinder. The trolley includes a guide block, a side guide plate, and a trapezoidal guide plate. The second driving block and the guide block are slidably matched to drive the trolley to slide relative to the lower die body. The side guide plate and the split movable punch are slidably matched to drive the split movable punch to slide relative to the lower die body. The trapezoidal guide plate and the normal floating punch are slidably matched to drive the normal floating punch to slide relative to the split movable punch. The balance block is disposed on the side pressure plate, and the balance cylinder is disposed on the flanging assembly. The balance cylinder can abut against the balance block.

[0027] With this setup, the upper mold body controls the movement of each component in the lower mold, making mold control easy; the balance block and balance cylinder work together to balance the force exerted by the side pressure plate on the split movable punch, resulting in good mold stamping performance.

[0028] In some embodiments, the lower die body and the upper die body are arranged opposite each other along the stamping direction, and the flanging assembly and the punch assembly are arranged opposite each other along the flanging direction; one of the upper die body and the lower die body includes a convex leg and the other includes a concave groove, and the convex leg and the concave groove are inserted into each other along the stamping direction; the mold also includes a side guide plate, which is arranged between the convex leg and the concave groove along the flanging direction.

[0029] This design is intended to eliminate lateral forces generated during the stamping process and balance the mold.

[0030] Secondly, this application provides a stamped part obtained according to the aforementioned mold for stamping flanged parts.

[0031] The stamped parts of the embodiments of this application have good morphological quality; surface A is flat; the welded surface has good quality; and the complex surface is qualified. Attached Figure Description

[0032] Figure 1 A schematic exploded view of a die for stamping flanged parts according to one or more embodiments;

[0033] Figure 2 A schematic cross-sectional view of a die for stamping flanged parts according to one or more embodiments at a partial sill.

[0034] Figure 3 A schematic structural diagram of a preform sheet according to one or more embodiments;

[0035] Figure 4 This is a schematic diagram of the side panel covering for comparison.

[0036] Figure 5 A schematic diagram of the model lines of a die for stamping flanged parts according to one or more embodiments;

[0037] Figure 6 This is a schematic diagram of the upper mold according to one or more embodiments;

[0038] Figure 7 A schematic isometric view of the upper mold according to one or more embodiments;

[0039] Figure 8 This is a schematic diagram of the lower mold according to one or more embodiments;

[0040] Figure 9 A schematic isometric view of the lower mold according to one or more embodiments;

[0041] Figure 10 This is a front view schematic diagram of a die for stamping flanged parts according to one or more embodiments;

[0042] Figure 11for Figure 10 A schematic partial sectional view at section AA in the middle;

[0043] Figure 12 for Figure 10 A schematic partial sectional view at section BB;

[0044] Figure 13 This is a schematic diagram of the side pressure structure and the partial sill body according to one or more embodiments.

[0045] Explanation of reference numerals in the attached drawings: 100, upper die; 110, upper die body; 111, first drive block; 112, second drive block; 113, convex leg; 114, anti-side guide plate; 120, pressure assembly; 200, lower die; 210, lower die body; 211, concave groove; 220, punch assembly; 230, flanging assembly; 231, balance adjustment block; 240, trolley; 241, guide block; 242, side guide plate; 243, trapezoidal guide plate;

[0046] 1. Positive pressure plate; 2. Side pressure plate; 201. Balance block; 202. Balance cylinder; 3. Fixed punch; 4. Split movable punch; 5. Normal floating punch; 6. Flanging structure; 601. Flanging wedge; 602. Flanging part; 7. Side pressure structure; 701. Upper sill part; 8. Partial sill body;

[0047] 1000, Die for stamping flanged parts; 2000, Precast sheet; 2100, Precast flanged part; 2200, Process surface; 3100, A surface; 3200, Welding surface; 3300, Curved surface. Detailed Implementation

