Stamping die and drawing method for rear door inner panel

Abstract

The present application belongs to the technical field of vehicle production, and discloses a stamping die and a drawing method for a rear door inner plate, wherein the stamping die comprises a lower die mechanism and an upper die mechanism; the lower die mechanism comprises a lower die seat, a male die and a pressure ring, the male die is fixedly installed on the lower die seat, and the pressure ring is movably arranged on the peripheral part of the male die along the stamping direction; the upper die mechanism comprises an upper die seat, a female die, a nitrogen cylinder and a pressure plate, the female die is fixedly installed on the upper die seat, one end of the nitrogen cylinder is connected with the upper die seat, the other end of the nitrogen cylinder is connected with the pressure plate, the pressure plate is used for pressing the pressing area of the plate to the male die, and the female die is used for pressing the stamping area of the plate to the pressure ring and the male die. The pressure plate is used for pressing the pressing area of the plate, the drawing of the pressing area is controlled, and the production quality of the plate is improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle manufacturing technology, and in particular to stamping dies and a method for drawing the inner panel of a rear door. Background Technology

[0002] Due to its depth, the inner rear door panel of a car has a significant risk of cracking during the molding process. To reduce this risk, a piercing knife process is usually used to achieve the drawing process.

[0003] However, when the piercing knife process is used in the production process, the debris generated at the piercing point causes crushing damage, resulting in frequent quality defects, increased production downtime, and seriously affecting the production quality and efficiency of the rear door inner panel. Summary of the Invention

[0004] The purpose of this invention is to provide a stamping die and a method for drawing the inner panel of a car rear door, which uses a pressure plate to press the pressure area of ​​the sheet metal, controls the drawing feed in the pressure area, and improves the production quality of the sheet metal.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Stamping die, the stamping die comprising:

[0007] The lower die mechanism includes a lower die base, a punch, and a pressure ring. The punch is fixedly installed on the lower die base, and the pressure ring is movably disposed around the punch in the stamping direction.

[0008] The upper die mechanism includes an upper die base, a die cavity, a nitrogen cylinder, and a pressure plate. The die cavity is fixedly installed on the upper die base. One end of the nitrogen cylinder is connected to the upper die base, and the other end of the nitrogen cylinder is connected to the pressure plate. The pressure plate is used to press the pressing area of ​​the sheet metal against the punch. The die cavity is used to press the stamping area of ​​the sheet metal against the blank holder and the punch.

[0009] As an optional technical solution, the top of the punch is provided with a support platform, and the support platform is provided with a groove at the position opposite to the pressure plate, the depth of the groove being a first preset value.

[0010] As an optional technical solution, the bottom of the settling tank is a circular plane, and a first arc surface is arranged around the periphery of the settling tank. The first arc surface is adjacent to and tangent to the bottom of the settling tank. A second arc surface is arranged around the periphery of the first arc surface. The inner edge of the second arc surface is adjacent to and tangent to the first arc surface, and the outer edge of the second arc surface is adjacent to and tangent to the top surface of the support platform. The center of the first arc surface is located outside the support platform, and the center of the second arc surface is located inside the support platform. The arc radius of the first arc surface and the arc radius of the second arc surface are equal and both are second preset values.

[0011] As an optional technical solution, the first preset value is 3 mm and the second preset value is 5 mm.

[0012] The method for drawing the inner panel of the rear door is implemented using the stamping die described above, and the method includes the following steps:

[0013] S100. Divide the sheet metal into a stamping area and a pressing area, and divide the stamping area into a side area and a middle area;

[0014] S200. Place the sheet metal on the lower die mechanism, and in the stamping direction, align the side area with the pressure ring and the pressure area with the pressure plate.

[0015] S300, Start the stamping action, causing the upper die mechanism to descend and move towards the lower die mechanism, and the die cavity to contact the side area;

[0016] S400, the upper mold mechanism continues to descend and move closer to the lower mold mechanism, and the pressure plate contacts the pressure area;

[0017] S500, the upper die mechanism continues to descend and move closer to the lower die mechanism, and the die contacts the middle area until the stamping is completed.

