A parallel double-branch magnetorheological fluid high pressure forming device and its use method

Abstract

The present invention relates to a parallel double-branched tube magnetorheological fluid internal high pressure forming device and its use method, comprising a detachably connected upper die and a lower die, the upper die is provided with two grooves, and the upper die cooperates with the lower die to form a forming die adapted to the parallel double-branched tube; a plurality of coils are respectively provided around the main tube and the branch tube of the parallel double-branched tube in the upper die and the lower die, and the plurality of coils are respectively electrically connected to a DC power supply, and a left punch and a right punch are respectively provided at the two ends of the corresponding main tube between the upper die and the lower die, and the left punch and the right punch cooperate with the tube to be processed to form a closed space for filling with magnetorheological fluid. The present invention adopts magnetorheological fluid as a force transmission medium to perform internal high pressure forming of the parallel double-branched tube, utilizes the characteristic of magnetorheological fluid being sensitive to magnetic field, and adopts a method of regulating magnetic field strength for different regions of the parallel double-branched tube, so as to realize accurate control of the bulging force in different regions of the tube, and effectively reduce the friction force in the main tube region.

Description

Technical Field

[0001] The present invention relates to the technical field of parallel double-branch tube internal high pressure forming, and more specifically, to a parallel double-branch tube magnetorheological fluid internal high pressure forming device and a use method thereof. Background Art

[0002] Parallel double-branch pipes are widely used in pipeline systems in the fields of ships, home appliances, etc. At present, in order to ensure the quality and use requirements of pipe fittings, the internal high pressure forming process is usually used to realize the overall forming of pipe fittings. Under the joint action of axial compression and internal pressure, the pipe fittings are formed into the required shape. However, compared with the three-way pipe, the parallel double-branch pipe has a complex shape. A single branch pipe is only subjected to unilateral axial compression and filling. The internal pressure is evenly applied to each area, resulting in the same friction force in each area. The degree of deformation of each area is affected by the structure of the parts and varies greatly. Therefore, under the action of a single force field, the local difficult-to-form area does not receive enough filling, resulting in premature rupture of the pipe fittings, affecting the forming quality, and it is difficult to obtain a parallel double-branch pipe with uniform wall thickness and high branch height. Therefore, it is of great engineering significance to study a method that can realize the adjustable internal pressure in multiple areas of the pipe, improve the distribution of friction in the pipe forming process, and promote the flow of materials to the local difficult-to-form area to obtain high-quality parallel double-branch pipes. Summary of the invention

[0003] In view of the shortcomings of the prior art, one of the purposes of the present invention is to provide a parallel double-branch magnetorheological fluid internal high pressure forming device. The device uses magnetorheological fluid as a force transmission medium to perform internal high pressure forming of the parallel double-branch. By utilizing the magnetorheological fluid's sensitivity to the magnetic field, the magnetic field strength is regulated in different areas of the parallel double-branch to achieve precise control of the expansion force in different areas of the pipe, effectively reducing the friction in the main pipe area, so that more main pipe material flows to the branch pipe, and at the same time, sufficient expansion force can be provided for the expansion area. The second purpose of the present invention is to provide a method for using the parallel double-branch magnetorheological fluid internal high pressure forming device. The method uses magnetorheological fluid as a force transmission body, and by regulating the magnetic field strength in different areas, precise pressure regulation in different areas is achieved, the friction in the pipe forming process is improved, the main pipe material is promoted to flow to the branch pipe, and the branch pipe height is increased to form a parallel double branch.

[0004] The above technical purpose of the present invention is achieved through the following technical solutions: a parallel double-branch magnetorheological fluid high-pressure forming device, including a detachably connected upper die and a lower die, the upper die is provided with two grooves, and the upper die cooperates with the lower die to form a forming die compatible with the parallel double-branch; the upper die and the lower die are respectively provided with a plurality of coils surrounding the main tube and the branch tube of the parallel double-branch, and the plurality of coils are respectively electrically connected to a DC power supply, and a left punch and a right punch are respectively provided at the two ends of the corresponding main tube between the upper die and the lower die, and the left punch and the right punch cooperate with the tube to be processed to form a closed space for filling with magnetorheological fluid.

[0005] In one embodiment, the coil includes a first coil located in the upper mold and a second coil located in the lower mold, and the first coil and the second coil correspond to each other one by one.

[0006] In one embodiment, there are five first coils, and two of the first coils correspond to the top ends of the two branch pipes respectively, and the other three first coils are located on the sides of the two branch pipes.

