A high-precision punching die for a trunk hinge

Abstract

A high-precision punching die for a trunk hinge includes a punching device and a stationary die base for supporting a bent tube. The punching device includes a moving die frame, an upper positioning component, a pressure plate, a punching head, and an elastic pressure component. The upper positioning component and the punching head are mounted on the moving die frame. The pressure plate and the moving die frame are connected by the elastic pressure component. The upper positioning component includes at least a pair of positioning pins. Each positioning pin and the punching head pass downward through the pressure plate. A clamping device is also included. After clamping the non-machined end of the bent tube, the machined end of the bent tube is positioned longitudinally. Then, the machined end of the bent tube is laterally positioned by the two positioning pins, thus achieving the positioning of the opening position and avoiding the influence of different rebound conditions of different bent tubes on the accuracy of the opening position. After positioning the opening position, the punching head punches and opens the hole, avoiding the occurrence of non-perpendicular opening without reducing the opening speed.

Description

Technical Field

[0001] This invention relates to the technical field of automotive trunk hinges, and in particular to a high-precision punching die for a trunk hinge. Background Technology

[0002] The car's trunk lid is mounted to the vehicle body via a hinge structure, and the trunk compartment is opened and closed by rotating it. (See reference) Figure 2 Generally, the hinge structure is a hook-shaped structure, which is formed by multiple bending processes of the tube. After the bending process of the tube is completed, it is necessary to drill a hole at one end of the tube so that the hinge bracket can be rotatably coupled at one end of the tube. Refer to the "hinge bracket 120" in the hinge assembly of the trunk lid for a vehicle in Chinese patent CN113250560A.

[0003] In existing technologies, drilling jigs are commonly used to fix pipe fittings, and then holes are drilled into the pipe fittings. For example, Chinese patent CN213496630U discloses a drilling machine for processing side holes in a trunk hinge. This patent describes a fixing structure including two arc-shaped fixing plates. The pipe fitting is fixed by these two arc-shaped fixing plates, and then a drilling machine is used to drill the hole. In practice, because bent pipes are made through multiple bending processes, different bent pipes will have different rebound characteristics. Therefore, it is difficult to accurately position the hole. If the aforementioned arc-shaped fixing plates are used to fix the bent pipe, the hole position needs to be marked, adding a marking process to ensure the accuracy of the hole position. However, this reduces production efficiency. Furthermore, when drilling the hinge with a drilling machine, if the drill bit feeds too quickly, the hole may not be perpendicular, reducing the hole position accuracy. Conversely, reducing the drilling feed speed to improve hole position accuracy will also reduce production efficiency. Therefore, a punching die is designed to solve the above problems by punching holes instead of drilling holes. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a high-precision punching die for a trunk hinge.

[0005] To achieve the above objectives, the present invention provides a high-precision punching die for a trunk hinge, comprising a punching device and a stationary die base for supporting a bent pipe; the punching device includes a movable die frame capable of lifting and lowering, an upper positioning member, a pressure plate, a punching head, and an elastic pressure member, wherein the upper positioning member and the punching head are mounted on the movable die frame; the pressure plate and the movable die frame are connected by the elastic pressure member; the upper positioning member includes at least a pair of positioning pins for laterally positioning the processed end of the bent pipe; each positioning pin and the punching head passes downward through the pressure plate; the stationary die base is equipped with a lower positioning member for laterally limiting the processed end of the bent pipe; and a clamping device is also included to clamp the bent pipe to prevent longitudinal movement of the bent pipe.

[0006] Furthermore, the lower positioning component includes at least two lower positioning blocks, and the bent pipe is pre-restricted within the lateral distance between the two lower positioning blocks by each pair of lower positioning blocks.

[0007] Furthermore, it also includes a movable die support block that can be embedded longitudinally into the cavity of the curved pipe and a horizontal drive mechanism for driving the movable die support block to move longitudinally, wherein the movable die support block is pre-set with a first positioning hole for the punch head to pass through.