[0048] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0049] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0050] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. For example, a first driving block may also be referred to as a second driving block, and a second driving block may also be referred to as a first driving block. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "connected," "linked," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; a flexible connection or a rigid connection along at least one direction; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium, or a direct connection with an intermediate medium present; and they can also refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. The terms "installed," "set," "fixed," etc., can be broadly understood as connection. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0053] As used in this application, the terms "layer" and "region" refer to a material portion comprising a defined area and having a defined thickness. A layer can extend horizontally, vertically, and / or along a conical surface. A layer can be a region of uniform or non-uniform continuous structure, and its thickness perpendicular to the direction of extension may not exceed the thickness of the continuous structure. A layer can comprise multiple layers, which can be stacked layers or discretely extending layers. The shapes of the various regions and layers in the accompanying drawings, as well as their relative sizes and positional relationships, are merely illustrative and may deviate from actual dimensions due to manufacturing tolerances or technical limitations, and the design can be adjusted according to actual needs.

[0054] refer to Figure 1 , Figure 1 A die for stamping flanged parts according to an embodiment of this application is shown. This die can be used to process side panel covers for automobiles. Exemplarily, the left and right side panels can be symmetrically arranged.

[0055] For ease of description, a spatial rectangular coordinate system XYZ is established. This spatial rectangular coordinate system XYZ can be roughly established based on the side panel covering. For the use of the mold, the Y-axis direction can be referred to as the up-down direction, and the XZ plane can be referred to as the horizontal plane.

[0056] The die 1000 for stamping flanged parts includes an upper die 100 and a lower die 200. The upper die 100 can be positioned above the lower die 200 along the Y-axis direction, and the two can move relative to each other along the Y-axis direction under the control of the stamping machine. The stamping direction can be parallel to the Y-axis direction.

[0057] In an exemplary embodiment, the mold 1000 for stamping and flanging parts includes an upper mold body 110, a blanking assembly 120, a lower mold body 210, a punch assembly 220, and a flanging assembly 230.

[0058] The pressing assembly 120 is disposed on the upper mold body 110, and the two can be used to form the upper mold 100.

[0059] A lower die body 210, a punch assembly 220, and a flanging assembly 230 can be used to construct a lower die 200. The lower die body 210 and the upper die body 110 are arranged opposite each other along the stamping direction. The punch assembly 220 is disposed on the lower die body 210, and at least a portion of the punch assembly 220 is used to cooperate with the blank holder assembly 120. The flanging assembly 230 is slidably connected to the lower die body 210. The flanging assembly 230 can move approximately along the Z-axis direction relative to the lower die body 210, but the actual sliding direction can be deflected relative to the Z-axis direction. The flanging assembly 230 is used to cooperate with the punch assembly 220.

[0060] refer to Figure 2The die 1000 for stamping flanged parts also includes at least one partial sill 8. Exemplarily, the partial sill 8 is a partial lower sill. The partial sill 8 is connected to the lower die body 210, and the partial sill 8 is adjustable, for example, by means of at least one first shim disposed on the lower die body 210. The partial sill 8 is adjustable relative to the lower die body 210 along the Z-axis. The partial sill 8 can be stably fixed to the lower die body 210 and withstand pressure.

[0061] A partial lower sill is fitted into the punch assembly 220. In the blanking surface of the punch assembly 220, a section of the partial sill 8 extends approximately along the X-axis direction, and this section is connected and completed through the blanking surface of the partial sill 8. The partial sill 8 and the punch assembly 220 together cooperate with the flanging assembly 230.

[0062] The partial sill 8 may have an L-shaped structure, with the top of the side arm serving as a blank holder, the bottom arm providing support, and bolt holes provided. The punch assembly 220 is provided with a corresponding adjustment groove, which can extend along the Y-axis direction.

[0063] refer to Figure 3 The precast sheet 2000 after stamping may include a process surface 2200 and a flange. The structure of each step of the processing can be referred to as the precast structure of the subsequent step. The process surface 2200 may be cut off. The flange may be a side panel cover, with the window as the inner side, and may include an A-side 3100, a welding surface 3200, and a curved surface 3300 arranged sequentially from the inside to the outside.

