A crack-resistant tensile mold for automotive parts

Abstract

This utility model discloses an anti-cracking stretching die for automotive parts, relating to the field of automotive parts processing technology. It includes a fixed hanging plate, an anti-cracking stretching unit, and a demolding and material transfer unit. This utility model features a reliable anti-cracking stretching unit, and rounded corner structures at the calender head and the inner mold groove of the bottom die, enabling a smoother stretching deformation process and preventing scratches or damage to the workpiece surface. Furthermore, the design of the blank holder and draw beads increases the resistance during workpiece stretching, thereby preventing excessive material flow into the mold groove and reducing the risk of workpiece cracking. The cooperation of the telescopic rod and spring allows the blank holder to automatically reset when the calender head is lifted. It also features a reliable demolding and material transfer unit that ejects the workpiece from the inside of the bottom die after stretching, and a horizontal conveying mechanism that transports the workpiece horizontally backward, avoiding the risks associated with manual handling.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts processing technology, specifically to an anti-cracking stretching mold for automotive parts. Background Technology

[0002] Stretching dies play a central role in automotive parts manufacturing, particularly in the shaping of lightweight, high-precision, and high-strength materials, where they are irreplaceable. Stretching dies are primarily used to shape complex curved surfaces and high-strength structural components in automotive parts manufacturing; the core technology lies in controlling material flow and stress distribution.

[0003] During the stamping process, if the flow rate of the workpiece is too fast, it can cause wrinkling of the workpiece or even lead to stacking, cracking, or damage to the mold surface. In addition, since some existing equipment only has a simple product ejection function, the product still needs to be removed manually after ejection. However, if some workers rashly remove it by hand, there will be safety hazards. Therefore, we propose a crack-resistant stretching die for automotive parts. Utility Model Content

[0004] The technical problem this invention aims to solve is to overcome existing defects and provide an anti-cracking stretching die for automotive parts. This die features a reliable anti-cracking stretching unit, a rounded corner structure at the calender head and the inner mold groove of the bottom die, which makes the stretching deformation process of the workpiece smoother, avoiding scratches or damage to the workpiece surface. Furthermore, the design of the blank holder and draw beads increases the resistance during workpiece stretching, thereby preventing excessive material flow into the mold groove and reducing the risk of workpiece cracking. The cooperation of the telescopic rod and spring allows the blank holder to automatically reset when the calender head is lifted. The semi-circular cross-section draw beads and slots can interlock, providing sufficient resistance to control material flow and wrinkling without excessive resistance leading to cracking. It also features a reliable demolding and material transfer unit that ejects the workpiece from the inside of the bottom die after stretching, and a horizontal transfer mechanism that transports the workpiece horizontally backward, avoiding the risks associated with manual handling. This effectively solves the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a crack-resistant stretching mold for automotive parts, comprising a fixed hanging plate, a crack-resistant stretching unit, and a demolding and material transfer unit;

[0006] Fixed hanging plate: It is a square plate that is fixed to the external mounting frame;

[0007] Crack-resistant tensioning unit: includes a hydraulic cylinder, a mounting column, a calender head, a pressure ring, a protrusion, a telescopic rod, a spring, and a top block. The hydraulic cylinder is installed at the lower center of the fixed hanging plate. The telescopic end of the hydraulic cylinder faces downward and its lower end is fixedly connected to the center of the upper end of the mounting column. The lower end of the mounting column is fixedly connected to the calender head, and the lower edge of the calender head has a rounded corner structure. The pressure ring is slidably connected to the outer side of the mounting column. Four protrusions are fixedly connected in a circumferential array on the upper outer edge of the mounting column. Each protrusion is fixedly connected to a telescopic rod between itself and the pressure ring. The telescopic rod is fitted with a spring and a top block. The top block is fixedly connected to the upper and lower ends of the spring. The upper and lower top blocks are slidably connected to the telescopic rod and are respectively pressed against the protrusion and the pressure ring.

[0008] Demolding and material transfer unit: installed below the calendering head.

