A high-efficiency supercharging device for water swelling forming and a pressure-reducing and flow-increasing water swelling forming machine

Abstract

The utility model discloses a kind of high-efficiency pressure-increasing device and pressure-reducing flow-increasing water-swelling forming machine for water-swelling forming, wherein, the high-efficiency pressure-increasing device includes pressure-reducing flow-increasing device and high-pressure supercharging device;The pressure-reducing flow-increasing device includes pressure cylinder and pressure cylinder;The pressure cylinder includes pressure cylinder body and the pressure component matched with the inner cavity of pressure cylinder body in pressure cylinder body;The pressure cylinder includes pressure cylinder body and the pressure component matched with the inner cavity of pressure cylinder body in pressure cylinder body;The pressure area of the pressure component is greater than or equal to the pressure area of the pressure component;The high-pressure supercharging device is used for continuously outputting pressure to pipe blank, to complete the deformation shaping of pipe blank or deformed pipe blank to final part in mould cavity.The high-efficiency pressure-increasing device of the utility model can realize the quick filling of forming medium in pipe blank, to improve the overall processing efficiency of pipe blank.

Description

Technical Field

[0001] This utility model belongs to the field of molding and processing, and specifically relates to a high-efficiency pressurizing device and a pressure-reducing and flow-increasing water expansion molding machine for water expansion molding. Background Technology

[0002] Hydraulic forming technology is an advanced plastic forming process that uses high-pressure liquid as the force transmission medium. It injects high-pressure liquid into the blank, causing the blank to expand and deform under the constraint of the mold and fit into the cavity, ultimately obtaining a part of the target shape. It has the advantages of high forming accuracy, simplified process, and high material utilization.

[0003] Currently, the high-pressure power system of mainstream water expansion machines is mostly composed of a low-pressure water supply pump and a high-pressure booster cylinder. The basic working process is as follows: First, low-pressure liquid is injected into the mold cavity and the cylinder body of the high-pressure cylinder through the low-pressure water supply pump to complete the filling and venting; then the high-pressure booster cylinder pressurizes the low-pressure liquid to provide the high-pressure power required for the deformation of the billet, and finally realizes the forming of the part.

[0004] The hydroforming process involves three stages: medium filling, pressure deformation, and high-pressure shaping. The core objective of the medium filling and pressure deformation stages is to rapidly deform the tube blank by outputting a forming medium that meets the pressure requirements, maximizing the deformation to closely approximate the final shaping needs. This stage is characterized by large deformation but relatively low pressure requirements. The high-pressure shaping stage, on the other hand, shapes the edges and corners, characterized by small deformation but higher pressure requirements. In existing hydroforming intensifiers, to ensure the maximum pressure required in the shaping stage, the intensifier needs to pressurize the forming medium. However, in the deformation stage, the flow rate of the forming medium is even higher. That is, under the premise of meeting pressure requirements, the larger the flow rate of the forming medium, the higher the tube blank deformation efficiency. This characteristic is particularly suitable for the forming needs of tubes with large deformation amounts. However, existing intensifier cylinders require a relatively small output flow rate of the deformation medium in the deformation stage under the same power source, and the larger the pressure ratio, the smaller the flow rate, becoming a key factor restricting the production efficiency of hydroforming.

[0005] Therefore, how to increase the flow output of the molding medium without changing the final pressure source has become a core technical problem that needs to be solved to improve the production efficiency of hydroforming. Utility Model Content

[0006] In order to overcome the shortcomings of the existing technology, this utility model provides a high-efficiency pressurizing device for water expansion molding. The high-efficiency pressurizing device can quickly fill the molding medium in the tube blank, thereby improving the overall processing efficiency of the tube blank.

[0007] The second objective of this utility model is to provide a pressure-reducing and flow-increasing hydroforming machine.

[0008] The technical solution of this utility model to solve the above-mentioned technical problems is:

[0009] A high-efficiency pressurizing device for hydroforming includes a pressure-reducing and flow-increasing device and a high-pressure pressurizing device, wherein...

[0010] The pressure-reducing and flow-increasing device is used to rapidly inject a forming medium into the tube blank at its maximum working pressure. The device includes a pressure-receiving cylinder and a pressure-applying cylinder. The pressure-receiving cylinder includes a pressure-receiving cylinder body and a pressure-receiving component disposed within the pressure-receiving cylinder body and matching the inner cavity of the pressure-receiving cylinder body. The pressure-receiving cross-sectional area of ​​the pressure-receiving component is greater than or equal to the pressure-applying cross-sectional area of ​​the pressure-applying component.