[0064] refer to Figure 4 Some proportionally manufactured flanged parts have poor surface quality, with noticeable wrinkles. The welding surface 3200 is prone to instability and wrinkling during the process. This wrinkling causes the welding surface 3200 to fail to meet the surface contour requirement of 0.3 / 150mm, resulting in poor adhesion of the welding surface 3200 during laser welding, making it difficult to distribute energy evenly, thus affecting welding quality and leading to problems such as incomplete welds and weld failure. Insufficient surface flatness and dimensional accuracy pose significant challenges to laser welding, affecting the quality of the welded surface, reducing welding strength, and ultimately adversely affecting the overall performance and safety of the vehicle. On the other hand, the complex shape of the flanged parts leads to complex material flow during stamping. Two-way flow easily results in defects on the A-side 3100 of the upper crossbeam of the stamped single part, with wrinkles and defects occurring alternately. As the visible surface of the vehicle's exterior, defects on the A-side 3100 not only affect the product's appearance quality but also adversely affect subsequent related processes.

[0065] refer to Figure 5In the prefabricated sheet 2000, the prefabricated flange 2100 and the process surface 2200 are connected, and the subsequent cutting position can be exemplary at the trimming contour h. In the die 1000 for stamping the flange, the pressing assembly 120 can be used with the punch assembly 220 to stamp parts such as the A surface 3100, and the flange assembly 230 can be used with the punch assembly 220 to stamp parts such as the welding surface 3200, the curved surface 3300, and the process surface 2200. The partial sill 8 is used to hold the process surface 2200 included in the prefabricated sheet 2000 of the flange.

[0066] During the stamping process, the portion of the prefabricated flanged part 2100 corresponding to surface A 3100 is clamped, and then the welded surface 3200 and curved surface 3300 are flanged and pressed, allowing the material to flow from the outside to the inside. By setting an adjustable local threshold 8, the clamping force on the process surface 2200 during stamping can be adjusted, thereby controlling the flow state of the material at the flanged part in the prefabricated sheet 2000.

[0067] For complex-shaped flanged parts, the local threshold 8 can be positioned specifically along the Z-axis, which helps to reduce or even avoid wrinkles and defects in the flanged parts. The die 1000 used for stamping flanged parts can produce high-quality stamped parts.

[0068] Combination Figure 5 As shown, the flange angle θ at the outer edge of surface A 3100 can be 75.2°. The flange assembly 230... Figure 5 The middle part is squeezed from left to right along the Z-axis. Figure 5 The direction to the right can be referred to as the flanging direction. The local sill 8 has a model line extending in a direction away from the pressure assembly 120, which includes an arc segment, a first extension segment, and a second extension segment. The arc segment bulges in the opposite direction to the flanging direction, i.e., it bulges to the left. The first extension segment connects to the arc segment. The second extension segment connects to the first extension segment, and the second extension segment is deflected relative to the first extension segment, deflecting towards the bulging side of the arc segment. The flanging assembly 230 conforms to the punch assembly 220, conforming to the local sill 8 at the local sill 8.

[0069] The bottom end of the second extension can be the bottom end of the blank holder surface of the local sill 8, and also the bottom end of the punch assembly 220 at that location. The deflection between the first and second extensions helps to clamp the process surface 2200. The arc-shaped segment can be smoothly connected to the first extension, and the inner end of the arc-shaped segment can be connected with a rounded transition. The arc-shaped segment can both ensure support for the process surface and facilitate the smooth and stable flow of material from the outside to the inside.

[0070] The height H of the model line of the local sill 8 along the stamping direction can be 47mm to 49mm, for example, 48mm. The pressure surface of the local sill 8 has sufficient area to ensure the clamping effect and can be adjusted in position to adjust the clamping force of the process surface 2200.