[0009] The fixed hanging plate is used for the installation of hydraulic cylinder one. Hydraulic cylinder one drives the mounting column to rise and fall. When the mounting column descends, the workpiece is pressed into the bottom mold through the calender head at its lower end, thereby stretching the workpiece. The rounded corner structure at the calender head and the inner mold groove of the bottom mold makes the stretching deformation process of the workpiece smoother, avoids scratches or damage to the workpiece surface, and can disperse stress, extending the mold life. By setting the blank holder, pressure can be applied to the periphery of the contact point between the workpiece and the calender head during the pressure stretching process, thereby preventing the material from flowing into the mold groove too quickly and reducing the risk of workpiece cracking. Through the cooperation of the telescopic rod and the spring, the blank holder can automatically return to a lower position on the outside of the mounting column when the calender head is raised. The top block at the end can effectively apply the spring force to the protrusion and the blank holder.

[0010] Furthermore, the anti-cracking stretching unit also includes a bottom mold, drawbeads, and a retaining groove. A cylindrical bottom mold is installed below the mounting column, with a circular mold groove centrally located at the upper end of the bottom mold. The ends of the upper mold groove are rounded. A circular drawbead is fixedly connected to the annular plane at the upper end of the bottom mold. A circular retaining groove is located at the lower end of the pressure ring. The retaining groove has the same diameter and cross-sectional dimensions as the drawbead and is vertically aligned in space. By setting the drawbeads, the resistance during workpiece stretching can be increased, thereby controlling the workpiece's travel speed. The semi-circular cross-section drawbeads and retaining grooves can interlock, providing sufficient resistance to control material flow and wrinkling without causing excessive resistance that could lead to cracking.

[0011] Furthermore, the demolding and material transfer unit includes an ejector frame, a second hydraulic cylinder, and mounting slots. A flat, cylindrical ejector frame is slidably connected inside the bottom mold. The second hydraulic cylinder is installed on the bottom center side of the ejector frame, with its telescopic end facing downwards and fixedly connected to the bottom of the bottom mold. Two horizontal square mounting slots are provided at the upper end of the ejector frame. The second hydraulic cylinder controls the lifting and lowering of the ejector frame inside the bottom mold. When the ejector frame rises, it can push the workpiece formed inside the mold groove upwards. The mounting slots are used for installing the lifting slide and the feeding roller.

[0012] Furthermore, the demolding and material transfer unit also includes a lifting slide, a hydraulic cylinder, and a feeding roller. The lifting slide, which has a U-shaped structure, is slidably connected inside the mounting groove, and a feeding roller is rotatably connected to its upper inner side. A power motor and a transmission belt are embedded inside the lifting slide. The power motor drives the upper feeding roller to rotate via the transmission belt. A hydraulic cylinder is installed at the bottom of the lifting slide, corresponding to the mounting groove, with its extension end facing upwards and fixedly connected to the bottom of the lifting slide. The lifting slide is used to drive the feeding roller to move up and down. After the formed workpiece is ejected by the top material holder, the hydraulic cylinder activates, and the lifting slide drives the feeding roller to rise from inside the mounting groove, lifting the workpiece away from the surface of the top material holder. Subsequently, the motor inside the lifting slide starts, driving the upper feeding roller to rotate. The two feeding rollers rotate in the same direction, horizontally transferring the workpiece backwards, avoiding the risks associated with manual handling.

[0013] Furthermore, the demolding and material transfer unit also includes rubber strips. Multiple rubber strips are fixedly connected in a circumferential array to the outer side of the feeding roller. The rubber strips are arranged laterally, with half of them engaged in slots on the outer side of the feeding roller. The rubber strips increase the friction between the feeding roller and the workpiece, thereby improving the stability of the conveying process.