[0011] The high-pressure booster device is used to continuously output pressure into the tube blank to complete the deformation and shaping of the tube blank in the mold cavity or the deformed tube blank into the final part.

[0012] Preferably, the pressure-reducing and flow-increasing device is used to provide pressure during the pre-forming stage of the tube blank; the high-pressure boosting device is used to provide pressure during the shaping stage of the tube blank; wherein, the working pressure of the high-pressure boosting device is greater than the maximum working pressure of the pressure-reducing and flow-increasing device.

[0013] Preferably, the high-pressure boosting device and the pressure-reducing and flow-increasing device are in parallel. The high-pressure boosting device consists of an injection cylinder and a drive cylinder for driving the injection component in the injection cylinder. The drive component of the drive cylinder is connected to the injection component of the injection cylinder. The inner cross-sectional area of ​​the drive cylinder in the boosting device is larger than the inner cross-sectional area of ​​the injection cylinder.

[0014] Preferably, when the injection cylinder in the high-pressure boosting device and the pressure-receiving cylinder in the pressure-reducing and flow-increasing device are integrated into one unit, the pressure-applying cylinder in the pressure-reducing and flow-increasing device and the drive cylinder in the boosting device have a cylinder-within-a-cylinder structure; the high-pressure boosting device includes the drive cylinder; the pressure-applying cylinder is disposed in the drive assembly of the drive cylinder, and the pressure-applying assembly of the pressure-applying cylinder is connected to the cylinder body of the drive cylinder; the drive assembly of the drive cylinder is connected to the pressure-receiving assembly of the pressure-receiving cylinder.

[0015] Preferably, when the injection cylinder in the high-pressure boosting device and the pressure-receiving cylinder in the pressure-reducing and flow-increasing device are integrated into one unit, the pressure-applying cylinder in the pressure-reducing and flow-increasing device and the driving cylinder in the boosting device are multiple sets of parallel structures.

[0016] Preferably, the pressure reducing and flow increasing device is in multiple sets, and the ratio of the inner cross-sectional area of ​​the pressure applying cylinder to the inner cross-sectional area of ​​the pressure receiving cylinder in the multiple sets of pressure reducing and flow increasing devices is different.

[0017] Preferably, the high-pressure booster device is also in multiple sets, and the ratio of the inner cross-sectional area of ​​the drive cylinder to the inner cross-sectional area of ​​the injection cylinder in the multiple sets of high-pressure booster devices is different.

[0018] Preferably, the pressure cylinder is in multiple sets, which can be in the form of a cylinder within a cylinder or in the form of multiple parallel cylinders.

[0019] Preferably, the drive cylinder is in multiple groups, and the multiple groups of drive cylinders are in the form of cylinder-in-cylinder or multi-stage parallel cylinder.

[0020] A pressure-reducing and flow-boosting hydro-expansion molding machine includes a frame, a molding die mounted on the frame, a water supply device, a high-efficiency pressure boosting device for hydro-expansion molding, and a control device.

[0021] The water replenishment device is used to inject molding medium into the cavity of the molding mold;

[0022] The water inlet of the mold cavity is connected to the water outlet of the water supply device, the pressure reducing and flow increasing device and the high pressure increasing device through a pipeline.

[0023] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0024] 1. The pressure-reducing and flow-increasing hydroforming machine of this utility model adopts a pressure-reducing and flow-increasing device. Relying on the characteristic that the inner cross-sectional area of ​​the pressure-applying cylinder is smaller than that of the pressure-receiving cylinder, when the pressure-applying component of the pressure-applying cylinder drives the pressure-receiving component of the pressure-receiving cylinder to move, the forming medium in the pressure-receiving cylinder can be injected into the cavity of the forming mold more quickly, thereby realizing the rapid filling of the tube blank with the forming medium and improving the overall processing efficiency of the tube blank.

