Multistage blank holder force device and hydraulic press

Abstract

The utility model relates to hydraulic equipment technical field, the utility model discloses multistage edge pressure device, include: bedplate, edge group, edge oil pump and edge die, the edge group includes edge oil cylinder and overflow valve, the edge oil cylinder is established on the bedplate, the edge oil cylinder is located the below of edge die, the output end of edge oil cylinder is upward to edge die, the overflow valve is established on the oil inlet end of edge oil cylinder, the quantity of edge group is three groups or more, the edge oil pump is established on the bedplate, and the edge oil pump is connected with edge oil cylinder drive, this multistage edge pressure device is through the configuration multiple edge groups, through the opening and closing of each group edge group's overflow valve, can make edge die provide different equal parts' edge pressure, improve the control precision of edge pressure.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic equipment technology, and in particular to a multi-stage pressing force device. Background Technology

[0002] In hydraulic stretching machines on the market, the blank holder cylinder, as a device that generates blank holder force, is indispensable in the stretching process.

[0003] In today's highly competitive market, it is common for multiple products and processes to share a single piece of equipment. Large stretching machines also have high pressure in their blank holder cylinders. General hydraulic systems suffer from problems such as low pressure control accuracy and pressure dead zones, making it difficult to provide precise small blank holder forces or extremely low blank holder forces using high-pressure blank holder cylinders. Utility Model Content

[0004] The present invention aims to improve at least one technical problem in the prior art.

[0005] This utility model provides a multi-stage blank holder force device, including: a base, a blank holder assembly, a blank holder oil pump, and a blank holder die;

[0006] The pressing assembly includes a pressing cylinder and an overflow valve. The pressing cylinder is mounted on the machine base and located below the pressing die. The output end of the pressing cylinder faces upward toward the pressing die. The overflow valve is located on the oil inlet end of the pressing cylinder. The number of pressing assemblies is three or more.

[0007] The pressing oil pump is mounted on the machine base and is driven by the pressing oil cylinder.

[0008] The beneficial effects of this utility model are as follows: By configuring multiple blank holder groups and controlling the opening and closing of the overflow valves of each blank holder group, the blank holder die can provide blank holder forces of different equal parts, thereby improving the control accuracy of the blank holder force.

[0009] As a sub-solution of the above technical solution, the multi-stage pressing force device also includes a controller, the overflow valve is an electrically controlled overflow valve, and the controller is signal-connected to the electrically controlled overflow valve.

[0010] As some sub-solutions of the above technical solution, it also includes a top plate and ejector pins. There are multiple ejector pins, the bottom ends of which are fixedly connected to the lower template, and the top ends of which are fixedly connected to the top plate.

[0011] As a sub-solution of the above technical solution, the multi-stage pressing force device further includes a buffer sleeve, which is located above the machine base and is fixed on the ejector pin.

[0012] As a sub-solution of the above technical solution, the ejector pin is provided with external threads, and the buffer sleeve is threadedly connected to the external threads.

[0013] This utility model also provides a hydraulic press, comprising:

[0014] The multi-stage blank holder force device described in any of the technical solutions;

[0015] A top frame, located above the base, is fixedly connected to the base;

[0016] The main cylinder is fixed on the top frame;

[0017] The upper template is driven by the master cylinder.

[0018] Since this hydraulic press includes the multi-stage pressing force device described in any of the above technical solutions, it also has corresponding beneficial effects. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the first embodiment of the multi-stage blank holder device of this utility model.

[0021] Figure 2 This is a schematic diagram of the structure of the second embodiment of the multi-stage blank holder of this utility model;

[0022] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0023] In the attached diagram: 1 - base;

[0024] 21-Edge pressing cylinder; 22-Relief valve;

[0025] 3-Edge pressing die;

[0026] 4-Emperor pin;

[0027] 5-Top plate;

[0028] 6-Buffer sleeve. Detailed Implementation

[0029] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0030] The following is combined with Figures 1 to 3 The embodiments of this utility model are described below.

[0031] This embodiment involves a multi-stage blank holder force device.

[0032] The multi-stage blank holder in this embodiment includes: a base 1, a blank holder assembly, a blank holder oil pump (not shown in the figure), and a blank holder die 3;

[0033] The pressing assembly includes a pressing cylinder 21 and an overflow valve 22. The pressing cylinder 21 is mounted on the machine base 1 and is located below the pressing die 3. The output end of the pressing cylinder 21 faces upward toward the pressing die 3. The overflow valve 22 is located on the oil inlet end of the pressing cylinder 21. The number of pressing assemblies is three or more.