[0071] The pressure assembly 120 applies pressure to the punch assembly 220 along the stamping direction. The force acting on the preform 2000 can be equivalent to F1, and the force applied to the material between the local sill 8 and the flanging assembly 230 can be equivalent to F2. When F1 is small and F2 is large, the material at surface A 3100 becomes unstable and shifts, resulting in a depression at surface A 3100, but wrinkles do not occur. When F1 is large and F2 is small, the material at the process surface 2200 becomes unstable and flows too fast, causing wrinkles at the welding surface 3200, but no depression occurs at surface A 3100. If the stress state is different at different positions along the X-axis, wrinkling and depressions will occur alternately. By setting a local threshold 8 and adjusting its distance from the flange assembly 230, the force on the preform 2000 during the stamping process can be controlled, which helps to balance the force on the inner boundary and the force on the outer boundary, making F1 and F2 equal, ensuring the process stability of the inner boundary material and the outer boundary material under controlled conditions, thereby avoiding wrinkling and dents.

[0072] The die 1000 for stamping flanged parts can, by setting local thresholds 8, specifically adjust the flowability and stability of the material at the first extension section, effectively controlling the state of the flanged part and improving its quality. Multiple local thresholds 8 can be set along the X-axis.

[0073] The length L2 of the second extension section can be 23mm to 25mm, which can effectively clamp the preform 2000, reduce the excess of the process surface 2200, and avoid material waste.

[0074] The angle between the second extension and the first extension ranges from 99° to 100°. When the positions of the local sill 8 and the flange assembly 230 change in the YZ plane, the clamping force at the first extension or the second extension can change, which is beneficial for adjustment and can clamp the process surface 2200 as needed.

[0075] The radius R of the arc segment ranges from 9mm to 12mm; for example, the radius R is 10mm. The arc segment ensures smooth and stable material flow; it is sensitive to positional changes, ensuring effective adjustment. The length L1 of the first extension segment can be adapted to the design of other segments.

[0076] refer to Figure 1 , Figure 2The pressure assembly 120 includes a positive pressure plate 1 disposed on the upper die body 110 and a side pressure plate 2 disposed on the positive pressure plate 1. The side pressure plate 2 can be connected to the upper end of the positive pressure plate 1. The positive pressure plate 1 can be used to stamp the inner boundary of the side panel cover.

[0077] The punch assembly 220 includes a fixed punch 3, a split movable punch 4, and a normal floating punch 5. The fixed punch 3 is disposed on the lower die body 210, the split movable punch 4 is disposed between the fixed punch 3 and the lower die body 210, and the normal floating punch 5 is disposed on the split movable punch 4. The fixed punch 3 can cooperate with the positive pressure plate 1. The split movable punch 4 can cooperate with the side pressure plate 2. The normal floating punch 5 can cooperate with both the positive pressure plate 1 and the side pressure plate 2.

[0078] The designed distance between the normal floating punch 5 and the positive pressure plate 1 has an overpressure of 0.2mm to 0.25mm relative to the thickness of the corresponding position of the flange. By pressing the A-side 3100 of the side panel cover, the flowability of the material on that side can be controlled. In addition, the overpressure dimension can be adjusted according to the coloring requirements of the A-side 3100.

[0079] refer to Figure 1 , Figure 2 , Figure 6 and Figure 7 For example, the upper mold body 110 includes a first drive block 111, a second drive block 112, and a convex leg 113.

[0080] The die 1000 for stamping flanged parts also includes a trolley 240. The trolley 240 includes a guide block 241, a side guide plate 242, and a trapezoidal guide plate 243. The trolley 240 is located below the fixed punch 3, and the guide block 241 can pass through the fixed punch 3.

