Device and method for improving ultrahigh pressure performance of additive manufacturing part

Abstract

The invention belongs to the technical field of metallurgical equipment, and particularly relates to an additive manufacturing part ultrahigh pressure performance improving device and method.The additive manufacturing part ultrahigh pressure performance improving device comprises an ultrahigh pressure pump and an ultrahigh pressure container and further comprises a pressure transmission assembly, a pressure relief assembly, a rack assembly and a supporting and positioning assembly. The additive manufacturing part is treated through the ultrahigh liquid pressure in the room temperature environment, high-temperature heating is not needed, energy consumption is greatly reduced, the sealing problem caused by high temperature is avoided, meanwhile, the part is wrapped with the sealing film, liquid can be prevented from entering the part under the ultrahigh pressure, pressure transmission and slight plastic deformation of the part are not affected, and the service life of the part is prolonged. And the boosting process can be accurately controlled, and the liquid pressure is set according to the ultimate mechanical properties of different materials, so that certain plastic deformation of parts is ensured to enhance the bonding tightness between atoms, the mechanical properties are effectively improved, meanwhile, the dimensional precision is not influenced, and the use requirements in the high-end fields such as aerospace are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of metallurgical equipment, and in particular relates to a device and method for improving the ultrahigh pressure performance of additively manufactured parts. Background Art

[0002] Powder metallurgy parts and additively manufactured parts produced by 3D printing are widely used in many industries such as aerospace, shipbuilding, and national defense and military industries. The improvement of their organizational properties and mechanical properties is an important guarantee for promoting the rapid development of the above industries.

[0003] In existing technologies, powder metallurgy and additive manufacturing parts have mechanical properties that are difficult to match those of forged parts commonly used in the aerospace, shipbuilding, and defense industries due to manufacturing process limitations, which limits their application to a certain extent. Hot isostatic pressing (HIP) is often used in industrial production to improve their performance: the parts are placed in a HIP press, heated to 800-2000°C, and pressurized to approximately 200 MPa using air as the medium. This high temperature and high pressure creates a tighter bond within the parts. However, this method has significant drawbacks: high-temperature heating consumes a large amount of energy; compressed air at high temperatures generates high pressure, making sealing difficult and making it difficult to meet the needs of high-end applications. Summary of the Invention

[0004] The purpose of the present invention is to address the above-mentioned problems and provide a device and method for improving the ultra-high pressure performance of additively manufactured parts.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a device for improving the ultrahigh pressure performance of additively manufactured parts, comprising an ultrahigh pressure pump and an ultrahigh pressure container, and further comprising: a pressure transmission assembly, fixedly connected between the ultra-high pressure pump and the ultra-high pressure container, for transmitting the pressure output by the ultra-high pressure pump to the ultra-high pressure container; Pressure relief assembly, used to quickly relieve the liquid pressure in the ultra-high pressure container; Frame assembly, used to withstand the thrust generated by the ultra-high pressure vessel under high pressure; Support and positioning components are used for sealing and stable installation of ultra-high pressure vessels.

[0006] In the above-mentioned device for improving the ultra-high pressure performance of additively manufactured parts, the pressure transmission assembly includes a pressure output pipeline fixedly connected to the output end of the ultra-high pressure pump and an ultra-high pressure connecting pipeline connected to the ultra-high pressure container. The pressure output pipeline and the ultra-high pressure connecting pipeline are connected, and a high-pressure connecting valve is installed on the pressure output pipeline.

[0007] In the above-mentioned device for improving ultra-high pressure performance of additively manufactured parts, the pressure relief assembly includes a medium return pipe connected to the ultra-high pressure connecting pipeline, and a pressure unloading valve is installed on the medium return pipe.

[0008] In the above-mentioned ultra-high pressure performance improvement device for additively manufactured parts, the frame assembly includes an upper pad, a lower pad, a column and a winding steel belt. The column is arranged between the upper pad and the lower pad, and the winding steel belt is tightly wrapped around the upper pad, the column and the lower pad to form a prestressed frame.