[0034] The edge pressing oil pump is mounted on the machine base 1, and the edge pressing oil pump is driven and connected to the edge pressing oil cylinder 21.

[0035] This multi-stage blank holder device, by configuring multiple blank holder groups and controlling the opening and closing of the overflow valve 22 of each blank holder group, can enable the blank holder die 3 to provide blank holder forces of different equal parts, thereby improving the control accuracy of the blank holder force.

[0036] This multi-stage blank-pressing force device is used on a hydraulic press. Located on the press base 1, the device consists of a main cylinder pump and a blank-pressing pump. The blank-pressing pump drives the blank-pressing cylinder 21, while the main cylinder pump also drives the main cylinder of the hydraulic press. During operation, the main cylinder pump provides pressure to the main cylinder, and the blank-pressing pump provides pressure to the main cylinder. With all relief valves 22 closed, the sum of the blank-pressing forces of all blank-pressing cylinders 21 is the maximum blank-pressing force Fy, and the main cylinder pressure is Fz. Fz is greater than Fy, allowing the main cylinder to maintain downward pressure. With n blank-pressing groups, when k blank-pressing groups are selected, the blank-pressing force equals... Therefore, the more blank holders there are, the more precise the blank holder force can be controlled by selecting blank holders.

[0037] The multi-stage blank holder force device also includes a controller (not shown in the figure), and the overflow valve 22 is an electrically controlled overflow valve 22. The controller is signal-connected to the electrically controlled overflow valve 22. The overflow valve 22 is electrically controlled and controlled by the controller, allowing for convenient adjustment of the output pressure of the blank holder die 3. Furthermore, since this multi-stage blank holder force device is equipped with multiple blank holder groups with electrically controlled overflow valves 22, the adjustment accuracy is more precise when adjusting the blank holder force output by the entire device.

[0038] Furthermore, the controller is programmable to adapt to the processing requirements of sheets with different materials and thicknesses. Precise control of the blank holder force effectively prevents slippage or deformation of the sheet during stamping, thereby improving product processing quality and yield. The controller also has a fault diagnosis function, capable of monitoring the system status in real time. Upon detecting any abnormality, it immediately issues an alarm and takes corresponding measures to ensure the safe and stable operation of the equipment. Further, a pressure sensor is installed between the controller and the blank holder die 3 to monitor the actual pressure applied to the sheet by the blank holder die 3 in real time and feed this pressure value back to the controller. The controller compares the received pressure value with the actual set value and adjusts the opening of the electrically controlled overflow valve 22 through a closed-loop control algorithm, thereby achieving precise closed-loop control of the blank holder force.

[0039] This closed-loop control system not only improves the control precision of the blank holder force but also enhances the stability and reliability of the system. Even when the sheet thickness is uneven or the material properties change, the blank holder force can be quickly adjusted to ensure the smooth progress of the stamping process.

[0040] In addition, the multi-stage blank holder device also has a pressure curve recording function. The controller can record the change curve of the blank holder force during each stamping process, providing data support for subsequent process analysis and optimization. Operators can analyze the deformation of the sheet metal and the stamping effect based on the recorded pressure curve, thereby continuously optimizing the stamping process parameters and improving the overall product quality and production efficiency.

[0041] The multi-stage pressing device also includes a top plate 5 and multiple ejector pins 4. The bottom end of each ejector pin 4 is fixedly connected to the lower template, and the top end of each ejector pin 4 is fixedly connected to the top plate 5. The top plate 5 and the lower template are connected by the ejector pins 4.

[0042] This design allows the top plate 5 to evenly distribute pressure across the entire sheet metal. This structural design ensures that the sheet metal receives uniform blank holder force during stamping, thus avoiding damage caused by localized stress concentration. Simultaneously, the multi-point support structure of the ejector pin 4 improves the stability and durability of the entire device.

[0043] In the multi-stage blank holder device, the combined use of the top plate 5 and the ejector pin 4 makes the blank holder force distribution more uniform, which is crucial for improving the dimensional accuracy and surface quality of the stamped parts. In addition, the design of the top plate 5 and the ejector pin 4 also takes into account the convenience of replacement and maintenance, so that in actual production, operators can quickly replace the worn ejector pin 4, ensuring production efficiency.

