A hole flanging die for a lower link of an automobile chassis

Abstract

A flanging mold for a lower tie rod of an automobile chassis includes an upper mold and a lower mold. An upper clamping plate is provided on the lower end face of the upper mold, and a flanging punch is fixedly connected to the lower end of the upper clamping plate. A workpiece mounting seat is provided in the middle of the upper end face of the lower mold. Flanging devices for the lower mold are symmetrically arranged on both sides of the workpiece mounting seat. The flanging devices for the lower mold include a first flanging cutter block and a second flanging cutter block. The first flanging cutter block is fixedly connected to one side of the workpiece mounting seat, and the second flanging cutter block is fixedly connected to a lower wedge block. The lower wedge block is slidably fitted on the lower mold. An upper wedge block is provided on the lower end face of the upper mold at a position corresponding to the lower wedge block, for driving the lower wedge block to slide. A tie rod mounting seat is provided on the lower mold, and an elastic tie rod is fixedly provided on the tie rod mounting seat. The free end of the elastic tie rod is fixedly connected to one end of the lower wedge block, and a first guide slope is provided at the bottom of the other end of the lower wedge block. A positioning protrusion is also provided on the lower mold, and a second guide slope is provided at the lower part of the positioning protrusion for guiding and engaging with the first guide slope.

Description

Technical Field

[0001] This invention relates to the field of flanging molds, and more specifically to a flanging mold for a car chassis tie rod. Background Technology

[0002] In automotive chassis systems, the tie rod is a critical load-bearing component used to hinge with the steering knuckle and subframe components. To ensure the strength of the hinge joint between the tie rod and the steering knuckle and subframe components, the two hinge holes on the tie rod are usually flanged. The axial flange formed by the flanged holes increases the hinge contact surface and strengthens the hole edges' resistance to compression and wear, thereby improving the vehicle's handling stability and driving safety.

[0003] In the traditional machining process of turning the hinge holes of pull-down rods, in order to facilitate processing and save costs, two hinge holes are usually first made on the flat sheet metal part, and then the two hinge holes are turned over one by one. Finally, the flat sheet metal part is bent into the pull-down rod of the target structure by a bending device. However, this method has the following problems: 1. It is difficult to ensure the coaxiality of the two flip holes, which can easily lead to assembly interference and movement jamming. 2. During bending and forming, uneven tensile stress and tangential strain will be generated in the bending area of ​​the blank. This can easily cause the pre-formed hole structure sidewall to deform under the bending force, resulting in problems such as out-of-round hole opening, flange distortion, and even cracks at the root of the hole. This causes the thinning rate of the hole sidewall material to exceed the allowable threshold of the process, directly leading to the scrapping of the workpiece.

[0004] Therefore, there is an urgent need for a technical solution that can solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a flanging mold for automotive chassis tie rods. Employing a wedge-driven, double-sided synchronous flanging mold structure, it can directly perform hinge hole flanging on the bent automotive chassis tie rod. This avoids defects such as deformation and cracking caused by bending stress from the source of the process, ensures the coaxiality of the two holes, and provides stable forming quality, high processing precision, and a compact and efficient structure.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: a flanging mold for a lower tie rod of an automobile chassis, comprising an upper mold and a lower mold. An upper clamping plate is provided on the lower end face of the upper mold, and a flanging punch is fixedly connected to the lower end of the upper clamping plate. A workpiece mounting seat is provided in the middle of the upper end face of the lower mold. Flanging devices for the lower mold are symmetrically arranged on both sides of the workpiece mounting seat. The flanging devices for the lower mold include a first flanging cutter block and a second flanging cutter block. The first flanging cutter block is fixedly connected to one side of the workpiece mounting seat, and the second flanging cutter block is fixedly connected to a lower wedge block. The lower wedge block is slidably fitted on the lower mold. An upper wedge block is provided on the lower end face of the upper mold corresponding to the position of the lower wedge block, for driving the lower wedge block to slide. A tie rod mounting seat is provided on the lower mold, and an elastic tie rod is fixedly provided on the tie rod mounting seat. One end of the lower wedge block is fixedly connected to the free end of the elastic tie rod, and a first guide slope is provided at the bottom of the other end of the lower wedge block. A positioning protrusion is also provided on the lower mold, and a second guide slope is provided at the lower part of the positioning protrusion for guiding and engaging with the first guide slope.