[0018] As an optional technical solution, in step S100, after the sheet metal is divided into the pressing area, process holes are also opened in the pressing area.

[0019] As an optional technical solution, in step S200, the sheet metal is supported by the pressure ring and the support platform of the lower die mechanism.

[0020] As an optional technical solution, in step S400, the distance between the lower mold mechanism and the bottom position is detected. When the distance reaches a third preset value, the pressure plate begins to contact the pressure area.

[0021] As an optional technical solution, the third preset value is 10 mm.

[0022] As an optional technical solution, the following steps are performed after step S500:

[0023] S600. The sheet material is cut, and the cutting trajectory surrounds the periphery of the pressing area, and the distance between the cutting trajectory and the edge of the pressing area is 5 mm.

[0024] The beneficial effects of this invention are:

[0025] This invention provides a stamping die and a method for drawing the inner panel of a rear door. The stamping die includes an upper die mechanism and a lower die mechanism. The lower die mechanism includes a lower die base, a punch, and a blank holder. The punch is fixedly installed on the lower die base, and the blank holder is movably disposed around the punch along the stamping direction. The upper die mechanism includes an upper die base, a die, a nitrogen cylinder, and a pressure plate. The die is fixedly installed on the upper die base. One end of the nitrogen cylinder is connected to the upper die base, and the other end of the nitrogen cylinder is connected to the pressure plate. The pressure plate is used to press the pressing area of ​​the sheet metal against the punch, and the die is used to press the stamping area of ​​the sheet metal against the blank holder and the punch. When drawing and stamping sheet metal, the first step is to divide the sheet metal into a stamping area and a blanking area, and further divide the stamping area into a side area and a middle area. The second step is to place the sheet metal on the lower die mechanism, aligning the side area with the blanking ring and the blanking area with the blanking plate in the stamping direction. The third step is to initiate the stamping action, causing the upper die mechanism to descend towards the lower die mechanism, with the die contacting the side area. The fourth step is to continue descending towards the lower die mechanism, with the blanking plate contacting the blanking area. The fifth step is to continue descending towards the lower die mechanism, with the die contacting the middle area, until the stamping is completed. This invention first uses the die to press the side area against the blanking ring, pre-positioning the sheet metal to prevent deviation. Then, the blanking plate presses the blanking area against the punch, controlling the drawing and feeding of the blanking area. Finally, the die presses the middle area against the punch to achieve the stamping process. This invention eliminates the need for puncture processes, avoiding the generation of debris and preventing crushing defects caused by debris, thus effectively reducing scrap rate and downtime. Attached Figure Description

[0026] Figure 1 This is a partial structural layout diagram of the sheet metal and stamping die of the present invention;

[0027] Figure 2 This is a cross-sectional view of a portion of the structure of the stamping die of the present invention;

[0028] Figure 3 yes Figure 2 A magnified view of a portion of position A in the middle;

[0029] Figure 4 This is a partial enlarged view of the support platform of the present invention;

[0030] Figure 5 This is a flowchart of the method for drawing the inner panel of the rear door of the present invention.

[0031] In the picture:

[0032] 1. Lower die mechanism; 11. Lower die base; 12. Punch; 121. Support platform; 122. Countersunk groove; 123. First arc surface; 124. Second arc surface; 13. Pressure ring;

[0033] 2. Upper mold mechanism; 21. Upper mold base; 22. Die; 23. Nitrogen cylinder; 24. Pressure plate;

[0034] 100. Sheet material; 101. Pressing area; 102. Stamping area; 1021. Side area; 1022. Middle area. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0036] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0039] Example 1

[0040] like Figures 1 to 4As shown, this embodiment provides a stamping die, which includes a lower die mechanism 1 and an upper die mechanism 2. The lower die mechanism 1 includes a lower die base 11, a punch 12, and a blank holder 13. The punch 12 is fixedly installed on the lower die base 11, and the blank holder 13 is movably disposed around the punch 12 along the stamping direction. The upper die mechanism 2 includes an upper die base 21, a die 22, a nitrogen cylinder 23, and a pressure plate 24. The die 22 is fixedly installed on the upper die base 21. One end of the nitrogen cylinder 23 is connected to the upper die base 21, and the other end of the nitrogen cylinder 23 is connected to the pressure plate 24. The pressure plate 24 is used to press the pressing area 101 of the sheet metal 100 against the punch 12, and the die 22 is used to press the stamping area 102 of the sheet metal 100 against the blank holder 13 and the punch 12.