[0081] The second drive block 112 slides and matches the guide block 241 to drive the trolley 240 to slide relative to the lower die body 210. The wedge surface of the second drive block 112 can be parallel to the Z-axis direction and oblique to the Y-axis direction, and the trolley 240 can slide along the X-axis direction. The side guide plate 242 slides and matches the split movable punch 4 to drive the split movable punch 4 to slide relative to the lower die body 210. Specifically, the split movable punch 4 can slide along the Z-axis direction to realize the working state and the non-working state. The trapezoidal guide plate 243 slides and matches the normal floating punch 5 to drive the normal floating punch 5 to slide relative to the split movable punch 4 to realize the working state and the non-working state.

[0082] refer to Figure 1 , Figure 8 and Figure 9The flanging assembly 230 includes a flanging wedge 601. The first driving block 111 slides and matches the flanging wedge 601 to drive the flanging assembly 230 to slide relative to the lower mold body 210. The sliding direction can be approximately along the Z-axis and can be slightly deflected.

[0083] For example, the flange assembly 230 includes a flange structure 6 and a side-pressing structure 7. The flange structure 6 may be a groove-shaped structure that accommodates the side-pressing structure 7. The flange structure 6 may include a flange wedge 601.

[0084] like Figure 1 As shown, three consecutive side-pressure structures 7 can be designed; alternatively, the side-pressure structure 7 can be considered as multiple relatively independent components. (Refer to 1 and...) Figure 2 In a direction away from the pressing assembly 120, the flange portion 602 of the flange structure 6 and the upper sill portion 701 of the side pressing structure 7 are arranged sequentially. The flange portion 602 can be a one-piece structure, which helps to eliminate splicing gaps and ensure a better flange effect. In other embodiments, a single one-piece side pressing structure 7 can be provided. Multiple side pressing structures 7 can better adapt to complex surface shapes.

[0085] refer to Figure 10 and Figure 11 The side pressure structure 7 is adjustablely connected to the flange structure 6. In the YZ plane, the position of the side pressure structure 7 can be adjusted in various directions. Specifically, roughly along the Y-axis direction, a second gasket can be provided between the inner walls of the side pressure structure 7 and the flange structure 6. This second gasket can control the distance between the upper sill 701 and the local sill 8, effectively controlling the distance between the second extension of the local sill 8 and the upper sill 701, thus controlling the flow of material and ensuring the flange effect and the clamping effect on the process surface 2200.

[0086] The flanging assembly 230 also includes a balance adjustment block 231, which is disposed on the side of the side pressure structure 7 and located on the side of the upper sill 701 facing away from the flanging portion 602. The balance adjustment block 231 is used to abut against the punch assembly 220 during mold closing, specifically against the split movable punch 4. The balance adjustment block 231 controls the distance between the upper sill 701 and the partial sill 8, especially the distance approximately along the Z-axis direction. The clamping force of the first extension of the partial sill 8 and the upper sill 701 on the material can be adjusted. In addition, the balance adjustment block 231 also controls the relative position of the upper sill 701 and the split movable punch 4 in the punch assembly 220.

[0087] At least one third shim (not shown) may also be provided between the balance adjustment block 231 and the side pressure structure 7. Figure 11Without shims, the distance between the upper sill 701 and the split movable punch 4 is relatively close. The thickness of these shims can range from 0.05mm to 0.65mm. The balance adjustment block 231 is located on the outside of the side pressure structure 7, which enables quick adjustment and directly ensures the mold closing position with good adjustment accuracy.

[0088] The lower die body 210 and the upper die body 110 are arranged opposite each other along the stamping direction, and the flanging assembly 230 and the punch assembly 220 are arranged opposite each other along the flanging direction. (See reference) Figure 12 The punch assembly 220 is on the left, the flanging assembly 230 is on the right, and the pressure surface of the side pressure plate 2 is on the pressure surface of the flanging portion 602. Simultaneously, the side pressure plate 2 is on the left side of the flanging wedge 601. The mold 1000 for stamping flanged parts may include a balance block 201 and a balance cylinder 202. The balance block 201 may be disposed on the side pressure plate 2, and the balance cylinder 202 may be disposed on the flanging assembly 230, for example, on the flanging wedge 601 of the flanging structure 6. The balance cylinder 202 can abut against the balance block 201 to balance the force exerted by the side pressure plate 2 on the split movable punch 4. During the stamping process, the balance cylinder 202 can disengage from the balance block 201.

