Method for manufacturing internal high-pressure formed member, internal high-pressure formed member, and electronic device

Abstract

The disclosure provides a manufacturing method of an internal high-pressure formed part, the internal high-pressure formed part and an electronic device. The manufacturing method comprises the following steps: placing a workpiece in a preset mold, and filling a liquid medium into the workpiece, wherein the liquid medium comprises a molten metal or a molten inorganic salt; and applying a preset pressure to the liquid medium. Under the action of the temperature of the liquid medium and the preset pressure, the workpiece is plastically deformed until the shape of the workpiece is the same as the cavity of the preset mold, and the internal high-pressure formed part is obtained. The melting point of the workpiece is greater than the temperature of the liquid medium. By setting that the liquid medium comprises the molten metal or the molten inorganic salt, the metal or the inorganic salt is in a stable molten state at high temperature, and cannot be denatured or chemically reacted. The molten metal or the molten inorganic salt can also provide high temperature to heat the workpiece, so that the workpiece is plastically deformed under the action of the temperature of the liquid medium and the preset pressure to form the internal high-pressure formed part, and the forming effect of the internal high-pressure formed part is good.

Description

Technical Field

[0001] This disclosure relates to the field of lightweight structural component manufacturing technology, and in particular to a method for manufacturing an internal high-pressure forming component, the internal high-pressure forming component, and electronic equipment. Background Technology

[0002] Hydraulic forming is a plastic forming technology that uses liquid as a force transmission medium or mold to shape workpieces. It only requires a punch or die to form the workpiece, saving mold processing costs and time. The liquid medium used in hydraulic forming can include water, oil, emulsions, etc. Depending on the blank material, hydraulic forming includes sheet metal hydraulic forming, shell hydraulic forming, and tube hydraulic forming (also known as internal high-pressure forming).

[0003] For workpieces made of high-strength metals that are difficult to deform at room temperature, it is usually necessary to heat the workpiece and the liquid medium to a sufficiently high temperature to enhance the workpiece's deformability and thus achieve the effect of shaping the workpiece. However, at higher temperatures, liquid media such as water, oil, and emulsions are prone to deterioration or denaturation, affecting the forming effect of the workpiece. Summary of the Invention

[0004] To overcome the problems existing in the related technologies, this disclosure provides a method for manufacturing an internal high-pressure forming part, an internal high-pressure forming part, and an electronic device.

[0005] According to a first aspect of this disclosure, a method for manufacturing an internal high-pressure formed part is provided, the method comprising:

[0006] The workpiece is placed in a preset mold and a liquid medium is filled into the workpiece, the liquid medium including molten metal or molten inorganic salt;

[0007] A preset pressure is applied to the liquid medium. Under the action of the temperature of the liquid medium and the preset pressure, the workpiece undergoes plastic deformation until the shape of the workpiece is the same as the cavity of the preset mold, thus obtaining the internal high-pressure formed part.

[0008] The melting point of the workpiece is greater than the temperature of the liquid medium.

[0009] In some embodiments of this disclosure, the molten metal includes at least one of molten elemental aluminum, aluminum alloy, elemental tin, tin alloy, elemental zinc, and zinc alloy.

[0010] In some embodiments of this disclosure, the molten inorganic salt includes at least one of molten sodium chloride, potassium chloride, calcium chloride, magnesium chloride, and sodium sulfate.

[0011] In some embodiments of this disclosure, the yield strength of the material of the workpiece is >400MPa.

[0012] In some embodiments of this disclosure, the material of the workpiece includes titanium alloys, iron-based alloys, or nickel-based alloys.

[0013] In some embodiments of this disclosure, the preset pressure is 100MPa-1000MPa.

[0014] In some embodiments of this disclosure, the method for manufacturing the internal high-pressure forming part further includes, before filling the workpiece with a liquid medium:

[0015] A preset mold closing pressure is applied to the preset mold.

[0016] In some embodiments of this disclosure, the preset molding pressure is greater than 1.2 times the preset pressure.

[0017] In some embodiments of this disclosure, the method for manufacturing the internal high-pressure forming part further includes:

[0018] Under the preset mold closing pressure, the liquid medium solidifies to form a solid medium, thus obtaining a rough blank of an internally high-pressure forming part;

[0019] The inner high-pressure forming blank is heated to a preset temperature, causing the solid medium to melt and form the liquid medium. The liquid medium is then separated from the workpiece to obtain the inner high-pressure forming part.

