Die opening reset time-delay structure of drawing die

Abstract

The utility model relates to the technical field of stamping dies, and discloses a drawing die opening reset delay structure, which is characterized in that locking blocks are arranged on a lower die holder and are positioned at two ends of a lower pressure plate, sliding blocks capable of alternately moving between a first position and a second position are arranged on the locking blocks, and when the sliding blocks are positioned at the first position, the locking blocks are locked; the sliding block extends out of the surface of the locking block and limits the end of the lower material pressing plate so as to prevent the lower material pressing plate from pressing the lower side face of the material piece. When the sliding block is located at the second position, the sliding block retracts into the locking block so as to relieve blocking to the lower material pressing plate; the upper die base is provided with a slotting tool extending to the lower die base, and the slotting tool is used for driving the sliding block to be switched to the second position from the first position after the upper die base is away from the lower die base by a set distance. According to the die opening reset delay structure of the drawing die, through the stable die structure, in the die opening process after drawing forming is finished, the upper material pressing plate is reset immediately, and the lower material pressing plate is delayed to reset, so that the combined action of the upper material pressing plate and the lower material pressing plate is avoided, and secondary deformation of a product in the production process is avoided.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, and in particular to a delay structure for opening and resetting a stretching die. Background Technology

[0002] In stretching dies, there are often situations where both the upper and lower dies have pressure structures. When the stretching process ends and the die is opened, if the upper die pressure plate has not completely detached from the lower die, the lower die pressure plate will begin to reset. Under the combined action of the upper and lower die pressure plates, the already formed product will undergo secondary deformation, which seriously affects the product quality.

[0003] Existing stretching die structures such as Figure 1 As shown, when the upper die moves downward, the upper die pressure plate 1' presses the material under the action of the upper die nitrogen spring 2'. Then, the upper die forming block 3' begins to work, starting the stretching process under the action of the lower die pressure plate 4', until the lower die pressure plate 4' and the stop block 6' come into contact. When the mold opens, the upper die begins to move upward. In the initial stage, the upper die pressure plate 1' remains stationary under the action of the upper die nitrogen spring 2'. As the upper die forming block 3' moves upward, the lower die pressure plate 4' moves upward simultaneously under the action of the lower die nitrogen spring 5'. At this time, the stretched product is simultaneously subjected to the downward force of the upper die pressure plate 1' and the upward force of the lower die pressure plate 4'. If the stretched material is relatively thin, the formed product will undergo secondary deformation, failing to meet product quality requirements.

[0004] To address this, the lower die pressure plate 4' needs to be able to delay its reset during mold opening to avoid secondary deformation and damage to the already formed product. Utility Model Content

[0005] Based on the above problems, the purpose of this utility model is to provide a delay structure for opening and resetting a stretching die, so that the lower die pressure plate can be reset with a delay.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A delay structure for opening and resetting a stretching die is provided. The stretching die includes an upper die base, a lower die base, an upper forming block, a lower forming block, an upper pressure plate, and a lower pressure plate. The upper forming block is disposed on the upper die base, and the lower forming block is disposed on the lower die base. The upper forming block and the lower forming block cooperate to stretch a sheet. An upper nitrogen spring is provided on the upper die base to drive the upper pressure plate to press against the upper side of the sheet, and a lower nitrogen spring is provided on the lower die base to drive the lower pressure plate to press against the lower side of the sheet.

[0008] Among them, locking blocks are provided on the lower die base and at both ends of the lower pressure plate. The locking blocks are provided with sliders that can move alternately between a first position and a second position. When the slider is in the first position, the slider extends out of the surface of the locking block and limits the end of the lower pressure plate to prevent the lower pressure plate from pressing against the lower side of the material sheet. When the slider is in the second position, the slider retracts into the locking block to release the obstruction to the lower pressure plate.

[0009] The upper mold base is provided with a cutter that extends to the lower mold base. The cutter is used to drive the slider to switch from the first position to the second position after the upper mold base moves away from the lower mold base by a set distance.

[0010] As an alternative, the lower end of the inserter is provided with a protrusion, and the slider is provided with a through hole for inserting the inserter, and the through hole is provided with a raised edge. The raised edge engages with the protrusion, so that the vertical movement of the inserter is converted into the horizontal movement of the slider.

