A warm isostatic pressing device

Abstract

This application relates to a thermostatic isostatic pressing (HPS) device, belonging to the field of isostatic pressing technology. The HPS device includes a high-pressure vessel, a medium oil device, temperature sensors, a heating device, and a controller. The medium oil device circulates and supplies medium oil into the high-pressure chamber. The temperature sensors are located at the top and bottom of the high-pressure vessel, monitoring the temperatures at the top and bottom of the chamber. The heating device is located at the bottom of the high-pressure vessel, and the controller controls the heating device based on the temperature sensors. The HPS device provided in this application, when the temperature sensors detect that the top temperature of the high-pressure vessel exceeds the bottom temperature, heats the bottom of the high-pressure vessel, causing the temperature throughout the high-pressure vessel to become more uniform, thereby improving product quality. Furthermore, the electromagnetic heating coil can synchronously heat the medium oil throughout the high-pressure vessel, generating heat from within the object and reducing heat loss during the transfer process.

Description

Technical Field

[0001] This application relates to the field of isostatic pressing technology, and in particular to a warm isostatic pressing device. Background Technology

[0002] A warm isostatic press is a device used to densify materials or products under high temperature and high pressure. It is mainly used to improve the performance of materials or products, such as eliminating porosity, increasing strength, and improving microstructure.

[0003] In the warm isostatic pressing process, the medium oil serves as a heat transfer and force transfer medium in the three steps of pressurization, pressure holding, and pressure release. During the pressurization step, the medium oil is pumped into the high-pressure sealed container; during the pressure holding step, the oil pump is stopped, and the medium oil is in a high-pressure holding stage; after the material is formed, the medium oil is depressurized, and the material is removed to complete the processing.

[0004] However, during the pressure holding process, it is difficult for the medium inside the container to form convection. The heat flux density is low, so it will rise, while the cold flux density is high, so it will sink. Therefore, the temperature of the medium oil inside the high-pressure sealed container will be unevenly distributed, which will affect the product quality. Utility Model Content

[0005] Therefore, it is necessary to provide a warm isostatic pressing device to solve the technical problem of uneven temperature during pressure holding in the existing warm isostatic press.

[0006] To achieve the above objectives, this application provides a warm isostatic pressing apparatus, which includes:

[0007] A high-pressure vessel, with a high-pressure chamber formed inside;

[0008] The medium oil device forms a circulation path with the high-pressure chamber, and the medium oil device is used to circulate and supply medium oil into the high-pressure chamber.

[0009] Multiple temperature sensors are located at the top and bottom of the high-pressure vessel. These temperature sensors are used to monitor the temperature at the top and bottom of the chamber.

[0010] A heating device is located at the bottom of the high-pressure vessel; and

[0011] The controller is electrically connected to both the temperature sensor and the heating device. The controller controls the operating parameters of the heating device based on the monitoring data from the temperature sensor.

[0012] Optionally, the high-pressure vessel includes:

[0013] The cylindrical body has a top opening and a bottom opening;

[0014] The top cover has an opening at the top, and a temperature sensor is installed inside the top cover; and

[0015] The lower cover is located at the bottom opening, and a temperature sensor and heating device are installed inside the lower cover.

[0016] Optionally, the heating device is an electric heating rod.

[0017] Optionally, a layer of steel wire is wound around the outer surface of the high-pressure vessel.

[0018] Optionally, an insulation layer is fitted onto the outer surface of the steel wire layer.

[0019] Optionally, an electromagnetic heating coil is fitted onto the outer surface of the insulation layer, and the electromagnetic heating coil is electrically connected to the controller.

[0020] Optionally, a protective housing is fitted onto the outer surface of the electromagnetic heating coil.

[0021] Optionally, the top and bottom of the outer side of the high-pressure vessel are provided with annular flanges, and the steel wire layer, insulation layer, electromagnetic heating coil and protective shell are all arranged between the two annular flanges.

[0022] Optionally, the medium oil device includes:

[0023] The fuel tank contains a medium of oil.

[0024] The oil inlet pipe is connected at both ends to the bottom of the oil tank and the high-pressure vessel, respectively.

[0025] The return oil pipeline is connected at both ends to the top of the oil tank and the high-pressure vessel, respectively;

[0026] Pump body, installed on the oil inlet pipe;

[0027] A booster device is installed on the oil inlet pipe; and

[0028] The pressure relief valve is installed on the return oil pipeline.