[0020] According to a second aspect of this disclosure, an internal high-pressure forming part is provided, which is formed by the manufacturing method of the internal high-pressure forming part provided in the first aspect of this disclosure.

[0021] In some embodiments of this disclosure, the inner high-pressure forming component includes a middle frame.

[0022] According to a third aspect of this disclosure, an electronic device is provided, the electronic device comprising the internal high-pressure forming part provided in the second aspect of this disclosure.

[0023] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: In the process of manufacturing internal high-pressure forming parts, the liquid medium filled into the workpiece includes molten metal or molten inorganic salt. The metal or inorganic salt is in a stable molten state at high temperature and will not deform or undergo chemical reaction. The molten metal or molten inorganic salt can also provide high temperature to heat the workpiece, so that the workpiece undergoes plastic deformation under the action of the temperature and preset pressure of the liquid medium to form an internal high-pressure forming part. The forming effect of the internal high-pressure forming part is good.

[0024] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0026] Figure 1 This is a flowchart illustrating a method for manufacturing an internal high-pressure forming part according to an exemplary embodiment.

[0027] Figures 2a to 2c This is a schematic diagram illustrating the manufacturing process of an internal high-pressure forming part according to an exemplary embodiment. Detailed Implementation

[0028] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the invention as detailed in the appended claims.

[0029] Hydraulic forming is a plastic forming technology that uses liquid as a force transmission medium or mold to shape workpieces. It only requires a punch or die to form the workpiece, saving mold processing costs and time. The liquid medium used in hydraulic forming can include water, oil, emulsions, etc. Depending on the blank material, hydraulic forming includes sheet metal hydraulic forming, shell hydraulic forming, and tube hydraulic forming (also known as internal high-pressure forming).

[0030] When the workpiece processed by internal high-pressure forming is made of a high-strength metal that is difficult to deform at room temperature, it is usually necessary to heat the workpiece and the liquid medium to a sufficiently high temperature to enhance the workpiece's deformability and thus achieve the desired shaping effect. However, at higher temperatures, liquid media such as oil and emulsions are prone to denaturation and carbonization, affecting the forming effect of the workpiece. In addition, when the liquid medium includes water, the water is prone to vaporization at high temperatures, leading to an increase in pressure inside the workpiece, which affects the accuracy of pressure control in the internal high-pressure forming process and thus the forming effect of the workpiece.

[0031] In view of this, the present disclosure provides a method for manufacturing an internal high-pressure forming part. In the manufacturing process of the internal high-pressure forming part, the liquid medium filled into the workpiece includes molten metal or molten inorganic salt. The metal or inorganic salt is in a stable molten state at high temperature and will not deform or undergo chemical reaction. The molten metal or molten inorganic salt can also provide high temperature to heat the workpiece, so that the workpiece undergoes plastic deformation under the action of the temperature and preset pressure of the liquid medium to form an internal high-pressure forming part. The forming effect of the internal high-pressure forming part is good.

[0032] An exemplary embodiment of this disclosure provides a method for manufacturing an internal high-pressure formed part, with reference to... Figure 1 As shown, Figure 1 This is a flowchart illustrating a method for manufacturing an internal high-pressure formed part according to an exemplary embodiment. The method for manufacturing an internal high-pressure formed part includes the following steps:

[0033] Step S100: Place the workpiece in a preset mold and fill the workpiece with a liquid medium, which includes molten metal or molten inorganic salt;

[0034] Step S200: Apply a preset pressure to the liquid medium. Under the action of the temperature and preset pressure of the liquid medium, the workpiece undergoes plastic deformation until the shape of the workpiece is the same as the cavity of the preset mold, thus obtaining an internal high-pressure formed part.

[0035] Under external force, materials can undergo elastic deformation, meaning they will return to their original size and shape after the force is removed. However, when the external force continues to increase to a certain value, the material enters the plastic deformation stage, where its size and shape will not return after the force is removed. The strength at the critical point between these two deformations is called the material's yield strength. (Reference) Figures 2a to 2c The material of workpiece 10 in this disclosure can have a large yield strength. Workpiece 10 has poor cold-working properties; therefore, workpiece 10 can only undergo good plastic deformation when heated to a certain temperature. In some examples, the yield strength of the material of workpiece 10 in this disclosure embodiment is >500 MPa. In some examples, the yield strength of the material of workpiece 10 in this disclosure embodiment is >400 MPa.