[0007] In one of the embodiments, three first coils located on the sides of the two branch pipes in the upper mold are respectively provided with through grooves, and the through grooves are used to place the first coils of different heights according to the height requirements of the branch pipes.

[0008] In one embodiment, the second coils are evenly distributed along the extension direction of the main pipe.

[0009] In one embodiment, the left punch and the right punch are both piston-shaped, and the left punch and the right punch are interference fit with both ends of the through hole formed by the forming die.

[0010] In one embodiment, a sealing ring is provided between the left punch, the right punch and the end of the main pipe.

[0011] A method for using a parallel double-branch magnetorheological fluid high pressure forming device comprises the following steps:

[0012] S1. According to the needs of forming the parallel double-branch pipe, a plurality of the coils are installed in the upper die and the lower die, and the pipe to be processed is placed in the forming die formed by the upper die and the lower die;

[0013] S2, filling the pipe with magnetorheological fluid, and installing the left punch and the right punch at both ends of the pipe to form a seal;

[0014] S3, according to the forming characteristics of the tube, inputting currents of different magnitudes into the plurality of coils, so that the magnetorheological fluid in the tube presents different force transmission moduli;

[0015] S4, applying pressure to the left punch and the right punch, so that the magnetorheological fluid in the pipe is compressed to generate a bulging force, and the parallel double-branch pipe forming is completed under the action of the axial pressure and the bulging force generated by the magnetorheological fluid itself;

[0016] S5, turning off the power supply, opening the upper die, and taking out the formed parallel double branch pipes.

[0017] In one of the embodiments, in the step S2, the left punch is installed first, and then the right punch is installed after the magnetorheological fluid is filled, and then the left punch and the right punch are pressed inward.

[0018] In one of the embodiments, in step S4, the pressure applied to the left punch and the right punch is axial pressure, and the directions of the two pressures are on the same horizontal line.

[0019] In summary, the present invention has the following beneficial effects:

[0020] 1. The device of the present invention uses magnetorheological fluid as a force transmission medium to perform internal high pressure forming of parallel double branches. By utilizing the magnetorheological fluid's sensitivity to magnetic fields, the magnetic field intensity is regulated in different areas of the parallel double branches to achieve precise control of the expansion force in different areas of the pipe, effectively reducing the friction force in the main pipe area, allowing more main pipe material to flow to the branch pipe, and at the same time providing sufficient expansion force for the expansion area.

[0021] 2. The first coil and the second coil are arranged correspondingly and can be connected correspondingly to form a plurality of coils surrounding the parallel double branch pipes, so that the current conditions at the same position can be adjusted correspondingly at the same time, thereby providing different magnetic field strengths for the corresponding positions.

[0022] 3. The left punch and the right punch are interference fit with both ends of the through hole formed by the forming die to block the corresponding ends to prevent the magnetorheological fluid from flowing out. The sealing ring further forms a sealed space to prevent the magnetorheological fluid from overflowing, especially the shape change during the compression process, to avoid the magnetorheological fluid volume reduction affecting the forming quality.

[0023] 4. The method of the present invention is an application method of the device, which uses magnetorheological fluid as a force transmission medium, and achieves precise pressure control in different areas by adjusting the magnetic field strength in different areas, improves the friction force in the pipe forming process, promotes the flow of main pipe material to the branch pipe, and increases the height of the branch pipe to form a parallel double branch pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of parallel double branches;

[0025] Figure 2It is a structural schematic diagram of a parallel double-branch magnetorheological fluid high pressure forming device of the present invention;

[0026] Figure 3 It is a schematic diagram of the forming process of a parallel double-branch magnetorheological fluid internal high-pressure forming device of the present invention.

[0027] In the figure: 1-upper die, 2-lower die, 3-left punch, 4-right punch, 5-coil, 6-magnetorheological fluid, 7-main pipe, 8-branch pipe. DETAILED DESCRIPTION

[0028] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] It is worth noting that the directional words such as "upper" and "lower" involved in this article are all relative to the viewing angle of the drawings and are only for the convenience of description and cannot be understood as limitations on the technical solution.