[0025] 2. The pressure-reducing and flow-increasing device in the pressure-reducing and flow-increasing hydroforming machine of this utility model can inject more forming medium into the cavity of the forming mold within the same unit time based on the same input power. The high-pressure boosting device is used to continuously output pressure to complete the deformation and shaping power of the tube blank or deformed tube blank in the mold cavity to the final part, so as to realize the final forming of the workpiece. Therefore, the combination of the pressure-reducing and flow-increasing device and the high-pressure boosting device not only meets the pressure requirements of workpiece processing deformation, but also meets the requirements of production efficiency, realizing the high-efficiency production of workpiece hydroforming. Attached Figure Description

[0026] Figure 1 and Figure 2 These are two structural schematic diagrams from different perspectives illustrating the first specific embodiment of the pressure-reducing and flow-increasing hydroforming machine of this utility model.

[0027] Figure 3 This is a simplified structural diagram.

[0028] Figure 4 for Figure 3 Piping diagram for the first connection method.

[0029] Figure 5 for Figure 3 Piping diagram for the second connection method.

[0030] Figure 6 for Figure 3 Piping diagram for the third connection method.

[0031] Figure 7 for Figure 3 Piping diagram for the fourth connection method.

[0032] Figure 8 and Figure 9 These are two structural schematic diagrams from different perspectives illustrating the second specific embodiment of the pressure-reducing and flow-increasing hydroforming machine of this utility model.

[0033] Figure 10 This is a schematic diagram of a voltage reduction and flow booster device.

[0034] Figure 11 This is a structural schematic diagram of the third specific embodiment of the pressure-reducing and flow-increasing hydro-expansion molding machine of this utility model.

[0035] Figure 12 This is a schematic diagram of a high-efficiency booster device.

[0036] In the diagram: 1-Pressure cylinder; 2-Pressure-receiving cylinder; 3-Pressure-reducing and flow-increasing device; 4-High-pressure boosting device; 5-Cavity; 6-Drive cylinder; 7-Injection cylinder; 8-Water replenishment pump; 9-Oil pump; 10-Frame; 11-Molding die; 12-Mounting base. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0038] Example 1

[0039] See Figures 1-2 The pressure-reducing and flow-increasing hydroforming machine of this utility model includes a frame, a forming mold mounted on the frame, a water replenishment device, a pressure-reducing and flow-increasing device, a high-pressure boosting device, and a control device.

[0040] See Figures 1-2 The water replenishment device is used to inject molding medium into the cavity of the molding mold. The water replenishment device can be a water replenishment pump, such as a gear pump.

[0041] See Figures 1-2The pressure-reducing and flow-increasing device includes a pressure-receiving cylinder and a pressure-applying cylinder. The pressure-receiving cylinder includes a pressure-receiving cylinder body and a pressure-receiving component disposed within the pressure-receiving cylinder body and matching the inner cavity of the pressure-receiving cylinder body. The pressure-receiving cross-sectional area of ​​the pressure-receiving component is greater than or equal to the pressure-applying cross-sectional area of ​​the pressure-applying component. The pressure-receiving cross-sectional area is the inner cross-sectional area of ​​the pressure-receiving cylinder body. The pressure-applying cross-sectional area is the inner cross-sectional area of ​​the pressure-applying cylinder body. Hydraulic oil is continuously input into the pressure-applying cylinder body via a power output unit (oil pump), driving the pressure-applying component within the pressure-applying cylinder body to move, thereby synchronously compressing the forming medium (e.g., water) within the pressure-receiving cylinder body and causing the forming medium in the pressure-receiving cylinder body to be continuously extruded. The stroke of the pressure-applying component is equal to the compression stroke of the forming medium within the pressure-receiving cylinder body. The output flow rate of the forming medium in the pressure-receiving cylinder body is greater than or equal to the input flow rate of the hydraulic oil in the pressure-applying cylinder body. The specific principle is as follows:

[0042] Based on the power conservation formula for hydraulic systems (input power W1 of the pressure cylinder = output power W2 of the pressure-receiving cylinder), where power W = flow rate Q × pressure F, the power conservation formula for hydraulic systems can be expressed as:

[0043] Input flow rate Q1 × input pressure F1 = output flow rate Q2 × output pressure F;

[0044] Where, flow rate Q = cylinder cross-sectional area (i.e., equivalent to the pressurizing / receiving piston) A × piston stroke H;

[0045] Therefore, when the working strokes of the pressure-applying cylinder and the pressure-receiving cylinder are the same, the output flow rate Q2 will inevitably increase when the pressure-receiving cross-sectional area A2 of the pressure-receiving component increases. Therefore, this utility model designs the pressure-receiving cross-sectional area of ​​the pressure-receiving component to be larger than the pressure-applying cross-sectional area of ​​the pressure-applying component, so that the output flow rate of the pressure-receiving cylinder can be greater than the input flow rate of the pressure-applying cylinder, thereby realizing the amplification and conversion of flow rate.