[0036] In some examples, the material of workpiece 10 may include titanium alloys, iron-based alloys, or nickel-based alloys. Titanium alloys may include α-type alloys, β-type alloys, and α-β-type alloys. The yield strength of titanium alloys is typically >600 MPa, and their melting point is typically between 1600℃ and 1700℃. Iron-based alloys may include carbon steel, stainless steel, etc. For example, the yield strength of 40Cr carbon steel is approximately 780 MPa; the yield strength of 20CrMnTi carbon steel is approximately 820 MPa; and the yield strength of SUS630 stainless steel is approximately 1100 MPa. The melting point of iron-based alloys is typically between 1300℃ and 1500℃. Nickel-based alloys typically have a yield strength greater than 500 MPa, and their melting point is typically between 1200℃ and 1300℃.

[0037] In step S100, refer to Figure 2aSince workpiece 10 is used to form an internal high-pressure formed part, the shape of workpiece 10 can be a tube, so that after the liquid medium 30 is filled into the workpiece 10, the pressure transmitted by the liquid medium 30 is uniformly applied to the inside of the workpiece 10. The shape of workpiece 10 can include, for example, a through-type tube with openings at both ends, or a container-type tube with only one end open.

[0038] The pre-formed mold 20 can accommodate the workpiece 10, and the inner wall of the pre-formed mold 20 can have a certain shape, which can be set based on the outer shape of the internal high-pressure forming part to be formed from the workpiece 10. The workpiece 10 is placed in the pre-formed mold 20, and one end of the workpiece 10 is sealed to prevent leakage of the subsequently filled liquid medium 30. For example, when the workpiece 10 is a through-type pipe, one end of the workpiece 10 can be clamped with a clamp, or sealed with a punch; when the workpiece 10 is a container-type pipe, a punch can be used to limit the bottom wall of the container-type pipe.

[0039] A liquid medium 30 is filled into the workpiece 10, which is placed in a preset mold 20, so that the gas inside the workpiece 10 is discharged. The liquid medium 30 is used to transmit pressure to cause the workpiece 10 to undergo plastic deformation to form an internal high-pressure formed part. The liquid medium 30 may include molten metal or molten inorganic salt. That is, the metal or inorganic salt can be melted into a molten state at high temperature to serve as the liquid medium 30. Since the molten metal or inorganic salt has a high temperature, after the liquid medium 30 is filled into the workpiece, the deformation resistance of the workpiece 10 can be significantly reduced under the high temperature provided by the liquid medium 30, and the deformation capacity of the workpiece 10 can be increased, so that the workpiece 10 can have good forming performance under the subsequent preset pressure, and undergo plastic deformation to form an internal high-pressure formed part.

[0040] Since the liquid medium 30 includes molten metal or molten inorganic salt, and molten metal or molten inorganic salt is liquid at high temperature and has good stability, its properties will not change significantly after high pressure is applied. This is beneficial for the workpiece 10 to form a well-shaped internal high-pressure formed part under certain temperature and pressure. In some examples, a metal or inorganic salt with a large difference between its melting point and boiling point can be selected to form the liquid medium 30. This allows the temperature of the liquid medium 30 to be flexibly set based on the material of the workpiece 10, and ensures that the liquid medium 30 remains stable in a molten state after high pressure is applied, without significant changes in its properties.

[0041] It should be noted that, in order to ensure the properties of the internally high-pressure formed part of workpiece 10, a molten metal or molten inorganic salt that does not chemically react with the material of workpiece 10 can be selected as the liquid medium 30. Furthermore, since workpiece 10 needs to remain solid and undergo plastic deformation to form the internally high-pressure formed part, the temperature of the liquid medium 30 must be set lower than the melting point of the forming material of workpiece 10 to prevent workpiece 10 from also becoming molten and unable to be formed after the liquid medium 30 is filled into it.

[0042] In some examples, the molten metal that can serve as the liquid medium 30 may include at least one of molten elemental aluminum, aluminum alloys, elemental tin, tin alloys, elemental zinc, and zinc alloys. Elemental aluminum has a melting point of 660°C, aluminum alloys typically have melting points between 550°C and 650°C, elemental tin has a melting point of 232°C, tin alloys typically have melting points around 200°C, elemental zinc has a melting point of 419.5°C, and zinc alloys typically have melting points between 380°C and 390°C. In some examples, the molten metal that can serve as the liquid medium 30 may include molten elemental aluminum or aluminum alloys. Aluminum and aluminum-based alloys have high melting points and boiling points as high as 2300°C, giving the liquid medium 30 a wide temperature range and allowing it to maintain good stability when a preset pressure is applied, ensuring the forming effect of the internal high-pressure forming part.

