Long cantilever bending die for progressive die

Abstract

The utility model belongs to the technical field of metal stamping, and relates to a long cantilever bending die for a progressive die, which comprises an upper die and a lower die, the upper die comprises a bending punch, and the lower die comprises a fixed support block, a floating positioning block, an inclined stripping forming block, a plurality of first elastic reset pieces and a plurality of second elastic reset pieces. The first elastic reset piece is located below the floating positioning block and enables the floating positioning block to reset upwards, the second elastic reset piece is located below the inclined stripping forming block and enables the inclined stripping forming block to reset upwards, and an inclined guide part in sliding fit with the inclined stripping forming block is arranged at the position, close to the bending punch, of the floating positioning block fixing supporting block. The inclined stripping forming block is closer to the floating positioning block when the inclined stripping forming block is higher. The die can spontaneously descend and get close to the bending position in the die assembly process through the inclined stripping forming block, so that the bending punch is assisted to complete bending of a large flat plate part, the upper die does not need other parts to drive the inclined stripping forming block to move, and the continuous stamping process for manufacturing the rear support of the safety air bag through double-row layout can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of metal stamping, in particular to a long cantilever bending die for a continuous die. Background Art

[0002] like Figure 1 As shown, the airbag rear bracket 1 is a multi-angle bending part, and its overall structure is like a curled hand, including a panel part 11, a first bending part 12, two second bending parts 13 and an L-shaped bending part 14 connected in sequence, there is an angle between the panel part 11 and the first bending part 12, there is an angle between the first bending part 12 and the second bending part 13, and there is also an angle between the second bending part 13 and the L-shaped bending part 14. The panel part 11 is provided with a plurality of through holes 111, and the first bending part 12 is provided with a plurality of reinforcing ribs 121 extending from the panel part 11 to the second bending part 13.

[0003] When manufacturing this type of airbag, the order of the rear bracket 1 is to first extrude the reinforcing ribs 121, then punch out the through holes 111, and then bend from the L-shaped bend portion 14 to the first bend portion 12 in sequence. In order to facilitate manufacturing and save materials, the manufacturing process adopts a double-row straight-line non-overlapping pattern arrangement, that is, the connecting belt is located in the middle, and the forming areas are respectively manufactured on both sides. The panel portion 11 is kept at the same height as the connecting belt, and the connection positions of the forming areas on both sides and the connecting belt are staggered. Because the panel portion 11 can remain horizontal, the L-shaped bend portion 14, the second bend portion 13 and the first bend portion 12 can be formed in sequence through multiple bends. However, two difficulties arise in actual processing:

[0004] ① The conveying direction of the material belt is the front-to-back direction, and the bending direction is the left-to-right direction. Here, it is necessary to consider the avoidance problem before and after the material deformation. Therefore, the bending step between the first bending part 12 and the second bending part 13 needs to rely on the left and right side pushing structures to limit the lower part of the corner. However, the layout of the material belt makes it impossible to pass through the connecting belt to drive the translation of the side pushing structure.

[0005] ② The Chinese patent CN220880021U applied by our company discloses a reverse side punch die for a continuous die, which adopts a side push structure driven in reverse from the outside of the material strip to limit the lower part of the corner. However, because the L-shaped bending portion 14 already exists on the outside of the second bending portion 13, in order to avoid the swing of the L-shaped bending portion 14 and the second bending portion 13 during bending, the reverse side punch structure cannot be set.

[0006] Therefore, it is necessary to provide a new mold structure to solve the above problems. Summary of the invention

[0007] The main purpose of the utility model is to provide a long cantilever bending die for a continuous die, which can assist the bending punch to complete the bending of a large flat plate portion. The upper die does not need other components to drive the oblique stripping forming block to move, so that the continuous stamping process of double-row pattern making of the rear bracket of the airbag can be realized.

[0008] The utility model achieves the above-mentioned purpose through the following technical solutions: a long cantilever bending die for a continuous die, used to bend a blank, the blank comprising a large flat portion connected to a material strip connection area and a semi-suspended L-shaped bending portion, the large flat portion is bent downward at a position close to the L-shaped bending portion to form a second bending portion, the unbent portion of the large flat portion is formed into a small flat portion, and the small flat portion has a plurality of through holes and a plurality of reinforcing ribs within the range;

[0009] It comprises an upper die and a lower die, wherein the upper die comprises a bending punch, and the lower die comprises a fixed support block, a floating positioning block, an oblique release forming block, a plurality of first elastic reset members, and a plurality of second elastic reset members;

[0010] The floating positioning block is embedded in the fixed support block, and the first elastic reset member is located below the floating positioning block and resets the floating positioning block upward;

[0011] The fixed support block is provided with an oblique guide portion slidingly matched with the oblique release forming block at a position close to the bending punch. The second elastic reset member is located below the oblique release forming block and resets the oblique release forming block obliquely upward. The higher the position of the oblique release forming block, the closer it is to the floating positioning block.