[0009] In the above-mentioned ultra-high pressure performance improvement device for additively manufactured parts, the support and positioning assembly includes a support block, an upper head cover, a lower head cover, a movable mold frame and a support, the support block is fixedly connected to the upper end of the lower head cover, the upper head cover and the lower head cover are in close contact with the upper pad and the lower pad respectively, and the upper head cover and the lower head cover are sealed and plugged into the ultra-high pressure container.

[0010] A method for improving ultrahigh pressure performance of additively manufactured parts, comprising the following steps: S1. Preprocessing Wrap the AM part to be processed tightly with a special sealing film to ensure a good seal and prevent liquid from penetrating; S2. Loading The sealed additively manufactured part is placed on the support block inside the ultra-high pressure vessel, and the ultra-high pressure vessel is moved between the upper and lower pads of the frame assembly by moving the mold base, so that the upper head gland and the lower head gland are respectively fitted with the upper and lower pads, and the upper and lower head glands are sealed and connected to the ultra-high pressure vessel; S3. Pressurization The ultra-high pressure pump and pressure transmission assembly are used to input liquid pressure into the ultra-high pressure container, and the pressure is controlled to slowly rise to the set value, so that the additive manufacturing part undergoes a certain degree of plastic deformation without affecting the dimensional accuracy. S4.Pressure maintenance After reaching the set pressure, the pressure is maintained for a period of time to allow the atoms of the additively manufactured part to be fully bonded under the action of ultra-high pressure; S5. Pressure relief and unloading The pressure inside the ultra-high pressure container is released through the pressure relief assembly. After the pressure drops to a safe range, the ultra-high pressure container is removed by moving the mold frame and the processed additive manufacturing parts are taken out.

[0011] In the above-mentioned method for improving the ultra-high pressure performance of an additively manufactured part, the set pressure in S3 is determined according to the ultimate mechanical properties of the additively manufactured part to ensure that the additively manufactured part produces controllable plastic deformation.

[0012] Compared with the existing technology, the beneficial effects of the present invention are: 1. No high-temperature heating is required; the performance of additively manufactured parts can be improved at room temperature, significantly reducing energy consumption and eliminating the need to address sealing difficulties.

[0013] 2. The pressurization process can be precisely controlled. The magnitude of the liquid pressure established is determined according to the ultimate mechanical properties of the different materials being placed. It adapts to the performance requirements of different materials, allowing the additively manufactured parts to produce a certain amount of plastic deformation without affecting their dimensional accuracy. The amount of plastic deformation is very small, meeting the requirements of high-end fields.

[0014] 3. Use a special sealing film to wrap and seal the additive manufacturing parts to ensure that the liquid does not enter the additive manufacturing parts under the action of extremely high liquid pressure. At the same time, the sealing film used will not affect the transmission of extremely high pressure and the slight plastic deformation of the additive manufacturing parts.

[0015] 4. Ultra-high pressure causes controlled plastic deformation of parts, making the atoms of additively manufactured parts more tightly bonded, effectively improving the mechanical properties of additively manufactured parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of an ultra-high pressure performance enhancement device for additively manufactured parts provided by the present invention; Figure 2 yes Figure 1 Schematic diagram of the structure of medium and ultra-high pressure vessel assembly.

[0017] In the figure: 1 ultra-high pressure pump, 2 ultra-high pressure container, 3 pressure output pipeline, 4 ultra-high pressure connecting pipeline, 5 high pressure connecting valve, 6 medium return pipeline, 7 pressure unloading valve, 8 upper pad, 9 lower pad, 10 column, 11 winding steel belt, 12 support block, 13 upper head gland, 14 lower head gland, 15 movable mold frame, 16 support. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] like Figure 1-Figure 2 As shown, an ultrahigh-pressure performance enhancement device for additively manufactured parts includes an ultrahigh-pressure pump 1 and an ultrahigh-pressure container 2. The ultrahigh-pressure pump 1 provides an ultrahigh liquid pressure source with a maximum output pressure exceeding 2000 MPa. The ultrahigh-pressure container 2 is a closed structure for containing the additively manufactured parts to be processed and the liquid medium. The device also includes: A pressure transmission component is fixedly connected between the ultra-high pressure pump 1 and the ultra-high pressure container 2, and is used to transmit the pressure output by the ultra-high pressure pump 1 to the ultra-high pressure container 2; A pressure relief assembly, used to quickly relieve the liquid pressure in the ultra-high pressure container 2; A frame assembly, used to withstand the thrust generated by the ultra-high pressure vessel 2 under high pressure; The supporting and positioning assembly is used for sealing and firmly installing the ultra-high pressure container 2.