[0011] As an optional solution, a return spring is provided on the locking block, which is used to drive the slider to remain in the first position.

[0012] As an alternative, the lock block is provided with a cavity for mounting the slider, one end of the cavity is provided with a spring baffle for mounting the reset spring, and the other end of the cavity is provided with a stop block to limit the extension of the slider.

[0013] As an optional solution, the distance from the protrusion edge to the protrusion during mold closing is the set distance.

[0014] As an alternative, a limit block is provided at the upper edge of the end of the lower pressure plate, and the limit block abuts against the slider for limitation.

[0015] As an alternative, a guide slope is provided at the lower edge of the end of the pressure plate, which allows the slider to automatically retract into the locking block during the mold closing process.

[0016] As an alternative, a tool holder is provided on the upper mold base, and the upper end of the insert tool is fixed to the tool holder by a locking block.

[0017] The beneficial effects of this utility model are:

[0018] The opening and resetting delay structure of this stretching die ensures that the upper pressure plate immediately resets during the opening process after stretching, while the lower pressure plate resets with a delay. This avoids the upper and lower pressure plates working together, preventing secondary deformation of the product during production and thus improving product quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an existing stretching die;

[0020] Figure 2 This is a schematic diagram of the product before stretching;

[0021] Figure 3 This is a schematic diagram of the product after it has been stretched.

[0022] Figure 4 This is a schematic diagram of the opening and resetting delay structure of the stretching die provided in this embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the locking block in the mold opening and reset delay structure of the stretching mold provided in this embodiment of the utility model.

[0024] In the attached image:

[0025] 1' Upper mold pressure plate; 2' Upper mold nitrogen spring; 3' Upper mold forming block; 4' Lower mold pressure plate; 5' Lower mold nitrogen spring; 6' Fixed block;

[0026] 1. Upper mold base; 2. Lower mold base; 3. Upper forming block; 4. Lower forming block; 5. Upper pressure plate; 6. Lower pressure plate; 7. Upper nitrogen spring; 8. Lower nitrogen spring; 9. Locking block; 10. Slider; 11. Inserting knife; 12. Protrusion; 13. Through hole; 14. Protruding edge; 15. Return spring; 16. Cavity; 17. Spring baffle; 18. Stop block; 19. Limiting block; 20. Guide slope; 21. Knife holder; 22. Locking block. Detailed Implementation

[0027] 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 present 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, not the entire structure.

[0028] In the description of this utility model, 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 utility model based on the specific circumstances.

[0029] 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.

[0030] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to 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 this utility model.

[0031] Furthermore, the terms "first" and "second" are merely used to distinguish between different terms in description and do not have any special meaning.

[0032] In response to Figure 2 The product is stretched and processed into Figure 3 Regarding the shape and working conditions, this embodiment provides a delay structure for the opening and resetting of a stretching die. Please refer to [link / reference]. Figures 4 to 5 As shown, the stretching die includes an upper die base 1, a lower die base 2, an upper forming block 3, a lower forming block 4, an upper pressure plate 5, and a lower pressure plate 6. The upper forming block 3 is disposed on the upper die base 1, and the lower forming block 4 is disposed on the lower die base 2. The upper forming block 3 and the lower forming block 4 cooperate to stretch the sheet material. The upper die base 1 is provided with an upper nitrogen spring 7 that drives the upper pressure plate 5 to press against the upper side of the sheet material, and the lower die base 2 is provided with a lower nitrogen spring 8 that drives the lower pressure plate 6 to press against the lower side of the sheet material.

[0033] Locking blocks 9 are provided on the lower mold base 2 at both ends of the lower pressure plate 6. A slider 10 is provided on the locking block 9, which can move alternately between a first position and a second position. When the slider 10 is in the first position, the slider 10 extends out of the surface of the locking block 9 and limits the end of the lower pressure plate 6 to prevent the lower pressure plate 6 from pressing against the lower side of the material sheet. When the slider 10 is in the second position, the slider 10 retracts into the locking block 9 to release the obstruction to the lower pressure plate 6.