[0007] Preferably, the upper clamping plate includes a base plate and a pressure plate. The base plate is fixedly connected to the upper mold. A plurality of elastic rods are fixedly arranged on the base plate. The pressure plate is connected to the free end of the elastic rods. A gap is left between the pressure plate and the base plate for the elastic rods to be compressed. The piercing punch is fixed on the base plate. The pressure plate is provided with a through hole for the piercing punch to pass through.

[0008] Preferably, a groove is provided on the lower mold, the lower wedge block is slidably fitted in the groove, and a first limiting block is provided on both sides of the groove.

[0009] Preferably, the lower mold is provided with a plurality of elastic push rods, and the free end of the elastic push rods is fixedly connected to the lower wedge block.

[0010] Preferably, a buffer limiting block is provided on the end face of the end where the lower wedge block is connected to the elastic tie rod.

[0011] Preferably, a second limiting block is provided at the lower end of the upper mold to limit the workpiece when the mold is closed.

[0012] Preferably, guide sleeves are provided around the upper mold, and guide rods are provided around the lower mold at positions corresponding to the guide sleeves.

[0013] Preferably, the lower end face of the upper mold is provided with a plurality of first limiting posts, and the upper end face of the lower mold is provided with a plurality of second limiting posts corresponding to the first limiting posts.

[0014] Preferably, an elastic support rod is fixedly provided on the lower mold, and the free end of the elastic support rod is fixedly connected to the lower end of the positioning protrusion.

[0015] The beneficial effects of this invention are as follows: 1. This invention directly performs hinge hole flanging on the bent pull rod workpiece, abandoning the traditional "flanging first, then bending" processing technology. It fundamentally avoids defects such as deformation of the flanging sidewall, out-of-roundness of the hole, flange distortion, and cracking at the root of the flanging caused by the bending stress of the blank in the bending process. It keeps the thinning rate of the flanging sidewall material stably within the allowable threshold of the process, significantly improving the mechanical properties of the product and the processing qualification rate.

[0016] 2. This invention symmetrically sets up lower mold flipping devices on both sides of the workpiece mounting base. The flipping devices on both sides are exactly the same. Relying on a single mold closing action, the flipping forming of the double-sided hinge holes is completed synchronously. The two flipping processes are combined into one mold. By limiting and positioning the workpiece in multiple ways, the problem of the coaxiality of traditional flipping is difficult to guarantee. This eliminates the hidden dangers of subsequent assembly interference and movement jamming, and improves the assembly accuracy of the pull rod and the overall vehicle handling stability.

[0017] 3. This invention achieves precise workpiece positioning and high-precision tool feeding through the combination of multiple structures such as elastic pressing, inclined guide, sliding groove limiting, and guide pillars and guide sleeves; combined with elastic reset, buffer limiting and mold closing stroke limiting structures, it effectively reduces the impact wear of mold components and improves the stability and service life of mold operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the upper mold structure of the present invention; Figure 3 This is a schematic diagram of the lower mold structure of the present invention; Figure 4 This is a schematic diagram of the lower mold of the present invention excluding the workpiece mounting base; Figure 5 This is a schematic diagram of the structure of the lower mold flipping device of the present invention; Figure 6 This is a schematic diagram of the upper clamping plate of the present invention. Detailed Implementation