[0029] Optionally, the oil inlet pipe includes:

[0030] The main pipeline connects to the bottom of the high-pressure vessel at one end;

[0031] Two branch pipes are connected at both ends to the oil tank and the main pipe, respectively. The pump body and the booster device are respectively installed on the two branch pipes.

[0032] The beneficial effects of the isostatic pressing device provided in this application are as follows: Compared with the prior art, the isostatic pressing device of this application includes a high-pressure vessel, a medium oil device, multiple temperature sensors, a heating device, and a controller. The temperature sensors are used to monitor the temperature at the top and bottom of the chamber. The controller is electrically connected to the temperature sensors and the heating device respectively. The controller controls the operating parameters of the heating device according to the monitoring data of the temperature sensors. When the temperature sensor detects that the top temperature of the high-pressure vessel exceeds a certain value of the bottom temperature, the controller controls the heating device to start. The heating device heats the bottom of the high-pressure vessel separately, so that the temperature in all parts of the high-pressure vessel tends to be the same, thereby improving the product quality. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a cross-sectional structural schematic diagram of the isostatic pressing device provided in the embodiments of this application;

[0035] Figure 2 A control flowchart of the isostatic pressure apparatus provided in the embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. High-pressure vessel; 110. Cylinder; 120. Top cover; 130. Bottom cover; 140. Annular flange; 150. High-pressure chamber; 2. Medium oil device; 210. Oil tank; 220. Oil inlet pipe; 221. Main pipe; 222. Branch pipe; 230. Oil return pipe; 240. Pump body; 250. Pressure boosting device; 260. Pressure relief valve; 3. Temperature sensor; 4. Heating device; 5. Steel wire layer; 6. Insulation layer; 7. Electromagnetic heating coil; 8. Protective shell. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0044] An embodiment of this application provides a thermostatic pressure apparatus; please refer to [link to relevant documentation]. Figure 1 The isostatic pressure apparatus includes a high-pressure vessel 1, a medium oil device 2, multiple temperature sensors 3, a heating device 4, and a controller. The high-pressure vessel 1 has a high-pressure chamber inside, and a circulation path is formed between the medium oil device 2 and the high-pressure chamber. The medium oil device 2 is used to circulate and supply medium oil into the high-pressure chamber. Multiple temperature sensors 3 are respectively located at the top and bottom of the high-pressure vessel 1. The temperature sensors 3 are used to monitor the temperature at the top and bottom of the chamber. The heating device 4 is located at the bottom of the high-pressure vessel 1. The controller is electrically connected to the temperature sensors 3 and the heating device 4 respectively. The controller controls the operating parameters of the heating device 4 according to the monitoring data of the temperature sensors 3.

[0045] Preferably, the medium oil in this application is a heat transfer oil.

[0046] In this embodiment, the isostatic pressure apparatus includes a high-pressure vessel 1, a medium oil device 2, multiple temperature sensors 3, a heating device 4, and a controller. The temperature sensors 3 are used to monitor the temperature at the top and bottom of the chamber. The controller is electrically connected to the temperature sensors 3 and the heating device 4, respectively. The controller controls the operating parameters of the heating device 4 based on the monitoring data of the temperature sensors 3. When the temperature sensors 3 detect that the top temperature of the high-pressure vessel 1 exceeds a certain value of the bottom temperature, the controller controls the heating device 4 to start. The heating device 4 heats the bottom of the high-pressure vessel 1 separately, so that the temperature at all parts of the high-pressure vessel 1 tends to be the same, thereby improving product quality.

[0047] In one embodiment, see Figure 1 The high-pressure container 1 includes a cylinder 110, an upper cover 120, and a lower cover 130. The cylinder 110 has a top opening and a bottom opening. The upper cover 120 covers the top opening and a temperature sensor 3 is installed inside the upper cover 120. The lower cover 130 covers the bottom opening and a temperature sensor 3 and a heating device 4 are installed inside the lower cover 130.

[0048] Specifically, multiple sealing devices are provided between the upper cover 120 and the cylinder 110, and between the lower cover 130 and the cylinder 110 to prevent leakage of the medium oil.

[0049] In one embodiment, see Figure 1The heating device 4 is an electric heating rod. Specifically, multiple electric heating rods are provided, and the multiple electric heating rods are evenly distributed inside the lower cover 130.

