Vacuum hot pressing furnace

Abstract

The utility model relates to the technical field of hot pressing furnaces, and discloses a vacuum hot pressing furnace which comprises a rack, a vacuum hot pressing cavity, an upper pressing head unit and a lower pressing head. According to the vacuum hot pressing furnace provided by the utility model, the energy storage device, the driving assembly, the upper pressing head, the lower pressing head and the vacuum hot pressing cavity are matched, so that pressure acts on a material in a precise and stable change manner, and the vacuum hot pressing effect is further optimized.

Description

Technical Field

[0001] This utility model belongs to the field of hot press furnace technology, and specifically relates to a vacuum hot press furnace. Background Technology

[0002] Vacuum hot pressing sintering machine is a device that combines vacuum, hot pressing, and high-temperature sintering. As a material preparation equipment, it is widely used in industries such as powder metallurgy and welding.

[0003] Traditional vacuum hot pressing sintering machines primarily apply constant pressure or rate via hydraulic or mechanical means, combined with a high-temperature environment, to achieve material densification. However, this traditional method has limitations. For example, because traditional vacuum hot pressing sintering machines can only provide constant static pressure or simple linear pressurization, they are prone to excessive local stress, leading to microcracks or interface defects in the sintered material. A single pressure mode is insufficient to adapt to materials under different temperature gradients, thus failing to promote sufficient densification and resulting in defects such as residual pores, incomplete fusion, or incomplete penetration, while also affecting the weld ratio and interfacial bonding strength. Furthermore, under variable pressure conditions, sudden pressure changes can cause instantaneous stress impacts on the material, leading to uneven internal stress distribution and excessive local deformation, which also has adverse effects on vacuum hot-pressed materials.

[0004] Therefore, achieving precise and stable pressure changes has become the key to improving the performance of vacuum hot pressing sintering machines. Utility Model Content

[0005] To address the shortcomings of the prior art, this invention provides a vacuum hot press furnace, which solves the problem of inaccurate and stable pressure changes during vacuum hot pressing.

[0006] The technical effects to be achieved by this utility model are realized through the following technical aspects:

[0007] This utility model provides a vacuum hot press furnace, including

[0008] frame;

[0009] A vacuum thermopressing chamber is provided on the frame;

[0010] The upper pressure head unit includes at least one energy storage device, a drive assembly, and an upper pressure head. The energy storage device and the drive assembly are mounted on the frame, and the drive assembly drives the upper pressure head to extend and retract into the vacuum hot pressing chamber. The oil interface of the energy storage device is connected to the drive assembly.

[0011] The lower pressure head is disposed in the vacuum hot pressing cavity and is arranged opposite to the upper pressure head. A hot pressing station is formed between the upper pressure head and the lower pressure head, and the hot pressing station is located in the vacuum hot pressing cavity.

[0012] In some embodiments, the vacuum hot press furnace further includes:

[0013] Force sensor, the force sensor being connected to the upper pressure head;

[0014] A controller, mounted on the frame, is electrically connected to the force sensor and the drive assembly.

[0015] In some embodiments, the vacuum hot press furnace also includes

[0016] A displacement sensor is fixedly connected to the drive assembly and is signal-connected to the controller.

[0017] In some embodiments, the drive assembly includes an upper pressure head drive member and a drive connecting rod, the force sensor is sleeved on the outside of the drive connecting rod, and the upper pressure head is connected to the drive end of the drive connecting rod.

[0018] In some embodiments, the drive assembly includes an upper pressure head drive and a drive control valve, the drive control valve being connected between the energy storage device and the upper pressure head drive, and the controller being electrically connected to the drive control valve.

[0019] In some embodiments, at least two uprights are provided on the frame, the vacuum hot press furnace includes an upper crossbeam, the upper crossbeam is located at the end of the uprights away from the lower pressure head, and the energy storage device and the drive assembly are connected to the upper crossbeam.