[0089] refer to Figure 7 and Figure 8 The die 1000 for stamping flanged parts may include multiple balance blocks 201 and multiple balance cylinders 202. The multiple balance blocks 201 may be arranged approximately along the X-axis direction and may be arranged in a conformal manner along the extension direction of the side pressure plate 2; one balance block 201 may correspond to at least one balance cylinder 202. The balance cylinder 202 may be a nitrogen cylinder.

[0090] The lower die body 210 may include a concave groove 211. The convex legs 113 of the upper die body 110 are inserted into the concave groove 211 along the stamping direction. (Reference) Figure 2 The flange wedge 601 can be subjected to a force to the left. The convex leg 113 and the concave groove 211 can be disposed on the side of the punch assembly 220 opposite to the flange assembly 230. The die 1000 for stamping flanged parts also includes a side guide plate 114, which is disposed between the convex leg 113 and the concave groove 211 along the flange direction. The side guide plate 114 can control the gap between the convex leg 113 and the concave groove 211 along the flange direction, thereby eliminating the lateral force generated during the stamping process and balancing the die. The upper die body 110 controls the movement of each component in the lower die 200, making die control easy and ensuring stability.

[0091] By adjusting the local sill 8 and the side pressure structure 7, manufacturing deviations or wear during use can be absorbed, which is beneficial for trial production, manufacturing, adjustment, and maintenance. While maintaining a relatively constant distance between the local sill 8 and the side pressure structure 7, their overall positions relative to the separate movable punch 4 can also differ.

[0092] refer to Figure 13 In other embodiments, the partial sill 8 is adjustablely fitted into the flanging assembly 230, specifically into the side pressing structure 7. The pressing surface of the partial sill 8 may continue with the pressing surface of the upper sill 701 along the X-axis. This partial sill 8 may be referred to as the partial upper sill. The partial sill 8 may clamp the process surface 2200 of the preform sheet 2000 of the flanging part with the split movable punch 4. Exemplarily, the partial sill 8 cooperates with a corresponding partial lower sill, and the required clamping force is achieved by adjustment.

[0093] By setting at least one adjustable local threshold 8, a mold 1000 for stamping and flanging parts is realized that integrates flexibility, lightweight and high efficiency.

[0094] In some embodiments, the movement of the die 1000 for stamping flanged parts can be pneumatically controlled and can be controlled separately. The upper die body 110 can be fixed to the press slide and can be pressed down. When the first automatic air source angle is 10°, the cylinder vents air to push the split movable punch 4 to start moving to the working state. When the second automatic air source angle is 20°, the cylinder vents air to push the trolley 240 to start moving. At this time, the trapezoidal guide plate 243 on the trolley 240 pushes the normal floating punch 5 to start moving to the working state and finally reaches the working position.

[0095] The upper mold body 110 can move upward with the press slide. When the angle of the second automatic air source is 190°, the cylinder is vented and pulls the trolley 240 to start moving. At this time, the normal floating punch 5 starts to move to the non-working state. When the angle of the first automatic air source is 200°, the cylinder is vented and pulls the split movable punch 4 to the non-working state, and finally reaches the starting position.

[0096] In some embodiments, when the upper mold 100 includes a first driving block 111 and a second driving block 112, and the lower mold 200 has a guide block 241 and a flange wedge 601, the lifting and lowering of the upper mold 100 can be directly controlled.

[0097] The upper mold body 110 is fixed on the press slide block and moves downward to the bottom dead center 245mm. The first drive block 111 initially contacts the guide block 241 of the trolley 240.

[0098] The upper mold body 110 moves downward to a distance of 240mm from the bottom dead center. At this time, the trolley 240 is subjected to the force of the first drive block 111, and then the side guide plate 242 begins to push the split movable punch 4 to move.