[0019] See Figures 1 to 6A flanging mold for a car chassis pull rod includes an upper mold 1 and a lower mold 2. An upper clamping plate 3 is provided on the lower end face of the upper mold 1. A flanging punch 31 is fixedly connected to the lower end of the upper clamping plate 3. The upper clamping plate 3 includes a base plate 32 and a pressure plate 33. The base plate 32 is fixedly connected to the upper mold 1. A plurality of elastic rods 34 are fixedly provided on the base plate 32. The pressure plate 33 is connected to the free end of the elastic rods 34. A gap 35 is left between the pressure plate 33 and the base plate 32 for the elastic rods 34 to be compressed. The flanging punch 31 is fixed on the base plate 32. A through hole is provided on the pressure plate 33 for the flanging punch 31 to pass through. This invention connects the base plate 32 and the pressure plate 33 via an elastic rod 34. When the mold is not closed, the flipping punch 31 is located inside the upper clamping plate 3. When the mold closes, the pressure plate 33 first contacts the workpiece 8 and completes pre-clamping. As the mold deepens and the elastic rod 34 compresses, the flipping punch 31 extends from the through hole in the pressure plate 33 to flip the workpiece 8, ensuring a pre-clamping sequence and preventing workpiece 8 from shifting during processing. Furthermore, the elastic rod 34 provides flexible clamping force, preventing rigid pressure from damaging the surface of the workpiece 8, while also buffering the impact of mold closing, protecting the pressure plate and the flipping punch, and extending the mold's service life. A workpiece mounting seat 4 is provided in the middle of the upper end face of the lower die 2. The workpiece mounting seat 4 is T-shaped. Two bent pull rod workpieces are respectively clamped on the upper two sides of the workpiece mounting seat 4. The lower die flipping device is symmetrically arranged on both sides of the workpiece mounting seat 4. The lower die flipping device includes a first flipping cutter block 51 and a second flipping cutter block 52. The first flipping cutter block 51 and the second flipping cutter block 52 are both provided with semi-circular flipping cutter edges. The two together form a complete circular flipping cutter block, which abuts against the outer wall of the hole to be processed and works together with the flipping punch to process the flipping structure. The first flanging cutter block 51 is fixedly connected to one side of the workpiece mounting base 4. The second flanging cutter block 52 is fixedly connected to a lower wedge block 53. A groove 21 is provided on the lower mold 2. A first slider for reducing friction is laid at the bottom of the groove 21. The lower wedge block 53 slides with the slider. A first limiting block 211 is provided on both sides of the groove 21. A second slider for reducing friction is provided on both sides of the lower wedge block 53. The second slider slides with the first limiting block 211. The groove 21 constrains the sliding trajectory of the lower wedge block 53, ensuring that the lower wedge block 53 feeds along the set direction of the groove 21, improving the feed position accuracy of the second flanging cutter block 52, ensuring the consistency of the flanging size, and preventing the lower wedge block 53 from dislodging by setting the first limiting block 211. The upper mold 1 has an upper wedge 6 positioned at the lower end corresponding to the lower wedge 53, which is used to drive the lower wedge 53 to slide. The upper wedge 6 has a clearance groove, which is used to make way for the elastic pull rod 541 when the lower wedge 53 is driven to slide.The lower mold 2 is provided with a tie rod mounting seat 54, on which an elastic tie rod 541 is fixedly mounted. The free end of the elastic tie rod 541 is fixedly connected to one end of the lower wedge block 53. The bottom of the other end of the lower wedge block 53 is provided with a first guide slope 531. A buffer limiting block 532 is provided on the end face of the lower wedge block 53 connected to the elastic tie rod 541. By providing the buffer limiting block 532, when the lower wedge block 53 is reset to its position, the buffer limiting block 532 replaces the lower wedge block 53 body and contacts the tie rod mounting seat 54, absorbing impact kinetic energy, reducing mold impact noise, and avoiding component deformation and wear caused by rigid collision. The lower mold 2 is also provided with a positioning protrusion 7. The lower part of the positioning protrusion 7 is provided with a second guide slope 71 for guiding and cooperating with the first guide slope 531, so that the positioning protrusion 7 rises axially and inserts into the hole on the workpiece 8 to achieve precise positioning. An elastic support rod 9 is fixedly installed on the lower mold 2. The free end of the elastic support rod 9 is fixedly connected to the lower end of the positioning protrusion 7. When the upper mold 1 retracts and the lower wedge 53 resets, the positioning protrusion 7 returns to its original position under gravity, supported and buffered by the elastic support rod 9. A second limiting block 11 is provided at the lower end of the upper mold 1 to limit the workpiece 8 when the mold is closed. When the mold is closed, the second limiting block 11 moves down with the upper mold 1, forming an auxiliary limit on the workpiece 8 from the side. It cooperates with the lower workpiece mounting seat 4 to form a multi-directional constraint, preventing the workpiece from tilting or shifting due to lateral force during the turning process, and improving the workpiece positioning accuracy. Guide sleeves 12 are provided around the upper mold 1, and guide rods 22 are provided around the lower mold 2 at positions corresponding to the guide sleeves 12. The cooperation of the guide sleeves 12 and guide rods 22 ensures mold alignment when the mold is closed, making the positions of the upper wedge and lower wedge, and the turning punch and workpiece hole accurate, avoiding mold wear and processing errors caused by off-center loading.