[0043] In some examples, the liquid inorganic salt that can serve as the liquid medium 30 may include at least one of molten sodium chloride, potassium chloride, calcium chloride, magnesium chloride, and sodium sulfate. Specifically, sodium chloride has a melting point of 800.7°C, potassium chloride has a melting point of 770°C, calcium chloride has a melting point of 840°C, and magnesium chloride has a melting point of 714°C. Using a molten inorganic salt with a melting point higher than that of the workpiece material as the liquid medium 30 allows the liquid medium 30 to provide high temperatures to the workpiece while maintaining good stability.

[0044] In step S200, refer to Figure 2b and Figure 2c After the liquid medium 30 fills the interior of the workpiece 10, the workpiece 10 is sealed so that the liquid medium 30 remains inside the workpiece 10. Subsequently, a preset pressure P is applied to the liquid medium 30. The preset pressure P acts on the liquid medium 30 so that the liquid medium 30 can uniformly transmit the preset pressure P to the inner wall of the workpiece 10, so that the workpiece 10 undergoes plastic deformation under the action of the temperature provided by the liquid medium 30 and the preset pressure P. The outer wall of the workpiece 10 slowly expands and fits into the cavity of the preset mold 20, so that the workpiece 10 forms an internal high-pressure formed part. Exemplarily, the preset pressure P can be applied to the liquid medium 30 by controlling the application component (such as a piston) in equipment that can provide high pressure, such as a hydraulic press, forging press, or die casting machine.

[0045] The preset pressure P can be determined based on the material of the workpiece 10 and the temperature of the liquid medium 30. The preset pressure P is used to induce plastic deformation in the workpiece 10. It is understood that since the temperature of the liquid medium 30 increases the deformability of the workpiece 10, the preset pressure P can be less than the yield strength of the workpiece 10 to induce plastic deformation. However, if the preset pressure P is set too low, the workpiece 10 will not undergo plastic deformation. Since the wall thickness of the workpiece 10 gradually decreases during plastic deformation, if the preset pressure P is set too high, the wall thickness of the workpiece 10 will be excessively thinned under the action of the preset pressure P, or even cracking will occur, leading to defects in the internally pressurized part. In some examples, the preset pressure P applied to the liquid medium 30 can be between 100 MPa and 1000 MPa. In some examples, the preset pressure P can be between 100 MPa and 500 MPa.

[0046] It should be noted that, since the preset pressure P is applied to the liquid medium 30 and transmitted to the workpiece 10 through the liquid medium 30, during the process of plastic deformation of the workpiece 10 to form an internal high-pressure formed part, reference... Figure 2b First, apply a certain pressure to induce plastic deformation in the workpiece 10, causing its shape to essentially conform to the pre-set mold 30. At this point, most of the area except for the corners of the pre-set mold 20 has been formed. Then, refer to... Figure 2c The preset pressure P applied to the liquid medium 30 is increased to shape the workpiece 10, making its shape completely identical to the cavity of the preset mold 20. The outer wall of the workpiece 10 is tightly attached to the corner of the preset mold 30 to form an internal high-pressure formed part of the desired shape and size. Subsequently, the preset pressure P is removed, the mold is opened, and the liquid medium 30 is discharged to obtain the internal high-pressure formed part. That is to say, the preset pressure P applied to the liquid medium 30 is not a fixed value, but a range, and is adjusted as the workpiece 10 undergoes plastic deformation.

[0047] Furthermore, during the application and removal of the preset pressure P, the workpiece 10 undergoes plastic deformation until its shape matches the cavity of the preset mold 20. Therefore, the application time of the preset pressure P only needs to ensure that the workpiece 10 is completely in contact with the preset mold 20. If the preset pressure P is removed too early, the shape of the internal high-pressure formed part formed by the workpiece 10 will not meet expectations. If the application time of the preset pressure P is too long, it is easy for the workpiece 10 to crack. For example, when the internal high-pressure formed part formed by the workpiece 10 includes the middle frame or back shell of an electronic device, since the size of the middle frame and back shell is small, the application time of the preset pressure P can be between 2s and 20s.