[0020] The pressure transmission assembly includes a pressure output pipe 3 fixedly connected to the output end of the ultra-high pressure pump 1 and an ultra-high pressure connecting pipe 4 connected to the ultra-high pressure container 2. The pressure output pipe 3 and the ultra-high pressure connecting pipe 4 are connected, and a high-pressure connecting valve 5 is installed on the pressure output pipe 3.

[0021] The pressure relief assembly includes a medium return pipe 6 connected to the ultra-high pressure connecting pipe 4 , and a pressure unloading valve 7 is installed on the medium return pipe 6 .

[0022] The frame assembly includes an upper pad 8, a lower pad 9, a column 10 and a winding steel belt 11. The column 10 is arranged between the upper pad 8 and the lower pad 9. The winding steel belt 11 is tightly wrapped around the upper pad 8, the column 10 and the lower pad 9 to form a prestressed frame, which is used to withstand the huge thrust generated by the ultra-high pressure container 2 under high pressure and ensure the sealing effect.

[0023] The support and positioning assembly includes a support block 12, an upper head cover 13, a lower head cover 14, a movable mold frame 15 and a support 16. The support block 12 is fixedly connected to the upper end of the lower head cover 14. The support block 12 is used to place the additively manufactured parts to be processed to ensure that the additively manufactured parts are completely immersed in the liquid medium on all sides. The upper head cover 13 and the lower head cover 14 are in close contact with the upper pad 8 and the lower pad 9 respectively, and the upper head cover 13 and the lower head cover 14 are sealed and plugged with the ultra-high pressure container 2 to achieve sealing of the ultra-high pressure container 2. The movable mold frame 15 is used for loading and unloading the ultra-high pressure container 2. The support 16 is fixedly connected to the foundation to achieve stable installation of the entire device.

[0024] The operating principle of the present invention is now described as follows: Wrap the AM part to be processed tightly with a special sealing film to ensure a good seal and prevent liquid from penetrating; Place the sealed additively manufactured part on the support block 12 inside the ultra-high pressure vessel 2, and ensure that there is a gap around the additively manufactured part so that the liquid medium can completely wrap the additively manufactured part. Move the ultra-high pressure vessel 2 between the upper pad 8 and the lower pad 9 of the frame assembly by moving the mold frame 15, so that the upper head gland 13 and the lower head gland 14 are respectively fitted with the upper pad 8 and the lower pad 9, and the upper head gland 13 and the lower head gland 14 are sealed and connected to the ultra-high pressure vessel 2; Liquid pressure is input into the ultra-high pressure container 2 through the ultra-high pressure pump 1 in conjunction with the pressure transmission component. The pressure is controlled to rise to a set value at a rate of 5 MPa / s. The pressure setting value is determined according to the ultimate mechanical properties of the additively manufactured part to ensure that the additively manufactured part produces controllable plastic deformation. After reaching the set pressure, the pressure is maintained for 30 minutes to allow the atoms of the additively manufactured parts to be fully bonded under the ultra-high pressure; Open the pressure relief valve 7 and use the medium return pipe 6 to relieve the pressure in the ultra-high pressure container 2 at a rate of 2 MPa / s to 0 MPa. Then, move the ultra-high pressure container 2 out through the movable mold frame 15, remove the sealing film, and take out the processed additive manufacturing part.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An ultra-high pressure performance enhancement device for additively manufactured parts, comprising an ultra-high pressure pump (1) and an ultra-high pressure container (2), characterized in that: Also includes: a pressure transmission assembly, fixedly connected between the ultra-high pressure pump (1) and the ultra-high pressure container (2), and used for transmitting the pressure output by the ultra-high pressure pump (1) to the ultra-high pressure container (2); A pressure relief assembly for quickly releasing the liquid pressure in the ultra-high pressure container (2); A frame assembly, used to withstand the thrust generated by the ultra-high pressure container (2) under high pressure, and covering the ultra-high pressure container (2); A support and positioning assembly is used for sealing and firmly installing an ultra-high pressure container (2).

