A supercharging device with multi-stage supercharging function and a hydroforming machine

Abstract

This utility model belongs to the field of molding and processing, specifically disclosing a pressure boosting device and a hydroforming machine with multi-stage pressure boosting function. The pressure boosting device includes an injection cylinder for conveying molding medium to the mold cavity and a pressure boosting cylinder for driving the injection cylinder. There are at least two pressure boosting cylinders, and each pressure boosting cylinder can independently drive the injection cylinder for pressure boosting. The piston rods of all pressure boosting cylinders are connected to the piston rod of the injection cylinder. During pressure boosting, a single pressure boosting cylinder independently drives the injection cylinder, or multiple pressure boosting cylinders jointly drive the injection cylinder, forming multiple pressure boosting ratio outputs. This utility model's multi-stage pressure boosting device, by setting multiple sets of pressure boosting cylinders and connecting the piston rods of all pressure boosting cylinders to the piston rod of the injection cylinder, and by selecting different pressure boosting cylinders and different combinations of pressure boosting cylinders to drive the injection cylinder, achieves multiple pressure boosting ratio outputs, thereby adapting to molding processes of different products and offering better applicability.

Description

Technical Field

[0001] This utility model belongs to the field of molding and processing, and specifically relates to a pressure boosting device with multi-stage pressure boosting function and a water expansion molding machine. Background Technology

[0002] The water expansion molding machine is an advanced manufacturing technology for producing hollow integral components using internal high-pressure forming. Its principle is to use a tube as a blank and water as a transmission medium. The two ends of the tube are sealed, and water with ultra-high pressure is injected into the tube, which generates pressure on the inner wall of the tube, so that the outer wall of the tube is completely pressed against the mold cavity, thereby obtaining the part of the desired shape.

[0003] In existing hydroforming machines, a common design employs a set of hydraulic cylinders driving an injection cylinder. Specifically, the hydraulic cylinder acts as the power source, providing driving force to the injection cylinder, which in turn injects high-pressure liquid into the workpiece. The liquid pressure causes the workpiece to undergo plastic deformation and conform to the mold cavity, thus achieving the desired shape and size. However, this design has a significant drawback: the pressure ratio between the hydraulic cylinder and the injection cylinder is fixed. The pressure ratio is a crucial parameter in the hydroforming process, determined by the ratio of the piston area of ​​the hydraulic cylinder to that of the injection cylinder. When the hydraulic cylinder and injection cylinder are a fixed pair, both have fixed piston areas, resulting in a constant area ratio and consequently a fixed pressure ratio. In actual operation, regardless of adjustments to the pressure input to the hydraulic cylinder, the final high pressure output by the injection cylinder is always the product of the hydraulic cylinder pressure and this fixed pressure ratio. If this fixed ratio cannot be overcome, it will be impossible to meet more diverse and higher-quality processing requirements. Therefore, it is necessary to improve existing hydroforming machines to solve this problem. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, this utility model provides a booster device with multi-stage boosting function. The booster device can drive the injection cylinder to achieve multiple boosting ratio outputs by selecting different booster cylinders and different combinations of booster cylinders.

[0005] The second objective of this utility model is to disclose a water expansion molding machine that uses the above-mentioned pressurization device.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is:

[0007] A pressure boosting device with multi-stage pressure boosting function includes an injection cylinder for conveying molding medium to a mold cavity and a pressure boosting cylinder for driving the injection cylinder to work; there are at least two pressure boosting cylinders and each pressure boosting cylinder can independently drive the injection cylinder to work for pressure boosting; wherein, the piston rods of all pressure boosting cylinders are connected to the piston rods of the injection cylinders;

[0008] During pressurization, a single pressurizing cylinder independently drives the injection cylinder, or multiple pressurizing cylinders jointly drive the injection cylinder, forming multiple pressurization ratio outputs.

[0009] Preferably, the booster cylinder is divided into two types: a main booster cylinder and a secondary booster cylinder.

[0010] Preferably, the piston cross-section of the auxiliary booster cylinder is smaller than that of the main booster cylinder.

[0011] Preferably, the auxiliary booster cylinder is used to drive the injection cylinder to work during the preforming stage, and the main booster cylinder is used to drive the injection cylinder to work during the shaping stage.

[0012] Preferably, the auxiliary booster cylinder is also used to drive the injection cylinder together with the main booster cylinder during the shaping stage.

[0013] Preferably, there are at least two sets of auxiliary booster cylinders.

[0014] Preferably, when there are two sets of auxiliary booster cylinders, the two sets of auxiliary booster cylinders are symmetrically arranged on both sides of the main booster cylinder.

[0015] Preferably, when there are more than two sets of auxiliary booster cylinders, the multiple sets of auxiliary booster cylinders are arranged in a circle at equal angles with the main booster cylinder as the center.

[0016] Preferably, it also includes a movable crossbeam for connecting the piston rod of the booster cylinder and the piston rod of the injection cylinder; the piston rods of multiple booster cylinders are all fixedly connected to the movable crossbeam; the piston rod of the injection cylinder is also fixedly connected to the movable crossbeam.