[0008] Furthermore, the horizontal drive mechanism includes a fixed seat, a connecting rod, a return spring, and a push rod mounted on the moving mold frame. The fixed seat is mounted on the stationary mold base. The connecting rod slides longitudinally on the fixed seat. The return spring is sleeved on the connecting rod, and both ends of the return spring are connected to the fixed seat and the connecting rod, respectively. The push rod descends to push the movable die support block to move longitudinally to the embedded bend.

[0009] Furthermore, the end of the push rod and the end of the movable die support block are respectively provided with a first guide slope and a second guide slope. The first guide slope and the second guide slope can cooperate with each other to play a guiding role, so that when the push rod descends, it can push the movable die support block to move longitudinally to the embedded bend.

[0010] Furthermore, the stationary mold base is equipped with a movable die for supporting the processing end of the bent pipe, wherein the movable die is pre-set with a waste material leakage hole.

[0011] Furthermore, the clamping device includes a slide, a movable clamping block, and a horizontal drive unit. The slide includes an integrally formed base and a fixed clamping block. The movable clamping block is slidably fitted to the base to slide close to the fixed clamping block to clamp the bent pipe or slide away from the fixed clamping block to release the bent pipe. The horizontal drive unit is mounted on the base and is used to drive the movable clamping block to slide.

[0012] The beneficial effects of this invention are as follows: After the non-processed end of the bent pipe is clamped by the clamping device, the position of the processed end of the bent pipe is positioned longitudinally. Then, the processed end of the bent pipe is positioned laterally by two positioning pins, thereby achieving the positioning of the opening position and avoiding the influence of different rebound conditions of different bent pipes on the accuracy of the opening position. After the opening position is positioned, the punching head is used to punch and open the hole, thereby avoiding the occurrence of non-perpendicular opening without reducing the opening speed. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the moving mold frame.

[0014] Figure 2 This is a schematic diagram of the stationary mold base before hole machining.

[0015] Figure 3 This is a schematic diagram of the stationary mold base during hole machining.

[0016] Figure 4 This is a schematic diagram of a punching die before hole machining.

[0017] Figure 5 This is a schematic diagram of the moving mold frame in the positioning position.

[0018] Figure 6 This is a schematic diagram of the moving mold frame in the pressure position.

[0019] Figure 7 A schematic diagram of hole machining for a punching head.

[0020] Among them, 1-moving mold frame, 11-punching head, 12-pressure plate, 121-second through hole, 13-positioning block, 14-elastic pressure component, 15-push rod, 151-first guide slope, 2-stationary mold base, 31-machined end, 32-non-machined end, 41-base body, 42-fixed clamping block, 43-movable clamping block, 44-horizontal drive unit, 51-movable die support block, 511-first positioning hole, 512-second guide slope, 52-fixed base, 53-reset spring, 54-connecting rod, 6-lower positioning block, 7-movable die, 71-scrap material leakage hole. Implementation

[0021] To facilitate understanding of the present invention, a more complete description is given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete.

[0022] refer to Figures 1 to 4In this embodiment, a high-precision punching die for a trunk hinge includes a device body (not shown in the figure), a punching device, a stationary die base 2 for supporting a bent pipe, and a clamping device for holding the non-machined end 32 of the bent pipe. The punching device includes a moving die frame 1, a lifting drive unit (not shown in the figure), an upper positioning member, a pressure plate 12, a punching head 11, and an elastic pressure member 14. The lifting drive unit and the lower frame are mounted on the device body. The lifting drive unit is arranged on top of the moving die frame 1, and its drive end is connected to the moving die frame 1 to drive it to move up and down. The pressure plate 12 is arranged at the bottom of the moving die frame 1, and the pressure plate 12 is connected to the moving die frame 1 via the elastic pressure member 14. The elastic pressure member 14 uses compression springs, and the number of compression springs is four. When subjected to pressure, the elastic pressure member 14 can generate a counterforce against the pressure. The upper positioning component and the punch head 11 are mounted on the bottom of the moving mold frame 1. The upper positioning component includes a pair of positioning pins 13 for laterally positioning the processed end 31 of the bent pipe. The distance between the two positioning pins 13 is equal to the width of the bent pipe. The pressure plate 12 is pre-set with two first through holes for the two positioning pins 13 to pass through and a second through hole 121 for the punch head 11 to pass through. When the moving mold frame 1 is in the initial position, the two positioning pins 13 extend downward from the two first through holes, and the punch head 11 is above the second through hole 121 but does not pass through the second through hole 121.