[0046] In this embodiment, the power output unit is a delivery pump, and the working pressure of the first fluid medium is the working pressure of the delivery pump.

[0047] The ratio of the pressure-receiving cross-sectional area of ​​the pressure-applying cylinder to the pressure-applying cylinder is equal to the ratio of the working pressure of the hydraulic oil to the maximum pressure of the forming medium. This allows the output flow rate of the forming medium to be maximized while meeting the maximum pressure requirements of the forming medium, thereby maximizing the filling speed of the forming medium.

[0048] See Figures 1-2The high-pressure booster consists of an injection cylinder and a drive cylinder for driving the injection component in the injection cylinder; the drive component of the drive cylinder is connected to the injection component of the injection cylinder; the inner cross-sectional area of ​​the drive cylinder in the booster is greater than or equal to the inner cross-sectional area of ​​the injection cylinder.

[0049] See Figures 1-2 The water inlet of the cavity of the molding die is connected to the water supply device, the pressure cylinder and the injection cylinder through a pipeline.

[0050] See Figures 1-2 The outlet of the water replenishment device is also connected to the inlet of the pressure cylinder and the injection cylinder.

[0051] See Figures 1-2 The pressure receiving component, pressure applying component, driving component and injection component are all piston components or plunger components, wherein the piston component consists of a piston rod and a piston disposed on the piston rod, and the plunger component is a plunger rod.

[0052] See Figures 1-2 The high-pressure boosting device and the voltage-reducing and current-boosting device are of parallel structure, meaning that both the high-pressure boosting device and the voltage-reducing and current-boosting device are independently installed.

[0053] The pressure-reducing and flow-increasing device consists of multiple sets, each with a different ratio between the inner cross-sectional area of ​​the pressure-applying cylinder and the inner cross-sectional area of ​​the pressure-receiving cylinder. Furthermore, each set of pressure-reducing and flow-increasing devices also contains multiple pressure-applying cylinders, which can be either cylinder-within-a-cylinder or multi-stage parallel cylinders. By setting multiple pressure-applying cylinders, each with a different pressure-applying cross-sectional area, different ratios can be formed with the pressure-receiving components, resulting in different flow amplification ratios. Depending on the maximum working pressure required by the molding medium, different pressure-applying cylinders can be selected for operation, allowing the pressure-reducing and flow-increasing device of this invention to be applicable to more working conditions and to achieve the highest possible filling efficiency of the molding medium.

[0054] The high-pressure booster device can also be in multiple sets, and the ratio of the inner cross-sectional area of ​​the drive cylinder to the inner cross-sectional area of ​​the injection cylinder in each of the multiple sets of high-pressure booster devices is different. In addition, each set of high-pressure booster devices also has multiple drive cylinders, which can be in the form of a cylinder within a cylinder or a multi-stage parallel cylinder. By setting multiple drive cylinders, and each of their drive components having a different pressure application cross-sectional area, different ratios can be formed with the injection component, resulting in different pressure amplification ratios. Depending on the maximum working pressure required by the molding medium, different drive cylinders can be selected to work, making the high-pressure booster device of this utility model applicable to more working occasions and achieving the highest possible filling pressure of the molding medium.

[0055] In this embodiment, the pressure cylinder body of the pressure cylinder is fixed, and the pressure application component drives the pressure receiving cylinder body or the pressure receiving component to move synchronously. When the pressure application component drives the pressure receiving cylinder body to move synchronously, it is necessary to ensure that the pressure receiving component is fixed on the frame; when the pressure application component drives the pressure receiving component to move synchronously, it is necessary to ensure that the pressure receiving cylinder body is fixed on the frame.

[0056] In addition to the above methods, the pressure-applying component of the pressure-applying cylinder is fixed, and the pressure-applying cylinder body drives the pressure-receiving cylinder body or the pressure-receiving component to move synchronously. When the pressure-applying cylinder body drives the pressure-receiving cylinder body to move synchronously, it is necessary to ensure that the pressure-receiving component is fixed on the frame; when the pressure-applying cylinder body drives the pressure-receiving component to move synchronously, it is necessary to ensure that the pressure-receiving cylinder body is fixed on the frame.

[0057] In addition, the drive cylinder and injection cylinder in the booster device can also be installed in the manner described above.