[0050] In one embodiment, see Figure 1 The outer surface of the high-pressure vessel 1 is wrapped with a layer of steel wire 5. Compared with the existing high-pressure vessel 1 without steel wire winding, the pressure resistance of the vessel can be greatly improved by using prestressed steel wire winding technology. The prestressed steel wire winding cylinder 110 has an ultra-high pressure design that can withstand 600 MPa after rigorous calculation. At the same time, the steel wire winding cylinder 110 is lighter and cheaper than the traditional thick-walled cylinder 110.

[0051] In one embodiment, see Figure 1 An insulation layer 6 is fitted on the outer surface of the steel wire layer 5. The insulation layer 6 can reduce heat loss inside the high-pressure vessel 1 and avoid energy waste.

[0052] In one embodiment, see Figure 1 An electromagnetic heating coil 7 is fitted on the outer surface of the insulation layer 6, and the electromagnetic heating coil 7 is electrically connected to the controller.

[0053] Specifically, the working principle of the electromagnetic heating coil 7 is to use the principle of electromagnetic induction to generate an alternating magnetic field in the coil through alternating current. This magnetic field interacts with the metal material, causing eddy currents to be generated inside the metal material. The eddy currents generate heat through friction inside the metal, thereby heating the metal material.

[0054] like Figure 1 As shown, the cylinder 110 of the high-pressure container 1 is heated by an electromagnetic induction coil, and the heat of the cylinder 110 is conducted to the medium oil, causing the medium oil to heat up rapidly.

[0055] Electromagnetic induction heating has the following advantages: 1. High efficiency and energy saving: Because it heats directly by generating eddy currents inside the object being heated, the heat is generated inside the object, reducing heat loss during the heat transfer process; 2. Fast heating speed: The heat is generated inside the object, unlike traditional heating methods that require waiting for heat to gradually transfer from the outside to the inside; 3. High control precision: Electromagnetic induction heating equipment can achieve precise control by adjusting multiple parameters such as the output power, frequency, and heating time of the high-frequency power supply, and can flexibly adjust the heating process according to different heating needs.

[0056] It is understandable that in the isostatic pressing process, the temperature of each section of the high-pressure vessel 1 from top to bottom may be uneven. The high-pressure vessel 1 can be fitted with multiple electromagnetic heating coils 7 from top to bottom, and multiple temperature sensors 3 can be set on the high-pressure vessel 1 from top to bottom. The controller can adapt to control the working parameters of the multiple electromagnetic heating coils 7 according to the monitoring data of the multiple temperature sensors 3, so as to achieve the effect of making the temperature of each section of the high-pressure vessel 1 from top to bottom more uniform and improving product quality.

[0057] In one embodiment, see Figure 1 A protective shell 8 is fitted on the outer surface of the electromagnetic heating coil 7. The protective shell 8 can protect the internal steel wire layer 5, insulation layer 6 and electromagnetic heating coil 7 from damage.

[0058] In one embodiment, see Figure 1 The top and bottom of the outer side of the high-pressure vessel 1 are provided with annular flanges 140. The steel wire layer 5, the insulation layer 6, the electromagnetic heating coil 7 and the protective shell 8 are all arranged between the two annular flanges 140. The two annular flanges 140 can position and limit the steel wire layer 5, the insulation layer 6, the electromagnetic heating coil 7 and the protective shell 8 between them, so that the above structure is installed stably.

[0059] In one embodiment, see Figure 1 The medium oil device 2 includes an oil tank 210, an oil inlet pipe 220, an oil return pipe 230, a pump body 240, a booster device 250, and a pressure relief valve 260. The oil tank 210 stores medium oil. The two ends of the oil inlet pipe 220 are respectively connected to the bottom of the oil tank 210 and the high pressure vessel 1. The two ends of the oil return pipe 230 are respectively connected to the top of the oil tank 210 and the high pressure vessel 1. The pump body 240 is installed on the oil inlet pipe 220. The booster device 250 is installed on the oil inlet pipe 220. The pressure relief valve 260 is installed on the oil return pipe 230.

[0060] It is understandable that, due to the provision of the electromagnetic heating coil 7, the medium oil device 2 of this application does not require a heater to heat the medium oil.

[0061] In one embodiment, see Figure 1 The oil inlet pipe 220 includes a main pipe 221 and two branch pipes 222. One end of the main pipe 221 is connected to the bottom of the high-pressure vessel 1, and both ends of the branch pipes 222 are connected to the oil tank 210 and the main pipe 221, respectively. The pump body 240 and the booster device 250 are respectively installed on the two branch pipes 222 to achieve separate control.