[0023] In this embodiment, the stationary die base 2 is pre-installed with two third through holes for the two positioning pins 13 to pass through and a fourth through hole for the punch head 11 to pass through, wherein the two first through holes are respectively aligned with the two third through holes. The stationary die base 2 is pre-installed with a lower positioning component and a movable die 7 for supporting the processing end 31 of the bent pipe, wherein the lower positioning component includes two lower positioning blocks 6, which pre-limit the lateral movement range of the bent pipe within the lateral distance between the two lower positioning blocks 6; the lateral distance between the two lower positioning blocks 6 is slightly larger than the width of the bent pipe. The movable die 7 and the two lower positioning blocks 6 are both installed on the stationary die base 2 by bolts. The movable die 7 is pre-installed with a waste material discharge hole 71, wherein the second through hole 121, the fourth through hole and the waste material discharge hole 71 are aligned.

[0024] In this embodiment, the clamping device includes a slide, a movable clamping block 43, and a horizontal drive unit 44. The slide includes an integrally formed base 41 and a fixed clamping block 42, wherein the base 41 is mounted on the stationary mold base 2. The horizontal drive unit 44 is a telescopic cylinder, wherein the horizontal drive unit 44 is mounted on the base 41, and the drive end of the horizontal drive unit 44 is connected to the movable clamping block 43. The base 41 has a pre-set slotted hole. The movable clamping block 43 has a pre-set protrusion for slidingly engaging with the slotted hole, allowing the movable clamping block 43 to slide into the base 41. Driven by the horizontal drive unit 44, the movable clamping block 43 can slide close to the fixed clamping block 42 to clamp the non-machined end 32 of the bent tube or slide away from the fixed clamping block 42 to release the non-machined end 32 of the bent tube.

[0025] Reference Figures 1 to 7 In this embodiment, before punching, the bent tube is first placed on the stationary die base 2, and the processed end 31 of the bent tube is placed on the movable die 7. The processed end 31 of the bent tube is positioned between two lower positioning blocks 6. Then, the non-processed end 32 of the bent tube is placed on the seat 41 of the slide block. Driven by the horizontal drive unit 44, the movable clamping block 43 slides close to the fixed clamping block 42 to clamp and fix the non-processed end 32 of the bent tube. Then, the moving die frame 1 is driven to descend by the lifting drive unit. During the descent of the moving die frame 1, it first descends from the initial position to the positioning position, where the bent tube is precisely positioned laterally. Then, the moving die frame 1 descends from the positioning position to the pressing position, where it applies downward pressure to the bent tube to stabilize it on the stationary die base 2. The moving die frame 1 then continues to descend from the pressing position to continuously press down on the bent tube and punch the processed end 31 of the bent tube.

[0026] Specifically, during the process of the moving mold frame 1 descending from the initial position to the positioning position, the two positioning pins 13, the punch head 11, and the pressure plate 12 descend synchronously with the moving mold frame 1. When the moving mold frame 1 is in the positioning position, the two positioning pins 13 descend to the lateral sides of the bent tube and abut against the bent tube, thereby positioning the bent tube between the two positioning pins 13 and achieving precise lateral positioning of the bent tube. During the process of the moving mold frame 1 descending from the positioning position to the pressure position, the two positioning pins 13, the punch head 11, and the pressure plate 12 descend synchronously with the moving mold frame 1. When the moving mold frame 1 is in the pressure position, the pressure plate 12 contacts the top of the bent tube, and the elastic pressure member 14 is squeezed by the moving mold frame 1 and the pressure plate 12. At this time, under the reverse force generated by the elastic pressure member 14, the pressure plate 12 applies downward pressure to the bent tube, firmly pressing the bent tube onto the stationary mold base 2. As the moving die frame 1 continues to descend from the pressure position, the two positioning pins 13 and the punch head 11 descend synchronously with the moving die frame 1. The pressure plate 12 no longer descends. Under the reverse force generated by the elastic pressure member 14, the pressure plate 12 maintains downward pressure on the bent tube. Moreover, this pressure increases as the distance between the pressure plate 12 and the moving die frame 1 decreases, so that the bent tube is pressed more firmly on the stationary die base 2. In addition, during this process, the punch head 11 passes through the second through hole 121, the processed end 31 of the bent tube, and the fourth through hole in sequence to punch the processed end 31 of the bent tube.