[0044] Springs are provided between the top plate 5 and the ejector pin 4. These springs provide an upward force to the top plate 5, ensuring that the top plate 5 applies uniform pressure to the sheet metal during the stamping process. The surface of the top plate 5 is designed to match the contact surface of the sheet metal to reduce friction and damage to the sheet metal during the stamping process. In addition, the edges of the top plate 5 are designed with sealing strips to prevent hydraulic oil leakage and ensure the system's sealing and cleanliness.

[0045] The hydraulic press also includes a hydraulic system, which comprises a hydraulic pump, hydraulic cylinders, hydraulic lines, and hydraulic control valves. The hydraulic pump supplies hydraulic oil, and the hydraulic cylinders drive the top frame and upper template to move up and down via the hydraulic oil. The hydraulic lines connect the hydraulic pump and the hydraulic cylinders, and the hydraulic control valves control the flow and pressure of the hydraulic oil to achieve precise control of the movement of the hydraulic cylinders.

[0046] A pressure sensor is installed between the main cylinder and the upper die of the hydraulic press to monitor the pressure applied by the main cylinder to the upper die in real time and feed this pressure value back to the hydraulic press's control system. The control system compares the feedback pressure value with the set value and adjusts the flow and pressure of the hydraulic oil to achieve precise control of the main cylinder pressure, thereby ensuring the stability of the stamping process and the processing accuracy of the product.

[0047] The multi-stage blank holder device also includes a buffer sleeve 6, which is located above the base 1 and fixed to the ejector pin 4. When the blank holder cylinder retracts completely, the buffer sleeve 6 abuts against the top surface of the base 1, providing a buffering effect for the ejector pin 4 and reducing the impact force generated during the stamping process from damaging the top plate 5 and the ejector pin 4. The buffer sleeve 6 is typically made of a highly elastic material, capable of absorbing and dispersing pressure, thus extending the service life of the equipment.

[0048] To facilitate the engagement of the buffer sleeve 6 with the machine base 1 when the pressure cylinder is fully retracted, the ejector pin 4 is provided with external threads, and the buffer sleeve 6 is threadedly connected to these external threads. The position of the buffer sleeve 6 on the ejector pin 4 can be changed by rotating it, thus adapting to errors.

[0049] This utility model also provides a hydraulic press, comprising:

[0050] The multi-stage blank holder device described in any embodiment;

[0051] A top frame, which is located above the base 1 and is fixedly connected to the base 1;

[0052] The main cylinder is fixed on the top frame;

[0053] The upper template is driven by the master cylinder.

[0054] The hydraulic press's main cylinder and the pressing cylinder that drives the multi-stage pressing force device both employ conventional technologies in the field of hydraulic technology, which will not be elaborated upon here.

[0055] The preferred embodiments of the present invention have been described in detail above, but the present disclosure is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of the present disclosure.

[0056] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0057] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

Claims

1. A multi-stage blank holder device, characterized in that: include: Machine base (1), pressing assembly, pressing oil pump and pressing die (3); The pressing group includes a pressing cylinder (21) and an overflow valve (22). The pressing cylinder (21) is mounted on the machine base (1) and is located below the pressing die (3). The output end of the pressing cylinder (21) faces upward toward the pressing die (3). The overflow valve (22) is mounted on the oil inlet end of the pressing cylinder (21). The number of pressing groups is three or more. The pressing oil pump is mounted on the machine base (1) and is driven by the pressing oil cylinder (21).

2. The multi-stage blank holder force device according to claim 1, characterized in that: The multi-stage pressing force device also includes a controller, and the overflow valve (22) is an electrically controlled overflow valve (22). The controller is signal-connected to the electrically controlled overflow valve (22).

3. The multi-stage blank holder force device according to claim 1, characterized in that: It also includes a top plate (5) and ejector pins (4). There are multiple ejector pins (4). The bottom end of each ejector pin (4) is fixed to the lower template, and the top end of each ejector pin (4) is fixed to the top plate (5).

4. The multi-stage blank holder force device according to claim 3, characterized in that: The multi-stage pressing force device also includes a buffer sleeve (6), which is located above the machine base (1) and is fixed on the ejector pin (4).

5. The multi-stage blank holder force device according to claim 4, characterized in that: The ejector pin (4) is provided with external threads, and the buffer sleeve (6) is threadedly connected to the external threads.

6. A hydraulic press, characterized in that: include: The multi-stage blank holder device as described in any one of claims 1-5; Top frame, the top frame is located above the base (1), and the top frame is fixedly connected to the base (1); The main cylinder is fixed on the top frame; The upper template is driven by the master cylinder.

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