Cold pressing die for central passage sheet metal part of light mass automobile

Abstract

This application relates to a cold pressing mold for lightweight automotive center console sheet metal parts, including an upper mold and a lower mold. The lower mold has an outer groove on its top surface, and an ejector cylinder is mounted on the inner wall of the groove. The piston rod of the ejector cylinder faces upwards, and the top of the ejector cylinder is used to drive the sheet metal part out of the lower mold. A loosening component is provided within the outer groove, including a reciprocating structure and two striking rods connected at both ends. The lower mold's cross-section includes angles a and b located on its top surface, and the two striking rods face angles a and b respectively. The reciprocating structure drives the striking rods to slide back and forth, with the sliding direction of the striking rods being the direction of the line connecting angles a and b. The striking rods are used to strike the sheet metal part near angles a and b. By using an ejector cylinder to eject the sheet metal part before unloading, unloading is convenient, thereby improving production efficiency. By using striking rods to strike the sheet metal part before unloading, deformation of the sheet metal part is less likely.

Description

Technical Field

[0001] This application relates to the technical field of cold pressing dies for sheet metal parts, and in particular to a cold pressing die for a lightweight automotive center console sheet metal part. Background Technology

[0002] With the continuous in-depth research and widespread application of automotive lightweighting, the reduction in overall vehicle weight directly leads to the optimization of stamped parts structures, requiring not only higher strength but also lighter weight. The central tunnel of a car is located in the middle of the floor between the driver and passenger seats, and has high requirements for collision safety. Its shape and dimensions are relatively large, and it requires multiple stamping processes during production.

[0003] Utility model patent CN216065185U discloses a flanging die for stamping sheet metal parts of automotive center consoles, belonging to the field of stamping die technology. It includes an upper die base and a lower die base. A punch is provided on the lower die base, and a stamping die is provided on the upper die base. The top of the stamping die is embedded in the upper die base, and the length of the portion of the stamping die protruding from the upper die base is equal to one-third of the overall length of the stamping die. The bottom of the stamping die has an inwardly recessed forming groove, and the cross-section of the forming groove is trapezoidal.

[0004] Regarding the technology in the aforementioned patent, the sheet metal needs to be removed manually when taking it off the flanging die. This is because the sheet metal has a complex surface structure with many uneven areas. Furthermore, due to the cold pressing process, the overall surface of the sheet metal fits closely to the inner wall of the mold cavity, making removal inconvenient and reducing processing efficiency. Summary of the Invention

[0005] To facilitate the removal of sheet metal parts, this application provides a cold pressing mold for lightweight automotive center console sheet metal parts.

[0006] This application provides a cold pressing mold for lightweight automotive center console sheet metal parts, which adopts the following technical solution: A cold pressing mold for lightweight automotive center console sheet metal parts includes an upper pressing mold and a lower pressing mold. The lower pressing mold has a convex cross-section, and the upper pressing mold has an inverted concave cross-section. An outer groove is provided in the middle of the top surface of the lower pressing mold. An ejector cylinder is provided on the inner wall of the outer groove. The piston rod of the ejector cylinder faces upward, and the top of the ejector cylinder is used to drive the sheet metal part to detach from the lower pressing mold.

[0007] By adopting the above technical solution, an ejector cylinder is used to eject the sheet metal part, causing it to detach from the lower mold, and then the sheet metal part is removed manually. Because a mechanical ejection method is used to separate the sheet metal part from the lower mold, the direction of force is accurate, thus facilitating the removal of the sheet metal part.

[0008] Optionally, the piston rod of the ejector cylinder is provided with an ejector bracket at its top end. The ejector bracket includes a connecting frame and a bending rod. The connecting frame is fixed to the top end of the piston rod, and the bending rod is fixed to the connecting frame. The bending rod includes a U-shaped segment and straight segments at both ends of the U-shaped segment. The bending rod is bent along the same curve as the top edge of the cross-section of the lower die. The bending rod is used to abut against the sheet metal part.