[0012] Specifically, a plurality of positioning protrusions are provided on the upper surface of the floating positioning block, and the positioning protrusions correspond to the through holes one by one.

[0013] Specifically, the upper die is provided with a limit block on both sides above the oblique release forming block, and the two limit blocks are respectively located at the front and rear sides of the blank when the die is closed.

[0014] Specifically, a plurality of reinforcing rib avoidance grooves are provided on the upper surface of the oblique release forming block, and the reinforcing rib avoidance grooves correspond to the reinforcing ribs one by one.

[0015] The beneficial effects of the technical solution of the utility model are:

[0016] The die can spontaneously descend and approach the bending position during the die closing process through the oblique stripping forming block, thereby assisting the bending punch to complete the bending of the large flat plate portion. The upper die does not need other components to drive the oblique stripping forming block to move, so that the continuous stamping process of double-row pattern manufacturing of the airbag rear bracket can be realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1This is a diagram showing the molding changes of the rear bracket of the airbag;

[0018] Figure 2 This is a position relationship diagram of the main components of the long cantilever bending mold of the embodiment when the mold is opened;

[0019] Figure 3 This is a diagram showing the position relationship between the main components of the long cantilever bending mold and the local part of the material strip when the mold is closed.

[0020] The numbers in the figure represent:

[0021] 1-airbag rear bracket, 11-panel portion, 111-through hole, 12-first bending portion, 121-reinforcement rib, 13-second bending portion, 14-L-shaped bending portion, 15-large flat plate portion, 16-small flat plate portion;

[0022] 2-material strip, 21-connection area, 22-blank;

[0023] 3-long cantilever bending die, 311-bending punch, 312-limiting block, 321-fixed supporting block, 3211-oblique guiding part, 322-floating positioning block, 3221-positioning protrusion, 323-oblique release forming block, 3231-reinforcement rib avoidance groove, 324-first elastic reset part, 325-second elastic reset part. DETAILED DESCRIPTION

[0024] The utility model is further described in detail below in conjunction with specific embodiments.

[0025] Example:

[0026] like Figure 1 and Figure 3 As shown, the blank 22 includes a large flat portion 15 connected to the connecting area 21 of the material strip 2 and a semi-suspended L-shaped bending portion 14. The large flat portion 15 is bent downward to form a second bending portion 13 near the L-shaped bending portion 14, and the unbent portion of the large flat portion 15 is formed into a small flat portion 16. The small flat portion 16 has a plurality of through holes 111 and a plurality of reinforcing ribs 121 within its range.

[0027] like Figures 1 to 3As shown, the utility model is a long cantilever bending die 3 for a continuous die, which is used to bend a blank 22, and includes an upper die and a lower die, the upper die includes a bending punch 311, and the lower die includes a fixed support block 321, a floating positioning block 322, an oblique release forming block 323, a plurality of first elastic reset members 324 and a plurality of second elastic reset members 325; the floating positioning block 322 is embedded in the fixed support block 321, the first elastic reset member 324 is located below the floating positioning block 322 and resets the floating positioning block 322 upward; the fixed support block 321 is provided with an oblique guide portion 3211 that slidably cooperates with the oblique release forming block 323 at a position close to the bending punch 311, the second elastic reset member 325 is located below the oblique release forming block 323 and resets the oblique release forming block 323 obliquely upward, and the higher the position of the oblique release forming block 323 is, the closer it is to the floating positioning block 322.

[0028] Before mold closing, the oblique release forming block 323 and the floating positioning block 322 are respectively raised to provide two support areas for the blank 22. At this time, the oblique release forming block 323 is far away from the L-shaped bending portion 14, so it will not affect the translation of the L-shaped bending portion 14; when the mold is closed, the blank 22 stays between the upper and lower molds, the upper mold pushes the blank 22 down, and the blank 22 pushes the oblique release forming block 323 and the floating positioning block 322 down, because the oblique release forming block 323 and the oblique guide portion 3211 are The oblique fitting relationship means that the oblique stripping forming block 323 will gradually move to the side close to the bending punch 311. When the upper surface of the oblique stripping forming block 323, the upper surface of the floating positioning block 322 and the upper surface of the fixed support block 321 are all flush, the blank 22 is pressed by the upper die. When the die is closed continuously, the bending punch 311 hits the upper surface of the blank 22 relative to the oblique stripping forming block 323, so that the large flat plate portion 15 becomes a small flat plate portion 16 and a second bending portion 13 with an obtuse angle. Because the upper die here causes the oblique stripping forming block 323 to descend obliquely through the blank 22, the connection area 21 and the L-shaped bending portion 14 will not affect the action of the side push support. The upper die does not need other components to drive the oblique stripping forming block 323 to move, so that the continuous stamping process of manufacturing the rear airbag bracket 1 with double-row pattern can be realized.