[0020] In some embodiments, the frame is provided with at least one telescopic cylinder, the vacuum hot press furnace includes an upper crossbeam, the upper crossbeam is connected to the end of the telescopic cylinder away from the lower pressure head, and the energy storage device and the drive assembly are fixedly connected to the upper crossbeam;

[0021] The telescopic cylinder drives the upper crossbeam to move, so that the drive assembly, along with the upper pressure head, moves closer to or away from the vacuum hot pressing chamber.

[0022] In some embodiments, at least two uprights are provided on the frame, the uprights pass through the upper crossbeam, and the upper crossbeam moves along the uprights under the drive of the telescopic cylinder.

[0023] In some embodiments, the telescopic cylinder includes a telescopic rod and a sleeve, the telescopic rod being fixedly connected to the frame, and the sleeve being movably sleeved outside the telescopic rod;

[0024] The upper crossbeam is fixedly connected to the sleeve.

[0025] In some embodiments, at least one telescopic cylinder is two telescopic cylinders, and the two ends of the upper crossbeam are respectively connected to connecting members, and the upper crossbeam is connected between the two telescopic cylinders through the connecting members.

[0026] In summary, this utility model has at least the following advantages:

[0027] 1. The vacuum hot press furnace provided by this utility model achieves precise and stable pressure changes on the material through the cooperation of an energy storage device, a drive assembly, an upper pressure head, a lower pressure head, and a vacuum hot press chamber, thereby optimizing the vacuum hot press effect. Specifically, a hot press station is formed between the upper and lower pressure heads within the vacuum hot press chamber, and the drive assembly drives the upper pressure head to work. During operation, the drive assembly adjusts the drive state in real time to change the force applied by the upper pressure head. At this time, the oil interface of the energy storage device is connected to the drive assembly, ensuring smooth operation of the drive assembly and thus guaranteeing the stability of the pressure while the upper pressure head is changing. This ensures stable pressure changes and precise pressure control, resulting in excellent vacuum hot press performance. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this utility model.

[0029] Figure 2 This is a cross-sectional view of the overall structure of Embodiment 1 of this utility model.

[0030] Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this utility model.

[0031] Marked in the image:

[0032] 1. Rack;

[0033] 2. Vacuum hot pressing chamber;

[0034] 3. Upper pressure head unit; 31. Energy storage device; 32. Drive assembly; 321. Upper pressure head drive component; 322. Drive connecting rod; 33. Upper pressure head;

[0035] 4. Lower pressure head;

[0036] 51. Force sensor; 52. Displacement sensor;

[0037] 6. Controller;

[0038] 7. Erecting poles;

[0039] 8. Upper crossbeam; 81. Connecting parts;

[0040] 91. Telescopic cylinder; 911. Telescopic rod; 912. Sleeve 。 Detailed Implementation

[0041] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings and specific embodiments. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0042] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0043] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. 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. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0045] Example 1:

[0046] Please see the appendix Figure 1-2 This embodiment provides a multi-mode mechanical loading vacuum hot press furnace, including a frame 1, a vacuum hot press chamber 2, an upper pressure head unit 3, and a lower pressure head 4. This vacuum hot press furnace achieves precise and stable pressure changes through the coordination of its various structures, ultimately optimizing the material hot pressing effect.

[0047] Specifically, a vacuum hot pressing chamber 2 is provided on the frame 1, and a hot pressing station is formed between the upper pressing head unit 3 and the lower pressing head 4, and the hot pressing station is located inside the vacuum hot pressing chamber 2. The upper pressing head unit 3 includes an energy storage device 31, a drive assembly 32, and an upper pressing head 33. The energy storage device 31 and the drive assembly 32 are connected to the frame 1. The pressurizing ends of the upper pressing head 33 and the lower pressing head 4 are arranged facing each other and located inside the vacuum hot pressing chamber 2. During operation, the material is placed at the hot pressing station, and the upper pressing head 33 and the lower pressing head 4 apply pressure to the material. The vacuum hot pressing chamber 2 provides a vacuum and a relatively closed environment for the hot pressing process of the material to achieve hot pressing sintering of the material. In this embodiment, the upper pressing head 33 extends and retracts within the vacuum hot pressing chamber 2 under the driving action of the drive assembly 32 to adapt to changes in the material volume; the pressing end of the lower pressing head 4 is fixed inside the vacuum hot pressing chamber and is used to support the material. The drive assembly 32 is connected to the oil interface of the accumulator 31, so that the accumulator 31 can control the oil pressure of the drive assembly 32 to maintain a stable pressure when the upper pressure head 33 is working, thereby improving the accuracy of pressure control.