[0014] Furthermore, it also includes retaining rings and countersunk holes. Countersunk holes are provided at the four corners of the lower end of the fixed hanging plate, and retaining rings are fixedly connected to the middle side of the lower end of the fixed hanging plate. The retaining rings clamp the upper end of the hydraulic cylinder. The retaining rings are used to secure the hydraulic cylinder, and the countersunk holes are used for the installation of bolt fasteners. In this way, the fixed hanging plate can be installed and fixed on the lower side of the external mounting frame to realize the hoisting of the hydraulic cylinder.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: This anti-cracking tensile mold for automotive parts has the following advantages:

[0016] 1. It features a reliable anti-cracking stretching unit, and the rounded corner structure at the inner die groove of the calender head and bottom die makes the stretching deformation process of the workpiece smoother, avoiding scratches or damage to the workpiece surface; and the setting of the blank holder and draw beads increases the resistance during workpiece stretching, thereby preventing the material from flowing into the die groove too quickly and reducing the risk of workpiece cracking; the cooperation of the telescopic rod and spring can make the blank holder automatically reset when the calender head is lifted, and the semi-circular cross-section draw beads and the slot can interlock with each other, providing sufficient resistance to control material flow and wrinkling, without excessive resistance leading to cracking;

[0017] 2. It has a reliable demolding and material transfer unit, which can eject the workpiece from the inside of the bottom mold after stretching, and has a horizontal transfer mechanism, which can transfer the workpiece horizontally backward, avoiding the risks of manual handling.

[0018] 3. This utility model features a reliable anti-cracking stretching unit, and rounded corner structures at the calender head and the inner mold groove of the bottom die, which make the stretching deformation process of the workpiece smoother and avoid scratches or damage to the workpiece surface. Furthermore, the setting of the blank holder and draw beads increases the resistance during workpiece stretching, thereby preventing the material from flowing into the mold groove too quickly and reducing the risk of workpiece cracking. The cooperation of the telescopic rod and spring allows the blank holder to automatically reset when the calender head is lifted, and the semi-circular cross-section draw beads and slots can interlock, providing sufficient resistance to control material flow and wrinkling without excessive resistance leading to cracking. It also features a reliable demolding and material transfer unit, which can eject the workpiece from the inside of the bottom die after stretching, and a horizontal transfer mechanism that can horizontally transport the workpiece backward, avoiding the risks associated with manual handling. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a partial structural diagram of the present invention;

[0021] Figure 3 This is a cross-sectional view of the internal structure of the bottom mold in this utility model.

[0022] In the diagram: 1. Fixed hanging plate, 2. Anti-crack stretching unit, 21. Hydraulic cylinder one, 22. Mounting column, 23. Calendering head, 24. Pressing ring, 25. Protrusion, 26. Telescopic rod, 27. Spring, 28. Top block, 29. Bottom mold, 210. Draw bead, 211. Slot, 3. Demolding and material transfer unit, 31. Top material rack, 32. Hydraulic cylinder two, 33. Mounting slot, 34. Lifting slide, 35. Hydraulic cylinder three, 36. Feeding roller, 37. Rubber strip, 4. Snap ring, 5. Countersunk hole. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figures 1-3 This embodiment provides a technical solution: an anti-cracking stretching mold for automotive parts, including a fixed hanging plate 1, an anti-cracking stretching unit 2, and a demolding and material transfer unit 3;

[0025] Fixed hanging plate 1: It is a square plate that is fixed to the external mounting frame;

[0026] Crack-resistant tension unit 2: includes hydraulic cylinder 21, mounting column 22, calender head 23, pressure ring 24, protrusion 25, telescopic rod 26, spring 27, and top block 28. Hydraulic cylinder 21 is installed at the lower center of the fixed hanging plate 1, with its telescopic end facing downwards and its lower end fixedly connected to the center of the upper end of the mounting column 22. The lower end of the mounting column 22 is fixedly connected to the calender head 23, whose lower edge has a rounded corner structure. A pressure ring 24 is slidably connected to the outer side of the column 22. Four protrusions 25 are fixedly connected in a circular array on the upper outer edge of the mounting column 22. A telescopic rod 26 is fixedly connected between each protrusion 25 and the pressure ring 24. A spring 27 and a top block 28 are sleeved on the outer side of the telescopic rod 26. The top block 28 is fixedly connected to the upper and lower ends of the spring 27. The upper and lower top blocks 28 are slidably connected to the telescopic rod 26 and are respectively pressed against the protrusion 25 and the pressure ring 24.

[0027] Demolding and material transfer unit 3: installed below the calendering head 23.