[0029] like Figure 2 and Figure 3 As shown, a plurality of positioning protrusions 3221 are provided on the upper surface of the floating positioning block 322 , and the positioning protrusions 3221 correspond to the through holes 111 one by one.

[0030] The large flat plate portion 15 is actually a preformed portion of the panel portion 11, the first bend portion 12, and the second bend portion 13, so the through hole 111 on the panel portion 11 and the reinforcing rib 121 on the first bend portion 12 are also within the range of the large flat plate portion 15. In continuous stamping, the connection area 21 usually has a positioning hole for positioning the strip, but in the case of bending, the floating positioning block 322 will first pass through the through hole 111 with the positioning protrusion 3221, and then generate a lateral pulling force on a part of the blank 22. In the process of continuing to close the mold, friction and pulling force are both used to counteract the pulling force, preventing the material from being pulled off, and ensuring the structural accuracy of the product.

[0031] like Figure 2 and Figure 3 As shown, the upper mold is provided with a limit block 312 on both sides above the oblique release forming block 323. When the mold is closed, the two limit blocks 312 are respectively located at the front and rear sides of the blank 22.

[0032] When the upper die is pressed down, the two sides of the blank 22 will be limited by the two limit blocks 312, so that the relative position of the blank 22 and the bending punch 311 will not be too much cheaper, and the final position of the bending line will be more accurate.

[0033] like Figure 2 and Figure 3 As shown, the upper surface of the oblique release forming block 323 is provided with a plurality of reinforcing rib avoidance grooves 3231 , and the reinforcing rib avoidance grooves 3231 correspond to the reinforcing ribs 121 one by one.

[0034] During the upstream stamping, the reinforcing rib 121 will be pre-formed on the upper side of the large flat plate portion 15, and the reinforcing rib 121 will present a plurality of parallel concave thin convex bulges. The oblique release forming block 323 needs to be as close to the lower plane of the large flat plate portion 15 as possible, and the reinforcing rib 121 cannot be flattened, so a reinforcing rib avoidance groove 3231 needs to be provided to prevent the reinforcing rib 121 from being stressed during the mold closing.

[0035] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A long cantilever bending die for a continuous die, used for bending a blank, the blank comprising a large flat portion connected to a material strip connection area and a semi-suspended L-shaped bending portion, the large flat portion being bent downward to form a second bending portion at a position close to the L-shaped bending portion, the unbent portion of the large flat portion being formed into a small flat portion, the small flat portion having a plurality of through holes and a plurality of reinforcing ribs within its range; characterized in that: It comprises an upper die and a lower die, wherein the upper die comprises a bending punch, and the lower die comprises a fixed support block, a floating positioning block, an oblique release forming block, a plurality of first elastic reset members, and a plurality of second elastic reset members; The floating positioning block is embedded in the fixed support block, and the first elastic reset member is located below the floating positioning block and resets the floating positioning block upward; The fixed support block is provided with an oblique guide portion slidingly matched with the oblique release forming block at a position close to the bending punch. The second elastic reset member is located below the oblique release forming block and resets the oblique release forming block obliquely upward. The higher the position of the oblique release forming block, the closer it is to the floating positioning block.

2. The long cantilever bending die for a continuous die according to claim 1, characterized in that: The upper surface of the floating positioning block is provided with a plurality of positioning protrusions, and the positioning protrusions correspond to the through holes one by one.

3. The long cantilever bending die for a continuous die according to claim 1, characterized in that: The upper die is provided with a limit block on both sides above the oblique release forming block. When the die is closed, the two limit blocks are respectively located at the front and rear sides of the blank.

4. The long cantilever bending die for a continuous die according to claim 1, characterized in that: The upper surface of the oblique release forming block is provided with a plurality of reinforcing rib avoidance grooves, and the reinforcing rib avoidance grooves correspond to the reinforcing ribs one by one.

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