[0048] Furthermore, the vacuum autoclave also includes a force sensor 51 and a controller 6. The controller 6 is mounted on the frame 1 and electrically connected to the force sensor 51 and the drive assembly 32 to control the operating state of the drive assembly 32. Simultaneously, the force sensor 51 is connected to the upper pressure head unit 3 to obtain the pressure parameters exerted by the upper pressure head 33 on the material in real time. During operation, the controller 6 generates dynamic pressure commands according to a preset program, sends signals to the drive assembly 32, and controls the operating mode of the drive assembly 32, enabling the drive assembly 32 to drive the upper pressure head 33 to operate under dynamic loading.

[0049] During this process, the force sensor 51 acquires the pressure exerted on the material by the upper pressure head 33 in real time and feeds the data back to the controller 6. The controller 6 adjusts the control of the drive component 32 in a timely manner based on the real-time data to ensure that the loading process of the upper pressure head 33 matches the preset process parameters. At the same time, the energy storage device 31 is connected to the drive component 32 through the oil interface and adjusts the oil pressure of the drive component 32 in real time to ensure that the drive component 32 can smoothly regulate the working state of the upper pressure head 33. This allows the upper pressure head 33 to have stability during dynamic loading, achieving precise pressure control. This further facilitates the dynamic adjustment of pressure parameters according to the material densification stage, avoiding stress concentration or uneven densification caused by constant pressure.

[0050] It should be noted that the preset program used by controller 6 refers to the preset dynamic loading waveform function within the programmable waveform generator. Controller 6 generates dynamic instructions by parsing the waveform function. The parameters of the waveform function include amplitude, frequency, waveform type, duty cycle, etc. Adjusting these parameters affects the pressure peak, loading rate, loading changes, and the duration of high / low pressure of the square wave during the operation of the upper pressure head 33. The parameters of the waveform function can be customized, giving the vacuum hot press furnace high versatility and excellent vacuum hot pressing effect.

[0051] Furthermore, the vacuum autoclave may also include a displacement sensor 52, which measures the real-time displacement of the upper pressure head 33 and reflects the amount of material compression deformation. The displacement sensor 52 is signal-connected to the controller 6 to feed back the obtained displacement data to the controller 6. The controller 6 promptly adjusts the movement of the drive assembly 32 based on the feedback from the displacement sensor 52 and the preset program.

[0052] In this embodiment, the controller 6 can combine the real-time monitoring data of the pressure sensor 51 and the displacement sensor 52 to make real-time adjustments to the drive component 32, so that the controller 6, the upper pressure head unit 3, and the pressure sensor 51 and the displacement sensor 52 form a closed-loop control, ensuring that the loading process is highly consistent with the preset waveform, and finally achieving the synergistic optimization of material sintering and dynamic mechanical loading.

[0053] Furthermore, to ensure structural stability, the drive assembly 32 includes an upper pressure head drive component 321 and a drive connecting rod 322. A force sensor 51 is sleeved on the outside of the drive connecting rod 322 and located between the upper pressure head drive component 321 and the upper pressure head 33, which is connected to the drive end of the drive connecting rod 322. The force sensor 51 and the upper pressure head 33 move with the movement of the drive connecting rod 322. During operation, the upper pressure head drive component 321 moves the upper pressure head 33 towards the vacuum hot pressing chamber 2 via the drive connecting rod 322. The upper pressure head 33 moves inside the vacuum hot pressing chamber 2, while the force sensor 51 is located outside the vacuum hot pressing chamber 2 to avoid the force sensor 51 being affected by the internal environment of the vacuum hot pressing chamber 2.

