A deep drawing die with hydraulic booster

Abstract

This utility model belongs to the field of deep drawing die technology and discloses a deep drawing die with hydraulic booster. It includes a base, a top plate fixedly connected to the top of the base, a first hydraulic cylinder fixedly connected to the top of the top plate, a pressure plate fixedly connected to the output end of the first hydraulic cylinder, and a drawing block fixedly connected to the bottom of the pressure plate. Both the pressure plate and the drawing block are located below the top plate. In this utility model, a circulating cooling system constructed by a chiller, conduit, telescopic hose, inlet pipe and outlet pipe can directly deliver coolant to the interior of the drawing block, and remove the local high temperature generated by the plastic deformation of the metal during the deep drawing process in real time. This can avoid problems such as decreased hardness and accelerated surface wear of the drawing block due to long-term high temperature. At the same time, it prevents the high temperature from being conducted to the output end of the first hydraulic cylinder through the pressure plate, protects the internal seals of the hydraulic cylinder, reduces the risk of hydraulic oil deterioration, and significantly extends the service life and overhaul interval of core components such as the drawing block and the first hydraulic cylinder.

Description

Technical Field

[0001] This utility model relates to the field of stretching die technology, specifically to a deep stretching die with hydraulic booster. Background Technology

[0002] In the automotive manufacturing industry, the production of automotive parts (such as automotive body panels, door inner panels, fuel tank shells, chassis brackets, etc.) often requires deep drawing processes, which use molds to plastically deform metal sheets.

[0003] Chinese Patent Publication No. CN214601403U discloses a stretching die, including an upper fixed seat, a lower fixed seat, an upper template disposed on the upper fixed seat, and a lower template disposed on the lower fixed seat. Mounting seats are provided on opposite sides of both the upper and lower fixed seats. A T-slot is provided at one end of each mounting seat. T-blocks are slidably disposed within the T-slots on both the upper and lower templates. A fixing mechanism for fixing the T-blocks is provided on each mounting seat.

[0004] However, in the aforementioned patents, due to the lack of a cooling mechanism, high-strength steel plates commonly used in the deep drawing process of automotive parts, such as hot-formed steel and aluminum alloys, generate a large amount of localized high temperature during plastic deformation. The heat is mainly concentrated in the critical areas where the upper and lower molds contact the workpiece, similar to the stretching block and lower mold parts in the subsequent design of this patent. If there is no cooling mechanism, relying solely on the mold's own heat dissipation will cause the mold to remain in a high-temperature state for a long time. The surface hardness of the mold will decrease as the temperature rises, and the wear rate will accelerate. For automotive body panels and other parts that require frequent stretching, the mold replacement cycle will be significantly shortened, which will not only increase the mold maintenance cost but also reduce production efficiency due to frequent downtime for parts replacement. Based on this, this utility model designs a deep drawing mold with hydraulic booster to solve the above problems. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a deep drawing die with hydraulic booster.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A deep drawing die with hydraulic booster includes a base, a top plate fixedly connected to the top of the base, a first hydraulic cylinder fixedly connected to the top of the top plate, a pressure plate fixedly connected to the output end of the first hydraulic cylinder, a drawing block fixedly connected to the bottom of the pressure plate, the pressure plate and the drawing block being located below the top plate, and an inlet pipe and an outlet pipe fixedly connected to the two sides above the pressure plate, the lower ends of the inlet pipe and the outlet pipe communicating with the interior of the drawing block.

[0007] Furthermore, both the inlet and outlet pipes are fixedly connected to a flexible hose, and the ends of the two flexible hoses away from the pressure plate are fixedly connected to a conduit.

[0008] Furthermore, a chiller is installed above the top plate, and the ends of the two conduits furthest from the telescopic hose are fixedly connected to the input and output ends of the chiller, respectively.

[0009] Furthermore, a lower mold is fixedly connected to the top of the base, and a release mold is slidably connected to the middle of the interior of the lower mold.

[0010] Furthermore, a second hydraulic cylinder is fixedly connected to the top of the base, and the output end of the second hydraulic cylinder is fixedly connected to the bottom of the demolding template.

[0011] Furthermore, both sides of the interior of the lower mold are slidably connected with a demolding rod and a driving rod, with the demolding rod located below the stretching block and the driving rod located below the pressure plate.

[0012] Furthermore, the demolding rod and drive rod are fixedly connected to a mounting plate at one end located outside the lower mold.