[0027] In this embodiment, after the non-processed end 32 of the bent tube is clamped by the clamping device, the position of the processed end 31 of the bent tube is positioned longitudinally. Then, the processed end 31 of the bent tube is laterally positioned by two positioning posts 13, thus achieving the positioning of the opening position. By pressing down the processed end 31 of the bent tube with a pressure material, bending of the tube is avoided when the punching head 11 punches, increasing the stability of the punching process and improving the punching accuracy. In addition, in actual situations, since the bent tube is made through multiple bending processes, different bent tubes will have different rebound characteristics. Therefore, in this embodiment, the lateral positioning of the two positioning posts 13 ensures that bent tubes with different rebound characteristics can be corrected to a standard state without rebound (the standard state is that the prepared bent tube meets the standard size required for bent tube production), ensuring the opening accuracy. After the opening position is positioned, the punching head 11 punches and opens the hole, thus avoiding the occurrence of non-perpendicular opening without reducing the opening speed. In addition, the second through hole 121 of the pressure plate 12 guides the punching head 11, further increasing the punching stability of the punching head 11 and improving the opening accuracy.

[0028] In this embodiment, the bottom ends of the two positioning posts 13 are respectively provided with two third guide ramps, which are arranged facing each other. During the process of the moving mold frame 1 descending from the initial position to the positioning position, the two third guide ramps guide the bent tube to the space between the two positioning posts 13 and make both sides of the bent tube fit against the two positioning posts 13 respectively, thus avoiding the situation where the two positioning posts 13 collide with the bent tube and cause damage to the bent tube.

[0029] In this embodiment, to prevent the punching head 11 from causing damage to the processed end 31 of the bent tube due to compression deformation when passing through it, or to prevent the compression deformation from affecting the punching accuracy, the punching die also includes a movable die support block 51 that can be embedded longitudinally into the cavity of the bent tube, and a horizontal drive mechanism for driving the movable die support block 51 to move longitudinally. The movable die support block 51 has a first positioning hole 511 for the punching head 11 to pass through. By embedding the movable die support block 51 into the cavity of the bent tube, the movable die support block 51 supports the bent tube from within the cavity, preventing damage to the processed end 31 of the bent tube due to compression deformation when the punching head 11 passes through it. The horizontal drive mechanism includes a fixed base 52, a connecting rod 54, a return spring 53, and a push rod 15, wherein the fixed base 52 is mounted on the stationary die base 2. The connecting rod 54 slides longitudinally against the fixed seat 52; the return spring 53 is sleeved on the connecting rod 54, and both ends of the return spring 53 are connected to the fixed seat 52 and the connecting rod 54 respectively. The ends of the push rod 15 and the movable die support block 51 are respectively provided with a first guide slope 151 and a second guide slope 512, wherein the first guide slope 151 and the second guide slope 512 can cooperate with each other to provide a guiding function. The push rod 15 is installed at the bottom of the moving die frame 1, and the push rod 15 descends as the moving die frame 1 descends. During the process of the moving die frame 1 descending from the positioning position to the pressing position, the push rod 15 first descends until the first guide slope 151 and the second guide slope 512 contact each other, and then the push rod 15 continues to descend. Furthermore, through the guiding effect of the first guide slope 151 and the second guide slope 512, the push rod 15 can push the movable die support block 51 towards the processing end 31 of the bent tube as it continues to descend. When the moving mold frame 1 is in the pressure position, the push rod 15 is located between the movable die support block 51 and the fixed seat 52, and the push rod 15 passes through the fifth through hole of the stationary mold seat 2; at the same time, the movable die support block 51 is embedded in the cavity of the bent tube. When the punch head 11 performs hole processing on the processing end 31 of the bent tube, it passes through the second through hole 121, the top surface of the processing end 31 of the bent tube, the first positioning hole 511, the bottom surface of the processing end 31 of the bent tube, and the fourth through hole in sequence. The waste material generated during processing falls out from the waste material leakage hole 71.