[0034] The upper mold base 1 is provided with a cutter 11 extending to the lower mold base 2. The cutter 11 is used to drive the slider 10 to switch from the first position to the second position after the upper mold base 1 leaves the lower mold base 2 by a set distance.

[0035] Therefore, through a stable mold structure, the upper pressure plate 5 immediately resets during the mold opening process after stretching and forming, while the lower pressure plate 6 resets with a delay. This avoids the upper pressure plate 5 and the lower pressure plate 6 working together, preventing secondary deformation of the product during production and thus improving product quality.

[0036] Optionally, the lower end of the inserter 11 is provided with a protrusion 12, and the slider 10 is provided with a through hole 13 for inserting the inserter 11, and the through hole 13 is provided with a protruding edge 14. The protruding edge 14 and the protrusion 12 are in contact, so that the vertical movement of the inserter 11 is converted into the horizontal movement of the slider 10.

[0037] Thus, the sliding block 10 is driven by the insert 11 to achieve the delayed reset of the lower pressure plate 6.

[0038] Optionally, a reset spring 15 is provided on the locking block 9, which is used to drive the slider 10 to remain in the first position.

[0039] Thus, through the force of the reset spring 15, the slider 10 is always in the first position when it is not driven by the inserter 11, thereby realizing the limiting function of the slider 10 on the lower pressure plate 6.

[0040] Furthermore, the locking block 9 is provided with a cavity 16 for mounting the slider 10. One end of the cavity 16 is provided with a spring baffle 17 for mounting the reset spring 15, and the other end of the cavity 16 is provided with a stop 18 for limiting the extension of the slider 10. This ensures that the slider 10 can only switch between the first position and the second position within the cavity 16, thus guaranteeing structural stability.

[0041] The distance from the protrusion 14 to the protrusion 12 during mold closing is the set distance, and the reserved set distance enables the delayed reset of the lower pressure plate 6.

[0042] Optionally, a limit block 19 is provided at the upper edge of the end of the lower pressure plate 6, and the limit block 19 abuts against the slider 10 for limitation.

[0043] Therefore, through the precise cooperation between the limiting block 19 and the slider 10, the contact damage of the lower pressure plate 6 is reduced, and the limiting function of the slider 10 on the lower pressure plate 6 is guaranteed to be reliable.

[0044] Optionally, a guide slope 20 is provided at the lower edge of the end of the lower pressure plate 6, which allows the slider 10 to automatically retract into the locking block 9 during the mold closing process.

[0045] Therefore, during mold closing, the guide slope 20 allows the slider 10 to be smoothly pressed back into the locking block 9 during the mold closing process, without affecting normal mold closing and stretching molding, and reducing mechanical wear.

[0046] Optionally, a tool holder 21 is provided on the upper mold base 1, and the upper end of the insert tool 11 is fixed on the tool holder 21 by a locking block 22.

[0047] Thus, the drive mechanism is composed of the insert 11, locking block 22, tool holder 21, and upper mold holder 1. The punch press enables the drive mechanism to move up and down, and the insert 11 completes the position switching of the slider 10 in the locking block 9.

[0048] Specific work process:

[0049] 1) When the mold is open, the lower pressure plate 6 is located above the locking block 9, and the inserter 11 is disengaged from the lower mold base 2, the locking block 9 and the slider 10;

[0050] 2) During the mold closing process, as the upper mold base 1 moves downward, the inserter 11 enters the locking block 9; the upper mold base 1 continues to move downward, and after the upper pressure plate 5 presses down on the material sheet, the upper forming block 3 begins to cooperate with the lower forming block 4 to form; the lower pressure plate 6 begins to move downward under the action of the upper forming block 3, and the guide slope 20 of the lower pressure plate 6 contacts the slope of the slider 10. The slider 10 begins to retreat under the pressure of the lower pressure plate 6 to avoid the lower pressure plate 6; until the lower pressure plate 6 and the lower mold base 2 are locked, the lower pressure plate 6 is located below the locking block 9, and the slider 10 returns to its position under the action of the return spring 15. The slider 10 fits with the limit block 19 to form a limit.