[0009] By adopting the above technical solution, the sheet metal parts are ejected using an ejector bracket, and the bending rod is set to fit the shape of the sheet metal parts, so that the sheet metal parts are subjected to more uniform force when they are ejected, thereby making the sheet metal parts less prone to deformation.

[0010] Optionally, a loosening component is provided in the outer groove, the loosening component includes a reciprocating structure and two striking rods connected at both ends; the edge of the cross section of the lower die includes angle a and angle b located on the top surface of the lower die, and the two striking rods are respectively oriented towards angle a and angle b;

[0011] When the ejector bracket retracts into the outer groove, all the bending rods are located within the outer groove, and the ends of the striking rods facing corners a and b are higher than the top of the bending rods. The reciprocating structure drives the striking rods to slide back and forth, and the sliding direction of the striking rods is the direction of the line connecting corners a and b. The striking rods are used to strike the sheet metal parts near corners a and b.

[0012] By adopting the above technical solution, since the radius of the central tunnel of a lightweight car is usually 2-5mm, it is lightweight. However, after cold pressing, due to the ductility of metal, the radius is not easy to detach from the mold. If the sheet metal is forcibly ejected by mechanical ejection, it is easy to cause deformation of the sheet metal and make the product unqualified.

[0013] The striking rod is driven by a reciprocating mechanism, which causes the striking rod to move back and forth to strike the sheet metal part near corners a and b. Through vibration, the sheet metal part is first separated from the lower die, and then ejected by the ejector cylinder, making the sheet metal part less prone to deformation. The striking points are chosen near corners a and b because these are bending points with high strength, and striking these two points makes the sheet metal part less prone to deformation.

[0014] The striking rod is positioned with its ends facing corners a and b higher than the top of the bending rod, so that the striking rod strikes corners a and b first, and then the bending rod pushes the sheet metal part out.

[0015] Optionally, the reciprocating structure includes a square frame, a square plate, a first gear, and a second gear. A reciprocating straight slot is formed on the surface of the square plate. Several cylinders are evenly spaced and fixed side by side at the bottom of the reciprocating straight slot. The cylinders at two edge positions are coaxially arranged with the two ends of the reciprocating straight slot in the length direction. The first gear is located inside the reciprocating straight slot and meshes with the several cylinders. A limiting ring is provided on the edge of the reciprocating straight slot to confine the first gear within the slot.

[0016] The second gear is rotatably connected to the housing of the ejector cylinder. The piston rod sidewall of the ejector cylinder is provided with transmission teeth. The extension direction of the transmission teeth is the same as the length direction of the piston rod of the ejector cylinder. The second gear meshes with the transmission teeth. The first gear and the second gear are coaxially fixed.

[0017] The square frame is slidably disposed on the inner wall of the outer groove. The sliding direction of the square frame is the same as the direction of the line connecting angle a and angle b. The square plate is limited to sliding within the square frame. The horizontal width of the square frame is the same as the horizontal width of the square plate. The vertical height of the square frame is greater than the vertical height of the square plate.

[0018] The ends of the two striking rods away from corners a and b are fixed to the square plate.

[0019] By adopting the above technical solution, when the ejector cylinder is working, the piston rod moves, driving the second gear to rotate. The second gear then drives the first gear to rotate. Because the first gear is confined within the reciprocating straight groove and meshes with several cylinders, the rows of cylinders divide the inner cavity of the straight groove into an annular channel for the first gear to move. When the first gear rotates, it drives the square plate to move horizontally and vertically. When the square plate moves horizontally, it facilitates the sliding of the square frame, allowing the two striking rods to strike the sheet metal parts near corners a and b, respectively. When the square plate moves vertically, it moves upward within the square frame.

[0020] Optionally, the piston rod of the ejector cylinder is provided with a stop groove, which is located below the transmission teeth. The extension direction of the stop groove is the same as the extension direction of the transmission teeth, and the stop groove is used to accommodate the end of the second gear near the transmission teeth.