[0030] like Figure 2-3 As shown, a parallel double-branch magnetorheological fluid internal high pressure forming device comprises a detachably connected upper die 1 and a lower die 2, the upper die 1 is provided with two grooves, and the upper die 1 cooperates with the lower die 2 to form a forming die adapted to the parallel double-branch; a plurality of coils 5 are respectively provided around the main tube 7 and the branch tube 8 of the parallel double-branch in the upper die 1 and the lower die 2, and the plurality of coils 5 are respectively electrically connected to a DC power supply, and a left punch 3 and a right punch 4 are respectively provided at the two ends of the corresponding main tube 7 between the upper die 1 and the lower die 2, and the left punch 3 and the right punch 4 cooperate with the pipe to be processed to form a closed space for filling with magnetorheological fluid 6. The device of the present invention uses magnetorheological fluid 6 as a force transmission medium to perform internal high pressure forming of the parallel double-branch, and utilizes the characteristic of magnetorheological fluid 6 being sensitive to magnetic field, and adopts a magnetic field strength control method for different regions of the parallel double-branch to achieve accurate control of the bulging force of different regions of the pipe, effectively reducing the friction force in the main tube 7 region, so that more material of the main tube 7 flows to the branch tube 8, and at the same time, sufficient bulging force can be provided for the bulging area.

[0031] like Figure 1As shown, after the parallel double-branch tube is formed, it includes a main tube 7 and two branch tubes 8 protruding above the main tube 7. To process into this shape, the tube is usually placed in a forming mold, and the two ends are squeezed to deform the tube in the mold, thereby forming the shape of the parallel double-branch tube. However, since the tube is generally a straight tube, to form the shape of the two protruding branch tubes 8 of the parallel double-branch tube, the guidance of internal pressure is required to make the formed parallel double-branch tube wall uniform. This requires that different internal high pressures should be formed for the parallel double-branch tubes at different parts during the forming process, so as to avoid uneven force in some parts during the forming process and rupture, or part of the material in the tube is accumulated at a low pressure, affecting the forming quality of the parallel double-branch tube. Therefore, the device utilizes the characteristics of the magnetorheological fluid 6, and sets a plurality of coils 5. By passing different currents into the coils 5, different magnetic field strengths are generated, and the expansion force of different areas of the tube is precisely controlled. In this way, parallel double-branch tubes of different shapes and requirements can be formed, and different current strengths of each coil can be changed to form parallel double-branch tubes of different sizes.

[0032] In one embodiment, the coil 5 includes a first coil located in the upper mold 1 and a second coil located in the lower mold 2, and the first coil and the second coil correspond to each other. The first coil and the second coil are arranged correspondingly and can be connected correspondingly to form a plurality of coils 5 surrounding the parallel double branch pipes, so that the current conditions at the same position can be adjusted simultaneously and correspondingly, thereby providing different magnetic field strengths for the corresponding positions.

[0033] In one embodiment, there are five first coils, and two of them correspond to the tops of the two branches 8, and the other three are located on the sides of the two branches 8. The arrangement of five first coils is sufficient to form a generally shaped parallel double branch, two of which are located at the top of the branch 8, and cooperate with the three first coils located on the side, so as to guide the shape of the branch 8. The three first coils corresponding to the sides of the two branches 8 in the upper mold 1 are respectively provided with through grooves, and the through grooves are used to place first coils of different heights according to the height requirements of the branch 8. In order to form parallel double branches with different branch 8 height shapes, first coils of different heights can be set through the through grooves to provide currents at different height positions, so that the expansion force of the magnetorheological fluid 6 reaches the corresponding position.

[0034] In one embodiment, the second coils are evenly distributed along the extension direction of the main tube 7 , which are arranged corresponding to the first coils and can better form a uniform bottom of the main tube 7 .

[0035] In one embodiment, the left punch 3 and the right punch 4 are both piston-shaped, and the left punch 3 and the right punch 4 are interference fit with both ends of the through hole formed by the forming mold to block the corresponding ends to prevent the magnetorheological fluid 6 from flowing out. A sealing ring is provided between the left punch 3 and the right punch 4 and the end of the main pipe 7. The sealing ring further forms a sealed space to prevent the magnetorheological fluid 6 from overflowing, especially the shape change during the compression process, to avoid the magnetorheological fluid 6 from becoming smaller in volume and affecting the forming quality.

[0036] A method for using a parallel double-branch magnetorheological fluid high pressure forming device comprises the following steps:

[0037] S1. According to the needs of forming the parallel double-branch pipe, multiple coils 5 are installed in the upper mold 1 and the lower mold 2, and the pipe to be processed is placed in the forming mold formed by the upper mold 1 and the lower mold 2;

[0038] S2, fill the tube with magnetorheological fluid 6, and install the left punch 3 and the right punch 4 at both ends of the tube to form a seal;

[0039] S3, according to the forming characteristics of the tube, inputting currents of different magnitudes into the multiple coils 5, so that the magnetorheological fluid 6 in the tube presents different force transmission moduli;

[0040] S4, applying pressure to the left punch 3 and the right punch 4, so that the magnetorheological fluid 6 in the tube is compressed to generate a bulging force, and the parallel double-branch tube forming is completed under the action of the axial pressure and the bulging force generated by the magnetorheological fluid 6 itself;

[0041] S5. Turn off the power, open the upper mold 1, and take out the formed parallel double branch pipes.