[0017] A hydroforming machine includes the aforementioned pressurizing device with multi-stage pressurization function.

[0018] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0019] 1. The booster device with multi-stage boosting function of this utility model is provided by setting multiple sets of booster cylinders, and the piston rods of all booster cylinders are connected to the piston rods of the injection cylinder; by selecting different booster cylinders and different combinations of booster cylinders to work, the injection cylinder is driven to achieve multiple boosting ratio outputs.

[0020] 2. The injection cylinder in the multi-stage pressurization device of this utility model can achieve multiple pressurization ratios, thereby adapting to the molding processes of different products and having better applicability. Attached Figure Description

[0021] Figure 1 This is a perspective view of the booster device with multi-stage boosting function according to this utility model.

[0022] Figure 2 and Figure 3 These are two perspective views of the hydroforming machine of this utility model. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] See Figure 1 The present invention provides a multi-stage pressurization device comprising an injection cylinder 4 for conveying molding medium to the mold cavity and a pressurization cylinder for driving the injection cylinder 4; there are at least two pressurization cylinders, and each pressurization cylinder can independently drive the injection cylinder 4 to perform pressurization; wherein, the piston rods of all pressurization cylinders are connected to the piston rods of the injection cylinder 4; during pressurization, a single pressurization cylinder independently drives the injection cylinder 4 or multiple pressurization cylinders jointly drive the injection cylinder 4 to form a multi-pressurization ratio output.

[0026] See Figure 1 The booster cylinders are divided into two types: a main booster cylinder 1 and an auxiliary booster cylinder 2. The auxiliary booster cylinder 2 is used to drive the injection cylinder 4 in the preforming stage, and the main booster cylinder 1 is used to drive the injection cylinder 4 in the shaping stage. In addition, the auxiliary booster cylinder 2 is also used to drive the injection cylinder 4 together with the main booster cylinder 1 in the shaping stage.

[0027] In this embodiment, the piston cross-section of the auxiliary booster cylinder 2 is smaller than that of the main booster cylinder 1;

[0028] In existing hydroforming machines, the molding process typically relies on a main hydraulic cylinder to drive the injection cylinder 4. To achieve sufficient pressure output during the shaping stage, ensuring the part is fully formed and fits tightly within the mold cavity, the piston cross-section of the main hydraulic cylinder is often designed to be large. This is based on the force calculation formula in a hydraulic system: F = P × A, where F is the output force, P is the system oil pressure, and A is the effective working area of ​​the piston. Since the system oil pressure is limited by the pressure resistance of components such as the hydraulic pump, pipelines, and seals, increasing the effective working area of ​​the piston becomes an effective way to achieve high pressure output. However, this design presents a significant contradiction in the secondary molding process. The secondary molding process includes two key stages: the pre-forming stage and the shaping stage, and the performance requirements of the main hydraulic cylinder differ significantly between these stages. In the preforming stage, excessive pressure is not required. The core requirement is to make the injection cylinder 4 work quickly to rapidly deliver the molding medium into the mold cavity. At this time, the pressure requirement of the molding medium is relatively low, and speed is more important. However, since the cylinder body of the main cylinder is relatively large, according to the cylinder movement speed formula V=Q / A, where V is the piston rod speed, Q is the flow rate of the input cylinder, and A is the effective area of ​​the piston, when the hydraulic oil flow rate of the input cylinder is constant, the larger the effective area of ​​the piston, the slower the piston rod movement speed. This causes the injection cylinder 4 to be unable to quickly complete the delivery of the molding medium in the preforming stage, which seriously affects the overall processing efficiency of the hydroforming machine.

[0029] Therefore, in this embodiment, the pressure cylinder is divided into a main pressure cylinder 1 and a secondary pressure cylinder 2. The secondary pressure cylinder 2 is used to drive the injection cylinder 4 to work in the pre-forming stage, and the main pressure cylinder 1 is used to drive the injection cylinder 4 to work in the shaping stage. The piston cross-section of the secondary pressure cylinder 2 is smaller than that of the main pressure cylinder 1. Therefore, the moving stroke speed of the piston rod of the secondary pressure cylinder 2 will be much greater than that of the main pressure cylinder 1. With the above settings, in the pre-forming stage, the secondary pressure cylinder 2 drives the injection cylinder 4 to work quickly, thereby rapidly sending the molding medium into the mold cavity. In the shaping stage, the main pressure cylinder 1 is activated, thereby driving the syringe to work slowly, thereby increasing the pressure in the molding medium to a set value, so that the product is fully formed.

[0030] In addition, the auxiliary booster cylinder 2 is also used to drive the injection cylinder 4 together with the main booster cylinder 1 during the shaping stage, which can further increase the booster ratio and thus increase the upper limit of the molding pressure of the water expansion molding machine of this utility model.