[0028] The fixed hanging plate 1 is used for the installation of the hydraulic cylinder 21. The hydraulic cylinder 21 drives the mounting column 22 to rise and fall. When the mounting column 22 descends, the workpiece is pressed into the bottom mold 29 through the calender head 23 at its lower end, thereby stretching the workpiece. The rounded corner structure at the inner mold groove of the calender head 23 and the bottom mold 29 makes the stretching deformation process of the workpiece smoother, avoids scratches or damage on the workpiece surface, and can disperse stress and extend the mold life. By setting the pressure ring 24, pressure can be applied to the periphery of the contact point between the workpiece and the calender head 23 during the pressure stretching process, thereby avoiding the material flowing into the mold groove too quickly and reducing the risk of workpiece cracking. Through the cooperation of the telescopic rod 26 and the spring 27, the pressure ring 24 can be automatically reset to a lower position on the outside of the mounting column 22 when the calender head 23 is raised. The top block 28 at the end can effectively apply the elastic force of the spring 27 to the protrusion 25 and the pressure ring 24.

[0029] The anti-crack stretching unit 2 also includes a bottom mold 29, draw beads 210, and a slot 211. A cylindrical bottom mold 29 is installed below the mounting column 22. A circular mold groove is centrally located at the upper end of the bottom mold 29, with rounded corners at the ends of the upper mold groove. A circular ring of draw beads 210 is fixedly connected to the annular plane at the upper end of the bottom mold 29. A ring of slots 211 is located at the lower end of the pressure ring 24. The slots 211 and draw beads 210 have the same diameter and cross-sectional dimensions, and are vertically aligned in space. The draw beads 210 increase the resistance during workpiece stretching, thereby controlling the workpiece's travel speed. The semi-circular cross-section of the draw beads 210 and the slots 211 interlock, providing sufficient resistance to control material flow and wrinkling without causing excessive resistance and cracking.

[0030] The demolding and material transfer unit 3 includes an ejector frame 31, a second hydraulic cylinder 32, and a mounting groove 33. A flat, cylindrical ejector frame 31 is slidably connected inside the bottom mold 29. The second hydraulic cylinder 32 is mounted on the bottom center side of the ejector frame 31, with its extension end facing downwards and fixedly connected to the bottom of the bottom mold 29. Two horizontally oriented square mounting grooves 33 are provided at the upper end of the ejector frame 31. The second hydraulic cylinder 32 controls the lifting and lowering of the ejector frame 31 inside the bottom mold 29. When the ejector frame 31 rises, it ejects the workpiece formed inside the mold groove upwards. The mounting groove 33 is used for mounting the lifting slide 34 and the feeding roller 36.

[0031] The demolding and material transfer unit 3 also includes a lifting slide 34, a hydraulic cylinder 35, and a feeding roller 36. The lifting slide 34 is slidably connected inside the mounting groove 33. The lifting slide 34 has a U-shaped structure and the feeding roller 36 is rotatably connected to the inner side of the upper end. A power motor and a transmission belt are embedded inside the lifting slide 34. The power motor drives the upper feeding roller 36 to rotate through the transmission belt. A hydraulic cylinder 35 is installed at the bottom of the lifting slide 34 and at the position corresponding to the mounting groove 33. The telescopic end of the hydraulic cylinder 35 faces upward and is fixedly connected to the bottom of the lifting slide 34. The lifting slide 34 is used to drive the feeding roller 36 to lift and lower. After the formed workpiece is pushed out by the top material frame 31, the hydraulic cylinder 35 is started, and the lifting slide 34 drives the feeding roller 36 to rise from inside the mounting groove 33, supporting the workpiece away from the surface of the top material frame 31. Then the motor inside the lifting slide 34 is started, driving the upper feeding roller 36 to rotate. The two feeding rollers 36 rotate in the same direction, transferring the workpiece horizontally backward, avoiding the risks caused by manual handling.

[0032] The demolding and material transfer unit 3 also includes rubber strips 37. Multiple rubber strips 37 are fixedly connected in a circumferential array on the outer side of the feeding roller 36. The rubber strips 37 are arranged laterally, and half of them are engaged in slots on the outer side of the feeding roller 36. The rubber strips 37 can increase the friction between the feeding roller 36 and the workpiece, thereby improving the stability of the conveying.