[0041] When stamping sheet metal 100 using the stamping die of this embodiment, sheet metal 100 is placed in lower die mechanism 1, and upper die mechanism 2 is driven to descend towards lower die mechanism 1. First, die 22 presses the side area 1021 against the blank holder 13 to pre-position sheet metal 100 and prevent it from shifting. After upper die mechanism 2 continues to descend a certain distance, pressure plate 24 contacts pressure area 101 and presses pressure area 101 against punch 12, controlling the drawing and feeding of pressure area 101 to prevent it from cracking. Upper die mechanism 2 continues to descend a certain distance until die 22 presses the middle area 1022 against punch 12, completing the stamping. When stamping sheet metal 100 using the stamping die of this embodiment, a puncture process is not required, avoiding the generation of debris and preventing damage caused by debris, effectively reducing scrap rate and downtime.

[0042] When the puncture process is used, debris is generated. During the automated stamping production process, the debris is carried to the surface of the mold, causing indentations on the surface of the inner panel of the rear door.

[0043] To solve the above problems, this embodiment does not use the puncture process. The sheet material 100 referred to in this embodiment is the inner panel of the rear door of the car. The inner panel of the rear door needs to have speaker holes. Before stamping, process holes are set at the positions where speaker holes need to be opened to prevent tearing in this area, so as to ensure the surface quality of this area. The pressure plate 24 is used to press the material in this area to control the material flow in this area, reduce the risk of cracking, and avoid the problem of generating debris.

[0044] Optionally, the pressure ring 13 is supported by an elastic member so that the pressure ring 13 can move along the stamping direction.

[0045] Optionally, the top of the punch 12 is provided with a support platform 121, and a recess 122 is provided at the position of the support platform 121 opposite the pressure plate 24. The depth of the recess 122 is a first preset value. After the die 22 presses the side area 1021 against the pressure ring 13, it continues to descend, and the side area 1021 deforms. Then the pressure plate 24 contacts the pressure area 101 and presses the pressure area 101 into the recess 122. Due to the characteristics of the nitrogen cylinder 23, the upper die mechanism 2 can continue to descend a certain distance, and the pressure of the pressure plate 24 on the pressure area 101 increases. The pressure plate 24 presses the pressure area 101 completely into the recess 122, and the die 22 presses the middle area 1022 against the punch 12, completing the stamping.

[0046] When the inner panel of the rear door is drawn, if the drawing depth is too deep and the draft angle and radius are too small, the drawn sheet material will not flow smoothly and will easily crack during forming.

[0047] To address the aforementioned issues, this embodiment sets the bottom of the settling tank 122 as a circular plane. A first arc surface 123 surrounds the periphery of the settling tank 122, adjacent to and tangent to the bottom of the settling tank 122. A second arc surface 124 surrounds the periphery of the first arc surface 123, with its inner edge adjacent to and tangent to the first arc surface 123, and its outer edge adjacent to and tangent to the top surface of the support platform 121. The center of the arc of the first arc surface 123 is located outside the support platform 121, while the center of the arc of the second arc surface 124 is located inside the support platform 121. The radius of the arc of the first arc surface 123 and the radius of the arc of the second arc surface 124 are equal and both are second preset values. The first preset value is 3 mm, and the second preset value is 5 mm. By setting the sink 122 and controlling its depth, and by using the first arc surface 123 and the second arc surface 124, the problems caused by the draft angle and the radius of curvature are improved, and cracking of the pressure zone 101 is prevented.