[0048] In some examples, after the workpiece 10 is placed in the preset mold 20, a preset mold-closing pressure is applied to the preset mold 20 before the liquid medium 30 is filled into the workpiece 10. The preset mold-closing pressure can prevent the preset mold 20 from shifting position during the forming process of the workpiece 10, ensuring that the shape of the cavity of the preset mold 20 remains unchanged. When a preset pressure P is subsequently applied to the liquid medium 30, the preset mold 20 is prevented from deforming, which would cause the shape of the internal high-pressure formed part to fail to meet expectations. For example, a mold-closing press can be used to apply the preset mold-closing pressure to the preset mold 20.

[0049] In some examples, the preset clamping pressure should be set greater than the preset pressure P so that, during the application of the preset pressure P to the liquid medium 30, the preset mold 20 maintains its preset shape under the action of the preset clamping pressure, without any positional displacement or gaps appearing in the cavity of the preset mold 20. In some examples, the preset clamping pressure should be greater than 1.2 times the preset pressure P to ensure that the cavity shape of the preset mold 20 remains unchanged during the formation of the internal high-pressure forming part of the workpiece 10. In some examples, the preset clamping pressure should be greater than the product of the preset pressure P and the cross-sectional area of ​​the workpiece.

[0050] In an exemplary embodiment, based on the method for manufacturing an internal high-pressure formed part provided in the above embodiments, the method for manufacturing an internal high-pressure formed part further includes:

[0051] In step S101, under the action of the preset mold closing pressure, the liquid medium solidifies to form a solid medium, and an internal high-pressure forming part blank is obtained.

[0052] In step S102, the inner high-pressure forming blank is heated to a preset temperature, so that the solid medium melts to form a liquid medium, and the liquid medium is separated from the workpiece to obtain the inner high-pressure forming part.

[0053] In this embodiment, reference Figure 2c Once the shape of workpiece 10 matches the cavity of the preset mold 20, the preset pressure P applied to the liquid medium 30 needs to be removed. At this time, under the influence of ambient heat dissipation and the preset pressure P, the liquid medium 30 may partially solidify and bond with the inner wall of workpiece 10. Furthermore, due to the material properties of the liquid medium 30, it turns into a solid state after the temperature decreases. If the mold is opened when the liquid medium 30 is in a liquid or semi-solid state, the liquid medium 30 is likely to leak into the interior of the preset mold 20 and solidify, adhering to the cavity of the preset mold 20, affecting the mass production of internal high-pressure formed parts.

[0054] Therefore, after removing the preset pressure P applied to the liquid medium 30, the preset mold closing pressure applied to the preset mold 20 is maintained, so that the shape of the cavity of the preset mold 20 remains unchanged, thereby ensuring that the shape of the workpiece 10 remains unchanged and the liquid medium 30 remains filled inside the workpiece 10. Under the action of the preset mold closing pressure, the liquid medium 30 is allowed to cool and solidify naturally to form a solid medium. Then, the preset mold closing pressure is removed and the mold is opened, and the formed internal high-pressure forming blank is taken out of the mold.

[0055] Since the melting point of workpiece 10 in the internal high-pressure forming blank is greater than the melting point of the solid medium formed by liquid medium 30, the internal high-pressure forming blank is placed in a heating device (such as a furnace) and heated to a preset temperature. The preset temperature can be lower than the melting point of workpiece 10 but higher than the melting point of the solid medium, so that the shape of workpiece 10 remains unchanged, and the solid medium transforms into a molten state at the preset temperature, forming liquid medium 30. Subsequently, workpiece 10 is removed so that liquid medium 30 is separated from workpiece 10, thereby obtaining the internal high-pressure forming part. Liquid medium 30 is recycled or used to continue making internal high-pressure forming parts.

[0056] In the method for manufacturing internally high-pressure formed parts disclosed herein, for workpieces made of high-strength metals that do not readily undergo plastic deformation at room temperature, molten metal or molten inorganic salts are used as the liquid medium during the hydroforming process. This allows the liquid medium to exhibit good stability at high temperatures, and the liquid medium itself possesses a high temperature. When the liquid medium fills the interior of the workpiece, it enhances the workpiece's plastic deformation capacity. Furthermore, the liquid medium maintains good stability during the forming process, even when high pressure is applied, thereby ensuring controllable temperature and pressure during manufacturing and improving the quality and dimensional accuracy of the formed internally high-pressure formed parts.