[0058] See Figures 1-2 The working principle of the pressure-reducing and flow-increasing hydro-expansion molding machine of this utility model is as follows:

[0059] Because the hydroforming process is divided into three filling stages, each stage is carried out by different devices working in sequence:

[0060] The first stage: The initial liquid filling of the mold blank tube is completed by the water replenishment device (such as the water replenishment pump), which lays the foundation for subsequent pressure forming;

[0061] The second stage involves switching to a pressure-reducing and flow-boosting device for filling. The core of this stage utilizes a "pressure-applying cylinder - pressure-receiving cylinder" structure to optimize pressure and flow transmission. In this stage, the pressure-applying cross-sectional area of ​​the pressure-applying cylinder is less than or equal to the pressure-receiving cross-sectional area of ​​the pressure-receiving cylinder. The pressure-applying medium is hydraulic oil, and the pressure-receiving medium is water. Leveraging this structure and medium characteristics, the flow rate of the pressure-receiving medium can be greater than or equal to the flow rate of the pump source (oil pump) input to the pressure-applying cylinder, and the upper limit of the pressure transmitted by the pressure-receiving medium is the maximum working pressure of the pump source. Specifically, the oil pump continuously inputs hydraulic oil into the pressure-applying cylinder, driving the pressure-receiving cylinder to squeeze water. This causes the water to be injected into the mold blank tube at a flow rate equal to or greater than the oil pump's output, and at a pressure equal to or less than the oil pump's pressure, maximizing the initial pressure within the tube blank—this pressure is higher than the output pressure of the water replenishment device and has a "can be greater than or less than" adaptive relationship with the minimum pressure of the high-pressure booster device. During this stage, the tube blank exists in only two states: either no deformation or deformation but not yet fully formed.

[0062] The third stage: Start the high-pressure booster device to continue filling until the tube blank fully meets the final forming requirements.

[0063] The above describes one of the working processes of the water expansion molding machine of this utility model. In addition, the water replenishment device, the pressure reducing and flow increasing device and the high pressure increasing device can operate synchronously. After reaching the set pressure, they can be shut down one after another. For example, after reaching the maximum pressure of the water replenishment device, the water replenishment device can be shut down. Through this "synchronous start and step-by-step shutdown" method, the work efficiency can be greatly improved.

[0064] The specific control process of this water expansion molding machine can be flexibly called and matched according to the actual situation to improve work efficiency.

[0065] See Figures 1-2 The pressure-reducing and flow-increasing device is used to provide pressure during the pre-forming stage of the tube blank (i.e., the "first stage and second stage" in the working principle); the high-pressure boosting device is used to provide pressure during the shaping stage of the tube blank (i.e., the "third stage" in the working principle); wherein, the working pressure of the high-pressure boosting device is greater than the maximum working pressure of the pressure-reducing and flow-increasing device.

[0066] Example 2

[0067] See Figures 3-7 The inlets of the pressure-reducing cylinder in the pressure-increasing device and the injection cylinder in the high-pressure boosting device are connected to the outlet of the water replenishment device, and the outlets are both connected to the cavity of the water-expanding forming mold; the outlet of the water replenishment device is also connected to the cavity of the water-expanding forming mold; in addition, the pressure-applying cylinder in the pressure-reducing device and the drive cylinder in the high-pressure boosting device are both connected to the oil pump through pipelines.

[0068] See Figures 3-7 The output pressure of the pressure-applying cylinder in the pressure-reducing and flow-increasing device is less than or equal to the output pressure of the drive cylinder in the high-pressure boosting device. Since the required pressure is relatively small in the initial stage of water expansion molding, when the scheme of "the output pressure of the pressure-applying cylinder in the pressure-reducing and flow-increasing device is less than the output pressure of the drive cylinder in the boosting device" is adopted, that is, when a low-power pressure-applying cylinder is used, it can help reduce production and implementation costs and avoid ineffective energy consumption during processing. On the other hand, when the scheme of "the output pressure of the pressure-applying cylinder in the pressure-reducing and flow-increasing device is equal to the output pressure of the drive cylinder in the high-pressure boosting device" is adopted, the specifications of the equipment parts can be standardized, which can significantly reduce procurement costs, simplify inventory management, shorten maintenance and replacement time, improve the universality and interchangeability of parts, and reduce the complexity of operation and maintenance.