[0048] Example 2

[0049] like Figure 5 As shown, this embodiment provides a method for drawing the inner panel of a vehicle rear door, which is implemented using a stamping die as described in Embodiment 1. The method for drawing the inner panel of a vehicle rear door includes the following steps:

[0050] S100: Divide the sheet metal 100 into a stamping area 102 and a pressing area 101, and further divide the stamping area 102 into a side area 1021 and a middle area 1022. Distinguishing between the stamping area 102 and the pressing area 101 on the sheet metal 100 prevents the pressing plate 24 from pressing onto the stamping area 102; dividing the stamping area 102 into the side area 1021 and the middle area 1022 creates a difference in the sequence of stamping steps.

[0051] S200. Place the sheet metal 100 on the lower die mechanism 1. In the stamping direction, align the side area 1021 with the pressure ring 13 and the pressure area 101 with the pressure plate 24. Aligning the side area 1021 with the pressure ring 13 and the pressure area 101 with the pressure plate 24 avoids incorrect pressing positions.

[0052] S300, Initiate the stamping action, causing the upper die mechanism 2 to descend towards the lower die mechanism 1, and the die 22 to contact the side area 1021. Between the upper die mechanism 2 and the sheet metal 100, the die 22 first contacts the side area 1021. After the die 22 contacts the side area 1021, the upper die mechanism 2 continues to descend towards the lower die mechanism 1, and the die 22 presses the side area 1021 against the pressure ring 13. During this process, the pressure ring 13 is subjected to pressure and descends.

[0053] S400, the upper die mechanism 2 continues to descend towards the lower die mechanism 1, and the pressure plate 24 contacts the pressure area 101. Between the upper die mechanism 2 and the sheet metal 100, the second contact point is the contact between the pressure plate 24 and the pressure area 101. The upper die mechanism 2 continues to descend towards the lower die mechanism 1, and the pressure plate 24 presses the pressure area 101 tightly against the recess 122 of the support platform 121, controlling the material flow of the pressure area 101.

[0054] S500, the upper die mechanism 2 continues to descend towards the lower die mechanism 1, and the die 22 contacts the middle area 1022 until the stamping is completed. The upper die mechanism 2 continues to descend to the bottom position, and the sheet metal 100 is stamped and formed.

[0055] This embodiment does not require a puncture process, thus avoiding the generation of debris and preventing crushing defects caused by debris, effectively reducing scrap rate and downtime rate.

[0056] Optionally, in step S100, after dividing the sheet metal 100 into pressing areas 101, process holes are also made in the pressing areas 101. The process holes can prevent the pressing areas 101 from cracking, so as to ensure the surface quality of the pressing areas 101.

[0057] Optionally, in step S200, the sheet metal 100 is supported by the pressure ring 13 and the support platform 121 of the lower die mechanism 1. The support platform 121 supports the middle part of the sheet metal 100 to prevent the middle part of the sheet metal 100 from being suspended and sagging.

[0058] Optionally, in step S400, the distance between the lower mold mechanism 1 and the bottom position is detected. When the distance reaches a third preset value, the pressure plate 24 begins to contact the pressure area 101. When the lower mold mechanism 1 is 10 mm before bottoming, the pressure plate 24 begins to contact the pressure area 101. As the lower mold mechanism 1 continues to descend, the nitrogen cylinder 23 is compressed, and the pressure of the pressure plate 24 on the pressure area 101 increases.

[0059] The "bottom position" refers to the position where the lower die mechanism 1 descends to the bottom. After the lower die mechanism 1 descends to the bottom, the lower die mechanism 1 and the upper die mechanism 2 complete the stamping of the sheet metal 100.

[0060] Optional, the third preset value is 10 mm.

[0061] Optionally, the following steps may be performed after step S500:

[0062] S600: The sheet metal 100 is cut, with the cutting path surrounding the periphery of the pressing area 101, and the distance between the cutting path and the edge of the pressing area 101 is 5 mm. In this step, the sheet metal 100 is cut to obtain a sound hole, the radius of which is 5 mm larger than the radius of the pressing area 101.