[0013] Furthermore, springs are fitted onto the outer walls of both the demolding rod and the drive rod, with the springs located between the mounting plate and the lower mold. Beneficial effects

[0014] In this invention, a circulating cooling system constructed by a chiller, conduit, telescopic hose, inlet pipe, and outlet pipe can directly deliver coolant to the interior of the drawing block, thereby removing the localized high temperatures generated by the plastic deformation of the metal during deep drawing. This avoids problems such as decreased hardness and increased surface wear in the drawing block due to prolonged high temperatures. At the same time, it prevents high temperatures from being conducted to the output end of the No. 1 hydraulic cylinder through the pressure plate, protects the internal seals of the hydraulic cylinder, reduces the risk of hydraulic oil deterioration, and significantly extends the service life and overhaul interval of core components such as the drawing block and the No. 1 hydraulic cylinder.

[0015] In this invention, when a workpiece gets stuck inside the lower mold due to forming deviation, material adhesion, or other problems, and cannot be removed by the demolding rod alone, the output pressure of the second hydraulic cylinder can be gradually increased to drive the demolding platen to provide a stronger pushing force. Combined with the auxiliary action of the demolding rod and the drive rod, the adhesion resistance can be overcome to achieve emergency demolding. This design avoids equipment downtime, mold damage, or workpiece scrapping caused by mold jamming, significantly improves the mold's ability to cope with sudden failures, and ensures production continuity.

[0016] In this invention, the telescopic hose can flexibly extend and retract with the up-and-down movement of the pressure plate driven by the No. 1 hydraulic cylinder, avoiding the problems of loosening and breakage of the interface caused by the pulling of traditional rigid pipes, ensuring that the cooling system operates continuously and stably throughout the entire working process of the mold, without the risk of coolant leakage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a partial structural breakdown diagram of the present invention; Figure 4 This is a schematic diagram showing the connection relationship between the drive rod and the demolding rod of this utility model and the mounting plate; Figure 5 for Figure 3 A magnified structural diagram of region A in the middle.

[0019] The labels in the diagram represent: 1. Base; 11. Top plate; 12. Hydraulic cylinder No. 1; 13. Pressure plate; 14. Stretching block; 15. Water inlet pipe; 150. Water outlet pipe; 16. Telescopic hose; 17. Conduit; 18. Chiller; 19. Lower mold; 2. Hydraulic cylinder No. 2; 21. Demolding plate; 22. Mounting plate; 23. Demolding rod; 24. Drive rod; 25. Spring. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0021] The present invention will be further described below with reference to the embodiments.

[0022] In some embodiments, please refer to the appendix to the instruction manual. Figures 1-5A deep drawing die with hydraulic booster includes a base 1, a top plate 11 fixedly connected above the base 1, a first hydraulic cylinder 12 fixedly connected above the top plate 11, a pressure plate 13 fixedly connected to the output end of the first hydraulic cylinder 12, a drawing block 14 fixedly connected below the pressure plate 13, both the pressure plate 13 and the drawing block 14 being located below the top plate 11, an inlet pipe 15 and an outlet pipe 150 fixedly connected to the two sides above the pressure plate 13 respectively, the lower ends of the inlet pipe 15 and the outlet pipe 150 communicating with the interior of the drawing block 14, a telescopic hose 16 fixedly connected above the inlet pipe 15 and the outlet pipe 150, and a conduit 17 fixedly connected to the end of each of the two telescopic hoses 16 away from the pressure plate 13, a chiller 18 installed above the top plate 11, and the ends of the two conduits 17 away from the telescopic hoses 16 fixedly connected to the input end and the output end of the chiller 18 respectively.