2. The ultra-high pressure performance improvement device for additively manufactured parts according to claim 1, characterized in that: The pressure transmission assembly comprises a pressure output pipe (3) fixedly connected to the output end of the ultra-high pressure pump (1) and an ultra-high pressure connecting pipe (4) connected to the ultra-high pressure container (2). The pressure output pipe (3) and the ultra-high pressure connecting pipe (4) are connected, and a high-pressure connecting valve (5) is installed on the pressure output pipe (3).

3. The device for improving ultrahigh pressure performance of additively manufactured parts according to claim 2, characterized in that: The pressure relief assembly comprises a medium return pipe (6) connected to the ultra-high pressure connecting pipe (4), and a pressure relief valve (7) is installed on the medium return pipe (6).

4. The device for improving ultrahigh pressure performance of additively manufactured parts according to claim 3, characterized in that: The frame assembly comprises an upper pad (8), a lower pad (9), a column (10) and a winding steel belt (11), wherein the column (10) is arranged between the upper pad (8) and the lower pad (9), and the winding steel belt (11) is tightly wound around the upper pad (8), the column (10) and the lower pad (9) in a circumferential direction to form a frame with prestress.

5. The ultra-high pressure performance improvement device for additively manufactured parts according to claim 4, characterized in that: The support and positioning assembly comprises a support block (12), an upper head gland (13), a lower head gland (14), a movable mold frame (15) and a support (16); the support block (12) is fixedly connected to the upper end of the lower head gland (14); the upper head gland (13) and the lower head gland (14) are in close contact with the upper pad (8) and the lower pad (9) respectively; and the upper head gland (13) and the lower head gland (14) are sealed and plugged with the ultra-high pressure container (2).

6. A method for improving the ultrahigh pressure performance of additively manufactured parts, which uses the ultrahigh pressure performance improvement device for additively manufactured parts according to claim 5, characterized in that: The steps include: S1. Preprocessing Wrap the AM part to be processed tightly with a sealing film to ensure a good seal and prevent liquid from penetrating; S2. Loading The sealed additively manufactured part is placed on the support block (12) in the ultra-high pressure container (2), and the ultra-high pressure container (2) is moved between the upper pad (8) and the lower pad (9) of the frame assembly by moving the mold frame (15), so that the upper head cover (13) and the lower head cover (14) are respectively fitted with the upper pad (8) and the lower pad (9), and the upper head cover (13) and the lower head cover (14) are sealed and connected to the ultra-high pressure container (2); S3. Pressurization Liquid pressure is input into the ultra-high pressure container (2) through an ultra-high pressure pump (1) in conjunction with a pressure transmission component, and the pressure is controlled to slowly rise to a set value, so that the additively manufactured part undergoes a certain plastic deformation without affecting the dimensional accuracy; S4.Pressure maintenance After reaching the set pressure, the pressure is maintained for a period of time to allow the atoms of the additively manufactured part to be fully bonded under the action of ultra-high pressure; S5. Pressure relief and unloading The pressure in the ultra-high pressure container (2) is released by the pressure relief assembly. After the pressure drops to a safe range, the ultra-high pressure container (2) is removed by moving the mold frame (15) and the processed additive manufacturing part is taken out.

7. The method for improving ultrahigh pressure performance of additively manufactured parts according to claim 6, characterized in that: The set pressure in S3 is determined according to the ultimate mechanical properties of the additively manufactured part to ensure that the additively manufactured part produces controllable plastic deformation.

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