[0021] By adopting the above technical solution, when the piston rod of the ejector cylinder begins to move upward, the second gear meshes at the transmission teeth. At this time, the striking rod moves and strikes the sheet metal part. Subsequently, when the second gear is in the stop groove, the second gear no longer drives the first gear to rotate, so that the sheet metal part is no longer struck. After the sheet metal part is struck once at each of the positions near corner a and corner b, the striking rod stops moving, thus not affecting the ejection of the sheet metal part.

[0022] Optionally, the ends of the two striking rods facing corners a and b are provided with rubber layers.

[0023] By adopting the above technical solution, the rubber layer reduces knocking noise and also makes the sheet metal parts less susceptible to deformation from knocking.

[0024] Optionally, the connecting frame includes a fixing plate and an abutment block. The fixing plate is fixed to the end of the piston rod of the ejector cylinder, the abutment block is fixed to the fixing plate, and a bending rod is fixed to the end of the abutment block away from the ejector cylinder.

[0025] Optionally, the bending rod includes angles a' and b' that mate with angles a and b, and the abutment block is fixed to angles a' and b'.

[0026] By adopting the above technical solution, when the bending rod pushes out the sheet metal part, the segment between angle a' and angle b' of the bending rod is subjected to the greatest force, and the support at angle a' and angle b' makes the bending rod less prone to deformation.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By setting an ejector cylinder to eject the sheet metal parts for unloading, the unloading process is made more convenient, thereby improving production efficiency;

[0029] 2. By setting a hammering rod to strike the sheet metal parts before cutting them, the sheet metal parts are less likely to deform.

[0030] 3. By setting support blocks to support the bent rod, the bent rod is less prone to deformation. Attached Figure Description

[0031] Figure 1 This is an overall schematic diagram of the cold pressing mold according to an embodiment of this application.

[0032] Figure 2 This is a schematic diagram of the structure inside the outer groove of the embodiment.

[0033] Figure 3 This is a structural schematic diagram of the ejector bracket in an embodiment, mainly highlighting the structure of the ejector bracket.

[0034] Figure 4 This is a schematic diagram of the loosening component in an embodiment.

[0035] Explanation of reference numerals in the attached drawings: 1. Upper mold; 2. Lower mold; 21. Outer groove; 22. Ejection cylinder; 23. Angle a; 24. Angle b; 3. Ejection bracket; 31. Connecting frame; 311. Fixing plate; 312. Abutting block; 32. Bending rod; 321. U-shaped section; 322. Straight section; 323. Angle a'; 324. Angle b'; 4. Loosening component; 41. Reciprocating structure; 411. Square frame; 4111. Sliding cavity; 4112. Slide rail; 4113. Slide groove; 4114. Abutting ring; 412. Square plate; 4121. Reciprocating straight groove; 4122. Cylinder; 4123. Limiting ring; 413. First gear; 414. Second gear; 42. Striking rod; 5. Transmission gear; 6. Stop groove; 7. Rubber layer; 8. Sheet metal part. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0037] This application discloses a cold pressing mold for lightweight automotive center console sheet metal parts. (See also...) Figure 1 The cold pressing mold for the central tunnel sheet metal parts of lightweight automobiles includes an upper pressing mold 1 and a lower pressing mold 2. The cross-section of the lower pressing mold 2 in the length direction is "convex", and the cross-section of the upper pressing mold 1 in the length direction is "concave". The sheet metal part 8 is placed between the upper pressing mold 1 and the lower pressing mold 2 and cold pressed to form the part.

[0038] Reference Figure 1 , Figure 2 Two outer grooves 21 are formed in the middle of the top surface of the lower die 2, and the two outer grooves 21 extend through both sides of the lower die 2 in the width direction. Ejection cylinders 22 are bolted to the inner walls of the two outer grooves 21 respectively. The piston rod of the ejection cylinder 22 is vertically upward, and the top of the ejection cylinder 22 is used to drive the sheet metal part 8 to move upward and disengage from the lower die 2.