[0099] The upper die body 110 moves downwards to a distance of 210mm from the bottom dead center. The first drive block 111 and the guide block 241 are fully engaged, and the side guide plate 242 and the guide surface of the split movable punch 4 are fully engaged. At this time, the split movable punch 4 reaches the working state and stops moving. The stroke (ST) corresponding to the split movable punch 4 is 30mm.

[0100] When the upper die body 110 moves downward to a distance of 200mm from the bottom dead center, the trapezoidal guide plate 243 of the trolley 240 and the trapezoidal guide plate of the normal floating punch 5 initially come into contact. When the upper die body 110 is fixed at a distance of 160mm from the bottom dead center of the press slide, the trapezoidal guide plate 243 and the trapezoidal guide plate of the normal floating punch 5 complete the engagement. At this time, the normal floating punch 5 reaches the working state, that is, the stroke (ST) corresponding to the normal floating punch 5 is 40mm.

[0101] The upper mold body 110 is fixed at the lower dead center of the press slide at a downward running distance of 137.5mm. The first drive block 111 forces the flange wedge 601 to start moving, and the flange part 602 of the flange structure 6 and the side pressure structure 7 move accordingly.

[0102] The upper mold body 110 is fixed at the bottom dead center of the press slide at a downward running distance of 82mm, and the convex leg 113 is initially in contact with the concave groove 211.

[0103] The upper die body 110 is fixed at the bottom dead center of the press slide at a downward running distance of 70mm. The positive pressure plate 1 starts to work. At this time, the normal pressure surface of the positive pressure plate 1 is in complete contact with the upper surface of the normal floating punch 5, controlling the material flow of the inner boundary of the prefabricated flange 2100 in the direction of the door opening. According to the theoretical die surface data, the coloring is done by grinding, and the side pressure surface of the auxiliary side pressure plate 2 increases its pressure force.

[0104] The upper die body 110 is fixed at the bottom dead center of the press slide at a distance of 60mm from the bottom, and the side pressure plate 2 begins to work. The side pressure plate 2 is equipped with a balance block 201, which is used to balance the force exerted by the side pressure surface on the split movable punch 4, thereby increasing and balancing the pressure force of the side pressure plate 2.

[0105] The upper mold body 110 is fixed at the lower dead center of the press slide at a downward running distance of 52.5mm. The side pressure structure 7 starts to move. The adjustable upper sill 701 of the side pressure structure 7 and the adjustable partial sill 8 cooperate with each other to clamp the product material.

[0106] The upper mold body 110 is fixed at the bottom dead center of the press slide's downward travel distance of 35mm. The flanging structure 6 contacts the split movable punch 4 for initial flanging, at which point the product material is completely under control. During the flanging process, the surfaces of the first and second extension sections in the local sill 8 cooperate with the corresponding two pressure surfaces in the upper sill 701 to control the flowability and stability of the product material.

[0107] The upper die body 110 is fixed at the lower dead center of the press slide at 0mm, and the flanging and shaping is completed. At this time, the convex leg 113 and the concave groove 211 are fully engaged, eliminating the force between the flanging wedge 601 and the split movable punch 4. The die 1000 used for stamping flanged parts has more stable formability during mass production.

[0108] This application provides a stamped part, which can refer to a side panel cover of a finished product or a pre-formed sheet 2000 after stamping. The stamped part is obtained according to the aforementioned mold 1000 for stamping and flanging parts, and has good morphological quality. Surface A 3100 is smooth and complete, the welded surface 3200 is of good quality, and complex surfaces such as curved surfaces 3300 are qualified.

[0109] The technical features of the above-disclosed embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The embodiments disclosed above merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of patent protection claimed by this application. Therefore, the scope of patent protection of this application should be determined by the appended claims.