[0031] In addition, at each stage of product molding, the rodless chamber of the unused booster cylinder can be connected to the filling tank. In this way, when the piston rod of the injection cylinder 4 moves, the rodless chamber of the unused booster cylinder can vacuum oil, that is, the hydraulic oil in the filling tank is drawn into the rodless chamber.

[0032] See Figure 1 The auxiliary booster cylinder 2 comprises at least two sets; wherein,

[0033] When there are two sets of auxiliary booster cylinders 2, the two sets of auxiliary booster cylinders 2 are symmetrically arranged on both sides of the main booster cylinder 1;

[0034] When there are more than two sets of auxiliary booster cylinders 2, the multiple sets of auxiliary booster cylinders 2 are arranged in a circle with equal angles around the main booster cylinder 1.

[0035] The above settings allow the piston rod of injection cylinder 4 to be subjected to force balance.

[0036] See Figure 1 The booster device of this utility model with multi-stage boosting function also includes a movable crossbeam 3 for connecting the piston rod of the booster cylinder and the piston rod of the injection cylinder 4; the piston rods of multiple booster cylinders are all fixedly connected to the movable crossbeam 3; the piston rod of the injection cylinder 4 is also fixedly connected to the movable crossbeam 3; the advantage of setting the movable crossbeam 3 is:

[0037] (1) To achieve the connection between the piston rods of multiple booster cylinders and the piston rod of injection cylinder 4;

[0038] (2) Use a guide mechanism (e.g., a slide bar) to guide and limit the movement of the piston rods of multiple booster cylinders and the piston rods of the injection cylinder to improve stability.

[0039] In this embodiment, the piston rods of multiple sets of booster cylinders are all mounted on the upper surface of the movable crossbeam 3 via a first flange connector; correspondingly, the piston rod of the injection cylinder 4 is mounted on the lower surface of the movable crossbeam 3 via a second flange connector; both the first flange connector and the second flange connector are flanges; the flanges are mounted on the piston rods of the booster cylinder and the injection cylinder 4; the movable crossbeam 3 is provided with mounting holes for mounting the flanges.

[0040] Example 2

[0041] like Figure 2 and Figure 3 As shown, the water expansion molding machine of this utility model includes a frame, an expansion device mounted on the frame for expanding the product, and a pressurizing device for supplying high-pressure liquid to the expansion device. The expansion device includes a movable beam mounted on the frame, an upper mold, a lower mold, and a mold locking device for driving the upper mold to move downwards to lock the mold when the upper and lower molds are closed. The specific structure of the above device is implemented with reference to existing devices, while the pressurizing device is the pressurizing device described in Embodiment 1.

[0042] 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 booster device with multi-stage boosting function, comprising an injection cylinder for conveying molding medium to a mold cavity and a booster cylinder for driving the injection cylinder; characterized in that, The pressure boosting cylinder is at least two, and each pressure boosting cylinder can independently drive the injection cylinder to work and increase pressure; wherein, the piston rod of all pressure boosting cylinders is connected to the piston rod of the injection cylinder; During pressurization, a single pressurizing cylinder independently drives the injection cylinder, or multiple pressurizing cylinders jointly drive the injection cylinder, forming multiple pressurization ratio outputs.

2. The booster device with multi-stage boosting function according to claim 1, characterized in that, The booster cylinders are divided into two types: main booster cylinders and auxiliary booster cylinders.

3. The booster device with multi-stage boosting function according to claim 2, characterized in that, The piston cross-section of the auxiliary booster cylinder is smaller than that of the main booster cylinder.

4. The booster device with multi-stage boosting function according to claim 2, characterized in that, The auxiliary booster cylinder is used to drive the injection cylinder during the preforming stage, and the main booster cylinder is used to drive the injection cylinder during the shaping stage.

5. The booster device with multi-stage boosting function according to claim 4, characterized in that, The auxiliary booster cylinder is also used to drive the injection cylinder together with the main booster cylinder during the shaping stage.

6. The booster device with multi-stage boosting function according to claim 2, characterized in that, There are at least two sets of auxiliary booster cylinders.

7. The booster device with multi-stage boosting function according to claim 6, characterized in that, When there are two sets of auxiliary booster cylinders, the two sets of auxiliary booster cylinders are symmetrically arranged on both sides of the main booster cylinder.

8. The booster device with multi-stage boosting function according to claim 7, characterized in that, When there are more than two sets of auxiliary booster cylinders, the multiple sets of auxiliary booster cylinders are arranged in a circle at equal angles with the main booster cylinder as the center.

9. The booster device with multi-stage boosting function according to claim 1, characterized in that, It also includes a movable crossbeam for connecting the piston rod of the booster cylinder and the piston rod of the injection cylinder; the piston rods of multiple booster cylinders are all fixedly connected to the movable crossbeam; the piston rod of the injection cylinder is also fixedly connected to the movable crossbeam.

10. A water-expansion molding machine, characterized in that, The supercharger device with multi-stage supercharger function as described in any one of claims 1-9.

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