[0039] Reference Figure 1 , Figure 3 The piston rod of the ejector cylinder 22 is fixed to an ejector bracket 3 for abutting against the sheet metal part 8. The ejector bracket 3 includes a connecting frame 31 and a bending rod 32. The connecting frame 31 is fixed to the top of the piston rod. The connecting frame 31 includes a fixing plate 311 and two abutment blocks 312. The fixing plate 311 has a through hole in the middle for the piston rod of the ejector cylinder 22 to pass through. Two nuts are threaded onto the piston rod of the ejector cylinder 22 to fix the fixing plate 311. The two abutment blocks 312 are fixed to the top surface of the fixing plate 311 and are fixed to both ends of the fixing plate 311 in the length direction. The bending rod 32 is welded to the end of the abutment block 312 away from the ejector cylinder 22.

[0040] Reference Figure 1 , Figure 3The bending rod 32 includes a U-shaped segment 321 and straight segments 322 disposed at both ends of the U-shaped segment 321. The bending shape of the bending rod 32 is the same as the shape of the top edge of the cross section of the lower die 2. The bending rod 32 is used to abut against the bottom surface of the sheet metal part 8. Because the bending shape of the bending rod 32 matches the cold-pressed sheet metal part 8, the sheet metal part 8 is subjected to uniform force when it is ejected.

[0041] Reference Figure 2 , Figure 3 The edge of the cross section in the width direction of the lower die 2 includes angle a 23 and angle b 24 located on the top surface of the lower die 2. The bending rod 32 includes angle a' 323 and angle b' 324 that fit with angle a 23 and angle b 24. The top ends of the two abutting blocks 312 are welded and fixed to angle a' 323 and angle b' 324 respectively.

[0042] Reference Figure 2 , Figure 3 The outer groove 21 is also provided with a loosening component 4, which includes a reciprocating structure 41 and two striking rods 42 connected at both ends. The ends of the two striking rods 42 that are far apart from each other are directed toward angle a 23 and angle b 24, respectively. The reciprocating structure 41 drives the striking rods 42 to slide horizontally so that the ends of the striking rods 42 alternately strike the sheet metal part 8 near angle a 23 and angle b 24.

[0043] Reference Figure 2 , Figure 3 When the ejector bracket 3 retracts into the outer groove 21 via the ejector cylinder 22, the bending rod 32 is entirely located within the outer groove 21, with the top of the bending rod 32 lower than the top surface of the lower die 2, and the ends of the striking rod 42 facing angles a23 and b24 higher than the top of the bending rod 32. The reciprocating structure 41 drives the striking rod 42 to slide horizontally back and forth, with the sliding direction along the width direction of the lower die 2, and the sliding direction of the striking rod 42 is also the direction of the line connecting angles a23 and b24.

[0044] Reference Figure 2 , Figure 4 The reciprocating structure 41 includes a frame 411, a square plate 412, a first gear 413, and a second gear 414. The plane of the frame 411 is parallel to the side wall of the outer groove 21. A sliding cavity 4111 for sliding the square plate 412 is formed through the side wall of the frame 411 facing the inner wall of the outer groove 21. The depth direction of the sliding cavity 4111 is parallel to the length direction of the lower die 2. The frame 411 is slidably connected to the inner wall of the outer groove 21. A slide rail 4112 with the same length direction as the line connecting angle a23 and angle b24 is fixed on the inner wall of the outer groove 21. A groove 4113 for accommodating the slide rail 4112 is formed on the frame 411. The inner wall of the groove 4113 is in sliding contact with the outer wall of the slide rail 4112.

[0045] Reference Figure 2 , Figure 4 A square plate 412 is slidably connected within a sliding cavity 4111. The horizontal width of the square frame 411 is the same as the horizontal width of the square plate 412, while the vertical height of the square frame 411 is greater than the vertical height of the square plate 412. The sliding direction of the square plate 412 is along the plane containing the square frame 411. An abutment ring 4114 is fixed to the inner wall of the sliding cavity 4111, located on the side of the sliding cavity 4111 closest to the slide rail 4112, and extending circumferentially along the inner wall of the sliding cavity 4111. When the square plate 412 slides, it abuts against the side of the abutment ring 4114 away from the slide rail 4112. The ends of two striking rods 42 away from angles a23 and b24 are fixed to the square plate 412. When the square plate 412 slides, it drives the two striking rods 42 to slide. The striking rods 42 are hollow rods, characterized by their lightweight nature.