[0051] 3) During the mold opening process after molding, the upper mold base 1 begins to rise, the inserter 11 begins to move upward, and the upper pressure plate 5 gradually separates from the lower mold base 2. After the mold opening is set, the protrusion 12 of the inserter 11 contacts the protruding edge 14 of the slider 10. Under pressure, the slider 10 begins to retract until the slider 10 and the limiting block 19 separate. The lower pressure plate 6 is reset upward under the action of the lower nitrogen spring 8, returning to the initial position and completing the delayed action relative to the upper pressure plate 5. At this point, the stretching process is completely finished.

[0052] In summary, the opening and resetting delay structure of this stretching die has the following advantages:

[0053] 1) When stretching thin materials, it can improve product quality and maintain product stability during the production process;

[0054] 2) The simple wedge structure not only ensures the functionality of the delayed lower pressure plate 6 to reset, but also simplifies the mold structure, making mold assembly simple and improving the stability of mold production.

[0055] 3) Mold manufacturing and maintenance are convenient and cost-effective.

[0056] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. 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 this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A stretch die opening reset delay structure, the stretch die comprising an upper die base (1), a lower die base (2), an upper forming block (3), a lower forming block (4), an upper pressure plate (5) and a lower pressure plate (6), the upper forming block (3) being arranged on the upper die base (1), the lower forming block (4) being arranged on the lower die base (2), the upper forming block (3) and the lower forming block (4) cooperating to stretch a material sheet, the upper die base (1) being provided with an upper nitrogen spring (7) driving the upper pressure plate (5) to press against the upper side of the material sheet, the lower die base (2) being provided with a lower nitrogen spring (8) driving the lower pressure plate (6) to press against the lower side of the material sheet; characterized in that the lower die base (2) being provided with a locking block (9) at both ends of the lower pressure plate (6), the locking block (9) being provided with a slider (10) capable of moving between a first position and a second position alternately, the slider (10) extending out of the surface of the locking block (9) and limiting the end of the lower pressure plate (6) when the slider (10) is in the first position, so as to block the lower pressure plate (6) from pressing against the lower side of the material sheet; the slider (10) being retracted into the locking block (9) when the slider (10) is in the second position, so as to release the blockage of the lower pressure plate (6); the upper die base (1) being provided with an insert knife (11) extending towards the lower die base (2), the insert knife (11) being used to drive the slider (10) to switch from the first position to the second position after the upper die base (1) is separated from the lower die base (2) by a certain distance.

2. The stretch-die open reset delay structure of claim 1, wherein, the lower end of the insert knife (11) being provided with a protrusion (12), the slider (10) being provided with a through hole (13) for the insert knife (11) to insert into, and the through hole (13) being provided with a convex edge (14), the convex edge (14) being in contact with the protrusion (12) to convert the vertical movement of the insert knife (11) into the horizontal movement of the slider (10).

3. The stretch-die open reset delay structure of claim 2, wherein, the locking block (9) being provided with a reset spring (15), the reset spring (15) being used to drive the slider (10) to remain in the first position.

4. The stretch-die open reset delay structure of claim 3, wherein, the locking block (9) being provided with a cavity (16) for mounting the slider (10), one end of the cavity (16) being provided with a spring baffle (17) for mounting the reset spring (15), and the other end of the cavity (16) being provided with a stop block (18) limiting the extension amount of the slider (10).

5. The stretch-die open reset delay structure of claim 2, wherein, the distance between the convex edge (14) and the protrusion (12) when the mold is closed is the certain distance.

6. The stretch-die open reset delay structure of claim 1, wherein, the end of the lower pressure plate (6) being provided with a limiting block (19), the limiting block (19) being in abutment with the slider (10).

7. The stretch-die open reset delay structure of claim 1, wherein, the end of the lower pressure plate (6) being provided with a guide slope (20), the guide slope (20) enabling the slider (10) to be automatically retracted into the locking block (9) during the closing of the mold.

8. The stretch-die open reset delay structure of claim 1, wherein, the upper die base (1) being provided with a knife seat (21), the upper end of the insert knife (11) being fixed to the knife seat (21) through a locking block (22).

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