[0020] In this embodiment, the lower mold 2 is provided with multiple elastic push rods 55. Four push rods are provided in this embodiment, divided into two groups of two, each group connected to the left and right lower wedges 53 respectively. The free end of each elastic push rod 55 is fixedly connected to the lower wedge 53. The elastic push rods 55 and elastic pull rods 541 jointly provide the reset force, forming a double reset redundancy. This avoids reset jamming due to the failure of the elastic pull rods 541, ensuring smooth reset of the lower wedges 53 after mold opening. Simultaneously, during the mold closing feed process, the elastic push rods 55 provide reverse buffer damping, making the feed speed of the second flanging cutter 52 smoother, reducing the impact of the second flanging cutter 52 upon contact with the workpiece 8, improving the quality of the flanging forming surface, and extending the tool life.

[0021] In this embodiment, four first limiting posts 13 are provided on the lower end face of the upper mold 1, divided into two groups of two, symmetrically arranged on both sides of the upper end face of the lower mold 2. Four second limiting posts 23 corresponding to the first limiting posts 13 are provided on the upper end face of the lower mold 2. By connecting the first limiting posts 13 and the second limiting posts 23 during mold closing, the maximum downward depth of mold closing is precisely limited, preventing excessive mold closing from causing rigid impact between the flanging punch, cutting tool, and workpiece or lower mold, thus protecting the core forming components. Simultaneously, the final position of each mold closing is standardized, ensuring that the feed depth of the flanging punch and the feed amount of the lateral cutting tool remain consistent, guaranteeing the stability of the flanging height and forming dimensions of batch products.

[0022] The usage process of this invention is as follows: First, two bent and formed pull rod workpieces are clamped on both sides of the workpiece mounting base, and the first piercing cutter block is brought into contact with the outer wall of the hole to be processed. Then, the upper die is driven to move downward by the press to achieve die closing. During the continuous downward movement of the upper die, the two second limiting blocks move downward to the sides of the two workpieces to limit the workpieces. At the same time, the two upper wedge blocks move downward to drive the two lower wedge blocks to slide along the slide groove, so that the two second piercing cutter blocks are fed towards the workpiece's position. At this time, the elastic pull rod connected to the two second piercing cutter blocks is stretched, and the corresponding elastic push rod is compressed. The first guide slope of the two lower wedge blocks respectively cooperates with the second guide slope of the corresponding positioning protrusion, so that the two positioning protrusions move axially upward and are inserted into the hole of the corresponding workpiece to achieve positioning. The clamping plates of the clamping plate contact the upper surfaces of the two workpieces respectively, pressing the two workpieces together. The upper die continues to move down until the first limit post and the second limit post abut. At this time, the elastic rod of the upper clamping plate is compressed, and the flipping punch passes through the through hole of the clamping plate to flip the hole of the workpiece. At the same time, the second flipping cutter and the first flipping cutter form a circular cutter block that abuts against the outer wall of the hole to be processed on the workpiece. The flipping punch, the second flipping cutter and the first flipping cutter block work together to process the flipping structure of the hole of the workpiece. After processing, the upper die is retracted, and the lower wedge is reset under the action of the elastic push rod and the elastic pull rod. Then the two workpieces are removed and the two workpieces are swapped. The other hole of the two workpieces is flipped. The processing process is the same as the previous flipping process. After completion, the workpiece is removed, and the flipping processing of the two holes of the pull rod is completed.