[0046] Reference Figure 4 A reciprocating straight groove 4121 is formed on the surface of the square plate 412 away from the slide rail 4112. Several cylinders 4122 are evenly spaced and fixed side-by-side on the bottom of the groove 4121. Two cylinders 4122 at the edges are coaxially arranged with the two ends of the reciprocating straight groove 4121 along its length. A first gear 413 is located within the reciprocating straight groove 4121, with its axis parallel to the axes of the cylinders 4122, and meshes with the cylinders 4122. A limiting ring 4123 is provided along the edge of the groove 4121 to confine the first gear 413 within the groove.

[0047] Reference Figure 4 The second gear 414 is rotatably connected to the housing of the ejector cylinder 22. The piston rod side wall of the ejector cylinder 22 is provided with a transmission tooth 5. The extension direction of the transmission tooth 5 is the same as the length direction of the piston rod of the ejector cylinder 22. The second gear 414 meshes with the transmission tooth 5. The first gear 413 and the second gear 414 are coaxially fixed.

[0048] Reference Figure 4 The piston rod of the ejector cylinder 22 is provided with a stop groove 6. The stop groove 6 is located below the transmission gear 5. The extension direction of the stop groove 6 is the same as the extension direction of the transmission gear 5. The stop groove 6 is used to accommodate the end of the second gear 414 near the transmission gear 5. When the second gear 414 disengages from the transmission gear 5 and enters the stop groove 6, the second gear 414 stops rotating, causing the two striking rods 42 to stop striking.

[0049] Reference Figure 2 , Figure 4 A rubber layer 7 is fixed on the ends of the two striking rods 42 facing angle a 23 and angle b 24. The rubber layer 7 is a rubber sleeve, which is fitted onto the ends of the striking rods 42. The friction of the inner wall of the rubber sleeve fixes the rubber sleeve to the ends of the striking rods 42.

[0050] The implementation principle of a cold pressing mold for a lightweight automotive central tunnel sheet metal part in this application embodiment is as follows: In use, a 2-5mm sheet metal part 8 is pressed by closing the upper mold 1 and the lower mold 2. After pressing, the piston rod of the ejector cylinder 22 rises, driving the second gear 414 to rotate, and then driving the first gear 413 to rotate. Rows of cylinders 4122 divide the straight groove into annular channels for the first gear 413 to move. When the first gear 413 moves in the channel, it drives the square plate 412 to move. When the first gear 413 moves horizontally within the channel, the square plate 412 and the square frame 411 move horizontally along the slide rail 4112, causing the striking rod 42 to move horizontally, thereby striking the sheet metal part 8 near the positions of corner a 23 and corner b 24; when the first gear 413 moves from the lower channel to the upper channel, the square plate 412 moves upward within the square frame 411, because the vertical height of the inner cavity of the square frame 411 is greater than the height of the square plate 412, thus reserving space for the square plate 412 to slide.