[0063] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A stamping die, characterized in that, The stamping die includes: The lower die mechanism (1) includes a lower die base (11), a punch (12) and a pressure ring (13). The punch (12) is fixedly installed on the lower die base (11), and the pressure ring (13) is movably disposed around the punch (12) along the stamping direction. The upper die mechanism (2) includes an upper die base (21), a die cavity (22), a nitrogen cylinder (23), and a pressure plate (24). The die cavity (22) is fixedly installed on the upper die base (21). One end of the nitrogen cylinder (23) is connected to the upper die base (21), and the other end of the nitrogen cylinder (23) is connected to the pressure plate (24). The pressure plate (24) is used to press the pressing area (101) of the sheet metal (100) against the punch (12). The die cavity (22) is used to press the stamping area (102) of the sheet metal (100) against the pressure ring (13) and the punch (12). The top of the punch (12) is provided with a support platform (121), and the support platform (121) is provided with a groove (122) facing the pressure plate (24), and the depth of the groove (122) is a first preset value; The bottom of the settling trough (122) is a circular plane. A first arc surface (123) is arranged around the periphery of the settling trough (122). The first arc surface (123) is adjacent to and tangent to the bottom of the settling trough (122). A second arc surface (124) is arranged around the periphery of the first arc surface (123). The inner edge of the second arc surface (124) is adjacent to and tangent to the first arc surface (123). The outer edge of the second arc surface (124) is adjacent to and tangent to the top surface of the support platform (121). The center of the arc of the first arc surface (123) is located outside the support platform (121), and the center of the arc of the second arc surface (124) is located inside the support platform (121). The arc radius of the first arc surface (123) and the arc radius of the second arc surface (124) are equal and both are second preset values.

2. The stamping die according to claim 1, characterized in that, The first preset value is 3 mm, and the second preset value is 5 mm.

3. A method for drawing the inner panel of a vehicle rear door, characterized in that, The method for drawing the inner rear door panel, implemented using the stamping die as described in any one of claims 1-2, includes the following steps: S100, the sheet metal (100) is divided into a stamping area (102) and a pressing area (101), and the stamping area (102) is divided into a side area (1021) and a middle area (1022). S200, the sheet metal (100) is placed on the lower die mechanism (1), and in the stamping direction, the side area (1021) is aligned with the pressure ring (13) and the pressure area (101) is aligned with the pressure plate (24). S300, Start the stamping action, so that the upper die mechanism (2) descends and approaches the lower die mechanism (1), and the die (22) contacts the side area (1021); S400, the upper mold mechanism (2) continues to descend and move closer to the lower mold mechanism (1), and the pressure plate (24) contacts the pressure area (101); S500, the upper die mechanism (2) continues to descend and approach the lower die mechanism (1), and the die (22) contacts the middle area (1022) until the stamping is completed.

4. The method for drawing the inner panel of the rear door according to claim 3, characterized in that, In step S100, after dividing the sheet material (100) into the pressing area (101), process holes are also opened in the pressing area (101).

5. The method for drawing the inner panel of the rear door according to claim 3, characterized in that, In step S200, the sheet metal (100) is supported by the pressure ring (13) and the support platform (121) of the lower mold mechanism (1).

6. The method for drawing the inner panel of the rear door according to claim 3, characterized in that, In step S400, the distance between the lower mold mechanism (1) and the bottom position is detected. When the distance reaches a third preset value, the pressure plate (24) begins to contact the pressure area (101).

7. The method for drawing the inner panel of the rear door according to claim 6, characterized in that, The third preset value is 10 millimeters.

8. The method for drawing the inner panel of the rear door according to claim 3, characterized in that, After step S500, the following steps are performed: S600, the sheet material (100) is cut, the cutting trajectory surrounds the periphery of the pressing area (101), and the distance between the cutting trajectory and the edge of the pressing area (101) is 5 mm.

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