[0023] In this invention, the guide sleeve and guide post cooperate to ensure accurate mold closing, the second limiting block limits the workpiece to prevent it from moving, the positioning protrusion positions the workpiece to ensure the corresponding position of the two holes on the workpiece, and the pressure plate limits and presses the position of the hole to be processed on the workpiece. These structures together ensure the coaxiality of the two holes of the workpiece during processing.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications made to the present invention by those skilled in the art without departing from the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A flanging mold for a car chassis tie rod, comprising an upper mold (1) and a lower mold (2), characterized in that: The upper mold (1) has an upper clamping plate (3) on its lower end face. The lower end of the upper clamping plate (3) is fixedly connected to a piercing punch (31). The lower mold (2) has a workpiece mounting seat (4) in the middle of its upper end face. The workpiece mounting seat (4) has symmetrically arranged lower mold piercing devices on both sides. The lower mold piercing devices include a first piercing cutter block (51) and a second piercing cutter block (52). The first piercing cutter block (51) is fixedly connected to one side of the workpiece mounting seat (4). The second piercing cutter block (52) is fixedly connected to a lower wedge block (53). The lower wedge block (53) slides on the lower mold (2). The upper mold (1) An upper wedge (6) is provided on the lower end face corresponding to the lower wedge (53) to drive the lower wedge (53) to slide. A pull rod mounting seat (54) is provided on the lower mold (2). An elastic pull rod (541) is fixedly provided on the pull rod mounting seat (54). The free end of the elastic pull rod (541) is fixedly connected to one end of the lower wedge (53). A first guide slope (531) is provided at the bottom of the other end of the lower wedge (53). A positioning protrusion (7) is also provided on the lower mold (2). A second guide slope (71) is provided at the lower part of the positioning protrusion (7) to guide and cooperate with the first guide slope (531).

2. The flanging mold for a car chassis tie rod according to claim 1, characterized in that: The upper clamping plate (3) includes a base plate (32) and a pressure plate (33). The base plate (32) is fixedly connected to the upper mold (1). Multiple elastic rods (34) are fixedly arranged on the base plate (32). The pressure plate (33) is connected to the free end of the elastic rod (34). A gap (35) is left between the pressure plate (33) and the base plate (32) for the elastic rod (34) to be compressed. The piercing punch (31) is fixed on the base plate (32). The pressure plate (33) is provided with a through hole for the piercing punch (31) to pass through.

3. The flanging mold for a car chassis tie rod according to claim 1, characterized in that: The lower mold (2) is provided with a slide groove (21), the lower wedge block (53) is slidably fitted in the slide groove (21), and the two sides of the slide groove (21) are respectively provided with first limiting blocks (211).

4. The flanging mold for a car chassis tie rod according to claim 1, characterized in that: Multiple elastic push rods (55) are provided on the lower mold (2), and the free end of the elastic push rod (55) is fixedly connected to the lower wedge block (53).

5. The flanging mold for a car chassis tie rod according to claim 1, characterized in that: A buffer limit block (532) is provided on the end face of the lower wedge block (53) that is connected to the elastic tie rod (541).

6. The flanging mold for a car chassis tie rod according to claim 1, characterized in that: The upper mold (1) is provided with a second limiting block (11) at its lower end, which is used to limit the workpiece (8) when the mold is closed.

7. The flanging mold for a car chassis tie rod according to claim 1, characterized in that: The upper mold (1) is provided with guide sleeves (12) around its perimeter, and the lower mold (2) is provided with guide rods (22) around its perimeter at positions corresponding to the guide sleeves (12).

8. The flanging mold for a car chassis tie rod according to claim 1, characterized in that: The lower end face of the upper mold (1) is provided with a plurality of first limiting posts (13), and the upper end face of the lower mold (2) is provided with a plurality of second limiting posts (23) corresponding to the first limiting posts (13).

9. The flanging mold for a car chassis tie rod according to claim 1, characterized in that: An elastic support rod (9) is fixedly installed on the lower mold (2), and the free end of the elastic support rod (9) is fixedly connected to the lower end of the positioning protrusion (7).

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