[0030] In this embodiment, when it is necessary to remove the bent pipe after the hole processing is completed, the punching head 11 first completes the punching processing of the bent pipe, and then the moving mold frame 1 is driven to rise by the lifting drive unit, so that the two positioning pins 13, the punching head 11 and the pressure plate 12 leave the bent pipe. Then, the moving clamping block 43 is driven by the horizontal drive unit 44 to slide away from the fixed clamping block 42 to release the non-processed end 32 of the bent pipe, and then the bent pipe is taken out.

[0031] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any modifications or variations made by those skilled in the art, without departing from the scope of the present invention, using the disclosed technical content, are equivalent embodiments of the present invention. Therefore, all equivalent changes made based on the concept of the present invention without departing from the scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A high-precision piercing die for a trunk hinge, comprising a piercing device and a stationary die seat (2) to carry the elbow, characterized in that: The punching device comprises a movable die frame (1) capable of lifting, an upper positioning member, a pressing plate (12), a punching head (11) and an elastic pressing member (14), wherein the upper positioning member and the punching head (11) are installed on the movable die frame (1); the pressing plate (12) and the movable die frame (1) are connected through the elastic pressing member (14); the upper positioning member comprises at least one pair of positioning columns (13) for transversely positioning the processing end (31) of the elbow pipe; each positioning column (13) and the punching head (11) are downwardly provided through the pressing plate (12); the static die seat (2) is installed with a lower positioning member for transversely limiting the processing end (31) of the elbow pipe; further comprising a clamping device for clamping the elbow pipe to avoid longitudinal movement of the elbow pipe; The lower positioning member comprises at least two lower positioning blocks (6), and the elbow pipe is pre-limited within the transverse spacing of the two lower positioning blocks (6); Further comprising a movable concave die support block (51) capable of longitudinally embedding the lumen of the elbow pipe and a horizontal driving mechanism for driving the movable concave die support block (51) to longitudinally move, wherein the movable concave die support block (51) is pre-provided with a first positioning hole (511) for the punching head (11) to pass through; The horizontal driving mechanism comprises a fixed seat (52), a connecting rod (54), a reset spring (53) and a push rod (15) installed on the movable die frame (1), wherein the fixed seat (52) is installed on the static die seat (2); the connecting rod (54) is longitudinally slidingly fitted on the fixed seat (52); the reset spring (53) is sleeved on the connecting rod (54), and the two ends of the reset spring (53) are connected with the fixed seat (52) and the connecting rod (54) respectively; the push rod (15) is lowered to push the movable concave die support block (51) to longitudinally move to embed the elbow pipe; The end of the push rod (15) and the end of the movable concave die support block (51) are respectively pre-provided with a first guide inclined surface (151) and a second guide inclined surface (512), wherein the first guide inclined surface (151) and the second guide inclined surface (512) can cooperate with each other to guide the push rod (15) to lower to push the movable concave die support block (51) to longitudinally move to embed the elbow pipe.

2. A high-precision piercing die for a trunk hinge according to claim 1, characterized in that: The static die seat (2) is installed with a movable concave die (7) for supporting the processing end (31) of the elbow pipe, wherein the movable concave die (7) is pre-provided with a waste material leakage hole (71).

3. The high-precision piercing die for a trunk hinge according to claim 1, wherein: The clamping device comprises a sliding seat, a movable clamping block (43) and a horizontal driving unit (44), wherein the sliding seat comprises an integrally formed seat body (41) and a fixed clamping block (42); the movable clamping block (43) is slidingly fitted on the seat body (41) to slidingly approach the fixed clamping block (42) to clamp the elbow pipe or slidingly move away from the fixed clamping block (42) to release the elbow pipe; the horizontal driving unit (44) is installed on the seat body (41), wherein the horizontal driving unit (44) is used to drive the movable clamping block (43) to slide.

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