[0057] In one exemplary embodiment, this disclosure also provides an internal high-pressure formed part, which can be manufactured using the manufacturing method of the internal high-pressure formed part provided in the above embodiments of this disclosure. The internal high-pressure formed part is a lightweight structural component with a hollow structure and a certain shape. Due to the high strength, good quality, and dimensional accuracy of the forming material, the internal high-pressure formed part can be widely used in devices requiring high strength and lightweight design. For example, the internal high-pressure formed part may include exhaust system pipes in a vehicle engine, chassis components such as subframes, longitudinal beams, rear axles, and bumpers in a vehicle engine, and vehicle body structures such as seat frames, dashboard brackets, and roof beams. The internal high-pressure formed part may also include lightweight components in aircraft, such as hollow frame beams, hollow shaft components, and intake / exhaust pipes. The internal high-pressure formed part may also include lightweight components in electronic devices, such as mid-frames and rear shells.

[0058] In some examples, when an internal high-pressure molded component is applied to an electronic device, the internal high-pressure molded component can be a mid-frame. The mid-frame connects the front panel and back cover of the electronic device, making the device a single unit. Using an internal high-pressure molded component as a mid-frame can improve the impact resistance of the electronic device while simultaneously achieving weight reduction.

[0059] In one exemplary embodiment, this disclosure also provides an electronic device, which may include, for example, a mobile phone, tablet computer, watch, vehicle infotainment system, washing machine, floor scrubber, aerospace equipment, etc., and includes the internal high-pressure formed part provided in the above embodiments. Because the internal high-pressure formed part has advantages such as light weight, high strength, good fatigue resistance, and high dimensional accuracy, it is beneficial for achieving lightweighting of electronic devices and enables the electronic devices to have good overall reliability and strength.

[0060] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the following claims.

[0061] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method for manufacturing an internally high-pressure formed part, characterized in that, The method for manufacturing the internal high-pressure forming part includes: The workpiece is placed in a preset mold and a liquid medium is filled into the workpiece, the liquid medium including molten metal or molten inorganic salt; A preset pressure is applied to the liquid medium. Under the action of the temperature of the liquid medium and the preset pressure, the workpiece undergoes plastic deformation until the shape of the workpiece is the same as the cavity of the preset mold, thus obtaining the internal high-pressure formed part. The melting point of the workpiece is greater than the temperature of the liquid medium.

2. The method for manufacturing an internal high-pressure forming part according to claim 1, characterized in that, The molten metal includes at least one of the following: molten elemental aluminum, aluminum alloy, elemental tin, tin alloy, elemental zinc, and zinc alloy.

3. The method for manufacturing an internal high-pressure formed part according to claim 1, characterized in that, The molten inorganic salt includes at least one of molten sodium chloride, potassium chloride, calcium chloride, magnesium chloride, and sodium sulfate.

4. The method for manufacturing an internal high-pressure formed part according to claim 1, characterized in that, The yield strength of the material of the workpiece is >400MPa.

5. The method for manufacturing an internal high-pressure forming part according to claim 1, characterized in that, The materials of the workpiece include titanium alloys, iron-based alloys, or nickel-based alloys.

6. The method for manufacturing an internal high-pressure formed part according to claim 1, characterized in that, The preset pressure is 100MPa-1000MPa.

7. The method for manufacturing an internal high-pressure forming part according to any one of claims 1-6, characterized in that, Before filling the workpiece with a liquid medium, the method for manufacturing the internal high-pressure forming part further includes: A preset mold closing pressure is applied to the preset mold.

8. The method for manufacturing an internal high-pressure formed part according to claim 7, characterized in that, The preset molding pressure is greater than 1.2 times the preset pressure.

9. The method for manufacturing an internal high-pressure formed part according to claim 7, characterized in that, The method for manufacturing the internal high-pressure forming part further includes: Under the preset mold closing pressure, the liquid medium solidifies to form a solid medium, thus obtaining a rough blank of an internally high-pressure forming part; The inner high-pressure forming blank is heated to a preset temperature, causing the solid medium to melt and form the liquid medium. The liquid medium is then separated from the workpiece to obtain the inner high-pressure forming part.

10. An internal high-pressure formed part, characterized in that, The internal high-pressure forming part is formed by the manufacturing method of the internal high-pressure forming part according to any one of claims 1-9.

11. The internal high-pressure forming part according to claim 10, characterized in that, The internal high-pressure forming component includes a middle frame.

12. An electronic device, characterized in that, The electronic device includes the internal high-pressure forming part as described in claim 10 or 11.

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