[0023] In this embodiment, through the circulation channel constructed by the inlet pipe 15 and the outlet pipe 150, the coolant output by the chiller 18 can directly enter the interior of the drawing block 14, and carry away the local high temperature generated by the plastic deformation of the metal during the deep drawing process in real time. Compared with traditional molds without active cooling, it can avoid problems such as material hardness reduction and surface wear aggravation caused by long-term high temperature of the drawing block 14, significantly extend the replacement cycle of the drawing block 14, and reduce mold maintenance costs and downtime for parts replacement. When the coolant circulates within the stretching block 14, it can indirectly cool the pressure plate 13, preventing the pressure plate 13 from deforming due to heat and affecting the connection accuracy with the stretching block 14; at the same time, it prevents high temperature from being conducted to the output end of the first hydraulic cylinder 12 through the pressure plate 13, ensuring the stability of the internal seals of the first hydraulic cylinder 12, reducing the risk of hydraulic oil deterioration due to high temperature, and extending the overhaul interval of the first hydraulic cylinder 12. The inlet pipe 15 and outlet pipe 150 are symmetrically distributed on both sides of the pressure plate 13 and are directly connected to the inside of the stretching block 14. This ensures that the coolant flows evenly within the stretching block 14, avoiding uneven tensile stress on the workpiece caused by local temperature differences. Especially for materials such as stainless steel and aluminum alloys that are prone to cracking and wrinkling due to temperature fluctuations, this effectively reduces the defect rate of workpieces and ensures the dimensional accuracy and surface flatness of each workpiece in mass production. The telescopic hose 16 connected above the inlet pipe 15 and outlet pipe 150 can flexibly extend and retract with the up and down movement of the pressure plate 13 driven by the first hydraulic cylinder 12. This avoids the problem of loosening and breaking of the interface caused by the movement of traditional rigid pipes, ensuring that the cooling system operates continuously and stably throughout the entire working stroke of the mold, with no risk of coolant leakage.

[0024] In some embodiments, please refer to the appendix to the instruction manual. Figures 1-5A deep drawing die with hydraulic booster is provided. A lower die 19 is fixedly connected to the upper part of the base 1. A demolding plate 21 is slidably connected to the middle part of the lower die 19. A second hydraulic cylinder 2 is fixedly connected to the upper part of the base 1. The output end of the second hydraulic cylinder 2 is fixedly connected to the lower part of the demolding plate 21. Demolding rods 23 and driving rods 24 are slidably connected to both sides of the interior of the lower die 19. The demolding rods 23 are located below the drawing block 14, and the driving rods 24 are located below the pressure plate 13. An installation plate 22 is fixedly connected to one end of the demolding rods 23 and the driving rods 24 outside the lower die 19. Springs 25 are sleeved on the outer walls of the demolding rods 23 and the driving rods 24. The springs 25 are located between the installation plate 22 and the lower part of the lower die 19.

[0025] In this embodiment, the second hydraulic cylinder 2 fixed above 1 directly provides driving force to the demolding template 21 inside the lower mold 19. It can not only adapt to the demolding requirements of workpieces of different thicknesses and materials under normal working conditions, but also play a key role in special fault scenarios. When the workpiece is stuck inside the lower mold 19 due to forming deviation, local adhesion and other problems, and demolding cannot be achieved by pushing with the demolding rod 23 alone, the second hydraulic cylinder 2 can be started. Its adjustable and stable output pressure can be used to drive the demolding template 21 to be pushed upward from the bottom of the workpiece as a whole. Compared with the traditional structure that relies on a single demolding component, it effectively avoids equipment downtime, mold damage and even workpiece scrap caused by workpiece jamming, and significantly improves the mold's ability to cope with sudden failures.