[0069] The oil pump and the water supply pump can be one or two sets, specifically:

[0070] (1) The oil pump is a set, and the oil pump is connected to the pressure cylinder in the pressure reducing and flow increasing device and the drive cylinder in the pressure increasing device through pipelines;

[0071] (2) The oil pump consists of two sets, and the two sets of oil pumps are respectively connected to the pressure cylinder in the pressure reducing and flow increasing device and the drive cylinder in the pressure increasing device through pipelines.

[0072] (3) The water replenishment pump is a set; the inlets of the pressure-reducing cylinder in the pressure-increasing device and the injection cylinder in the pressure-increasing device are both connected to the outlet of the water replenishment pump; the outlet of the water replenishment pump is also connected to the cavity of the water expansion forming mold.

[0073] (4) The water replenishment pump is in two sets. The outlet of one set of water replenishment pump is connected to the inlet of the pressure cylinder in the pressure reducing and flow increasing device; the outlet of the other set of water replenishment pump is connected to the inlet of the injection cylinder in the pressure increasing device, and the outlet of one or both sets of water replenishment pumps is also connected to the cavity of the water expansion forming mold.

[0074] Of the four options above, option (1) can be combined with options (3) and (4), and option (2) can also be combined with options (3) and (4), resulting in four possible combinations; for example Figures 4-7 As shown, where, Figure 4 To combine scheme (2) and scheme (4), Figure 5 Scheme (1) and Scheme (4); Figure 6 This is a combination of scheme (1) and scheme (3). Figure 7 This is a combination of scheme (2) and scheme (3).

[0075] Example 3

[0076] See Figures 8-10 The difference between this embodiment and Embodiment 1 is that:

[0077] When the injection cylinder in the high-pressure boosting device and the pressure-receiving cylinder in the pressure-reducing and flow-increasing device are integrated into one unit, the pressure-applying cylinder in the pressure-reducing and flow-increasing device and the drive cylinder in the boosting device form a cylinder-within-a-cylinder structure; the high-pressure boosting device includes a drive cylinder; the pressure-applying cylinder is disposed in the drive assembly of the drive cylinder, and the pressure-applying assembly of the pressure-applying cylinder is connected to the cylinder body of the drive cylinder; the drive assembly of the drive cylinder is connected to the pressure-receiving assembly of the pressure-receiving cylinder; through the above arrangement, it is beneficial to reduce the volume of the water expansion molding machine of this utility model.

[0078] See Figures 8-10 The cylinder bodies of the pressure cylinder and the drive cylinder are integrated, which ensures that the coaxiality of the pressure application component of the pressure cylinder and the drive component of the drive cylinder meets the accuracy requirements, and also reduces the manufacturing and assembly difficulties.

[0079] See Figures 8-10The pressure cylinder and the drive cylinder are connected to the oil pump through pipelines. The oil pump can be one set or two sets. When there is one set of oil pumps, the oil pump is connected to the pressure cylinder and the drive cylinder through pipelines respectively. When there are two sets of oil pumps, the two sets of oil pumps are connected to the pressure cylinder and the drive cylinder through pipelines respectively.

[0080] Example 4

[0081] The difference between this embodiment and Embodiment 1 is that:

[0082] The upper and lower end faces of the injection cylinder are detachably mounted on the frame via mounting bases. By fixing the upper and lower ends of the injection cylinder body, the bending moment that may occur when using a single-sided fixing method is avoided, reducing the degree of bending deformation that may occur during operation, thereby reducing the amount of deformation of the injection cylinder. As a result, when the drive cylinder drives the piston / plunger assembly of the injection cylinder to work, the coaxiality between the injection cylinder body and the piston / plunger assembly can be guaranteed, thus avoiding one-sided contact and improving the stability of the injection cylinder during operation.

[0083] Furthermore, when both the pressure-reducing and flow-increasing devices and the high-pressure boosting device adopt a parallel structure, the upper and lower end faces of the pressure-receiving cylinder can be detachably mounted on the frame via mounting bases.

[0084] Example 5

[0085] See Figure 11 and Figure 12 The difference between this embodiment and Embodiment 1 is that:

[0086] When the injection cylinder in the high-pressure boosting device and the pressure-receiving cylinder in the pressure-reducing and flow-increasing device are integrated into one unit, the pressure-applying cylinder in the pressure-reducing and flow-increasing device and the driving cylinder in the boosting device are multiple sets of parallel structure.