[0054] At this time, the force sensor 51 can monitor the actual pressure exerted on the material by the upper pressure head 33 in real time, and the displacement sensor 52 is stably located at the other end of the drive assembly 32 to monitor the displacement of the upper pressure head 33 in real time.

[0055] Furthermore, the vacuum autoclave also includes a drive control valve, which is connected between the accumulator 31 and the upper pressure head drive component 321, and the controller 6 is electrically connected to the drive control valve. During operation, the controller 6 issues a command to the drive control valve to adjust the oil volume and direction between the upper pressure head drive component 321 and the accumulator 31, thereby precisely controlling the working state of the upper pressure head drive component 321 and realizing the dynamic loading of the upper pressure head 33.

[0056] Furthermore, the vacuum hot press furnace also includes an upper crossbeam 8, and at least two uprights 7 are provided on the frame 1. The upper crossbeam 8 is connected between the uprights 7 and is located at the end away from the lower pressure head 4. The energy storage device 31 and the drive assembly 32 are fixedly connected to the upper crossbeam 8 to fix the position of the upper pressure head unit 3, while the upper pressure head 33 moves in and out of the vacuum hot press chamber 2 under the action of the drive assembly 32.

[0057] In the vacuum hot press furnace provided in this embodiment, the energy storage device 31 maintains pressure stability while it changes by controlling the oil pressure of the drive assembly 32. This ensures smooth transitions between pressure changes, achieving precise pressure control and solving the problem of unstable pressure changes during vacuum hot pressing. Consequently, the vacuum hot press furnace exhibits excellent vacuum hot pressing performance. Furthermore, the controller 6 issues commands based on sensor data to dynamically load the upper pressure head 33, adapting the instantaneous pressure of the upper pressure head 33 to the material. This can alter the nucleation and growth rates, and also influence grain size. By rationally controlling the pressure, the crystallization process can be optimized, producing materials with specific properties. Simultaneously, the periodic shearing effect generated by alternating pressure reduces porosity and microcracks at the weld joint, improving interfacial bonding strength.

[0058] Example 2:

[0059] This embodiment further optimizes the structure of the vacuum hot press furnace based on Embodiment 1. For similarities, please refer to Embodiment 1. The following is a detailed description... Figure 3 Explain the differences.

[0060] The vacuum autoclave also includes an upper crossbeam 8 and at least one telescopic cylinder 91. The telescopic cylinder 91 is connected to the frame 1, and its end away from the lower pressure head 4 is connected to the upper crossbeam 8. The energy storage device 31 and the drive assembly 32 are both fixedly connected to the upper crossbeam 8. The telescopic cylinder 91 drives the upper crossbeam 8 to move, so that the drive assembly 32 on the upper crossbeam 8 moves closer to or further away from the vacuum autoclave 2, thereby further increasing the movement range of the upper pressure head 33 and making the vacuum autoclave adaptable to materials of more sizes.

[0061] Furthermore, at least two uprights 7 are provided on the frame 1. Among them, the upper crossbeam 8 is movably connected to the uprights 7 and is located at the end of the uprights 7 away from the lower pressure head 4. The uprights 7 pass through the upper crossbeam 8, and the upper crossbeam 8 moves vertically along the uprights 7 under the driving action of the telescopic cylinder 91.

[0062] Furthermore, the telescopic cylinder 91 includes a telescopic rod 911 and a sleeve 912 sleeved outside the telescopic rod 911, with the sleeve 912 movably connected to the telescopic rod 911. The upper crossbeam 8 is fixedly connected to the sleeve 912 and moves as the sleeve 912 moves relative to the telescopic rod 911.

[0063] Furthermore, in this embodiment, there are two telescopic cylinders. Connectors 81 are provided at both ends of the upper crossbeam 8, and the upper crossbeam 8 is connected to the sleeve 912 via the connectors 81.

[0064] Furthermore, there are at least two energy storage devices 31, one of which has its oil interface connected to the telescopic cylinder 91. During the movement of the telescopic cylinder 91, the energy storage device 31 reduces the pulsation of the cylinder, further improving the stability of the vacuum autoclave during operation. It can effectively adjust the pressure of the upper pressure head 33, increase the pressure range, and improve stability during dynamic pressure changes.