[0026] Working principle: The operator places the metal billet to be stretched above the cavity of the lower mold 19, ensuring that the center of the billet is aligned with the center of the stretching block 14 and the stripping mold 21, thus completing the workpiece positioning. Start the first hydraulic cylinder 12, and its output end extends downward, driving the pressure plate 13 and the stretching block 14 to move downward synchronously. As the stretching block 14 gradually contacts the blank and continues to press down, the blank gradually undergoes plastic deformation under the extrusion of the stretching block 14 and the constraint of the cavity of the lower mold 19, and conforms to the inner wall of the cavity of the lower mold 19 to form the target shape such as a deep cylindrical shape or a curved surface. While the stretching block 14 is pressed down, the chiller 18 above the top plate 11 is started. The coolant output by the chiller 18 flows into the telescopic hose 16 through the output end conduit 17, and then enters the flow channel inside the stretching block 14 through the inlet pipe 15. The coolant circulates inside the stretching block 14, absorbs the local high temperature generated by the plastic deformation of the billet, and then flows back to the input end of the chiller 18 through the outlet pipe 150, another set of telescopic hoses 16 and conduit 17 to complete the cooling cycle. During this process, the telescopic hose 16 flexibly extends and retracts with the up and down movement of the pressure plate 13 to avoid pipe pulling and breakage, ensure the continuous and stable operation of the cooling system, and prevent the stretching block 14 from experiencing a decrease in hardness or surface wear due to high temperature. After the blank is stretched into the target workpiece, the output end of the first hydraulic cylinder 12 is controlled to retract upward, which drives the pressure plate 13 and the stretching block 14 to reset upward and separate from the workpiece surface. Start hydraulic cylinder 2, its output end extends upward, driving the stripping plate 21 to slide upward inside the lower mold 19. After the stripping plate 21 contacts the bottom of the workpiece, it pushes the workpiece upward, and at the same time drives the workpiece to move upward. As the demolding template 21 continues to push upward, the bottom of the workpiece exerts an upward thrust on the demolding rod 23, causing the demolding rod 23 to slide upward inside the lower mold 19. Its lower end drives the mounting plate 22 to move upward synchronously. The spring 25 is compressed due to the relative movement between the mounting plate 22 and the lower mold 19. The demolding rod 23 pushes upward against the high adhesion area of ​​the stretching block 14 at the bottom of the workpiece, assisting in the separation of the workpiece from the inner wall of the cavity of the lower mold 19. At the same time, the drive rod 24 slides upward with the mounting plate 22, pushing the edge of the workpiece to reduce the frictional resistance between the edge of the workpiece and the inner wall of the lower mold 19, ensuring that the workpiece is smoothly ejected from the cavity of the lower mold 19. After the workpiece is completely separated from the lower mold 19, the operator removes the formed workpiece, completing the routine demolding. If the workpiece gets stuck inside the cavity of the lower mold 19 due to forming deviations such as excessive thickness in some areas or material adhesion such as metal adhesion to the inner wall of the mold at high temperatures, and cannot be removed by pushing with the demolding rod 23 alone, the second hydraulic cylinder 2 is activated and the second hydraulic cylinder 2 is kept in continuous output pressure. Its output end drives the demolding platen 21 to continue pushing the workpiece upward. By gradually increasing the output pressure of the second hydraulic cylinder 2, a stronger pushing force is provided to the demolding platen 21 to overcome the adhesion resistance between the workpiece and the inner wall of the lower mold 19.

[0027] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A deep drawing die with hydraulic booster, comprising a base (1), characterized in that: A top plate (11) is fixedly connected above the base (1). A hydraulic cylinder (12) is fixedly connected above the top plate (11). A pressure plate (13) is fixedly connected to the output end of the hydraulic cylinder (12). A tension block (14) is fixedly connected below the pressure plate (13). Both the pressure plate (13) and the tension block (14) are located below the top plate (11). A water inlet pipe (15) and a water outlet pipe (150) are fixedly connected to the two sides above the pressure plate (13). The lower ends of the water inlet pipe (15) and the water outlet pipe (150) are connected to the interior of the tension block (14).

2. The deep drawing die with hydraulic booster according to claim 1, characterized in that, Both the inlet pipe (15) and the outlet pipe (150) are fixedly connected to a telescopic hose (16), and both ends of the telescopic hose (16) away from the pressure plate (13) are fixedly connected to a conduit (17).

3. The deep drawing die with hydraulic booster according to claim 2, characterized in that, A chiller (18) is installed above the top plate (11), and the ends of the two conduits (17) away from the telescopic hose (16) are fixedly connected to the input end and the output end of the chiller (18), respectively.

4. The deep drawing die with hydraulic booster according to claim 1, characterized in that, A lower mold (19) is fixedly connected above the base (1), and a stripping template (21) is slidably connected in the middle of the lower mold (19).

5. The deep drawing die with hydraulic booster according to claim 4, characterized in that, A second hydraulic cylinder (2) is fixedly connected above the base (1), and the output end of the second hydraulic cylinder (2) is fixedly connected to the bottom of the stripping template (21).

6. The deep drawing die with hydraulic booster according to claim 5, characterized in that, The lower mold (19) has a demolding rod (23) and a driving rod (24) slidably connected on both sides inside. The demolding rod (23) is located below the stretching block (14), and the driving rod (24) is located below the pressure plate (13).

7. The deep drawing die with hydraulic booster according to claim 6, characterized in that, The demolding rod (23) and the drive rod (24) are fixedly connected to a mounting plate (22) at one end located outside the lower mold (19).

8. The deep drawing die with hydraulic booster according to claim 7, characterized in that, Springs (25) are fitted onto the outer walls of both the demolding rod (23) and the drive rod (24), and the springs (25) are located between the mounting plate (22) and the lower mold (19).

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