[0087] The above are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A high-efficiency pressurizing device for hydroforming, characterized in that, Includes a step-down booster and a high-voltage booster, among which, The pressure-reducing and flow-increasing device is used to rapidly inject a forming medium into the tube blank at its maximum working pressure. The device includes a pressure-receiving cylinder and a pressure-applying cylinder. The pressure-receiving cylinder includes a pressure-receiving cylinder body and a pressure-receiving component disposed within the pressure-receiving cylinder body and matching the inner cavity of the pressure-receiving cylinder body. The pressure-receiving cross-sectional area of ​​the pressure-receiving component is greater than or equal to the pressure-applying cross-sectional area of ​​the pressure-applying component. The high-pressure booster device is used to continuously output pressure into the tube blank to complete the deformation and shaping of the tube blank in the mold cavity or the deformed tube blank into the final part.

2. The high-efficiency pressurizing device for hydroforming according to claim 1, characterized in that, The pressure-reducing and flow-increasing device is used to provide pressure during the pre-forming stage of the tube blank; the high-pressure boosting device is used to provide pressure during the shaping stage of the tube blank; wherein, the working pressure of the high-pressure boosting device is greater than the maximum working pressure of the pressure-reducing and flow-increasing device.

3. The high-efficiency pressurizing device for hydroforming according to claim 1, characterized in that, The high-pressure boosting device and the pressure-reducing and flow-increasing device are connected in parallel. The high-pressure boosting device consists of an injection cylinder and a drive cylinder for driving the injection component in the injection cylinder. The drive component of the drive cylinder is connected to the injection component of the injection cylinder. The inner cross-sectional area of ​​the drive cylinder in the boosting device is larger than the inner cross-sectional area of ​​the injection cylinder.

4. The high-efficiency pressurizing device for hydroforming according to claim 1, characterized in that, When the injection cylinder in the high-pressure boosting device and the pressure-receiving cylinder in the pressure-reducing and flow-increasing device are integrated into one unit, the pressure-applying cylinder in the pressure-reducing and flow-increasing device and the drive cylinder in the boosting device form a cylinder-within-a-cylinder structure; the high-pressure boosting device includes the drive cylinder; the pressure-applying cylinder is disposed in the drive assembly of the drive cylinder, and the pressure-applying assembly of the pressure-applying cylinder is connected to the cylinder body of the drive cylinder; the drive assembly of the drive cylinder is connected to the pressure-receiving assembly of the pressure-receiving cylinder.

5. The high-efficiency pressurizing device for hydroforming according to claim 1, characterized in that, When the injection cylinder in the high-pressure boosting device and the pressure-receiving cylinder in the pressure-reducing and flow-increasing device are integrated into one unit, the pressure-applying cylinder in the pressure-reducing and flow-increasing device and the driving cylinder in the boosting device are multiple sets of parallel structure.

6. The high-efficiency pressurizing device for hydroforming according to claim 1, characterized in that, The pressure reducing and flow increasing device consists of multiple sets, and the ratio of the inner cross-sectional area of ​​the pressure applying cylinder to the inner cross-sectional area of ​​the pressure receiving cylinder in each set of pressure reducing and flow increasing devices is different.

7. The high-efficiency pressurizing device for hydroforming according to claim 1, characterized in that, The high-pressure booster device is also in multiple sets, and the ratio of the inner cross-sectional area of ​​the drive cylinder to the inner cross-sectional area of ​​the injection cylinder in the multiple sets of high-pressure booster devices is different.

8. The high-efficiency pressurizing device for hydroforming according to any one of claims 1-7, characterized in that, The pressure cylinder is in multiple sets, which can be in the form of a cylinder within a cylinder or in the form of multiple parallel cylinders.

9. The high-efficiency pressurizing device for hydroforming according to claim 7, characterized in that, The drive cylinder is in multiple groups, and the multiple groups of drive cylinders are in the form of cylinder-in-cylinder or multi-stage parallel cylinder.

10. A pressure-reducing and flow-increasing hydro-expansion molding machine, characterized in that, The system includes a frame, a molding die mounted on the frame, a water supply device, a high-efficiency pressurizing device for hydroforming as described in any one of claims 1-9, and a control device, wherein... The water replenishment device is used to inject molding medium into the cavity of the molding mold; The water inlet of the mold cavity is connected to the water outlet of the water supply device, the pressure reducing and flow increasing device and the high pressure increasing device through a pipeline.

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