[0042] The method of the present invention is an application method of the device, which uses magnetorheological fluid 6 as a force transmission medium, and achieves precise pressure control in different areas by adjusting the magnetic field strength in different areas, improves the friction force in the pipe forming process, promotes the flow of main pipe material to branch pipe, and increases the height of branch pipe to form parallel double branches. It is a forming process that is easy to operate and easy to realize parallel double branches.

[0043] In one of the embodiments, in step S2, the left punch 3 is installed first, and the right punch 4 is installed after the magnetorheological fluid 6 is filled, and then the left punch 3 and the right punch 4 are pressed inward. This method can ensure that the magnetorheological fluid 6 is filled in the pipe, and prevent the entry of air and affect its processing effect. In step S4, the pressure on the left punch 3 and the right punch 4 is axial pressure, and the directions of the two pressures are on the same horizontal line. Ensure that the force directions of the left punch 3 and the right punch 4 are consistent to avoid abnormal conditions such as skewed forming caused by misalignment or uneven force.

[0044] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A parallel double-branch magnetorheological fluid high pressure forming device, characterized in that: The invention comprises an upper die (1) and a lower die (2) which are detachably connected, the upper die (1) being provided with two grooves, and the upper die (1) and the lower die (2) being cooperated to form a forming die adapted to the parallel double branch pipes (8); a plurality of coils (5) are respectively provided in the upper die (1) and the lower die (2) around the main pipe (7) and the branch pipes (8) of the parallel double branch pipes (8), and the plurality of coils (5) are respectively electrically connected to a direct current power supply; a left punch (3) and a right punch (4) are respectively provided at the two ends of the corresponding main pipe (7) between the upper die (1) and the lower die (2), and the left punch (3) and the right punch (4) are cooperated with the pipe to be processed to form a closed space for filling with magnetorheological fluid (6); The coil (5) comprises a first coil located in the upper mold (1) and a second coil located in the lower mold (2), the second coils being evenly distributed along the extension direction of the main pipe (7), the first coils and the second coils corresponding one to one, there being five first coils, two of which correspond to the top ends of two branch pipes (8), respectively, and the other three first coils being located on the sides of the two branch pipes (8); The upper mold (1) is provided with through slots corresponding to the three first coils located on the sides of the two branch pipes (8), and the through slots are used to place the first coils of different heights according to the height requirements of the branch pipes (8); The left punch (3) and the right punch (4) are both piston-shaped, and the left punch (3) and the right punch (4) are interference-fitted with the two ends of the through hole formed by the forming die, and sealing rings are provided between the left punch (3) and the right punch (4) and the end of the main pipe (7).

2. A method for using the parallel double-branch magnetorheological fluid high pressure forming device as claimed in claim 1, characterized in that: The steps include: S1. According to the need for forming the parallel double-branch pipe (8), a plurality of the coils (5) are installed in the upper die (1) and the lower die (2), and the pipe to be processed is placed in a forming die formed by the upper die (1) and the lower die (2); S2, filling the pipe with magnetorheological fluid (6), and installing the left punch (3) and the right punch (4) at both ends of the pipe to form a seal; S3, according to the forming characteristics of the tube, inputting currents of different magnitudes into the plurality of coils (5), so that the magnetorheological fluid (6) in the tube exhibits different force transmission moduli; S4, applying pressure to the left punch (3) and the right punch (4), so that the magnetorheological fluid (6) in the tube is compressed to generate a bulging force, and the parallel double-branch tube (8) is formed under the action of the axial pressure and the bulging force generated by the magnetorheological fluid (6) itself; S5, turning off the power supply, opening the upper mold (1), and taking out the formed parallel double branch pipe (8).

3. The method for using the parallel double-branch magnetorheological fluid high pressure forming device as claimed in claim 2, characterized in that: In step S2, the left punch (3) is first installed, and then the right punch (4) is installed after the magnetorheological fluid (6) is filled, and then the left punch (3) and the right punch (4) are pressed inwards.

4. The method for using the parallel double-branch magnetorheological fluid high pressure forming device as claimed in claim 3, characterized in that: In step S4, the pressure applied to the left punch (3) and the right punch (4) is axial pressure, and the directions of the two pressures are on the same horizontal line.

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