Claims

1. A die for stamping flanged parts, characterized in that, include: Upper mold body; The material pressing assembly is disposed on the upper mold body; The lower mold body is disposed opposite to the upper mold body; A punch assembly is disposed on the lower die body, and at least a portion of the punch assembly is used to cooperate with the blank holder assembly; The flange assembly is slidably connected to the lower die body and is used to cooperate with the punch assembly; and A partial retainer, adjustablely fitted at the punch assembly or adjustablely fitted at the flange assembly, the partial retainer being used to hold the process surface of the preform sheet of the flanged part.

2. The die for stamping and flanging parts according to claim 1, characterized in that, The partial sill has a model line extending in a direction away from the pressing assembly. The model line includes an arcuate segment that protrudes in the opposite direction to the flange direction, a first extension segment connected to the arcuate segment, and a second extension segment that deflects toward the protruding side of the arcuate segment relative to the first extension segment.

3. The die for stamping flanged parts according to claim 2, characterized in that, The radius of the arc segment ranges from 9 mm to 12 mm; The angle between the second extension segment and the first extension segment ranges from 99° to 100°; The length of the second extension is 23mm to 25mm; The height of the model line along the stamping direction is 47mm to 49mm.

4. The die for stamping and flanging parts according to claim 1, characterized in that, The partial sill is an adjustable lower sill connected to the lower die body, and the partial lower sill is fitted into the punch assembly for cooperation with the flanging assembly.

5. The die for stamping flanged parts according to claim 4, characterized in that, The flange assembly includes a flange structure and a side pressing structure; along the direction away from the pressing assembly, the flange portion of the flange structure and the upper sill portion of the side pressing structure are arranged sequentially. The side-pressure structure is adjustablely connected to the flange structure to control the distance between the upper sill and the lower sill.

6. The die for stamping flanged parts according to claim 5, characterized in that, The flange assembly also includes a balance adjustment block, which is disposed on the side pressure structure and located on the side of the upper sill facing away from the flange portion. The balance adjustment block is used to abut against the punch assembly when the mold is closed, so as to control the distance between the upper sill and the lower sill.

7. The die for stamping flanged parts according to claim 1, characterized in that, The pressing assembly includes a positive pressing plate disposed on the upper mold body and a side pressing plate disposed on the positive pressing plate; The punch assembly includes a fixed punch, a split movable punch, and a normal floating punch. The fixed punch is disposed on the lower die body, the split movable punch is disposed between the fixed punch and the lower die body, and the normal floating punch is disposed on the split movable punch. The designed distance between the normal floating punch and the positive pressure plate has an overpressure of 0.2 mm to 0.25 mm relative to the thickness of the corresponding position of the flange.

8. The die for stamping flanged parts according to claim 7, characterized in that, The upper mold body includes a first driving block and a second driving block, and the flanging assembly includes a flanging wedge. The first driving block and the flanging wedge are slidably matched to drive the flanging assembly to slide relative to the lower mold body. The mold also includes a pulley, a counterweight, and a counterbalance cylinder; The trolley includes a guide block, a side guide plate, and a trapezoidal guide plate. The second driving block slides and matches the guide block to drive the trolley to slide relative to the lower die body. The side guide plate slides and matches the split movable punch to drive the split movable punch to slide relative to the lower die body. The trapezoidal guide plate slides and matches the normal floating punch to drive the normal floating punch to slide relative to the split movable punch. The balance block is disposed on the side pressure plate, and the balance cylinder is disposed on the flange assembly. The balance cylinder is capable of pressing against the balance block.

9. The die for stamping flanged parts according to any one of claims 1 to 8, characterized in that, The lower die body and the upper die body are arranged opposite each other along the stamping direction, and the flanging assembly and the punch assembly are arranged opposite each other along the flanging direction; One of the upper mold body and the lower mold body includes a convex leg and the other includes a concave groove. The convex leg and the concave groove are inserted into each other along the stamping direction. The mold also includes a side guide plate, which is disposed between the convex leg and the concave groove along the flange direction.

10. A stamped part, characterized in that, The die for stamping flanged parts is obtained according to any one of claims 1 to 9.

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