[0065] The above description is merely an example and illustration of the structure of this utility model, and while the description is quite specific and detailed, it should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these obvious substitutions all fall within the protection scope of this utility model.

Claims

1. A vacuum hot press furnace, characterized in that, include Rack (1); A vacuum hot pressing chamber (2) is provided on the frame (1); The upper pressure head unit (3) includes at least one energy storage device (31), a drive assembly (32) and an upper pressure head (33). The energy storage device (31) and the drive assembly (32) are mounted on the frame (1), and the drive assembly (32) drives the upper pressure head (33) so that the upper pressure head (33) can extend and retract into the vacuum hot pressing chamber (2). The oil interface of the energy storage device (31) is connected to the drive assembly (32). The lower pressure head (4) is located inside the vacuum hot pressing cavity (2) and is positioned opposite to the upper pressure head (33). A hot pressing station is formed between the upper pressure head (33) and the lower pressure head (4), and the hot pressing station is located inside the vacuum hot pressing cavity (2).

2. The vacuum hot press furnace as described in claim 1, characterized in that, The vacuum hot press furnace also includes: Force sensor (51), the force sensor (51) being connected to the upper pressure head (33); The controller (6) is installed on the frame (1) and is electrically connected to the force sensor (51) and the drive assembly (32).

3. The vacuum hot press furnace as described in claim 2, characterized in that, The vacuum hot press furnace also includes The displacement sensor (52) is fixedly connected to the drive assembly (32) and is signal-connected to the controller (6).

4. The vacuum hot press furnace as described in claim 3, characterized in that, The drive assembly (32) includes an upper pressure head drive component (321) and a drive connecting rod (322). The force sensor (51) is sleeved on the outside of the drive connecting rod (322), and the upper pressure head (33) is connected to the drive end of the drive connecting rod (322).

5. The vacuum hot press furnace as described in claim 4, characterized in that, The vacuum hot press furnace also includes a drive control valve, which is connected between the energy storage device (31) and the upper pressure head drive (321), and the controller (6) is electrically connected to the drive control valve.

6. The vacuum hot press furnace as described in claim 3 or 4, characterized in that, At least two uprights (7) are provided on the frame (1). The vacuum hot press furnace includes an upper crossbeam (8). The upper crossbeam (8) is located at the end of the upright (7) away from the lower pressure head (4). The energy storage device (31) and the drive assembly (32) are connected to the upper crossbeam (8).

7. The vacuum hot press furnace as described in claim 3 or 4, characterized in that, The frame (1) is provided with at least one telescopic cylinder (91), the vacuum hot press furnace includes an upper crossbeam (8), the upper crossbeam (8) is connected to the telescopic cylinder (91) and is located at the end of the telescopic cylinder (91) away from the lower pressure head (4), and the energy storage device (31) and the drive assembly (32) are fixedly connected to the upper crossbeam (8); The telescopic cylinder (91) drives the upper crossbeam (8) to move, so that the drive assembly (32) and the upper pressure head (33) move closer to or away from the vacuum hot press chamber (2).

8. The vacuum hot press furnace as described in claim 7, characterized in that, At least two uprights (7) are provided on the frame (1), the uprights (7) pass through the upper crossbeam (8), and the upper crossbeam (8) moves along the uprights (7) under the driving action of the telescopic cylinder (91).

9. The vacuum hot press furnace as described in claim 7, characterized in that, The telescopic cylinder (91) includes a telescopic rod (911) and a sleeve (912). The telescopic rod (911) is fixedly connected to the frame (1), and the sleeve (912) is movably sleeved outside the telescopic rod (911). The upper crossbeam (8) is fixedly connected to the sleeve (912).

10. The vacuum hot press furnace as described in claim 7, characterized in that, At least one of the telescopic cylinders (91) is two telescopic cylinders (91), and the two ends of the upper crossbeam (8) are respectively connected to the connecting parts (81). The upper crossbeam (8) is connected between the two telescopic cylinders (91) through the connecting parts (81).

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