[0033] It also includes retaining rings 4 and countersunk holes 5. Countersunk holes 5 are provided at the four corners of the lower end of the fixed hanging plate 1. Retaining rings 4 are fixedly connected to the middle side of the lower end of the fixed hanging plate 1, and retaining rings 4 clamp the upper end of the hydraulic cylinder 21. Retaining rings 4 are used to secure the hydraulic cylinder 21, and countersunk holes 5 are used for the installation of bolt fasteners. Thus, the fixed hanging plate 1 can be installed and fixed on the lower side of the external mounting frame to realize the hoisting of the hydraulic cylinder 21.

[0034] The working principle of the anti-cracking stretching die for automotive parts provided by this utility model is as follows: This stretching die has a reliable anti-cracking stretching unit 2, and a fixed hanging plate 1 is used for the installation of hydraulic cylinder 21. Hydraulic cylinder 21 drives the mounting column 22 to rise and fall. When the mounting column 22 descends, the workpiece is pressed into the bottom die 29 through the calendering head 23 at its lower end, thereby stretching the workpiece. The rounded corner structure of the calendering head 23 and the inner mold groove of the bottom die 29 can make the stretching deformation process of the workpiece smoother, avoid scratches or scratches on the surface of the workpiece, and can disperse stress and extend the mold life. By setting the blank holder 24, pressure can be applied to the periphery of the contact point between the workpiece and the calender head 23 during the pressure stretching process, thereby preventing the material from flowing into the die groove too quickly and reducing the risk of workpiece cracking. With the cooperation of the telescopic rod 26 and the spring 27, the blank holder 24 can be automatically reset to a lower position outside the mounting post 22 when the calender head 23 is lifted. The top block 28 at the end can effectively apply the elastic force of the spring 27 to the protrusion 25 and the blank holder 24. By setting the draw bead 210, the resistance during workpiece stretching can be increased, thereby controlling the workpiece travel speed. The semi-circular cross-section draw bead 210 and the slot 211 can be interlocked, providing sufficient resistance to control material flow and wrinkling, without excessive resistance leading to cracking. This stretching die also features a reliable demolding and material transfer unit 3, which can eject the workpiece from the bottom die 29 after stretching. It also has a horizontal transfer mechanism that can transport the workpiece horizontally backward, avoiding the risks associated with manual handling. Hydraulic cylinder 32 controls the lifting and lowering of the ejector frame 31 inside the bottom die 29. When the ejector frame 31 rises, it can eject the workpiece formed inside the die groove upward. The mounting groove 33 is used for mounting the lifting slide 34 and the feeding roller 36. The lifting slide 34 drives the feeding roller 36 to rise and fall. After the formed workpiece is ejected by the ejector frame 31, hydraulic cylinder 35 is activated, and the lifting slide 34 drives the feeding roller 36 to rise from inside the mounting groove 33, pushing the workpiece away from the surface of the ejector frame 31. Then, the motor inside the lifting slide 34 is activated, driving the upper feeding roller 36 to rotate. The two feeding rollers 36 rotate in the same direction, transporting the workpiece horizontally backward, avoiding the risks associated with manual handling. In addition, the rubber strip 37 can increase the friction between the feeding roller 36 and the workpiece, thereby improving the stability of the conveying. The retaining ring 4 is used to secure the hydraulic cylinder 21, and the countersunk hole 5 is used for the installation of bolt fasteners. Thus, the fixed hanging plate 1 can be installed and fixed on the lower side of the external mounting frame to realize the hoisting of the hydraulic cylinder 21.

[0035] It is worth noting that the input terminals of the internal motors of hydraulic cylinder 21, hydraulic cylinder 32, hydraulic cylinder 35 and lifting slide 34 disclosed in the above embodiments are all electrically connected to the output terminal of an external power supply through an external control switch group. The control switch group controls the operation of the above electrical devices using methods commonly used in the prior art.