[0062] Please see Figure 2 The working process of the isostatic pressing apparatus of this application is explained below:

[0063] The temperature control process of this device is as follows: Figure 2 As shown, first, set the working temperature T on the operation panel, turn on the preheating of the medium oil tank circulation system and the heating of the electromagnetic heating coil. When the medium in the cylinder reaches the temperature T3 (T3 is calculated by the temperature control algorithm based on the set temperature and the pressing pressure), turn off the medium oil tank circulation system and turn on the pressurization system to enter the pressurization stage. At this time, the electromagnetic coil remains on, and the temperature of the medium in the cavity is controlled in real time through the feedback signals of the upper (T1) and lower (T2) temperature sensors (target value: T1-T2≤2℃). When the temperature of the medium in the high-pressure vessel cavity reaches the set value T, adjust the heating power of the electromagnetic heating coil and the heating device of the lower cover to achieve dual closed-loop control. The equipment enters the pressure holding and heat holding stage. When the pressure holding time is up, turn off the electromagnetic heating coil and the heating device, and the equipment enters the depressurization and rapid cooling stage. Open the cavity and take out the workpiece to end this pressing temperature control process.

[0064] Temperature control algorithm T3 is calculated as follows:

[0065]

[0066] η: Temperature coefficient, which is related to the initial temperature and pressing pressure;

[0067] T: Operating temperature setpoint;

[0068] ∆T a Temperature correction empirical value;

[0069] P2: Pressure at the end of the pressurization process;

[0070] P1: Pressure at the start of pressurization;

[0071] C p (T): The specific heat capacity of the medium oil, which is positively correlated with temperature;

[0072] m: Mass of the medium oil.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A thermostatic pressure apparatus, characterized in that, include: A high-pressure vessel, with a high-pressure chamber formed inside; A medium oil device forms a circulation path with the high-pressure chamber, and the medium oil device is used to circulate and supply medium oil into the high-pressure chamber. Multiple temperature sensors are disposed at the top and bottom of the high-pressure vessel, and the temperature sensors are used to monitor the temperature at the top and bottom of the chamber; A heating device is installed at the bottom of the high-pressure vessel; as well as The controller is electrically connected to both the temperature sensor and the heating device, and controls the operating parameters of the heating device based on the monitoring data from the temperature sensor.

2. The isostatic pressing device according to claim 1, characterized in that, The high-pressure vessel includes: The cylindrical body has a top opening and a bottom opening; A top cover is provided over the top opening, and the temperature sensor is disposed inside the top cover; and The lower cover is provided at the bottom opening, and the temperature sensor and the heating device are disposed inside the lower cover.

3. The isostatic pressing device according to claim 2, characterized in that, The heating device is an electric heating rod.

4. The isostatic pressing apparatus according to any one of claims 1-3, characterized in that, The outer surface of the high-pressure vessel is wrapped with a layer of steel wire.

5. The isostatic pressing apparatus according to claim 4, characterized in that, An insulation layer is fitted onto the outer surface of the steel wire layer.

6. The isostatic pressing apparatus according to claim 5, characterized in that, An electromagnetic heating coil is fitted onto the outer surface of the insulation layer, and the electromagnetic heating coil is electrically connected to the controller.

7. The isostatic pressing apparatus according to claim 6, characterized in that, A protective shell is fitted onto the outer surface of the electromagnetic heating coil.

8. The isostatic pressing apparatus according to claim 7, characterized in that, The top and bottom of the outer side of the high-pressure vessel are provided with annular baffles, and the steel wire layer, the insulation layer, the electromagnetic heating coil and the protective shell are all disposed between the two annular baffles.

9. The isostatic pressing apparatus according to claim 6, characterized in that, The medium oil device includes: The fuel tank contains a medium of oil. The oil inlet pipe is connected at both ends to the bottom of the oil tank and the high-pressure vessel, respectively. The return oil pipeline is connected at both ends to the top of the oil tank and the high-pressure vessel, respectively; The pump body is mounted on the oil inlet pipe; A booster device is installed on the oil inlet pipe; and A pressure relief valve is installed on the oil return pipeline.

10. The isostatic pressing apparatus according to claim 9, characterized in that, The oil inlet pipe includes: The main pipeline is connected at one end to the bottom of the high-pressure vessel; Two branch pipes are provided, with each end of the branch pipe connected to the oil tank and the main pipe, respectively. The pump body and the booster device are respectively installed on the two branch pipes.

Images