[0051] In summary, the technical solution of this application first uses vibration to loosen the sheet metal part 8 from the lower die 2, then ejects the sheet metal part 8 through the ejector cylinder 22, and then the worker removes the sheet metal part 8 from the bending rod 32. This makes it easy to unload the sheet metal part 8, and the sheet metal part 8 is not easily deformed, improving the processing efficiency of the sheet metal part 8 and resulting in a good product shape.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A cold pressing die for a lightweight automotive center console sheet metal part, comprising an upper die (1) and a lower die (2), characterized in that: The lower die (2) has a convex cross section, and the upper die (1) has an inverted concave cross section. An outer groove (21) is provided in the middle of the top surface of the lower die (2). An ejector cylinder (22) is provided on the inner wall of the outer groove (21). The piston rod of the ejector cylinder (22) faces upward. The top of the ejector cylinder (22) is used to drive the sheet metal part (8) to detach from the lower die (2). The piston rod of the ejector cylinder (22) is provided with an ejector bracket (3) at the top. The ejector bracket (3) includes a connecting frame (31) and a bending rod (32). The connecting frame (31) is fixed to the top of the piston rod, and the bending rod (32) is fixed to the connecting frame (31). The bending rod (32) includes a U-shaped section (321) and straight sections (322) at both ends of the U-shaped section (321). The bending shape of the bending rod (32) is the same as the shape of the top edge of the cross section of the lower die (2). The bending rod (32) is used to abut against the sheet metal part (8). A loosening component (4) is provided inside the outer groove (21). The loosening component (4) includes a reciprocating structure (41) and two striking rods (42) connected at both ends. The edge of the cross section of the lower die (2) includes angle a (23) and angle b (24) located on the top surface of the lower die (2). The two striking rods (42) are respectively oriented towards angle a (23) and angle b (24). When the ejector bracket (3) retracts into the outer groove (21), the bending rod (32) is completely located in the outer groove (21), and the end of the striking rod (42) facing angle a (23) and angle b (24) is higher than the top of the bending rod (32). The reciprocating structure (41) drives the striking rod (42) to slide back and forth. The sliding direction of the striking rod (42) is the direction of the line connecting angle a (23) and angle b (24). The striking rod (42) is used to strike the sheet metal part (8) near angle a (23) and angle b (24).

2. The cold pressing mold for a lightweight automotive center console sheet metal part according to claim 1, characterized in that: The reciprocating structure (41) includes a square frame (411), a square plate (412), a first gear (413), and a second gear (414). The square plate (412) has a reciprocating straight slot (4121) on its surface. Several cylinders (4122) are evenly spaced and fixed side by side at the bottom of the reciprocating straight slot (4121). The cylinders (4122) at the two edge positions are coaxially arranged with the two ends of the reciprocating straight slot (4121) in the length direction. The first gear (413) is located in the reciprocating straight slot (4121) and meshes with several cylinders (4122). The edge of the reciprocating straight slot (4121) is provided with a limiting ring (4123) that limits the first gear (413) to be located in the straight slot. The second gear (414) is rotatably connected to the housing of the ejector cylinder (22). The piston rod sidewall of the ejector cylinder (22) is provided with a transmission tooth (5). The extension direction of the transmission tooth (5) is the same as the length direction of the piston rod of the ejector cylinder (22). The second gear (414) meshes with the transmission tooth (5). The first gear (413) and the second gear (414) are coaxially fixed. The frame (411) is slidably disposed on the inner wall of the outer groove (21). The sliding direction of the frame (411) is the same as the direction of the line connecting angle a (23) and angle b (24). The square plate (412) is limited to sliding within the frame (411). The horizontal width of the frame (411) is the same as the horizontal width of the square plate (412). The vertical height of the frame (411) is greater than the vertical height of the square plate (412). The ends of the two striking rods (42) away from angle a (23) and angle b (24) are fixed to the square plate (412).

3. The cold pressing mold for a lightweight automotive center console sheet metal part according to claim 2, characterized in that: The piston rod of the ejector cylinder (22) is provided with a stop groove (6), which is located below the transmission gear (5). The extension direction of the stop groove (6) is the same as the extension direction of the transmission gear (5). The stop groove (6) is used to accommodate the end of the second gear (414) near the transmission gear (5).

4. The cold pressing mold for a lightweight automotive center console sheet metal part according to claim 2, characterized in that: The two striking rods (42) are provided with rubber layers (7) at their ends facing angle a (23) and angle b (24).

5. The cold pressing mold for a lightweight automotive center console sheet metal part according to claim 1, characterized in that: The connecting frame (31) includes a fixing plate (311) and an abutment block (312). The fixing plate (311) is fixed to the piston rod end of the ejector cylinder (22). The abutment block (312) is fixed on the fixing plate (311). A bending rod (32) is fixed to the end of the abutment block (312) away from the ejector cylinder (22).

6. A cold pressing mold for a lightweight automotive center console sheet metal part according to claim 5, characterized in that: The bending rod (32) includes an a' angle (323) and a' angle (324) that fit with an a' angle (23) and a b' angle (24), and the abutment block (312) is fixed to the a' angle (323) and the b' angle (324).

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