[0036] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An anti-cracking stretch die for an automobile part, characterized by: It includes a fixed hanging plate (1), a crack-resistant tensioning unit (2), and a demolding and material transfer unit (3); Fixed hanging plate (1): It is a square plate that is fixed to the external mounting frame; Crack-resistant tension unit (2): includes a hydraulic cylinder (21), a mounting column (22), a calender head (23), a pressing ring (24), a protrusion (25), a telescopic rod (26), a spring (27), and a top block (28). The hydraulic cylinder (21) is installed at the lower center of the fixed hanging plate (1). The telescopic end of the hydraulic cylinder (21) faces downward, and its lower end is fixedly connected to the center of the upper end of the mounting column (22). The lower end of the mounting column (22) is fixedly connected to the calender head (23). The lower edge of the calender head (23) has a rounded corner structure. A pressure ring (24) is slidably connected to the outer side of the mounting post (22). Four protrusions (25) are fixedly connected in a circular array on the upper outer edge of the mounting post (22). A telescopic rod (26) is fixedly connected between each protrusion (25) and the pressure ring (24). A spring (27) and a top block (28) are sleeved on the outer side of the telescopic rod (26). The top block (28) is fixedly connected to the upper and lower ends of the spring (27). The upper and lower top blocks (28) are slidably connected to the telescopic rod (26) and are respectively pressed against the protrusion (25) and the pressure ring (24). Demolding and material transfer unit (3): installed below the calendering head (23).

2. The anti-cracking tensile die for automotive parts according to claim 1, characterized in that: The anti-crack stretching unit (2) also includes a bottom mold (29), a drawbead (210), and a slot (211). A cylindrical bottom mold (29) is installed below the mounting column (22). A circular mold groove is provided in the center of the upper end of the bottom mold (29). The port of the upper mold groove of the bottom mold (29) is rounded. A circular drawbead (210) is fixedly connected to the annular plane at the upper end of the bottom mold (29). A ring-shaped slot (211) is provided at the lower end of the pressure ring (24). The slot (211) and the drawbead (210) have the same diameter and cross-sectional dimensions, and are vertically aligned in space.

3. A crack free stretch die for automobile parts as claimed in claim 2 wherein: The demolding and material transfer unit (3) includes a top material rack (31), a hydraulic cylinder (32) and a mounting groove (33). The bottom mold (29) is slidably connected to a flat cylindrical top material rack (31). A hydraulic cylinder (32) is installed on the middle side of the bottom of the top material rack (31). The telescopic end of the hydraulic cylinder (32) faces downward and is fixedly connected to the bottom of the bottom mold (29). The top material rack (31) has two horizontal square mounting grooves (33) at the top.

4. The anti-cracking stretch die for an automobile part according to claim 3, wherein: The demolding and material transfer unit (3) also includes a lifting slide (34), a hydraulic cylinder (35) and a feeding roller (36). The lifting slide (34) is slidably connected inside the mounting groove (33). The lifting slide (34) has a U-shaped structure and a feeding roller (36) is rotatably connected to the inner side of the upper end. A power motor and a transmission belt are embedded inside the lifting slide (34). The power motor drives the upper feeding roller (36) to rotate through the transmission belt. A hydraulic cylinder (35) is installed at the bottom of the lifting slide (34) and at the position corresponding to the mounting groove (33). The telescopic end of the hydraulic cylinder (35) faces upward and is fixedly connected to the bottom of the lifting slide (34).

5. The anti-cracking tensile mold for automotive parts according to claim 4, characterized in that: The demolding and material transfer unit (3) also includes rubber strips (37). Multiple rubber strips (37) are fixedly connected in a circumferential array on the outer side of the feeding roller (36). The rubber strips (37) are arranged horizontally, and half of them are stuck in the slots on the outer side of the feeding roller (36).

6. The anti-cracking stretch die for an automobile part according to claim 1, wherein: It also includes a retaining ring (4) and a countersunk hole (5). The countersunk hole (5) is provided at the four corners of the lower end of the fixed hanging plate (1). The retaining ring (4) is fixedly connected to the middle side of the lower end of the fixed hanging plate (1). The retaining ring (4) is clamped to the upper end of the hydraulic cylinder (21).

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